Joint frequency modulation coordination control method, system, computer equipment and storage medium for thermal power unit control and energy storage state management

Abstract

The present application relates to a method, system, computer equipment and storage medium for joint frequency modulation coordination control of thermal power unit control and energy storage state management, which includes obtaining AGC instructions P AGC And the active power of the unit at this time P ACT , calculate the power deviation #imgabs0#; if the power deviation #imgabs1# exceeds the dead zone, collect the status information of the energy storage system and the thermal power unit, calculate the parameter information of the thermal power unit, and send the variable load rate instruction and the unit target power instruction to the coordinated control system of the thermal power unit, obtain the SOC of each unit of the energy storage system, calculate the output power, energy storage output unit and output sequence of the energy storage system; when the thermal power unit reaches the load specified in the AGC instruction, control the charging and discharging of the energy storage system. This application realizes the deep coordinated control of thermal power units and energy storage devices, improves the overall response level of the combined unit and extends the service life of the energy storage system, and improves the long-term response capability to AGC instructions.

Description

Technical Field

[0001] The present application relates to the technical field of thermal power generating units, and in particular to a joint frequency regulation and coordination control method, system, computer equipment and storage medium for thermal power generating unit control and energy storage status management. Background Art

[0002] In the power system, frequency stability is one of the important indicators to ensure the quality of electric energy, and thermal power units play an important role in the frequency regulation of the power system.

[0003] Automatic generation control (AGC) can assist thermal power units in responding to frequency regulation, but thermal power units have inertial response phenomena and cannot accurately track the response status of the AGC instructions of the power grid. The frequency regulation accuracy is low, which has great limitations for short-term frequency regulation. Frequent AGC regulation directly increases the loss of thermal power unit equipment and reduces the operating life of the unit. Compared with thermal power units, the advantages of energy storage system frequency regulation are more obvious. The application of energy storage system in automatic generation control has the advantages of bidirectional regulation, fast climbing speed, accurate power response, and fast response speed. It can effectively control the power of regional power grid interconnection lines and power grid frequency, and reduce the failure and wear of conventional frequency regulation units.

[0004] However, research on energy storage participating in power system frequency regulation shows that frequent charging and discharging or overcharging and overdischarging of energy storage systems will affect the battery's state of charge (SOC), reduce the battery's service life, and increase investment costs. Energy storage only plays a role in compensating for deviations, and does not play a deep synergistic role; secondly, in the actual production and operation process, the variable load cost, battery management cost, and battery status management of thermal power units are also very important; this leads to problems such as early retirement of energy storage batteries, frequent unit accidents, and inability to respond to AGC commands for a long time in the actual operation system, so improvements are needed. Summary of the invention

[0005] In order to achieve deep coordinated control of thermal power units and energy storage devices, improve the overall response level of the combined units and extend the service life of the energy storage system, and ensure the long-term response capability of the combined thermal and energy storage system to AGC instructions, the present application provides a joint frequency modulation coordinated control method, system, computer equipment and storage medium for thermal power unit control and energy storage status management.

[0006] This application is achieved through the following technical solutions:

[0007] A combined frequency regulation and coordination control method for thermal power unit control and energy storage state management comprises the following steps:

[0008] Get AGC instructions PAGC And the active power of the unit at this time P ACT , calculate the power deviation ;

[0009] Determine the power deviation Whether the dead zone has been crossed;

[0010] If the power deviation Across the dead zone, collect the status information of the energy storage system and the thermal power unit, the status information includes the overall SOC status of the energy storage system S E , the main steam pressure of the thermal power unit p v ;

[0011] Based on the acquired state information, parameter information of the thermal power unit is calculated, and a variable load rate instruction and a unit target power instruction are sent to the coordinated control system of the thermal power unit, wherein the parameter information includes the variable load rate and the unit target power;

[0012] Obtaining the SOC of each unit of the energy storage system, and calculating the output power, energy storage output unit and output sequence of the energy storage system;

[0013] When the thermal power unit reaches the load specified in the AGC instruction, according to the SOC state of the energy storage system S E , the thermal power unit status information and the AGC instructions control the charging and discharging of the energy storage system.

[0014] Optionally, the AGC instruction is obtained P AGC And the active power of the unit at this time P ACT , calculate the power deviation Including:

[0015] The power deviation The calculation formula is: .

[0016] Optionally, if the power deviation Cross the dead zone and collect status information of energy storage system and thermal power units, including:

[0017] Determine the power deviation Is it greater than the maximum charge and discharge power P of the energy storage system? BM ,if >P BM The energy storage system is based on P BM is the target response power; if <PBM The energy storage system is is the target response power.

[0018] Optionally, the step of calculating parameter information of the thermal power unit based on the acquired state information, and sending a variable load rate instruction and a unit target power instruction to a coordinated control system of the thermal power unit, wherein the parameter information includes a variable load rate and a unit target power; comprising:

[0019] Calculate the target main steam pressure of the thermal power unit through the pre-stored turbine sliding pressure operation curve p v , according to the main steam pressure deviation, load deviation and overall SOC state deviation of the energy storage system , using fuzzy algorithm to calculate the load change rate of thermal power units v g , calculate the energy storage capacity attenuation coefficient based on the pre-stored energy storage historical charging and discharging mileage and the actual SOC status ;

[0020] Calculate the SOC state of the energy storage system at the end of the AGC instruction adjustment process S EE ;

[0021] If the calculated S EE Within the SOC constraint range of the energy storage system, the energy storage system outputs normally;

[0022] If during the AGC instruction adjustment process S EE If the energy storage SOC constraint is not met, the load change rate of the thermal power unit is modified to the preset maximum value allowed. v m , and recalculate the SOC state of the energy storage system at the end of the AGC command adjustment process S EM ;

[0023] If the S EM If the energy storage SOC constraint is not met, the AGC instruction and the load change rate of the thermal power unit are v m The energy storage system sends the power deviation to the coordinated control system of the thermal power unit. Respond to this AGC command adjustment;

[0024] When the energy storage reaches the SOC lower limit or meets the response time, the AGC response process of the energy storage system ends and waits for the S EMThe SOC constraint of the energy storage system is met.

[0025] Optionally, obtaining the SOC of each unit of the energy storage system, and calculating the output power, energy storage output unit and output sequence of the energy storage system includes:

[0026] According to the actual capacity of each energy storage unit of the energy storage system S ER ,judge S ER Whether it is greater than or equal to the target SOC of the energy storage unit, so as to classify the energy storage unit into two categories, namely, Class I energy storage unit and Class II energy storage unit;

[0027] Calculate the offset power of the energy storage unit from the target SOC value C BD , according to the energy storage unit C BD The energy storage is numbered in the order of the value, and the positive value Class I energy storage is numbered 1- N m , N m is the number of Class I energy storage, and the number of negative Class II energy storage is N m +1- N tot , N tot is the total amount of energy storage.

[0028] Optionally, the obtaining of the SOC of each unit of the energy storage system, and calculating the output power, energy storage output unit and output sequence of the energy storage system also includes:

[0029] When the total energy storage power is calculated, the charging and discharging of any one of the Class I energy storage units and the Class II energy storage units is controlled, including controlling the charging of the Class I energy storage units when the load is reduced, and controlling the discharging of the Class II energy storage units when the load is increased;

[0030] Among them, the charging and discharging power of the energy storage unit is based on the C BD When any one of the energy storage units of type I and type II is determined to be unable to bear the total energy storage power instruction, the other type of energy storage unit is controlled to start charging and discharging.

[0031] Optionally, when the thermal power unit reaches the load specified in the AGC instruction, according to the SOC state of the energy storage system S E , the state information of the thermal power unit and the AGC instruction control the charging and discharging of the energy storage system, including:

[0032] After the load of the thermal power unit reaches the AGC instruction, if no new AGC instruction is received, the total energy storage state of the energy storage system is read. S E ,When the energy storage SOC is within the preset healthy range, the energy storage system does not operate;

[0033] When the SOC of the energy storage system is lower than the lower limit of the healthy range and the actual power of the thermal power unit is greater than the AGC instruction, the energy storage is charged;

[0034] When the SOC of the energy storage system is higher than the upper limit of the healthy range and the actual power of the thermal power unit is less than the AGC instruction, the energy storage is discharged.

[0035] This application is achieved through the following technical solutions:

[0036] A joint frequency regulation and coordination control system for thermal power unit control and energy storage state management is used to execute a joint frequency regulation and coordination control method for thermal power unit control and energy storage state management.

[0037] This application is achieved through the following technical solutions:

[0038] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned joint frequency regulation and coordination control method for thermal power unit control and energy storage state management when executing the computer program.

[0039] This application is achieved through the following technical solutions:

[0040] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned joint frequency regulation and coordination control method for thermal power unit control and energy storage state management.

[0041] In summary, the present application includes at least one of the following beneficial technical effects:

[0042] 1. The present invention includes obtaining the AGC instruction and the active power of the unit at this time, and calculating the power deviation , judgment bias Whether the dead zone has been crossed; collect the status information such as the active power of the thermal power unit, the SOC status of the energy storage system, the main steam pressure of the thermal power unit, etc., calculate the load change rate of the thermal power unit, the target power of the thermal power unit, the output power of the energy storage system, the output unit and output sequence of the energy storage system; after the thermal power unit reaches the AGC command load, according to the SOC status of the energy storage system, the SOC of the energy storage system is kept in a healthy state for a long time. The present invention realizes deep coordinated control of thermal power units and energy storage devices based on the AGC commands of the power grid, the status of thermal power units, and the status of energy storage systems, improves the overall response level of the combined units and extends the service life of the energy storage system, and enhances the long-term response capability of the thermal storage combined system to AGC commands;

[0043] 2.Computer group load change rate v g ; Combined with the SOC status of the energy storage system, the actual available status of the energy storage is calculated based on the historical charging and discharging mileage of the energy storage system S ER , predict the energy storage system at the end of this AGC instruction adjustment process S EE On this basis, the load change rate of the thermal power unit is optimized to determine the action timing and power command of the energy storage system. The deep coordinated control of the thermal power unit and the energy storage system is realized to improve the response quality of the thermal-storage joint system to the AGC command.

[0044] 3. Calculate the actual available capacity of energy storage based on the historical charge and discharge mileage of each energy storage unit, and classify and number them according to the target SOC of the energy storage system, avoiding inaccurate allocation results due to a large difference between the actual capacity and the rated capacity of the energy storage system; when responding to the coordinated control of the power of the energy storage system, intelligently select the output energy storage unit and the corresponding charge and discharge power to achieve reasonable allocation of energy storage power and SOC balance of energy storage units; after the unit load reaches the AGC instruction, intelligently calculate the supplementary power and duration of the thermal power unit to maintain the SOC of the energy storage system near the set healthy range value, ensuring the long-term response capability of the thermal power and energy storage combined system to the AGC instruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a control flow chart of an embodiment of a joint frequency regulation coordination control method for thermal power unit control and energy storage state management of the present application;

[0046] Figure 2 Schematic diagram of the sliding pressure control curve of the thermal power unit in the embodiment of the present application;

[0047] Figure 3 1 is a schematic diagram of the combined action simulation curve of the AGC load-increasing energy storage system in the embodiment of the present application, wherein (a) is the unit power curve, (b) is the turbine power curve, and (c) is the energy storage power curve;

[0048] Figure 4 1 is a schematic diagram of the combined action simulation curve of the AGC load reduction energy storage system in the embodiment of the present application, wherein (a) is the unit power curve, (b) is the turbine power curve, and (c) is the energy storage power curve;

[0049] Figure 5 It is a schematic diagram of the simulation curve of the AGC continuously variable load instruction and the total power of the thermal power unit in the embodiment of the present application;

[0050] Figure 6 1 is a schematic diagram of the combined action simulation curve of the AGC continuously variable load energy storage system in the embodiment of the present application, wherein (a) is the unit power curve, (b) is the turbine power curve, and (c) is the energy storage power curve;

[0051] Figure 7 This is a principle block diagram of a computer device of the present application. DETAILED DESCRIPTION

[0052] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0053] In one embodiment, if Figure 1 As shown, the present application discloses a joint frequency regulation coordinated control method for thermal power unit control and energy storage state management, which specifically includes the following steps:

[0054] S1: Get AGC instructions P AGC And the active power of the unit at this time P ACT , calculate the power deviation In this embodiment, the power deviation The calculation formula is: .

[0055] S2: Determine power deviation Whether to cross the dead zone P D ;

[0056] In this embodiment, if the power deviation If the dead zone is not crossed, no action is taken and the process goes to step S1. Beyond the dead zone P D , then execute step S3;

[0057] Specifically, the dead zone is set to 1MW;

[0058] S3: If the power deviation Beyond the dead zone P D, collect the status information of the energy storage system and the thermal power unit, the status information includes the overall SOC status of the energy storage system S E , the main steam pressure of the thermal power unit p v ;

[0059] S4: Calculate parameter information of the thermal power unit based on the acquired state information, and send a variable load rate instruction and a unit target power instruction to a coordinated control system of the thermal power unit, wherein the parameter information includes a variable load rate and a unit target power;

[0060] In this embodiment, the judgment deviation Is it greater than the preset maximum charge and discharge power of the energy storage system? P BM In this example, the energy storage system P BM =20MW, if >P BM , set the load change rate of the thermal power unit to the maximum, and the energy storage target response power P A = P BM ;if <P BM , energy storage target response power P A = .

[0061] Furthermore, the overall SOC state of the energy storage system is collected at this time S E , Unit main steam pressure p v The computer calculates the load change rate and target power of the unit and determines whether the energy storage system is working. If the energy storage system is not working, it only sends the AGC command and the maximum load change rate of the unit to the coordinated control system of the thermal power unit. v m , end the response process; if the energy storage system outputs, the output time of the energy storage system is calculated, the variable load rate instruction and the unit target power instruction are sent to the coordinated control system of the thermal power unit, and step S5 is executed.

[0062] Specifically, refer to Figure 2 , calculate the target main steam pressure of the thermal power unit through the pre-stored turbine sliding pressure operation curve p v , according to the main steam pressure deviation, load deviation and overall SOC state deviation of the energy storage system , using fuzzy algorithm to calculate the load change rate of thermal power unitsv g , calculate the energy storage capacity attenuation coefficient based on the pre-stored energy storage historical charging and discharging mileage and the actual SOC status .

[0063] According to the fuzzy algorithm, the load change rate of the computer group v g , in this example, the fuzzy control input is:

[0064] 1) Main steam pressure deviation: upper limit is 6MPa, lower limit is -6MPa; fuzzy subsets: NB, NS, PS, PB, membership function: sinusoidal membership function.

[0065] 2) Energy storage SOC state deviation: upper limit is 30%, lower limit is -30%; fuzzy subsets: NB, NS, PS, PB; membership function: sinusoidal membership function.

[0066] 3) Load deviation: upper limit is 6MW, lower limit is -6MW; fuzzy subsets: NB, NS, PS, PB, membership function: sinusoidal membership function.

[0067] Fuzzy control output is variable load rate v g , the upper limit is 12MW / min, the lower limit is 6MW / min; fuzzy subsets: NB, NS, PS, PB; membership function: sinusoidal membership function.

[0068] The fuzzy rules are shown in Table 1:

[0069]

[0070] Calculate the energy storage capacity attenuation coefficient based on the energy storage historical charging and discharging mileage and the actual SOC status , the calculation formula is as follows:

[0071] ;

[0072] ;

[0073] in It is the historical charging and discharging mileage of energy storage; is the total energy storage mileage.

[0074] Calculate the SOC state of the energy storage system at the end of this AGC command adjustment process S EE ; The calculation formula is as follows:

[0075] ;

[0076] in C B is the rated capacity of the energy storage system.

[0077] If the calculated Within the SOC constraint range of the energy storage system, the energy storage system can output normally. In this example, the energy storage constraint range is set to 20%-80%, that is, 20%< S EE <80%, the energy storage output is normal.

[0078] If the AGC instruction adjustment process is described S EE If the energy storage SOC constraint is not met, the load change rate of the thermal power unit is modified to the preset maximum value allowed. v m , and recalculate the SOC state of the energy storage system at the end of this AGC command adjustment process S EM ; The calculation formula is as follows:

[0079] ;

[0080] like S EM If the energy storage SOC constraint is not met, the AGC command and the load change rate of the thermal power unit will be v m Sent to the coordinated control system of the thermal power unit, the energy storage system uses the power deviation Respond to this AGC command adjustment;

[0081] When the energy storage reaches the SOC lower limit or meets the response time, the AGC response process of the energy storage system ends and waits for the S EM Meet the SOC constraints of the energy storage system.

[0082] S5: Obtain the SOC of each unit of the energy storage system, and calculate the output power, energy storage output unit and output sequence of the energy storage system;

[0083] In this embodiment, according to the actual capacity of each energy storage unit of the energy storage system S ER ,judge S ER Is it greater than or equal to the target SOC of the energy storage unit? The target SOC is recorded as S O , S O It is set to 50% to divide the energy storage units into two categories, namely, Class I energy storage units and Class II energy storage units;

[0084] Calculate the offset power of the energy storage unit from the target SOC valueC BD , the calculation formula is as follows:

[0085] ;

[0086] According to the energy storage unit C BD The energy storage is numbered in descending order of value, and the positive value Class I energy storage is numbered 1- N m , N m is the number of Class I energy storage, and the number of negative Class II energy storage is N m +1- N tot , N tot is the total amount of energy storage.

[0087] When the total energy storage power is calculated, the charging and discharging of any one of the Class I energy storage units and the Class II energy storage units is controlled, including controlling the charging of the Class I energy storage units when the load is reduced, and controlling the discharging of the Class II energy storage units when the load is increased;

[0088] Among them, the charging and discharging power of the energy storage unit is based on the C BD When any one of the energy storage units of type I and type II is determined to be unable to bear the total energy storage power instruction, the other type of energy storage unit is controlled to start charging and discharging.

[0089] First, the temporary charging power of each Class I energy storage unit is calculated as:

[0090] ;

[0091] in is the temporary charging power of the i-th I energy storage unit; N m The number of Class I energy storage units participating in the allocation; P all is the total power instruction of the energy storage systems participating in the allocation.

[0092] If the calculated temporary charging power of the energy storage unit i in the Class I energy storage unit is greater than its maximum charging power, the energy storage unit is set to charge at the maximum power P Ci.max Charge and remove it from N m energy storage units are removed, and the remaining N m -1 energy storage unit participates in the allocation of the remaining total power. The formula for updating the number of class I energy storage units that can be allocated and the remaining power instruction is:

[0093] ;

[0094] renew and After that, the temporary charging power of the remaining energy storage is recalculated and the judgment is repeated with the maximum charging power of the energy storage unit until The temporary power of each Class I energy storage unit does not exceed its maximum power. The charging power of the energy storage units in the set is equal to their temporary power, and the remaining Class I storage units can operate at their maximum charging power.

[0095] When all Class I energy storage units are running at maximum power and still cannot meet the total energy storage power instruction, Class II energy storage units are called to participate in charging. Then the total energy storage power allocated by Class II energy storage units is , and distribute it according to the proportion of the offset power from the maximum SOC value of the energy storage system. Update the historical charging and discharging mileage and SOC of each energy storage at regular intervals, and adjust the energy storage category and number.

[0096] S6: When the thermal power unit reaches the load specified in the AGC instruction, the SOC state of the energy storage system S E , thermal power unit status information and AGC instructions control the charging and discharging of the energy storage system.

[0097] In this embodiment, the healthy range of the energy storage system is set at 40%< S E < 60%;

[0098] After the load of the thermal power unit reaches the AGC instruction, if no new AGC instruction is received, the total energy storage state of the energy storage system is read. S E ,When the energy storage SOC is within the preset healthy range, the energy storage system does not operate;

[0099] When the SOC of the energy storage system is lower than the lower limit of the healthy range and the actual power of the thermal power unit is greater than the AGC instruction, the energy storage is charged;

[0100] When the SOC of the energy storage system is higher than the upper limit of the healthy range and the actual power of the thermal power unit is less than the AGC instruction, the energy storage is discharged.

[0101] In one embodiment, a simulation is performed using a pre-selected million-unit unit as an example to compare conventional AGC command adjustment and the joint frequency modulation coordination control of the technical solution of the present application.

[0102] The initial power of a certain million-unit unit is 700MW. It receives the AGC instruction to increase the load to 800MW. The load change rate under the coordinated control mode of the thermal power unit is 18MW / min. The maximum power of the energy storage system is 30MW, the maximum capacity of the energy storage battery is 60MW·h, and it is assumed that the power of the energy storage system is in the range of 40%-60% when receiving the AGC instruction. The AGC instruction load increase simulation curve is as follows: Figure 3 shown.

[0103] Depend on Figure 3 From the simulation curve, it can be seen that the thermal power unit receives the AGC increase of 100MW instruction at the 70th second, the coordinated control system and the energy storage control system start to act simultaneously, the energy storage system reaches the full load of 30MW discharge after 1.2 seconds, and the load (total) of the thermal power unit increases rapidly to 730MW; the coordinated control system begins to increase the load at a rate of 18MW / min until the 310th second, when the thermal power unit reaches the AGC target load of 800MW. At this time, the coordinated control system will continue to increase the load to eliminate the energy storage discharge power, while the energy storage system adopts an adaptive strategy to maintain the same rate as the load increase rate of the thermal power unit coordinated control system to reduce the discharge power until the 408th second, when the discharge power of the energy storage system is close to 0. This process maintains the total power of the unit unchanged.

[0104] The initial power of the 100-million-unit unit is 700MW. It receives the AGC instruction to reduce the load to 600MW. The load change rate under the coordinated control mode of the thermal power unit is 18MW / min. The maximum power of the energy storage system is 30MW, the maximum capacity of the energy storage battery is 60MW·h, and it is assumed that the power of the energy storage system is in the range of 40%-60% when receiving the AGC instruction. The AGC load reduction simulation curve is as follows: Figure 4 shown.

[0105] Depend on Figure 4 From the simulation curve, it can be seen that the thermal power unit receives the AGC instruction to reduce 100MW at the 54th second, and the coordinated control system and the energy storage control system begin to act simultaneously. The energy storage system reaches full load 30MW charging after 1.1 seconds, and the load (total) of the thermal power unit is rapidly reduced to 670MW; the coordinated control system begins to reduce the load at a rate of 18MW / min until the 293th second, when the thermal power unit reaches the AGC target load of 600MW. At this time, the coordinated control system will continue to reduce the load to eliminate the energy storage charging power, and the energy storage adopts an adaptive strategy to reduce the charging power at the same rate as the load increase rate of the coordinated control system of the thermal power unit until the 389th second, when the discharge power of the energy storage system is close to 0. This process maintains the total power of the unit unchanged.

[0106] The initial power of the million-unit unit is 700MW. It receives the AGC continuous variable load instruction. The load change rate under the coordinated control mode of the thermal power unit is 18MW / min. The maximum power of the energy storage system is 30MW, the maximum capacity of the energy storage battery is 60MW·h, and it is assumed that the power of the energy storage system is in the range of 40%-60% when receiving the AGC instruction. The AGC continuous variable load simulation curve is as follows: Figure 5 shown.

[0107] Depend on Figure 6 From the AGC continuous load-variable energy storage joint action simulation curve, it can be seen that the thermal power unit receives the AGC instruction to reduce to 680MW at the 69th second, and the coordinated control system and the energy storage control system begin to act simultaneously. The energy storage system quickly reaches -20MW after 0.8s, and the coordinated control system reduces the load at 18MW / min. The energy storage system also cooperates with the coordinated control system to increase the load; at 129s, the AGC changes the load to 660MW, and the energy storage system quickly reduces the load by 20MW and then cooperates with the coordinated control system to increase the load at a uniform speed. At 209s, the AGC instruction is received to 710MW. At this time, the energy storage system quickly reaches the maximum discharge power of 30MW after 1.0s. Next, the coordinated control system begins to slowly increase the load to 710MW at a rate of 18MW / min; at 289s, the AGC instruction is received to 750MW. At this time, the energy storage system has reached the maximum discharge power of 30MW, so this section of load variation is basically completed by the coordinated control system. Finally, at the 389th second, the AGC instruction dropped to 740MW. The energy storage system was activated to quickly reduce the load of the thermal power unit to 740MW. After that, the energy storage discharge power was absorbed by the coordinated control system. Finally, at the 490th second, the energy storage power dropped to 0MW.

[0108] According to the simulation analysis of continuously variable load, after adding energy storage, if the AGC regulation of the unit can respond quickly within the energy storage regulation range, it can also shorten the regulation time compared with the coordinated control regulation outside the energy storage regulation range. At the same time, for the AGC instructions of continuously variable load, the joint regulation of thermal storage can reduce the frequent actions of coordinated control regulation, that is, the frequent actions of the thermal power unit itself, and make the regulation of the unit smoother through the role of energy storage, which is beneficial to the rapidity and accuracy of the AGC regulation of the power grid, and is also beneficial to the safety and stability of the long-term operation of the thermal power unit.

[0109] The present invention calculates the target main steam pressure of the thermal power unit through the pre-stored turbine sliding pressure operation curve p v , according to the main steam pressure deviation, load deviation and overall SOC state deviation of the energy storage system , using fuzzy algorithm to calculate the load change rate of thermal power units v g , deeply coordinate energy storage and thermal power units to improve the quality of AGC command response while reducing the load changes of the units.

[0110] The present invention calculates the real available capacity of energy storage according to the historical charge and discharge mileage of each energy storage unit, and classifies and numbers them according to the target SOC of the energy storage system, thereby avoiding the situation where the allocation result is inaccurate due to the large difference between the actual capacity and the rated capacity of the energy storage system; when responding to the coordinated control of the power of the energy storage system, the output energy storage unit and the corresponding charge and discharge power are intelligently selected to achieve reasonable allocation of energy storage power and SOC balance of energy storage units; after the unit load reaches the AGC instruction, the supplementary power and duration of the thermal power unit are intelligently calculated to maintain the SOC of the energy storage system near the set healthy range value, thereby ensuring the long-term response capability of the thermal power and energy storage combined system to the AGC instruction.

[0111] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0112] In one embodiment, a joint frequency regulation and coordination control system for thermal power unit control and energy storage status management is provided, and the joint frequency regulation and coordination control system for thermal power unit control and energy storage status management is used to execute a joint frequency regulation and coordination control method for thermal power unit control and energy storage status management.

[0113] For the specific definition of a joint frequency regulation and coordination control system for thermal power unit control and energy storage status management, please refer to the definition of a joint frequency regulation and coordination control method for thermal power unit control and energy storage status management in the above text, which will not be repeated here. Each module in the above-mentioned joint frequency regulation and coordination control system for thermal power unit control and energy storage status management can be implemented in whole or in part through software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0114] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 7As shown. The computer device includes a processor, a memory, a network interface and a database connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a joint frequency regulation and coordination control method for thermal power unit control and energy storage state management is implemented.

[0115] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, a joint frequency regulation and coordination control method for thermal power unit control and energy storage status management is implemented.

[0116] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, a joint frequency regulation and coordination control method for thermal power unit control and energy storage state management is implemented.

[0117] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0118] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0119] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A joint frequency modulation coordination control method for thermal power unit control and energy storage state management, characterized in that: include: Get AGC instructions P AGC And the active power of the unit at this time P ACT , calculate the power deviation ; Determine the power deviation Whether the dead zone has been crossed; If the power deviation Across the dead zone, collect the status information of the energy storage system and the thermal power unit, the status information includes the overall SOC status of the energy storage system S E , the main steam pressure of the thermal power unit p v ; Based on the acquired state information, parameter information of the thermal power unit is calculated, and a variable load rate instruction and a unit target power instruction are sent to the coordinated control system of the thermal power unit, wherein the parameter information includes the variable load rate and the unit target power; Obtaining the SOC of each unit of the energy storage system, and calculating the output power, energy storage output unit and output sequence of the energy storage system; When the thermal power unit reaches the load specified in the AGC instruction, according to the SOC state of the energy storage system S E , the state information of the thermal power unit and the AGC instruction control the charging and discharging of the energy storage system; The method comprises: calculating the parameter information of the thermal power unit based on the acquired state information, and sending a variable load rate instruction and a unit target power instruction to the coordinated control system of the thermal power unit, wherein the parameter information includes the variable load rate and the unit target power; comprising: Calculate the target main steam pressure of the thermal power unit through the pre-stored turbine sliding pressure operation curve p v , according to the main steam pressure deviation, load deviation and overall SOC state deviation of the energy storage system , using fuzzy algorithm to calculate the load change rate of thermal power units v g , calculate the energy storage capacity attenuation coefficient based on the pre-stored energy storage historical charging and discharging mileage and the actual SOC status ; Calculate the SOC state of the energy storage system at the end of the AGC instruction adjustment process S EE ; If the calculated S EE Within the SOC constraint range of the energy storage system, the energy storage system outputs normally; If during the AGC instruction adjustment process S EE If the energy storage SOC constraint is not met, the load change rate of the thermal power unit is modified to the preset maximum value allowed. v m , and recalculate the SOC state of the energy storage system at the end of the AGC command adjustment process S EM ; If the S EM If the energy storage SOC constraint is not met, the AGC instruction and the load change rate of the thermal power unit are v m The energy storage system sends the power deviation to the coordinated control system of the thermal power unit. Respond to this AGC command adjustment; When the energy storage reaches the SOC lower limit or meets the response time, the AGC response process of the energy storage system ends and waits for the S EM The SOC constraint of the energy storage system is met.

2. A combined frequency modulation coordination control method for thermal power unit control and energy storage state management according to claim 1, characterized in that: The AGC instruction is obtained P AGC And the active power of the unit at this time P ACT , calculate the power deviation Including: The power deviation The calculation formula is: .

3. A combined frequency modulation coordination control method for thermal power unit control and energy storage state management according to claim 1, characterized in that: If the power deviation Cross the dead zone and collect status information of energy storage system and thermal power units, including: Determine the power deviation Is it greater than the maximum charge and discharge power P of the energy storage system? BM ,if >P BM The energy storage system is based on P BM is the target response power; if < P BM The energy storage system is is the target response power.

4. A combined frequency modulation coordination control method for thermal power unit control and energy storage state management according to claim 1, characterized in that: The step of obtaining the SOC of each unit of the energy storage system and calculating the output power, energy storage output unit and output sequence of the energy storage system comprises: According to the actual capacity of each energy storage unit of the energy storage system S ER ,judge S ER Whether it is greater than or equal to the target SOC of the energy storage unit, so as to classify the energy storage unit into two categories, namely, Class I energy storage unit and Class II energy storage unit; Calculate the offset power of the energy storage unit from the target SOC value C BD , according to the energy storage unit C BD The energy storage is numbered in the order of the value, and the positive value Class I energy storage is numbered 1- N m , N m is the number of Class I energy storage, and the number of negative Class II energy storage is N m +1- N tot , N tot is the total amount of energy storage.

5. A combined frequency modulation coordination control method for thermal power unit control and energy storage state management according to claim 4, characterized in that: The step of obtaining the SOC of each unit of the energy storage system and calculating the output power, energy storage output unit and output sequence of the energy storage system also includes: When the total energy storage power is calculated, the charging and discharging of any one of the Class I energy storage units and the Class II energy storage units is controlled, including controlling the charging of the Class I energy storage units when the load is reduced, and controlling the discharging of the Class II energy storage units when the load is increased; Among them, the charging and discharging power of the energy storage unit is based on the C BD When any one of the energy storage units of type I and type II is determined to be unable to bear the total energy storage power instruction, the other type of energy storage unit is controlled to start charging and discharging.

6. A combined frequency modulation coordination control method for thermal power unit control and energy storage state management according to claim 1, characterized in that: When the thermal power unit reaches the load specified in the AGC instruction, according to the SOC state of the energy storage system S E , the state information of the thermal power unit and the AGC instruction control the charging and discharging of the energy storage system, including: After the load of the thermal power unit reaches the AGC instruction, if no new AGC instruction is received, the total energy storage state of the energy storage system is read. S E ,When the energy storage SOC is within the preset healthy range, the energy storage system does not operate; When the SOC of the energy storage system is lower than the lower limit of the healthy range and the actual power of the thermal power unit is greater than the AGC instruction, the energy storage is charged; When the SOC of the energy storage system is higher than the upper limit of the healthy range and the actual power of the thermal power unit is less than the AGC instruction, the energy storage is discharged.

7. A joint frequency regulation and coordination control system for thermal power unit control and energy storage state management, characterized in that: Used to execute a joint frequency regulation and coordination control method for thermal power unit control and energy storage status management as described in any one of claims 1 to 6.

8. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of a joint frequency regulation and coordination control method for thermal power unit control and energy storage status management as described in any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the steps of a joint frequency regulation and coordination control method for thermal power unit control and energy storage status management as described in any one of claims 1 to 6 are implemented.

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