Fire storage system, control method and device thereof and medium

Abstract

The invention provides a fire storage system, a control method and device thereof and a medium, and relates to the technical field of power systems. The control method of the fire storage system comprises the steps of obtaining a current operation mode of the fire storage system; the operation mode comprises a peak regulation mode and a frequency modulation mode; when a fire storage system operation mode switching instruction is obtained, the current power change direction of the thermal power generating unit in the current operation mode and the to-be-adjusted power change direction of the thermal power generating unit in the to-be-switched operation mode are obtained; and when the current power change direction is the same as the to-be-adjusted power change direction, controlling the fire storage system to operate in a frequency modulation mode. By coordinately controlling the peak regulation mode and the frequency modulation mode of the fire storage system, economic benefits are guaranteed, and the power supply requirement of a power grid is met.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of power systems, and in particular to a thermal storage system and a control method, device, and medium thereof. Background Art

[0002] As a crucial component of traditional power systems, thermal power units are widely used to meet the grid's baseload supply and regulation needs. With the increasing penetration of renewable energy and the advancement of power marketization, thermal power units need to have more flexible operating capabilities to meet grid stability requirements.

[0003] In the existing technology, to compensate for the slow response problem 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-regulating capabilities of the thermal power units.

[0004] However, the control strategies for thermal storage systems in the prior art are typically designed solely for peak shaving or frequency regulation, failing to coordinate the simultaneous operation of these two tasks. For example, when a thermal storage system faces both peak shaving and frequency regulation demands, the lack of a unified control strategy prevents it from optimizing resource allocation based on overall benefits. This single-minded control approach limits the adaptability and cost-effectiveness of thermal storage systems under complex operating conditions. Summary of the Invention

[0005] The present invention provides a thermal storage system and a control method, device and medium thereof, which coordinate and control the peak-shaving mode and frequency-regulating mode of the thermal storage system to meet the power supply demand of the power grid while ensuring economic benefits.

[0006] A first aspect of the present invention provides a control method for a thermal storage system, wherein the thermal storage system includes a thermal power unit and an energy storage device. The control method for the thermal storage system includes:

[0007] Obtaining a current operating mode of the thermal storage system; the operating mode includes a peak regulation mode and a frequency regulation mode;

[0008] When the thermal storage system operation mode switching instruction is obtained, the current power change direction of the thermal power unit in the current operation mode and the to-be-adjusted power change direction of the thermal power unit in the to-be-switched operation mode are obtained;

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

[0010] Optionally, the control method of the fire storage system further includes:

[0011] When the current power change direction is different from the power change direction to be adjusted, obtaining a comprehensive peak regulation benefit in the peak regulation mode and a comprehensive frequency regulation benefit in the frequency regulation mode;

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

[0013] Optionally, the control method of the fire storage system further includes:

[0014] When the comprehensive benefit of peak regulation is greater than the comprehensive benefit of frequency regulation, the thermal storage system is controlled to operate in the peak regulation 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 a direction from the valley price interval to the peak price interval of the mains power grid; the reverse peak shaving power change direction is a direction from the peak price interval to the valley price interval of the mains power grid;

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

[0017] Optionally, the control method of the fire storage system further includes:

[0018] In the peak-shaving mode, obtaining peak-shaving parameters of the thermal storage system in real time;

[0019] According to the peak-shaving parameters, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled.

[0020] Optionally, the peak-shaving parameters include the mains electricity price and the charge and discharge reference value;

[0021] According to the peak-shaving parameters, controlling the power generation power of the thermal power unit and the charge and discharge power of the energy storage device includes:

[0022] Constructing a peak-shaving charge and discharge function according to the city electricity price and the charge and discharge reference value;

[0023] Controlling the charge and discharge power of the energy storage device according to the peak-shaving charge and discharge function;

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

[0025] Optionally, the peak-shaving charge and 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 is the current charging power of the energy storage device, 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 is the current discharge power of the energy storage device, x is the real-time electricity price of the grid, Pn is the rated charge and discharge power of the energy storage device, k2 and C2 are both discharge coefficients, and c is the discharge benchmark electricity price.

[0032] Optionally, before the thermal storage system enters the peak shaving mode, the method further includes:

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

[0034] When the winning bid power is within the economic range of generated power, obtaining operating condition information of the energy storage device;

[0035] When it is determined according to the operating condition information of the energy storage device that the energy storage device meets the conditions for being put into use, the thermal storage system is controlled to enter the peak-shaving mode.

[0036] Optionally, the control method of the fire storage system further includes:

[0037] When the winning bid power is not within the economic range of power generation, or when the system determines, based on the operating condition of the energy storage device, that the energy storage device does not meet the conditions for being put into use, the energy storage device is controlled to be in a standby state, and the thermal power unit is controlled to generate electricity at the winning bid power.

[0038] Optionally, the power lower limit of the power economic range of the thermal storage system is P min , the power upper limit 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 is the minimum power generation capacity of the thermal power unit, P Gmax is the maximum power generation power of the thermal power unit, P ec is the rated charging power of the energy storage device, P ed is the rated discharge power of the energy storage device, P allow1 is the lower limit of the power generation capacity of the thermal storage system, P allow2 The upper limit of the power generation capacity of the thermal storage system is allowed.

[0042] Optionally, the control method of the fire storage system further includes:

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

[0044] According to the frequency modulation parameters, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled.

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

[0046] Controlling the power generation power of the thermal power unit and the charge and discharge power of the energy storage device according to the frequency modulation parameters includes:

[0047] Constructing a frequency regulation charging and discharging formula according to 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;

[0048] According to the frequency modulation charging and discharging formula, the charging and discharging power of the energy storage device and the generating power of the thermal power unit are controlled.

[0049] Optionally, a frequency modulation charging and discharging formula is constructed according to the grid demand power, the initial load power, the current load power, and the dead zone power threshold, including:

[0050] Determining the frequency regulation stage currently in which the thermal power unit is located according to the grid demand power, 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] Determining a current frequency regulation charging and discharging formula according to the current frequency regulation stage of the thermal power unit;

[0052] Among them, in the response stage, the frequency modulation charging and discharging formula is:

[0053]

[0054] In the ramp-up phase, the frequency modulation charging and discharging formula is:

[0055]

[0056] In the steady-state stage, the frequency modulation charging and discharging formula is:

[0057]

[0058] Among them, P Be1 is the charge and discharge power of the energy storage device in the response stage, P Be2 is the charge and discharge power of the energy storage device during the ramp phase, P Be3 is the charge and discharge power of the energy storage device in the steady state stage, P AGC is the power demanded by the grid, P G0 is the initial load power, P G is the current load power, P D is the dead zone power threshold.

[0059] Optionally, the control method of the fire storage system further includes:

[0060] When controlling the energy storage device to charge and discharge, obtaining the remaining power of the energy storage device and the rated charge and discharge power of the energy storage device in real time;

[0061] The current charge and discharge power of the energy storage device is controlled according to the current remaining power of the energy storage device and the rated charge and discharge power.

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

[0063] An operation mode acquisition module is used to obtain the current operation mode of the thermal storage system; the operation mode includes a peak regulation mode and a frequency regulation mode;

[0064] a power change direction acquisition module, configured to acquire, upon obtaining an instruction to switch the operation mode of the thermal storage system, a current power change direction of the thermal power unit in the current operation mode and a power change direction to be adjusted of the thermal power unit in the operation mode to be switched;

[0065] An operation mode switching module is used to control the thermal storage system to operate in the frequency modulation 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 energy storage system, comprising: a thermal power unit, an energy storage device, and a controller;

[0067] The controller is connected to the thermal power unit and the energy storage device respectively, and is used to execute the control method of the thermal 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, and the computer instructions are used to enable a processor to implement the control method of the fire storage system as described above when executed.

[0069] The technical solution of the present invention enables the operation mode of the thermal storage system to include a peak shaving mode and a frequency regulation mode, so that in the peak shaving mode, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device can be controlled according to the city electricity price and the charge and discharge reference value, so that the thermal storage system can reduce losses and store energy when the electricity price is low, and discharge to increase profits when the electricity price is high, thereby maximizing the utilization of the peak-valley electricity price difference. At the same time, the rapid charge and discharge capability of the energy storage device makes up for the deficiency of the slow regulation of the thermal power unit, so that the thermal storage system can respond more flexibly to changes in the city electricity price; in the frequency regulation mode, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled according to the power demand of the power grid and the real-time load power of the thermal power unit, so that the combined power of the thermal storage system can quickly match the power demand of the power grid, thereby maintaining the stable operation of the power grid frequency. In addition, by obtaining the current operating mode of the thermal storage system, it is possible to determine in which mode the thermal storage system is currently operating, thereby executing the corresponding control strategy to meet the needs of the power grid and the economic efficiency of the thermal storage system; at the same time, when the thermal storage system operating mode switching instruction 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, so that when the current power change direction is the same as the power change direction to be adjusted, the thermal storage system is controlled to operate in the frequency regulation mode, so that when the frequency regulation mode and the peak regulation mode are intended to adjust the power generation direction of the thermal power unit in the same direction, the thermal storage system is preferentially controlled to operate in the frequency regulation mode to ensure that the combined power of the thermal storage system can meet the real-time power supply demand of the power grid, thereby improving the accuracy of regulating the power generation power of the thermal power unit and the charging and discharging power of the energy storage device. The technical solution of the present invention, through the coordinated control of the comprehensive peak regulation mode and the frequency regulation mode of the thermal storage system, achieves the goal of meeting the power supply demand of the power grid while ensuring economic benefits.

[0070] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0073] Figure 2 1 is a flow chart of a control method for a fire storage system provided in the second embodiment of the present invention;

[0074] Figure 3 1 is a flow chart of a control method for a fire storage system provided in a third embodiment of the present invention;

[0075] Figure 4 1 is a flow chart of a method for controlling a thermal storage system in a peak-shaving mode provided by a fourth embodiment of the present invention;

[0076] Figure 5 Schematic diagram of a peak-shaving charging function of an energy storage device provided by the fourth embodiment of the present invention;

[0077] Figure 6 Schematic diagram of a peak-shaving discharge function of an energy storage device provided by the fourth embodiment of the present invention;

[0078] Figure 7 This is a flow chart of a method for controlling a thermal storage system in a peak-shaving mode provided by a fifth embodiment of the present invention;

[0079] Figure 8 1 is a flow chart of a method for controlling a thermal storage system in a frequency modulation mode provided by a sixth embodiment of the present invention;

[0080] Figure 9 A schematic diagram of a frequency modulation instruction response process of a fire storage system provided in Example 6 of the present invention;

[0081] Figure 10 1 is a flow chart of a control method for a fire storage system provided in Embodiment 7 of the present invention;

[0082] Figure 11 A schematic diagram of a charge and discharge power limit function of an energy storage device provided in Example 7 of the present invention;

[0083] Figure 12 This is a schematic structural diagram of a control device for a fire storage system provided by an eighth embodiment of the present invention;

[0084] Figure 13 This is a structural diagram of a controller of a fire storage system provided in Example 9 of the present invention. DETAILED DESCRIPTION

[0085] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0086] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0087] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0088] Example 1

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

[0090] Specifically, thermal power unit 1 can be understood as the primary power generation unit in the thermal-storage system. It utilizes coal, gas, or other fuels as its energy source, converting thermal energy into electricity through boilers, steam turbines, and generators. This provides stable baseload power and a certain degree of regulation capability to meet the grid's basic power supply needs. Furthermore, thermal power unit 1 can adjust its power generation capacity through peak shaving or frequency regulation to meet fluctuating power demand. However, its slow response speed makes it difficult to meet instantaneous regulation requirements.

[0091] Energy storage device 2 can be specifically understood as a device capable of storing electrical energy and releasing it when needed. For example, energy storage device 2 can utilize liquid or solid-state batteries, such as lithium batteries or lead-acid batteries. Energy storage device 2 can rapidly store and output electrical energy, thereby compensating for the responsiveness shortcomings of thermal power unit 1. This enables the thermal storage system to possess rapid and flexible peak-shaving and frequency-regulating capabilities, thereby improving its overall performance and economic efficiency.

[0092] It is understandable that the controller 3 in the thermal storage system is connected to the thermal power unit 1 and the energy storage device 2 respectively, so that the controller 3 can monitor the power 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 modulation mode to coordinate the power generation power of the thermal power unit 1 and the charge and discharge power of the energy storage device 2, so that the energy storage device 2 generates electricity to supplement the power generated by the thermal power unit 1, or part of the power generated by the thermal power unit 1 is used to charge the energy storage device 2, so that the overall output of the thermal storage system can meet the power demand of the power grid. The controller 3 can execute the control method of the thermal storage system provided in the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not fully described in this embodiment, please refer to the control method of the thermal storage system described in the embodiment below.

[0093] Example 2

[0094] Figure 2 This is a flow chart of a control method for a fire storage system provided by the second embodiment of the present invention. This embodiment can be used to control the fire storage system of the above embodiment. The method can be executed by a control device of the fire storage system. The device can be implemented by software and / or hardware and can generally be integrated into the controller of the fire storage system. Figure 2 As shown, the control method of the fire storage system may include:

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

[0096] The operating modes of thermal storage systems can include peak-shaving and frequency-regulating modes. In peak-shaving mode, the thermal storage system controls the power generation of thermal power units and the charge and discharge power of energy storage devices based on the utility price and charge and discharge benchmarks. Specifically, peak-shaving mode refers to an operating strategy in which the thermal storage system adjusts power generation to adapt to price fluctuations in the electricity market, thereby maximizing economic returns. With the introduction of the spot electricity market, thermal storage systems need to develop reasonable control strategies to match power generation at different time periods with real-time electricity prices. In frequency-regulating mode, the thermal storage system controls the power generation of thermal power units and the charge and discharge power of energy storage devices based on the power demand of the grid and the real-time load power of the thermal power units. Specifically, frequency-regulating mode refers to an operating strategy in which the thermal storage system rapidly adjusts the real-time load power of the thermal power units to respond to changes in the power demand of the grid, thereby maintaining a stable grid frequency. Frequency is a key indicator of supply and demand balance in power systems. When the load power of thermal power units deviates from the power demand of the grid, the thermal storage system adjusts power generation based on the real-time power demand of the grid.

[0097] In addition, the operating mode also includes a standby state in which neither peak shaving nor frequency regulation is performed when electricity prices are at valley or peak levels. This prevents inefficient operation of the thermal storage system and reduces equipment losses. For example, when electricity prices are low and there is no demand for frequency regulation, the thermal storage system can choose to suspend peak shaving operations to maintain the minimum stable operating power of the thermal power units and control the energy storage devices to stop charging. When electricity prices are high, but the thermal power units have reached maximum power and the energy storage devices are depleted, or there is no demand for frequency regulation, the thermal 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 storage system obtains the current operating mode of the thermal storage system in real time, laying the foundation for the subsequent controller to control the power generation power 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 storage system.

[0099] In an optional embodiment, when the controller determines that the current operating mode of the thermal storage system is the peak load mode, the controller will control the power generation power of the thermal power unit and the charge and discharge power of the energy storage device according to the city electricity price and the charge and discharge reference value. Among them, the charge and discharge reference value can be specifically understood as the economic critical point in the thermal storage system for determining whether the energy storage device is to be charged or discharged. The charge and discharge reference value can include a charging reference value and a discharging reference value. The charging reference value can be understood as the electricity price threshold at which the cost of charging the energy storage device can just be offset by the subsequent discharge income under the current electricity price. When it is lower than the charging reference value, charging is economical and can be profitable when discharging at high electricity prices in the future; when it is higher than the charging reference value, the charging cost is too high and it is not cost-effective. The discharge reference value can be understood as the electricity price threshold at which the energy storage device can realize profits by discharging under the current electricity price. Usually, the discharge reference value is higher than the charging reference value, and the difference between the two reflects the break-even point of the energy storage device.

[0100] For example, when the output of renewable energy is large or the electricity load is low, the city electricity price is usually low. For example, from 9:00 to 16:00 in the 24 hours of a day, renewable energy generates electricity in a concentrated manner, the power supply is greater than the demand of the power grid, the city electricity price is low, and the city electricity price is lower than the charging reference value, the thermal storage unit can reduce the power generation capacity, or charge through energy storage equipment to reduce the power generation of the thermal storage unit at low electricity prices, thereby reducing settlement losses, and may also obtain compensation income from deep peak regulation; when the city electricity price rises, for example, from 16:00 to 24:00 in the 24 hours of a day, the power generation of renewable energy decreases, and the electricity load demand increases, resulting in an increase in the city electricity price, and the city electricity price is higher than the discharge reference value, the thermal storage unit can increase the power generation capacity, or discharge through energy storage equipment to increase the power generation of the thermal storage unit at high electricity prices, so as to obtain higher settlement income and peak compensation.

[0101] By analyzing the renewable energy generation situation of the previous day or a period and the electricity demand of the load connected to the grid, the current peak price range and valley price range can be determined. When entering the valley price range from the peak price range, or vice versa, the thermal storage system needs to dynamically adjust the power generation of the thermal power units and the charge and discharge power of the energy storage equipment according to the mains electricity price and the charge and discharge benchmark value. This allows the thermal storage system to reduce losses and store energy when electricity prices are low, and discharge energy to increase profits when electricity prices are high, thus maximizing the utilization of the peak-valley price difference. In addition, the rapid charge and discharge capabilities of the energy storage equipment compensate for the slow regulation of the thermal power units, allowing the thermal storage system to respond more flexibly to changes in mains electricity prices.

[0102] In another optional embodiment, when the controller determines that the current operating mode of the thermal energy storage system is frequency modulation mode, the controller controls the power generation of the thermal energy storage system and the charge and discharge power of the energy storage device based on the power demand of the grid and the real-time load power of the thermal energy storage system. When the power demand of the grid is greater than the real-time load power of the thermal energy storage system, the controller controls the thermal energy storage system to increase its power generation and quickly discharge the energy storage device to compensate for the power shortfall caused by the slow response of the thermal energy storage system, allowing the combined power of the thermal energy storage system to quickly approach the power demand of the grid. When the power demand of the grid is less than the real-time load power of the thermal energy storage system, the controller controls the thermal energy storage system to reduce its power generation and charge the energy storage device to absorb the excess power, allowing the combined power of the thermal energy storage system to quickly drop to the power demand of the grid. By controlling the power generation of the thermal energy storage system and the charge and discharge power of the energy storage device based on the power demand of the grid and the real-time load power of the thermal energy storage system, the combined power of the thermal energy storage system can quickly match the power demand of the grid, effectively maintaining the stability of the grid frequency.

[0103] S102. When the thermal storage system operation mode switching instruction is obtained, the current power change direction of the thermal power unit in the current operation mode and the to-be-adjusted power change direction of the thermal power unit in the to-be-switched operation mode are obtained.

[0104] Among them, the switching instruction can be specifically understood as an instruction to switch the operation mode of the thermal storage system. For example, when the controller determines that the current operation mode of the thermal storage system is the peak-shaving mode, the switching instruction can be an instruction received by the controller that the power demand of the grid in the mains power grid has changed. At this time, the power demand of the grid may fluctuate significantly, and it is necessary to give priority to meeting the real-time power demand of the grid through the frequency modulation mode; when the controller determines that the current operation mode of the thermal storage system is the frequency modulation mode, the switching instruction can be an instruction received by the controller that the current operation time period will change between the peak price range and the valley price range. The thermal storage system needs to enter the peak-shaving mode at the current moment. At this time, the overall output power of the thermal storage system needs to meet the winning bid power allocated to the thermal storage system by the power grid. The winning bid power is usually a stable power value. The peak-shaving mode is used to optimize economic benefits. Without special limitations, the current operation mode of the thermal storage system is the peak-shaving mode, and the switching instruction is an instruction received by the controller that the power demand of the grid in the mains power grid has changed. For example, the embodiments of the present invention are explained exemplarily.

[0105] It can be understood that the current power change direction of the thermal power unit in the current operating mode can be that when operating in the current operating mode, the overall power generation power of the thermal storage system has an increasing or decreasing trend; the to-be-adjusted power change direction of the thermal power unit in the to-be-switched operating mode can be that when operating in the to-be-switched operating mode, the power generation power of the thermal power unit has an increasing or decreasing trend.

[0106] In an optional embodiment, the power change direction in the peak-shaving mode may include 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 from the valley price range of the utility grid to the peak price range. At this time, to adapt to the trend of increasing bid-winning power within the peak price range, the overall power generation power of the thermal storage system needs to be increased, that is, the power generation power of the thermal storage system will change in a positive direction. The reverse peak-shaving power change direction is the direction from the peak price range of the utility grid to the valley price range. At this time, to adapt to the trend of decreasing bid-winning power within the peak price range, the overall power generation power of the thermal storage system needs to be reduced, that is, the power generation power of the thermal storage system will change in a negative direction.

[0107] In another optional embodiment, the power change direction in the frequency modulation mode includes a forward frequency modulation power change direction and a reverse frequency modulation power change direction. The forward frequency modulation power change direction is the power change direction when the power demanded by the power grid is greater than the load power of the thermal power unit. At this time, to adapt to the power demanded by the power grid, the power generation power of the thermal power unit needs to be increased; the reverse frequency modulation power change direction is the power change direction when the power demanded by the power grid is less than the load power of the thermal power unit. At this time, to adapt to the power demanded by the power grid, the power generation power of the thermal power unit needs to be reduced.

[0108] Specifically, when the controller obtains the instruction to switch the operation mode of the thermal storage system, it can be known that the operation time period of the thermal storage system reaches the peak-shaving mode or that the power demand of the power grid has changed. At this time, in order to prevent the current operation mode from conflicting with the power generation adjustment direction of the thermal storage system in the operation mode to be switched, 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 operation mode to be switched can be obtained, and the current power change direction can be compared with the power change direction to be adjusted, thereby laying the foundation for subsequent control of the operation mode of the thermal storage system.

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

[0110] Specifically, by comparing the current power change direction with the power change direction to be adjusted, the controller can determine whether the current power change direction is the same as the power change direction to be adjusted. If the current power change direction is the same as the power change direction to be adjusted, it can be determined that the power generation power of the thermal storage system when operating in the current mode and the power generation power of the thermal power unit in the to-be-switched mode are both increasing or decreasing. At this time, the thermal storage system can be controlled to operate in a frequency modulation mode, so as to be able to control the power generation power change trend of the thermal power unit according to the power demand of the power grid and the real-time load of the thermal power unit, that is, the power demand of the power grid and the real-time power generation power of the thermal power unit, and control the charge and discharge state of the energy storage device, so that the overall power generation power of the thermal storage system can be equivalent to the power demand of the power grid, thereby preventing energy waste and ensuring the stability of the amount of electricity provided to the power grid.

[0111] For example, if the current operating mode is peak-shaving mode and the to-be-switched operating mode is frequency regulation mode, when the current power change direction is the same as the to-be-switched power change direction, by prioritizing frequency regulation mode, the combined power of the thermal power storage system can be rapidly adjusted based on the real-time grid demand power and thermal power unit load power to maintain grid frequency stability, ensuring that the grid's real-time power supply needs are met. Compared to peak-shaving mode, which relies on the previous day's electricity price forecast, frequency regulation mode offers greater real-time performance, resulting in more accurate adjustment of the thermal power unit's generated power and the energy storage device's charge and discharge power, avoiding power mismatches caused by forecast errors. Furthermore, by integrating peak-shaving and frequency regulation modes, the thermal power storage system can prioritize grid demand through frequency regulation mode while utilizing peak-shaving mode to control charging during valley hours and discharging during peak hours, optimizing economic returns. This ensures that the grid's power supply needs are met while ensuring economic benefits.

[0112] In this embodiment, the operation modes of the thermal storage system include a peak shaving mode and a frequency regulation mode, so that in the peak shaving mode, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device can be controlled according to the mains electricity price and the charge and discharge reference value. This enables the thermal storage system to reduce losses and store energy when the electricity price is low, and discharge energy when the electricity price is high to increase profits, thereby maximizing the utilization of the peak-valley electricity price difference. At the same time, the fast charge and discharge capability of the energy storage device makes up for the slow regulation of the thermal power unit, so that the thermal storage system can respond more flexibly to changes in the mains electricity price. In the frequency regulation mode, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled according to the power demand of the grid and the real-time load power of the thermal power unit, so that the combined power of the thermal storage system can quickly match the power demand of the grid, thereby maintaining the stable operation of the grid frequency. In addition, by obtaining the current operating mode of the thermal storage system, it is possible to determine the mode in which the thermal storage system is currently operating, thereby executing the corresponding control strategy to meet the needs of the power grid and the economic efficiency of the thermal storage system. At the same time, when the thermal storage system operating mode switching instruction 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. When the current power change direction is the same as the power change direction to be adjusted, the thermal storage system is controlled to operate in the frequency regulation mode. When the frequency regulation mode and the peak regulation mode are intended to adjust the power generation direction of the thermal power unit in the same direction, the thermal storage system is preferentially controlled to operate in the frequency regulation mode to ensure that the combined power of the thermal storage system can meet the real-time power supply needs of the power grid, thereby improving the accuracy of the regulation of the power generation power of the thermal power unit and the charging and discharging power of the energy storage device. In this embodiment, by coordinating the comprehensive peak regulation mode and the frequency regulation mode of the thermal storage system, the power supply needs of the power grid are met while ensuring economic benefits.

[0113] Example 3

[0114] Figure 3 This is a flow chart of a control method for a fire storage system provided by the third embodiment of the present invention. Based on the above embodiment, this embodiment describes the control method for the fire storage system when the current power change direction is different from the power change direction to be adjusted. Correspondingly, Figure 3 As shown, the control method of the fire storage system may include:

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

[0116] Among them, the operation modes of the thermal storage system can include peak regulation mode and frequency regulation mode.

[0117] S202. When the thermal storage system operation mode switching instruction is obtained, the current power change direction of the thermal power unit in the current operation mode and the to-be-adjusted power change direction of the thermal power unit in the to-be-switched operation mode are obtained.

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

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

[0120] Among them, the current power change direction is different from the power change direction to be adjusted, which can be understood as follows: if the current operating mode is the peak-shaving mode, and the operating mode to be switched is the frequency regulation mode, then in the current operating mode, the power generation power of the thermal storage system needs to be increased to adapt to the winning power of the thermal storage system, and the power demand of the power grid decreases in the operating mode to be switched, so that the power generation power of the thermal power unit needs to decrease accordingly; or, if the current operating mode is the peak-shaving mode, and the operating mode to be switched is the frequency regulation mode, then in the current operating mode, the power generation power of the thermal storage system needs to be reduced to adapt to the winning power of the thermal storage system, and the power demand of the power grid increases in the operating mode to be switched, so that the power generation power of the thermal power unit needs to increase accordingly; on the contrary, when the current operating mode is the frequency regulation mode and the mode to be switched is the peak-shaving mode, the content is similar to the above and will not be repeated here.

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

[0122] The comprehensive benefits of peak-shaving under the peak-shaving mode can be specifically understood as the total economic return obtained by the thermal storage system through the peak-shaving mode, which can be composed of three parts: First, the indirect benefits of assessment exemption. When a thermal power unit fails to provide basic peak-shaving capacity according to the grid dispatch instructions due to its own regulation capacity limitations, it will face power assessment and revenue penalties. By quickly supplementing the power deviation of the thermal power unit through energy storage equipment, the assessment penalties caused by the insufficient peak-shaving capacity of the thermal power unit can be reduced or avoided, indirectly saving costs for the system and generating revenue; Second, the benefits of the peak-valley electricity price difference. That is, the thermal storage system takes advantage of the peak and valley fluctuations of electricity prices to control the charging of energy storage equipment to store energy or reduce the power generation of thermal power units during valley price periods, and to control the discharge of energy storage equipment or increase the power generation of thermal power units during peak price periods, creating direct economic benefits through "buying low and selling high"; Third, the benefits of deep peak-shaving compensation. When the thermal storage system proactively reduces its power to below the basic peak-shaving capacity during low electricity price periods, that is, when deep peak-shaving occurs, 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 frequency regulation benefits under the frequency regulation mode can be specifically understood as the total economic returns obtained by the thermal storage system through the frequency regulation mode, which includes two parts: one is the indirect benefit of exemption from assessment, that is, by combining energy storage equipment with thermal power units to form a thermal storage system, the shortcomings of the frequency regulation performance of the thermal power units are compensated, thereby avoiding the assessment penalty for power that does not meet the grid demand; the second is the comprehensive benefit of frequency regulation mileage, that is, the total amount of power adjustment increased by rapid adjustment during the frequency regulation process of the thermal storage system, that is, the frequency regulation mileage, which can obtain ancillary service compensation benefits from the grid or electricity market.

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

[0125] Specifically, when the controller determines through comparison that the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency-regulation benefit, it controls the thermal storage system to operate in frequency-regulation mode, enabling the thermal storage system to achieve higher economic returns through frequency-regulation mode. Furthermore, the controller can rapidly adjust the combined power of the thermal storage system by prioritizing frequency-regulation mode to maintain grid frequency stability and ensure that the grid's real-time power supply needs are met. By selecting frequency-regulation mode and peak-shaving mode based on a comparison of the comprehensive peak-shaving and frequency-regulation benefits, the thermal storage system can flexibly adapt to the dual demands of the grid and the market, ensuring both economic benefits and the grid's power supply needs.

[0126] S206. When the comprehensive benefit of peak regulation is greater than the comprehensive benefit of frequency regulation, the thermal storage system is controlled to operate in peak regulation mode.

[0127] Specifically, when the controller determines through comparison that the comprehensive benefit of peak regulation is greater than the comprehensive benefit of frequency regulation, it will control the thermal storage system to operate in peak regulation mode, so that the thermal storage system can obtain higher economic returns through the peak regulation mode, and can fully utilize the peak and valley fluctuations of the city electricity price through the peak regulation mode, and obtain higher peak and valley electricity price difference benefits by charging during the valley price period and discharging during the peak price period. At the same time, the peak regulation mode operates with a longer regulation cycle, reducing the frequent start and stop or power switching of thermal power units and energy storage equipment, thereby reducing equipment loss in the thermal storage system and improving the long-term stability and life of the thermal storage system.

[0128] In this embodiment, 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-regulating benefit in the frequency-regulating mode are obtained. This allows the thermal storage system to be controlled to operate in the frequency-regulating mode when the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency-regulating benefit, and to be controlled to operate in the peak-shaving mode when the comprehensive peak-shaving benefit is greater than the comprehensive frequency-regulating benefit. This allows the thermal storage system to obtain higher economic returns through the frequency-regulating mode or the peak-shaving mode. At the same time, the frequency-regulating mode and the peak-shaving mode are selected based on the comparison of the comprehensive peak-shaving benefit and the comprehensive frequency-regulating benefit, allowing the thermal storage system to flexibly adapt to the dual needs of the power grid and the market, so as to meet the power supply needs of the power grid while ensuring economic benefits.

[0129] Example 4

[0130] Figure 4 This is a flow chart of a method for controlling a thermal storage system in a peak-shaving mode provided by a fourth embodiment of the present invention. This embodiment, based on the above embodiments, describes in detail a method for controlling the power generation power of a thermal power unit and the charge and discharge power of an energy storage device in a peak-shaving mode. Accordingly, Figure 4 As shown, the control method of the fire storage system may include:

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

[0132] Specifically, peak-shaving mode can be understood as an operational strategy in which a thermal energy storage system adjusts its generated power to accommodate price fluctuations in the power market, thereby maximizing economic returns. Therefore, real-time acquisition of the thermal energy storage system's peak-shaving parameters lays the foundation for subsequent control of the thermal power generation and the charge and discharge power of the energy storage device.

[0133] Optionally, the peak shaving parameters include the utility electricity price and the charge and discharge reference value.

[0134] The utility price can be determined based on electricity demand over a period of time or the previous day's electricity demand. For example, during periods of low electricity demand when renewable energy output is high, the utility price can be lower, while during peak electricity demand periods when renewable energy output is low, the utility price can be lower. The charge and discharge reference value can be understood as the economic critical point in a thermal energy storage system used to determine whether to charge or discharge the energy storage device. The charge and discharge reference value can include a charge reference value and a discharge reference value.

[0135] It can be understood that 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; 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. The discharge benchmark value is usually higher than the charging benchmark value, and the difference between the two reflects the break-even point of the energy storage device. For example, when the energy storage device breaks even when the difference between the peak and valley electricity prices is 0.6 yuan, the discharge benchmark value = charging benchmark value + 0.6, that is, the energy storage device will only discharge when the peak electricity price is 0.6 yuan higher than the valley electricity price.

[0136] S302: Control the power generation of the thermal power unit and the charge and discharge power of the energy storage device according to the peak regulation parameters.

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

[0138] Optionally, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled according to the peak-shaving parameters, including: constructing a peak-shaving charge and discharge function according to the city electricity price and the charge and discharge benchmark value; controlling the charge and discharge power of the energy storage device according to the peak-shaving charge and discharge function; and controlling the power generation power of the thermal power unit according to the charge and discharge power of the energy storage device and the winning bid power of the thermal storage system.

[0139] The peak-shaving charge-discharge function may be a formula for controlling the charge and discharge power of the energy storage device in the peak-shaving mode, so that the thermal storage system can have a higher economic value.

[0140] Optionally, the peak-shaving charge and 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 is the current charging power of the energy storage device, 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;

[0144] The peak-shaving discharge function is:

[0145]

[0146] Among them, 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 rated charge and discharge power of the energy storage device, k2 and C2 are both discharge coefficients, and c is the discharge benchmark electricity price.

[0147] Specifically, the peak-shaving charging function is as follows: Figure 5 As shown, the peak discharge function is as follows Figure 6 As shown. The controller first determines the relationship between the real-time electricity price x of the power grid and the charging benchmark electricity price b and the discharging benchmark electricity price c. When the real-time electricity price x of the power grid is less than the charging benchmark electricity price b, the energy storage device will charge; when the real-time electricity price x of the power grid is greater than the discharging benchmark electricity price c, the energy storage device will discharge. Among them, when the energy storage device is charging, if the real-time electricity price x of the power grid is less than the charging benchmark electricity price b and less than the electricity price a, the energy storage device will charge at the rated charge and discharge power of the energy storage device. At this time, the electricity price is very economical, and the energy storage device will store energy with all its strength for subsequent high-price discharge; if the real-time electricity price x of the power grid is between the electricity price a and the charging benchmark electricity price b, the charging power of the energy storage device will be in accordance with the linear function P 充 =k1*x+C1 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 electricity 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 the energy storage device is discharging, if the real-time electricity price x of the grid is lower than the discharge benchmark electricity price c, the discharge power of the energy storage device is 0. At this time, the real-time electricity price x of the grid is too low to cover the discharge cost and is not economical. If the real-time electricity price x of the grid is between the discharge benchmark electricity price c and the electricity price d, the discharge power of the energy storage device will be calculated according to the linear function P. 放 =k2*x+C2 for adjustment. As the real-time electricity price x of the power grid increases, the benefits gradually increase, 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, and the energy storage device will discharge at the rated charge and discharge power of the energy storage device to maximize the discharge benefits.

[0149] It is understandable that the electricity price a may be equal to the electricity price c, the electricity price d may be the sum of the electricity price a and the electricity price c, and K1 and K2 may be equal or unequal, which is not specifically limited in the present invention.

[0150] After determining the peak-shaving charge and discharge function, the controller controls the charge and discharge power of the energy storage device based on the grid's real-time electricity price and the peak-shaving charge and discharge function. This allows the energy storage device to minimize losses and store energy during low electricity prices, while discharging energy during high electricity prices to increase revenue. This maximizes the difference between peak and valley electricity prices and optimizes the economic benefits of the thermal storage system. After determining the charge and discharge power of the energy storage device based on the peak-shaving charge and discharge function, the controller controls the power generation of the thermal power units based on the charge and discharge power of the energy storage device and the winning bid power of the thermal storage system. The winning bid power refers to the expected power generation allocated to the thermal storage system by the grid or power trading center based on the previous day's bids and bidding results in the electricity market. The winning bid power reflects the total power the thermal storage system promises to provide to the grid during a specific period of time. It is composed of the power generation power of the thermal power units in the thermal storage system and the charge and discharge power of the energy storage device. For example, when the energy storage device is discharging, the winning bid power is the sum of the thermal power unit's generating power and the energy storage device's discharging power. When the energy storage device is charging, the winning bid power is the difference between the thermal power unit's generating power and the energy storage device's charging power. Therefore, by determining the energy storage device's charging and discharging power and the winning bid power of the thermal storage system, the thermal power unit's generating power can be determined. This allows the energy storage device and the thermal power unit to jointly regulate the thermal storage system's peak load. Furthermore, the energy storage device's rapid charging and discharging capabilities compensate for the thermal power unit's slow regulation, enabling the thermal storage system to more flexibly respond to changes in utility electricity prices, ensuring economic benefits while meeting the grid's power supply needs.

[0151] This embodiment acquires the peak-shaving parameters of the thermal storage system in real time during peak-shaving mode. This allows the thermal storage system to control the generated power of the thermal power units and the charge and discharge power of the energy storage device based on the peak-shaving parameters, enabling the thermal storage system to formulate a reasonable control strategy to align the generated power at each time period with the real-time electricity price. By constructing a peak-shaving charge and discharge function based on the utility price and a charge and discharge benchmark value, and controlling the charge and discharge power of the energy storage device according to the peak-shaving charge and discharge function, the energy storage device reduces losses and stores energy during low electricity prices, while discharging energy during high electricity prices to increase revenue. This maximizes the difference between peak and valley electricity prices and optimizes the economic benefits of the thermal storage system. Furthermore, by controlling the generated power of the thermal power units based on the charge and discharge power of the energy storage device and the winning bid power of the thermal storage system, the energy storage device and the thermal power units can jointly peak-shaving the thermal storage system. The energy storage device's rapid charge and discharge capabilities offset the thermal power units' slow regulation, enabling the thermal storage system to more flexibly respond to changes in utility prices, ensuring economic benefits while meeting the power supply needs of the power grid.

[0152] Example 5

[0153] Figure 7This is a flow chart of a control method for a thermal storage system in a peak-shaving mode provided by the fifth embodiment of the present invention. This embodiment describes the operating conditions of the peak-shaving mode based on the above embodiment. Figure 7 As shown, the control method of the fire storage system may include:

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

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

[0156] Optionally, the lower power limit of the power generation economic range of the thermal storage system is P min , the power upper limit 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 is the minimum power generation capacity of the thermal power unit, P Gmax is the maximum power generation capacity of the thermal power unit, P ec is the rated charging power of the energy storage device, P ed is the rated discharge power of the energy storage device, P allow1 is the lower limit of the power generation capacity of the thermal storage system, P allow2 It is the upper limit of the power generation capacity allowed by the thermal storage system.

[0160] Specifically, the lower limit of the power generation capacity of the thermal storage system during the period of low electricity price is P min , Pmin The value of P Gmin -P ec and P Gmin -P allow1 The larger value among them, P Gmin is the minimum power generation capacity of the thermal power unit, which takes into account factors such as the boiler operation stability, unit operation economy, and thermal power unit heating demand. ec is the rated charging power of the energy storage device, P Gmin -P ec It indicates the minimum net output power of the thermal storage system when the energy storage device is charged at rated power, that is, the lower limit of the power generation capacity that the energy storage device can expand the thermal storage system. allow1 is the lower limit of the power generation capacity of the thermal storage system, which takes into account factors such as medium- and long-term power transactions. Gmin -P allow1 Indicates the minimum requirement of the power grid for the net output power of the thermal storage system. min Take P Gmin -P ec and P Gmin -P allow1 The larger value in ensures that the lower limit of the power generation capacity of the thermal storage system does not exceed the technical limitations of the thermal power units and energy storage equipment, nor is it lower than the minimum requirement of the power grid for the power generation capacity of the thermal storage system.

[0161] The upper limit of the power generation capacity of the thermal storage system during the peak period of the city electricity price is P max , P max The value of P Gmax +P ed and P Gmax +P allow2 The smaller value of P Gmax is the maximum power generation capacity of the thermal power unit, which takes into account factors such as the boiler operation stability, unit operation economy, and thermal power unit heating demand. ed is the rated discharge power of the energy storage device, P Gmax +P ed It indicates the maximum output power of the thermal storage system when the energy storage device is discharged at rated power, that is, the upper limit of the power generation capacity that the energy storage device can expand the thermal storage system. allow2 is the upper limit of the power generation capacity of the thermal storage system. The lower limit takes into account factors such as medium- and long-term power transactions. Gmax +P allow2 Indicates the maximum net output power requirement of the power grid for the thermal storage system. max Take P Gmax +P ed and P Gmax +P allow2The smaller value of ensures that the upper limit of the thermal storage system's power generation capacity does not exceed the technical limitations of the thermal power units and energy storage equipment, nor is it higher than the maximum limit of the power grid on the power generation capacity of the thermal storage system.

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

[0163] Specifically, if the controller determines that the winning bid power falls within the economic range of the thermal storage system's power generation, based on the winning bid power and the thermal storage system's power generation economic range, it can be determined that the thermal storage system's overall output can meet both economic requirements and grid power demand. At this point, the controller will continue to obtain operating status information from the energy storage device to further determine whether the thermal storage system meets the conditions for entering peak load regulation mode. Among them, the operating condition information of the energy storage device includes the core components of the energy storage device, such as the working status of the battery management system (BMS), power conversion system (PCS) and energy management system (EMS); the state of charge (SOC) of the energy storage device; the status requirements for the coordinated operation of the thermal power unit and the energy storage device, such as whether the thermal power unit has 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 device are operating normally; key operating parameters of the energy storage device and the thermal power unit, such as power, voltage, current and SOC, whether the feedback signals are complete and correct, and whether there is no data loss or abnormality.

[0164] S403: When it is determined based on the operating condition information of the energy storage device that the energy storage device meets the conditions for being put into use, the thermal storage system is controlled to enter a peak-shaving mode.

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

[0166] S404. When the winning bid power is not within the economic range of power generation, or when the energy storage device is determined by the operating condition system to not meet the conditions for being put into use, the energy storage device is controlled to be in a standby state, and the thermal power unit is controlled to generate electricity at the winning bid 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 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 state, and control the thermal power unit to independently generate electricity at the winning bid power to meet the power demand of the power grid, and avoid equipment damage or safety accidents caused by operational failures of the energy storage equipment, thereby improving the safety and operational stability of the thermal storage system.

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

[0169] S405. In the peak-shaving mode, the peak-shaving parameters of the thermal storage system are obtained in real time.

[0170] S406. Control the power generation of the thermal power unit and the charge and discharge power of the energy storage device according to the peak regulation parameters.

[0171] This embodiment obtains the winning bid power of the thermal storage system and the power generation economic range of the thermal storage system, and obtains the operating condition information of the energy storage device when the winning bid power is within the power generation economic range. This allows the thermal storage system to enter peak-shaving mode when the energy storage device meets the commissioning conditions based on the operating condition information of the energy storage device. This ensures safe and reliable operation of the thermal storage system, improves economic benefits, meets the power demand of the power grid, and extends the service life of the thermal storage system. Furthermore, when the winning bid power is not within the power generation economic range, or when the energy storage device operating condition system determines that the energy storage device does not meet the commissioning conditions, the energy storage device is controlled to enter a standby state and the thermal power unit is controlled to generate power at the winning bid power, thereby meeting the power demand of the power grid and avoiding equipment damage or safety accidents caused by operational failures of the energy storage device. This improves the safety and operational stability of the thermal storage system.

[0172] Example 6

[0173] Figure 8 This is a flow chart of a method for controlling a thermal storage system in a frequency modulation mode provided by a sixth embodiment of the present invention. This embodiment, based on the above embodiments, describes in detail a method for controlling the power generation of a thermal power unit and the charge and discharge power of an energy storage device in a frequency modulation mode. Accordingly, Figure 8 As shown, the control method of the fire storage system may include:

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

[0175] Specifically, frequency regulation mode can be understood as an operating strategy in which the thermal energy storage system rapidly adjusts the real-time load power of thermal power units in response to changes in the power demand of the grid, thereby maintaining a stable grid frequency. Therefore, by acquiring the frequency regulation parameters of the thermal energy storage system in real time, it 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 grid demand power, load power of the thermal power unit, and dead zone power threshold of the thermal power unit.

[0177] Among them, the power demand of the power grid can be specifically understood as the target power that the power grid requires the thermal storage system to provide through a frequency regulation instruction at a certain moment, such as an Automatic Generation Control (AGC) instruction. The initial load power of the thermal power unit can be specifically understood as the actual power generation power of the thermal power unit just before receiving the AGC instruction. The current load power of the thermal power unit can be specifically understood as the real-time power generation power of the thermal power unit at a specific moment in the frequency regulation process. The current load power of the thermal power unit is a dynamic value that changes with the frequency regulation. The dead zone power threshold of the thermal power unit can be specifically understood as the range in which the thermal power unit does not respond when the power deviation is less than this value during the frequency regulation process. For example, the dead zone power threshold of the thermal power unit can be about 1% of the rated power of the thermal power unit.

[0178] Specifically, when the controller determines that the current operating mode of the thermal storage system is the 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, thereby providing a basis for the subsequent construction of the frequency regulation charging and discharging formula and controlling the charging and discharging power of the energy storage equipment and the power generation power of the thermal power unit.

[0179] S502. Control the power generation of the thermal power unit and the charge and discharge power of the energy storage device according to the frequency modulation parameters.

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

[0181] Optionally, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled according to the frequency regulation parameters, including: constructing a frequency regulation charge and discharge formula according to 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; and controlling the charge and discharge power of the energy storage device and the power generation power of the thermal power unit according to the frequency regulation charge and discharge formula.

[0182] Among them, the frequency regulation charging and discharging formula can be a formula for controlling the charging and discharging power of the energy storage equipment in the frequency regulation mode, so that the overall power generation power of the thermal storage system can meet the needs of the power grid and ensure the stability of the electric energy provided by the thermal storage system to the power grid.

[0183] Optionally, a frequency regulation charging and discharging formula is constructed based on the grid demand power, initial load power, current load power, and dead zone power threshold, 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, in the response stage, the frequency regulation charging and discharging formula is:

[0184]

[0185] In the ramping stage, the frequency modulation charging and discharging formula is:

[0186]

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

[0188]

[0189] Among them, P Be1 is the charging and discharging power of the energy storage device in the response stage, P Be2 is the charging and discharging power of the energy storage device during the ramp phase, P Be3 is the charging and discharging power of the energy storage device in the steady state stage, P AGC is the power demanded by the grid, P G0 is the initial load power, P G is the current load power, P D is the dead zone power threshold.

[0190] The response phase can be specifically understood as the initial stage after the frequency modulation command is issued. During this period, 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 significantly occurred. The ramp-up phase can be specifically understood as the transition phase after the response phase, when the thermal power unit begins to adjust its power and approach the grid's required power. The steady-state phase can be specifically understood as the stage in which the thermal power unit maintains stable operation after its current load power approaches or reaches the grid's required power.

[0191] It's understood that the frequency regulation performance of a thermal power unit is characterized by three parameters: regulation rate k1, regulation accuracy k2, and response time k3. The regulation rate k1 is the rate of change of the thermal power unit's power per unit time, reflecting the unit's regulation capability during the ramp-up phase. The regulation accuracy k2 is the deviation between the thermal power unit's generated power and the target power during the steady-state phase, reflecting the accuracy and stability of the unit's power. The response time k3 is the time it takes for the thermal power unit to receive a frequency regulation command and experience a significant power change, reflecting the unit's rapid response. The product of these three parameters, K = k1 * k2 * k3, represents the unit's comprehensive frequency regulation performance. A higher K value indicates a superior response speed, regulation rate, and accuracy in frequency regulation, leading to a higher likelihood of winning bids and earning higher revenue in the frequency regulation ancillary services market. Therefore, the goal of a thermal-storage system is to improve the K value of a thermal power unit through the synergy of energy storage devices.

[0192] By comparing the relationship between the grid demand power, initial load power, current load power, and the deadband 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, 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 deadband power threshold. This indicates that the thermal power unit has not yet significantly adjusted its power, indicating that the thermal power unit is in the response phase and needs to quickly adjust its power to escape the deadband. If the deviation between the current load power and the initial load power is greater than the deadband 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 phase. 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 deadband power threshold, it indicates that the load power of the thermal power unit has basically reached the grid demand power, and the deviation has entered the deadband range, indicating that the thermal power unit is in the steady-state phase. 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, it provides a basis 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 charge and discharge formula so as to control the charge and discharge power of the energy storage device in different frequency regulation stages according to the frequency regulation charge and discharge formula of different frequency regulation stages.

[0194] For example, Figure 9 A schematic diagram of a frequency modulation instruction response process of a fire storage system provided in the sixth embodiment of the present invention is shown as follows: Figure 9As shown in the figure, from time t1 to time t2, the thermal power unit is in the response stage. At this time, the frequency regulation command has just been issued, and the thermal power unit has not yet significantly adjusted the power. The current load power P G With the initial load power P G0 The difference between them is less than the dead zone power threshold P D , indicating that the thermal power unit has not yet left the dead zone, and the grid demand power P AGC Greater than the initial load power P G0 , indicating that the thermal power unit needs to increase power output. At this time, the energy storage device discharges so that the combined power of the thermal storage system can quickly approach the dead zone boundary. Therefore, in (P AGC >P G0 )∩(P G <P G0 +P D ), 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 The increase of the discharge power P of the energy storage device Be1 will be reduced to maintain the SOC balance of the fire storage system. AGC <P G0 )∩(P G >P G0 -P D ), indicating that the thermal power unit has not yet exited the dead zone, and the grid demand power P AGC Less than the initial load power P G0 At this time, the energy storage device needs to be charged to absorb the excess power of the thermal power unit. Therefore, the charging and discharging power of the energy storage device P Be1 MIN{-P D -(P G -P G0 ),0}. Among them, when P Be1 When it is a positive value, it means that the energy storage device is discharging at this power; when P Be1 When it is a negative value, it means that the energy storage device is charged at this power.

[0195] Continue to refer Figure 9 In the time period from t2 to t3, the thermal power unit is in the ramp-up stage. At this time, the thermal power unit steps out of the dead zone, that is, the current load power P G With the initial load power P G0 The difference between them is greater than or equal to the dead zone power threshold P D , but the grid demand power P AGCand the current load power P G The difference between them is still greater than the dead zone power threshold P D , indicating that the thermal power unit has not yet completed the adjustment and the current load power P still needs to be adjusted G Power demanded from the grid P AGC Therefore, in (P AGC >P G0 )∩(P G ≥P G0 +P D )∩(P G <P AGC -P D ), the charging and discharging power P of the energy storage device Be2 P AGC -P G -P D , so that the energy storage equipment can provide additional power support for the thermal power unit, shorten the ramp time of the thermal power unit, and improve the regulation rate K1 of the thermal power unit. In addition, in (P AGC <P G0 )∩(P G ≤P G0 -P D )∩(P G >P AGC +P D ), it indicates that the thermal power unit has stepped out of the dead zone, and the current load power P G Not close to the grid demand power P AGC , and the grid demand power P AGC Less than the initial load power P G0 At this time, the energy storage device needs to be charged to absorb the excess power of the thermal power unit. Therefore, the charging and discharging power of the energy storage device P Be2 P AGC -P G +P D , so that the current load power P G Can quickly drop to the grid demand power P AGC Among them, when P Be2 When it is a positive value, it means that the energy storage device is discharging at this power; when P Be2 When it is a negative value, it means that the energy storage device is charged at this power.

[0196] Continue to refer Figure 9 In the time period from t3 to t4, the thermal power unit is in the steady state stage. At this time, the current load power P G Close to the grid demand power P AGC , and the grid demand power P AGC and the current load power P G The deviation between them is less than or equal to the dead zone power threshold PD , therefore, in (P G ≥P AGC -P D )∩(P AGC >P G0 ), 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 P AGC -P G , so that the energy storage device discharges a small amount to make up for the current load power P G and the grid demand power P AGC The power difference between the two groups is reduced, thereby improving the regulation accuracy K2 of the thermal power unit. In addition, in (P G ≤P AGC +P D )∩(P AGC <P G0 ), 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 P AGC -P G , so that the energy storage device can be charged in small amounts to make up for the excess power of the thermal power unit, thereby eliminating the slight fluctuation of the thermal power unit's power generation and maintaining the stability of the combined power of the thermal storage system. Be3 When it is a positive value, it means that the energy storage device is discharging at this power; when P Be3 When it is a negative value, it means that the energy storage device is charged at this power.

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

[0198] When the energy storage device's charging power is negative and its discharging power is positive, the thermal power unit's generating power can be equal to the sum of the grid's power demand and the energy storage device's charging or discharging power. This allows the thermal power unit's generating power to be determined by the energy storage device's charging and discharging power and the grid's power demand, enabling the energy storage device and thermal power unit to jointly regulate the frequency of the thermal-storage system. The energy storage device's rapid charging and discharging capabilities compensate for the thermal power unit's slow regulation, allowing the combined power of the thermal-storage system to quickly match the grid's power demand, effectively maintaining grid frequency stability and meeting the grid's power supply needs while ensuring economic benefits.

[0199] In this embodiment, frequency regulation parameters of the thermal power storage system are acquired in real time in frequency regulation mode, so that the generated power of the thermal power unit and the charge and discharge power of the energy storage device can be controlled according to the frequency regulation parameters. This allows the generated power to be adjusted in real time according to the power demand of the power grid when the load power of the thermal power unit deviates from the power demand of the power grid. By acquiring 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-band power threshold of the thermal power unit, the current 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-band power threshold. The current frequency regulation charge and discharge formula is then determined based on the current frequency regulation stage of the thermal power unit. The charge and discharge power of the energy storage device can then be controlled according to the frequency regulation charge and discharge formula, so that the energy storage device can improve the regulation rate, regulation accuracy, and response time of the thermal power unit, significantly improving the comprehensive frequency regulation performance of the thermal power unit and enabling the combined power of the thermal power storage system to quickly match the power demand of the power grid, effectively maintaining the stability of the power grid frequency. In addition, by controlling the power generation power of the thermal power unit according to the charging and discharging power of the energy storage device and the power demand of the power grid, the energy storage device and the thermal power unit can jointly regulate the frequency of the thermal storage system. The rapid charging and discharging capability of the energy storage device makes up for the slow regulation of the thermal power unit, achieving the goal of meeting the power supply needs of the power grid while ensuring economic benefits.

[0200] Example 7

[0201] Figure 10 : is a flow chart of a control method for a fire storage system provided by embodiment 7 of the present invention. This embodiment supplements the control method for a fire storage system based on the above embodiment. Accordingly, Figure 10 As shown, the control method of the fire storage system may include:

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

[0203] Among them, the operating modes include peak regulation mode and frequency regulation mode.

[0204] S602. When receiving the instruction for switching the operation mode of the thermal energy storage system, obtain 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 operation mode to be switched.

[0205] S603. When the current power change direction is the same as the power change direction to be adjusted, control the thermal energy storage system to operate in the frequency modulation mode.

[0206] S604. When controlling the energy storage device to charge and discharge, obtain the remaining power of the energy storage device and the rated charge-discharge power of the energy storage device in real time.

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

[0208] S605. Control the current charge-discharge power of the energy storage device according to the current remaining power and the rated charge-discharge power of the energy storage device.

[0209] Specifically, Figure 11 As shown in the figure, which is a schematic diagram of the charge-discharge power limit function of an energy storage device provided in Embodiment 7 of the present invention, the controller can realize the real-time monitoring of the SOC of the energy storage device according to the current remaining power and the rated charge-discharge power of the energy storage device, and combine the preset charge-discharge power limit function of the energy storage device to dynamically adjust the current charge-discharge power 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 energy storage system.

[0210] As Figure 11 shown, when the energy storage device is charging, when the SOC of the energy storage device satisfies the condition of 0% ≤ SOC ≤ 80%, the energy storage device charges at the rated charge-discharge power P n Since the SOC of the energy storage device is relatively low, the energy storage device has enough capacity to receive 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 be a quadratic function of 25SOC 2-50SOC + 25 decreases gradually. When SOC = 100%, the charging power of the energy storage device drops to 0, thus avoiding overcharging of the energy storage device and extending its service life. When the energy storage device discharges, when the SOC of the energy storage device satisfies the condition 0% << SOC < 10%, the discharge power of the energy storage device is 0 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 10% ≤ SOC ≤ 30%, the discharge power of the energy storage device increases gradually according to the quadratic function 25SOC 2 -5SOC + 0.25 to gradually restore the discharge capacity of the energy storage device when the SOC of the energy storage device is low, so that the discharge probability of the energy storage device gradually recovers from 0 to the rated charge-discharge power P n , while avoiding the depletion of the power of the energy storage device caused by rapid discharge; 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 discharges at the rated charge-discharge power P n to make up for the slow regulation of the thermal power unit through the fast charge-discharge ability of the energy storage device, so as to meet the power supply demand of the power grid while ensuring economic benefits.

[0211] In this embodiment, by controlling the charge and discharge of the energy storage device, the remaining power of the energy storage device and the rated charge-discharge power of the energy storage device are obtained in real time, and the current charge-discharge power of the energy storage device is controlled according to the current remaining power and the rated charge-discharge power of the energy storage device, so that the current charge-discharge power of the energy storage device can be dynamically adjusted, 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 realizing the compensation for the slow regulation of the thermal power unit through the fast charge-discharge ability of the energy storage device, so as to meet the power supply demand of the power grid while ensuring economic benefits.

[0212] Embodiment 8

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

[0214] The operating mode acquisition module 701 is used to acquire the current operating mode of the thermal energy storage system; the operating modes include a peak shaving mode and a frequency modulation mode.

[0215] The power change direction acquisition module 702 is used to obtain 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 operation mode to be switched when the thermal storage system operation mode switching instruction is obtained.

[0216] Among them, the power change direction in the peak regulation mode includes the forward peak regulation power change direction and the reverse peak regulation power change direction; the power change direction in the frequency modulation mode includes the forward frequency modulation power change direction and the reverse frequency modulation power change direction.

[0217] The operation mode switching module 703 is used to control the thermal storage system to operate in the frequency modulation mode when the current power change direction is the same as the power change direction to be adjusted.

[0218] In an optional embodiment of the present invention, the operation mode switching module 703 can 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 the peak-shaving mode and the comprehensive frequency-regulation benefit in the frequency-regulation mode; when the comprehensive peak-shaving benefit is less than or equal to the comprehensive frequency-regulation benefit, control the thermal storage system to operate in the frequency-regulation mode.

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

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

[0221] Among them, the peak-shaving parameters include the mains electricity price and the charging and discharging benchmark values.

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

[0223] The peak-shaving charge and 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is the current charging power of the energy storage device, 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;

[0227] The peak-shaving discharge function is:

[0228]

[0229] Among them, 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 rated charge and discharge power of the energy storage device, k2 and C2 are both discharge coefficients, and c is the discharge benchmark electricity price.

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

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

[0232] Among them, the lower limit of the power economic range of the thermal storage system is P min , the power upper limit 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 is the minimum power generation capacity of the thermal power unit, P Gmax is the maximum power generation capacity of the thermal power unit, P ec is the rated charging power of the energy storage device, P ed is the rated discharge power of the energy storage device, P allow1is the lower limit of the power generation capacity of the thermal storage system, P allow2 It is the upper limit of the power generation capacity allowed by the thermal storage system.

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

[0237] Among them, 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.

[0238] In an optional embodiment of the present invention, the operating mode acquisition module 701 can also be used to: construct a frequency regulation charging and discharging formula 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; and control the charging and discharging power of the energy storage device and the power generation power of the thermal power unit according to the frequency regulation charging and discharging formula.

[0239] In an optional embodiment of the present invention, the operation mode acquisition module 701 may also be used to: determine the frequency regulation stage currently in which the thermal power unit is located based on the grid demand power, 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; and determine a current frequency regulation charge and discharge formula based on the frequency regulation stage currently in which the thermal power unit is located;

[0240] Among them, in the response stage, the frequency modulation charging and discharging formula is:

[0241]

[0242] In the ramping stage, the frequency modulation charging and discharging formula is:

[0243]

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

[0245]

[0246] Among them, P Be1 is the charging and discharging power of the energy storage device in the response stage, P Be2 is the charging and discharging power of the energy storage device during the ramp phase, P Be3 is the charging and discharging power of the energy storage device in the steady state stage, P AGC is the power demanded by the grid, P G0 is the initial load power, P G is the current load power, P D is the dead zone power threshold.

[0247] In an optional embodiment of the present invention, the operating mode acquisition module 701 can also be used to: when controlling the charging and discharging of the energy storage device, obtain the remaining power of the energy storage device and the rated charging and discharging power of the energy storage device in real time; and control the current charging and discharging power of the energy storage device based on 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 execution method. For technical details not fully described in this embodiment, please refer to the control method for the fire storage system provided in any embodiment of the present invention.

[0249] Since the control device of the fire storage system described above is a device that can execute the control method of the fire storage system in the embodiment of the present invention, based on the control method of the fire storage system described in the embodiment of the present invention, those skilled in the art can understand the specific implementation methods and various variations of the control device of the fire storage system in this embodiment, so how the control device of the fire storage system implements the control method of the fire storage system in the embodiment of the present invention will not be described in detail here. As long as those skilled in the art implement the device used by the control method of the fire storage system in the embodiment of the present invention, it falls within the scope of protection of this application.

[0250] Example 9

[0251] Figure 13 A schematic diagram of the structure of a controller that can be used to implement the control method of the thermal storage system of an embodiment of the present invention is shown. The controller can take a variety of forms to suit the environment and needs within the thermal storage system, such as industrial computers, embedded controllers, intelligent control terminals, distributed control systems, and dedicated control units. These devices are specially designed to monitor and adjust the operating status of the thermal storage system, and by coordinating the power generation power of the thermal power units and the charging and discharging power of the energy storage equipment, the power supply needs of the power grid are met while ensuring economic benefits. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required 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 and a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores a computer program that can be executed by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (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 connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

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

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

[0255] In some embodiments, the control method of the fire storage system can be implemented as a computer program, which is 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 on the fire storage system of the above embodiment via a ROM and / or a communication unit. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the control method of the fire storage system described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the control method of the fire storage system by any other appropriate means (for example, by means of firmware).

[0256] Optionally, a control method for a thermal storage system may include: obtaining the current operating mode of the thermal storage system; the operating mode includes a peak-shaving mode and a frequency regulation mode; when obtaining an operating mode switching instruction of the thermal storage system, obtaining 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 is the same as the power change direction to be adjusted, controlling the thermal storage system to operate in the frequency regulation mode.

[0257] Various embodiments of the systems and techniques described 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), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0258] Computer programs for implementing 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 the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

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

[0260] To provide interaction with a user, the systems and techniques described herein can be implemented on a controller having: a fire storage system display device (e.g., a fire storage system monitoring screen) for displaying information to the user; and a fire storage system input unit (e.g., an operation panel, buttons, or a touch screen of the fire storage system), through which the user can provide input to the controller. Other types of devices can also be used to provide interaction with the user; for example, the 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 techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0262] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0263] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in the present invention can be achieved. This is not limited herein.

[0264] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A control method for a fire storage system, characterized in that: The thermal storage system includes a thermal power unit and an energy storage device, and the control method of the thermal storage system includes: Obtaining a current operating mode of the thermal storage system; the operating mode includes a peak regulation mode and a frequency regulation mode; When the thermal storage system operation mode switching instruction is obtained, the current power change direction of the thermal power unit in the current operation mode and the to-be-adjusted power change direction of the thermal power unit in the to-be-switched operation mode are obtained; When the current power change direction is the same as the power change direction to be adjusted, the thermal storage system is controlled to operate in the frequency modulation mode.

2. The control method of the fire storage system according to claim 1, characterized in that: Also includes: When the current power change direction is different from the power change direction to be adjusted, obtaining a comprehensive peak regulation benefit in the peak regulation mode and a comprehensive frequency regulation benefit in the frequency regulation mode; When the comprehensive benefit of peak regulation is less than or equal to the comprehensive benefit of frequency regulation, the thermal storage system is controlled to operate in the frequency regulation mode.

3. The control method of the fire storage system according to claim 2, characterized in that: Also includes: When the comprehensive benefit of peak regulation is greater than the comprehensive benefit of frequency regulation, the thermal storage system is controlled to operate in the peak regulation mode.

4. The control method of the fire storage system according to claim 1, characterized in that: 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 power change direction in the frequency modulation mode includes a forward frequency modulation power change direction and a reverse frequency modulation power change direction.

5. The control method of the fire storage system according to claim 1, characterized in that: Also includes: In the peak-shaving mode, obtaining peak-shaving parameters of the thermal storage system in real time; According to the peak-shaving parameters, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled.

6. The control method of the fire storage system according to claim 5, characterized in that: The peak-shaving parameters include the mains electricity price and the charge and discharge reference value; According to the peak-shaving parameters, controlling the power generation power of the thermal power unit and the charge and discharge power of the energy storage device includes: Constructing a peak-shaving charge and discharge function according to the city electricity price and the charge and discharge reference value; Controlling the charge and discharge power of the energy storage device according to the peak-shaving charge and discharge function; The power generation power of the thermal power unit is controlled according to the charging and discharging power of the energy storage device and the winning bid power of the thermal storage system.

7. The control method of the fire storage system according to claim 6, characterized in that: The peak-shaving charge and discharge function includes a peak-shaving charge function and a peak-shaving discharge function: The peak-shaving charging function is: Among them, 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 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; The peak-shaving discharge function is: Among them, P 放 is the current discharge power of the energy storage device, x is the real-time electricity price of the grid, Pn is the rated charge and discharge power of the energy storage device, k2 and C2 are both discharge coefficients, and c is the discharge benchmark electricity price.

8. The control method of a fire storage system according to claim 1, characterized in that: Before the thermal storage system enters the peak load regulation mode, the method further includes: Obtaining the winning bid power of the thermal storage system and the economic range of the power generation power of the thermal storage system; When the winning bid power is within the economic range of generated power, obtaining operating condition information of the energy storage device; When it is determined according to the operating condition information of the energy storage device that the energy storage device meets the conditions for being put into use, the thermal storage system is controlled to enter the peak-shaving mode.

9. The control method of the fire storage system according to claim 8, characterized in that: Also includes: When the winning bid power is not within the economic range of power generation, or when the system determines, based on the operating condition of the energy storage device, that the energy storage device does not meet the conditions for being put into use, the energy storage device is controlled to be in a standby state, and the thermal power unit is controlled to generate electricity at the winning bid power.

10. The control method of the fire storage system according to claim 8, characterized in that: The lower limit of the power economic range of the thermal storage system is P min , the power upper limit is P max ; in: P min =MAX{P Gmin -P ec ,P Gmin -P allow1 }; P max =MIN{P Gmax +P ed ,P Gmax +P allow2 }; Among them, P Gmin is the minimum power generation capacity of the thermal power unit, P Gmax is the maximum power generation power of the thermal power unit, P ec is the rated charging power of the energy storage device, P ed is the rated discharge power of the energy storage device, P allow1 is the lower limit of the power generation capacity of the thermal storage system, P allow2 The upper limit of the power generation capacity of the thermal storage system is allowed.

11. The control method of a fire storage system according to claim 1, characterized in that: Also includes: In the frequency modulation mode, obtaining frequency modulation parameters of the fire storage system in real time; According to the frequency modulation parameters, the power generation power of the thermal power unit and the charge and discharge power of the energy storage device are controlled.

12. The control method of a fire storage system according to claim 1, characterized in that: The frequency regulation parameters include the power demand of the power grid, the load power of the thermal power unit and the dead zone power threshold of the thermal power unit; Controlling the power generation power of the thermal power unit and the charge and discharge power of the energy storage device according to the frequency modulation parameters includes: Constructing a frequency regulation charging and discharging formula according to 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; According to the frequency modulation charging and discharging formula, the charging and discharging power of the energy storage device and the generating power of the thermal power unit are controlled.

13. The control method of the fire storage system according to claim 12, characterized in that: A frequency modulation 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: Determining the frequency regulation stage currently in which the thermal power unit is located according to the grid demand power, 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; Determining a current frequency regulation charging and discharging formula according to the current frequency regulation stage of the thermal power unit; Among them, in the response stage, the frequency modulation charging and discharging formula is: In the ramp-up phase, the frequency modulation charging and discharging formula is: In the steady-state stage, the frequency modulation charging and discharging formula is: Among them, P Be1 is the charge and discharge power of the energy storage device in the response stage, P Be2 is the charge and discharge power of the energy storage device during the ramp phase, P Be3 is the charge and discharge power of the energy storage device in the steady state stage, P AGC is the power demanded by the grid, P G0 is the initial load power, P G is the current load power, P D is the dead zone power threshold.

14. The control method of a fire storage system according to claim 1, characterized in that: Also includes: When controlling the energy storage device to charge and discharge, obtaining the remaining power of the energy storage device and the rated charge and discharge power of the energy storage device in real time; The current charge and discharge power of the energy storage device is controlled according to the current remaining power of the energy storage device and the rated charge and discharge power.

15. A control device for a fire storage system, characterized in that: The thermal storage system includes a thermal power unit and an energy storage device, and the control device of the thermal storage system includes: An operation mode acquisition module is used to obtain the current operation mode of the thermal storage system; the operation mode includes a peak regulation mode and a frequency regulation mode; a power change direction acquisition module, configured to acquire, upon obtaining an instruction to switch the operation mode of the thermal storage system, a current power change direction of the thermal power unit in the current operation mode and a power change direction to be adjusted of the thermal power unit in the operation mode to be switched; An operation mode switching module is used to control the thermal storage system to operate in the frequency modulation mode when the current power change direction is the same as the power change direction to be adjusted.

16. 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 storage system according to any one of claims 1 to 14.

17. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the control method of the fire storage system according to any one of claims 1 to 12 when executed.

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