A distributed energy storage promotes new energy consumption operation control method and system of area

Abstract

The application provides a distributed energy storage promotion substation new energy consumption operation control method and system, comprising: collecting power distribution substation operation data and distributed energy storage operation data; calculating the reverse load rate of the power distribution substation according to the power distribution substation operation data combined with a reverse load rate calculation formula; based on the size relationship between the reverse load rate of the power distribution substation and the set threshold, combined with the charging and discharging state of the energy storage, determining the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage; by determining the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage, the distributed energy storage is controlled and remotely operated on site, source-grid-load-storage interaction is realized, power fluctuation caused by renewable energy grid connection is suppressed, photovoltaic reverse transmission is prevented, the power utilization rate of distributed photovoltaic is improved, and the consumption level of renewable energy in the power distribution network is effectively improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric power, and particularly relates to a distributed energy storage operation control method and system for improving new energy consumption in a distribution area. BACKGROUND

[0002] With the vigorous promotion of distributed photovoltaic pilot work, distributed photovoltaic development in large pieces, cluster grid connection and disorderly access with high proportion of random intermittent output and short-term large fluctuation will change the pattern of traditional unidirectional power flow of the distribution network in the area. A large number of distributed photovoltaic high-density, near-disorderly access, resulting in insufficient regulation capacity of the power system, and the flexibility of the regulation resource is becoming increasingly tight, which may lead to surplus power returning at all levels of power grid, causing unorderly flow of power flow and increasing network loss, seriously affecting the safe operation of the power grid. The contradiction between new energy consumption and system stability is increasingly prominent, and the demand for local consumption of distributed power is urgent. The traditional method cannot solve the problem of power flow return caused by high proportion of distributed photovoltaic grid connection and local consumption of distributed photovoltaic at high cost performance. SUMMARY

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the application provides a distributed energy storage operation control method for improving new energy consumption in a distribution area, comprising:

[0004] Collecting distribution area operation data and distributed energy storage operation data;

[0005] According to the distribution area operation data, the reverse load rate of the distribution area is calculated by combining the reverse load rate calculation formula;

[0006] Based on the size relationship between the reverse load rate of the distribution area and the set threshold, combined with the charging and discharging state of the energy storage, the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage are determined;

[0007] The distributed energy storage of the distribution area is controlled based on the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage;

[0008] The distribution area operation data at least includes one or more of the following: voltage, current, apparent power, power factor, distribution transformer reverse active power and distribution transformer reverse reactive power, and the distributed energy storage operation data at least includes one or more of the following: energy storage state of charge, energy storage charging and discharging state and energy storage charging and discharging power;

[0009] The charging and discharging state of the energy storage includes: charging state, discharging state and standby state.

[0010] Preferably, the determination of the charging active power and the charging reactive power or the discharging active power and the discharging reactive power of the distributed energy storage based on the size relationship between the reverse load rate of the power distribution area and the set threshold value in combination with the state of charge of the energy storage comprises:

[0011] Initializing the counter;

[0012] Calculating the first charging and discharging active power and the first charging and discharging reactive power of the energy storage at the current time based on the reverse load rate, the set first threshold value of the reverse load rate, the apparent power and the power factor in combination with the calculation formula of the first charging and discharging active power and the first charging and discharging reactive power of the energy storage;

[0013] Calculating the second charging and discharging active power and the second charging and discharging reactive power of the energy storage at the current time based on the reverse load rate, the apparent power and the power factor in combination with the calculation formula of the second charging and discharging active power and the second charging and discharging reactive power of the energy storage;

[0014] Calculating the discharging power of the energy storage at the current time based on the reverse load rate, the set first threshold value of the reverse load rate, the apparent power and the power factor in combination with the calculation formula of the discharging power of the energy storage;

[0015] When the reverse load rate is greater than or equal to the first threshold value and the energy storage is in the charging state, determining the charging active power and the charging reactive power of the energy storage based on the state of charge of the energy storage, the first charging and discharging active power and the first charging and discharging reactive power of the energy storage;

[0016] When the reverse load rate is greater than or equal to the first threshold value and the energy storage is in the discharging state, determining the discharging active power and the discharging reactive power of the energy storage based on the discharging power of the energy storage and the state of charge of the energy storage;

[0017] When the reverse load rate is greater than or equal to the first threshold value and the energy storage is in the standby state, determining the charging active power and the charging reactive power of the energy storage based on the state of charge of the energy storage, the first charging and discharging active power and the first charging and discharging reactive power of the energy storage;

[0018] When the reverse load rate is less than the first threshold value and greater than the second threshold value and the energy storage is in the charging state, determining the charging active power and the charging reactive power of the energy storage based on the state of charge of the energy storage, the second charging and discharging active power and the second charging and discharging reactive power of the energy storage;

[0019] When the reverse load rate is less than the first threshold value and greater than the second threshold value and the energy storage is in the discharging state, determining the discharging active power and the discharging reactive power of the energy storage based on the state of charge of the energy storage, the short-circuit current or the voltage deviation check condition;

[0020] When the reverse load rate is less than the first threshold value and greater than the second threshold value and the energy storage is in the standby state, determining the charging active power and the charging reactive power of the energy storage based on the state of charge of the energy storage;

[0021] When the reverse load rate is less than or equal to the second threshold value and there is no photovoltaic reverse sending phenomenon, the operation control of the local consumption of the distributed photovoltaic new energy in the transformer area ends.

[0022] The first threshold value of the reverse load rate is greater than the second threshold value of the reverse load rate.

[0023] Preferably, the calculation formula of the first charge-discharge active power of the energy storage is as follows:

[0024]

[0025] In the formula, A is the first charge-discharge active power of the energy storage, M is the first threshold value of the reverse load rate, λ is the reverse load rate, S is the apparent power, and cosφ is the power factor. 反 r

[0026] Preferably, the calculation formula of the first charge-discharge reactive power of the energy storage is as follows:

[0027]

[0028] In the formula, a is the first charge-discharge reactive power of the energy storage, M is the first threshold value of the reverse load rate, λ is the reverse load rate, S is the apparent power, and a / S is the ratio of the reactive power to the apparent power. 反 r

[0029] Preferably, the calculation formula of the second charge-discharge active power of the energy storage is as follows:

[0030]

[0031] In the formula, B is the second charge-discharge active power of the energy storage, λ is the reverse load rate, S is the apparent power, and cosφ is the power factor. 反 r

[0032] Preferably, the calculation formula of the second charge-discharge reactive power of the energy storage is as follows:

[0033]

[0034] In the formula, b is the second charge-discharge reactive power of the energy storage, λ is the reverse load rate, S is the apparent power, and a / S is the ratio of the reactive power to the apparent power. 反 r

[0035] Preferably, the calculation formula of the discharge power of the energy storage is as follows:

[0036] C = (1-M) * S​​​​​​​​​​​​r *k r

[0037] wherein C is the energy storage discharging power, M is the first threshold value of the reverse load rate, S r is the apparent power, k r is the equipment operation margin coefficient.

[0038] Preferably, when the reverse load rate is greater than or equal to the first threshold value and the energy storage is in the charging state, the charging active power and the charging reactive power of the energy storage are determined based on the state of charge of the energy storage, the first charging and discharging active power of the energy storage and the first charging and discharging reactive power of the energy storage, comprising:

[0039] determining whether the state of charge of the energy storage is greater than or equal to the upper limit of the state of charge of the energy storage;

[0040] if yes, the charging active power and the charging reactive power of the energy storage are 0, otherwise, determining whether the first charging and discharging active power of the energy storage and the first charging and discharging reactive power of the energy storage are less than or equal to the corresponding rated maximum charging active power of the energy storage and the rated maximum charging reactive power of the energy storage;

[0041] if yes, the charging active power and the charging reactive power of the energy storage are the corresponding rated maximum charging active power and the rated maximum charging reactive power of the energy storage, otherwise, the corresponding first charging and discharging active power and the first charging and discharging reactive power are taken.

[0042] Preferably, when the reverse load rate is greater than or equal to the first threshold value and the energy storage is in the discharging state, the discharging active power and the discharging reactive power of the energy storage are determined based on the energy storage discharging power and the state of charge of the energy storage, comprising:

[0043] determining whether the current energy storage discharging power is less than a set dead zone value;

[0044] if yes, a counter for recording the duration is incremented by 1, otherwise, determining whether the counter is greater than a set state duration;

[0045] if yes, the discharging active power and the discharging reactive power of the energy storage are 0, otherwise, determining whether the current state of charge of the energy storage is less than or equal to the lower limit of the state of charge of the energy storage;

[0046] if yes, the discharging active power and the discharging reactive power of the energy storage are 0, otherwise, the energy storage reduces the discharging active power and the discharging reactive power, and the value of the reduced discharging active power and the discharging reactive power is the value of the first charging and discharging active power of the energy storage and the first charging and discharging reactive power of the energy storage.

[0047] Preferably, when the reverse load rate is greater than or equal to the first threshold value and the energy storage is in the standby state, the charging active power and the charging reactive power of the energy storage are determined based on the energy storage state of charge, the energy storage first charge-discharge active power and the energy storage first charge-discharge reactive power, comprising:

[0048] determining whether the current energy storage state of charge is greater than or equal to the upper limit of the energy storage state of charge;

[0049] If yes, the charging active power and the charging reactive power of the energy storage are 0, otherwise, it is determined whether the energy storage first charge-discharge active power and the energy storage first charge-discharge reactive power are less than or equal to the corresponding energy storage rated maximum charging active power and the energy storage rated maximum charging reactive power;

[0050] If yes, the charging active power and the charging reactive power of the energy storage take the corresponding rated maximum charging active power and the rated maximum charging reactive power, otherwise, the corresponding energy storage first charge-discharge active power and the first charge-discharge reactive power are taken.

[0051] Preferably, when the reverse load rate is less than the first threshold value and greater than the second threshold value and the energy storage is in the charging state, the charging active power and the charging reactive power of the energy storage are determined based on the energy storage state of charge, the energy storage second charge-discharge active power and the energy storage second charge-discharge reactive power, comprising:

[0052] determining whether the current distributed energy storage state of charge is greater than or equal to the upper limit of the energy storage state of charge;

[0053] If yes, the charging active power and the charging reactive power of the energy storage are 0, otherwise, it is determined whether the energy storage second charge-discharge active power and the energy storage second charge-discharge reactive power are less than or equal to the corresponding energy storage rated maximum charging active power and the energy storage rated maximum charging reactive power;

[0054] If yes, the charging active power and the charging reactive power of the energy storage take the corresponding rated maximum charging active power and the rated maximum charging reactive power, otherwise, the corresponding energy storage second charge-discharge active power and the second charge-discharge reactive power are taken.

[0055] Preferably, when the reverse load rate is less than the first threshold value and greater than the second threshold value and the energy storage is in the discharging state, the discharging active power and the discharging reactive power of the energy storage are determined based on the energy storage state of charge, the short-circuit current or the voltage deviation check, comprising:

[0056] determining whether the current distributed energy storage state of charge is less than or equal to the lower limit of the distributed energy storage state of charge;

[0057] If yes, the discharging active power and the discharging reactive power of the energy storage are 0, otherwise, it is determined whether the current short-circuit current or voltage deviation check is passed;

[0058] If yes, the discharging power is the product of the set reverse load rate and the apparent power, otherwise, the discharging active power and the discharging reactive power of the energy storage are 0.

[0059] Preferably, when the reverse load rate is less than the first threshold value and greater than the second threshold value and the energy storage is in the standby state, the charging active power and the charging reactive power of the energy storage are determined based on the state of charge of the energy storage, including:

[0060] determining whether the current state of charge of the distributed energy storage is greater than or equal to the upper limit of the state of charge of the distributed energy storage;

[0061] If yes, the charging active power and the charging reactive power of the energy storage are 0, otherwise, the charging active power and the charging reactive power of the energy storage are the corresponding second charging and discharging active power and the second charging and discharging reactive power of the energy storage.

[0062] Based on the same inventive concept, the application also provides a distributed energy storage operation control system for improving new energy consumption in a power distribution area, characterized in that it comprises:

[0063] an intelligent fusion terminal and a power distribution cloud platform;

[0064] The intelligent fusion terminal comprises a data acquisition module and an operation control module.

[0065] The data acquisition module is configured to acquire power distribution area operation data and distributed energy storage operation data.

[0066] The operation control module is configured to process the acquired power distribution area operation data and distributed energy storage operation data, determine the charging active power and the charging reactive power or the discharging active power and the discharging reactive power of the distributed energy storage, and control the distributed energy storage in the power distribution area based on the charging active power and the charging reactive power or the discharging active power and the discharging reactive power of the distributed energy storage.

[0067] The power distribution cloud platform is configured to implement distributed energy storage parameter distribution, information statistics, summary operation and maintenance management, and remote control in multiple power distribution areas.

[0068] Compared with the closest prior art, the application has the following beneficial effects:

[0069] The application provides a distributed energy storage improved new energy consumption operation control method and system for a power distribution area, comprising: collecting power distribution area operation data and distributed energy storage operation data; calculating a reverse load rate of the power distribution area according to the power distribution area operation data in combination with a reverse load rate calculation formula; determining charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage based on the size relationship between the reverse load rate of the power distribution area and a set threshold value in combination with the charging and discharging state of the energy storage; and controlling the distributed energy storage of the power distribution area based on the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage; wherein the power distribution area operation data at least includes one or more of the following: voltage, current, apparent power, power factor, reverse active power of a distribution transformer and reverse reactive power of the distribution transformer, and the distributed energy storage operation data at least includes one or more of the following: energy storage state of charge, charging and discharging state of the energy storage and charging and discharging power of the energy storage; wherein the charging and discharging state of the energy storage includes: charging state, discharging state and standby state; the application determines the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage by a distributed energy storage improved distributed generation consumption operation control method, controls and remotely operates the distributed energy storage on site, coordinates the communication and control between the equipment layer and the power distribution cloud platform, realizes source-grid-load-storage interaction, suppresses power fluctuation caused by renewable energy grid connection, prevents photovoltaic reverse feeding, improves the power utilization rate of distributed photovoltaic, and effectively improves the consumption level of renewable energy in the power distribution network. BRIEF DESCRIPTION OF DRAWINGS

[0070] Figure 1 A distributed energy storage improved new energy consumption operation control method flowchart is provided for the application;

[0071] Figure 2 A distributed energy storage operation control general flowchart for improving distributed generation consumption is provided for the application;

[0072] Figure 3 A control method flowchart for the case that the reverse load rate is greater than or equal to the first reverse load rate threshold value and the energy storage is in the charging state;

[0073] Figure 4 A control method flowchart for the case that the reverse load rate is greater than or equal to the first reverse load rate threshold value and the energy storage is in the discharging state;

[0074] Figure 5 A control method flowchart for the case that the reverse load rate is greater than or equal to the first reverse load rate threshold value and the energy storage is in the standby state;

[0075] Figure 6 A control method flowchart for the case that the reverse load rate is greater than the second reverse load rate threshold value and less than the first reverse load rate threshold value and the energy storage is in the charging state;

[0076] Figure 7 The control method flow chart for the reverse load rate greater than the reverse load rate second threshold value and less than the reverse load rate first threshold value and the energy storage in the discharge state;

[0077] Figure 8 The control method flow chart for the reverse load rate greater than the reverse load rate second threshold value and less than the reverse load rate first threshold value and the energy storage in the standby state;

[0078] Figure 9 The control architecture schematic diagram of the intelligent fusion terminal and the power distribution cloud platform;

[0079] Figure 10 The distributed energy storage improves the new energy consumption operation control system structure schematic diagram of the district provided by the application. DETAILED DESCRIPTION

[0080] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings.

[0081] Example 1:

[0082] The distributed energy storage improves the new energy consumption operation control method flow chart provided by the application as shown in Figure 1 , including:

[0083] Step 1: Collecting power distribution district operation data and distributed energy storage operation data;

[0084] Step 2: According to the power distribution district operation data, the reverse load rate is calculated by combining the reverse load rate calculation formula;

[0085] Step 3: Based on the size relationship between the power distribution district reverse load rate and the set threshold value, combined with the energy storage charging and discharging state, the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage are determined;

[0086] Based on the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage, the district distributed energy storage is controlled;

[0087] Among them, the power distribution district operation data at least includes one or more of the following: voltage, current, apparent power, power factor, distribution transformer reverse active power and distribution transformer reverse reactive power, and the distributed energy storage operation data at least includes one or more of the following: energy storage state of charge, energy storage charging and discharging state and energy storage charging and discharging power;

[0088] Among them, the charging and discharging state of the energy storage includes: charging state, discharging state and standby state. Collecting power distribution district operation data and distributed energy storage operation data;

[0089] The application provides a total flow chart for operation control of a distribution area distributed energy storage for improving distributed power generation consumption, as shown in the figure. Figure 2 .

[0090] Specifically, step 1 comprises:

[0091] The voltage and current data of the power distribution area are collected through the intelligent fusion terminal exchange collection APP, and the current SOC, the current charging and discharging state and the charging and discharging power of the distributed energy storage are collected through the intelligent fusion terminal area distributed energy storage communication APP. In this embodiment, the SOC means the state of charge.

[0092] Step 2 comprises:

[0093] The current distribution transformer reverse load rate λ is calculated according to the distribution transformer reverse load rate formula 反 .

[0094] Step 3 comprises:

[0095] It is judged whether the reverse load rate of the power distribution area is greater than 80%, and in this embodiment, the first threshold value of the reverse load rate is equal to 80%. If yes, the next step is executed; otherwise, the twelfth step is executed.

[0096] Fourth step: according to the current distributed energy storage charging and discharging state, different charging and discharging operation control strategies are selected. If the current distributed energy storage is in the charging state, the fifth step is executed, and the control flow of the fifth step is as shown in the figure Figure 3 If the current distributed energy storage is in the discharging state, the seventh step is executed, and the control flow of the seventh step is as shown in the figure Figure 4 If the current distributed energy storage is in the standby state, the tenth step is executed, and the control flow of the tenth step is as shown in the figure Figure 5 .

[0097] Fifth step: it is judged whether the current SOC is greater than or equal to the upper limit of the SOC. If yes, it indicates that the energy storage cannot be charged, the energy storage charging active and reactive power is 0, and the standby state is entered, and the counter is set to 0. Otherwise, the next step is executed.

[0098] Sixth step: it is judged whether the active power and the reactive power are less than or equal to the rated maximum charging active and reactive power of the energy storage. If yes, the charging power is the rated maximum charging active and reactive power of the energy storage. Otherwise, the charging power is the active power and the reactive power , and the counter is set to 0.

[0099] Seventh step: it is judged whether the current discharging power is less than the dead zone value P dz . If yes, the counter is added by 1, and the next step is executed. Otherwise, the ninth step is executed.

[0100] Step 8: Determine whether the counter is greater than the state duration T. If yes, the energy storage discharges active and reactive power to 0 and enters the standby state, otherwise, set the counter to 0;

[0101] Step 9: Determine whether the current SOC is less than or equal to the SOC lower limit. If yes, the energy storage cannot discharge, the energy storage discharges active and reactive power to 0, enters the standby state, and sets the counter to 0. Otherwise, the energy storage reduces the discharging active power reactive power Set the counter to 0.

[0102] Step 10: Determine whether the current SOC is greater than or equal to the SOC upper limit. If yes, the energy storage cannot charge, the energy storage maintains the standby state, otherwise, execute the next step;

[0103] Step 11: Determine whether the active power reactive power is less than or equal to the maximum rated charging active and reactive power of the energy storage. If yes, the charging power is the maximum rated charging active and reactive power of the energy storage, otherwise, the charging power is the active power reactive power

[0104] Step 12: Determine whether the reverse load rate of the power distribution area is less than or equal to 0%. If yes, execute the next step, otherwise, execute the nineteenth step.

[0105] Step 13: According to the current charging and discharging state of the distributed energy storage, select different charging and discharging operation control strategies. If the current distributed energy storage is in the charging state, execute the fourteenth step, the fourteenth step control flow is as shown in Figure 6 , if the current distributed energy storage is in the discharging state, execute the sixteenth step, the sixteenth step control flow is as shown in Figure 7 , if the current distributed energy storage is in the standby state, execute the eighteenth step, the eighteenth step control flow is as shown in Figure 8 ;

[0106] Step 14: Determine whether the current SOC is greater than or equal to the SOC upper limit. If yes, the energy storage cannot charge, the energy storage charging active and reactive power is 0, enters the standby state, sets the counter to 0, otherwise, execute the next step;

[0107] Step 15: Determine whether the active power reactive power is less than or equal to the maximum rated charging active and reactive power of the energy storage. If yes, the charging power is the maximum rated charging active and reactive power of the energy storage, otherwise, the charging power is the active power reactive power Set the counter to 0.

[0108] Sixteenth step: judge whether the current SOC is less than or equal to the SOC lower limit, if yes, it means that the energy storage cannot discharge, the energy storage active and reactive power is 0, and the standby state is entered, the counter is set to 0, otherwise, the next step is executed.

[0109] Seventeenth step: judge whether the current short-circuit current or voltage deviation check is passed, if yes, the discharge power is 20%*S r *k r , otherwise, the energy storage active and reactive power is 0, and the standby state is entered. The counter is set to 0.

[0110] Eighteenth step: judge whether the current SOC is greater than or equal to the SOC upper limit, if yes, it means that the energy storage cannot charge, the energy storage maintains the standby state, otherwise, the energy storage enters the charging state, the charging active power is , and the reactive power

[0111] Nineteenth step: there is no photovoltaic reverse sending problem, and the distributed photovoltaic new energy local consumption operation control of the transformer area is ended.

[0112] Embodiment 2:

[0113] Based on the same inventive concept, the application provides a distributed energy storage for improving the operation control system of new energy consumption of a transformer area, a structural schematic diagram of which is shown in Figure 10 , and the system comprises:

[0114] An intelligent fusion terminal and a power distribution cloud platform, and a control architecture schematic diagram of the intelligent fusion terminal and the power distribution cloud platform is shown in Figure 9 ;

[0115] The intelligent fusion terminal comprises a data acquisition module and an operation control module.

[0116] The data acquisition module is used to acquire power distribution transformer area operation data and distributed energy storage operation data.

[0117] The operation control module is used to process the acquired power distribution transformer area operation data and distributed energy storage operation data, determine the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage, and control the transformer area distributed energy storage based on the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage.

[0118] The power distribution cloud platform is used to coordinate the communication and control between the equipment layer and the power distribution cloud platform, realize the parameter issuing, information statistics, summary operation and maintenance management and remote control of multiple transformer area distributed energy storages.

[0119] Those skilled in the art will appreciate that embodiments of the application can be devised for a method, a system, or a computer program product. Accordingly, the present application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0120] The present application is described in reference to the flowchart and / or block diagrams of the method, apparatus (system) and computer program product according to embodiments of the application. It will be understood that each block of the flowchart and / or block diagrams, and combinations of blocks in the flowchart and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processing system or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 means for carrying out each of the one or more functions specified in the flowchart and / or block diagram block or blocks.

[0121] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 means for carrying out each of the one or more functions specified in the flowchart and / or block diagram block or blocks.

[0122] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the flowchart and / or block diagram block or blocks. Figure 1 one or more functions specified in the flowchart and / or block diagram block or blocks. Figure 1 means for carrying out each of the one or more functions specified in the flowchart and / or block diagram block or blocks.

[0123] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, but not to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that: after reading the present application, those skilled in the art can make various changes, modifications or equivalent replacements to the specific embodiments of the application, but these changes, modifications or equivalent replacements are all within the scope of protection of the claims of the present application.

Claims

1. A method for operation and control of distributed energy storage to enhance the absorption of new energy in a distribution area, characterized in that, include: Collect operational data from distribution transformer substations and distributed energy storage systems; The reverse load rate of the distribution station area is calculated based on the operating data of the distribution station area and the reverse load rate calculation formula. Based on the relationship between the reverse load rate of the distribution area and the set threshold, and combined with the energy storage charging and discharging status, the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage are determined. The distributed energy storage in the distribution area is controlled based on the charging active power and charging reactive power or the discharging active power and discharging reactive power of the distributed energy storage. The distribution transformer area operation data includes at least one or more of the following: voltage, current, apparent power, power factor, reverse active power of the distribution transformer and reverse reactive power of the distribution transformer; the distributed energy storage operation data includes at least one or more of the following: energy storage state of charge, energy storage state of charge and discharge and energy storage power of charge and discharge. The energy storage states include: charging state, discharging state, and standby state.

2. The method as described in claim 1, characterized in that, The determination of the charging active power and charging reactive power or discharging active power and discharging reactive power of distributed energy storage based on the relationship between the reverse load rate of the distribution area and a set threshold, combined with the energy storage charging and discharging status, includes: Initialize the counter; Based on the reverse load rate, the set first threshold of the reverse load rate, the apparent power and the power factor, the active power and reactive power of the first charge and discharge of the energy storage are calculated at the current moment by combining the calculation formulas of the first charge and discharge active power and the first charge and discharge reactive power of the energy storage. The formula for calculating the active power and reactive power of the second charge and discharge of energy storage at the current moment is based on the reverse load rate, apparent power and power factor combined with the active power and reactive power of the second charge and discharge of energy storage. The energy storage discharge power at the current moment is calculated based on the reverse load rate, the set first threshold of the reverse load rate, the apparent power and the power factor combined with the energy storage discharge power. When the reverse load rate is greater than or equal to the first threshold and the energy storage is in a charging state, the charging active power and charging reactive power of the energy storage are determined based on the energy storage state of charge, the first charging and discharging active power of the energy storage, and the first charging and discharging reactive power of the energy storage. When the reverse load rate is greater than or equal to the first threshold and the energy storage is in a discharging state, the active power and reactive power of the energy storage discharge are determined based on the energy storage discharge power and the energy storage state of charge. When the reverse load rate is greater than or equal to the first threshold and the energy storage is in standby state, the charging active power and charging reactive power of the energy storage are determined based on the energy storage state of charge, the first charging and discharging active power of the energy storage, and the first charging and discharging reactive power of the energy storage. When the reverse load rate is less than the first threshold and greater than the second threshold and the energy storage is in a charging state, the charging active power and charging reactive power of the energy storage are determined based on the energy storage state of charge, the second charging and discharging active power of the energy storage, and the second charging and discharging reactive power of the energy storage. When the reverse load rate is less than the first threshold and greater than the second threshold and the energy storage is in a discharging state, the active power and reactive power of the energy storage are determined based on the energy storage state of charge, short-circuit current or voltage deviation verification. When the reverse load rate is less than the first threshold and greater than the second threshold and the energy storage is in standby state, the charging active power and charging reactive power of the energy storage are determined based on the energy storage state of charge. When the reverse load rate is less than or equal to the second threshold and there is no photovoltaic reverse backfeed phenomenon, the local consumption operation control of distributed photovoltaic new energy in the transformer area ends. Wherein, the first threshold of reverse load rate is greater than the second threshold of reverse load rate.

3. The method as described in claim 2, characterized in that, The formula for calculating the active power of the first charge and discharge of the energy storage is as follows: A=(λ) 反 -M)*S r * In the formula, A is the active power of the first charge and discharge of energy storage, M is the first threshold of reverse load rate, and λ 反 For reverse load rate, S r Apparent power, The power factor.

4. The method as described in claim 2, characterized in that, The formula for calculating the reactive power of the first charge and discharge of the energy storage is as follows: a=(λ) 反 -M)*S r * In the formula, a is the reactive power of the first charge and discharge of energy storage, M is the first threshold of reverse load rate, and λ 反 For reverse load rate, S r Apparent power, It is the ratio of reactive power to apparent power.

5. The method as described in claim 2, characterized in that, The formula for calculating the second charge / discharge active power of the energy storage is as follows: B=λ 反 *S r * In the formula, B is the second charge / discharge active power of energy storage, and λ 反 For reverse load rate, S r Apparent power, The power factor.

6. The method as described in claim 2, characterized in that, The formula for calculating the reactive power of the second charge and discharge of the energy storage is as follows: b=λ 反 *S r * In the formula, b is the reactive power of the second charge and discharge of energy storage, and λ 反 For reverse load rate, S r Apparent power, It is the ratio of reactive power to apparent power.

7. The method as described in claim 2, characterized in that, The formula for calculating the energy storage discharge power is as follows: C=(1-M)*S r *k r In the formula, C is the energy storage discharge power, M is the first threshold of reverse load rate, and S r For apparent power, k r It is the equipment operating margin coefficient.

8. The method as described in claim 2, characterized in that, When the reverse load rate is greater than or equal to the first threshold and the energy storage is in a charging state, the charging active power and charging reactive power of the energy storage are determined based on the energy storage state of charge, the first charging and discharging active power of the energy storage, and the first charging and discharging reactive power of the energy storage, including: Determine whether the energy storage state of charge is greater than or equal to the upper limit of the energy storage state of charge. If so, the active power and reactive power of the energy storage charging are 0; otherwise, determine whether the active power and reactive power of the first charge and discharge of the energy storage are less than or equal to the corresponding maximum rated active power and maximum rated reactive power of the energy storage. If so, the charging active power and charging reactive power of the energy storage are taken as the corresponding rated maximum charging active power and rated maximum charging reactive power of the energy storage; otherwise, the corresponding first charging and discharging active power and first charging and discharging reactive power are taken.

9. The method as described in claim 2, characterized in that, When the reverse load rate is greater than or equal to the first threshold and the energy storage is in a discharging state, determining the active power and reactive power of the energy storage discharge based on the energy storage discharge power and the energy storage state of charge includes: Determine whether the current energy storage discharge power is less than the set dead zone value; If yes, the counter used to record the duration is incremented by 1; otherwise, it is determined whether the counter is greater than the set state duration. If so, the active power and reactive power of the energy storage discharge are 0; otherwise, determine whether the current energy storage state of charge is less than or equal to the energy storage state of charge limit. If so, the active power and reactive power of the energy storage discharge are 0; otherwise, the active power and reactive power of the energy storage discharge are reduced, and the value of the reduced active power and reactive power of the energy storage discharge are the values ​​of the first charge and discharge active power and the first charge and discharge reactive power of the energy storage.

10. The method as described in claim 2, characterized in that, When the reverse load rate is greater than or equal to the first threshold and the energy storage is in standby mode, the determination of the charging active power and charging reactive power of the energy storage based on the energy storage state of charge, the first charging and discharging active power of the energy storage, and the first charging and discharging reactive power of the energy storage includes: Determine whether the current state of charge of the energy storage is greater than or equal to the upper limit of the state of charge of the energy storage; If so, the active power and reactive power of the energy storage charging are 0; otherwise, determine whether the active power and reactive power of the first charge and discharge of the energy storage are less than or equal to the corresponding maximum rated active power and maximum rated reactive power of the energy storage. If so, the charging active power and charging reactive power of the energy storage are taken as the corresponding rated maximum charging active power and rated maximum charging reactive power; otherwise, the corresponding first charging and discharging active power and first charging and discharging reactive power of the energy storage are taken.

11. The method as described in claim 2, characterized in that, When the reverse load rate is less than a first threshold and greater than a second threshold, and the energy storage is in a charging state, determining the charging active power and charging reactive power of the energy storage based on the energy storage state of charge, the second charging and discharging active power of the energy storage, and the second charging and discharging reactive power of the energy storage includes: Determine whether the current state of charge of distributed energy storage is greater than or equal to the upper limit of the state of charge of energy storage; If so, the active power and reactive power of the energy storage charging are 0; otherwise, determine whether the second active power and reactive power of the energy storage charging and discharging are less than or equal to the corresponding maximum rated active power and maximum rated reactive power of the energy storage. If so, the charging active power and charging reactive power of the energy storage are taken as the corresponding rated maximum charging active power and rated maximum charging reactive power; otherwise, the corresponding energy storage second charging and discharging active power and second charging and discharging reactive power are taken.

12. The method as described in claim 2, characterized in that, When the reverse load rate is less than a first threshold and greater than a second threshold and the energy storage is in a discharging state, the active power and reactive power of the energy storage discharge are determined based on the energy storage state of charge, short-circuit current, or voltage deviation verification, including: Determine whether the current state of charge of distributed energy storage is less than or equal to the minimum state of charge of distributed energy storage. If so, the active power and reactive power of the energy storage discharge are 0; otherwise, determine whether the current short-circuit current or voltage deviation check has passed. If so, the discharge power is the product of the set reverse load rate, apparent power, and equipment operating margin coefficient; otherwise, the active and reactive power of the energy storage discharge are 0.

13. The method as described in claim 2, characterized in that, When the reverse load rate is less than a first threshold and greater than a second threshold, and the energy storage is in standby mode, determining the charging active power and charging reactive power of the energy storage based on the energy storage state of charge includes: Determine whether the current state of charge of distributed energy storage is greater than or equal to the upper limit of the state of charge of distributed energy storage; If so, the active power and reactive power of the energy storage charging are 0; otherwise, the active power and reactive power of the energy storage charging are taken as the corresponding second active power and second reactive power of the energy storage charging and discharging.

14. A distributed energy storage-enhanced renewable energy consumption operation and control system for a distribution area, used in accordance with the method described in claim 1, characterized in that, The system includes: Intelligent converged terminals and power distribution cloud platforms; The intelligent fusion terminal includes: a data acquisition module and an operation control module; The data acquisition module is used to collect operating data of the distribution substation and distributed energy storage. The operation control module is used to process the collected distribution substation operation data and distributed energy storage operation data, determine the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage, and control the distributed energy storage in the substation based on the charging active power and charging reactive power or discharging active power and discharging reactive power of the distributed energy storage. The power distribution cloud platform is used to coordinate communication and control between the equipment layer and the power distribution cloud platform, and to realize the distribution of distributed energy storage parameters, information statistics, summary operation and maintenance management and remote control for multiple distribution areas.

Images