Photovoltaic energy storage cooperative regulation and control method and system, computer equipment and storage medium

Abstract

The invention discloses a photovoltaic energy storage cooperative regulation and control method and system, computer equipment and a storage medium. The method comprises the steps that the load rate of a distribution network transformer is monitored in real time; the load rate is compared with a set load rate out-of-limit threshold value; calculating an out-of-limit quantity according to the rated capacity of the distribution network transformer and a set load rate out-of-limit threshold value; for the distribution network transformer exceeding the upper limit, eliminating the out-of-limit quantity by increasing the generated power of photovoltaic equipment; only when all the photovoltaic devices connected with the distribution network transformer exceeding the upper limit are in a full-power state but still cannot eliminate the out-of-limit quantity, the energy storage device is used for discharging, and the residual out-of-limit quantity is eliminated through the discharge power of the energy storage device; and for the distribution network transformer exceeding the lower limit, charging the energy storage equipment and absorbing the out-of-limit quantity, and only when all the energy storage equipment connected with the distribution network transformer exceeding the lower limit is in the maximum charging state but still cannot absorb the out-of-limit quantity, reducing the power generation power of the photovoltaic equipment and absorbing the out-of-limit quantity.

Description

Technical Field

[0001] This invention belongs to the field of power, specifically a photovoltaic energy storage coordinated control method, system, computer equipment, and storage medium. Background Technology

[0002] Figure 1 This diagram shows a simplified distribution network line for connecting distributed photovoltaic and energy storage systems, with the switch at... Figure 1 Not shown in the diagram, AC represents AC power supply, TR1 represents distribution transformer, PV1-PV N Represents N distributed photovoltaic devices, LD1-LD M Indicates M loads, ES1-ES T This represents T energy storage devices. In traditional distribution networks, the AC grid directly supplies power to the load via distribution transformers. However, with the integration of photovoltaic (PV) equipment, PV power generation can also supply power to the load. If the PV power generation exceeds the load, the excess electricity can be stored in the energy storage devices. At night, after the PV equipment stops generating power, the energy storage devices discharge to supply power to the load. The load rate of the distribution transformer TR1 is monitored periodically to determine whether PV power generation and energy storage charging / discharging power need adjustment. When the distribution transformer's load rate is high, the PV power generation needs to be increased to share some of the load, thereby reducing the distribution transformer's load rate. If the PV equipment is already operating at full capacity, the energy storage can be discharged to alleviate the load pressure on the distribution transformer. Conversely, when the distribution transformer's load rate is low or even experiencing power backflow, the energy storage can be charged to absorb some of the PV power generation. If the energy storage cannot absorb the excess PV power, the PV power generation needs to be reduced to keep the distribution transformer's load rate within a normal range. Since each distribution transformer may be connected to multiple distributed photovoltaic and energy storage devices, when regulating photovoltaic and energy storage, deciding which devices to regulate and how much to regulate each device often relies on human experience.

[0003] When there are few devices, the active power of photovoltaics and the charging and discharging power of energy storage can be adjusted manually based on the operation of the distribution transformer. However, when there are many distribution transformers, and each distribution transformer is connected to multiple photovoltaic and energy storage devices, it is sometimes difficult to make the optimal adjustment based on manual experience.

[0004] Therefore, the current methods for solving the problem of distribution network transformers exceeding their limits have the following main drawbacks:

[0005] (1) The biggest drawback of the existing scheme is that it requires manual determination of the adjustment amount of each photovoltaic and energy storage device. When the number of photovoltaic and energy storage devices under the distribution transformer is relatively small, manual experience can give a relatively reasonable control scheme. When the number of photovoltaic and energy storage devices is relatively large, it is difficult for manual experience to give the optimal scheme. Moreover, manual calculation may take too long and it is difficult to meet the real-time requirements.

[0006] (2) Another significant drawback is that one person can only handle the photovoltaic energy storage regulation under a few distribution transformers at the same time. When there are a lot of distribution transformers to deal with, a lot of human resources need to be invested.

[0007] In summary, current solutions are insufficient to provide optimal solutions, often relying on human experience to offer rather crude control measures. This prevents photovoltaic and energy storage devices from reaching their full potential and hinders the maximization of resource utilization. Summary of the Invention

[0008] Purpose of the invention: To solve the problem of distribution network transformers exceeding limits, this invention proposes a method, system, computer equipment, and storage medium for automatically generating distributed photovoltaic and energy storage coordinated control schemes. Through photovoltaic and energy storage coordinated control, the power demand of distribution transformers is met with minimal photovoltaic and energy storage regulation, reducing command interaction with photovoltaic and energy storage devices and solving the problem of distribution network transformers exceeding limits.

[0009] Technical solution: A method for coordinated regulation of photovoltaic energy storage, comprising the following steps:

[0010] Assuming that the distribution network transformer is connected to multiple distributed photovoltaic devices and energy storage devices, the load rate of the distribution network transformer is monitored in real time;

[0011] The load rate of the monitored distribution network transformers is compared with the set load rate over-limit threshold to filter out distribution network transformers that exceed the upper limit and those that exceed the lower limit.

[0012] The over-limit amount is calculated based on the rated capacity of the distribution network transformer and the set over-limit threshold for load rate.

[0013] For distribution network transformers that exceed the upper limit, the excess capacity is eliminated by increasing the power generation of photovoltaic equipment; only when all photovoltaic equipment connected to the distribution network transformer that exceeds the upper limit is at full power, but the excess capacity still cannot be eliminated, energy storage equipment is used to discharge, and the remaining excess capacity is eliminated by the discharge power of the energy storage equipment.

[0014] For distribution transformers that exceed the lower limit, the excess capacity can be absorbed by charging the energy storage devices. Only when all energy storage devices connected to the distribution transformer that exceeds the lower limit are in maximum charging state, but still cannot absorb the excess capacity, will the power generation of the photovoltaic equipment be reduced to eliminate the remaining excess capacity.

[0015] Furthermore, the over-limit amount calculated based on the rated capacity of the distribution network transformer and the set over-limit threshold is expressed as follows:

[0016]

[0017] In the formula, E k Indicates the over-limit quantity of distribution network transformers, LR k T represents the load factor of the distribution network transformer. u T is the upper limit of the load rate exceeding the threshold. l C is the lower limit of the load factor exceeding the threshold. k This indicates the rated capacity of the distribution network transformer.

[0018] Furthermore, for distribution network transformers exceeding the upper limit, the excess capacity is eliminated by increasing the power generation capacity of photovoltaic equipment. Specific operations include:

[0019] Assuming that the distribution transformer exceeding the upper limit is connected to N photovoltaic devices, sort the remaining adjustable power of the photovoltaic devices in descending order;

[0020] Prioritize selecting photovoltaic (PV) equipment with large remaining adjustable power to determine the PV equipment set participating in eliminating the over-limit requirement. control =(PV1,…,PV) x ,…,PV H ), where PV H Let H be the photovoltaic device in the set of photovoltaic devices participating in the elimination of over-limit photovoltaic devices. The remaining adjustable power of the photovoltaic devices participating in the elimination of over-limit photovoltaic devices satisfies the following condition:

[0021] PC1+…+PC x +…+PC H ≥E k ≥PC1+…+PC x +…+PC H-1

[0022] In the formula, PC H E represents the remaining adjustable power of the H-th photovoltaic device in the set of photovoltaic devices participating in the elimination of the excess capacity. k This indicates that the distribution network transformer has exceeded its limit;

[0023] The set of adjustable power for each photovoltaic device is obtained as follows:

[0024] PC control =(PC1,…,PC x ,…,PC H -(E k -PC1-…-PC x -…-PC H-1 )).

[0025] Furthermore, the provision that energy storage devices are only used to discharge when all photovoltaic devices connected to the distribution network transformer exceeding the limit are at full power, but the excess capacity still cannot be eliminated, and the remaining excess capacity is eliminated through the discharge power of the energy storage devices, specifically includes:

[0026] If E k >PC1+…+PC x +…+PC N The power deficit is then expressed as PG = E k -(PC1+…+PC n +…+PC N );

[0027] The energy storage devices are sorted from highest to lowest discharge power to determine the set of energy storage devices (ES) participating in the discharge. control =(ES1,…,ES) p ,…,ES P The discharge power of the energy storage device participating in the discharge must meet the following conditions:

[0028] PS1+...+PS p +…+PS P ≥PG≥PS1+…+PS p +…+PS P-1

[0029] The set of regulating power of the energy storage devices participating in the discharge is obtained as follows:

[0030] ESP control =(PS1,…,PS p PS P -(PG-PS1-…-PS p -…-PS P-1 )).

[0031] In the formula, PS P This represents the discharge power of the Pth energy storage device in the set of energy storage devices that are discharging.

[0032] Furthermore, for distribution network transformers exceeding the lower limit, the excess capacity is absorbed by charging energy storage devices. Specific operations include:

[0033] Assuming that the distribution network transformer below the lower limit is connected to T energy storage devices, sort the energy storage devices by their charging power from largest to smallest, and determine the set of energy storage devices participating in charging as ES. control =(ES1,…,ES) p ,…,ES P ), where ES PFor the P-th energy storage device in the set of energy storage devices participating in charging, the charging power of the energy storage devices participating in charging satisfies the following condition:

[0034] ESC1+…+ESC p +…+ESC P ≥|E k |≥ESC1+…+ESC p +…+ESC P-1

[0035] In the formula, ESC P E represents the charging power of the P-th energy storage device in the set of energy storage devices participating in charging. k This indicates that the quantity exceeds the limit;

[0036] The set of regulating power of the energy storage devices participating in charging is as follows:

[0037] ESP control =(ESC1,…,ESC) p ,…,ESC P -(|E k |-ESC1-…-ESC p -…-ESC P-1 )).

[0038] Furthermore, the photovoltaic power generation capacity will be reduced only when all energy storage devices connected to the distribution network transformer exceeding the lower limit are at maximum charging status, but still cannot absorb the excess capacity. Specific operations include:

[0039] When|E k |>ESC1+…+ESC t +…+ESC T The excess quantity that cannot be consumed is PO = |E k |-(ESC1+…+ESC t +…+ESC T );

[0040] Assuming that the distribution network transformer with a lower limit is connected to N photovoltaic devices, sort the current power generation of the photovoltaic devices from largest to smallest;

[0041] Prioritize downgrading photovoltaic (PV) equipment with high current power generation capacity; the set of PV equipment to be included in the downgrading will be PV. control =(PV1,…,PV) x ,…,PV H The photovoltaic equipment whose power generation capacity is subject to reduction must meet the following conditions:

[0042] P1+…+P x +…+P H ≥PO≥P1+…+Px +…+P H-1

[0043] In the formula, P H This represents the current power generation of the Hth photovoltaic device in the set of photovoltaic devices participating in the power reduction adjustment;

[0044] The set of regulated power for each photovoltaic device in the set of photovoltaic devices participating in the power reduction is as follows:

[0045] PC control =(-P1,…,-P x ,…,(PO-P1-…-P x -…-P H-1 )-P H ).

[0046] This invention also discloses a photovoltaic energy storage coordinated control system, comprising:

[0047] The distribution network transformer load rate monitoring module is used to monitor the load rate of distribution network transformers in real time.

[0048] The distribution transformer screening module is used to compare the load rate of the monitored distribution transformers with the set load rate over-limit threshold, and screen out distribution transformers that exceed the upper limit and distribution transformers that exceed the lower limit.

[0049] The over-limit calculation module is used to calculate the over-limit amount based on the rated capacity of the distribution network transformer and the set over-limit threshold for the load rate.

[0050] The control module is used to eliminate the over-limit load by increasing the power generation of photovoltaic equipment for distribution network transformers that exceed the upper limit; only when all photovoltaic equipment connected to the distribution network transformer exceeding the upper limit is at full power but still cannot eliminate the over-limit load, the energy storage equipment is used to discharge and eliminate the remaining over-limit load through the discharge power of the energy storage equipment; and for distribution network transformers exceeding the lower limit load, the over-limit load is absorbed by charging the energy storage equipment; only when all energy storage equipment connected to the distribution network transformer exceeding the lower limit is at maximum charging but still cannot absorb the over-limit load, the power generation of photovoltaic equipment is reduced to eliminate the remaining over-limit load.

[0051] Furthermore, the over-limit amount calculated based on the rated capacity of the distribution network transformer and the set over-limit threshold is expressed as follows:

[0052]

[0053] In the formula, E k Indicates the over-limit quantity of distribution network transformers, LR k T represents the load factor of the distribution network transformer. u T is the upper limit of the load rate exceeding the threshold. lC is the lower limit of the load factor exceeding the threshold. k This indicates the rated capacity of the distribution network transformer.

[0054] Furthermore, for distribution network transformers exceeding the upper limit, the excess capacity is eliminated by increasing the power generation capacity of photovoltaic equipment. Specific operations include:

[0055] Assuming that the distribution transformer exceeding the upper limit is connected to N photovoltaic devices, sort the remaining adjustable power of the photovoltaic devices in descending order;

[0056] Prioritize selecting photovoltaic (PV) equipment with large remaining adjustable power to determine the PV equipment set participating in eliminating the over-limit requirement. control =(PV1,…,PV) x ,…,PV H ), where PV H Let H be the photovoltaic device in the set of photovoltaic devices participating in the elimination of over-limit photovoltaic devices. The remaining adjustable power of the photovoltaic devices participating in the elimination of over-limit photovoltaic devices satisfies the following condition:

[0057] PC1+…+PC x +…+PC H ≥E k ≥PC1+…+PC x +…+PC H-1

[0058] In the formula, PC H E represents the remaining adjustable power of the H-th photovoltaic device in the set of photovoltaic devices participating in the elimination of the excess capacity. k This indicates that the distribution network transformer has exceeded its limit;

[0059] The set of adjustable power for each photovoltaic device is obtained as follows:

[0060] PC control =(PC1,…,PC x ,…,PC H -(E k -PC1-…-PC x -…-PC H-1 )).

[0061] Furthermore, the provision that energy storage devices are only used to discharge when all photovoltaic devices connected to the distribution network transformer exceeding the limit are at full power, but the excess capacity still cannot be eliminated, and the remaining excess capacity is eliminated through the discharge power of the energy storage devices, specifically includes:

[0062] If E k >PC1+…+PC x +…+PC N The power deficit is then expressed as PG = E k-(PC1+…+PC n +…+PC N );

[0063] The energy storage devices are sorted from highest to lowest discharge power to determine the set of energy storage devices (ES) participating in the discharge. control =(ES1,…,ES) p ,…,ES P The discharge power of the energy storage device participating in the discharge must meet the following conditions:

[0064] PS1+...+PS p +…+PS P ≥PG≥PS1+…+PS p +…+PS P-1

[0065] The set of regulating power of the energy storage devices participating in the discharge is obtained as follows:

[0066] ESP control =(PS1,…,PS p PS P -(PG-PS1-…-PS p -…-PS P-1 )).

[0067] In the formula, PS P This represents the discharge power of the Pth energy storage device in the set of energy storage devices that are discharging.

[0068] Furthermore, for distribution network transformers exceeding the lower limit, the excess capacity is absorbed by charging energy storage devices. Specific operations include:

[0069] Assuming that the distribution network transformer below the lower limit is connected to T energy storage devices, sort the energy storage devices by their charging power from largest to smallest, and determine the set of energy storage devices participating in charging as ES. control =(ES1,…,ES) p ,…,ES P ), where ES P For the P-th energy storage device in the set of energy storage devices participating in charging, the charging power of the energy storage devices participating in charging satisfies the following condition:

[0070] ESC1+…+ESC p +…+ESC P ≥|E k |≥ESC1+…+ESC p +…+ESC P-1

[0071] In the formula, ESC PE represents the charging power of the P-th energy storage device in the set of energy storage devices participating in charging. k This indicates that the quantity exceeds the limit;

[0072] The set of regulating power of the energy storage devices participating in charging is as follows:

[0073] ESP control =(ESC1,…,ESC) p ,…,ESC P -(|E k |-ESC1-…-ESC p -…-ESC P-1 )).

[0074] Furthermore, the photovoltaic power generation capacity will be reduced only when all energy storage devices connected to the distribution network transformer exceeding the lower limit are at maximum charging status, but still cannot absorb the excess capacity. Specific operations include:

[0075] When|E k |>ESC1+…+ESC t +…+ESC T The excess quantity that cannot be consumed is PO = |E k |-(ESC1+…+ESC t +…+ESC T );

[0076] Assuming that the distribution network transformer with a lower limit is connected to N photovoltaic devices, sort the current power generation of the photovoltaic devices from largest to smallest;

[0077] Prioritize downgrading photovoltaic (PV) equipment with high current power generation capacity; the set of PV equipment to be included in the downgrading will be PV. control =(PV1,…,PV) x ,…,PV H The photovoltaic equipment whose power generation capacity is subject to reduction must meet the following conditions:

[0078] P1+…+P x +…+P H ≥PO≥P1+…+P x +…+P H-1

[0079] In the formula, P H This represents the current power generation of the Hth photovoltaic device in the set of photovoltaic devices participating in the power reduction adjustment;

[0080] The set of regulated power for each photovoltaic device in the set of photovoltaic devices participating in the power reduction is as follows:

[0081] PC control =(-P1,…,-P x,…,(PO-P1-…-P x -…-P H-1 )-P H ).

[0082] The present invention also discloses a photovoltaic energy storage system, comprising: a photovoltaic energy storage coordinated control system and a distribution network transformer, wherein the distribution network transformer is connected to multiple distributed photovoltaic devices and energy storage devices; the photovoltaic energy storage coordinated control system is used to control the photovoltaic devices and energy storage devices.

[0083] The present invention also discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of a photovoltaic energy storage coordinated control method.

[0084] The present invention also discloses a storage medium storing a photovoltaic energy storage coordinated control program, wherein the photovoltaic energy storage coordinated control program, when executed by at least one processor, implements the steps of a photovoltaic energy storage coordinated control method.

[0085] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0086] (1) This invention sets an over-limit threshold for the load rate of distribution network transformers to screen out distribution transformers that exceed the upper and lower limits. For distribution transformers that exceed the upper limit, the load rate is first reduced by increasing the photovoltaic power generation. If this method still cannot solve the problem of the distribution transformer exceeding the upper limit, the load rate is further reduced by turning on the energy storage discharge method. For distribution transformers that exceed the lower limit, excess photovoltaic power generation is first absorbed by energy storage charging. If this method still cannot solve the problem of the distribution transformer exceeding the lower limit, the load rate is increased by reducing the photovoltaic power generation. If the distribution network transformer operates under heavy overload or reverse heavy overload conditions for a long time, it will seriously affect the stable operation of the power system and cause a series of power quality problems. Therefore, the method of this invention can significantly reduce the occurrence of heavy overload in the distribution area through the coordinated regulation of photovoltaic and energy storage, thereby improving power quality and ensuring the safe and reliable operation of the power grid.

[0087] (2) The photovoltaic energy storage coordinated control scheme of the present invention is automatically generated through program analysis, which can solve the problem of massive distribution transformers exceeding the limit. Compared with the traditional manual control method based on experience, it not only improves efficiency, but also gives a strategy that comprehensively considers the photovoltaic and energy storage conditions, maximizes the utilization of photovoltaic power generation and energy storage efficiency, and improves resource utilization. Attached Figure Description

[0088] Figure 1 Distribution network route diagram for easy access to distributed photovoltaic and energy storage;

[0089] Figure 2 This is a flowchart of the system execution process;

[0090] Figure 3 Flowchart for regulating photovoltaic energy storage beyond its upper limit;

[0091] Figure 4 Flowchart for adjusting photovoltaic energy storage to exceed the lower limit. Detailed Implementation

[0092] To make the objectives, technical solutions, and advantages of the present invention clearer, the following description, in conjunction with the accompanying drawings and embodiments, will further illustrate a photovoltaic energy storage coordinated control method, system, computer equipment, and storage medium of the present invention.

[0093] Example 1:

[0094] This embodiment proposes a photovoltaic (PV) energy storage coordinated control method, which mainly includes: setting a load factor over-limit threshold for distribution network transformers; filtering distribution network transformers that exceed the upper and lower limits through a program; for transformers exceeding the upper limit, it indicates that the current load is relatively high, and the first consideration is to increase the power generation of PV to share part of the load and reduce the load factor of the transformer. Based on the rated capacity of the transformer and the upper limit threshold, the specific power value exceeding the limit can be calculated, and the power value exceeding the limit can be eliminated by increasing the PV power generation. If all PVs are at full capacity and the over-limit problem still cannot be eliminated, then the energy storage needs to be discharged to continue to share part of the load and further reduce the load factor of the transformer. For transformers exceeding the lower limit, it indicates that the current PV power generation is relatively large, and the excess PV power generation is first absorbed by charging the energy storage. If all energy storage is at maximum charging and still cannot absorb the excess PV power generation, then the PV power generation needs to be reduced. The control commands for PV and energy storage are automatically generated by the program, and the adjustment amount for each PV and energy storage is also accurately calculated by the program, which greatly improves the speed and accuracy of strategy generation.

[0095] Now combined Figure 2 Further explanation is provided regarding the regulation process for photovoltaic energy storage exceeding the upper limit and the regulation process for photovoltaic energy storage exceeding the lower limit.

[0096] Assuming there are K distribution transformers in the system, it can be represented as a set TR = (TR1, ..., TR2). k ,…,TR K Each distribution network transformer has a structure like this. Figure 1 As shown, the set of rated capacities of distribution network transformers is C = (C1, ..., C...). k ,…,C K The load factor set of the distribution network transformer is LR = (LR1, ..., LR2). k ,…,LR KThe photovoltaic energy storage system is only required to regulate the load factor when the load factor of the distribution network transformer is greater than the upper threshold or less than the lower threshold. The upper threshold for the load factor is set to T. u The lower limit is T l For distribution network transformers TR k Its limit E k It can be calculated using the following formula.

[0097]

[0098] For distribution network transformer TR k If LR k >T u This indicates that the transformer load factor exceeds the upper limit of the threshold, and it is necessary to increase the photovoltaic power generation to reduce the transformer load factor. For example... Figure 3 As shown, assuming N photovoltaic devices are connected to this distribution transformer, for each photovoltaic device (PV) n The current active power of the photovoltaic equipment is represented by P. n The installed capacity of photovoltaic equipment is expressed as R. n The remaining adjustable power of a photovoltaic device is represented by PC. n =R n -P n The remaining adjustable power of the photovoltaic (PV) equipment is ranked from largest to smallest, and PV equipment with the largest remaining adjustable power is used for power generation first. The ranked PV set is represented as PV = (PV1, ..., PV2). n ,…,PV N The set of remaining available photovoltaic capacity is represented as PC = (PC1, ..., PC2). n ,…,PC N ), satisfying the condition PC1≥…≥PC n ≥…≥PC N The collection of photovoltaic (PV) devices that need to participate in photovoltaic active power regulation is called PV. control =(PV1,…,PV) x ,…,PV H ), satisfying the condition: PC1 + ... + PC x +…+PC H ≥E k ≥PC1+…+PC x +…+PC H-1 The adjustable power set of each photovoltaic device is PC. control =(PC1,…,PC x ,…,PC H -(E k -PC1-…-PC x -…-PC H-1 )).

[0099] If E k >PC1+…+PC x +…+PC N This indicates that even with all photovoltaic devices operating at full capacity, the problem of distribution network transformers exceeding their limits still cannot be resolved; the power deficit is expressed as PG = E. k -(PC1+…+PC n +…+PC N At this point, energy storage is needed for discharge. The energy storage is sorted from largest to smallest discharge power, and the sorted energy storage set is represented as ES = (ES1, ..., ES2). t ,…,ES T The corresponding set of energy storage and discharge power is PS = (PS1, ..., PS). t PS T The energy storage set that needs to participate in the discharge is ES. control =(ES1,…,ES) p ,…,ES P ), satisfying the condition PS1+…+PS p +…+PS P ≥PG≥PS1+…+PS p +…+PS P-1 The discharge power of each energy storage unit is ESP. control =(PS1,…,PS p PS P -(PG-PS1-…-PS p -…-PS P-1 )).

[0100] If for distribution network transformer TR k LR k <T l This indicates that the load rate of the distribution network transformer is less than the lower threshold, suggesting that the photovoltaic power generation is relatively large. Therefore, it is necessary to first charge the energy storage equipment to absorb the excess photovoltaic power. For example... Figure 4 As shown, assuming that T energy storage devices are connected to the distribution network transformer, the charging power of the energy storage devices is sorted from largest to smallest, resulting in the corresponding set of energy storage charging power as ESC = (ESC1, ..., ESC). t ,…,ESC T The energy storage set that needs to participate in charging is ES. control =(ES1,…,ES) p ,…,ES P The condition is met: ESC1 + ... + ESC p +…+ESC P ≥|E k |≥ESC1+…+ESC p +…+ESC P-1The charging power of each energy storage unit is ESP. control =(ESC1,…,ESC) p ,…,ESC P -(|E k |-ESC1-…-ESC p -…-ESC P-1 )).

[0101] If all energy storage devices are charged at maximum power and still cannot absorb the excess photovoltaic power generation, i.e., |E k |>ESC1+…+ESC t +…+ESC T The unabsorbable photovoltaic power is PO = |E k |-(ESC1+…+ESC t +…+ESC T In this case, it is necessary to reduce the photovoltaic power generation capacity. Assuming that N photovoltaic devices are connected to the distribution network transformer, for each photovoltaic device (PV...) n The current active power of photovoltaic power is represented by P. n The active power of photovoltaic (PV) units is sorted from largest to smallest, and the PV units with the largest power output are reduced first. The sorted PV set is represented as PV = (PV1, ..., PV2). n ,…,PV N The corresponding current active power set of photovoltaic power is represented as P = (P1, ..., P2). n ,…,P N ), satisfying the condition P1≥…≥P n ≥…≥P N The photovoltaic (PV) arrays that need to participate in photovoltaic active power regulation are called PV arrays. control =(PV1,…,PV) x ,…,PV H ), satisfying the condition P1+…+P x +…+P H ≥PO≥P1+…+P x +…+P H-1 The set of regulation capacities for each photovoltaic unit is PC. control =(-P1,…,-P x ,…,(PO-P1-…-P x -…-P H-1 )-P H ).

[0102] The calculations obtain the set of photovoltaic and energy storage devices that need to be regulated, as well as the power that each photovoltaic and energy storage device needs to adjust. Then, the calculated adjustment amount is sent to the corresponding photovoltaic and energy storage devices through instructions to realize the regulation of photovoltaic output and energy storage charging and discharging, thereby affecting the change of distribution transformer load rate.

[0103] The instruction format issued to photovoltaic and energy storage devices is as follows:

[0104]

[0105] The above command format only lists some of the more important parameters. `id` represents the command sequence number; since commands can be sent in batches, `id` is used to distinguish multiple commands sent in the same batch. `appID` represents the application ID. `body` contains the main content of the command, `paras` contains the parameter values, and `val` is the value to be adjusted. `PV` represents PC. control Energy storage for ESP control `serviceId` represents the service ID, `command` indicates that this is an executable command, and `deviceId` represents the device ID, which is a unique identifier for the photovoltaic or energy storage system that needs to be adjusted. `cmd` indicates the command type, and `SE_LimVal` indicates that this is a command to adjust the output power.

[0106] After the photovoltaic or energy storage device completes the execution of the received command, it will return the execution result and update the command status based on the returned result. If the command execution is successful, the control ends. If the command execution fails, the specific reason for the failure can be analyzed based on the returned failure information, and the command can be reissued after the problem is resolved. The format of the command return is shown below.

[0107]

[0108] Example 2:

[0109] Based on Example 1, this example proposes a photovoltaic energy storage coordinated control system, including:

[0110] The distribution network transformer load rate monitoring module is used to monitor the load rate of distribution network transformers in real time.

[0111] The distribution transformer screening module is used to compare the load rate of the monitored distribution transformers with the set load rate over-limit threshold, and screen out distribution transformers that exceed the upper limit and distribution transformers that exceed the lower limit.

[0112] The over-limit calculation module is used to calculate the over-limit amount based on the rated capacity of the distribution network transformer and the set over-limit threshold for the load rate.

[0113] The control module is used to eliminate the over-limit load by increasing the power generation of photovoltaic equipment for distribution network transformers that exceed the upper limit; only when all photovoltaic equipment connected to the distribution network transformer exceeding the upper limit is at full power but still cannot eliminate the over-limit load, the energy storage equipment is used to discharge and eliminate the remaining over-limit load through the discharge power of the energy storage equipment; and for distribution network transformers exceeding the lower limit load, the over-limit load is absorbed by charging the energy storage equipment; only when all energy storage equipment connected to the distribution network transformer exceeding the lower limit is at maximum charging but still cannot absorb the over-limit load, the power generation of photovoltaic equipment is reduced to eliminate the remaining over-limit load.

[0114] Example 3:

[0115] Based on Example 2, this example proposes a photovoltaic energy storage system, including: a photovoltaic energy storage coordinated control system and a distribution network transformer, each of which is connected to multiple distributed photovoltaic devices and energy storage devices; the photovoltaic energy storage coordinated control system is used to regulate the photovoltaic devices and energy storage devices to eliminate excess capacity.

[0116] Example 4:

[0117] This embodiment discloses a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps disclosed in any of the above embodiments.

[0118] Example 5:

[0119] This embodiment discloses a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps disclosed in any of the above embodiments.

[0120] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, or optical storage, etc. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0121] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0122] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for coordinated regulation of photovoltaic energy storage, characterized in that: Includes the following steps: Assuming that the distribution network transformer is connected to multiple distributed photovoltaic devices and energy storage devices, the load rate of the distribution network transformer is monitored in real time; The load rate of the monitored distribution network transformers is compared with the set load rate over-limit threshold to filter out distribution network transformers that exceed the upper limit and those that exceed the lower limit. The over-limit amount is calculated based on the rated capacity of the distribution network transformer and the set over-limit threshold for load rate. For distribution network transformers that exceed the upper limit, the excess capacity is eliminated by increasing the power generation of photovoltaic equipment; only when all photovoltaic equipment connected to the distribution network transformer that exceeds the upper limit is at full power, but the excess capacity still cannot be eliminated, energy storage equipment is used to discharge, and the remaining excess capacity is eliminated by the discharge power of the energy storage equipment. For distribution transformers that exceed the lower limit, the excess capacity can be absorbed by charging the energy storage devices. Only when all energy storage devices connected to the distribution transformer that exceeds the lower limit are in maximum charging state, but still cannot absorb the excess capacity, will the power generation of the photovoltaic equipment be reduced to eliminate the remaining excess capacity.

2. The photovoltaic energy storage coordinated regulation method according to claim 1, characterized in that: The over-limit amount calculated based on the rated capacity of the distribution network transformer and the set over-limit threshold for load rate is expressed as follows: In the formula, E k Indicates the over-limit quantity of distribution network transformers, LR k T represents the load factor of the distribution network transformer. u T is the upper limit of the load rate exceeding the threshold. l C is the lower limit of the load factor exceeding the threshold. k This indicates the rated capacity of the distribution network transformer.

3. The photovoltaic energy storage coordinated regulation method according to claim 1, characterized in that: For distribution network transformers exceeding the upper limit, the over-limit can be eliminated by increasing the power generation capacity of photovoltaic equipment. Specific operations include: Assuming that the distribution transformer exceeding the upper limit is connected to N photovoltaic devices, sort the remaining adjustable power of the photovoltaic devices in descending order; Prioritize selecting photovoltaic (PV) equipment with large remaining adjustable power to determine the PV equipment set participating in eliminating the over-limit requirement. control =(PV1,…,PV) x ,…,PV H ), where PV H Let H be the photovoltaic device in the set of photovoltaic devices participating in the elimination of over-limit photovoltaic devices. The remaining adjustable power of the photovoltaic devices participating in the elimination of over-limit photovoltaic devices satisfies the following condition: PC1+…+PC x +…+PC H ≥E k ≥PC1+…+PC x +…+PC H-1 In the formula, PC H E represents the remaining adjustable power of the H-th photovoltaic device in the set of photovoltaic devices participating in the elimination of the excess capacity. k This indicates that the distribution network transformer has exceeded its limit; The set of adjustable power for each photovoltaic device is obtained as follows: PC control =(PC1,…,PC x ,…,PC H -(E k -PC1-…-PC x -…-PC H-1 ))。 4. The photovoltaic energy storage coordinated regulation method according to claim 3, characterized in that: The aforementioned method involves using energy storage devices to discharge when all photovoltaic devices connected to the distribution network transformer exceeding the limit are operating at full capacity, but the excess capacity still cannot be eliminated. The discharge power of the energy storage devices is used to eliminate the remaining excess capacity. Specific operations include: If E k >PC1+…+PC x +…+PC N The power deficit is then expressed as PG = E k -(PC1+…+PC n +…+PC N ); The energy storage devices are sorted from highest to lowest discharge power to determine the set of energy storage devices (ES) participating in the discharge. control =(ES1,…,ES) p ,…,ES P The discharge power of the energy storage device participating in the discharge must meet the following conditions: PS1+…+PS p +…+PS P ≥PG≥PS1+…+PS p +…+PS P-1 The set of regulating power of the energy storage devices participating in the discharge is obtained as follows: ESP control =(PS1,…,PS p ,…,PS P -(PG-PS1-…-PS p -…-PS P-1 ))。 In the formula, PS P This represents the discharge power of the Pth energy storage device in the set of energy storage devices that are discharging.

5. The photovoltaic energy storage coordinated regulation method according to claim 1, characterized in that: For distribution network transformers exceeding the lower limit, the excess capacity is absorbed by charging energy storage devices. Specific operations include: Assuming that the distribution network transformer below the lower limit is connected to T energy storage devices, sort the energy storage devices by their charging power from largest to smallest, and determine the set of energy storage devices participating in charging as ES. control =(ES1,…,ES) p ,…,ES P ), where ES P For the P-th energy storage device in the set of energy storage devices participating in charging, the charging power of the energy storage devices participating in charging satisfies the following condition: ESC1+…+ESC p +…+ESC P ≥|E k |≥ESC1+…+ESC p +…+ESC P-1 In the formula, ESC P E represents the charging power of the P-th energy storage device in the set of energy storage devices participating in charging. k This indicates that the quantity exceeds the limit; The set of regulating power of the energy storage devices participating in charging is as follows: ESP control =(ESC1,…,ESC p ,…,ESC P -(|E k |-ESC1-…-ESC p -…-ESC P-1 ))。 6. The photovoltaic energy storage coordinated regulation method according to claim 5, characterized in that: The aforementioned reduction in photovoltaic power generation occurs only when all energy storage devices connected to the distribution network transformer exceeding the lower limit are at maximum charging capacity, but still cannot absorb the excess capacity. Specific operations include: When|E k |>ESC1+…+ESC t +…+ESC T The excess quantity that cannot be consumed is PO = |E k |-(ESC1+…+ESC t +…+ESC T ); Assuming that the distribution network transformer with a lower limit is connected to N photovoltaic devices, sort the current power generation of the photovoltaic devices from largest to smallest; Prioritize downgrading photovoltaic (PV) equipment with high current power generation capacity; the set of PV equipment to be included in the downgrading will be PV. control =(PV1,…,PV) x ,…,PV H The photovoltaic equipment whose power generation capacity is subject to reduction must meet the following conditions: P1+…+P x +…+P H ≥PO≥P1+…+P x +…+P H-1 In the formula, P H This represents the current power generation of the Hth photovoltaic device in the set of photovoltaic devices participating in the power reduction adjustment; The set of regulated power for each photovoltaic device in the set of photovoltaic devices participating in the power reduction is as follows: PC control =(-P1,…,-P x ,…,(PO-P1-…-P x -…-P H-1 )-P H )。 7. A photovoltaic energy storage coordinated control system, characterized in that: include: The distribution network transformer load rate monitoring module is used to monitor the load rate of distribution network transformers in real time. The distribution transformer screening module is used to compare the load rate of the monitored distribution transformers with the set load rate over-limit threshold, and screen out distribution transformers that exceed the upper limit and distribution transformers that exceed the lower limit. The over-limit calculation module is used to calculate the over-limit amount based on the rated capacity of the distribution network transformer and the set over-limit threshold for the load rate. The control module is used to eliminate the over-limit load by increasing the power generation of photovoltaic equipment for distribution network transformers that exceed the upper limit; only when all photovoltaic equipment connected to the distribution network transformer exceeding the upper limit is at full power but still cannot eliminate the over-limit load, the energy storage equipment is used to discharge and eliminate the remaining over-limit load through the discharge power of the energy storage equipment; and for distribution network transformers exceeding the lower limit load, the over-limit load is absorbed by charging the energy storage equipment; only when all energy storage equipment connected to the distribution network transformer exceeding the lower limit is at maximum charging but still cannot absorb the over-limit load, the power generation of photovoltaic equipment is reduced to eliminate the remaining over-limit load.

8. A photovoltaic energy storage coordinated control system according to claim 7, characterized in that: The over-limit amount calculated based on the rated capacity of the distribution network transformer and the set over-limit threshold for load rate is expressed as follows: In the formula, E k Indicates the over-limit quantity of distribution network transformers, LR k T represents the load factor of the distribution network transformer. u T is the upper limit of the load rate exceeding the threshold. l C is the lower limit of the load factor exceeding the threshold. k This indicates the rated capacity of the distribution network transformer.

9. A photovoltaic energy storage coordinated control system according to claim 7, characterized in that: For distribution network transformers exceeding the upper limit, the over-limit can be eliminated by increasing the power generation capacity of photovoltaic equipment. Specific operations include: Assuming that the distribution transformer exceeding the upper limit is connected to N photovoltaic devices, sort the remaining adjustable power of the photovoltaic devices in descending order; Prioritize selecting photovoltaic (PV) equipment with large remaining adjustable power to determine the PV equipment set participating in eliminating the over-limit requirement. control =(PV1,…,PV) x ,…,PV H ), where PV H Let H be the photovoltaic device in the set of photovoltaic devices participating in the elimination of over-limit photovoltaic devices. The remaining adjustable power of the photovoltaic devices participating in the elimination of over-limit photovoltaic devices satisfies the following condition: PC1+…+PC x +…+PC H ≥E k ≥PC1+…+PC x +…+PC H-1 In the formula, PC H E represents the remaining adjustable power of the H-th photovoltaic device in the set of photovoltaic devices participating in the elimination of the excess capacity. k This indicates that the distribution network transformer has exceeded its limit; The set of adjustable power for each photovoltaic device is obtained as follows: PC control =(PC1,…,PC x ,…,PC H -(E k -PC1-…-PC x -…-PC H-1 ))。 10. A photovoltaic energy storage coordinated control system according to claim 9, characterized in that: The aforementioned method involves using energy storage devices to discharge when all photovoltaic devices connected to the distribution network transformer exceeding the limit are operating at full capacity, but the excess capacity still cannot be eliminated. The discharge power of the energy storage devices is used to eliminate the remaining excess capacity. Specific operations include: If E k >PC1+…+PC x +…+PC N The power deficit is then expressed as PG = E k -(PC1+…+PC n +…+PC N ); The energy storage devices are sorted from highest to lowest discharge power to determine the set of energy storage devices (ES) participating in the discharge. control =(ES1,…,ES) p ,…,ES P The discharge power of the energy storage device participating in the discharge must meet the following conditions: PS1+…+PS p +…+PS P ≥PG≥PS1+…+PS p +…+PS P-1 The set of regulating power of the energy storage devices participating in the discharge is obtained as follows: ESP control =(PS1,…,PS p ,…,PS P -(PG-PS1-…-PS p -…-PS P-1 ))。 In the formula, PS P This represents the discharge power of the Pth energy storage device in the set of energy storage devices that are discharging.

11. A photovoltaic energy storage coordinated control system according to claim 7, characterized in that: For distribution network transformers exceeding the lower limit, the excess capacity is absorbed by charging energy storage devices. Specific operations include: Assuming that the distribution network transformer below the lower limit is connected to T energy storage devices, sort the energy storage devices by their charging power from largest to smallest, and determine the set of energy storage devices participating in charging as ES. control =(ES1,…,ES) p ,…,ES P ), where ES P For the P-th energy storage device in the set of energy storage devices participating in charging, the charging power of the energy storage devices participating in charging satisfies the following condition: ESC1+…+ESC p +…+ESC P ≥|E k |≥ESC1+…+ESC p +…+ESC P-1 In the formula, ESC P E represents the charging power of the P-th energy storage device in the set of energy storage devices participating in charging. k This indicates that the quantity exceeds the limit; The set of regulating power of the energy storage devices participating in charging is as follows: ESP control =(ESC1,…,ESC p ,…,ESC P -(|E k |-ESC1-…-ESC p -…-ESC P-1 ))。 12. A photovoltaic energy storage coordinated control system according to claim 11, characterized in that: The aforementioned reduction in photovoltaic power generation occurs only when all energy storage devices connected to the distribution network transformer exceeding the lower limit are at maximum charging capacity, but still cannot absorb the excess capacity. Specific operations include: When|E k |>ESC1+…+ESC t +…+ESC T The excess quantity that cannot be consumed is PO = |E k |-(ESC1+…+ESC t +…+ESC T ); Assuming that the distribution network transformer with a lower limit is connected to N photovoltaic devices, sort the current power generation of the photovoltaic devices from largest to smallest; Prioritize downgrading photovoltaic (PV) equipment with high current power generation capacity; the set of PV equipment to be included in the downgrading will be PV. control =(PV1,…,PV) x ,…,PV H The photovoltaic equipment whose power generation capacity is subject to reduction must meet the following conditions: P1+…+P x +…+P H ≥PO≥P1+…+P x +…+P H-1 In the formula, P H This represents the current power generation of the Hth photovoltaic device in the set of photovoltaic devices participating in the power reduction adjustment; The set of regulated power for each photovoltaic device in the set of photovoltaic devices participating in the power reduction is as follows: PC control =(-P1,…,-P x ,…,(PO-P1-…-P x -…-P H-1 )-P H )。 13. A photovoltaic energy storage system, characterized in that: include: A photovoltaic energy storage coordinated control system and multiple distribution network transformers, each of which is connected to multiple distributed photovoltaic devices and energy storage devices; The photovoltaic energy storage coordinated control system is a photovoltaic energy storage coordinated control system as described in any one of claims 7 to 12, used for controlling photovoltaic equipment and energy storage equipment.

14. A computer device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the photovoltaic energy storage coordinated control method according to any one of claims 1 to 6.

15. A storage medium, characterized in that, The storage medium stores a photovoltaic energy storage collaborative control program, which, when executed by at least one processor, implements the steps of the photovoltaic energy storage collaborative control method according to any one of claims 1 to 6.

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