Control method and device for hybrid energy storage system participating in AGC joint regulation of thermal power plant

Abstract

The present invention proposes a control method and device for a hybrid energy storage system to participate in the AGC joint regulation of a thermal power plant. The method includes: obtaining the AGC regulation instruction and regulation duration, as well as the real-time operating power of the thermal power plant; determining the total regulation power target value that the thermal power plant needs to adjust in total; obtaining the operating status information of the energy storage subsystem, and determining the maximum power change of the energy storage subsystem; determining the subjects participating in the regulation and the corresponding operating target power according to the total regulation power target value and the maximum power change; determining the sustainable working time of the subjects participating in the regulation; when there is a subject participating in the regulation whose sustainable working time is less than the regulation duration issued by the dispatcher, after the time arrives, the participating subject and the operating target power are adjusted for the second time. The control method of the present invention is more operational, can improve the flexible economy of the operation of the thermal power plant, and improve the key indicators of the regulation accuracy, response rate and response time of the thermal power plant participating in the AGC.

Description

Technical Field

[0001] The present invention improves a method for regulating AGC instructions in response to dispatching of a thermal power plant, and specifically relates to a control method and device for a hybrid energy storage system participating in AGC joint regulation of a thermal power plant. Background Art

[0002] With the large-scale access of new energy, the randomness and volatility of new energy indirectly increase the regulation pressure of traditional hydropower and thermal power units. Traditional hydropower and thermal power units need to quickly smooth the impact of random fluctuations in the output of new energy. Among traditional power sources, thermal power units are high-quality and scarce frequency regulation resources. However, with the continuous increase in supercritical and ultra-supercritical units of thermal power, the frequency regulation amplitude of a single thermal power unit is decreasing. At the same time, with the continuous increase in the proportion of new energy, the pressure of wind power and photovoltaic power consumption will continue to increase. The large-scale grid connection of new energy will significantly increase the AGC (Automatic Generation Control) frequency regulation demand of the power grid. In addition, a large number of thermal power units have been carrying heavy AGC regulation tasks for a long time, resulting in a series of negative effects such as difficulty in regulation and serious equipment wear. It is extremely unfavorable for the safe and economic operation of power plant equipment. According to the AGC regulation instructions and continuous operation time of some thermal power units, in most periods, the power regulation amplitude issued by AGC to a single unit of a thermal power plant is small and the duration is not long, but there are strict assessment requirements for the regulation rate, regulation accuracy and response time of thermal power units participating in AGC regulation.

[0003] In order to cope with the background of the gradual increase in the proportion of new energy, traditional thermal power units need to pay a high price to respond to the frequent adjustment of AGC and the strict assessment requirements of AGC. In order to solve the problem of flexible links, the method of using supercapacitor energy storage system or electrochemical energy storage system to participate in thermal power units to achieve AGC joint adjustment has been gradually tried this year. The supercapacitor energy storage system has a million times of charge and discharge capacity and fast charge and discharge conversion capacity, while the electrochemical energy storage system has continuous power operation capacity and thousands of times of charge and discharge capacity. Therefore, the supercapacitor energy storage system and the electrochemical energy storage system represented by lithium batteries are combined to form a hybrid energy storage system to participate in the AGC regulation of thermal power plants. It can give full play to the advantages of the two energy storage systems and reduce the frequency of traditional thermal power units participating in AGC regulation. When traditional thermal power units cannot meet the regulation mileage requirements by relying solely on hybrid energy storage systems, the advantages of hybrid energy storage and thermal power units can be used to participate in the AGC regulation of the power grid.

[0004] Compared with the existing technology, the existing method for hybrid energy storage to participate in the AGC joint regulation of thermal power plants only describes the order in which different types of energy storage participate in the regulation, but ignores the actual energy storage status of each energy storage system before the instruction is issued, and ignores the time that can be charged and discharged under the given charge and discharge instructions, which affects the regulation accuracy. Summary of the invention

[0005] The purpose of the present invention is to provide a control method and device for hybrid energy storage participating in the AGC joint regulation of thermal power plants, taking into account the real-time status of each energy storage system, as well as the regulation instructions and key parameters of the regulation time issued by the AGC to the thermal power plant, giving full play to the regulation advantages of the energy storage system, and improving the overall operating economy of the hybrid energy storage system participating in the AGC regulation of the thermal power plant.

[0006] In order to achieve the above objectives, the solution of this application is:

[0007] According to the first aspect of the present application, a control method for a hybrid energy storage system participating in AGC joint regulation of a thermal power plant is proposed, characterized in that the hybrid energy storage system includes N energy storage subsystems, N is an integer greater than or equal to 2, and the N energy storage subsystems include at least two energy storage subsystems with different energy storage forms; the control method includes:

[0008] Obtain the AGC adjustment instructions and adjustment duration sent by the dispatcher to the thermal power plant, as well as the real-time operating power P of the thermal power plant hr ;

[0009] According to the AGC adjustment instruction and the real-time operating power P of the thermal power plant hr Determine the total regulated power target value that needs to be regulated in the thermal power plant;

[0010] The real-time operating power, rated operating power and state of charge of the N energy storage subsystems are respectively obtained, and the maximum power change of the N energy storage subsystems is respectively determined;

[0011] According to the total adjustment power target value and the maximum power change of the N energy storage subsystems, determine the subject participating in the adjustment and the corresponding operation target power; the priority order of the adjustment is: the energy storage subsystem with a smaller sequence number is given priority, and the thermal power plant has the lowest priority;

[0012] According to the subject involved in the regulation and the corresponding operating target power, the charge state of the energy storage subsystem involved in the regulation determines the sustainable working time of the subject involved in the regulation;

[0013] When the sustainable working time of a certain regulating entity is less than the regulation duration time sent by the dispatcher to the thermal power plant, after the sustainable working time of a certain regulating entity is reached, the target power borne by the certain regulating entity will be distributed among the energy storage subsystem and the thermal power plant with regulation margin according to the priority order of the regulation.

[0014] According to some embodiments, the ordering principle of the N energy storage subsystems is: energy storage subsystems with more charge and discharge times and faster adjustment speed are prioritized, and energy storage subsystems with higher storage energy and longer continuous operation time are ranked later.

[0015] According to some embodiments, the AGC adjustment instruction and the real-time operating power P of the thermal power plant hr Determine the total power target value that needs to be adjusted in the thermal power plant; specifically: total power target value ΔP = P t -P hr ; If the value is less than 0, the total regulated power needs to be adjusted downward; if the value is greater than 0, the total regulated power needs to be adjusted upward.

[0016] According to some embodiments, the maximum power change amount calculation method of the energy storage subsystem is specifically as follows:

[0017] ΔP i =|P ie -P ir |, where: i is the number of the energy storage subsystem, 1≤i≤N, ΔP i is the maximum power change of the i-th energy storage subsystem, P ie is the rated operating power of the i-th energy storage subsystem, P ir is the real-time operating power of the i-th energy storage subsystem; when the energy storage subsystem is in the charging state, the real-time operating power is a negative value, and when it is in the discharging state, the real-time operating power is a positive value.

[0018] According to some embodiments, the subject involved in the regulation and the corresponding operating target power are determined according to the total regulation power target value and the maximum power change of the N energy storage subsystems, specifically:

[0019] The total regulated power target value is ΔP, ΔP i is the maximum power change of the i-th energy storage subsystem, P ir is the real-time operating power of the i-th energy storage subsystem, P ie is the rated operating power of the i-th energy storage subsystem;

[0020] If ΔP ≤ ΔP 1 , then only the first energy storage subsystem needs to be adjusted to meet the AGC adjustment target value requirement, and the operating target power after the first energy storage subsystem participates in the adjustment is P 1t=P 1r +ΔP;

[0021] If ΔP 1 <ΔP≤ΔP 1 +ΔP 2 , the first energy storage subsystem and the second energy storage subsystem need to be adjusted together to meet the AGC adjustment target value requirement; the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1e , the operating target power after the second energy storage subsystem participates in the regulation is P 2t =P 2r +ΔP-ΔP 1 ;

[0022] By analogy, ΔP 1 +…+ΔP i-1 <ΔP≤ΔP 1 +…+ΔP i , the first i energy storage subsystems need to be adjusted together to meet the AGC adjustment target value requirement; the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1e , ..., the target power after the i-1 energy storage subsystem participates in the regulation is P (i-1)t =P (i-1)e , the target power after the i-th energy storage subsystem participates in the regulation is P it =P ir +ΔP-(ΔP 1 +…+ΔP i-1 );

[0023] If ΔP<ΔP 1 +…+ΔP N , then N energy storage subsystems and thermal power units need to be adjusted together to meet the AGC adjustment target value requirements. The operating target powers of N energy storage subsystems after adjustment are P 1e ,…P Ne The target power of the thermal power plant after regulation is P Ft =P t -(ΔP 1 +…+ΔP N ).

[0024] According to some embodiments, the sustainable working time of the subject participating in the regulation is determined according to the subject participating in the regulation and the corresponding operating target power, the charge state of the energy storage subsystem participating in the regulation, and the regulation duration sent by the dispatcher to the thermal power plant, specifically:

[0025] If the i-th energy storage subsystem that needs to participate in the regulation participates in the regulation of the operating target power P it>0, the continuous discharge time is T ic =η isoc *E ir / P it , P it <0, the continuous discharge time is T ic =(1-η isoc )*E ir / P it ; where η isoc is the remaining power value of the i-th energy storage subsystem, E ir is the rated capacity of the i-th energy storage subsystem.

[0026] According to some embodiments, the energy storage subsystem with a large number of charge and discharge times and a fast adjustment speed includes at least one of a supercapacitor energy storage system and a flywheel energy storage system, and the energy storage subsystem type with high storage energy and long continuous operation time includes an electrochemical energy storage system.

[0027] According to a second aspect of the present application, a control device for a hybrid energy storage system participating in AGC joint regulation of a thermal power plant is proposed, wherein the hybrid energy storage system comprises N energy storage subsystems, N is an integer greater than or equal to 2, and the N energy storage subsystems include at least two energy storage subsystems with different energy storage forms; the control device comprises:

[0028] The instruction acquisition unit is used to obtain the AGC adjustment instruction and adjustment duration sent by the dispatcher to the thermal power plant, as well as the real-time operating power P of the thermal power plant. hr ;

[0029] The total adjustment power target value calculation unit is used to calculate the total adjustment power target value according to the AGC adjustment instruction and the real-time operation power P of the thermal power plant. hr Determine the total regulated power target value that needs to be regulated in the thermal power plant;

[0030] The regulating subject determination unit is used to respectively obtain the real-time operating power, rated operating power and charge state of N energy storage subsystems, and respectively determine the maximum power change of the N energy storage subsystems; according to the total regulating power target value and the maximum power change of the N energy storage subsystems, determine the subject participating in the regulation and the corresponding operating target power; the priority order of regulation is: the energy storage subsystem with a smaller serial number is given priority, and the thermal power plant has the lowest priority;

[0031] The secondary adjustment unit is used to determine the sustainable working time of the participating regulation subject according to the participating regulation subject and the corresponding operating target power, and the charge state of the participating regulation energy storage subsystem; when the sustainable working time of a participating regulation subject is less than the regulation duration time sent by the dispatcher to the thermal power plant, then after the sustainable working time of a participating regulation subject is reached, the target power borne by the participating regulation subject will be distributed among the energy storage subsystem and the thermal power plant with regulation margin according to the priority order of the regulation.

[0032] According to the third aspect of the present application, an electronic device is proposed, characterized in that it includes: a processor; and a memory, storing computer instructions, when the computer instructions are executed by the processor, the processor executes the control method for the hybrid energy storage system to participate in the AGC joint regulation of the thermal power plant.

[0033] According to a fourth aspect of the present application, a non-transitory computer storage medium is proposed, which stores a computer program. When the computer program is executed by multiple processors, the processors execute the control method for the aforementioned hybrid energy storage system to participate in the AGC joint regulation of a thermal power plant.

[0034] After adopting the above scheme, the beneficial effects of the present invention compared with the prior art are:

[0035] The present invention takes into account the real-time status of each energy storage system, and also takes into account the key parameters of the adjustment instructions and adjustment time issued by the AGC to the thermal power plant. The control method is more operable, can improve the flexible economy of the operation of the thermal power plant, and improve the key indicators of the adjustment accuracy, response rate and response time of the thermal power plant participating in the AGC. During normal operation, when the dispatching AGC issues a power adjustment instruction to the thermal power plant, the adjustment instruction is determined to adjust the participating objects and the adjustment power according to the order of priority of each energy storage subsystem and the last of the thermal power plant, so that each energy storage subsystem quickly participates in the charging and discharging power control and quickly meets the needs of the AGC short-term adjustment; when the AGC instruction issued by the dispatching is large in adjustment amplitude and long in duration, and it is difficult to meet the requirements by each energy storage subsystem alone, the power adjustment of the thermal power unit is finally started. At this time, the power adjustment mileage and adjustment time of the thermal power unit are much shorter than the power adjustment mileage and adjustment time of the thermal power unit AGC response alone when there is no hybrid energy storage. At the same time, the duration of the energy storage subsystem is measured. When the adjustment time requirements issued by the dispatching AGC are not met, the participating objects and the adjustment power are adjusted for the second time. When large-scale access of new energy sources to thermal power units requires frequent adjustments, the economic benefits of applying this method are more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1It is a schematic diagram of a control method for a hybrid energy storage system to participate in AGC joint regulation of a thermal power plant provided in an embodiment of the present application;

[0037] Figure 2 This is a system structure diagram of a hybrid energy storage system connected to a thermal power plant provided in an embodiment of the present application;

[0038] Figure 3 It is a schematic diagram of a control device for a hybrid energy storage system participating in AGC joint regulation of a thermal power plant provided in an embodiment of the present application;

[0039] Figure 4 It is a structural diagram of an electronic device provided by this application. DETAILED DESCRIPTION

[0040] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0041] In the prior art, in the technology of hybrid energy storage participating in the AGC joint regulation of thermal power plants, only the order of different types of energy storage participating in the regulation is studied, but the actual energy storage state of each energy storage system before the instruction is issued is ignored, and the time that can be charged and discharged under the given charge and discharge instructions is ignored, which affects the regulation accuracy. In view of this, the present application proposes a control method for hybrid energy storage system participating in the AGC joint regulation of thermal power plants.

[0042] The hybrid energy storage system targeted by the present application includes N energy storage subsystems, where N is an integer greater than or equal to 2, and the N energy storage subsystems include at least two energy storage subsystems with different energy storage forms. The N energy storage subsystems are sorted, and the sorting principle is that the energy storage subsystems with many charge and discharge times and fast adjustment speeds are prioritized, and the energy storage subsystems with high storage energy and long continuous operation time are sorted later. Energy storage subsystems with many charge and discharge times and fast adjustment speeds include supercapacitor energy storage systems, flywheel energy storage systems, etc., so if the energy storage system includes supercapacitor energy storage systems and / or flywheel energy storage systems, they are sorted relatively high. The types of energy storage subsystems with high storage energy and long continuous operation time, such as electrochemical energy storage systems, are sorted relatively low.

[0043] like Figure 1 As shown, a control method for a hybrid energy storage system participating in AGC joint regulation of a thermal power plant in the present application includes the following steps:

[0044] S101: Obtain the AGC adjustment instruction and adjustment duration sent by the dispatcher to the thermal power plant, as well as the real-time operating power P of the thermal power plant. hr .

[0045] The power grid dispatching system sends the AGC regulation to the thermal power plant, including the AGC regulation instruction P t and adjustment duration T t. Get the above AGC adjustment instruction P t and adjustment duration T t , and monitor the real-time operating power P of the thermal power plant hr .

[0046] S102: According to the AGC adjustment instruction and the real-time operating power P of the thermal power plant hr Determine the total regulated power target value that needs to be regulated in the thermal power plant.

[0047] Specifically, the total adjustment power target value ΔP = P t -P hr ; If the value is less than 0, the total regulated power needs to be adjusted downward; if the value is greater than 0, the total regulated power needs to be adjusted upward.

[0048] S103: respectively obtain the real-time operating power, rated operating power and state of charge of the N energy storage subsystems, and respectively determine the maximum power change of the N energy storage subsystems.

[0049] Get the real-time operating power P of the energy storage subsystem respectively ir , Rated operating power P ie In this embodiment, the state of charge is represented by the remaining power value of the energy storage subsystem, denoted as η isoc , is the remaining power value of the i-th energy storage subsystem.

[0050] The specific calculation method of the maximum power change of the energy storage subsystem is:

[0051] ΔP i =|P ie -P ir |, where: i is the number of the energy storage subsystem, 1≤i≤N, ΔP i is the maximum power change of the i-th energy storage subsystem, P ie is the rated operating power of the i-th energy storage subsystem, P ir is the real-time operating power of the i-th energy storage subsystem; when the energy storage subsystem is in the charging state, the real-time operating power is a negative value, and when it is in the discharging state, the real-time operating power is a positive value.

[0052] S104: Determine the subjects involved in the regulation and the corresponding operating target powers according to the total regulation power target value and the maximum power change of the N energy storage subsystems; the priority order of regulation is: the energy storage subsystem with a smaller serial number takes priority, and the thermal power plant has the lowest priority.

[0053] In some embodiments, the specific method for determining the subject involved in the regulation and the corresponding operating target power is:

[0054] The total regulated power target value is ΔP, ΔP iis the maximum power change of the i-th energy storage subsystem, P ir is the real-time operating power of the i-th energy storage subsystem, P ie is the rated operating power of the i-th energy storage subsystem;

[0055] If ΔP ≤ ΔP 1 , then only the first energy storage subsystem needs to be adjusted to meet the AGC adjustment target value requirement, and the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1r +ΔP;

[0056] If ΔP 1 <ΔP≤ΔP 1 +ΔP 2 , the first energy storage subsystem and the second energy storage subsystem need to be adjusted together to meet the AGC adjustment target value requirement; the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1e , the operating target power after the second energy storage subsystem participates in the regulation is P 2t =P 2r +ΔP-ΔP 1 ;

[0057] By analogy, ΔP 1 +…+ΔP i-1 <ΔP≤ΔP 1 +…+ΔP i , the first i energy storage subsystems need to be adjusted together to meet the AGC adjustment target value requirement; the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1e , ..., the target power after the i-1 energy storage subsystem participates in the regulation is P (i-1)t =P (i-1)e , the target power after the i-th energy storage subsystem participates in the regulation is P it =P ir +ΔP-(ΔP 1 +…+ΔP i-1 );

[0058] If ΔP<ΔP 1 +…+ΔP N , then N energy storage subsystems and thermal power units need to be adjusted together to meet the AGC adjustment target value requirements. The operating target powers of N energy storage subsystems after adjustment are P 1e ,…P Ne The target power of the thermal power plant after regulation is P Ft =P t -(ΔP 1 +…+ΔP N ).

[0059] S105: Determine the sustainable working time of the subject participating in the regulation according to the subject participating in the regulation and the corresponding operating target power and the charge state of the energy storage subsystem participating in the regulation.

[0060] In some embodiments, the specific method for determining the sustainable working time of the subject participating in the regulation is: if the operating target power P of the i-th energy storage subsystem that needs to participate in the regulation after the regulation it >0, the continuous discharge time is T ic =η isoc *E ir / P it , P it <0, the continuous discharge time is T ic =(1-η isoc )*E ir / P it ; where η isoc is the remaining power value of the i-th energy storage subsystem, E ir is the rated capacity of the i-th energy storage subsystem.

[0061] S106: When the sustainable working time of a certain regulating entity is less than the regulating duration time sent by the dispatcher to the thermal power plant, after the sustainable working time of a certain regulating entity is reached, the target power undertaken by the certain regulating entity will be allocated among the energy storage subsystems and thermal power plants with regulating margins according to the priority order of the regulation.

[0062] Since the continuous operation time of energy storage systems such as supercapacitor energy storage systems and flywheel energy storage systems is relatively short, when the adjustment duration sent by the dispatch to the thermal power plant is relatively long, the supercapacitor energy storage system, flywheel energy storage system and other types of energy storage systems may not be able to meet the adjustment requirements. Therefore, when the sustainable working time of a certain participating regulation subject is less than the adjustment duration sent by the dispatch to the thermal power plant, after the sustainable working time of a certain participating regulation subject arrives, the target power borne by the certain participating regulation subject will be allocated among the energy storage subsystems and thermal power plants with adjustment margins according to the priority order of the adjustment.

[0063] Take N = 2 and only the first energy storage subsystem is currently involved in regulation as an example. When T 1c <T t When the sustainable working time of the first energy storage subsystem cannot meet the requirements of the scheduling AGC regulation continuous operation time, 1c After the time is up, the target power of the first energy storage subsystem needs to be distributed among the energy storage subsystems with regulation margin and the thermal power plant. 1t ≤ΔP 2 , then in T1c After the time is over, only the second energy storage subsystem can take on the adjustment task. The operating target power after the second energy storage subsystem participates in the adjustment is P 2r +P 1t ; if P 1t >ΔP 2 , then in T 1c After the time is over, the second energy storage subsystem and the thermal power unit need to be adjusted together. The operating target power after the second energy storage subsystem participates in the adjustment is P 2e The target power of the thermal power plant after regulation is P hr +P 1t -ΔP 2 .

[0064] Take N=2 and the first energy storage subsystem and the second energy storage subsystem as an example. 1c <T t When the sustainable working time of the first energy storage subsystem cannot meet the requirements of the scheduling AGC regulation continuous operation time, 1c After the time is up, the target power of the first energy storage subsystem needs to be distributed among the energy storage subsystems with regulation margin and the thermal power plant. 1t ≤ΔP 2 -(ΔP-ΔP 1 ), then in T 1c After the time is over, only the second energy storage subsystem can take on the adjustment task. The operating target power after the second energy storage subsystem participates in the adjustment is P 2r +ΔP-ΔP 1 +P 1t ; if P 1t >ΔP 2 -(ΔP-ΔP 1 ), then in T 1c After the time is over, the second energy storage subsystem and the thermal power unit need to be adjusted together. The operating target power after the second energy storage subsystem participates in the adjustment is P 2e The target power of the thermal power plant after regulation is P hr +P 1t -[ΔP 2 -(ΔP-ΔP 1 )].

[0065] Take N = 2 and the first energy storage subsystem, the second energy storage subsystem and the thermal power unit as an example. 1c <T t When the sustainable working time of the first energy storage subsystem cannot meet the requirements of the scheduling AGC regulation continuous operation time, 1c After the time is up, the target power of the first energy storage subsystem needs to be allocated to the thermal power plant.1c After the time is over, the target power of the thermal power plant after regulation is P t -(ΔP 1 +…+ΔP N )+P 1t .

[0066] Taking N>2 and the first i energy storage subsystems jointly regulating to meet the AGC regulation target value requirement as an example, there is a sustainable working time T of the mth energy storage subsystem mc <T t At T mc After the moment ends, the target power of the mth energy storage subsystem needs to be distributed among the energy storage subsystems with regulation margin and the thermal power plant. mt ≤ΔP i -[ΔP-(ΔP 1 +…+ΔP i-1 )], then in T mc After the time is over, the target power of the mth energy storage subsystem is adjusted to the i-th energy storage subsystem. The target power of the i-th energy storage subsystem after adjustment is P ir +ΔP-(ΔP 1 +…+ΔP i-1 )+P 1t ; if P mt >ΔP i -[ΔP-(ΔP 1 +…+ΔP i-1 )], if i = N, the target power of the mth energy storage subsystem needs to be adjusted to the ith energy storage subsystem and the thermal power unit for joint regulation. The target power of the ith energy storage subsystem after regulation is P ie The target power of the thermal power plant after regulation is P hr +P mt -{ΔP i -[ΔP-(ΔP 1 +…+ΔP i-1 )]}, if i<N, that is, there are other energy storage subsystems with regulation margin, the i-th energy storage subsystem and other energy storage subsystems with regulation margin will be regulated together. If there is still a shortage, the thermal power plant will bear it together.

[0067] Taking N>2 and N energy storage subsystems and thermal power units jointly regulating to meet the AGC regulation target value requirement as an example, there is a sustainable working time T of the mth energy storage subsystem mc <T t At T mc After the time T is over, the target power of the mth energy storage subsystem needs to be allocated to the thermal power plant. mcAfter the time is over, the target power of the thermal power plant after regulation is P t -(ΔP 1 +…+ΔP N )+P mt .

[0068] The method of the present application is described below in detail by taking a hybrid energy storage system composed of a supercapacitor energy storage system and an electrochemical energy storage system as an example. The supercapacitor energy storage system has many charge and discharge times and a fast adjustment speed, and is designated as the first energy storage subsystem. The electrochemical energy storage system has high energy storage and a long continuous operation time, and is designated as the second energy storage subsystem. The power and duration of the three types of resources participating in the regulation are allocated in the order that the supercapacitor energy storage system participates in the regulation first, the electrochemical energy storage system participates in the regulation later, and the thermal power plant AGC regulation system participates in the regulation last. In this embodiment, the control method for the hybrid energy storage system to participate in the joint regulation of the thermal power plant AGC includes the following steps:

[0069] S201: Obtain the AGC adjustment instruction P sent by the dispatcher to the thermal power plant t and adjustment duration T t , and the real-time operating power P of the thermal power plant hr .

[0070] S202: Calculate the total power target value ΔP=P that needs to be adjusted in the thermal power plant t -P hr ; If the value is less than 0, the total regulated power needs to be adjusted downward; if the value is greater than 0, the total regulated power needs to be adjusted upward.

[0071] S203: Obtaining the real-time operating power P of the supercapacitor energy storage system cr , Rated operating power P ce and the remaining capacity of the supercapacitor energy storage system η csoc When the supercapacitor energy storage system is in the charging state, the real-time operating power is negative, and when it is in the discharging state, the real-time operating power is positive; the maximum power change of the supercapacitor energy storage system is: ΔP C =|P Ce -P Cr |. Obtain the real-time operating power P of the electrochemical energy storage system Lr , Rated operating power P Le and the remaining capacity value η of the electrochemical energy storage system Lsoc When the electrochemical energy storage system is in the charging state, the real-time operating power is negative, and when it is in the discharging state, the real-time operating power is positive; the maximum power change of the electrochemical energy storage system ΔP L =|P Le -P Lr |.

[0072] S204: According to the total adjustment power target value and the maximum power change of the two energy storage subsystems, determine the subjects participating in the adjustment and the corresponding operating target power; the priority order of adjustment is: supercapacitor energy storage system first, electrochemical energy storage system second, and thermal power plant has the lowest priority.

[0073] Comparison of the maximum power change ΔP of electrochemical energy storage system and supercapacitor energy storage system L , ΔP C Relationship with ΔP; if ΔP≤ΔP C , it means that only the supercapacitor energy storage system needs to perform charge and discharge power conversion to meet the AGC adjustment target value requirement. The operating target power after the supercapacitor energy storage system participates in the adjustment is P ct =P cr +ΔP.

[0074] As ΔP C <ΔP<ΔP L +ΔP C , it means that the supercapacitor energy storage system and the electrochemical energy storage system need to be jointly regulated to meet the AGC regulation target value requirements; then the target power of the supercapacitor battery energy storage system is in full power state, that is, P ct =P ce ; The target power after the battery energy storage system participates in the regulation is P Lt =P Lr +ΔP-ΔP C .

[0075] If ΔP>ΔP L +ΔP C , it means that the supercapacitor energy storage system, electrochemical energy storage system and thermal power unit need to be adjusted together to meet the AGC adjustment target requirements; the supercapacitor energy storage system and the electrochemical energy storage system both need to be adjusted to full power state, and the operating target powers after adjustment are respectively P ct =P ce and P Lt =P Le The target power of thermal power plant regulation is P Ft =P t -(ΔP L +ΔP C ).

[0076] S205: Determine the sustainable working time of the subject participating in the regulation according to the subject participating in the regulation and the corresponding operating target power and the charge state of the energy storage subsystem participating in the regulation.

[0077] According to the operating target power P of the supercapacitor energy storage system ctThe remaining power value of the supercapacitor energy storage system is used to calculate the sustainable operating time of the target operating power state, P ct >0, the continuous discharge time is T cc =η csoc *E cr / P ct .P ct <0, the continuous charging time is T cc =(1-η csoc )*E cr / P ct ; where η csoc is the remaining power value of the supercapacitor energy storage system, E cr is the rated capacity of the supercapacitor energy storage system.

[0078] According to the operating target power P of the electrochemical energy storage system Lt The sustainable operating time of the target operating power state is calculated by calculating the remaining power value of the electrochemical energy storage system, P Lt >0, the continuous discharge time is T Lc =η Lsoc *E Lr / P Lt .P Lt <0, the continuous charging time is T Lc =(1-η Lsoc )*E Lr / P Lt ; where η Lsoc is the remaining capacity of the electrochemical energy storage system, E Lr is the rated capacity of the electrochemical energy storage system.

[0079] S206: When the sustainable working time of a certain regulating entity is less than the regulating duration time sent by the dispatcher to the thermal power plant, after the sustainable working time of a certain regulating entity is reached, the target power undertaken by the certain regulating entity will be allocated among the energy storage subsystems and thermal power plants with regulating margins according to the priority order of the regulation.

[0080] If only the supercapacitor energy storage system is currently responsible for regulation, the sustainable operation time of the supercapacitor energy storage system is short. It is necessary to compare the sustainable operation time T of the supercapacitor. cc The duration T of the dispatch to the thermal power plant t . Such as T cc >T t , indicating that the supercapacitor can meet the requirements of scheduling AGC to adjust the continuous operation time. cc <T t , it means that the energy duration of the supercapacitor cannot meet the continuous operation requirements. If Pct ≤ΔP L , then in T cc After the time is over, the electrochemical energy storage system will take on the adjustment task alone. The operating target power of the electrochemical energy storage system after adjustment is P Lr +P ct ; if P ct >ΔP L , then in T cc After the time is over, the electrochemical energy storage system and the thermal power unit need to be adjusted together. The operating target power after the electrochemical energy storage system participates in the adjustment is P Le The target power of the thermal power plant after regulation is P hr +P ct -ΔP L .

[0081] If the current regulation is jointly regulated by the supercapacitor energy storage system and the electrochemical energy storage system, when T cc <T t The sustainable working time of the supercapacitor energy storage system cannot meet the requirements of the scheduling AGC regulation continuous operation time. cc After the time is up, the target power of the supercapacitor energy storage system needs to be distributed between the electrochemical energy storage system and the thermal power plant. ct ≤ΔP L -(ΔP-ΔP C ), then in T cc After the time is over, only the electrochemical energy storage system needs to adjust the task. The operating target power after the electrochemical energy storage system participates in the adjustment is P Lr +ΔP-ΔP C +P ct ; if P ct >ΔP L -(ΔP-ΔP C ), then in T cc After the time is over, the electrochemical energy storage system and the thermal power unit need to be adjusted together. The operating target power after the electrochemical energy storage system participates in the adjustment is P Le The target power of the thermal power plant after regulation is P hr +P ct -[ΔP L -(ΔP-ΔP C )].

[0082] If the current regulation is jointly regulated by the supercapacitor energy storage system, electrochemical energy storage system and thermal power generation unit, when T cc <T t The sustainable working time of the supercapacitor energy storage system cannot meet the requirements of the scheduling AGC regulation continuous operation time. ccAfter the time is up, the target power that the supercapacitor energy storage system will bear needs to be allocated to the thermal power plant. cc After the time is over, the target power of the thermal power plant after regulation is P t -(ΔP C +ΔP L )+P ct .

[0083] A hybrid energy storage system connected to a thermal power plant system structure diagram implementation example Figure 2 As shown. The rated capacity of the thermal power plant unit is 600MW, and the rated capacity of the supercapacitor energy storage system is 2MW / 1min. The electrochemical energy storage system is a lithium iron phosphate battery energy storage system with a rated capacity of 15MW / 5MWh.

[0084] In normal operation, if the dispatcher does not send AGC to the thermal power plant to adjust the DC, the supercapacitor and electrochemical energy storage system are both in standby mode, that is, the active and reactive outputs are both 0. They can receive instructions at any time to participate in the regulation.

[0085] For example, in a certain state, the output active power of the thermal power plant is 400MW, and the supercapacitor energy storage and lithium battery energy storage systems are both in standby state. At this time, the dispatching AGC needs to adjust the active power of the thermal power plant to 402MW, and the duration is 50s. According to the technical solution proposed in the present invention, it is only necessary to adjust the supercapacitor system from the standby state to the 2MW discharge state to meet the adjustment requirements of the dispatching AGC. If the dispatching AGC issues an adjustment instruction to adjust the active power of the thermal power plant to 415MW, the duration is 100s. It is necessary to adjust the supercapacitor energy storage from the standby state to the 2MW discharge state at the same time. The duration is the maximum working time of the supercapacitor is 60S. The lithium battery energy storage system is adjusted from the standby state to the 13MW active discharge state, and the maintenance time is 0s to 60s. After the energy of the supercapacitor energy storage system is released, the active power of the lithium battery output energy storage system is adjusted from 13MW to the 15MW active discharge state, and the maintenance time period is 60s to 100s. Under these two types of regulation instructions, there is no need for thermal power units to participate in power regulation, and the hybrid energy storage system alone can meet the dispatching AGC regulation requirements.

[0086] If the power adjustment command issued by the dispatching AGC has a large adjustment range, it needs to be adjusted from 400MW to 440MW, and the duration is 120s. The hybrid energy storage system and the thermal power unit need to work together to meet the requirements. The supercapacitor energy storage needs to be adjusted from the standby state to the 2MW discharge state. The duration is the maximum working time of the supercapacitor is 60S. The lithium battery energy storage system is adjusted from the standby state to the 15MW active discharge state, and the maintenance time is 0s to 120s. The active power regulation of the thermal power plant changes from 400MW to 423MW, and the maintenance time is 0s to 60s, and from 423MW to 425MW. The maintenance time period is 60s to 120s.

[0087] like Figure 3 The figure shows a control device 300 for a hybrid energy storage system participating in the AGC joint regulation of a thermal power plant provided by an embodiment of the present application. The control device comprises: an instruction acquisition unit 301, a total regulation power target value calculation unit 302, a regulation subject determination unit 303 and a secondary adjustment unit 304. Among them:

[0088] The instruction acquisition unit 301 is used to acquire the AGC adjustment instruction and adjustment duration sent by the dispatcher to the thermal power plant, as well as the real-time operating power P of the thermal power plant. hr .

[0089] The total adjustment power target value calculation unit 302 is used to calculate the total adjustment power target value according to the AGC adjustment instruction and the real-time operation power P of the thermal power plant. hr Determine the total regulated power target value that needs to be regulated in the thermal power plant.

[0090] The regulating subject determination unit 303 is used to obtain the real-time operating power, rated operating power and charge state of N energy storage subsystems respectively, and determine the maximum power change of the N energy storage subsystems respectively; according to the total regulating power target value and the maximum power change of the N energy storage subsystems, determine the subjects participating in the regulation and the corresponding operating target power; the priority order of regulation is: the energy storage subsystem with a smaller serial number takes priority, and the thermal power plant has the lowest priority.

[0091] The secondary adjustment unit 304 is used to determine the sustainable working time of the participating regulation subject according to the participating regulation subject and the corresponding operating target power, and the charge state of the participating regulation energy storage subsystem; when the sustainable working time of a participating regulation subject is less than the regulation duration time sent by the dispatcher to the thermal power plant, then after the sustainable working time of a participating regulation subject is reached, the target power borne by the participating regulation subject will be allocated among the energy storage subsystem and the thermal power plant with regulation margin according to the priority order of the regulation.

[0092] A control device for a hybrid energy storage system participating in the AGC joint regulation of a thermal power plant in the present application performs functions similar to those of the aforementioned method. For details, please refer to the previous description and will not be repeated here.

[0093] Figure 4 The structure diagram of an electronic device provided by the present application is shown. It includes a processor and a memory. The memory stores computer instructions. When the computer instructions are executed by the processor, the processor executes the computer instructions to achieve the following. Figure 1 The method and refinement scheme shown.

[0094] It should be understood that the above device embodiments are only illustrative, and the device disclosed in the present invention can also be implemented in other ways. For example, the division of units / modules described in the above embodiments is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0095] In addition, unless otherwise specified, each functional unit / module in each embodiment of the present invention may be integrated into one unit / module, each unit / module may exist physically separately, or two or more units / modules may be integrated together. The above-mentioned integrated unit / module may be implemented in the form of hardware or in the form of a software program module.

[0096] If the integrated unit / module is implemented in the form of hardware, the hardware may be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes but is not limited to transistors, memristors, etc. If not otherwise specified, the processor or chip may be any appropriate hardware processor, such as a CPU, a GPU, an FPGA, a DSP, an ASIC, etc. If not otherwise specified, the on-chip cache, the off-chip memory, and the memory may be any appropriate magnetic storage medium or magneto-optical storage medium, such as a resistive random access memory RRAM (Resistive Random Access Memory), a dynamic random access memory DRAM (Dynamic Random Access Memory), a static random access memory SRAM (Static Random-Access Memory), an enhanced dynamic random access memory EDRAM (Enhanced Dynamic Random Access Memory), a high-bandwidth memory HBM (High-Bandwidth Memory), a hybrid memory cube HMC (Hybrid Memory Cube), etc.

[0097] If the integrated unit / module is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned memory includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0098] The present application also provides a non-transitory computer storage medium storing a computer program. When the computer program is executed by a plurality of processors, the processors execute the following Figure 1 The method and refinement scheme shown.

[0099] It should be clearly understood that the present application describes how to form and use specific examples, but the present application is not limited to any details of these examples. On the contrary, based on the teaching of the content disclosed in the present application, these principles can be applied to many other embodiments.

[0100] In addition, it should be noted that the above figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0101] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a hybrid energy storage system to participate in AGC joint regulation of a thermal power plant, characterized in that: The hybrid energy storage system includes N energy storage subsystems, where N is an integer greater than or equal to 2, and the N energy storage subsystems include at least two energy storage subsystems with different energy storage forms; The control method comprises: Obtain the AGC adjustment instructions and adjustment duration sent by the dispatcher to the thermal power plant, as well as the real-time operating power P of the thermal power plant hr ; According to the AGC adjustment instruction and the real-time operating power P of the thermal power plant hr Determine the total regulated power target value that needs to be regulated in the thermal power plant; The real-time operating power, rated operating power and state of charge of the N energy storage subsystems are respectively obtained, and the maximum power change of the N energy storage subsystems is respectively determined; According to the total adjustment power target value and the maximum power change of the N energy storage subsystems, determine the subject participating in the adjustment and the corresponding operation target power; the priority order of the adjustment is: the energy storage subsystem with a smaller sequence number is given priority, and the thermal power plant has the lowest priority; According to the subject involved in the regulation and the corresponding operating target power, the charge state of the energy storage subsystem involved in the regulation determines the sustainable working time of the subject involved in the regulation; When the sustainable working time of a certain regulating entity is less than the regulation duration time sent by the dispatcher to the thermal power plant, after the sustainable working time of a certain regulating entity is reached, the operating target power borne by the certain regulating entity will be distributed among the energy storage subsystems and thermal power plants with regulation margin according to the priority order of the regulation.

2. The method according to claim 1, characterized in that The sorting principle of the N energy storage subsystems is: the energy storage subsystems with more charge and discharge times and faster adjustment speed are prioritized, and the energy storage subsystems with higher storage energy and longer continuous operation time are ranked later.

3. The method according to claim 1, characterized in that The AGC adjustment instruction and the real-time operating power P of the thermal power plant hr Determine the total power target value that needs to be adjusted in the thermal power plant; specifically: total power target value ΔP = P t -P hr ; If the value is less than 0, the total regulated power needs to be adjusted downward; if the value is greater than 0, the total regulated power needs to be adjusted upward.

4. The method according to claim 1, characterized in that The specific method for calculating the maximum power change of the energy storage subsystem is: ΔP i =|P ie -P ir |, where: i is the number of the energy storage subsystem, 1≤i≤N, ΔP i is the maximum power change of the i-th energy storage subsystem, P ie is the rated operating power of the i-th energy storage subsystem, P ir is the real-time operating power of the i-th energy storage subsystem; when the energy storage subsystem is in the charging state, the real-time operating power is a negative value, and when it is in the discharging state, the real-time operating power is a positive value.

5. The method according to claim 1, characterized in that The determining of the subject involved in the regulation and the corresponding operating target power according to the total regulation power target value and the maximum power change of the N energy storage subsystems is specifically: The total regulated power target value is ΔP, ΔP i is the maximum power change of the i-th energy storage subsystem, P ir is the real-time operating power of the i-th energy storage subsystem, P ie is the rated operating power of the i-th energy storage subsystem; If ΔP≤ΔP1, only the first energy storage subsystem needs to be adjusted to meet the AGC adjustment target value requirement. The operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1r +ΔP; If ΔP1<ΔP≤ΔP1+ΔP2, the first energy storage subsystem and the second energy storage subsystem need to be adjusted together to meet the AGC adjustment target value requirement; the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1e , the operating target power after the second energy storage subsystem participates in the regulation is P 2t =P 2r +ΔP-ΔP1; And so on, ΔP1+…+ΔP i-1 <ΔP≤ΔP1+…+ΔP i , the first i energy storage subsystems need to be adjusted together to meet the AGC adjustment target value requirement; the operating target power after the first energy storage subsystem participates in the adjustment is P 1t =P 1e , ..., the target power after the i-1 energy storage subsystem participates in the regulation is P (i-1)t =P (i-1)e , the target power after the i-th energy storage subsystem participates in the regulation is P it =P ir +ΔP-(ΔP1+…+ΔP i-1 ); If ΔP<ΔP1+…+ΔP N , then N energy storage subsystems and thermal power units need to be adjusted together to meet the AGC adjustment target value requirements. The operating target powers of N energy storage subsystems after adjustment are P 1e ,…P Ne The target power of the thermal power plant after regulation is P Ft =P t -(ΔP1+…+ΔP N ).

6. The method according to claim 1, characterized in that The sustainable working time of the subject participating in the regulation is determined according to the subject participating in the regulation and the corresponding operating target power, the charge state of the energy storage subsystem participating in the regulation, and the regulation duration sent by the dispatcher to the thermal power plant, specifically: If the i-th energy storage subsystem that needs to participate in the regulation participates in the regulation of the operating target power P it >0, the continuous discharge time is T ic =η isoc *E ir / P it , P it <0, the continuous discharge time is T ic =(1-η isoc )*E ir / P it ; where η isoc is the remaining power value of the i-th energy storage subsystem, E ir is the rated capacity of the i-th energy storage subsystem.

7. The method according to claim 2, characterized in that The energy storage subsystem with many charge and discharge times and fast adjustment speed includes at least one of a supercapacitor energy storage system and a flywheel energy storage system. The energy storage subsystem type with high storage energy and long continuous operation time includes an electrochemical energy storage system.

8. A control device for a hybrid energy storage system participating in AGC joint regulation of a thermal power plant, characterized in that: The hybrid energy storage system includes N energy storage subsystems, where N is an integer greater than or equal to 2, and the N energy storage subsystems include at least two energy storage subsystems with different energy storage forms; The control device comprises: The instruction acquisition unit is used to obtain the AGC adjustment instruction and adjustment duration sent by the dispatcher to the thermal power plant, as well as the real-time operating power P of the thermal power plant. hr ; The total adjustment power target value calculation unit is used to calculate the total adjustment power target value according to the AGC adjustment instruction and the real-time operation power P of the thermal power plant. hr Determine the total regulated power target value that needs to be regulated in the thermal power plant; The regulating subject determination unit is used to respectively obtain the real-time operating power, rated operating power and charge state of N energy storage subsystems, and respectively determine the maximum power change of the N energy storage subsystems; according to the total regulating power target value and the maximum power change of the N energy storage subsystems, determine the subject participating in the regulation and the corresponding operating target power; the priority order of regulation is: the energy storage subsystem with a smaller serial number is given priority, and the thermal power plant has the lowest priority; The secondary adjustment unit is used to determine the sustainable working time of the participating regulation subject according to the participating regulation subject and the corresponding operating target power, and the charge state of the participating regulation energy storage subsystem; when the sustainable working time of a participating regulation subject is less than the regulation duration time sent by the dispatcher to the thermal power plant, then after the sustainable working time of a participating regulation subject is reached, the target power borne by the participating regulation subject will be distributed among the energy storage subsystem and the thermal power plant with regulation margin according to the priority order of the regulation.

9. An electronic device, characterized in that: include: processor; as well as A memory storing computer instructions, which, when executed by the processor, causes the processor to execute the method according to any one of claims 1 to 7.

10. A non-transitory computer storage medium storing a computer program, which, when executed by a plurality of processors, causes the processors to execute the method according to any one of claims 1 to 7.

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