Fire storage combined frequency control method and device for coping with continuous climbing and descending

Abstract

The application belongs to the technical field of power grid frequency modulation control, and discloses a kind of fire storage combined frequency modulation control method and device for coping with continuous climbing and downhill, wherein the method comprises: calculating the SOC value of energy storage system, judging the state of energy storage system according to the SOC value: when the energy storage system is in normal energy storage regulation state, let the energy storage system bear the difference part of the total target value of fire storage combined frequency modulation instruction and the power of thermal power generating unit; when the energy storage system is in energy storage charge early warning state, let the load instruction of thermal power generating unit be equal to the total target value of fire storage combined frequency modulation instruction; when the energy storage system is in energy storage regulation limiting state, the adjustment task of AGC instruction is borne by thermal power generating unit, and the protection mechanism of energy storage system is triggered. The method of the application can greatly improve the AGC regulation performance index of thermal power generating unit, so that the unit can obtain more auxiliary service income.

Description

Technical Field

[0001] This application relates to the field of power grid frequency regulation control technology, and in particular to a method and device for combined thermal and energy storage frequency regulation control to cope with continuous climbing and descent. Background Technology

[0002] For the receiving-end power grid of inter-provincial power transmission lines, factors such as the uncertainty of renewable energy generation and the fluctuation of power output from these lines cause instability in the grid frequency. Primary frequency regulation is the first means of stabilizing the grid frequency, but it is a differential regulation method. The stability of the grid frequency depends on secondary frequency regulation (AGC). To encourage more generating units to participate in AGC regulation, an ancillary services market has been established. Thermal power units can obtain ancillary service revenue by participating in AGC regulation, and the amount of revenue is linked to the unit's regulation performance indicators. For thermal power units to improve their ancillary service revenue, they must enhance their regulation performance. Joint participation of energy storage and thermal power units in secondary frequency regulation is a good option.

[0003] The AGC (Automatic Generation Control) performance indicators include regulation rate (K1), regulation accuracy (K2), and response time (K3). Electrochemical energy storage has advantages such as short response time, fast regulation rate, and high control accuracy. Building energy storage systems in power plants and coordinating them with thermal power units for secondary frequency regulation can improve the AGC performance indicators of the units. However, due to cost issues, the energy storage systems equipped in thermal power units typically have limited capacity. For example, a 2×350MW thermal power project is equipped with a 9MW / 9MWh energy storage system. These systems usually have a State of Charge (SOC) protection mechanism; when the SOC reaches the upper (lower) limit, charging (discharging) of the energy storage system is prohibited. The limited SOC of the energy storage system has become a major factor restricting the joint frequency regulation of thermal power and energy storage.

[0004] Only when the AGC command fluctuates can the energy storage system maintain a balance between charging and discharging. However, for the receiving-end grid, fluctuations in tie-line power and renewable energy generation power are large-scale power fluctuations, often requiring thermal power units to continuously climb or descend to maintain grid frequency stability. Currently, thermal power units often need to execute continuous climbing (descending) commands multiple times a day. When the AGC command received by the thermal power unit is a continuous climbing command, according to the existing control strategy, the energy storage system needs to continuously discharge, and its SOC will quickly reach the lower limit, unable to continue discharging. The thermal power unit will then lose the assistance of energy storage when executing subsequent climbing commands, resulting in a decline in regulation performance. Conversely, when the AGC command received by the thermal power unit is a continuous descending command, according to the existing control strategy, the energy storage system needs to continuously charge, and its SOC will quickly reach the upper limit, unable to continue charging. The thermal power unit will then lose the assistance of energy storage when executing subsequent descending commands, resulting in a decline in regulation performance. Summary of the Invention

[0005] This application provides a method and apparatus for combined thermal and energy storage frequency regulation control to cope with continuous uphill and downhill slopes. It calculates the State of Charge (SOC) value of the energy storage system, classifies different energy storage system states based on the SOC, sets a total regulation target value, and adjusts the system according to the total regulation target value. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0006] According to a first aspect of the embodiments of this application, a method for joint frequency regulation control of thermal power and energy storage to cope with continuous climbing and descending slopes is provided, comprising:

[0007] Calculate the SOC value of the energy storage system and determine the state of the energy storage system based on the SOC value;

[0008] When the energy storage system is in the normal energy storage regulation state, the AGC command is limited by different rates to generate the total target value of the thermal power unit load command and the thermal power-storage joint frequency regulation command. The energy storage system is made to bear the difference between the total target value of the thermal power-storage joint frequency regulation command and the power generation of the thermal power unit, so that the sum of the power generation of the thermal power unit and the charging and discharging power of the energy storage system is equal to the total target value of the thermal power-storage joint frequency regulation command.

[0009] When the energy storage system is in the energy storage charge warning state, the AGC command is limited by the same rate to generate the total target value of the thermal power unit load command and the thermal power-storage joint frequency regulation command, so that the thermal power unit load command and the total target value of the thermal power-storage joint frequency regulation command are equal.

[0010] When the energy storage system is in an energy storage regulation limitation state, the regulation task of the AGC command is undertaken by the thermal power unit, and the energy storage system triggers the protection mechanism.

[0011] In one embodiment, the step of calculating the SOC value of the energy storage system and determining the state of the energy storage system based on the SOC value further includes:

[0012] Obtain the initial state charge Q of the energy storage system 0储 (kw / h);

[0013] The SOC value of an energy storage system is calculated using the following formula:

[0014]

[0015] In the formula, Q 额-储 For the rated capacity (kW / h) of the energy storage system, P 储-充 Charging power (kW) for the energy storage system, P 储-放is the discharge power (kW) of the energy storage system. When AGC is an increase command, P 储-充 equals 0. When AGC is a decrease command, P 储-放 equals 0.

[0016] In one embodiment, the step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes:

[0017] When the SOC value satisfies 0.3 ≤ SOC ≤ 0.7, the energy storage system is in a normal energy storage regulation state.

[0018] In one embodiment, the step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes:

[0019] When the SOC value satisfies a ≤ SOC < 0.3 or 0.7 < SOC ≤ b, the energy storage system is in a state of energy storage charge warning; where a and b are the protection values of the energy storage system.

[0020] In one embodiment, the step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes:

[0021] When the SOC value satisfies SOC < a or b < SOC, the energy storage system is in a state of energy storage regulation limit.

[0022] In one embodiment, when the energy storage system is in a normal energy storage regulation state, the step of generating the total target values of the thermal power unit load command and the thermal storage combined frequency modulation command after different rate limits for the AGC command further includes:

[0023] The rate limit value v for generating the total target value of the thermal storage combined frequency modulation command is 1.25 × 1.5% times the rated power of the thermal power unit.

[0024] In one embodiment, the calculation formula for the charge and discharge power of the energy storage system in this method is:

[0025] P 储-放 = L 总 - P 火

[0026] P 储-充 = P 火 - L 总

[0027] Where L 总 is the total target value of the thermal storage combined frequency modulation command, and P 火 is the actual power output of the thermal power unit.

[0028] In one embodiment, the step of generating the total target values ​​of the thermal power unit load command and the thermal power-storage joint frequency regulation command respectively after the AGC command is subjected to different rate limits when the energy storage system is in the normal energy storage regulation state further includes:

[0029] The rate limit value v for generating load commands for thermal power units 火 = (2 / 3)v.

[0030] In one embodiment, the method is in the following state when the energy storage system is in an energy storage charge warning state:

[0031] Before time T0, the unit operates near the output value P1. At time T0, the AGC control program issues an AGC command with a power of P2 to the thermal power unit. It is set to cross the regulation dead zone of P1 at time T1, and to enter the regulation dead zone range for the first time at time T2. At time T3, the AGC control program issues an AGC command with a power of P3 to the thermal power unit. It is set to cross the regulation dead zone at time T4, and to enter the regulation dead zone of P3 at time T5.

[0032] During the time interval T0 to T1, if P 火 <L 总 Then the discharge power P of the energy storage system 储-放 =L 总 -P 火 If P 火 >L 总 Then the charging power P of the energy storage system 储-充 =P 火 -L 总 .

[0033] In one embodiment, the method is in the following state when the energy storage system is in an energy storage charge warning state:

[0034] During the time interval T1 to T2, and 3 seconds before T2, if P 火 <L 总 Then the discharge power P of the energy storage system 储-放 =L 总 -P 火 ,; if P 火 >L 总 In this case, the energy storage system will not participate in regulation.

[0035] In one embodiment, the method is in the following state when the energy storage system is in an energy storage charge warning state:

[0036] The formula for calculating the charging and discharging power of the energy storage system during the time period from T2 to T3 is as follows:

[0037]

[0038] When the power generation of the thermal power unit is greater than P2, charge the energy storage system; when the power generation of the thermal power unit is less than P2, discharge the energy storage system.

[0039] In one embodiment, when the energy storage system is in the energy storage regulation limit state in this method:

[0040] When SOC < a, the energy storage system only charges; when b < SOC, the energy storage system only discharges.

[0041] According to the second aspect of the embodiments of the present application, a thermal energy storage combined frequency modulation control device for coping with continuous uphill and downhill is provided.

[0042] In one embodiment, the device includes a system state judgment module, an energy storage normal regulation module, an energy storage charge warning module, and an energy storage regulation limit module; wherein,

[0043] The system state judgment module calculates the SOC value of the energy storage system and judges the state of the energy storage system according to the SOC value;

[0044] The energy storage normal regulation module, when the energy storage system is in the energy storage normal regulation state, generates the total target values of the thermal power unit load command and the thermal energy storage combined frequency modulation command after different rate limitations for the AGC command, and makes the energy storage system bear the difference between the total target value of the thermal energy storage combined frequency modulation command and the power generation of the thermal power unit, so that the sum of the power generation of the thermal power unit and the charge and discharge power of the energy storage system is equal to the total target value of the thermal energy storage combined frequency modulation command;

[0045] The energy storage charge warning module, when the energy storage system is in the energy storage charge warning state, generates the total target values of the thermal power unit load command and the thermal energy storage combined frequency modulation command after the same rate limitation for the AGC command, so that the thermal power unit load command is equal to the total target value of the thermal energy storage combined frequency modulation command;

[0046] The energy storage regulation limit module, when the energy storage system is in the energy storage regulation limit state, the regulation task of the AGC command is borne by the thermal power unit, and the energy storage system triggers the protection mechanism.

[0047] In one embodiment, the system state judgment module in this device further includes:

[0048] Obtain the initial state power Q 0储 (kw / h);

[0049] Calculate the SOC value of the energy storage system. The calculation formula for the SOC value of the energy storage system is:

[0050]

[0051] In the formula, Q 额-储 is the rated capacity of the energy storage system (kw / h), P储-充 Charging power (kW) for the energy storage system, P 储-放 For the energy storage system discharge power (kW), when AGC is an increment command, P 储-充 When P equals 0, and AGC is a decrement instruction, 储-放 It equals 0.

[0052] According to a third aspect of the embodiments of this application, a computer device is provided.

[0053] In some embodiments, the computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method as described in the first aspect.

[0054] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided.

[0055] In some embodiments, a computer program is stored on a computer-readable storage medium; the computer program is executed by a processor to perform the steps of the method as described in the first aspect.

[0056] The technical solutions provided in this application embodiment may include the following beneficial effects:

[0057] This application proposes a combined thermal power and energy storage frequency regulation control method to address continuous climbing and descent scenarios. This method can significantly improve the AGC (Automatic Generative Control) performance of thermal power units, enabling them to obtain more ancillary service benefits. When the energy storage system is in normal regulation, its capacity is fully utilized to reduce the regulation burden on the thermal power unit, thereby reducing equipment wear and extending the unit's service life. In continuous climbing and descent scenarios, the method aims to optimize the unit's AGC performance and, based on the calculation characteristics of AGC performance indicators, allows the energy storage system to participate in regulation appropriately. This greatly reduces the probability of the energy storage system being unable to participate in regulation due to SOC (State of Charge) limitations, and avoids a situation where SOC limitations cause a decline in performance indicators over a certain period, leading to a decrease in the overall daily average regulation performance.

[0058] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0059] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0060] Figure 1 This is a flowchart of the combined frequency modulation control method for fire and storage to cope with continuous climbing and descending slopes provided in the embodiments of this application;

[0061] Figure 2 This is a schematic diagram of the combined frequency modulation control strategy for fire and energy storage provided in the embodiments of this application;

[0062] Figure 3 This is a schematic diagram of the adjustment process curve under normal adjustment conditions provided in the embodiments of this application;

[0063] Figure 4 This is a schematic diagram of the AGC adjustment process curve under the charge warning state provided in the embodiments of this application;

[0064] Figure 5 This is a structural diagram of the combined fire and storage frequency modulation control device for coping with continuous climbing and descending slopes provided in the embodiments of this application;

[0065] Figure 6 This is a schematic diagram of the structure of a computer device according to an exemplary embodiment. Detailed Implementation

[0066] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0067] In this document, unless otherwise stated, the term "multiple" means two or more.

[0068] This application proposes a combined thermal and energy storage frequency regulation control method to address continuous uphill and downhill conditions. By calculating the State of Charge (SOC) value of the energy storage system, different energy storage system states are defined based on the SOC, and a total regulation target value is set. Regulation according to this total regulation target value optimizes the unit's regulation performance. When the energy storage system is in normal regulation mode, its capacity is fully utilized, allowing it to undertake a portion of the regulation task. Rate limiting functionality allows the thermal power unit to undertake a portion of the regulation task. Under charge warning conditions, based on the calculation characteristics of the unit's AGC (Automatic Generation Control) performance indicators, the pure energy system participates in regulation with the goal of achieving optimal performance. Under energy storage regulation restriction conditions, the thermal power unit undertakes the total target value regulation task, and the energy storage system is only allowed to charge (discharge) in one direction.

[0069] Figure 1 A flowchart of the combined frequency regulation control method for thermal power and energy storage systems to cope with continuous uphill and downhill slopes, as described in this application, is shown below. Figure 1 As shown:

[0070] S100: Calculate the SOC value of the energy storage system and determine the state of the energy storage system based on the SOC value.

[0071] In practical implementation, the initial state energy Q of the energy storage system is first obtained. 0储 (kW / h); Further, calculate the SOC value of the energy storage system. The formula for calculating the SOC value of the energy storage system is:

[0072]

[0073] In the formula, Q 额-储 For the rated capacity (kW / h) of the energy storage system, P 储-充 Charging power (kW) for the energy storage system, P 储-放 For the energy storage system discharge power (kW), when AGC is an increment command, P 储-充 When P equals 0, and AGC is a decrement instruction, 储-放 It equals 0.

[0074] In practical implementation, based on the different SOC values ​​of the energy storage system, three states are defined:

[0075] State 1: 0.3≤SOC≤0.7. When the SOC of the energy storage system is between 0.3 and 0.7, the energy storage system is in a normal regulation state. When the AGC command fluctuates within a certain period of time, the thermal energy storage combined frequency regulation system is in a dynamic state of increasing and decreasing output, and the energy storage system is in charge-discharge balance, and its SOC can fluctuate within the normal range.

[0076] State 2: a ≤ SOC < 0.3 or 0.7 < SOC ≤ b. The energy storage system is in the state of charge warning. a and b are the protection values of the energy storage system, and different manufacturers may have different values for the protection values. When the AGC command is a continuous climbing (descending) command for a period of time, the SOC value of the energy storage system continuously decreases (increases), and the energy storage system will enter the state of charge warning.

[0077] State 3: SOC < a or b < SOC. The energy storage system is in the regulation limit state. In this state, the energy storage system triggers the protection mechanism and cannot continue to output power.

[0078] Please continue to refer to Figure 1 :

[0079] S200: When the energy storage system is in the normal energy storage regulation state, the AGC command is respectively generated into the total target values of the thermal power unit load command and the combined thermal energy and energy storage frequency modulation command after different rate limits. The energy storage system is made to bear the difference between the total target value of the combined thermal energy and energy storage frequency modulation command and the power generation power of the thermal power unit, so that the sum of the power generation power of the thermal power unit and the charge and discharge power of the energy storage system is equal to the total target value of the combined thermal energy and energy storage frequency modulation command.

[0080] Specifically, please further refer to Figure 2 , when the energy storage system is in the normal regulation state, the combined thermal energy and energy storage frequency modulation control scheme adopts the control strategy as Figure 2 shown:

[0081] When the energy storage system is in the normal regulation state, the AGC command is jointly completed by the thermal power unit and the energy storage system. The energy storage system is connected to the auxiliary power bus. The auxiliary power bus adopts a double-bus structure. The energy storage system is connected to bus a and bus b in a redundant manner to enhance the system stability. The thermal power unit maintains its original control logic unchanged and is not affected by the control of the energy storage system.

[0082] In some embodiments of the present application, the AGC command passes through a speed limit with a speed limit value of v 火 and then generates the thermal power unit load command L 火 , L 火 is subtracted from the unit power generation power and then generates the unit actuator command through the PID controller; the AGC command passes through a speed limit with a speed limit value of v and then generates the total target value L of the combined thermal energy and energy storage frequency modulation command 总 , and by using the rapidity and high precision of the energy storage system, the energy storage system is made to bear the difference between L 总 and the power generation power of the thermal power unit.

[0083] Based on this, when the energy storage system in the embodiment of this application is in normal regulation state, the energy storage system has two functions: first, by utilizing the speed and high precision of the energy storage system, the regulation performance index of the thermal power unit can be improved; second, the energy storage system shares part of the regulation task, which can greatly reduce the regulation pressure of the thermal power unit, reduce equipment wear and tear, and extend the unit's life.

[0084] Furthermore, in practical implementation, the AGC (Automatic Guided Service) performance indicators for thermal power units include regulation rate indicator K1, regulation accuracy indicator K2, and response time indicator K3. The ancillary service revenue of a thermal power unit is related to these regulation performance indicators; the higher the value of the regulation performance indicator, the greater the ancillary service revenue the unit receives.

[0085] Based on this setting, the total target value L 总 This allows for the optimization of the thermal power unit's regulation performance indicators. The sum of the thermal power unit's generating power and the energy storage system's charging (discharging) power equals L. 总 The total target value is obtained by the AGC instruction after speed limiting, and the speed limit is v.

[0086] Specifically, the formula for calculating the adjustment rate index K1 is as follows:

[0087]

[0088] In the formula, v i v is the actual adjustment rate (MW / min). n The standard regulation rate is set at 1.5% of the rated power. In practical applications, a limit is usually set for the regulation rate index K1, which is no more than 1.2. Setting the rate limit v too high will result in wasted regulation, while setting it too low will cause the AGC regulation performance index to fail to meet the requirements. Based on this, this application sets the rate limit v to 1.25 × 1.5% of the rated power of the thermal power unit.

[0089] Furthermore, such as Figure 3 As shown, after the AGC command changes, the regulation task is jointly undertaken by the thermal power unit and the energy storage system. The thermal power unit undertakes most of the regulation task, while the energy storage system, due to its smaller capacity, undertakes a smaller portion. The power generation of the thermal power unit follows the load command, and the energy storage system handles the shaded portion in the diagram. The thermal power unit uses a PID controller to control its power generation, which typically fluctuates within a small range near the load command line. Therefore, the charging and discharging power of the energy storage system is calculated using the following formula:

[0090] P 储-放 =L 总 -P 火

[0091] P 储-充 =P 火 -L总

[0092] In the formula, P 火 This is the actual power output of the thermal power unit.

[0093] The ratio of power generation from thermal power units to the charging (discharging) power of energy storage systems is limited by the rate of operation (v). 火 The value determines this. Increasing v 火 This will increase the proportion of output from thermal power units and decrease the proportion of output from energy storage systems; reducing v 火 This will reduce the proportion of output from thermal power units and increase the proportion from energy storage systems. The load command for thermal power units is derived from the AGC command after speed limiting, with a speed limit value of v. 火 v 火 = (2 / 3)v.

[0094] Please continue reading Figure 1 :

[0095] S300: When the energy storage system is in the energy storage charge warning state, the AGC command is limited at the same rate to generate the total target value of the thermal power unit load command and the thermal power-storage joint frequency regulation command, so that the thermal power unit load command and the total target value of the thermal power-storage joint frequency regulation command are equal.

[0096] In practical implementation, when the energy storage system is in an energy storage charge warning state, the combined thermal and energy storage frequency regulation control strategy used differs from step S200 in that it sets v... 火 =v,L 火 =L 总 When the energy storage system is in a charge warning state, continuing to charge (discharge) may cause the system to enter a protection limit state, thereby losing its regulation capability. Therefore, in this state, the charging (discharging) capacity of the energy storage system should be reasonably arranged so that the thermal power unit can undertake more regulation tasks. The energy storage system is only used to make up for the deficiencies of thermal power regulation, give full play to the characteristics of high speed and high precision of the energy storage system, and improve the AGC regulation performance index of the thermal power unit.

[0097] For further details, please see Figure 4 The diagram shows the AGC adjustment process curve under the charge warning state. In this embodiment, six time points are set from T0 to T5: before time T0, the unit operates near the output value P1; at time T0, the AGC control program issues an AGC command with a power of P2 to the thermal power unit; at time T1, the unit crosses the adjustment dead zone of P1; at time T2, the unit first enters the adjustment dead zone range; at time T3, the AGC control program issues an AGC command with a power of P3 to the thermal power unit; at time T4, the unit crosses the adjustment dead zone; and at time T5, the unit enters the adjustment dead zone of P3.

[0098] like Figure 4 As shown, Figure 4 This is an AGC load adjustment process. Before time T0, the unit operates stably near the output value P1. At time T0, the AGC control program issues an AGC command with a power of P2 to the unit, and the unit begins to increase its output. By time T1, it reliably crosses the adjustment dead zone of P1. At time T2, it enters the adjustment dead zone for the first time, then oscillates slightly near P2 and operates stably near P2 until time T3. At time T3, the AGC control program issues a new setpoint command to the unit, with the new AGC command being P3. The unit then begins to decrease its output. By time T4, it reliably crosses the adjustment dead zone, and by time T5, it enters the adjustment dead zone of P3 and operates stably near it.

[0099] In some embodiments of this application, for continuous ramp-up scenarios, the combined thermal power and energy storage frequency regulation control scheme is as follows:

[0100] The AGC regulation performance index of thermal power units is calculated in segments: T0-T1 is the response time index calculation segment, T1-T2 is the regulation rate index calculation segment, and T2-T3 is the regulation accuracy index calculation segment. During the charge warning state, the advantages of the energy storage system should be brought into play to maximize the regulation performance index of the unit. At the same time, the charge state of the energy storage system should be considered to extend the output time of the energy storage system as much as possible and avoid the energy storage system from entering the limiting state.

[0101] Within the T0-T1 response time index calculation period:

[0102] According to the formula for calculating the response time index K3:

[0103]

[0104] The smaller T1-T0 is, the larger the response time index. The energy storage system must ensure that the unit's response time equals T1-T0, meaning that P must be guaranteed within the time period used to calculate the response time index. 储 +P 火 Always equal to L 总 A response time greater than T1-T0 will cause K3 to decrease; a response time less than T1-T0, although it can increase K3, will also cause the adjustment rate index K2 to decrease, because the adjustment rate index K2 is the slope between T1-T2, and if T1 is shifted to the left, the slope between T1-T2 will decrease.

[0105] If P 火 <L 总 Then the discharge power P of the energy storage system 储-放 =L 总 -P 火The discharge time of the energy storage system depends on when the power generation of the thermal power unit reliably crosses the regulation dead zone. It is only considered to have reliably crossed the regulation dead zone when the total power of the energy storage system and the thermal power unit crosses the regulation dead zone and does not return to the regulation dead zone. If the discharge of the energy storage system ends at time T1, it will prolong the recognized response time of the unit and cause the response time index to decrease. Therefore, the discharge of the energy storage system should end at time T6.

[0106] If P 火 >L 总 Then the charging power P of the energy storage system 储-充 =P 火 -L 总 .

[0107] Within the calculation range of the T1-T2 adjustment rate index:

[0108] According to the formula for calculating the regulation rate index K1:

[0109]

[0110] △ represents the dead zone range (MW). The regulation rate index is only related to the slope between T1 and T2 and is not related to the intermediate process. In order to reduce unnecessary consumption of the energy storage system, the energy storage system does not participate in the regulation during the intermediate process. The energy storage system only needs to ensure that it enters the dead zone at time T2.

[0111] Time T2-3 is 3 seconds before time T2, such as P 火 <L 总 Then the discharge power P of the energy storage system 储-放 =L 总 -P 火 This ensures that the dead zone is entered at time T2; such as P 火 >L 总 Then the energy storage system does not participate in regulation because P 火 >L 总 At this time, increasing the slope between T1 and T2 can improve the value of the regulation rate index K2.

[0112] Within the calculation range of adjustment accuracy index for T2-T3:

[0113] According to the calculation formula of the adjustment accuracy index

[0114]

[0115] The smaller the deviation between the total power of the energy storage system and the thermal power unit and P2, the greater the adjustment accuracy index. This fully utilizes the speed and high precision of the energy storage system and reduces deviation. The charging (discharging) power of the energy storage system is calculated using the following formula:

[0116]

[0117] When the power generation of the thermal power unit is greater than P2, the energy storage system is charged; when the power generation of the thermal power unit is less than P2, the energy storage system is discharged. The power generation of the thermal power unit usually fluctuates around P2, and the charge-discharge balance can be maintained during the period T2 - T3.

[0118] In the embodiment of the present application, for the continuous downhill scenario, its combined thermal and energy storage frequency modulation control scheme is the same as that of the continuous uphill scenario, which will not be elaborated here.

[0119] Please continue to refer to Figure 1 :

[0120] S400: When the energy storage system is in the energy storage regulation limit state, the regulation task of the AGC command is borne by the thermal power unit, and the energy storage system triggers the protection mechanism.

[0121] In specific implementation, in this state, the AGC regulation task is borne by the thermal power unit. When SOC < a, the energy storage system can only be charged; when b < SOC, the energy storage system can only be discharged.

[0122] It should be understood that although each step in the flowchart is shown sequentially according to the arrow indication, these steps are not necessarily executed in the order indicated by the arrow. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the figure may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0123] Please refer to Figure 5 , an embodiment of the present application provides a combined thermal and energy storage frequency modulation control device for coping with continuous uphill and downhill, including a system state judgment module 10, an energy storage normal regulation module 20, an energy storage state of charge warning module 30, and an energy storage regulation limit module 40; where

[0124] The system state judgment module 10 calculates the SOC value of the energy storage system and judges the state of the energy storage system according to the SOC value;

[0125] The energy storage normal regulation module 20, when the energy storage system is in the energy storage normal regulation state, generates the total target values of the thermal power unit load command and the combined thermal and energy storage frequency modulation command respectively after different rate limitations for the AGC command, and makes the energy storage system bear the difference between the total target value of the combined thermal and energy storage frequency modulation command and the power generation of the thermal power unit, so that the sum of the power generation of the thermal power unit and the charge-discharge power of the energy storage system is equal to the total target value of the combined thermal and energy storage frequency modulation command;

[0126] The energy storage charge warning module 30, when the energy storage system is in the energy storage charge warning state, generates the total target value of the thermal power unit load command and the thermal power-storage joint frequency regulation command after limiting the AGC command at the same rate, so that the thermal power unit load command and the total target value of the thermal power-storage joint frequency regulation command are equal.

[0127] The energy storage regulation and limitation module 40, when the energy storage system is in the energy storage regulation and limitation state, the regulation task of the AGC command is undertaken by the thermal power unit, and the energy storage system triggers the protection mechanism.

[0128] In specific implementation, the system status judgment module 10 further includes:

[0129] Obtain the initial state charge Q of the energy storage system 0储 (kw / h);

[0130] The SOC value of an energy storage system is calculated using the following formula:

[0131]

[0132] In the formula, Q 额-储 For the rated capacity (kW / h) of the energy storage system, P 储-充 Charging power (kW) for the energy storage system, P 储-放 For the energy storage system discharge power (kW), when AGC is an increment command, P 储-充 When P equals 0, and AGC is a decrement instruction, 储-放 It equals 0.

[0133] Specific limitations regarding the aforementioned combined thermal power and energy storage frequency regulation control device for handling continuous uphill and downhill slopes can be found in the limitations of the combined thermal power and energy storage frequency regulation control method for handling continuous uphill and downhill slopes mentioned above, and will not be repeated here. Each module in the aforementioned combined thermal power and energy storage frequency regulation control device for handling continuous uphill and downhill slopes can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0134] In another embodiment of this application, a computer device is provided, which may be a server, and its internal structure diagram may be as follows. Figure 6As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The database stores static and dynamic information data. The network interface communicates with external terminals via a network connection. When the computer program is executed by the processor, it implements the steps in the above method embodiments.

[0135] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0136] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the method embodiments described above.

[0137] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0138] This application is not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for combined thermal power and energy storage frequency regulation control to cope with continuous uphill and downhill slopes, characterized in that, Including: Calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value; When the energy storage system is in the normal energy storage regulation state, generating the total target values of the thermal power unit load instruction and the combined thermal energy and energy storage frequency modulation instruction respectively after different rate limits for the AGC instruction, and making the energy storage system bear the difference between the total target value of the combined thermal energy and energy storage frequency modulation instruction and the power generation power of the thermal power unit, so that the sum of the power generation power of the thermal power unit and the charge and discharge power of the energy storage system is equal to the total target value of the combined thermal energy and energy storage frequency modulation instruction; When the energy storage system is in the energy storage charge warning state, generating the total target values of the thermal power unit load instruction and the combined thermal energy and energy storage frequency modulation instruction respectively after the same rate limit for the AGC instruction, so that the thermal power unit load instruction is equal to the total target value of the combined thermal energy and energy storage frequency modulation instruction; When the energy storage system is in the energy storage charge warning state: It is set that before time T0, the unit operates near the output value P1, at time T0, the AGC control program issues an AGC instruction with a power of P2 to the thermal power unit, it is set that at time T1, it steps out of the regulation dead zone of P1, it is set that at time T2, it first enters the regulation dead zone range, it is set that at time T3, the AGC control program issues an AGC instruction with a power of P3 to the thermal power unit, it is set that at time T4, it steps out of the regulation dead zone, and it is set that at time T5, it enters the regulation dead zone of P3; During the time interval T0 to T1, if P 火 < L 总 Then the discharge power P of the energy storage system 储-放 = L 总 -P 火 If P 火 >L 总 Then the charging power P of the energy storage system 储-充 =P 火 - L 总 L 总 P is the total target value of the joint frequency regulation command for fire and energy storage. 火 This represents the actual power output of the thermal power unit. During the time interval T1 to T2, and 3 seconds before T2, if P 火 < L 总 Then the discharge power P of the energy storage system 储-放 = L 总 -P 火 If P 火 >L 总 If so, the energy storage system will not participate in the regulation; In the time period from T2 to T3, the calculation formula for the charge and discharge power of the energy storage system is: When the power generation power of the thermal power unit is greater than P2, the energy storage system is charged; when the power generation power of the thermal power unit is less than P2, the energy storage system is discharged; When the energy storage system is in the energy storage regulation limit state, the regulation task of the AGC instruction is borne by the thermal power unit, and the energy storage system triggers the protection mechanism.

2. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 1, characterized in that, The step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes: Obtain the initial state energy Q of the energy storage system. 0储 kw / h; Calculating the SOC value of the energy storage system, and the calculation formula for the SOC value of the energy storage system is: In the formula, Q 额-储 For the rated capacity of the energy storage system in kW / h, P 储-充 Charging power of energy storage system (kW, P) 储-放 When the energy storage system discharge power is kW and AGC is an increment command, P 储-充 When P equals 0, and AGC is a decrement instruction, 储-放 It equals 0.

3. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 2, characterized in that, The step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes: When the SOC value satisfies 0.3 ≤ SOC ≤ 0.7, the energy storage system is in the normal energy storage regulation state.

4. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 3, characterized in that, The step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes: When the SOC value satisfies a ≤ SOC < 0.3 or 0.7 < SOC ≤ b, the energy storage system is in the energy storage charge warning state; where a and b are the protection values of the energy storage system.

5. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 4, characterized in that, The step of calculating the SOC value of the energy storage system and judging the state of the energy storage system according to the SOC value further includes: When the SOC value satisfies SOC < a or b < SOC, the energy storage system is in the energy storage regulation limit state.

6. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 5, characterized in that, When the energy storage system is in the normal energy storage regulation state, the step of generating the total target values of the thermal power unit load instruction and the combined thermal energy and energy storage frequency modulation instruction respectively after different rate limits for the AGC instruction further includes: The rate limit value v for generating the total target value of the combined thermal energy and energy storage frequency regulation command is 1.25 × 1.5% times the rated power of the thermal power unit.

7. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 6, characterized in that, The calculation formula for the charge-discharge power of the energy storage system is as follows: In the formula, L 总 P is the total target value of the joint frequency regulation command for fire and energy storage. 火 This represents the actual power output of the thermal power unit.

8. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 7, characterized in that, When the energy storage system is in the normal energy storage regulation state, the steps of respectively generating the load command of the thermal power unit and the total target value of the combined thermal energy and energy storage frequency regulation command after different rate limitations on the AGC command further include: The rate limit value v for generating the load command of the thermal power unit 火 = (2 / 3)v.

9. The combined frequency regulation control method for thermal power and energy storage to cope with continuous uphill and downhill slopes according to claim 1, characterized in that, When the energy storage system is in the energy storage regulation limit state: When SOC < a, the energy storage system only charges; when b < SOC, the energy storage system only discharges.

10. A combined thermal power and energy storage frequency modulation control device for coping with continuous uphill and downhill slopes, characterized in that, It includes a system state judgment module, a normal energy storage regulation module, an energy storage state of charge warning module, and an energy storage regulation limit module; among them, The system state judgment module calculates the SOC value of the energy storage system and judges the state of the energy storage system according to the SOC value; The normal energy storage regulation module, when the energy storage system is in the normal energy storage regulation state, respectively generates the load command of the thermal power unit and the total target value of the combined thermal energy and energy storage frequency regulation command after different rate limitations on the AGC command, and makes the energy storage system bear the difference between the total target value of the combined thermal energy and energy storage frequency regulation command and the power generation power of the thermal power unit, so that the sum of the power generation power of the thermal power unit and the charge-discharge power of the energy storage system is equal to the total target value of the combined thermal energy and energy storage frequency regulation command; The energy storage state of charge warning module, when the energy storage system is in the energy storage state of charge warning state, respectively generates the load command of the thermal power unit and the total target value of the combined thermal energy and energy storage frequency regulation command after the same rate limitation on the AGC command, so that the load command of the thermal power unit is equal to the total target value of the combined thermal energy and energy storage frequency regulation command; when the energy storage system is in the energy storage state of charge warning state: It is set that before time T0, the unit operates near the output value P1. It is set that at time T0, the AGC control program issues an AGC command with a power of P2 to the thermal power unit. It is set that at time T1, it steps out of the regulation dead zone of P1. It is set that at time T2, it first enters the regulation dead zone range. It is set that at time T3, the AGC control program issues an AGC command with a power of P3 to the thermal power unit. It is set that at time T4, it steps out of the regulation dead zone. It is set that at time T5, it enters the regulation dead zone of P3; During the time interval T0 to T1, if P 火 < L 总 Then the discharge power P of the energy storage system 储-放 = L 总 -P 火 If P 火 >L 总 Then the charging power P of the energy storage system 储-充 =P 火 - L 总 L 总 P is the total target value of the joint frequency regulation command for fire and energy storage. 火 This represents the actual power output of the thermal power unit. During the time interval T1 to T2, and 3 seconds before T2, if P 火 < L 总 Then the discharge power P of the energy storage system 储-放 = L 总 -P 火 If P 火 >L 总 If so, the energy storage system will not participate in the regulation; In the time period from T2 to T3, the calculation formula for the charge-discharge power of the energy storage system is as follows: When the power generation power of the thermal power unit is greater than P2, the energy storage system is charged; when the power generation power of the thermal power unit is less than P2, the energy storage system is discharged; The energy storage regulation limit module, when the energy storage system is in the energy storage regulation limit state, the regulation task of the AGC command is borne by the thermal power unit, and the energy storage system triggers a protection mechanism.

11. The combined thermal power and energy storage frequency modulation control device for coping with continuous uphill and downhill slopes according to claim 10, characterized in that, The system state judgment module further includes: Obtain the initial state energy Q of the energy storage system. 0储 kw / h; Calculating the SOC value of the energy storage system, and the calculation formula for the SOC value of the energy storage system is as follows: In the formula, Q 额-储 For the rated capacity of the energy storage system in kW / h, P 储-充 Charging power of energy storage system (kW, P) 储-放 When the energy storage system discharge power is kW and AGC is an increment command, P 储-充 When P equals 0, and AGC is a decrement instruction, 储-放 It equals 0.

12. The combined thermal energy and energy storage frequency regulation control device for coping with continuous uphill and downhill according to claim 11, wherein The system state judgment module further further includes: When the SOC value satisfies 0.3 ≤ SOC ≤ 0.7, the energy storage system is in a normal energy storage regulation state.

13. The combined thermal power and energy storage frequency modulation control device for coping with continuous uphill and downhill slopes according to claim 12, characterized in that, The system state judgment module further includes: When the SOC value satisfies a ≤ SOC < 0.3 or 0.7 < SOC ≤ b, the energy storage system is in a state of energy storage charge warning; where a and b are energy storage system protection values.

14. The combined thermal power and energy storage frequency modulation control device for coping with continuous uphill and downhill slopes according to claim 13, characterized in that, The system state judgment module further includes: When the SOC value satisfies SOC < a or b < SOC, the energy storage system is in a state of energy storage regulation restriction.

15. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method described in any one of claims 1-9.

16. A computer-readable storage medium, characterized in that, A computer program is stored thereon; the computer program is executed by a processor to implement the method described in any one of claims 1-9.

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