Energy storage coordination control method and device, energy storage coordinator, medium and product

Abstract

The invention relates to the technical field of power grid energy storage, and particularly discloses an energy storage coordination control method and device, an energy storage coordinator, a medium and a product. The coordination controller is respectively connected with each grid-connected point in the energy storage system; the coordination controller is in communication connection with each PCS in the energy storage system, and the method comprises the steps: obtaining the total active power and the total reactive power of the energy storage system according to the data of each grid-connected point; obtaining energy storage data of each PCS; the energy storage data at least comprises a charge state, a working state, maximum chargeable power and maximum dischargeable power; and according to a power distribution control strategy corresponding to the energy storage system, the total active power and the total reactive power, calculating the active power and the reactive power of each PCS so as to adjust the working state of each PCS. According to the scheme, energy storage coordination is carried out through the coordination controller, and the speed and precision of power grid adjustment can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid energy storage, and specifically discloses an energy storage coordination control method, device, energy storage coordinator, medium and product. Background Art

[0002] With the rapid development of new power systems, energy storage, as an indispensable flexibility adjustment tool in the power grid, has effectively alleviated the volatility problem of renewable energy power generation with its unique dual attributes of power source and load, and greatly improved the controllability and flexibility of the power system.

[0003] The power output of a single energy storage converter (PCS, Power Conversion System) is limited, and it is difficult to bear the heavy task of regulating grid fluctuations alone. In order to improve the regulation capability of energy storage converters, current new energy stations are generally equipped with a variety of grid stability regulation devices including primary frequency regulation, so as to adjust in the event of sudden changes in grid frequency, imbalance between power generation and load, or accidents, quickly restore the stability of grid frequency, and prevent further frequency fluctuations. However, the response speed and regulation accuracy of various grid stability regulation devices including primary frequency regulation are still insufficient to meet the needs of grid regulation. Summary of the invention

[0004] In view of this, the present application provides a method, device, energy storage coordination control device, medium and product, while improving the speed and accuracy of power grid regulation. The technical solution is as follows.

[0005] In a first aspect, a method for coordinated control of energy storage is provided, the method being executed by a coordinated controller; the coordinated controller is respectively connected to each grid connection point in the energy storage system; the coordinated controller is respectively connected to each PCS in the energy storage system in communication;

[0006] The method comprises:

[0007] Obtaining the total active power and total reactive power of the energy storage system according to the data of each grid connection point;

[0008] Obtaining energy storage data of each PCS; the energy storage data at least includes state of charge, working state, maximum chargeable power and maximum dischargeable power;

[0009] According to the power distribution control strategy corresponding to the energy storage system, as well as the total active power and the total reactive power, the active power and the reactive power of each PCS are calculated to adjust the working state of each PCS.

[0010] In one possible implementation, the power allocation control strategy includes at least one of proportional allocation and SOC balanced allocation; the proportional allocation strategy is used to control the working state of each PCS according to the maximum chargeable and dischargeable power of the PCS; the SOC balanced allocation strategy is used to control the working state of each PCS according to the SOC difference between the PCSs.

[0011] In a possible implementation, the active power and reactive power of each PCS are calculated according to the power allocation control strategy corresponding to the energy storage system, and the total active power and the total reactive power, including:

[0012] Obtaining a balancing target; the balancing target is used to indicate a SOC difference threshold between any two PCSs;

[0013] Calculating the maximum SOC difference between the PCSs;

[0014] If the maximum SOC difference is greater than the SOC difference threshold, the total active power is processed according to the SOC balanced distribution strategy to obtain the active power of each PCS;

[0015] If the maximum SOC difference is less than the SOC difference threshold, a power allocation coefficient is determined according to a ratio of the maximum SOC difference to the SOC difference threshold; the power allocation coefficient is used to indicate the power adjusted by the equal proportion allocation strategy and the SOC balanced allocation strategy respectively;

[0016] According to the power distribution coefficient, the total active power and the total reactive power are processed by the equal proportion distribution strategy and the SOC balanced distribution strategy respectively to obtain the active power and reactive power of each PCS.

[0017] In a possible implementation, when the power allocation control strategy is equal proportion allocation, the active power and reactive power of each PCS are calculated according to the power allocation control strategy corresponding to the energy storage system, and the total active power and the total reactive power, including:

[0018] According to the maximum chargeable and dischargeable power of each PCS and the communication status of each PCS, the maximum chargeable and dischargeable power of the energy storage system is obtained;

[0019] Determine the available power value of the energy storage system according to the minimum value between the PCS maximum dischargeable power value of the energy storage system and the active power target value of the energy storage system;

[0020] According to the available power value of the energy storage system, the maximum chargeable and dischargeable power of each PCS is proportionally distributed to obtain the active power and reactive power of each PCS.

[0021] In a possible implementation, according to the power allocation control strategy corresponding to the energy storage system, and the total active power and the total reactive power, the active power and the reactive power of each PCS are calculated, including:

[0022] Obtaining a total SOC value of each PCS;

[0023] Determining a capacity allocation coefficient of each PCS according to the SOC value of each PCS and the total SOC value of each PCS;

[0024] The active power and reactive power of each PCS are calculated according to the capacity allocation coefficient of each PCS, and the total active power and the total reactive power.

[0025] In a second aspect, an energy storage system is provided, wherein the energy storage system includes a coordination controller and various PCSs; the coordination controller is respectively connected to the various PCSs in communication; the coordination controller is respectively connected to various grid connection points in the energy storage system;

[0026] The coordination controller is used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point; obtain the energy storage data of each PCS; the energy storage data at least includes the charge state, working state, maximum chargeable power and maximum dischargeable power; according to the power allocation control strategy corresponding to the energy storage system, as well as the total active power and total reactive power, calculate the active power and reactive power of each PCS to adjust the working state of each PCS.

[0027] In a third aspect, a storage coordination control device is provided, wherein the device is arranged in a coordination controller; the coordination controller is respectively connected to each grid connection point in the energy storage system; the coordination controller is respectively connected to each PCS in the energy storage system in communication;

[0028] The device comprises:

[0029] A grid connection point monitoring module, used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point;

[0030] An energy storage acquisition module, used to acquire energy storage data of each PCS; the energy storage data at least includes charge state, working state, maximum chargeable power and maximum dischargeable power;

[0031] The working adjustment module calculates the active power and reactive power of each PCS according to the power distribution control strategy corresponding to the energy storage system, and the total active power and the total reactive power, so as to adjust the working state of each PCS.

[0032] In a fourth aspect, a coordination controller is provided, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions;

[0033] The processor includes a first processor, a second processor and a third processor; the first processor is used to process the collected signal and transmit it to the second processor;

[0034] The second processor is used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point;

[0035] The third processor is used to obtain energy storage data of each PCS; the energy storage data at least includes charge state, working state, maximum chargeable power and maximum dischargeable power;

[0036] According to the power distribution control strategy corresponding to the energy storage system, and the total active power and the total reactive power, the active power and the reactive power of each PCS are calculated to adjust the working state of each PCS.

[0037] In a fifth aspect, a computer-readable storage medium is provided, wherein at least one instruction is stored in the storage medium, and the at least one instruction is loaded and executed by a processor to implement the above-mentioned energy storage coordinated control method.

[0038] In a fifth aspect, a computer program product or a computer program is provided, wherein the computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the above-mentioned energy storage coordinated control method.

[0039] The technical solution provided by this application may have the following beneficial effects:

[0040] In an embodiment of the present application, the coordination controller is respectively connected to each grid connection point in the energy storage system, and the coordination controller is respectively connected to each PCS in the energy storage system in communication, so the coordination controller can obtain the data of each grid connection point, so as to determine whether the energy storage system needs coordination. When the energy storage system needs coordination, the total active power and total reactive power of the energy storage system can be calculated according to the data of the grid connection point, and then the energy storage data of each PCS can be obtained; finally, the coordination controller can adjust the active power and reactive power of each PCS according to the power allocation control strategy in the energy storage system and the total active power and total reactive power in the current energy storage system. In the above scheme, since the coordination controller can directly obtain each grid connection point in the energy storage system, it can directly determine the time point and degree of coordination, and in the coordination process, the coordination controller can directly obtain the energy storage data of each PCS through the communication connection, so the energy storage coordination through the coordination controller can improve the speed and accuracy of power grid regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic structural diagram of an energy storage system according to an exemplary embodiment.

[0043] Figure 2 A schematic diagram of a coordination controller according to an embodiment of the present application is shown.

[0044] Figure 3 A schematic diagram of software functional modules of a coordination control device involved in an embodiment of the present application is shown.

[0045] Figure 4 It is a method flow chart of a method for coordinated energy storage control according to an exemplary embodiment.

[0046] Figure 5 An active power control logic diagram involved in an embodiment of the present application is shown.

[0047] Figure 6 It is a logical schematic diagram of adjustment through two adjustment strategies provided in an optional embodiment of the present invention.

[0048] Figure 7 It is a regulation logic diagram of the equal proportion allocation strategy provided by an optional embodiment of the present invention.

[0049] Figure 8 A logic block diagram of an embodiment of the present application for adjusting by an equal-proportional allocation strategy and the SOC balanced allocation strategy is shown.

[0050] Fig. 9 It is a structural schematic diagram of an energy storage coordination control device provided in an embodiment of the present application.

[0051] Fig.10 It is a structural schematic diagram of a computer device provided by an optional embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0053] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0054] Figure 1 FIG. 1 is a schematic diagram showing a structure of an energy storage system according to an exemplary embodiment. Figure 1 As shown, the energy storage system includes a coordination controller and various PCSs; the coordination controller is respectively connected to the various PCSs in communication; the coordination controller is respectively connected to the various grid points in the energy storage system;

[0055] Optional, such as Figure 1 As shown, the coordination controller is in a key position in the entire energy storage system.

[0056] Optionally, the coordination controller has the function of measuring the voltage and current of the grid connection point, and can monitor up to 6 grid connection points at the same time, with the current and voltage measurement error ≤ 0.2%, and the frequency error ≤ 0.001Hz; the current and voltage sampling frequency is 100kHz, and the frequency calculation cycle is 10ms, which can quickly respond to grid fluctuations.

[0057] The IEC61850 GOOSE communication protocol is used between the coordination controller and the PCS, which can control up to 128 PCSs, realize fast power scheduling, and the communication delay is less than 1ms.

[0058] The controller coordinates the communication with the EMS server and the front-end server. The communication protocol supports the IEC61850MMS / IEC104 protocol.

[0059] The coordination controller communicates directly with the telecontrol RTU and supports the IEC104 protocol.

[0060] The coordination controller communicates with the source-grid-load-storage stabilization control terminal, supporting IEC61850 GOOSE protocol and hard-connect connection.

[0061] Optionally, the system may further include a management device, which is used to manage the system, such as managing the communication connection between various devices in the system, and the management device is connected to the coordination controller via a communication network. Optionally, the communication network is a wired network or a wireless network.

[0062] Optionally, the above-mentioned wireless network or wired network uses standard communication technology and / or protocol. The network is usually the Internet, but it can also be any other network, including but not limited to any combination of local area network, metropolitan area network, wide area network, mobile, limited or wireless network, private network or virtual private network. In some embodiments, the technology and / or format including hypertext markup language, extensible markup language, etc. are used to represent the data exchanged through the network. In addition, conventional encryption technologies such as secure socket layer, transport layer security, virtual private network, Internet protocol security, etc. can also be used to encrypt all or some links. In other embodiments, customized and / or dedicated data communication technology can also be used to replace or supplement the above-mentioned data communication technology.

[0063] The coordination controller can adjust the working status of each PCS, so as to achieve the coordination of the output of each PCS in the new energy station. Specifically, the coordination controller obtains the total active power and total reactive power of the energy storage system according to the data of each grid connection point; obtains the energy storage data of each PCS; the energy storage data at least includes the charge state, working state, maximum chargeable power and maximum dischargeable power; according to the power allocation control strategy corresponding to the energy storage system, as well as the total active power and total reactive power, calculates the active power and reactive power of each PCS to adjust the working status of each PCS.

[0064] To summarize, in the embodiments of the present application, the coordination controller is respectively connected to each grid connection point in the energy storage system, and the coordination controller is respectively connected to each PCS in the energy storage system in communication, so the coordination controller can obtain the data of each grid connection point, so as to determine whether the energy storage system needs coordination. When the energy storage system needs coordination, the total active power and total reactive power of the energy storage system can be calculated according to the data of the grid connection point, and then the energy storage data of each PCS can be obtained; finally, the coordination controller can adjust the active power and reactive power of each PCS according to the power allocation control strategy in the energy storage system and the total active power and total reactive power in the current energy storage system. In the above scheme, since the coordination controller can directly obtain each grid connection point in the energy storage system, it can directly determine the time point and degree of coordination, and in the coordination process, the coordination controller can directly obtain the energy storage data of each PCS through the communication connection, so the energy storage coordination through the coordination controller can improve the speed and accuracy of power grid regulation.

[0065] Furthermore, Figure 2 FIG. 1 shows a schematic diagram of a coordination controller according to an embodiment of the present application. Figure 2 As shown, the core processing unit of the energy storage coordination controller is composed of a first processor FPGA, a second processor DSP and a third processor ARM. The first processor FPGA is used to process the collected signal and transmit it to the second processor DSP; the second processor DSP is used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point; the third processor ARM is used to obtain the energy storage data of each PCS; the energy storage data at least includes the state of charge, working state, maximum chargeable power and maximum dischargeable power; the third processor ARM is also used to calculate the active power and reactive power of each PCS according to the power distribution control strategy corresponding to the energy storage system, as well as the total active power and total reactive power, so as to adjust the working state of each PCS.

[0066] A high-precision sampling system that combines FPGA and DSP is used. FPGA is used as the timing control center and data exchange bridge, and combined with the powerful digital signal processing capabilities of DSP, real-time processing of high-speed, multi-channel, and high-precision signals is achieved.

[0067] 1. FPGA, as the timing control center of the system, is responsible for generating accurate sampling clocks and controlling the start and stop of the A / D converter. At the same time, FPGA is also responsible for caching and preliminary processing of the digital signal output by the A / D converter, such as filtering and downsampling, to reduce the burden on the DSP.

[0068] 2. Use high-performance multi-channel A / D converters, whose high sampling rate and low noise characteristics ensure high-precision signal acquisition. The sampling clock of the A / D converter is controlled by FPGA to ensure the consistency of sampling time of each channel.

[0069] 3. DSP receives the data pre-processed by FPGA and performs complex digital signal processing algorithms, such as FFT (Fast Fourier Transform), filtering, demodulation, etc. It calculates the voltage, current, frequency and other parameter values ​​of the grid connection point, and monitors the frequency and voltage in real time. When the frequency and voltage of the grid connection point exceed the dead zone setting value, it actively performs power control such as frequency modulation, inertia support, reactive voltage regulation, etc., and writes the calculated total active power value, total reactive power value, and action status value into the shared memory. The high computing speed and precision of DSP ensure the efficiency and accuracy of data processing.

[0070] 3. The ARM processor reads the action status value, total active power value and total reactive power value in the shared memory in real time, and then calculates the active power and reactive power of each PCS through a reliable and safe power allocation algorithm. This coordinated control adopts two power allocation algorithms to adapt to different application scenarios and requirements.

[0071] Please refer to Figure 3 , which shows a schematic diagram of a software function module of a coordination control device involved in an embodiment of the present application. Figure 3 As shown, the hardware of the coordination controller adopts FPGA+DSP+ARM multi-processor architecture, so the software is also divided into FPGA program, DSP program, and ARM program.

[0072] The main function of the FPAG program is to collect data from 6 AD chips, a total of 36 channels of AD data, with a sampling rate of 100Khz, and the collected AD data is cached in DRAM.

[0073] The DSP processor uses the SYS / BIOS real-time operating system, which has very fast response time, deterministic response time, strong preemption system, optimized memory allocation and stack management, and can realize system modularization and tailorability. The biggest feature is real-time, which is very suitable for real-time control logic and calculation.

[0074] The DSP processor application software is designed in a modular manner, and mainly includes AC measurement value calculation, primary frequency modulation algorithm, reactive voltage regulation algorithm, inertia support algorithm, fault detection, and data interaction module with the ARM processor.

[0075] The ARM processor uses the RT-LINUX real-time operating system to obtain the measured and calculated values ​​and control instructions of the DSP processor in real time. When the DSP processor has any control instructions such as frequency modulation, reactive voltage regulation, inertia support, etc., the power allocation algorithm module is called to calculate the active power and reactive power settings of each PCS, and finally the power setting value is sent to the PCS through the communication module; in addition, the ARM processor program also includes a file database management module, a memory database management module, a historical data storage module, and a master-slave switching module.

[0076] Figure 4 is a method flow chart of a method for coordinated energy storage control according to an exemplary embodiment. The method is executed by a computer device, which may be Figure 1 The energy storage coordinator in the energy storage system shown. Figure 4 As shown, the method flow chart of the energy storage coordinated control method may include the following steps:

[0077] Step 401, obtaining the total active power and total reactive power of the energy storage system according to the data of each grid connection point.

[0078] Specifically, the data of the grid connection point includes the frequency and voltage data of the grid connection point. After the energy storage coordinator obtains the frequency and voltage data of the grid connection point, it can obtain the total active power and total reactive power of the energy storage system based on the data.

[0079] Optional, please refer to Figure 5 , which shows an active power control logic diagram involved in the embodiment of the present application. Figure 5 As shown, the system first obtains real-time measurement data from the grid connection point, and processes it in combination with the DSP action instructions and power regulation value (△P). The system checks whether there is an active grid load storage action instruction. If so, it enters the subsequent regulation process, that is, according to the maximum dischargeable power output of each PCS. If not, it determines whether there is a frequency regulation action instruction; if not, the process stops and returns to wait; if so, it continues to execute the power regulation process.

[0080] In the primary frequency modulation process, it is also necessary to determine whether the active power adjustment value P1 issued by the AGC (automatic generation control) system is valid. If not, the total active power P to be adjusted is directly set to △P; if valid, proceed to the next step;

[0081] Furthermore, it is also necessary to determine whether the active adjustment value P1 and △P issued by the AGC (automatic generation control) system are in the same direction; if they are in the same direction, it means that the directions of the two values ​​are consistent, and the total active power to be adjusted P = △P + P1; if they are in the opposite direction, it means that the adjustment directions of the two values ​​are opposite, and the total active power to be adjusted P = △P.

[0082] The system distributes the active power to each PCS according to the calculated total active power to be adjusted through the power allocation algorithm, and finally adjusts the output of each PCS according to the allocated active power value based on the maximum dischargeable power of each PCS.

[0083] Step 402, obtaining energy storage data of each PCS; the energy storage data at least includes charge state, working state, maximum chargeable power and maximum dischargeable power.

[0084] In the process of allocating active power to each PCS through the power allocation algorithm, in order to ensure the accuracy of allocation, the energy storage coordinator can obtain the energy storage data of each PCS, including the charge state and working state, where the working state can include the output state or charging state of the energy storage.

[0085] Step 403, according to the power allocation control strategy corresponding to the energy storage system, and the total active power and the total reactive power, the active power and the reactive power of each PCS are calculated to adjust the working state of each PCS.

[0086] Furthermore, the power allocation control strategy includes at least one of equal proportional allocation and SOC balanced allocation; the equal proportional allocation strategy is used to control the working state of each PCS according to the maximum chargeable and dischargeable power of the PCS; the SOC balanced allocation strategy is used to control the working state of each PCS according to the SOC difference between the PCSs.

[0087] Optionally, in the actual coordination process, two methods can be used to adjust the power at the same time. Step 403 can specifically adopt the following method: Figure 6 Execute as shown:

[0088] Step 601, obtaining a balance target; the balance target is used to indicate a SOC difference threshold between any two PCSs.

[0089] The balance target St may be a maximum SOC difference limit of a group of PCSs (default 3%, configurable). If this value is exceeded, the SOC is considered to be in an unbalanced state.

[0090] Step 602: Calculate the maximum SOC difference between the PCSs.

[0091] At this time, the energy storage coordinator follows up the SOC value of each PCS and calculates the maximum SOC difference S between each PCS. m , that is, S m =SOC i,max -SOC i,min , that is, the difference between the maximum SOC value and the minimum SOC value among N PCS devices.

[0092] Step 603A: If the maximum SOC difference is greater than the SOC difference threshold, the total active power is processed according to the SOC balanced distribution strategy to obtain the active power of each PCS.

[0093] If the maximum SOC difference is greater than the SOC difference threshold, it means that it is in an unbalanced state and power can be allocated according to the SOC balanced allocation strategy.

[0094] Step 603B: if the maximum SOC difference is less than the SOC difference threshold, determine the power allocation coefficient according to the ratio of the maximum SOC difference to the SOC difference threshold.

[0095] The power allocation coefficient is used to indicate the power adjusted by the equal-proportional allocation strategy and the SOC balanced allocation strategy respectively.

[0096] Specifically, the maximum capacity (PCS maximum charge and discharge power) and the coefficient Se of SOC distribution can be calculated by the following formula:

[0097] Se=Min(Sm / St,1)

[0098] When Sm>St, that is, SOC is considered unbalanced, Se=1, and all are allocated according to SOC.

[0099] Step 604, according to the power allocation coefficient, the total active power and the total reactive power are processed by the equal proportion allocation strategy and the SOC balanced allocation strategy respectively to obtain the active power and reactive power of each PCS.

[0100] Further, in step 403A, when the power allocation control strategy is equal proportion allocation, Figure 7 As shown, the active power and reactive power of each PCS can be obtained by the following steps:

[0101] Step 701, acquiring the maximum chargeable and dischargeable power of the energy storage system according to the maximum chargeable and dischargeable power of each PCS and the communication status of each PCS.

[0102] Among them, the maximum charge and discharge power flag_ComErri is the communication status of each PCS, which is 0 for normal operation and 1 for failure. When flag_ComErri=1, it means that the communication of the i-th energy storage converter fails and cannot be adjusted.

[0103] Step 702: Determine the available power value of the energy storage system according to the minimum value between the maximum dischargeable power value of the PCS of the energy storage system and the active power target value of the energy storage system.

[0104] Take PAGC and P AVLB Minimum PCS AVLB =min(PCS AVLB |,|P AGC |), as the available power value of the energy storage system, so that subsequent adjustments can be made according to the available power value.

[0105] Step 703 , according to the available power value of the energy storage system, the maximum chargeable and dischargeable power of each PCS is proportionally distributed to obtain the active power and reactive power of each PCS.

[0106] For example, the power value of each PCS can be calculated by the following formula:

[0107]

[0108] In the above formula, P i is the allocated power value of the i-th energy storage converter; P i,max is the maximum charge (discharge) power value of energy storage converter i; N pcs is the number of energy storage converters; P AGC is the active power target value.

[0109] Please refer to Figure 8 , which shows a logic block diagram of an embodiment of the present application involving an equal proportion distribution strategy and the SOC balanced distribution strategy for adjustment. Figure 8 As shown, when the allocation starts, the conditions for forced exit of SOC allocation are first obtained, such as the limit of the number of cycle calculations. When the number of cycles reaches the limit, SOC allocation is forced to exit. The post-balancing controller sets the balancing target St and the power allocation tolerance Ptmin. The balancing target St is also the SOC difference threshold.

[0110] The energy storage coordinator then calculates the maximum SOC difference Sm=SOCmax-SOCmin, and calculates the distribution coefficient Se according to the ratio Sm / St of the maximum SOC difference and the balance target, so as to adjust according to the target power Pt (one of the active power and the reactive power) through the proportional distribution strategy and the SOC balanced distribution strategy respectively.

[0111] Specifically, in the i-th capacity allocation process, the power allowed to be allocated is (1-Se)*Pt; at this time, for N PCSs, their total maximum chargeable and dischargeable power Ps can be calculated; then according to the maximum dischargeable power Ps1 to Psi of each PCS, (1-Se)*Pt is allocated to each PCS; when the allocation is completed, it is calculated whether the remaining capacity is greater than the threshold. If it is greater, the above process is repeated. If it is less, it means that the traversal is completed.

[0112] Correspondingly, in the i-th allocation process according to SOC, the power allowed to be allocated is Se*Pt. At this time, the energy storage coordinator can calculate the total SOC value of N PCSs and the SOC value of each PCS, thereby calculating the allocation coefficient of each PCS to allocate the allowed power to each PCS according to the proportion of SOC; when the i-th allocation is completed, calculate whether the remaining capacity at this time is greater than the threshold. If it is greater, repeat the above process. If it is less, it means that the traversal is completed.

[0113] To summarize, in the embodiments of the present application, the coordination controller is respectively connected to each grid connection point in the energy storage system, and the coordination controller is respectively connected to each PCS in the energy storage system in communication, so the coordination controller can obtain the data of each grid connection point, so as to determine whether the energy storage system needs coordination. When the energy storage system needs coordination, the total active power and total reactive power of the energy storage system can be calculated according to the data of the grid connection point, and then the energy storage data of each PCS can be obtained; finally, the coordination controller can adjust the active power and reactive power of each PCS according to the power allocation control strategy in the energy storage system and the total active power and total reactive power in the current energy storage system. In the above scheme, since the coordination controller can directly obtain each grid connection point in the energy storage system, it can directly determine the time point and degree of coordination, and in the coordination process, the coordination controller can directly obtain the energy storage data of each PCS through the communication connection, so the energy storage coordination through the coordination controller can improve the speed and accuracy of power grid regulation.

[0114] In the embodiments of the present application, a storage coordination control device is also provided, which is used to implement the above embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0115] The present application provides an energy storage coordination control device, Fig. 9 : is a schematic diagram of the structure of an energy storage coordination control device provided in an embodiment of the present application, the device comprising:

[0116] A grid connection point monitoring module 901 is used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point;

[0117] The energy storage acquisition module 902 is used to acquire the energy storage data of each PCS; the energy storage data at least includes the state of charge, working state, maximum chargeable power and maximum dischargeable power;

[0118] The working adjustment module 903 calculates the active power and reactive power of each PCS according to the power allocation control strategy corresponding to the energy storage system, and the total active power and total reactive power, so as to adjust the working state of each PCS.

[0119] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0120] The energy storage coordination control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0121] The embodiment of the present invention also provides a computer device having the above Fig. 9 The energy storage coordination control device shown.

[0122] See also Fig.10 , Fig.10 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Fig.10 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphic information in a graphical user interface on an external input / output device (such as a display device coupled to an interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig.10 A processor 10 is taken as an example.

[0123] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0124] The memory 20 stores instructions executable by at least one processor 10, so that the at least one processor 10 executes the method shown in the above embodiment.

[0125] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0126] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0127] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0128] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0129] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0130] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the present invention.

Claims

1. A method for coordinated energy storage control, characterized in that: The method is performed by a coordination controller; the coordination controller is respectively connected to each grid connection point in the energy storage system; the coordination controller is respectively connected to each PCS in the energy storage system for communication; The method comprises: Obtaining the total active power and total reactive power of the energy storage system according to the data of each grid connection point; Obtaining energy storage data of each PCS; the energy storage data at least includes state of charge, working state, maximum chargeable power and maximum dischargeable power; According to the power distribution control strategy corresponding to the energy storage system, as well as the total active power and the total reactive power, the active power and the reactive power of each PCS are calculated to adjust the working state of each PCS.

2. The method according to claim 1, characterized in that The power allocation control strategy includes at least one of equal proportional allocation and SOC balanced allocation; the equal proportional allocation strategy is used to control the working state of each PCS according to the maximum chargeable and dischargeable power of the PCS; the SOC balanced allocation strategy is used to control the working state of each PCS according to the SOC difference between the PCSs.

3. The method according to claim 2, characterized in that The active power and reactive power of each PCS are calculated according to the power allocation control strategy corresponding to the energy storage system, and the total active power and the total reactive power, including: Obtaining a balancing target; the balancing target is used to indicate a SOC difference threshold between any two PCSs; Calculating the maximum SOC difference between the PCSs; If the maximum SOC difference is greater than the SOC difference threshold, the total active power is processed according to the SOC balanced distribution strategy to obtain the active power of each PCS; If the maximum SOC difference is less than the SOC difference threshold, a power allocation coefficient is determined according to a ratio of the maximum SOC difference to the SOC difference threshold; the power allocation coefficient is used to indicate the power adjusted by the equal proportion allocation strategy and the SOC balanced allocation strategy respectively; According to the power distribution coefficient, the total active power and the total reactive power are processed by the equal proportion distribution strategy and the SOC balanced distribution strategy respectively to obtain the active power and reactive power of each PCS.

4. The method according to claim 3, characterized in that: When the power allocation control strategy is equal proportion allocation, the active power and reactive power of each PCS are calculated according to the power allocation control strategy corresponding to the energy storage system, and the total active power and the total reactive power, including: Acquire the maximum chargeable and dischargeable power of the energy storage system according to the maximum chargeable and dischargeable power of each PCS and the communication status of each PCS; Determine the available power value of the energy storage system according to the minimum value between the PCS maximum dischargeable power value of the energy storage system and the active power target value of the energy storage system; According to the available power value of the energy storage system, the maximum chargeable and dischargeable power of each PCS is proportionally distributed to obtain the active power and reactive power of each PCS.

5. The method according to claim 3, characterized in that: According to the SOC balanced distribution strategy and the total active power, the active power of each PCS is calculated, including: Obtaining a total SOC value of each PCS; Determining a capacity allocation coefficient of each PCS according to the SOC value of each PCS and the total SOC value of each PCS; The active power of each PCS is calculated according to the capacity allocation coefficient of each PCS, the total active power and the total reactive power.

6. An energy storage system, characterized in that: The energy storage system includes a coordination controller and various PCSs; the coordination controller is respectively connected to the various PCSs in communication; the coordination controller is respectively connected to various grid connection points in the energy storage system; The coordination controller is used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point; obtain the energy storage data of each PCS; the energy storage data at least includes the charge state, working state, maximum chargeable power and maximum dischargeable power; according to the power allocation control strategy corresponding to the energy storage system, as well as the total active power and total reactive power, calculate the active power and reactive power of each PCS to adjust the working state of each PCS.

7. An energy storage coordination control device, characterized in that: The device is arranged in a coordination controller; the coordination controller is respectively connected to each grid connection point in the energy storage system; the coordination controller is respectively connected to each PCS in the energy storage system for communication; The device comprises: A grid connection point monitoring module, used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point; An energy storage acquisition module, used to acquire energy storage data of each PCS; the energy storage data at least includes charge state, working state, maximum chargeable power and maximum dischargeable power; The working adjustment module calculates the active power and reactive power of each PCS according to the power distribution control strategy corresponding to the energy storage system, and the total active power and the total reactive power, so as to adjust the working state of each PCS.

8. A coordination controller, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, and computer instructions are stored in the memory; The processor includes a first processor, a second processor and a third processor; the first processor is used to process the collected signal and transmit it to the second processor; The second processor is used to obtain the total active power and total reactive power of the energy storage system according to the data of each grid connection point; The third processor is used to obtain energy storage data of each PCS; the energy storage data includes at least one of a state of charge and a working state; The third processor is further used to calculate the active power and reactive power of each PCS according to the power allocation control strategy corresponding to the energy storage system, and the total active power and total reactive power, so as to adjust the working state of each PCS.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute any one of the energy storage coordination control methods in claims 1 to 5.

10. A computer program product, characterized in that It includes computer instructions, and the computer instructions are used to enable a computer to execute the energy storage coordinated control method according to any one of claims 1 to 5.

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