Island division method and device for power distribution network and storage medium

Abstract

The invention discloses an island division method and device for a power distribution network and a storage medium. The method comprises the steps that target parameter information of a load in the power distribution network is acquired, and the target parameter information is used for representing the importance degree of the load in an island of the power distribution network; on the basis of the target parameter information and a target constraint condition, carrying out island division on the power distribution network to obtain a first output power of a load in an island, the target constraint condition being used for enabling the island to be in a normal operation state; detecting an operation state of an uncontrollable power supply in the power distribution network based on the first output power; and in response to the operation state being a first operation state, an island division result of the power distribution network is determined, the first operation state is an island operation state under the condition that the uncontrollable power supply and a controllable power supply in the power distribution network are connected in parallel, and the controllable power supply is a power supply provided with an energy storage device in the power distribution network. The technical problems of low power generation utilization rate and low power supply reliability in the power distribution network are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network performance, and in particular to a method, device and storage medium for islanding a distribution network. Background Art

[0002] In recent years, the increase in installed capacity and penetration of distributed power sources has made their island operation possible. In order to realize the island power supply of distributed power sources in the distribution network, three methods can be used: heuristic algorithms, mathematical optimization algorithms, and artificial intelligence algorithms. However, the above methods take into account that when the electrical distance between the uncontrollable distributed power sources and the controllable distributed power sources is far, it is easy for the uncontrollable distributed power sources to be unable to supply power independently and shut down and exit, which leads to technical problems such as low power generation utilization and power supply reliability in the distribution network.

[0003] Currently, no effective solution has been proposed for the technical problems of low power generation utilization and power supply reliability in the above-mentioned distribution network. Summary of the invention

[0004] The embodiments of the present invention provide a method, a device and a storage medium for islanding a distribution network, so as to at least solve the technical problems of low power generation utilization and low power supply reliability in the distribution network.

[0005] According to one aspect of the embodiment of the invention, a method for islanding a distribution network is provided. The method may include: obtaining target parameter information of a load in the distribution network, wherein the target parameter information is used to characterize the importance of the load in the island of the distribution network; based on the target parameter information and the target constraint condition, performing islanding on the distribution network to obtain the first output power of the load in the island, wherein the target constraint condition is used to put the island in a normal operating state; based on the first output power, detecting the operating state of an uncontrollable power supply in the distribution network, wherein the operating state is used to characterize the operating state of the uncontrollable power supply and other power supplies in the distribution network except the uncontrollable power supply in the connection state, and the uncontrollable power supply is a power supply in the distribution network without an energy storage device installed; in response to the operating state being the first operating state, determining the result of islanding the distribution network, wherein the first operating state is an island operating state when the uncontrollable power supply is connected in parallel with a controllable power supply in the distribution network, and the controllable power supply is a power supply in the distribution network with an energy storage device installed.

[0006] Optionally, the method also includes: in response to the operating state being the second operating state or the third operating state, using a control strategy to control the second output power of the uncontrollable power supply, and based on the second output power, target parameter information and target constraint conditions, islanding the distribution network to obtain the first output power, wherein the second operating state is that the uncontrollable power supply is in a grid-connected operating state, and the third operating state is that the uncontrollable power supply is in an independent island operating state.

[0007] Optionally, a control strategy is used to control the second output power of the uncontrollable power supply, including: using a phase-locked loop in a power grid-connected circuit of a distribution network to obtain a voltage phase of a power grid-connected point; based on the voltage phase, generating a modulation wave of the power grid-connected point; modulating the modulation wave to generate a pulse signal of the power grid-connected point; and determining the second output power of the uncontrollable power supply based on the pulse signal.

[0008] Optionally, based on the pulse signal, determining the second output power of the uncontrollable power supply includes: based on the pulse signal, controlling the switch of the full-bridge inverter circuit in the power grid-connected circuit to obtain the on / off state of the switch; and determining the second output power of the uncontrollable power supply based on the on / off state.

[0009] Optionally, target parameter information of loads in the distribution network is obtained, including: determining a self-importance coefficient based on the load type, wherein the self-importance coefficient is used to characterize the degree of influence of the load in the island, and the target parameter information includes the self-importance coefficient; and / or obtaining the network topology of the load; generating an adjacency matrix of the load based on the network topology; determining a position importance coefficient based on the adjacency matrix, wherein the position importance coefficient is used to characterize the degree of influence of the load's location in the island, and the target parameter information includes the position importance coefficient.

[0010] Optionally, based on target parameter information and target constraints, the distribution network is divided into islands to obtain the first output power of the load in the island, including: generating an objective function based on its own importance coefficient and location importance coefficient; and determining the first output power based on the objective function and target constraints.

[0011] Optionally, the target constraint conditions include: a first target constraint condition, a second target constraint condition, a third target constraint condition, a fourth target constraint condition and a fifth target constraint condition, wherein the first target constraint condition is used to characterize that the load in the island is connected to at least one power supply, the second target constraint condition is used to constrain the voltage in the island, the third target constraint condition is used to constrain the current in the island, the fourth target constraint condition is used to constrain the first output power of the load in the island, and the fifth target constraint condition is used to control the operating state of the power supply in the island.

[0012] According to one aspect of an embodiment of the present invention, a device for islanding a distribution network is provided. The device may include: a first acquisition unit, configured to acquire target parameter information of a load in the distribution network, wherein the target parameter information is used to characterize the importance of the load in the island of the distribution network; a second acquisition unit, configured to island the distribution network based on the target parameter information and the target constraint condition, and obtain the first output power of the load in the island, wherein the target constraint condition is used to put the island in a normal operating state; a detection unit, configured to detect the operating state of an uncontrollable power supply in the distribution network based on the first output power, wherein the operating state is used to characterize the operating state of the uncontrollable power supply in the distribution network when connected to other power supplies in the distribution network except the uncontrollable power supply, and the uncontrollable power supply is a power supply in the distribution network that is not equipped with an energy storage device; a determination unit, configured to determine the result of islanding the distribution network in response to the operating state being the first operating state, wherein the first operating state is an island operating state when the uncontrollable power supply is connected in parallel with a controllable power supply in the distribution network, and the controllable power supply is a power supply in the distribution network that is equipped with an energy storage device.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method in the embodiment of the present invention.

[0014] According to another aspect of the embodiments of the present invention, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the method in the embodiments of the present invention is implemented.

[0015] In an embodiment of the present invention, target parameter information of a load in a distribution network is obtained, wherein the target parameter information is used to characterize the importance of the load in an island of the distribution network; based on the target parameter information and the target constraint condition, the distribution network is islanded to obtain a first output power of the load in the island, wherein the target constraint condition is used to put the island in a normal operating state; based on the first output power, the operating state of an uncontrollable power supply in the distribution network is detected, wherein the operating state is used to characterize the operating state of the uncontrollable power supply in the distribution network when connected to other power supplies in the distribution network except the uncontrollable power supply, and the uncontrollable power supply is a power supply in the distribution network that is not equipped with an energy storage device; in response to the operating state being the first operating state, the islanding result of the distribution network is determined, wherein the first operating state is an island operating state when the uncontrollable power supply is connected in parallel with a controllable power supply in the distribution network, and the controllable power supply is a power supply in the distribution network that is equipped with an energy storage device. That is to say, the embodiment of the present invention can first obtain the target parameter information of the load in the distribution network, and then according to the target parameter information and target constraint conditions obtained above, the distribution network can be islanded to obtain the first output power of the load in the island, and finally according to the first output power, the operating state of the uncontrollable power supply in the distribution network is detected. If the operating state of the uncontrollable power supply at this time is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the islanding result of the distribution network at this time can be determined. Considering the first output power of the load in the island obtained by dividing the distribution network into islands, and the operating state of the uncontrollable power supply is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the purpose of determining the islanding result of the distribution network is achieved, thereby solving the technical problems of low power generation utilization and power supply reliability in the distribution network, and achieving the technical effect of improving the power generation utilization and power supply reliability in the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 is a flow chart of a method for islanding a distribution network according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of a distributed power source grid-connected according to an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of an SPWM principle according to an embodiment of the present invention;

[0020] Figure 4 is a flow chart of island division of a distribution network according to an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of an island division device for a distribution network according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] Example 1

[0025] According to an embodiment of the present invention, a method for islanding a distribution network is provided. It should be noted that in the flowchart of the accompanying drawings, the steps shown therein can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown here.

[0026] The following is an introduction to the method for dividing an island in a distribution network according to an embodiment of the present invention.

[0027] Figure 1 is a flow chart of a method for islanding a distribution network according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0028] Step S101, obtaining target parameter information of loads in the distribution network.

[0029] In the technical solution provided in the above step S101 of the present invention, the target parameter information of the load in the distribution network can be obtained, wherein the target parameter information is used to characterize the importance of the load within the island of the distribution network, and the target parameter information of the load can include the load's own importance coefficient and the load's location importance coefficient.

[0030] For example, the importance coefficient of load i in the distribution network can be obtained as ω i , the position importance coefficient of load i is δ i It should be noted that, here, only an example is given for the target parameter information of the load, and no specific limitation is given to the content that the target parameter information of the load may include.

[0031] Step S102: Based on the target parameter information and the target constraint conditions, the distribution network is divided into islands to obtain a first output power of the load in the island.

[0032] In the technical solution provided in the above step S102 of the present invention, after obtaining the target parameter information of the load, the distribution network can be islanded using the particle swarm algorithm according to the target parameter information and the target constraint conditions, so as to achieve the purpose of obtaining the first output power of the load in the island, wherein the target constraint conditions are used to put the island in normal operation.

[0033] Optionally, the particle swarm algorithm can be called a particle swarm optimization algorithm (Particle Swarm Optimization, referred to as PSO), which uses a velocity update formula and a position update formula to control each particle to move toward an individual extreme value and a group extreme value to achieve optimization, and outputs an optimal solution after a predetermined number of iterations.

[0034] Optionally, the target constraint condition includes a power constraint condition. The first output power of the load can be used to characterize the constraint limit reached by using the power constraint condition to constrain the load in the island in the process of islet partitioning the distribution network using the particle swarm algorithm.

[0035] For example, the factor that the uncontrollable distributed generation (DG) cannot adjust the output power can be ignored, and the particle swarm algorithm is used to perform island division until the power constraint limit is reached.

[0036] It can be understood that this is only a preferred implementation method for obtaining the first output power of the load in the island, and the process and method for obtaining the first output power of the load in the island are not specifically limited. As long as the process and method for obtaining the first output power of the load in the island are based on the target parameter information and target constraints, they are within the protection scope of the present invention and will not be repeated here.

[0037] Step S103: Detecting the operating status of the uncontrollable power source in the power distribution network based on the first output power.

[0038] In the technical solution provided in the above step S103 of the present invention, the operating state of the uncontrollable power source in the power distribution network can be detected according to the obtained first output power.

[0039] Optionally, the operating status is used to characterize the operating status of the uncontrollable power supply when connected to other power supplies in the distribution network except the uncontrollable power supply. The uncontrollable power supply is a power supply in the distribution network that does not have an energy storage device installed.

[0040] Optionally, the uncontrollable power source may be an uncontrollable distributed power source. According to whether an energy storage device can be installed on the DC side of the distributed power source, the power sources in the distribution network are divided into controllable DG and uncontrollable DG.

[0041] For example, after obtaining the first output power of the load in the isolated island, the operating state of the uncontrollable DG may be detected, and then the next step of processing may be performed according to the obtained operating state of the uncontrollable DG.

[0042] It should be noted that this is only a preferred implementation method for detecting the operating status of an uncontrollable power supply in a distribution network, and the process and method for detecting the operating status of an uncontrollable power supply in a distribution network are not specifically limited. As long as it is based on the first output power of the load in the island, the process and method for detecting the operating status of an uncontrollable power supply in a distribution network are within the protection scope of the present invention and are not listed here.

[0043] Step S104: in response to the operating state being the first operating state, determining an island division result of the distribution network.

[0044] In the technical solution provided in the above step S104 of the present invention, after detecting the operating state of the uncontrollable power supply in the distribution network, if the operating state is the first operating state, the island division result of the distribution network at this time can be determined, thereby ensuring the power quality of the island.

[0045] Optionally, the first operating state is an island operating state in which an uncontrollable power source and a controllable power source in a distribution network are connected in parallel. The controllable power source is a power source in the distribution network in which an energy storage device is installed. The controllable power source may be a controllable distributed power source.

[0046] For example, after obtaining the operating status of the uncontrollable power source, if the operating status at this time is the operating status of the uncontrollable DG and the controllable DG in parallel islanding, the power supply situation of the important loads in the distribution network can be checked, thereby ending the islanding process and outputting the islanding result, that is, outputting the optimal solution for the islanding.

[0047] In the above steps S101 to S104 of the present invention, the target parameter information of the load in the distribution network can be obtained first, and then the distribution network can be islanded according to the target parameter information and target constraint conditions obtained above, so as to obtain the first output power of the load in the island, and finally the operating state of the uncontrollable power supply in the distribution network is detected according to the first output power. If the operating state of the uncontrollable power supply at this time is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the islanding result of the distribution network at this time can be determined. Considering that the first output power of the load in the island obtained by islanding the distribution network, and the operating state of the uncontrollable power supply is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the purpose of determining the islanding result of the distribution network is achieved, thereby solving the technical problems of low power generation utilization and power supply reliability in the distribution network, and achieving the technical effect of improving the power generation utilization and power supply reliability in the distribution network.

[0048] The above method of this embodiment is further introduced below.

[0049] As an optional implementation mode, the method also includes: in response to the operating state being the second operating state or the third operating state, using a control strategy to control the second output power of the uncontrollable power supply, and based on the second output power, target parameter information and target constraint conditions, islanding the distribution network to obtain the first output power, wherein the second operating state is that the uncontrollable power supply is in a grid-connected operating state, and the third operating state is that the uncontrollable power supply is in an independent island operating state.

[0050] In this embodiment, after obtaining the operating state of the uncontrollable power supply in the distribution network, if the operating state at this time is the second operating state or the third operating state, the control strategy can be used to control the second output power of the uncontrollable power supply, and then according to the above-mentioned second output power, target parameter information and target constraint conditions, the distribution network can be islanded to obtain the first output power of the load. Among them, the control strategy can be called a power reduction operation control strategy, and can also be called an active standby control strategy.

[0051] For example, when the operating state of the uncontrollable power source is the uncontrollable DG grid-connected operating state, or the uncontrollable DG independent island operating state, the sine pulse width modulation technology (SPWM) can be used to control the opening and closing of the inverter switch device in the distribution network, so as to achieve the purpose of adjusting the output power of the uncontrollable DG and realize the power reduction operation of the uncontrollable DG. It should be noted that only the output power of the uncontrollable DG is adjusted here, and the adjustment method of the output power of the uncontrollable DG is not specifically limited.

[0052] As an optional implementation method, a control strategy is used to control the second output power of an uncontrollable power supply, including: using a phase-locked loop in a power grid-connected circuit of a distribution network to obtain a voltage phase of a power grid-connected point; based on the voltage phase, generating a modulation wave of the power grid-connected point; modulating the modulation wave to generate a pulse signal of the power grid-connected point; and determining the second output power of the uncontrollable power supply based on the pulse signal.

[0053] In this embodiment, in the process of controlling the second output power of the uncontrollable power supply by using the control strategy, the voltage phase of the power supply grid connection point can be obtained by using the phase-locked loop in the power supply grid connection circuit of the distribution network, and then the modulation wave of the power supply grid connection point can be generated according to the voltage phase obtained above, and then the modulation wave is modulated to generate a pulse signal of the power supply grid connection point, and finally the second output power of the uncontrollable power supply is determined according to the pulse signal. Among them, the modulation wave can be called a standard sine wave. The pulse signal can be called a six-pulse signal.

[0054] For example, Figure 2 is a schematic diagram of a distributed power source grid-connected according to an embodiment of the present invention, such as Figure 2 As shown, after the voltage phase of the DG grid connection point is extracted by using a phase-locked loop (PLL), a standard sine wave, i.e., a modulated wave, can be generated, and then a six-pulse signal is generated by using SPWM technology to control the opening and closing of the switch elements in the full-bridge inverter circuit, thereby achieving the purpose of determining the second output power of the uncontrollable power supply. Figure 2 Middle,U dc is the voltage amplitude on the input side of the inverter; and They are the three-phase voltages on the inverter output side; and They are the three-phase voltages at the grid connection point; and They are the three-phase currents flowing through the filter inductor L; and They are the three-phase currents of the filter capacitor C respectively, and pulse is used to represent the pulse.

[0055] As an optional implementation method, the second output power of the uncontrollable power supply is determined based on the pulse signal, including: based on the pulse signal, controlling the switch of the full-bridge inverter circuit in the power grid-connected circuit to obtain the on / off state of the switch; based on the on / off state, determining the second output power of the uncontrollable power supply.

[0056] In this embodiment, after obtaining the pulse signal, the switch of the full-bridge inverter circuit in the power grid-connected circuit can be controlled to achieve the purpose of obtaining the on / off state of the switch, and then based on the on / off state obtained above, the second output power of the uncontrollable power supply can be determined, wherein the switch can be called a switching element.

[0057] Optionally, a six-pulse signal is generated using SPWM technology to control the on / off of a switch element in a full-bridge inverter circuit so as to obtain an on / off state of the switch.

[0058] Optionally, after obtaining the modulated wave, the amplitude of the modulated wave may be compared with the amplitude of the carrier wave, thereby adjusting the second output power of the uncontrollable power source to achieve the purpose of determining the second output power of the uncontrollable power source.

[0059] For example, Figure 3 is a schematic diagram of an SPWM principle according to an embodiment of the present invention, such as Figure 3 As shown, the voltage relationship between the modulation wave, carrier and pulse within a certain period of time can be obtained, where t / s is used to indicate the time t in seconds (s), and U / V is used to indicate the voltage U in volts (V). When the modulation wave amplitude is greater than the carrier amplitude, the pulse signal is 1, otherwise it is -1; in addition, when the modulation wave amplitude increases, the resulting pulse width increases, that is, the inverter switch opening time becomes longer, so the output power of the uncontrollable DG increases, and vice versa, when the modulation wave amplitude decreases, the output power of the uncontrollable DG decreases.

[0060] For another example, when the modulation wave amplitude is changed, the output power of the uncontrollable DG can be adjusted. Therefore, according to the operating status of the uncontrollable DG, it can be divided into the following three cases: when the uncontrollable DG is connected to the grid, its modulation wave amplitude is set to the maximum value, and it must be less than the carrier amplitude; when the uncontrollable DG and the controllable DG are connected in parallel and operate in an island, the amplitude of the modulation wave is still set to the maximum value, and it must be less than the amplitude of the carrier; when the uncontrollable DG operates in an independent island, since the line reactance at the end of the distribution network no longer meets the condition of being much greater than the resistance, and the island voltage is often positively correlated with the active power output by the DG, the active power output can be adjusted according to the amplitude of the voltage at the DG grid connection point, thereby ensuring the power quality of the uncontrollable DG when it is independently supplied to the island.

[0061] As an optional implementation method, target parameter information of loads in a distribution network is obtained, including: determining a self-importance coefficient based on the load type, wherein the self-importance coefficient is used to characterize the degree of influence of the load in an isolated island, and the target parameter information includes the self-importance coefficient; and / or obtaining a network topology structure of the load; generating an adjacency matrix of the load based on the network topology structure; determining a position importance coefficient based on the adjacency matrix, wherein the position importance coefficient is used to characterize the degree of influence of the load's location in the isolated island, and the target parameter information includes the position importance coefficient.

[0062] In this embodiment, the importance coefficient ω of load i can be determined according to the load type of load i. i According to the importance of the load in the distribution network, it can be divided into primary load, secondary load and tertiary load. Among them, the sudden power outage of primary load may bring personal danger or equipment damage. The impact of secondary load and tertiary load is gradually reduced compared with the primary load. That is, the importance coefficient of the load used to represent the primary load, secondary load and tertiary load decreases in turn.

[0063] Optionally, the network topology of load i is first obtained, and then the adjacency matrix of load i can be generated based on the network topology. Finally, based on the adjacency matrix, the position importance coefficient δ of load i can be determined. i , where the position importance coefficient of load i is used to indicate the importance of the location of the load. For example, if there is a primary load, a secondary load or a tertiary load downstream of load i, the coefficient decreases successively.

[0064] As an optional implementation method, the distribution network is divided into islands based on target parameter information and target constraints to obtain the first output power of the load in the island, including: generating an objective function based on its own importance coefficient and location importance coefficient; and determining the first output power based on the objective function and target constraints.

[0065] In this embodiment, after obtaining the load's own importance coefficient and location importance coefficient, an objective function may be generated, and then based on the objective function and the objective constraint condition, the purpose of determining the first output power of the load in the island is achieved.

[0066] Optionally, it is necessary to enable the distributed power sources with self-starting capability in the island to start first, and then drive the distributed power sources without self-starting capability to start, so as to realize the island operation of distributed power sources. In order to give priority to supplying power to important loads and improve the power generation utilization rate of DG, the objective function f can be set and expressed by the following formula:

[0067]

[0068] Where: n is the number of loads; x i =1 means load i is powered; x i =0 means load i is not powered; ω i Indicates the importance of load i; δ i is the location importance of load i; m is the number of switches; y j =1 means switch j has been actuated; y j =0 means switch j is not actuated.

[0069] As an optional implementation method, the target constraint conditions include: a first target constraint condition, a second target constraint condition, a third target constraint condition, a fourth target constraint condition and a fifth target constraint condition, wherein the first target constraint condition is used to characterize that the load in the island is connected to at least one power supply, the second target constraint condition is used to constrain the voltage in the island, the third target constraint condition is used to constrain the current in the island, the fourth target constraint condition is used to constrain the first output power of the load in the island, and the fifth target constraint condition is used to control the operating state of the power supply in the island.

[0070] In this embodiment, the target constraint condition may include: a first target constraint condition, a second target constraint condition, a third target constraint condition, a fourth target constraint condition and a fifth target constraint condition, wherein the first target constraint condition may be called a connectivity constraint condition, that is, each load in the power supply area is connected to at least one DG, and a power supply area consisting only of loads cannot appear. The second target constraint condition may be called a voltage constraint condition, that is, the island voltage should be within the operating range specified by the standard to ensure the normal operation of each DG and load, thereby avoiding damage to electrical equipment.

[0071] Optionally, the third target constraint condition can be called a current constraint condition, which is that the line current should be less than or equal to the current limit to ensure the safety of the line and avoid overheating of the line due to excessive current. The fourth target constraint condition can be called a power constraint condition, that is, the sum of the power required by the load is less than or equal to the sum of the DG output power to ensure the stable operation of the island and avoid the phenomenon that the power quality of the island does not meet the requirements for a long time.

[0072] Optionally, the fifth target constraint condition can be called a distributed power type constraint condition, which is that there is at least one controllable DG or at least one uncontrollable DG in the power supply area working in a power reduction operation control strategy to adjust the output power and avoid the problem of island power quality exceeding the limit due to the lack of output power margin of the DG. It should be noted that only examples are given here for the constraints included in the target constraint conditions, and the types of constraints included in the target constraint conditions are not specifically limited.

[0073] Optionally, when using the particle swarm algorithm for island partitioning, the position state of the particle is often used to characterize the power supply state of the load, that is, the position state of the particle is 1, indicating that the load is powered, and the state is 0, indicating that the load is not powered, so it is called a binary particle swarm optimization algorithm. However, the dimension of the particle swarm increases with the complexity of the topological structure. Since the position state of each particle has no constraint relationship, it is easy to form a power supply area composed only of loads, which is an infeasible solution that does not meet the connectivity constraint. As a result, the algorithm needs to improve convergence through a large number of iterations, and then needs to set multiple different types of constraints to ensure that the island partition of the distribution network can operate normally.

[0074] In this embodiment, the target parameter information of the load in the distribution network can be obtained first, and then the distribution network can be islanded according to the target parameter information and target constraint conditions obtained above, so as to obtain the first output power of the load in the island, and finally the operating state of the uncontrollable power supply in the distribution network is detected according to the first output power. If the operating state of the uncontrollable power supply at this time is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the islanding result of the distribution network at this time can be determined. Considering the first output power of the load in the island obtained by islanding the distribution network, and the operating state of the uncontrollable power supply is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the purpose of determining the islanding result of the distribution network is achieved, thereby solving the technical problems of low power generation utilization and power supply reliability in the distribution network, and achieving the technical effect of improving the power generation utilization and power supply reliability in the distribution network.

[0075] Example 2

[0076] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0077] In recent years, the increase in installed capacity and penetration of distributed generation has made it possible for their island operation. At the same time, standard documents also stipulate that planned island operation of DG can be used to improve the power supply reliability of the distribution network.

[0078] The principle of island division is to maximize the power generation utilization rate of each DG in the blackout area and give priority to supplying power to important loads. Since the output of the uncontrollable DG depends entirely on the current temperature and light intensity of the photovoltaic panels, that is, it operates at the maximum power point, if the power required by the load increases at this time, it is difficult for the uncontrollable DG to output more power to meet the load demand, that is, the independent island operation of the uncontrollable DG is difficult to meet the power quality.

[0079] Furthermore, in order to realize the planned island power supply of distributed power sources, the existing partitioning methods can be divided into three categories: heuristic algorithms, mathematical optimization algorithms, and artificial intelligence algorithms. First, the heuristic algorithm will form a search path according to the topological structure of the power outage area, and then use connectivity constraints and power constraints to realize island partitioning. It has the advantage of fast optimization speed, but the disadvantage is that it is easy to fall into the local optimal solution; secondly, the mathematical optimization algorithm is mainly divided into branch and bound method and dynamic programming method, that is, it mainly uses the minimum spanning tree algorithm (Prim algorithm) and another minimum spanning tree algorithm (Kruskal algorithm) to transform the optimization problem into the problem of finding the minimum spanning tree. The advantage is that it is not constrained by the topological structure. However, with the increase of topological complexity, the disadvantage is that it is easy to fall into the dimensionality disaster.

[0080] However, the above method takes into account that when the electrical distance between the uncontrollable distributed power source and the controllable distributed power source is far, it is easy for the uncontrollable distributed power source to be unable to supply power independently and shut down and exit, thereby causing technical problems such as low power generation utilization and power supply reliability in the distribution network.

[0081] Therefore, in order to solve the above problems, the present invention proposes an expanding circle island division method based on particle swarm algorithm. The method first divides the distributed power source into controllable DG and uncontrollable DG according to whether the energy storage device is installed on the DC side of the distributed power source. For the uncontrollable DG without energy storage device installed, since it cannot adjust the output power, it may cause the uncontrollable DG to be difficult to achieve independent island operation. Therefore, a measure of classification according to its installed position is proposed. If the electrical distance between the uncontrollable DG and the controllable DG is short, it can be operated in parallel with the controllable DG, thereby achieving uncontrollable The full load operation of DG is realized; for the situation that the uncontrollable DG cannot be included in the power supply range of the controllable DG due to its small installed capacity or long electrical distance, a power reduction operation control strategy for the uncontrollable DG is proposed to avoid the shutdown and exit of the uncontrollable DG, and to improve its power generation utilization rate to a certain extent; secondly, with each DG as the center, the power supply range is gradually expanded from near to far, so as to realize the island division; finally, the power supply range of the uncontrollable DG under the condition of independent island operation is adjusted, that is, a certain power margin is left to ensure the power quality of the island, so as to realize the island division.

[0082] In an embodiment of the present invention, Figure 4 is a flow chart of island division of a distribution network according to an embodiment of the present invention. Figure 4 As shown, the flowchart mainly includes the following steps:

[0083] Step S401, importing the node number and power of the DG and load, as well as the load type and network topology of the load.

[0084] In this embodiment, parameter information such as the DG in the distribution network, the node number and power of the load, and the load type and network topology of the load can be obtained.

[0085] Optionally, according to the importance of the load in the distribution network, it can be divided into primary load, secondary load and tertiary load, among which, a sudden power outage of the primary load may bring personal danger or equipment damage, and the impact of the secondary load and the tertiary load is gradually reduced compared with the primary load.

[0086] Step S402, calculate the ω of each load i and δ i .

[0087] In this embodiment, the importance coefficient ω of each load is calculated. i , and use the adjacency matrix generated by the topological structure to calculate the location importance coefficient δ of each load i , and the load power supply coefficient x of the node where DG is located i Set to 1, the load power supply coefficient of the remaining nodes is x i Set to 0.

[0088] Optionally, in order to give priority to supplying power to loads with high importance, the load's own importance coefficient ω is set i and the load position importance coefficient δ i Among them, the load's own importance coefficient is divided into primary load, secondary load and tertiary load, and its importance coefficient decreases in turn, while the load's position importance coefficient indicates the importance of the load's position. For example, if there is a primary load, a secondary load or a tertiary load downstream of load i, the coefficient decreases in turn.

[0089] In this embodiment, after obtaining the self-importance coefficient ω of each load, i and position importance coefficient δ i After that, it is necessary to set the objective function and constraints to ensure the normal operation of the islanding of the distribution network.

[0090] Optionally, it is necessary to enable the distributed power sources with self-starting capability in the island to start first, and then drive the distributed power sources without self-starting capability to start, so as to realize the island operation of distributed power sources. In order to give priority to supplying power to important loads and improve the power generation utilization rate of DG, the objective function f can be set and expressed by the following formula:

[0091]

[0092] Where: n is the number of loads; x i =1 means load i is powered; x i =0 means load i is not powered; ω iIndicates the importance of load i; δ i is the location importance of load i; m is the number of switches; y j =1 means switch j has been actuated; y j =0 means switch j is not actuated.

[0093] Optionally, in order to ensure the stability of island operation, the operation state of the island needs to meet the following constraints: connectivity constraint, that is, each load in the power supply area is connected to at least one DG, and there cannot be a power supply area consisting only of loads; voltage constraint, which is to constrain the island voltage to be within the operating range specified by the standard to ensure the normal operation of each DG and load and avoid damage to electrical equipment; current constraint, that is, the line current should be less than or equal to the limit value to ensure the safety of the line and avoid overheating of the line due to excessive current; power constraint, that is, the sum of the power required by the load is less than or equal to the sum of the DG output power to ensure the stable operation of the island and avoid the phenomenon that the island power quality does not meet the requirements for a long time; distributed power type constraint, that is, there is at least one controllable DG or at least one uncontrollable DG in the power supply area working in a reduced power operation control strategy to adjust the output power and avoid the problem of island power quality exceeding the limit due to the lack of output power margin of the DG.

[0094] Step S403, using a particle swarm algorithm to perform expanding circle island division.

[0095] In this embodiment, the factor that the uncontrollable distributed power source cannot adjust the output power is ignored, and the particle swarm optimization algorithm is used to perform island division until the limit of the power constraint is reached. Among them, the particle swarm optimization algorithm uses the speed update formula and the position update formula to control each particle to move to the individual extreme value and the group extreme value to achieve optimization, and output the optimal solution after a predetermined number of iterations.

[0096] Optionally, when using the particle swarm algorithm for island partitioning, the position state of the particle is often used to characterize the power supply state of the load, that is, the position state of the particle is 1, indicating that the load is powered, and the state is 0, indicating that the load is not powered, so it is called a binary particle swarm optimization algorithm. However, the dimension of the particle swarm increases with the complexity of the topological structure. Since the position state of each particle has no constraint relationship, it is easy to form a power supply area composed only of loads, which is an infeasible solution that does not meet the connectivity constraint. As a result, the algorithm needs to improve convergence through a large number of iterations, and then needs to set multiple different types of constraints to ensure that the island partition of the distribution network can operate normally.

[0097] Step S404, determining whether the uncontrollable DG is running in parallel.

[0098] In this embodiment, the operating state of the uncontrollable DG is detected. If the operating state is that the uncontrollable DG and the controllable DG are connected in parallel to form an island, step S405 is executed; otherwise, step S406 is executed.

[0099] Step S405: outputting the optimal solution for island division.

[0100] In this embodiment, the power supply conditions of important loads in the distribution network are checked, thereby terminating the island division process and outputting the optimal solution for the island division.

[0101] Step S406: executing a power reduction operation control strategy for the uncontrollable DG.

[0102] In this embodiment, after the operation state of the uncontrollable DG is obtained, when the operation state of the uncontrollable power source is the uncontrollable DG grid-connected operation state, or the uncontrollable DG independent island operation state, the sine pulse width modulation technology can be used to control the opening and closing of the inverter switch device in the distribution network, so as to achieve the purpose of adjusting the output power of the uncontrollable DG and realize the power reduction operation of the uncontrollable DG, that is, Figure 2 shown. Figure 2 Middle,U dc is the voltage amplitude on the input side of the inverter; and They are the three-phase voltages on the inverter output side; and They are the three-phase voltages at the grid connection point; and They are the three-phase currents flowing through the filter inductor L; and They are the three-phase currents of the filter capacitor C respectively, and pulse is used to represent the pulse.

[0103] Alternatively, if Figure 3 It can be seen that when the modulation wave amplitude is greater than the carrier amplitude, the pulse signal is 1, otherwise it is -1; in addition, when the modulation wave amplitude increases, the resulting pulse width increases, that is, the inverter switch opening time becomes longer, so the output power of the uncontrollable DG increases, conversely, when the modulation wave amplitude decreases, the output power of the uncontrollable DG will decrease.

[0104] For example, when the modulation wave amplitude is changed, the output power of the uncontrollable DG can be adjusted. Therefore, according to the operating status of the uncontrollable DG, it can be divided into the following three cases: when the uncontrollable DG is connected to the grid, its modulation wave amplitude is set to the maximum value, and it must be less than the carrier amplitude; when the uncontrollable DG and the controllable DG are connected in parallel and operate in an island, the amplitude of the modulation wave is still set to the maximum value, and it must be less than the amplitude of the carrier; when the uncontrollable DG operates in an independent island, since the line reactance at the end of the distribution network no longer meets the condition of being much greater than the resistance, and the island voltage is often positively correlated with the active power output by the DG, the active power output can be adjusted according to the amplitude of the voltage at the DG grid connection point, thereby ensuring the power quality of the uncontrollable DG when it is independently supplied to the island.

[0105] In this embodiment, the target parameter information of the load in the distribution network can be obtained first, and then the distribution network can be islanded according to the target parameter information and target constraint conditions obtained above, so as to obtain the first output power of the load in the island, and finally the operating state of the uncontrollable power supply in the distribution network is detected according to the first output power. If the operating state of the uncontrollable power supply at this time is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the islanding result of the distribution network at this time can be determined. Considering the first output power of the load in the island obtained by islanding the distribution network, and the operating state of the uncontrollable power supply is the islanded operating state of the uncontrollable power supply and the controllable power supply in the distribution network in parallel, the purpose of determining the islanding result of the distribution network is achieved, thereby solving the technical problems of low power generation utilization and power supply reliability in the distribution network, and achieving the technical effect of improving the power generation utilization and power supply reliability in the distribution network.

[0106] Example 3

[0107] According to an embodiment of the present invention, a device for dividing an island in a distribution network is provided. It should be noted that the device for dividing an island in a distribution network can be used to execute a method for dividing an island in a distribution network in Embodiment 1.

[0108] Figure 5 Schematic diagram of an islanding division device for a distribution network according to an embodiment of the present invention. Figure 5 As shown, an islanding division device 500 for a power distribution network may include: a first acquisition unit 501 , a second acquisition unit 502 , a detection unit 503 and a determination unit 504 .

[0109] The first acquisition unit 501 is used to acquire target parameter information of a load in a distribution network, wherein the target parameter information is used to characterize the importance of the load in an isolated island of the distribution network.

[0110] The second acquisition unit 502 is used to divide the distribution network into islands based on the target parameter information and the target constraint conditions to obtain the first output power of the loads in the islands, wherein the target constraint conditions are used to keep the islands in normal operation.

[0111] The detection unit 503 is used to detect the operating status of the uncontrollable power supply in the distribution network based on the first output power, wherein the operating status is used to characterize the operating status of the uncontrollable power supply when connected to other power supplies in the distribution network except the uncontrollable power supply, and the uncontrollable power supply is a power supply in the distribution network that does not have an energy storage device installed.

[0112] The determination unit 504 is used to determine the island division result of the distribution network in response to the operating state being the first operating state, wherein the first operating state is an island operating state in which an uncontrollable power source and a controllable power source in the distribution network are connected in parallel, and the controllable power source is a power source in the distribution network in which an energy storage device is installed.

[0113] Optionally, the device also includes: a third acquisition unit, which is used to control the second output power of the uncontrollable power supply using a control strategy in response to the operating state being the second operating state or the third operating state, and to island the distribution network based on the second output power, target parameter information and target constraint conditions to obtain the first output power, wherein the second operating state is that the uncontrollable power supply is in a grid-connected operating state, and the third operating state is that the uncontrollable power supply is in an independent island operating state.

[0114] Optionally, the third acquisition unit that uses a control strategy to control the second output power of the uncontrollable power supply may also include: a first acquisition module, used to use a phase-locked loop in the power grid-connected circuit of the distribution network to acquire the voltage phase of the power grid-connected point; a first generation module, used to generate a modulation wave of the power grid-connected point based on the voltage phase; a second generation module, used to modulate the modulation wave to generate a pulse signal of the power grid-connected point; a first determination module, used to determine the second output power of the uncontrollable power supply based on the pulse signal.

[0115] Optionally, the first determination module may also include: an acquisition submodule, used to control the switch of the full-bridge inverter circuit in the power grid-connected circuit based on the pulse signal to obtain the on / off state of the switch; and a determination submodule, used to determine the second output power of the uncontrollable power supply based on the on / off state.

[0116] Optionally, the first acquisition unit 501 may include: a second determination module, used to determine the self-importance coefficient based on the load type of the load, wherein the self-importance coefficient is used to characterize the degree of influence of the load in the island, and the target parameter information includes the self-importance coefficient; and / or, a second acquisition module, used to obtain the network topology structure of the load; a third generation module, used to generate an adjacency matrix of the load based on the network topology structure; a third determination module, used to determine the position importance coefficient based on the adjacency matrix, wherein the position importance coefficient is used to characterize the degree of influence of the load's location in the island, and the target parameter information includes the position importance coefficient.

[0117] Optionally, the second acquisition unit 502 may include: a fourth generation module, used to generate an objective function based on its own importance coefficient and a position importance coefficient; and a fourth determination module, used to determine the first output power based on the objective function and the objective constraint condition.

[0118] Optionally, the target constraint conditions include: a first target constraint condition, a second target constraint condition, a third target constraint condition, a fourth target constraint condition and a fifth target constraint condition, wherein the first target constraint condition is used to characterize that the load in the island is connected to at least one power supply, the second target constraint condition is used to constrain the voltage in the island, the third target constraint condition is used to constrain the current in the island, the fourth target constraint condition is used to constrain the first output power of the load in the island, and the fifth target constraint condition is used to control the operating state of the power supply in the island.

[0119] In this embodiment, target parameter information of a load in a distribution network is acquired by a first acquisition unit, wherein the target parameter information is used to characterize the importance of the load in an island of the distribution network; the distribution network is islanded by a second acquisition unit based on the target parameter information and the target constraint condition, and a first output power of the load in the island is obtained, wherein the target constraint condition is used to put the island in a normal operating state; the operating state of an uncontrollable power supply in the distribution network is detected by a detection unit based on the first output power, wherein the operating state is used to characterize the operating state of the uncontrollable power supply in the distribution network when connected to other power supplies except the uncontrollable power supply in the distribution network, and the uncontrollable power supply is a power supply in the distribution network that is not equipped with an energy storage device; the islanding result of the distribution network is determined by a determination unit in response to the operating state being a first operating state, wherein the first operating state is an island operating state of the uncontrollable power supply in parallel with a controllable power supply in the distribution network, and the controllable power supply is a power supply in the distribution network that is equipped with an energy storage device, thereby solving the technical problem of low power generation utilization and power supply reliability in the distribution network, and achieving the technical effect of improving power generation utilization and power supply reliability in the distribution network.

[0120] Example 4

[0121] According to an embodiment of the present invention, a computer-readable storage medium is also provided, which includes a stored program, wherein when the program is executed by a processor, the device where the readable storage medium is located is controlled to execute the island division method of the distribution network in Example 1.

[0122] Example 5

[0123] According to an embodiment of the present invention, a computer program product is further provided, including a computer program, and when the computer program is executed by a processor, the method for islanding a distribution network in Embodiment 1 of the present invention is implemented.

[0124] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0125] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0126] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic, for example, the division of units can be a logical function division, and there can be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0127] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0128] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0129] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0130] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for islanding a distribution network, characterized in that: include: Acquire target parameter information of a load in a distribution network, wherein the target parameter information is used to characterize the importance of the load in an isolated island of the distribution network; Based on the target parameter information and the target constraint condition, the distribution network is divided into islands to obtain a first output power of the load in the island, wherein the target constraint condition is used to keep the island in a normal operating state; Based on the first output power, detecting an operating state of an uncontrollable power supply in the distribution network, wherein the operating state is used to characterize an operating state of the uncontrollable power supply when connected to other power supplies in the distribution network except the uncontrollable power supply, and the uncontrollable power supply is a power supply in the distribution network that is not equipped with an energy storage device; In response to the operating state being the first operating state, the island division result of the distribution network is determined, wherein the first operating state is an island operating state in which the uncontrollable power supply and the controllable power supply in the distribution network are connected in parallel, and the controllable power supply is the power supply in the distribution network in which the energy storage device is installed.

2. The method according to claim 1, characterized in that The method further comprises: In response to the operating state being the second operating state or the third operating state, the second output power of the uncontrollable power supply is controlled by using a control strategy, and based on the second output power, the target parameter information and the target constraint conditions, the distribution network is islanded to obtain the first output power, wherein the second operating state is that the uncontrollable power supply is in a grid-connected operating state, and the third operating state is that the uncontrollable power supply is in an independent island operating state.

3. The method according to claim 2, characterized in that Using a control strategy to control the second output power of the uncontrollable power supply includes: Using a phase-locked loop in a power grid-connected circuit of the distribution network, the voltage phase of a power grid-connected point is obtained; Based on the voltage phase, generating a modulation wave of the power grid connection point; Modulating the modulation wave to generate a pulse signal of the power grid connection point; Based on the pulse signal, the second output power of the uncontrollable power source is determined.

4. The method according to claim 3, characterized in that Determining the second output power of the uncontrollable power source based on the pulse signal includes: Based on the pulse signal, controlling the switch of the full-bridge inverter circuit in the power grid-connected circuit to obtain the on / off state of the switch; Based on the disconnection state, the second output power of the uncontrollable power supply is determined.

5. The method according to claim 1, characterized in that Obtain target parameter information of loads in the distribution network, including: Determining a self-importance coefficient based on the load type of the load, wherein the self-importance coefficient is used to characterize the influence of the load in the isolated island, and the target parameter information includes the self-importance coefficient; and / or, Acquire the network topology structure of the load; generate the adjacency matrix of the load based on the network topology structure; determine the position importance coefficient based on the adjacency matrix, wherein the position importance coefficient is used to characterize the influence of the position of the load in the island, and the target parameter information includes the position importance coefficient.

6. The method according to claim 5, characterized in that Based on the target parameter information and the target constraint condition, the distribution network is divided into islands to obtain a first output power of the load in the island, including: Generate an objective function based on the self-importance coefficient and the position importance coefficient; Based on the objective function and the objective constraint, the first output power is determined.

7. The method according to claim 1, characterized in that The target constraint conditions include: a first target constraint condition, a second target constraint condition, a third target constraint condition, a fourth target constraint condition and a fifth target constraint condition, wherein the first target constraint condition is used to characterize that the load in the isolated island is connected to at least one of the power supplies, the second target constraint condition is used to constrain the voltage in the isolated island, the third target constraint condition is used to constrain the current in the isolated island, the fourth target constraint condition is used to constrain the first output power of the load in the isolated island, and the fifth target constraint condition is used to control the operating state of the power supply in the isolated island.

8. An island division device for a distribution network, characterized in that: include: A first acquisition unit, configured to acquire target parameter information of a load in a distribution network, wherein the target parameter information is used to characterize the importance of the load in an isolated island of the distribution network; A second acquisition unit is used to divide the distribution network into islands based on the target parameter information and the target constraint condition to obtain a first output power of the load in the island, wherein the target constraint condition is used to put the island in a normal operating state; a detection unit, configured to detect an operating state of an uncontrollable power supply in the distribution network based on the first output power, wherein the operating state is used to characterize an operating state of the uncontrollable power supply when connected to other power supplies in the distribution network except the uncontrollable power supply, and the uncontrollable power supply is a power supply in the distribution network that is not equipped with an energy storage device; A determination unit is used to determine the island division result of the distribution network in response to the operating state being a first operating state, wherein the first operating state is an island operating state in which the uncontrollable power supply and the controllable power supply in the distribution network are connected in parallel, and the controllable power supply is the power supply in the distribution network in which the energy storage device is installed.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. A computer program product comprising computer instructions, characterized in that: When the computer instructions are executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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