Fire storage system and control method, device and medium thereof

Abstract

The application provides a fire storage system and a control method, device and medium thereof, and relates to the technical field of power systems. The control method of the fire storage system comprises the following steps: acquiring a current operation mode of the fire storage system; the operation mode comprises a peak regulation mode and a frequency regulation mode; when a fire storage system operation mode switching instruction is acquired, the current power change direction of the thermal power generating unit in the current operation mode and the to-be-regulated power change direction of the thermal power generating unit in the to-be-switched operation mode are acquired; when the current power change direction is the same as the to-be-regulated power change direction, the fire storage system is controlled to operate in the frequency regulation mode. Through the coordinated control of the peak regulation mode and the frequency regulation mode of the fire storage system, the economic benefits are guaranteed and the power supply demand of the power grid is met.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of power system technology, and in particular to a fire storage system and its control method, device and medium. Background Technology

[0002] Thermal power units, as an important component of traditional power systems, are widely used to meet the baseload supply and regulation needs of the power grid. With the increasing penetration of new energy sources and the advancement of electricity marketization, thermal power units need to have more flexible operating capabilities to adapt to the requirements of grid stability.

[0003] In existing technologies, to compensate for the slow response of thermal power units due to the large delay and inertia of the boiler system, electrochemical energy storage devices are often introduced to operate in conjunction with the thermal power units. The rapid charging and discharging characteristics of the energy storage devices assist the operation of the thermal power units, thereby improving the peak-shaving and frequency regulation capabilities of the thermal power units.

[0004] However, the control strategies of existing thermal power storage systems are typically designed for a single operating condition of peak shaving or frequency regulation, failing to achieve simultaneous coordinated operation of peak shaving and frequency regulation tasks. For example, when a thermal power storage system faces both peak shaving and frequency regulation demands, the lack of a unified control strategy prevents the system from optimizing resource allocation based on comprehensive benefits. This singular control approach limits the adaptability and economy of thermal power storage systems under complex operating conditions. Summary of the Invention

[0005] This invention provides a thermal energy storage system and its control method, device and medium, which coordinates the peak-shaving mode and frequency regulation mode of the thermal energy storage system to meet the power supply demand of the power grid while ensuring economic benefits.

[0006] The first aspect of this invention provides a control method for a thermal power generation and energy storage system, the thermal power generation and energy storage system including a thermal power unit and an energy storage device, the control method of the thermal power generation and energy storage system including:

[0007] Obtain the current operating mode of the fire storage system; the operating mode includes peak shaving mode and frequency regulation mode;

[0008] When the operating mode switching command of the thermal power storage system is obtained, the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched are obtained.

[0009] When the current power change direction is the same as the power change direction to be adjusted, the fire storage system is controlled to operate in the frequency regulation mode.

[0010] Optionally, the control method for the fire storage system also includes:

[0011] When the current power change direction is different from the power change direction to be adjusted, obtain the comprehensive peak-shaving benefit under the peak-shaving mode and the comprehensive frequency-modulation benefit under the frequency-modulation mode.

[0012] When the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency regulation benefit, the fire storage system is controlled to operate in the frequency regulation mode.

[0013] Optionally, the control method for the fire storage system also includes:

[0014] When the overall peak-shaving benefit is greater than the overall frequency regulation benefit, the fire storage system is controlled to operate in the peak-shaving mode.

[0015] Optionally, the power change direction in the peak-shaving mode includes a forward peak-shaving power change direction and a reverse peak-shaving power change direction; the forward peak-shaving power change direction is the direction of change from the valley price range of the grid to the peak price range; the reverse peak-shaving power change direction is the direction of change from the peak price range of the grid to the valley price range.

[0016] The power change direction in the frequency regulation mode includes a forward frequency regulation power change direction and a reverse frequency regulation power change direction; the forward frequency regulation power change direction is the power change direction when the power demand of the power grid is greater than the load power of the thermal power unit; the reverse frequency regulation power change direction is the power change direction when the power demand of the power grid is less than the load power of the thermal power unit.

[0017] Optionally, the control method for the fire storage system also includes:

[0018] In the peak-shaving mode, the peak-shaving parameters of the fire storage system are acquired in real time;

[0019] The power generation of the thermal power unit and the charging and discharging power of the energy storage device are controlled according to the peak-shaving parameters.

[0020] Optionally, the peak-shaving parameters include the mains electricity price and the charging / discharging benchmark value;

[0021] Controlling the power generation of the thermal power unit and the charging and discharging power of the energy storage device according to the peak-shaving parameters includes:

[0022] Based on the aforementioned mains electricity price and charging / discharging benchmark values, a peak-shaving charging / discharging function is constructed;

[0023] The charging and discharging power of the energy storage device is controlled according to the peak-shaving charging and discharging function;

[0024] The power generation of the thermal power unit is controlled based on the charging and discharging power of the energy storage device and the winning bid power of the thermal power storage system.

[0025] Optionally, the peak-shaving charge / discharge function includes a peak-shaving charge function and a peak-shaving discharge function:

[0026] The peak-shaving charging function is:

[0027]

[0028] Among them, P 充 The current charging power of the energy storage device is given by , x is the real-time electricity price of the power grid, Pn is the rated charging and discharging power of the energy storage device, k1 and C1 are both charging coefficients, and b is the charging benchmark electricity price.

[0029] The peak-shaving discharge function is:

[0030]

[0031] Among them, P 放 Let x be the current discharge power of the energy storage device, x be the real-time electricity price of the power grid, Pn be the rated charging and discharging power of the energy storage device, k2 and C2 be discharge coefficients, and c be the discharge benchmark electricity price.

[0032] Optionally, before the fire storage system enters the peak-shaving mode, it further includes:

[0033] Obtain the winning bid power of the thermal energy storage system and the economic range of the power generation power of the thermal energy storage system;

[0034] When the winning bid power is within the economic range of the power generation, the operating status information of the energy storage device is obtained;

[0035] When it is determined that the energy storage device meets the conditions for commissioning based on the operating condition information of the energy storage device, the fire storage system is controlled to enter the peak shaving mode.

[0036] Optionally, the control method for the fire storage system also includes:

[0037] If the awarded power is not within the economic range of the power generation capacity, or if the energy storage device does not meet the conditions for commissioning according to the operating condition system of the energy storage device, the energy storage device is controlled to be in standby mode, and the thermal power unit is controlled to generate electricity at the awarded power.

[0038] Optionally, the lower limit of the economic power generation range of the thermal energy storage system is P. min The upper limit of power is P max ;in:

[0039] P min =MAX{P Gmin -P ec P Gmin -Pallow1};

[0040] P max =MIN{P Gmax +P ed P Gmax +P allow2};

[0041] Among them, P Gmin P represents the minimum generating capacity of the thermal power unit. Gmax P represents the maximum generating capacity of the thermal power unit. ec P is the rated charging power of the energy storage device. ed P is the rated discharge power of the energy storage device. allow1 P represents the lower limit of the permissible power generation capacity of the thermal energy storage system. allow2 This represents the upper limit of the allowable power generation capacity of the fire-storage system.

[0042] Optionally, the control method for the fire storage system also includes:

[0043] In the frequency modulation mode, the frequency modulation parameters of the fire storage system are acquired in real time;

[0044] The power generation of the thermal power unit and the charging and discharging power of the energy storage device are controlled according to the frequency regulation parameters.

[0045] Optionally, the frequency regulation parameters include the grid demand power, the load power of the thermal power unit, and the dead zone power threshold of the thermal power unit;

[0046] Controlling the power generation of the thermal power unit and the charging and discharging power of the energy storage device according to the frequency regulation parameters includes:

[0047] Based on the power demand of the power grid, the initial load power of the thermal power unit, the current load power of the thermal power unit, and the dead zone power threshold, a frequency regulation charging and discharging formula is constructed.

[0048] The charging and discharging power of the energy storage device and the power generation power of the thermal power unit are controlled according to the frequency regulation charging and discharging formula.

[0049] Optionally, a frequency-regulating charging and discharging formula is constructed based on the grid demand power, the initial load power, the current load power, and the dead-zone power threshold, including:

[0050] The frequency regulation stage of the thermal power unit is determined based on the power demand of the power grid, the initial load power, the current load power, and the dead zone power threshold; the frequency regulation stage includes a response stage, a ramp-up stage, and a steady-state stage.

[0051] Based on the current frequency regulation stage of the thermal power unit, determine the current frequency regulation charging and discharging formula;

[0052] During the response phase, the frequency-modulated charging and discharging formula is as follows:

[0053]

[0054] During the climbing phase, the frequency-modulated charging and discharging formula is as follows:

[0055]

[0056] During the steady-state phase, the frequency-modulated charging and discharging formula is as follows:

[0057]

[0058] Among them, P Be1 P represents the charging and discharging power of the energy storage device during the response phase. Be2 P represents the charging and discharging power of the energy storage device during the ramp-up phase. Be3 P represents the charging and discharging power of the energy storage device during the steady-state phase. AGC P represents the power demand of the power grid. G0 For the initial load power, P G P represents the current load power. D The dead zone power threshold is defined as follows.

[0059] Optionally, the control method for the fire storage system also includes:

[0060] When controlling the energy storage device to charge and discharge, the remaining power of the energy storage device and the rated charging and discharging power of the energy storage device are obtained in real time.

[0061] The current charging and discharging power of the energy storage device is controlled based on the current remaining power of the energy storage device and the rated charging and discharging power.

[0062] A second aspect of the present invention provides a control device for a thermal power generation and energy storage system, the thermal power generation and energy storage system comprising a thermal power unit and an energy storage device, the control device comprising:

[0063] The operation mode acquisition module is used to acquire the current operation mode of the fire storage system; the operation mode includes peak shaving mode and frequency regulation mode.

[0064] The power change direction acquisition module is used to acquire the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched when the thermal power storage system operation mode switching instruction is received.

[0065] The operation mode switching module is used to control the fire storage system to operate in the frequency regulation mode when the current power change direction is the same as the power change direction to be adjusted.

[0066] A third aspect of the present invention provides a thermal power unit and an energy storage system, comprising: a thermal power unit, an energy storage device, and a controller;

[0067] The controller is connected to both the thermal power unit and the energy storage device, and is used to execute the control method of the thermal power storage system as described above.

[0068] A fourth aspect of the present invention provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer instructions, the computer instructions being used to cause a processor to execute and implement the control method of the fire storage system as described above.

[0069] The technical solution of this invention includes two operating modes for the thermal power-storage system: peak-shaving mode and frequency regulation mode. In peak-shaving mode, based on the grid electricity price and charging / discharging benchmark values, the power generation of the thermal power unit and the charging / discharging power of the energy storage device are controlled. This allows the thermal power-storage system to reduce losses and store energy during low electricity prices, and to discharge energy during high electricity prices, thereby increasing revenue. This maximizes the utilization of the peak-valley price difference. Simultaneously, the rapid charging / discharging capability of the energy storage device compensates for the slow adjustment of the thermal power unit, enabling the thermal power-storage system to respond more flexibly to changes in grid electricity prices. In frequency regulation mode, based on the grid demand power and the real-time load power of the thermal power unit, the power generation of the thermal power unit and the charging / discharging power of the energy storage device are controlled. This allows the combined power of the thermal power-storage system to quickly match the grid demand power, maintaining stable grid frequency operation. Furthermore, by acquiring the current operating mode of the thermal power-storage system, it is possible to determine which mode the system is currently operating in, thereby executing corresponding control strategies to meet the grid's demands and ensure the system's economic viability. Simultaneously, upon receiving a command to switch the thermal power-storage system's operating mode, the system acquires the current power change direction of the thermal power unit under the current operating mode and the direction of the power change to be adjusted under the new operating mode. When the current power change direction and the direction of the power change to be adjusted are the same, the thermal power-storage system is controlled to operate in frequency regulation mode. This ensures that when the frequency regulation mode and peak shaving mode aim to adjust the power generation of the thermal power unit in the same direction, the thermal power-storage system is prioritized to operate in frequency regulation mode, guaranteeing that the combined power of the thermal power-storage system can meet the real-time power supply demands of the grid, thus improving the accuracy of regulating the power generation of the thermal power unit and the charging and discharging power of the energy storage device. The technical solution of this invention, through the coordinated control of the integrated peak shaving mode and frequency regulation mode of the thermal power-storage system, achieves both economic benefits and meets the grid's power supply demands.

[0070] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0071] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0072] Figure 1 This is a schematic diagram of a fire storage system provided in Embodiment 1 of the present invention;

[0073] Figure 2 This is a flowchart illustrating a control method for a fire storage system provided in Embodiment 2 of the present invention;

[0074] Figure 3 This is a flowchart illustrating a control method for a fire storage system provided in Embodiment 3 of the present invention;

[0075] Figure 4 This is a flowchart illustrating a control method for a fire storage system under peak-shaving mode provided in Embodiment 4 of the present invention.

[0076] Figure 5 This is a schematic diagram of the peak-shaving charging function of an energy storage device provided in Embodiment 4 of the present invention;

[0077] Figure 6 This is a schematic diagram of the peak-shaving discharge function of an energy storage device provided in Embodiment 4 of the present invention;

[0078] Figure 7 This is a flowchart illustrating a control method for a fire storage system under peak-shaving mode provided in Embodiment 5 of the present invention.

[0079] Figure 8 This is a flowchart illustrating a control method for a thermal energy storage system under frequency modulation mode, provided in Embodiment Six of the present invention.

[0080] Figure 9 This is a schematic diagram of the frequency modulation command response process of a fire storage system provided in Embodiment Six of the present invention;

[0081] Figure 10 This is a flowchart illustrating a control method for a fire storage system provided in Embodiment 7 of the present invention;

[0082] Figure 11 This is a schematic diagram of the charging and discharging power limiting function of an energy storage device provided in Embodiment 7 of the present invention;

[0083] Figure 12 This is a schematic diagram of the structure of a control device for a fire storage system provided in Embodiment 8 of the present invention;

[0084] Figure 13 This is a schematic diagram of the structure of a controller for a fire storage system provided in Embodiment 9 of the present invention. Detailed Implementation

[0085] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0086] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0087] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0088] Example 1

[0089] Figure 1 This is a structural schematic diagram of a fire storage system provided in Embodiment 1 of the present invention, as shown below. Figure 1 As shown, the thermal power unit includes: thermal power unit 1, energy storage device 2 and controller 3; controller 3 is connected to thermal power unit 1 and energy storage device 2 respectively.

[0090] Specifically, thermal power unit 1 can be understood as the main power generation unit in the thermal power-storage system. Thermal power unit 1 can utilize coal, natural gas, or other fuels as energy sources and convert thermal energy into electrical energy through equipment such as boilers, steam turbines, and generators. This provides a stable base load power and a certain degree of regulation capability to meet the basic power supply needs of the power grid. Simultaneously, thermal power unit 1 can adjust its power generation capacity through peak shaving or frequency regulation to meet changes in the power grid's supply demand. However, the response speed of thermal power unit 1 is relatively slow, making it difficult to meet instantaneous regulation requirements.

[0091] The energy storage device 2 can be specifically understood as a device capable of storing electrical energy and releasing it when needed. For example, the energy storage device 2 can use liquid batteries or solid-state batteries, such as lithium batteries or lead-acid batteries. The electrical energy of the energy storage device 2 can be stored and output quickly, thereby compensating for the response shortcomings of the thermal power unit 1, enabling the thermal power-storage system to have fast and flexible peak-shaving and frequency regulation capabilities, and improving the overall performance and economy of the thermal power-storage system.

[0092] It is understood that the controller 3 in the thermal power unit 1 and the energy storage device 2 are connected to each other in the thermal power unit 1 and the energy storage device 2 respectively, so that the controller 3 can monitor the grid demand in real time and control the thermal power unit 1 and the energy storage device 2 to operate in peak shaving mode or frequency regulation mode, so as to coordinate the power generation of the thermal power unit 1 and the charging and discharging power of the energy storage device 2, so that the energy storage device 2 generates electricity to supplement the electricity generated by the thermal power unit 1, or, part of the electricity generated by the thermal power unit 1 charges the energy storage device 2, so that the overall output of the thermal power unit 1 can meet the power demand of the grid. The controller 3 can execute the control method of the thermal power unit 1 provided in the embodiments of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not described in detail in this embodiment, please refer to the control method of the thermal power unit 1 described in the following embodiments.

[0093] Example 2

[0094] Figure 2 This is a flowchart illustrating a control method for a fire storage system according to Embodiment 2 of the present invention. This embodiment can be used to control the fire storage system described in the above embodiments. The method can be executed by a control device for the fire storage system, which can be implemented in software and / or hardware, and is generally integrated into the controller of the fire storage system. Accordingly, as... Figure 2 As shown, the control method for this fire storage system may include:

[0095] S101. Obtain the current operating mode of the fire storage system.

[0096] The operation modes of a thermal power-storage (TPS) system can include peak-shaving mode and frequency regulation mode. In peak-shaving mode, the power generation of thermal power units and the charging / discharging power of energy storage devices can be controlled based on the grid electricity price and charging / discharging benchmark values. Specifically, peak-shaving mode can be understood as a strategy where the TPS system adjusts its power generation to adapt to fluctuations in the electricity market price, thereby maximizing economic benefits. With the introduction of the electricity spot market, the TPS system needs to develop reasonable control strategies to match the power generation at different times with the real-time electricity price. In frequency regulation mode, the power generation of thermal power units and the charging / discharging power of energy storage devices can be controlled based on the grid demand and the real-time load power of thermal power units. Specifically, frequency regulation mode can be understood as a strategy where the TPS system rapidly adjusts the real-time load power of thermal power units to respond to changes in grid demand, thereby maintaining grid frequency stability. In a power system, frequency is a crucial indicator of supply and demand balance. When the load power of thermal power units deviates from the grid demand, the TPS system adjusts its power generation according to the real-time grid demand.

[0097] Furthermore, the operating modes also include a standby state where neither peak shaving nor frequency regulation is performed when electricity prices are at off-peak or peak levels. This avoids ineffective operation of the thermal power-storage system and reduces equipment losses. For example, when electricity prices are low and there is no need for frequency regulation, the thermal power-storage system can choose to suspend peak shaving operations to maintain the thermal power units at minimum stable operating power and control the energy storage devices to stop charging. When electricity prices are high, but the thermal power units have reached their maximum generating capacity and the energy storage devices are depleted, or there is no need for frequency regulation, the thermal power-storage system can maintain its current state without additional power adjustments, waiting for changes in electricity prices or grid demand.

[0098] Specifically, the controller in the thermal power-storage system obtains the current operating mode of the system in real time, laying the foundation for the subsequent controller to control the power generation of the thermal power unit and the charging and discharging power of the energy storage equipment according to the current operating mode of the thermal power-storage system.

[0099] In an optional embodiment, when the controller determines that the current operating mode of the thermal power-storage system is peak-shaving mode, the controller will control the power generation of the thermal power unit and the charging / discharging power of the energy storage device based on the grid electricity price and the charging / discharging benchmark value. Specifically, the charging / discharging benchmark value can be understood as the economically viable threshold in the thermal power-storage system for determining whether the energy storage device should charge or discharge. The charging benchmark value can be understood as the electricity price threshold at which the cost of charging the energy storage device is just offset by the subsequent discharge revenue under the current electricity price. Below the charging benchmark value, charging is economical, allowing for profitable discharge at higher future electricity prices; above the charging benchmark value, charging costs are too high and not cost-effective. The discharging benchmark value can be understood as the electricity price threshold at which the energy storage device can generate revenue through discharge under the current electricity price. Typically, the discharging benchmark value is higher than the charging benchmark value, and the difference between the two reflects the break-even point of the energy storage device.

[0100] For example, when renewable energy output is high or electricity load is low, the grid electricity price is usually low. For instance, from 9:00 to 16:00 in a 24-hour period, renewable energy generates power in a concentrated manner, supplying more electricity than the grid demand, resulting in a low grid electricity price. When the grid electricity price is lower than the charging benchmark, the thermal power-storage unit can reduce its power generation or charge through energy storage devices to reduce the power generation of the thermal power-storage unit under low electricity prices, thereby reducing settlement losses and potentially obtaining compensation benefits from deep peak shaving. When the grid electricity price rises, for instance, from 16:00 to 24:00 in a 24-hour period, renewable energy generation decreases while electricity load demand increases, leading to a rise in the grid electricity price. When the grid electricity price is higher than the discharge benchmark, the thermal power-storage unit can increase its power generation or discharge through energy storage devices to increase the power generation of the thermal power-storage unit under high electricity prices, thereby obtaining higher settlement benefits and peak compensation.

[0101] By analyzing the previous day's or a given period's renewable energy generation and the electricity demand of grid-connected loads, the current peak and off-peak price ranges can be determined. When transitioning between peak and off-peak price ranges, or vice versa, the thermal power-storage system dynamically adjusts the power generation of the thermal power units and the charging / discharging power of the energy storage devices based on the grid electricity price and charging / discharging benchmark values. This allows the system to minimize losses and store energy during periods of low electricity prices, while discharging during periods of high prices to increase revenue, thus maximizing the utilization of the peak-valley price difference. Furthermore, the rapid charging and discharging capabilities of the energy storage devices compensate for the slow adjustment of the thermal power units, enabling the thermal power-storage system to respond more flexibly to changes in grid electricity prices.

[0102] In another optional embodiment, when the controller determines that the current operating mode of the thermal power-storage system is frequency regulation mode, the controller will control the power generation of the thermal power units and the charging and discharging power of the energy storage devices based on the grid demand power and the real-time load power of the thermal power units. When the grid demand power is greater than the real-time load power of the thermal power units, the controller will control the thermal power units to increase their power generation and control the energy storage devices to discharge rapidly to compensate for the power gap caused by the slow response of the thermal power units, so that the combined power of the thermal power-storage system quickly approaches the grid demand power. When the grid demand power is less than the real-time load power of the thermal power units, the controller will control the thermal power units to reduce their power generation and control the energy storage devices to charge to absorb the excess power, so that the combined power of the thermal power-storage system quickly decreases to the grid demand power. By controlling the power generation of the thermal power units and the charging and discharging power of the energy storage devices based on the grid demand power and the real-time load power of the thermal power units, the combined power of the thermal power-storage system can quickly match the grid demand power, thereby effectively maintaining the stability of the grid frequency.

[0103] S102. When the thermal power unit operating mode switching command is obtained, the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched are obtained.

[0104] Specifically, the switching instruction can be understood as an instruction to switch the operating mode of the thermal power storage system. For example, when the controller determines that the current operating mode of the thermal power storage system is peak-shaving mode, the switching instruction could be an instruction received by the controller indicating a change in the power demand of the mains grid. At this time, the power demand may have fluctuated significantly, requiring frequency regulation mode to prioritize meeting the real-time power demand of the grid. When the controller determines that the current operating mode of the thermal power storage system is frequency regulation mode, the switching instruction could be an instruction received by the controller indicating that the current operating time will change between peak and valley price ranges. The thermal power storage system needs to enter peak-shaving mode at this moment. In this case, the overall output power of the thermal power storage system needs to meet the bid power allocated to the thermal power storage system by the grid. This bid power is usually a stable power value, and peak-shaving mode is used to optimize economic efficiency. Unless otherwise specified, the embodiments of the present invention are illustrated using the example of the thermal power storage system currently operating in peak-shaving mode and the switching instruction being an instruction received by the controller indicating a change in the power demand of the mains grid.

[0105] Understandably, the current power change direction of the thermal power unit under the current operating mode can be interpreted as the overall power generation of the thermal power-storage system increasing or decreasing when operating under the current operating mode; the power change direction of the thermal power unit to be adjusted under the operating mode to be switched can be interpreted as the power generation of the thermal power unit increasing or decreasing when operating under the operating mode to be switched.

[0106] In an optional embodiment, the power change direction in peak-shaving mode can include a positive peak-shaving power change direction and a reverse peak-shaving power change direction. The positive peak-shaving power change direction is the direction of change from the valley price range to the peak price range of the power grid. In this case, to adapt to the trend of increasing bid-winning power within the peak price range, the overall power generation of the thermal power-storage system needs to increase, i.e., the power generation of the thermal power-storage system will change in the positive direction. The reverse peak-shaving power change direction is the direction of change from the peak price range to the valley price range of the power grid. In this case, to adapt to the trend of decreasing bid-winning power within the peak price range, the overall power generation of the thermal power-storage system needs to decrease, i.e., the power generation of the thermal power-storage system will change in the reverse direction.

[0107] In another optional embodiment, the power change direction in frequency regulation mode includes a forward frequency regulation power change direction and a reverse frequency regulation power change direction. The forward frequency regulation power change direction is the power change direction when the grid demand power is greater than the load power of the thermal power unit. In this case, to adapt to the grid demand power, the power generation of the thermal power unit needs to increase. The reverse frequency regulation power change direction is the power change direction when the grid demand power is less than the load power of the thermal power unit. In this case, to adapt to the grid demand power, the power generation of the thermal power unit needs to decrease.

[0108] Specifically, when the controller receives the command to switch the operating mode of the thermal power generation and energy storage system, it can know the operating time period of the thermal power generation and energy storage system in the peak shaving mode or the change in the power demand of the power grid. At this time, in order to prevent the power generation adjustment direction of the thermal power generation and energy storage system in the current operating mode and the operating mode to be switched, it can obtain the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched, and compare the current power change direction with the power change direction to be adjusted, thus laying the foundation for subsequent control of the operating mode of the thermal power generation and energy storage system.

[0109] S103. When the current power change direction is the same as the power change direction to be adjusted, control the fire storage system to operate in frequency regulation mode.

[0110] Specifically, by comparing the current power change direction with the power change direction to be regulated, the controller can determine whether the current power change direction and the power change direction to be regulated are the same. If the current power change direction and the power change direction to be regulated are the same, it can be determined that the power generation of the thermal power-storage system under the current mode and the power generation of the thermal power unit under the mode to be switched both show an increasing or decreasing trend. At this time, the thermal power-storage system can be controlled to operate in frequency regulation mode, so as to control the power generation trend of the thermal power unit and the charging and discharging status of the energy storage device according to the grid demand power and the real-time load of the thermal power unit, i.e., the grid demand power and the real-time power generation of the thermal power unit. This ensures that the overall power generation of the thermal power-storage system is comparable to the grid demand power, preventing energy waste while ensuring the stability of the power supplied to the grid.

[0111] For example, taking the current operating mode as peak shaving mode and the operating mode to be switched to as frequency regulation mode as an example, when the current power change direction is the same as the power change direction to be regulated, by prioritizing the operation of frequency regulation mode, the combined power of the thermal power and energy storage system can be quickly adjusted based on the real-time grid demand power and the load power of thermal power units to maintain grid frequency stability and ensure that the real-time power supply demand of the grid is met. Compared with the peak shaving mode, which relies on the previous day's electricity price forecast, the frequency regulation mode has stronger real-time performance, thus allowing for more accurate adjustment of the power generation of thermal power units and the charging and discharging power of energy storage devices, avoiding power mismatch caused by forecast deviations. In addition, through the coordinated control of the integrated peak shaving mode and frequency regulation mode, the thermal power and energy storage system can, while prioritizing grid demand in frequency regulation mode, utilize peak shaving mode to control the thermal power and energy storage system to charge when the grid electricity price is at a low price and discharge when the grid electricity price is at a high price, thereby optimizing economic benefits and meeting the power supply demand of the grid while ensuring economic benefits.

[0112] In this embodiment, by including peak-shaving mode and frequency regulation mode in the operation mode of the thermal power-storage system, the power generation of the thermal power unit and the charging and discharging power of the energy storage device can be controlled according to the grid electricity price and charging and discharging benchmark value in peak-shaving mode. This allows the thermal power-storage system to reduce losses and store energy when the electricity price is low, and to discharge and increase revenue when the electricity price is high, thus maximizing the utilization of the peak-valley electricity price difference. At the same time, the rapid charging and discharging capability of the energy storage device compensates for the slow adjustment of the thermal power unit, enabling the thermal power-storage system to respond more flexibly to changes in the grid electricity price. In frequency regulation mode, the power generation of the thermal power unit and the charging and discharging power of the energy storage device are controlled according to the grid demand power and the real-time load power of the thermal power unit. This allows the combined power of the thermal power-storage system to quickly match the grid demand power and maintain the stable operation of the grid frequency. Furthermore, by acquiring the current operating mode of the thermal power-storage system, it is possible to determine which mode the system is currently operating in, thereby executing corresponding control strategies to meet the grid's needs and the system's economic efficiency. Simultaneously, upon receiving a command to switch the thermal power-storage system's operating mode, the system acquires the current power change direction of the thermal power unit in the current operating mode and the direction of the power change to be adjusted in the mode to be switched. When the current power change direction and the direction of the power change to be adjusted are the same, the thermal power-storage system is controlled to operate in frequency regulation mode. This ensures that when the frequency regulation mode and peak shaving mode aim to adjust the power generation of the thermal power unit in the same direction, the thermal power-storage system is prioritized to operate in frequency regulation mode, guaranteeing that the combined power of the thermal power-storage system can meet the real-time power supply needs of the grid, thus improving the accuracy of regulating the power generation of the thermal power unit and the charging and discharging power of the energy storage device. In this embodiment, through the coordinated control of the integrated peak shaving mode and frequency regulation mode of the thermal power-storage system, the power supply needs of the grid are met while ensuring economic benefits.

[0113] Example 3

[0114] Figure 3 This is a flowchart illustrating a control method for a fire storage system according to Embodiment 3 of the present invention. Based on the above embodiments, this embodiment describes the control method for the fire storage system when the current power change direction differs from the power change direction to be adjusted. Accordingly, as shown... Figure 3 As shown, the control method for this fire storage system may include:

[0115] S201. Obtain the current operating mode of the fire storage system.

[0116] The operating modes of the thermal energy storage system can include peak shaving mode and frequency regulation mode.

[0117] S202. When a command to switch the operating mode of the thermal power unit is received, the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched are obtained.

[0118] S203. When the current power change direction is the same as the power change direction to be adjusted, control the fire storage system to operate in frequency regulation mode.

[0119] S204. When the current power change direction is different from the power change direction to be adjusted, obtain the comprehensive peak-shaving benefit in peak-shaving mode and the comprehensive frequency-modulation benefit in frequency-modulation mode.

[0120] The difference between the current power change direction and the power change direction to be adjusted can be understood as follows: If the current operating mode is peak shaving mode and the operating mode to be switched to is frequency regulation mode, then under the current operating mode, the power generation of the thermal power-storage system needs to be increased to adapt to the winning bid power of the thermal power-storage system. Under the operating mode to be switched to, the power demand of the grid decreases, so the power generation of the thermal power units needs to decrease accordingly. Alternatively, if the current operating mode is peak shaving mode and the operating mode to be switched to is frequency regulation mode, then under the current operating mode, the power generation of the thermal power-storage system needs to be decreased to adapt to the winning bid power of the thermal power-storage system. Under the operating mode to be switched to, the power demand of the grid increases, so the power generation of the thermal power units needs to increase accordingly. Conversely, when the current operating mode is frequency regulation mode and the operating mode to be switched to is peak shaving mode, the above is similar and will not be elaborated here.

[0121] Specifically, when the controller determines that the current power change direction is different from the power change direction to be regulated, that is, when the frequency regulation mode and the peak regulation mode aim to adjust the power generation of the thermal power unit in different directions, the controller will obtain the comprehensive peak regulation benefit of the thermal power storage system in the peak regulation mode and the comprehensive frequency regulation benefit of the thermal power storage system in the frequency regulation mode, and compare the magnitude of the comprehensive peak regulation benefit and the comprehensive frequency regulation benefit, thereby laying the foundation for controlling the operation mode of the thermal power storage system.

[0122] The comprehensive peak-shaving revenue under the peak-shaving mode can be understood as the total economic return obtained by the thermal power-storage system through the peak-shaving mode. It can include three parts: First, the indirect revenue from reduced performance assessments. When thermal power units fail to provide basic peak-shaving capacity according to grid dispatch instructions due to their own regulation capacity limitations, they will face power assessment and revenue penalties. By quickly supplementing the power deviation of thermal power units through energy storage devices, the assessment penalties caused by insufficient peak-shaving capacity of thermal power units can be reduced or avoided, indirectly saving costs for the system and generating revenue. Second, the revenue from peak-valley electricity price differences. That is, the thermal power-storage system utilizes the peak-valley fluctuations of electricity prices to control the charging and storage of energy by energy storage devices or reduce the power generation of thermal power units during off-peak periods, and to control the discharging of energy storage devices or increase the power generation of thermal power units during peak periods, creating direct economic benefits through "buying low and selling high". Third, the revenue from deep peak-shaving compensation. When the thermal power-storage system actively reduces its power to below the basic peak-shaving capacity during off-peak periods, that is, deep peak-shaving, it will receive additional compensation for the reduced power generation. This compensation is a reward for providing deep peak-shaving services and is usually stipulated by grid or market policies.

[0123] The comprehensive benefits of frequency regulation under the frequency regulation mode can be specifically understood as the total economic return obtained by the thermal power-storage system through the frequency regulation mode, which includes two parts: First, the indirect benefit of exemption from assessment, that is, by combining energy storage equipment with thermal power units to form a thermal power-storage system, the shortcomings of the frequency regulation performance of thermal power units are made up for, thereby avoiding assessment penalties for failing to meet the power demand of the grid; Second, the comprehensive benefit of frequency regulation mileage, that is, the total amount of power adjustment increased by the thermal power-storage system due to rapid adjustment during the frequency regulation process, i.e., the frequency regulation mileage, can obtain ancillary service compensation benefits from the grid or the electricity market.

[0124] S205. When the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency regulation benefit, control the fire storage system to operate in frequency regulation mode.

[0125] Specifically, when the controller determines that the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency regulation benefit, it will control the thermal power-storage system to operate in frequency regulation mode. This allows the thermal power-storage system to obtain higher economic returns through frequency regulation and enables rapid adjustment of the combined power of the thermal power-storage system by prioritizing frequency regulation to maintain grid frequency stability and ensure that the real-time power supply demand of the grid is met. The selection of frequency regulation and peak-shaving modes based on the comparison of comprehensive peak-shaving and frequency regulation benefits allows the thermal power-storage system to flexibly adapt to the dual demands of the grid and the market, ensuring economic benefits while meeting the grid's power supply needs.

[0126] S206. When the comprehensive benefits of peak shaving are greater than the comprehensive benefits of frequency regulation, control the thermal energy storage system to operate in peak shaving mode.

[0127] Specifically, when the controller determines that the comprehensive benefits of peak shaving are greater than those of frequency regulation, it will control the thermal power and energy storage system to operate in peak shaving mode. This allows the thermal power and energy storage system to obtain higher economic returns through peak shaving mode and to fully utilize the peak-valley fluctuations in the grid electricity price. By charging during off-peak hours and discharging during peak hours, it can obtain higher peak-valley price difference revenue. At the same time, the peak shaving mode operates with a longer adjustment cycle, reducing the frequent start-up and shutdown or power switching of thermal power units and energy storage equipment, thereby reducing equipment losses in the thermal power and energy storage system and improving the long-term stability and lifespan of the thermal power and energy storage system.

[0128] In this embodiment, by obtaining the comprehensive peak-shaving revenue in peak-shaving mode and the comprehensive frequency regulation revenue in frequency regulation mode when the current power change direction differs from the power change direction to be regulated, the thermal power storage system can be controlled to operate in frequency regulation mode when the comprehensive peak-shaving revenue is less than or equal to the comprehensive frequency regulation revenue, and can be controlled to operate in peak-shaving mode when the comprehensive peak-shaving revenue is greater than the comprehensive frequency regulation revenue. This allows the thermal power storage system to obtain higher economic returns through either frequency regulation or peak-shaving mode. Simultaneously, by selecting frequency regulation mode and peak-shaving mode based on the comparison of the comprehensive peak-shaving revenue and the comprehensive frequency regulation revenue, the thermal power storage system can flexibly adapt to the dual demands of the power grid and the market, ensuring economic benefits while meeting the power supply needs of the power grid.

[0129] Example 4

[0130] Figure 4 This is a flowchart illustrating a control method for a thermal power generation and energy storage system under peak-shaving mode, provided in Embodiment 4 of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the method for controlling the power generation of thermal power units and the charging and discharging power of energy storage devices under peak-shaving mode. Accordingly, as shown... Figure 4 As shown, the control method for this fire storage system may include:

[0131] S301. In peak shaving mode, obtain the peak shaving parameters of the thermal energy storage system in real time.

[0132] Specifically, peak-shaving mode can be understood as an operational strategy in which a thermal power generation and energy storage system adjusts its power generation to adapt to fluctuations in electricity prices in the electricity market, thereby maximizing economic benefits. Therefore, acquiring the peak-shaving parameters of the thermal power generation and energy storage system in real time lays the foundation for subsequent control of the power generation of thermal power units and the charging and discharging power of energy storage devices.

[0133] Optionally, peak-shaving parameters include the grid electricity price and the charging / discharging benchmark value.

[0134] The grid electricity price can be determined based on electricity demand over a period of time or the previous day's demand. For example, during periods of low electricity demand when renewable energy output is high, the grid electricity price can be lower, while during peak electricity demand periods when renewable energy output is reduced, the grid electricity price can also be lower. The charge / discharge benchmark value can be understood as the economically critical point used in a thermal energy storage system to determine whether energy storage devices should charge or discharge. The charge / discharge benchmark value can include both a charging benchmark value and a discharging benchmark value.

[0135] Understandably, the charging benchmark can be interpreted as the electricity price threshold at which the cost of charging the energy storage device is just offset by the subsequent discharge revenue under the current electricity price; the discharging benchmark can be interpreted as the electricity price threshold at which the energy storage device can generate revenue through discharging under the current electricity price. Typically, the discharging benchmark is higher than the charging benchmark, and the difference between the two reflects the break-even point of the energy storage device. For example, if the energy storage device can break even when the peak-valley electricity price difference is 0.6 yuan, then the discharging benchmark = charging benchmark + 0.6, meaning the energy storage device will only discharge when the peak-hour electricity price is 0.6 yuan higher than the off-peak price.

[0136] S302. Control the power generation of thermal power units and the charging and discharging power of energy storage devices according to peak shaving parameters.

[0137] Specifically, after acquiring the peak-shaving parameters of the thermal power unit and the charging and discharging power of the energy storage device in real time, the power generation of the thermal power unit and the charging and discharging power of the energy storage device will be controlled according to the peak-shaving parameters, so that the thermal power unit and the energy storage device can formulate a reasonable control strategy, thereby matching the power generation of each time period with the real-time electricity price.

[0138] Optionally, based on peak-shaving parameters, the power generation of thermal power units and the charging and discharging power of energy storage devices are controlled, including: constructing a peak-shaving charging and discharging function based on the grid electricity price and charging and discharging benchmark values; controlling the charging and discharging power of energy storage devices based on the peak-shaving charging and discharging function; and controlling the power generation of thermal power units based on the charging and discharging power of energy storage devices and the winning bid power of the thermal power-storage system.

[0139] Among them, the peak-shaving charge and discharge function can be a formula for controlling the charge and discharge power of energy storage equipment in peak-shaving mode, so that the fire-storage system can have high economic value.

[0140] Optionally, the peak-shaving charge / discharge function includes a peak-shaving charge function and a peak-shaving discharge function:

[0141] The peak-shaving charging function is:

[0142]

[0143] Among them, P 充 denoted as , where is the current charging power of the energy storage device, x is the real-time electricity price of the grid, Pn is the rated charging and discharging power of the energy storage device, k1 and C1 are both charging coefficients, and b is the benchmark charging price.

[0144] The peak-shaving discharge function is:

[0145]

[0146] Among them, P 放Let be the current discharge power of the energy storage device, x be the real-time electricity price of the grid, Pn be the rated charging and discharging power of the energy storage device, k2 and C2 be the discharge coefficients, and c be the discharge benchmark electricity price.

[0147] Specifically, the peak-shaving charging function is as follows: Figure 5 As shown, the peak-shaving discharge function is as follows: Figure 6 As shown. The controller first determines the relationship between the real-time grid price x, the charging benchmark price b, and the discharging benchmark price c. When the real-time grid price x is less than the charging benchmark price b, the energy storage device will charge; when the real-time grid price x is greater than the discharging benchmark price c, the energy storage device will discharge. Specifically, when the energy storage device is charging, if the real-time grid price x is less than the charging benchmark price b and less than price a, the energy storage device will charge at its rated charging and discharging power. At this time, the electricity price is highly economical, and the energy storage device will store energy at its maximum capacity for subsequent high-price discharge. If the real-time grid price x is between price a and the charging benchmark price b, the charging power of the energy storage device will follow a linear function P. 充 =k1*x+C1 is used for adjustment. As the real-time electricity price x of the power grid increases, the economic efficiency gradually decreases, and the charging power of the energy storage device will also gradually decrease. If the real-time electricity price x of the power grid exceeds the charging benchmark price b, the energy storage device will stop charging, that is, the charging power of the energy storage device will be 0. At this time, the charging cost is too high and it is no longer cost-effective.

[0148] When an energy storage device discharges, if the real-time electricity price x is lower than the discharge benchmark price c, the discharge power of the energy storage device is 0. In this case, the real-time electricity price x is too low to cover the discharge cost, making it uneconomical. If the real-time electricity price x is between the discharge benchmark price c and the electricity price d, the discharge power of the energy storage device will follow a linear function P. 放 =k2*x+C2 is used for adjustment. As the real-time electricity price x of the power grid increases, the revenue gradually increases, and the discharge power of the energy storage device will also gradually increase. If the real-time electricity price x of the power grid exceeds the electricity price d, the real-time electricity price x of the power grid is extremely high. At this time, the energy storage device will discharge at the rated power of the energy storage device to maximize the discharge revenue.

[0149] It is understood that electricity price a can be equal to electricity price c, electricity price d can be the sum of electricity price a and electricity price c, and K1 and K2 can be equal or unequal. This invention does not impose specific limitations on the comparison.

[0150] After determining the peak-shaving charge / discharge function, the controller will control the charging and discharging power of the energy storage device based on the real-time electricity price of the grid and the peak-shaving charge / discharge function. This allows the energy storage device to reduce losses and store energy during low electricity prices, and discharge during high electricity prices to increase revenue, thereby maximizing the utilization of the peak-valley electricity price difference and optimizing the economic benefits of the thermal power-storage system. After determining the charging and discharging power of the energy storage device based on the peak-shaving charge / discharge function, the controller will control the power generation of the thermal power units based on the charging and discharging power of the energy storage device and the winning bid power of the thermal power-storage system. The winning bid power can be understood as the expected power generation allocated to the thermal power-storage system by the grid or electricity trading center in the electricity market based on the previous day's application and bidding results. The winning bid power reflects the total power that the thermal power-storage system promises to provide to the grid during a specific period, and is composed of the power generation of the thermal power units in the thermal power-storage system and the charging and discharging power of the energy storage device. For example, when the energy storage device discharges, the winning bid power is the sum of the generating power of the thermal power unit and the discharging power of the energy storage device; when the energy storage device charges, the winning bid power is the difference between the generating power of the thermal power unit and the charging power of the energy storage device. Therefore, by determining the charging and discharging power of the energy storage device and the winning bid power of the thermal power-storage system, the generating power of the thermal power unit can be determined. This allows the energy storage device and the thermal power unit to jointly perform peak shaving for the thermal power-storage system. At the same time, the rapid charging and discharging capability of the energy storage device compensates for the slow adjustment of the thermal power unit, enabling the thermal power-storage system to respond more flexibly to changes in the grid electricity price, thus achieving both economic benefits and meeting the power supply needs of the grid.

[0151] In this embodiment, by acquiring the peak-shaving parameters of the thermal power-storage system in real time during peak-shaving mode, the power generation of the thermal power units and the charging and discharging power of the energy storage devices can be controlled according to these parameters. This allows the thermal power-storage system to formulate a reasonable control strategy, thereby matching the power generation at different times with the real-time electricity price. By constructing a peak-shaving charging and discharging function based on the grid electricity price and charging and discharging benchmark values, the charging and discharging power of the energy storage devices can be controlled according to this function. This enables the energy storage devices to reduce losses and store energy during low electricity prices, and to discharge and increase revenue during high electricity prices, thus maximizing the utilization of the peak-valley electricity price difference and optimizing the economic benefits of the thermal power-storage system. Furthermore, by controlling the power generation of the thermal power units based on the charging and discharging power of the energy storage devices and the winning bid power of the thermal power-storage system, the energy storage devices and thermal power units can jointly perform peak-shaving for the thermal power-storage system. The rapid charging and discharging capability of the energy storage devices compensates for the slow adjustment of the thermal power units, allowing the thermal power-storage system to respond more flexibly to changes in grid electricity prices, achieving both economic benefits and meeting the power supply demand of the grid.

[0152] Example 5

[0153] Figure 7This is a flowchart illustrating a control method for a thermal power storage system under peak-shaving mode according to Embodiment 5 of the present invention. Based on the above embodiments, this embodiment describes the operating conditions of the peak-shaving mode. Accordingly, as shown... Figure 7 As shown, the control method for this fire storage system may include:

[0154] S401. Obtain the winning bid power of the thermal power-storage system and the economic range of the power generation capacity of the thermal power-storage system.

[0155] Specifically, to determine whether a thermal power-storage system meets the conditions for entering peak-shaving mode, the controller will first obtain the winning bid power and the economic range of the system's power generation. The winning bid power can be understood as the expected power generation allocated to the thermal power-storage system by the power grid or power trading center in the electricity market, based on the previous day's bidding results. The economic range of the thermal power-storage system's power generation can be understood as the range of power output that the system can deliver with high economic efficiency and stability during operation. This range comprehensively considers the operating characteristics of the thermal power unit, the regulation capability of the energy storage equipment, and the constraints of the power grid, ensuring that the thermal power-storage system operates within this range to both meet the power supply demand of the grid and optimize economic returns.

[0156] Optionally, the lower limit of the economic range for the power generation capacity of the thermal power-storage system is P. min The upper limit of power is P max ;in:

[0157] P min =MAX{P Gmin -P ec P Gmin -P allow1};

[0158] P max =MIN{P Gmax +P ed P Gmax +P allow2};

[0159] Among them, P Gmin P is the minimum generating capacity of a thermal power unit. Gmax P represents the maximum generating capacity of the thermal power unit. ec P is the rated charging power of the energy storage device. ed P is the rated discharge power of the energy storage device. allow1 P is the lower limit of the permissible power generation capacity of the thermal energy storage system. allow2 This is the upper limit of the permissible power generation capacity of the thermal energy storage system.

[0160] Specifically, the lower limit of the power generation capacity of the thermal power storage system during periods of low grid electricity prices is P. min Pmin The value is P Gmin -P ec and P Gmin -P allow1 The larger value in, where P Gmin P represents the minimum generating capacity of a thermal power unit, which takes into account factors such as boiler operating stability, unit operating economy, and heating demand of the cogeneration unit. ec P is the rated charging power of the energy storage device. Gmin -P ec This represents the minimum net output power of the thermal energy storage system when the energy storage device is charged at its rated power; that is, the lower limit of the power generation capacity that the energy storage device can extend from the thermal energy storage system. allow1 This is the lower limit of the permissible power generation capacity of the thermal power-storage system, which takes into account factors such as medium- and long-term power trading. P Gmin -P allow1 This indicates the minimum net output power requirement of the power grid for the thermal power storage system. P min Take P Gmin -P ec and P Gmin -P allow1 The larger value in the range ensures that the lower limit of the power generation of the thermal power-storage system does not exceed the technical limitations of the thermal power units and energy storage equipment, nor is it lower than the minimum power generation requirements of the power grid for the thermal power-storage system.

[0161] The upper limit of power generation of the thermal energy storage system during peak electricity price periods is P. max P max The value is P Gmax +P ed and P Gmax +P allow2 The smaller value in, where P Gmax P represents the maximum generating capacity of the thermal power unit, which takes into account factors such as boiler operating stability, unit operating economy, and heating demand of the cogeneration unit. ed P is the rated discharge power of the energy storage device. Gmax +P ed This represents the maximum output power of the thermal energy storage system when the energy storage device discharges at its rated power; in other words, it represents the upper limit of the power generation capacity that the energy storage device can extend from the thermal energy storage system. allow2 This is the upper limit of the permissible power generation capacity of the thermal power-storage system. The lower limit takes into account factors such as medium- and long-term power trading. Gmax +P allow2 This indicates the maximum net output power requirement of the power grid for the thermal power storage system. (P) max Take P Gmax +P ed and P Gmax +P allow2The smaller value in the range ensures that the upper limit of the power generation of the thermal power-storage system does not exceed the technical limitations of thermal power units and energy storage equipment, nor does it exceed the maximum power generation limit of the power grid for the thermal power-storage system.

[0162] S402. When the winning bid power is within the economic range of power generation, obtain the operating condition information of the energy storage equipment.

[0163] Specifically, when the controller determines that the bid-winning power of the thermal energy storage system falls within its economic power range based on the acquired bid power and the economic power range of the system, it can be concluded that the overall output of the thermal energy storage system can simultaneously meet both economic and grid power demands. At this point, the controller will continue to acquire operating status information of the energy storage equipment to further determine whether the thermal energy storage system meets the conditions for entering peak-shaving mode. The operating status information of energy storage devices includes the working status of core components such as the Battery Management System (BMS), Power Conversion System (PCS), and Energy Management System (EMS); the State of Charge (SOC) of the energy storage devices; the status requirements for the coordinated operation of thermal power units and energy storage devices, such as whether the thermal power units have fault signals such as Main Fuel Trip (MFT) or Runback (RB), whether the unit load rate is within the set range, and whether the unit is in operation; whether the electrical protection and control functions of the charging and discharging circuits of the energy storage devices are operating normally; and whether the feedback signals of key operating parameters of the energy storage devices and thermal power units, such as power, voltage, current, and SOC, are complete and correct, and whether there is any data loss or abnormality.

[0164] S403. When it is determined that the energy storage equipment meets the conditions for commissioning based on the operating condition information of the energy storage equipment, the thermal energy storage system is controlled to enter the peak shaving mode.

[0165] Specifically, after the controller acquires the operating condition information of the energy storage device, it determines whether the energy storage device meets the conditions for commissioning based on this information. For example, if the core components of the energy storage device, such as the BMS, PCS, and EMS, are all in normal working condition with no alarm or fault signals, and the SOC of the energy storage device is within the preset allowable range, and the thermal power unit has no MFT or RB fault signals, the unit load rate is within the set range, and the unit is in operation, and the electrical protection and control functions of the energy storage device's charging and discharging circuit are operating normally, and the feedback signals of the key operating parameters of the energy storage device and the thermal power unit are complete and correct, with no data loss or abnormalities, then the energy storage device can be considered to meet the conditions for commissioning. At this time, the controller will control the thermal power-storage system to enter peak-shaving mode, thereby improving economic benefits and meeting the power demand of the grid while ensuring the safe and reliable operation of the thermal power-storage system, thus extending the service life of the thermal power-storage system.

[0166] S404. When the awarded power is not within the economic range of power generation, or when the operating condition system of the energy storage equipment determines that the energy storage equipment does not meet the conditions for commissioning, the energy storage equipment shall be controlled to be in standby mode, and the thermal power unit shall be controlled to generate electricity at the awarded power.

[0167] Specifically, when the controller determines that the winning bid power is not within the economic range of power generation, or the energy storage equipment does not meet the conditions for commissioning, it means that the thermal power-storage system does not meet the conditions for entering the peak shaving mode. At this time, the controller will control the energy storage equipment to be in standby mode and control the thermal power unit to generate electricity independently at the winning bid power so as to meet the power demand of the grid and avoid equipment damage or safety accidents caused by the operation failure of the energy storage equipment, thereby improving the safety and operational stability of the thermal power-storage system.

[0168] In addition, after the controller puts the energy storage device into standby mode and controls the thermal power unit to generate electricity at the bid power, it can continue to monitor in real time whether the bid power is within the economic range of power generation and whether the energy storage device meets the conditions for commissioning. When it detects that the bid power is within the economic range of power generation and the energy storage device meets the conditions for commissioning, it can control the thermal power storage system to enter the peak shaving mode.

[0169] S405. In peak shaving mode, obtain the peak shaving parameters of the thermal energy storage system in real time.

[0170] S406. Control the power generation of thermal power units and the charging and discharging power of energy storage devices according to peak shaving parameters.

[0171] This embodiment obtains the winning bid power and the economic range of the power generation capacity of the thermal power-storage system. When the winning bid power is within the economic range, it acquires the operating condition information of the energy storage device. Based on this information, it determines that the energy storage device meets the conditions for commissioning and controls the thermal power-storage system to enter peak-shaving mode. This ensures the safe and reliable operation of the thermal power-storage system, improves economic benefits, meets the power demand of the grid, and extends the system's lifespan. Conversely, when the winning bid power is not within the economic range, or when the operating condition system determines that the energy storage device does not meet the conditions for commissioning, it controls the energy storage device to be in standby mode and controls the thermal power unit to generate electricity at the winning bid power. This meets the power demand of the grid and avoids equipment damage or safety accidents caused by operational failures of the energy storage device, improving the safety and operational stability of the thermal power-storage system.

[0172] Example 6

[0173] Figure 8 This is a flowchart illustrating a control method for a thermal power unit and its energy storage system in frequency regulation mode, provided in Embodiment Six of the present invention. Based on the above embodiments, this embodiment provides a detailed description of the method for controlling the power generation of a thermal power unit and the charging and discharging power of an energy storage device in frequency regulation mode. Accordingly, as shown... Figure 8 As shown, the control method for this fire storage system may include:

[0174] S501. In frequency regulation mode, obtain the frequency regulation parameters of the fire storage system in real time.

[0175] Specifically, frequency regulation mode can be understood as a strategy in which the thermal power-storage system rapidly adjusts the real-time load power of thermal power units to respond to changes in the power demand of the power grid, thereby maintaining stable grid frequency. Therefore, acquiring the frequency regulation parameters of the thermal power-storage system in real time lays the foundation for subsequent control of the power generation of thermal power units and the charging and discharging power of energy storage devices.

[0176] Optionally, the frequency regulation parameters include the grid demand power, the load power of the thermal power units, and the dead zone power threshold of the thermal power units.

[0177] Specifically, the grid demand power can be understood as the target power that the grid requires the thermal power-storage system to provide at a certain moment through frequency regulation commands, such as Automatic Generation Control (AGC) commands. The initial load power of the thermal power unit can be understood as the actual generating power of the thermal power unit just before receiving the AGC command. The current load power of the thermal power unit can be understood as the real-time generating power of the thermal power unit at a specific moment during frequency regulation; the current load power of the thermal power unit is a dynamic value that changes with frequency regulation adjustments. The dead zone power threshold of the thermal power unit can be understood as the range within which the thermal power unit will not respond when the power deviation is less than this value during frequency regulation. For example, the dead zone power threshold of the thermal power unit can be approximately 1% of the rated power of the thermal power unit.

[0178] Specifically, when the controller determines that the current operating mode of the thermal power storage system is frequency regulation mode, the controller will first obtain the grid demand power, the initial load power of the thermal power unit, the current load power of the thermal power unit, and the dead zone power threshold of the thermal power unit, thus providing a basis for subsequently constructing the frequency regulation charging and discharging formula and controlling the charging and discharging power of the energy storage device and the power generation power of the thermal power unit.

[0179] S502. Control the power generation of thermal power units and the charging and discharging power of energy storage devices according to the frequency regulation parameters.

[0180] Specifically, after acquiring the frequency regulation parameters of the thermal power unit and the charging and discharging power of the energy storage device in real time, the power generation of the thermal power unit and the charging and discharging power of the energy storage device will be controlled according to the frequency regulation parameters, so as to adjust the power generation in real time according to the power demand of the grid when the load power of the thermal power unit deviates from the power demand of the grid.

[0181] Optionally, based on the frequency regulation parameters, the power generation of the thermal power unit and the charging and discharging power of the energy storage device are controlled, including: constructing a frequency regulation charging and discharging formula based on the grid demand power, the initial load power of the thermal power unit, the current load power of the thermal power unit and the dead zone power threshold; and controlling the charging and discharging power of the energy storage device and the power generation of the thermal power unit based on the frequency regulation charging and discharging formula.

[0182] Among them, the frequency regulation charging and discharging formula can be used to control the charging and discharging power of energy storage devices in frequency regulation mode, so that the overall power generation of the thermal energy storage system can meet the grid demand and ensure the stability of the power supplied to the grid by the thermal energy storage system.

[0183] Optionally, based on the grid demand power, initial load power, current load power, and dead zone power threshold, a frequency regulation charging and discharging formula is constructed, including: determining the current frequency regulation stage of the thermal power unit based on the grid demand power, initial load power, current load power, and dead zone power threshold; the frequency regulation stage includes a response stage, a ramp-up stage, and a steady-state stage; determining the current frequency regulation charging and discharging formula based on the current frequency regulation stage of the thermal power unit; wherein, under the response stage, the frequency regulation charging and discharging formula is:

[0184]

[0185] During the ramp-up phase, the frequency-modulated charging and discharging formula is:

[0186]

[0187] In the steady-state phase, the formula for frequency-modulated charging and discharging is:

[0188]

[0189] Among them, P Be1 To determine the charging and discharging power of the energy storage device during the response phase, P Be2 P represents the charging and discharging power of the energy storage device during the ramp-up phase. Be3 P represents the charging and discharging power of the energy storage device during the steady-state phase. AGC P is the power demand of the power grid. G0 P is the initial load power. G P represents the current load power. D This is the dead zone power threshold.

[0190] Specifically, the response phase can be understood as the initial stage immediately after the frequency regulation command is issued. At this time, the thermal power unit begins to respond from the initial load power, but due to its large inertia and delay characteristics, power adjustment has not yet occurred significantly. The ramp-up phase can be understood as the transition phase after the response phase, where the thermal power unit begins to adjust its power and move closer to the grid's demand power. The steady-state phase can be understood as the stage where the thermal power unit maintains stable operation after its current load power approaches or reaches the grid's demand power.

[0191] It is understandable that the frequency regulation performance of a thermal power unit is represented by three parameters: regulation rate k1, regulation accuracy k2, and response time k3. Regulation rate k1 is the rate of change of power within a unit of time, reflecting the unit's regulation capability during the ramp-up phase. Regulation accuracy k2 is the deviation between the unit's power generation and the target power during the steady-state phase, reflecting the accuracy and stability of the unit's power output. Response time k3 is the time required for the unit to receive the frequency regulation command and for its power output to begin changing significantly, reflecting the unit's rapid response. The product of these three parameters, K = k1 * k2 * k3, represents the overall frequency regulation performance of the thermal power unit. A higher K value indicates superior response speed, regulation rate, and accuracy in frequency regulation, making it more likely to win bids and obtain higher returns in the frequency regulation ancillary services market. Therefore, the purpose of a thermal power-storage system is to improve the K value of the thermal power unit through the synergistic effect of energy storage devices.

[0192] By comparing the relationship between grid demand power, initial load power, current load power, and dead zone power threshold, the current frequency regulation stage of the thermal power unit can be determined. For example, when the frequency regulation command is first issued, if the current load power is close to the initial load power, and the deviation between the current load power and the initial load power is less than the dead zone power threshold, it indicates that the thermal power unit has not yet significantly adjusted its power, and is in the response stage, requiring rapid adjustment of its generating power to escape the dead zone. If the deviation between the current load power and the initial load power is greater than the dead zone power threshold, but the current load power is still not close to the grid demand power, it indicates that the thermal power unit has begun to adjust its power, but has not yet completed the adjustment, indicating that the thermal power unit is in the ramp-up stage. If the current load power is close to the grid demand power, and the deviation between the current load power and the grid demand power is less than or equal to the dead zone power threshold, it indicates that the thermal power unit's load power has basically reached the grid demand power, the deviation has entered the dead zone range, and the thermal power unit is in the steady-state stage. By determining the current frequency regulation stage of the thermal power unit based on the grid demand power, initial load power, current load power, and dead zone power threshold, a basis is provided for subsequently determining the frequency regulation charging and discharging formula for the current frequency regulation stage.

[0193] Specifically, after the controller determines the current frequency regulation stage of the thermal power unit, it will determine the current frequency regulation charging and discharging formula so that it can control the charging and discharging power of the energy storage device in different frequency regulation stages according to the frequency regulation charging and discharging formula of different frequency regulation stages.

[0194] For example, Figure 9 This is a schematic diagram of the frequency modulation command response process of a fire storage system provided in Embodiment Six of the present invention, as shown below. Figure 9As shown, during the time period from time t1 to time t2, the thermal power unit is in the response phase. At this time, the frequency regulation command has just been issued, and the thermal power unit has not yet significantly adjusted its power. The current load power P G With initial load power P G0 The difference between them is less than the dead zone power threshold P. D This indicates that the thermal power units have not yet exited the dead zone, and the power demand P of the power grid is still high. AGC Greater than the initial load power P G0 This indicates that the thermal power unit needs to increase its power output. At this time, the energy storage device discharges so that the combined power of the thermal power and energy storage system can quickly approach the dead zone boundary. Therefore, in (P AGC >P G0 )∩(P G <P G0 +P D Under these conditions, the charging and discharging power P of the energy storage device Be1 MAX{P D -(P G -P G0 ),0}, so that the energy storage device can quickly make up for the dead zone power difference, thereby shortening the response time K3 of the thermal power unit. As the current load power P of the thermal power unit G With the increase, the discharge power P of the energy storage device Be1 This will be reduced to maintain the SOC balance of the fire storage system. Furthermore, in (P AGC <P G0 )∩(P G >P G0 -P D In this case, it indicates that the thermal power unit has not yet exited the dead zone, and the power demand P of the power grid is still high. AGC Less than the initial load power P G0 At this time, energy storage equipment needs to be charged to absorb the excess power of the thermal power unit. Therefore, the charging and discharging power P of the energy storage equipment... Be1 For MIN{-P D -(P G -P G0 ),0}. Where, when P Be1 When P is positive, it indicates that the energy storage device is discharging at that power; when P is positive, it indicates that the energy storage device is discharging at that power. Be1 When the value is negative, it indicates that the energy storage device is charging at that power.

[0195] Continue to refer to Figure 9 During the time interval from t2 to t3, the thermal power unit is in the ramp-up phase. At this time, the thermal power unit crosses the dead zone, that is, the current load power P... G With initial load power P G0 The difference between them is greater than or equal to the dead zone power threshold P. D However, the power demand P of the power grid AGCWith current load power P G The difference between them is still greater than the dead zone power threshold P. D This indicates that the thermal power unit has not yet completed its adjustment and the current load power P still needs to be adjusted. G Power demand P from the grid AGC Transition. Therefore, in (P) AGC >P G0 )∩(P G ≥P G0 +P D )∩(P G <P AGC -P D Under these conditions, the charging and discharging power P of the energy storage device Be2 For P AGC -P G -P D This allows energy storage devices to provide additional power support to thermal power units, shortening their ramp-up time and improving their regulation rate K1. Furthermore, in (P AGC <P G0 )∩(P G ≤P G0 -P D )∩(P G >P AGC +P D In this case, it indicates that the thermal power unit has crossed the dead zone, and the current load power P G Not yet close to the grid demand power P AGC And the power demand P of the power grid AGC Less than the initial load power P G0 At this time, energy storage equipment needs to be charged to absorb the excess power of the thermal power unit. Therefore, the charging and discharging power P of the energy storage equipment... Be2 For P AGC -P G +P D This makes the current load power P G Able to quickly decrease to the grid demand power P AGC Among them, when P Be2 When P is positive, it indicates that the energy storage device is discharging at that power; when P is positive, it indicates that the energy storage device is discharging at that power. Be2 When the value is negative, it indicates that the energy storage device is charging at that power.

[0196] Continue to refer to Figure 9 During the time interval from t3 to t4, the thermal power unit is in a steady-state phase, at which time the current load power P G Approximately the grid demand power P AGC And the power demand P of the power grid AGC With current load power P G The deviation between them is less than or equal to the dead zone power threshold P.D Therefore, in (P) G ≥P AGC -P D )∩(P AGC >P G0 Under the condition that the current load power P G Slightly lower than the grid demand power P AGC The charging and discharging power P of the energy storage device Be3 For P AGC -P G This allows the energy storage device to discharge a small amount to compensate for the current load power P. G Power demand P of the power grid AGC The power difference between them improves the regulation accuracy K2 of the thermal power unit. Furthermore, in (P G ≤P AGC +P D )∩(P AGC <P G0 Under the condition that the current load power P G Slightly higher than the grid demand power P AGC The charging and discharging power P of the energy storage device Be3 For P AGC -P G This allows the energy storage device to be charged in small amounts to supplement the excess power absorbed by the thermal power unit, thereby eliminating small fluctuations in the power generation of the thermal power unit and maintaining the stability of the combined power output of the thermal power-storage system. Specifically, when P... Be3 When P is positive, it indicates that the energy storage device is discharging at that power; when P is positive, it indicates that the energy storage device is discharging at that power. Be3 When the value is negative, it indicates that the energy storage device is charging at that power.

[0197] Furthermore, the controller can control the charging and discharging power of the energy storage device according to the frequency regulation charging and discharging formula, enabling the energy storage device to quickly provide power support according to the frequency regulation charging and discharging formula during the ramp-up phase, shortening the ramp-up time of the thermal power unit and thus significantly improving the regulation rate K1 of the thermal power unit. The energy storage device can eliminate small fluctuations in the current power generation of the thermal power unit according to the charging and discharging formula during the steady-state phase, allowing the combined power of the thermal power and energy storage system to more accurately match the power demand of the grid, thereby improving the regulation accuracy K2 of the thermal power unit. The energy storage device can rapidly charge and discharge according to the charging and discharging formula during the response phase, quickly pulling the thermal power unit out of the dead zone, shortening the time for the thermal power unit to reach a significant power change from the frequency regulation command, thereby improving the response time K3 of the thermal power unit. By improving the regulation rate K1, regulation accuracy K2, and response time K3 of the thermal power unit through the energy storage device, the comprehensive frequency regulation performance K = k1*k2*k3 of the thermal power unit is significantly improved, enabling the combined power of the thermal power and energy storage system to quickly match the power demand of the grid, effectively maintaining the stability of the grid frequency, and improving the economy and reliability of the thermal power and energy storage system.

[0198] Specifically, when the charging power of the energy storage device is negative and the discharging power is positive, the power generation of the thermal power unit can be equal to the sum of the grid demand power and the charging or discharging power of the energy storage device. Thus, by using the charging / discharging power of the energy storage device and the grid demand power, the power generation of the thermal power unit can be determined. This allows the energy storage device and the thermal power unit to jointly regulate the frequency of the thermal-energy storage system. The rapid charging and discharging capability of the energy storage device compensates for the slow regulation of the thermal power unit, enabling the combined power of the thermal-energy storage system to quickly match the grid demand power, effectively maintaining grid frequency stability and achieving both economic benefits and meeting the grid's power supply needs.

[0199] In this embodiment, by acquiring the frequency regulation parameters of the thermal power unit and the energy storage system in real time under frequency regulation mode, the power generation of the thermal power unit and the charging and discharging power of the energy storage device can be controlled according to the frequency regulation parameters. This allows for real-time adjustment of the power generation based on the grid demand when the load power of the thermal power unit deviates from the grid demand power. By acquiring the grid demand power, the initial load power of the thermal power unit, the current load power of the thermal power unit, and the dead zone power threshold of the thermal power unit, the current frequency regulation stage of the thermal power unit is determined based on the grid demand power, initial load power, current load power, and dead zone power threshold. Based on the current frequency regulation stage, the current frequency regulation charging and discharging formula is determined, thereby controlling the charging and discharging power of the energy storage device according to the frequency regulation charging and discharging formula. This enables the energy storage device to improve the regulation rate, regulation accuracy, and response time of the thermal power unit, significantly improving the overall frequency regulation performance of the thermal power unit and allowing the combined power of the thermal power and energy storage system to quickly match the grid demand power, effectively maintaining grid frequency stability. Furthermore, by controlling the power generation of thermal power units based on the charging and discharging power of energy storage devices and the power demand of the power grid, the energy storage devices and thermal power units can jointly regulate the frequency of the thermal power-storage system. The rapid charging and discharging capability of the energy storage devices compensates for the slow regulation of thermal power units, thus achieving the goal of meeting the power supply demand of the power grid while ensuring economic benefits.

[0200] Example 7

[0201] Figure 10 This is a flowchart illustrating a control method for a fire storage system according to Embodiment 7 of the present invention. This embodiment supplements the control method for the fire storage system based on the above embodiments. Correspondingly, as shown... Figure 10 As shown, the control method for this fire storage system may include:

[0202] S601. Obtain the current operating mode of the fire storage system.

[0203] The operating modes include peak shaving mode and frequency regulation mode.

[0204] S602, when an operation mode switching instruction of the thermal-storage system is obtained, obtaining the current power change direction of the thermal power unit in the current operation mode and the power change direction to be adjusted of the thermal power unit in the to-be-switched operation mode.

[0205] S603, when the current power change direction is the same as the power change direction to be adjusted, controlling the thermal-storage system to operate in a frequency modulation mode.

[0206] S604, when controlling the energy storage device to perform charging and discharging, obtaining the remaining electric quantity of the energy storage device and the rated charging and discharging power of the energy storage device in real time.

[0207] Specifically, when the energy storage device in the thermal-storage system frequently responds to peak regulation and frequency modulation instructions, its SOC will fluctuate accordingly. Specifically, SOC can be understood as the percentage of the remaining electric quantity of the energy storage device in the total capacity of the energy storage device. Due to the limited capacity of the energy storage device, if the SOC is too high or too low, the energy storage device may be unable to continue charging or discharging, thereby affecting the comprehensive frequency modulation performance or peak regulation economy of the thermal power unit. Therefore, when controlling the energy storage device to perform charging and discharging, the controller can also obtain the remaining electric quantity of the energy storage device and the rated charging and discharging power of the energy storage device in real time, so as to realize real-time monitoring of the SOC of the energy storage device, and dynamically adjust the current charging and discharging power of the energy storage device, to ensure that the SOC of the energy storage device is maintained within a reasonable range.

[0208] S605, controlling the current charging and discharging power of the energy storage device according to the current remaining electric quantity of the energy storage device and the rated charging and discharging power.

[0209] Specifically, Figure 11 is a schematic diagram of a charging and discharging power limiting function of an energy storage device provided by the seventh embodiment of the present invention. The controller can realize real-time monitoring of the SOC of the energy storage device according to the current remaining electric quantity of the energy storage device and the rated charging and discharging power, and dynamically adjust the current charging and discharging power of the energy storage device in combination with a preset charging and discharging power limiting function of the energy storage device, to ensure that the SOC of the energy storage device is maintained within a reasonable range, thereby ensuring the continuous and efficient operation of the thermal-storage system.

[0210] As shown in Figure 11 , when the energy storage device is being charged and the SOC of the energy storage device satisfies the condition of 0%≤SOC≤80%, the energy storage device all adopts the rated charging and discharging power P n to perform charging. Since the SOC of the energy storage device is relatively low, the energy storage device has enough capacity to accept the charging amount; when the SOC of the energy storage device satisfies the condition of 80%<SOC≤100%, the charging power of the energy storage device will follow the quadratic function 25SOC 2-50SOC+25 gradually decreases. When SOC=100%, the charging power of the energy storage device drops to 0, thereby preventing overcharging of the energy storage device and prolonging the service life of the energy storage device. When the energy storage device is discharging, if the SOC of the energy storage device satisfies the condition of 0%<SOC<10%, the discharge power of the energy storage device is 0, so as to prevent damage to the energy storage device caused by over-discharging when the remaining power of the energy storage device is low; when the SOC of the energy storage device satisfies the condition of 10%≤SOC≤30%, the discharge power of the energy storage device follows the quadratic function 25SOC 2 -5SOC+0.25 increases gradually, so that the discharging capacity of the energy storage device can be gradually restored when the SOC of the energy storage device is low, and the discharging power of the energy storage device is gradually restored from 0 to the rated charging and discharging power P n , meanwhile avoiding power exhaustion of the energy storage device caused by rapid discharging; when the SOC of the energy storage device satisfies 30%<SOC≤100%, the SOC of the energy storage device is sufficient, and the energy storage device all operates at the rated charging and discharging power P n for discharging, so as to compensate for the slow regulation of thermal power units through the rapid charging and discharging capacity of the energy storage device, thereby meeting the power supply demand of the power grid while ensuring economic benefits.

[0211] In this embodiment, when controlling the charging and discharging of the energy storage device, the remaining power of the energy storage device and the rated charging and discharging power of the energy storage device are acquired in real time, so as to control the current charging and discharging power of the energy storage device according to the current remaining power and the rated charging and discharging power of the energy storage device, thereby dynamically adjusting the current charging and discharging power of the energy storage device, ensuring that the SOC of the energy storage device is maintained within a reasonable range, guaranteeing the continuous and efficient operation of the thermal-energy storage system, and compensating for the slow regulation of thermal power units through the rapid charging and discharging capacity of the energy storage device, thereby meeting the power supply demand of the power grid while ensuring economic benefits.

[0212] Example 8

[0213] Figure 12 is a structural schematic diagram of a control device for a thermal-energy storage system provided by Example 8 of the present invention. The device can implement the control method for the thermal-energy storage system provided by the embodiments of the present invention, and the device can be implemented by means of software and / or hardware, and is generally integrated in the controller of the thermal-energy storage system. As shown in Figure 12 , the device comprises: an operation mode acquisition module 701, a power change direction acquisition module 702, and an operation mode switching module 703. The specific structure of the device is as follows:

[0214] the operation mode acquisition module 701 is configured to acquire the current operation mode of the thermal-energy storage system; the operation modes include a peak shaving mode and a frequency regulation mode.

[0215] The power change direction acquisition module 702 is used to acquire the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched when the thermal power storage system operation mode switching command is received.

[0216] In peak shaving mode, the power change direction includes the forward peak shaving power change direction and the reverse peak shaving power change direction; in frequency modulation mode, the power change direction includes the forward frequency modulation power change direction and the reverse frequency modulation power change direction.

[0217] The operating mode switching module 703 is used to control the fire storage system to operate in frequency regulation mode when the current power change direction is the same as the power change direction to be regulated.

[0218] In an optional embodiment of the present invention, the operating mode switching module 703 may also be used to: when the current power change direction is different from the power change direction to be adjusted, obtain the comprehensive peak-shaving benefit in peak-shaving mode and the comprehensive frequency regulation benefit in frequency regulation mode; when the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency regulation benefit, control the thermal energy storage system to operate in frequency regulation mode.

[0219] In an optional embodiment of the present invention, the operating mode switching module 703 can also be used to: control the thermal energy storage system to operate in peak shaving mode when the comprehensive peak shaving benefit is greater than the comprehensive frequency regulation benefit.

[0220] In an optional embodiment of the present invention, the operating mode acquisition module 701 can also be used to: acquire the peak shaving parameters of the thermal power unit and the charging and discharging power of the energy storage device in real time under peak shaving mode; and control the power generation of the thermal power unit and the charging and discharging power of the energy storage device according to the peak shaving parameters.

[0221] The peak-shaving parameters include the grid electricity price and the charging and discharging benchmark value.

[0222] In an optional embodiment of the present invention, the operating mode acquisition module 701 may also be used to: construct a peak-shaving charge-discharge function based on the grid electricity price and the charge-discharge benchmark value; control the charge-discharge power of the energy storage device based on the peak-shaving charge-discharge function; and control the power generation of the thermal power unit based on the charge-discharge power of the energy storage device and the winning bid power of the thermal power storage system.

[0223] The peak-shaving charge / discharge function includes the peak-shaving charge function and the peak-shaving discharge function:

[0224] The peak-shaving charging function is:

[0225]

[0226] Among them, P 充denoted as , where is the current charging power of the energy storage device, x is the real-time electricity price of the grid, Pn is the rated charging and discharging power of the energy storage device, k1 and C1 are both charging coefficients, and b is the benchmark charging price.

[0227] The peak-shaving discharge function is:

[0228]

[0229] Among them, P 放 Let be the current discharge power of the energy storage device, x be the real-time electricity price of the grid, Pn be the rated charging and discharging power of the energy storage device, k2 and C2 be the discharge coefficients, and c be the discharge benchmark electricity price.

[0230] In an optional embodiment of the present invention, the operating mode acquisition module 701 may also be used to: acquire the winning bid power and the economic range of the power generation of the thermal energy storage system before the thermal energy storage system enters the peak shaving mode; acquire the operating condition information of the energy storage device when the winning bid power is within the economic range of the power generation; and control the thermal energy storage system to enter the peak shaving mode when it is determined that the energy storage device meets the conditions for commissioning based on the operating condition information of the energy storage device.

[0231] In an optional embodiment of the present invention, the operating mode acquisition module 701 can also be used to: control the energy storage device to be in standby mode when the winning bid power is not within the economic range of power generation, or when the operating condition system of the energy storage device determines that the energy storage device does not meet the conditions for commissioning, and control the thermal power unit to generate electricity at the winning bid power.

[0232] Among them, the lower limit of the economic range of power generation for the thermal power storage system is P. min The upper limit of power is P max ;in:

[0233] P min =MAX{P Gmin -P ec P Gmin -P allow1};

[0234] P max =MIN{P Gmax +P ed P Gmax +P allow2};

[0235] Among them, P Gmin P is the minimum generating capacity of a thermal power unit. Gmax P represents the maximum generating capacity of the thermal power unit. ec P is the rated charging power of the energy storage device. ed P is the rated discharge power of the energy storage device. allow1P is the lower limit of the permissible power generation capacity of the thermal energy storage system. allow2 This is the upper limit of the permissible power generation capacity of the thermal energy storage system.

[0236] In an optional embodiment of the present invention, the operating mode acquisition module 701 can also be used to: acquire the frequency regulation parameters of the thermal power unit and the charging and discharging power of the energy storage device in real time in frequency regulation mode; and control the power generation of the thermal power unit and the charging and discharging power of the energy storage device according to the frequency regulation parameters.

[0237] The frequency regulation parameters include the grid demand power, the load power of thermal power units, and the dead zone power threshold of thermal power units.

[0238] In an optional embodiment of the present invention, the operating mode acquisition module 701 may also be used to: construct a frequency regulation charging and discharging formula based on the grid demand power, the initial load power of the thermal power unit, the current load power of the thermal power unit and the dead zone power threshold; and control the charging and discharging power of the energy storage device and the power generation power of the thermal power unit based on the frequency regulation charging and discharging formula.

[0239] In an optional embodiment of the present invention, the operating mode acquisition module 701 may also be used to: determine the current frequency regulation stage of the thermal power unit based on the grid demand power, initial load power, current load power and dead zone power threshold; the frequency regulation stage includes a response stage, a ramp-up stage and a steady-state stage; and determine the current frequency regulation charging and discharging formula based on the current frequency regulation stage of the thermal power unit.

[0240] During the response phase, the frequency modulation charging and discharging formula is as follows:

[0241]

[0242] During the ramp-up phase, the frequency-modulated charging and discharging formula is:

[0243]

[0244] In the steady-state phase, the formula for frequency-modulated charging and discharging is:

[0245]

[0246] Among them, P Be1 To determine the charging and discharging power of the energy storage device during the response phase, P Be2 P represents the charging and discharging power of the energy storage device during the ramp-up phase. Be3 P represents the charging and discharging power of the energy storage device during the steady-state phase. AGC P is the power demand of the power grid. G0 P is the initial load power. G P represents the current load power. D This is the dead zone power threshold.

[0247] In an optional embodiment of the present invention, the operating mode acquisition module 701 may also be used to: acquire the remaining power of the energy storage device and the rated charging and discharging power of the energy storage device in real time when controlling the energy storage device to charge and discharge; and control the current charging and discharging power of the energy storage device according to the current remaining power and rated charging and discharging power of the energy storage device.

[0248] The control device for the fire storage system described above can execute the control method for the fire storage system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the method. Technical details not described in detail in this embodiment can be found in the control method for the fire storage system provided in any embodiment of the present invention.

[0249] Since the control device for the fire storage system described above is capable of executing the control method for the fire storage system in the embodiments of the present invention, those skilled in the art can understand the specific implementation and various variations of the control device for the fire storage system in this embodiment based on the control method for the fire storage system described in the embodiments of the present invention. Therefore, how the control device for the fire storage system implements the control method for the fire storage system in the embodiments of the present invention will not be described in detail here. Any device used by those skilled in the art to implement the control method for the fire storage system in the embodiments of the present invention falls within the scope of protection of this application.

[0250] Example 9

[0251] Figure 13 A schematic diagram of a controller for implementing the control method of a thermal power generation and energy storage system according to embodiments of the present invention is shown. The controller can take various forms to suit the internal environment and requirements of the thermal power generation and energy storage system, such as industrial computers, embedded controllers, intelligent control terminals, distributed control systems, and dedicated control units. These devices are specifically designed to monitor and regulate the operating status of the thermal power generation and energy storage system, coordinating the power generation of the thermal power unit and the charging and discharging power of the energy storage device to meet the power supply requirements of the power grid while ensuring economic efficiency. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0252] like Figure 13As shown, the controller 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the controller 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0253] Multiple components in the controller 10 are connected to the I / O interface 15, including: an input unit 16, such as an operation panel or sensor acquisition module of the fire storage system; an output unit 17, such as a display screen, status indicator light, or alarm system of the fire storage system; a storage unit 18, such as a hard disk or solid-state memory of the fire storage system; and a communication unit 19, such as a communication module, Ethernet, or industrial bus interface of the fire storage system. The communication unit 19 allows the controller 10 to exchange information / data with other devices through a network such as the internal network of the fire storage system and / or a communication system.

[0254] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as control methods for a fire storage system.

[0255] In some embodiments, the control method for the fire storage system can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as a storage unit. In some embodiments, part or all of the computer program can be loaded and / or installed onto the fire storage system of the above embodiments via ROM and / or a communication unit. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the control method for the fire storage system described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the control method for the fire storage system by any other suitable means (e.g., by means of firmware).

[0256] Optionally, a control method for a thermal power generation and storage system may include: acquiring the current operating mode of the thermal power generation and storage system; the operating mode includes peak shaving mode and frequency regulation mode; when acquiring a thermal power generation and storage system operating mode switching command, acquiring the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched; when the current power change direction and the power change direction to be adjusted are the same, controlling the thermal power generation and storage system to operate in frequency regulation mode.

[0257] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0258] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0259] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0260] To provide user interaction, the systems and techniques described herein can be implemented on a controller having: a fire storage system display device (e.g., a monitoring screen for the fire storage system) for displaying information to the user; and a fire storage system input unit (e.g., an operation panel, buttons, or touchscreen for the fire storage system) through which the user can provide input to the controller. Other types of devices can also be used to provide user interaction; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0261] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0262] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0263] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this invention can be achieved, and this is not limited herein.

[0264] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method of a fire storage system, characterized by, The thermal power unit and energy storage system include thermal power units and energy storage equipment, and the control method of the thermal power unit includes: Obtain the current operating mode of the fire storage system; the operating mode includes peak shaving mode and frequency regulation mode; When the operating mode switching command of the thermal power storage system is obtained, the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched are obtained. The power change direction under the peak shaving mode includes a positive peak shaving power change direction and a reverse peak shaving power change direction; the positive peak shaving power change direction is the direction of change from the valley price range to the peak price range of the power grid; the reverse peak shaving power change direction is the direction of change from the peak price range to the valley price range of the power grid. The power change direction in the frequency regulation mode includes a forward frequency regulation power change direction and a reverse frequency regulation power change direction; the forward frequency regulation power change direction is the power change direction when the grid demand power is greater than the load power of the thermal power unit; the reverse frequency regulation power change direction is the power change direction when the grid demand power is less than the load power of the thermal power unit. When the current power change direction is the same as the power change direction to be adjusted, the fire storage system is controlled to operate in the frequency regulation mode; when the current power change direction is different from the power change direction to be adjusted, the comprehensive peak-shaving benefit in the peak-shaving mode and the comprehensive frequency regulation benefit in the frequency regulation mode are obtained. When the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency regulation benefit, the thermal energy storage system is controlled to operate in the frequency regulation mode; when the comprehensive peak-shaving benefit is greater than the comprehensive frequency regulation benefit, the thermal energy storage system is controlled to operate in the peak-shaving mode.

2. The control method of the fire storage system according to claim 1, characterized by, Also includes: In the peak-shaving mode, the peak-shaving parameters of the fire storage system are acquired in real time; The power generation of the thermal power unit and the charging and discharging power of the energy storage device are controlled according to the peak-shaving parameters.

3. The control method of a fire storage system according to claim 2, characterized by, The peak-shaving parameters include the mains electricity price and the charging / discharging benchmark value; Controlling the power generation of the thermal power unit and the charging and discharging power of the energy storage device according to the peak-shaving parameters includes: Based on the aforementioned mains electricity price and charging / discharging benchmark values, a peak-shaving charging / discharging function is constructed; The charging and discharging power of the energy storage device is controlled according to the peak-shaving charging and discharging function; The power generation of the thermal power unit is controlled based on the charging and discharging power of the energy storage device and the winning bid power of the thermal power storage system.

4. The control method of a fire storage system according to claim 3, characterized by, The peak-shaving charge / discharge function includes a peak-shaving charge function and a peak-shaving discharge function: The peak-shaving charging function is: wherein P 充 is the current charging power of the energy storage device, x is the real-time electricity price of the power grid, Pn is the charging and discharging rated power of the energy storage device, k1 and C1 are both charging coefficients, and b is a charging reference electricity price. The peak-shaving discharge function is: wherein P 放 is the current discharge power of the energy storage device, x is the real-time electricity price of the power grid, Pn is the charge-discharge rated power of the energy storage device, k2 and C2 are both discharge coefficients, and c is a discharge reference electricity price.

5. The control method for a fire storage system according to claim 1, characterized in that, Before the fire storage system enters the peak-shaving mode, it also includes: Obtain the winning bid power of the thermal energy storage system and the economic range of the power generation power of the thermal energy storage system; When the winning bid power is within the economic range of the power generation, the operating status information of the energy storage device is obtained; When it is determined that the energy storage device meets the conditions for commissioning based on the operating condition information of the energy storage device, the fire storage system is controlled to enter the peak shaving mode.

6. The control method for a fire storage system according to claim 5, characterized in that, Also includes: If the awarded power is not within the economic range of the power generation capacity, or if the energy storage device does not meet the conditions for commissioning according to the operating condition system of the energy storage device, the energy storage device is controlled to be in standby mode, and the thermal power unit is controlled to generate electricity at the awarded power.

7. The control method for a fire storage system according to claim 5, characterized in that, The lower limit of the economic range for the power generation capacity of the thermal energy storage system is... The upper limit of power is ;in: in, This represents the minimum generating capacity of the thermal power unit. This represents the maximum generating capacity of the thermal power unit. The rated charging power of the energy storage device. The rated discharge power of the energy storage device. This is the lower limit of the allowable power generation capacity of the thermal energy storage system. This represents the upper limit of the allowable power generation capacity of the fire-storage system.

8. The control method for a fire storage system according to claim 1, characterized in that, Also includes: In the frequency modulation mode, the frequency modulation parameters of the fire storage system are acquired in real time; The power generation of the thermal power unit and the charging and discharging power of the energy storage device are controlled according to the frequency regulation parameters.

9. The control method for a fire storage system according to claim 8, characterized in that, The frequency regulation parameters include the grid demand power, the load power of the thermal power unit, and the dead zone power threshold of the thermal power unit; Controlling the power generation of the thermal power unit and the charging and discharging power of the energy storage device according to the frequency regulation parameters includes: Based on the power demand of the power grid, the initial load power of the thermal power unit, the current load power of the thermal power unit, and the dead zone power threshold, a frequency regulation charging and discharging formula is constructed. The charging and discharging power of the energy storage device and the power generation power of the thermal power unit are controlled according to the frequency regulation charging and discharging formula.

10. The control method for a fire storage system according to claim 9, characterized in that, Based on the power demand of the power grid, the initial load power, the current load power, and the dead zone power threshold, a frequency regulation charging and discharging formula is constructed, including: The frequency regulation stage of the thermal power unit is determined based on the power demand of the power grid, the initial load power, the current load power, and the dead zone power threshold; the frequency regulation stage includes a response stage, a ramp-up stage, and a steady-state stage. Based on the current frequency regulation stage of the thermal power unit, determine the current frequency regulation charging and discharging formula; During the response phase, the frequency-modulated charging and discharging formula is as follows: During the climbing phase, the frequency-modulated charging and discharging formula is as follows: During the steady-state phase, the frequency-modulated charging and discharging formula is as follows: in, The charging and discharging power of the energy storage device during the response phase. The charging and discharging power of the energy storage device during the ramp-up phase. The charging and discharging power of the energy storage device during the steady-state phase is [not specified]. The power demand of the power grid, The initial load power, The current load power, The dead zone power threshold is defined as follows.

11. The control method for a fire storage system according to claim 1, characterized in that, Also includes: When controlling the energy storage device to charge and discharge, the remaining power of the energy storage device and the rated charging and discharging power of the energy storage device are obtained in real time. The current charging and discharging power of the energy storage device is controlled based on the current remaining power of the energy storage device and the rated charging and discharging power.

12. A control device for a fire storage system, used to execute the control method for a fire storage system as described in any one of claims 1-11, characterized in that, The thermal power unit and energy storage system include thermal power units and energy storage equipment, and the control device of the thermal power unit includes: The operation mode acquisition module is used to acquire the current operation mode of the fire storage system; the operation mode includes peak shaving mode and frequency regulation mode. The power change direction acquisition module is used to acquire the current power change direction of the thermal power unit in the current operating mode and the power change direction to be adjusted of the thermal power unit in the operating mode to be switched when the thermal power storage system operation mode switching instruction is received. The operation mode switching module is used to control the fire storage system to operate in the frequency regulation mode when the current power change direction is the same as the power change direction to be adjusted.

13. A fire storage system, characterized in that, include: Thermal power units, energy storage equipment and controllers; The controller is connected to the thermal power unit and the energy storage device respectively, and the controller is used to execute the control method of the thermal power storage system according to any one of claims 1-11.

14. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the control method of the fire storage system according to any one of claims 1-11.

Images