Active power distribution network voltage fluctuation suppression method and device, equipment and storage medium

Abstract

The invention relates to the technical field of power grid voltage fluctuation suppression, in particular to an active power distribution network voltage fluctuation suppression method and device, equipment and a storage medium. Determining a plurality of first sensitive indexes according to the current voltage of the first target load feeder line and the first current compensation amount; determining a first voltage compensation amount according to the voltage deviation and / or the voltage fluctuation value of the first target load feeder line; and finally, determining a plurality of reactive compensation amounts according to the first voltage compensation amount, the plurality of first sensitive indexes and the reactive allowance of the plurality of power supply feeders. According to the invention, the power supply feeder is selected according to the first sensitive index to compensate the voltage of the target load feeder, the reactive adjustment amount is small, the voltage compensation efficiency is high, the influence on the voltage of other load feeders is small, and more obviously, the voltage fluctuation is compensated through reactive power, the consumption of the new energy is not influenced, and the consumption rate of the new energy is improved.

Description

Technical Field

[0001] This invention relates to the field of power grid voltage fluctuation suppression technology, and in particular to an active distribution network voltage fluctuation suppression method, apparatus, equipment and storage medium. Background Technology

[0002] Active distribution networks refer to distribution systems that connect distributed power sources (such as photovoltaic, wind power, and energy storage devices) to the traditional passive distribution networks that "only rely on the power supply of the upper-level substation and have unidirectional power flow". The core feature is the existence of bidirectional power flow between "power source and load", which can realize local production, consumption and dispatch of electricity. It is the core form of intelligent distribution that is adapted to the development of new energy.

[0003] Active power distribution networks can improve power supply reliability, and distributed power sources can operate in island mode when the main grid fails, ensuring power supply to critical loads such as medical care and communications; promote the consumption of new energy sources, consume renewable energy sources such as photovoltaic and wind power locally, reduce wind and solar curtailment, and reduce carbon emissions; reduce grid losses, shorten transmission distances through local power supply, and reduce power loss in transmission lines.

[0004] At the same time, the control of active distribution networks becomes more difficult. Two-way power flow breaks the traditional one-way scheduling mode, requiring more complex monitoring and scheduling strategies. Furthermore, the output of distributed power sources is affected by sunlight and wind speed, which can easily cause voltage fluctuations and frequency deviations.

[0005] Currently, active power distribution networks mainly suppress voltage fluctuations by regulating the grid-connected output of distributed power sources. However, this reduces the efficiency of distributed generation and results in low utilization of new energy power generation.

[0006] Therefore, it is necessary to develop and design an active distribution network voltage fluctuation suppression method. Summary of the Invention

[0007] The present invention provides a method, apparatus, device and storage medium for suppressing voltage fluctuations in active power distribution networks, which addresses the problem that existing active power distribution network voltage fluctuation suppression strategies tend to significantly impact the renewable energy absorption rate.

[0008] In a first aspect, embodiments of the present invention provide a method for suppressing voltage fluctuations in an active power distribution network, comprising: Obtain the first target load feeder, wherein the first target load feeder is the load feeder with the largest voltage deviation among multiple load feeders; Based on the current voltage of the first target load feeder and the first current compensation amount, a number of first sensitivity indices are determined. Each first sensitivity index corresponds to a power supply feeder. The first sensitivity index characterizes the degree of influence of the reactive current output by the power supply feeder on the voltage of the first target load feeder. The first voltage compensation amount is determined based on the voltage deviation and / or voltage fluctuation value of the first target load feeder; Based on the first voltage compensation amount, the plurality of first sensitivity indices, and the reactive power margin of the plurality of power feeders, a plurality of reactive power compensation amounts are determined, wherein each reactive power compensation amount corresponds to a power feeder.

[0009] In one possible implementation, determining a plurality of first sensitivity indices based on the current voltage of the first target load feeder and the first current compensation amount includes: The system acquires a first current compensation amount, a current state dataset of the power grid, and a power grid simulation model. The power grid simulation model is constructed based on an artificial neural network model. The power grid simulation model outputs the voltage of multiple load feeders based on the main power supply voltage, the active current of multiple feeders, and the reactive current of multiple feeders. The current state dataset of the power grid includes the main power supply voltage, the active current of multiple feeders, and the reactive current of multiple feeders at the current moment. The feeder current in the current state dataset of the power grid is compensated multiple times using the first current compensation amount to generate multiple pre-compensation datasets, wherein each time the feeder current in the current state dataset of the power grid is compensated, a pre-compensation dataset is generated. Each pre-compensation dataset is substituted into the power grid simulation model, and the voltage output by the power grid simulation model corresponding to the first target load feeder is used as the pre-compensation voltage. Substituting the multiple pre-compensation datasets and multiple pre-compensation voltages into the linear equation, multiple first sensitivity indices are obtained. The linear equation expresses the relationship between the main power supply voltage, the main power supply active current, the main power supply reactive current, the multiple power supply feeder active currents, the multiple power supply feeder reactive currents, and the voltage of the first target load feeder.

[0010] In one possible implementation, the linear equation is: In the formula, For pre-compensation voltage, Main power supply voltage, For the first The active power sensitivity index or reactive power sensitivity index of each feeder For the first The active or reactive current of each feeder To utilize the first current compensation amount for the second The current after compensation for each feeder current. For the first The active or reactive current of each feeder This is the first current compensation amount.

[0011] In one possible implementation, determining the first voltage compensation amount includes: Obtain voltage fluctuation values ​​and voltage deviation queues, wherein the voltage deviation queues include voltage deviations arranged in order of time nodes, the voltage deviation at the end of the deviation queue is the current voltage deviation of the first target load feeder, and the voltage fluctuation value is the difference between the current voltage of the first target load feeder and the voltage at the previous time node; The data in the voltage deviation queue are summed to obtain the deviation sum; The first voltage compensation amount is determined based on the voltage fluctuation value, the deviation, and the current voltage deviation of the first target load feeder.

[0012] In one possible implementation, determining the first voltage compensation amount based on the voltage fluctuation value, the deviation, and the current voltage deviation of the first target load feeder includes: Based on the first formula, the voltage fluctuation value, the deviation, and the current voltage deviation of the first target load feeder, a first voltage compensation amount is determined, wherein the first formula is: In the formula, This is the first voltage compensation amount. This represents the voltage fluctuation value. For deviation and sum, This represents the current voltage deviation of the first target load feeder.

[0013] In one possible implementation, determining multiple reactive power compensation amounts based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margins of the multiple power supply feeders includes: The multiple first sensitivity indices are arranged according to their values ​​to obtain a sensitivity index queue; The data retrieval position is selected based on the sign of the first voltage compensation amount, wherein the sign of the sensitivity index at the data retrieval position in the sensitivity index queue is opposite to the sign of the first voltage compensation amount. Reactive power compensation steps: Take out the sensitive index sequentially from the sensitive index queue according to the data acquisition position, determine the reactive power compensation amount according to the retrieved sensitive index, the first voltage compensation amount and the reactive power margin of the power supply feeder corresponding to the retrieved sensitive index, and update the first voltage compensation amount. If the updated first voltage compensation value is not zero, then update the data acquisition position and jump to the reactive power compensation step.

[0014] In one possible implementation, determining the reactive power compensation amount and updating the first voltage compensation amount based on the extracted sensitivity index, the first voltage compensation amount, and the reactive power margin of the power supply feeder corresponding to the extracted sensitivity index includes: The quotient of the first voltage compensation amount and the extracted sensitivity index is used as the reactive power compensation amount. If the calculated reactive power compensation amount is greater than the reactive power margin of the power feeder corresponding to the sensitivity index, then the reactive power margin of the power feeder corresponding to the sensitivity index is used as the reactive power compensation amount, the product of the reactive power compensation amount and the extracted sensitivity index is used as the actual voltage compensation amount, and the difference between the first voltage compensation amount and the actual voltage compensation amount is used as the updated first voltage compensation amount. Otherwise, the calculated reactive power compensation amount is used as the reactive power compensation amount, and the updated first voltage compensation amount is set to zero.

[0015] Secondly, embodiments of the present invention provide an active distribution network voltage fluctuation suppression device for implementing the active distribution network voltage fluctuation suppression method as described in the first aspect or any possible implementation thereof, wherein the active distribution network voltage fluctuation suppression device comprises: A voltage fluctuation feeder acquisition module is used to acquire a first target load feeder, wherein the first target load feeder is the load feeder with the largest voltage deviation among multiple load feeders; The sensitivity index determination module is used to determine multiple first sensitivity indices based on the current voltage of the first target load feeder and the first current compensation amount. Each first sensitivity index corresponds to a power feeder, and the first sensitivity index characterizes the degree of influence of the reactive current output by the power feeder on the voltage of the first target load feeder. The voltage compensation amount determination module is used to determine the first voltage compensation amount based on the voltage deviation and / or voltage fluctuation value of the first target load feeder; as well as, The voltage compensation module is used to determine multiple reactive power compensation amounts based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margin of multiple power feeders, wherein each reactive power compensation amount corresponds to one power feeder.

[0016] Thirdly, embodiments of the present invention provide an electronic device, including a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor executes the computer program to implement the steps of the method as described in the first aspect or any possible implementation of the first aspect.

[0017] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the method as described in the first aspect or any possible implementation thereof.

[0018] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: This invention discloses an active distribution network voltage fluctuation suppression method. First, a first target load feeder is obtained, wherein the first target load feeder is the load feeder with the largest voltage deviation among multiple load feeders. Then, based on the current voltage of the first target load feeder and a first current compensation amount, multiple first sensitivity indices are determined, wherein each first sensitivity index corresponds to a power supply feeder, and the first sensitivity index characterizes the degree of influence of the reactive current output by the power supply feeder on the voltage of the first target load feeder. Next, based on the voltage deviation and / or voltage fluctuation value of the first target load feeder, a first voltage compensation amount is determined. Finally, based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margin of the multiple power supply feeders, multiple reactive power compensation amounts are determined, wherein each reactive power compensation amount corresponds to a power supply feeder. This invention determines the power feeder that has the greatest impact on the voltage of the target load feeder by calculating the voltage reactive power sensitivity index of the power feeder. Then, it determines the voltage compensation amount based on the voltage fluctuation and voltage deviation of the target load feeder. According to the first sensitivity index, the power feeder is preferably selected to compensate the voltage of the target load feeder. Its reactive power adjustment is small, the voltage compensation efficiency is high, and the impact on the voltage of other load feeders is small. More significantly, by compensating for voltage fluctuations through reactive power, it does not affect the absorption of new energy sources and improves the absorption rate of new energy sources. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the active power distribution network voltage fluctuation suppression method provided by the embodiments of the present invention; Figure 2 This is an application scenario diagram of the active power distribution network voltage fluctuation suppression method provided by the embodiments of the present invention; Figure 3 This is a functional block diagram of the active power distribution network voltage fluctuation suppression device provided in the embodiments of the present invention; Figure 4This is a functional block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0021] In the following description, specific details such as particular system structures and techniques are set forth for illustrative purposes and not for limitation, so as to provide a thorough understanding of embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0022] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0023] The embodiments of the present invention will be described in detail below. This example is implemented based on the technical solution of the present invention, and provides detailed implementation methods and specific operation processes. However, the protection scope of the present invention is not limited to the following embodiments.

[0024] Figure 1 A flowchart of an active power distribution network voltage fluctuation suppression method provided for an embodiment of the present invention.

[0025] like Figure 1 As shown, a flowchart illustrating the implementation of the active power distribution network voltage fluctuation suppression method provided by an embodiment of the present invention is presented below in detail: In step 101, a first target load feeder is obtained, wherein the first target load feeder is the load feeder with the largest voltage deviation among multiple load feeders.

[0026] In step 102, multiple first sensitivity indices are determined based on the current voltage of the first target load feeder and the first current compensation amount. Each first sensitivity index corresponds to a power feeder, and the first sensitivity index characterizes the degree of influence of the reactive current output by the power feeder on the voltage of the first target load feeder.

[0027] In some implementations, determining a plurality of first sensitivity indices based on the current voltage of the first target load feeder and the first current compensation amount includes: The system acquires a first current compensation amount, a current state dataset of the power grid, and a power grid simulation model. The power grid simulation model is constructed based on an artificial neural network model. The power grid simulation model outputs the voltage of multiple load feeders based on the main power supply voltage, the active current of multiple feeders, and the reactive current of multiple feeders. The current state dataset of the power grid includes the main power supply voltage, the active current of multiple feeders, and the reactive current of multiple feeders at the current moment. The feeder current in the current state dataset of the power grid is compensated multiple times using the first current compensation amount to generate multiple pre-compensation datasets, wherein each time the feeder current in the current state dataset of the power grid is compensated, a pre-compensation dataset is generated. Each pre-compensation dataset is substituted into the power grid simulation model, and the voltage output by the power grid simulation model corresponding to the first target load feeder is used as the pre-compensation voltage. Substituting the multiple pre-compensation datasets and multiple pre-compensation voltages into the linear equation, multiple first sensitivity indices are obtained. The linear equation expresses the relationship between the main power supply voltage, the main power supply active current, the main power supply reactive current, the multiple power supply feeder active currents, the multiple power supply feeder reactive currents, and the voltage of the first target load feeder.

[0028] In some implementations, the linear equation is: In the formula, For pre-compensation voltage, Main power supply voltage, For the first The active power sensitivity index or reactive power sensitivity index of each feeder For the first The active or reactive current of each feeder To utilize the first current compensation amount for the second The current after compensation for each feeder current. For the first The active or reactive current of each feeder This is the first current compensation amount.

[0029] Exemplary embodiments of the present invention are applied to, for example, Figure 2 The active power distribution network shown in the diagram supplies power to the load 204 connected to the load feeder 203 via the main power source 201 through the bus 202, while the distributed generation source 206 generates electricity in parallel with the main power source 201 through the power feeder 205. As mentioned earlier, due to the characteristics of the distributed generation source 206, voltage fluctuations are likely to occur on the load feeder 203 of the distribution network.

[0030] This invention aims to propose a method for suppressing voltage fluctuations primarily by adjusting the reactive current output of distributed power sources. It mainly involves analyzing the sensitivity index of the reactive current output by the power source feeder in an active distribution network to the voltage of a first target feeder. Based on the voltage and voltage fluctuation of the first target feeder, a voltage compensation amount is determined. Finally, based on the voltage sensitivity index and the voltage compensation amount, the reactive current of the selected power source feeder is adjusted to suppress voltage fluctuations of the first target feeder.

[0031] As a crucial step in the aforementioned process, this invention determines the first sensitivity index for each power supply feeder based on a power grid simulation model and pre-constructed linear equations. The power grid simulation model is constructed from massive amounts of power grid operation data, and it can output the voltage of each load feeder based on the main power supply voltage, the active current of each feeder, and the reactive current of each feeder. The linear equation is an approximate relational equation that describes the relationship between the main power supply voltage, the active current of each feeder, the reactive current of each feeder, and the first target feeder voltage at a fixed operating point (when the current and voltage fluctuation range is very small, the relationship can be considered linear). Based on this linear equation, we can obtain the degree of influence of the power supply feeder reactive current on the first target feeder voltage, which is the first sensitivity index.

[0032] Specifically, we first obtain a current state dataset including the current main power supply voltage, the active current of each feeder, and the reactive current of each feeder. Then, we use a first current compensation amount to compensate for the active current and reactive current of each feeder (the first current compensation amount is a small current increment preset based on historical power grid fluctuation data, used to simulate the impact of reactive current changes on voltage). That is, each compensation generates a pre-compensation dataset.

[0033] These pre-compensation datasets are input one by one into the power grid simulation model, which provides the voltages of multiple load feeders (for each compensation dataset, the power grid simulation model provides the voltages of multiple load feeders). For each pre-compensation dataset, we take the voltage corresponding to the first target load feeder as the pre-compensation voltage. In other words, through the power grid simulation model, we assign a pre-compensation voltage to each pre-compensation dataset, forming a data pair.

[0034] Substituting the above data pairs into the linear equations yields multiple equations. Since the linear equations concern the sensitivity index, solving these equations simultaneously forms a system of equations, which gives the sensitivity index. The linear equations are: In the formula, For pre-compensation voltage, Main power supply voltage, For the first The active power sensitivity index or reactive power sensitivity index of each feeder For the first The active or reactive current of each feeder To utilize the first current compensation amount for the second The current after compensation for each feeder current. For the first The active or reactive current of each feeder This is the first current compensation amount.

[0035] In step 103, a first voltage compensation amount is determined based on the voltage deviation and / or voltage fluctuation value of the first target load feeder.

[0036] In some implementations, determining the first voltage compensation amount includes: Obtain voltage fluctuation values ​​and voltage deviation queues, wherein the voltage deviation queues include voltage deviations arranged in order of time nodes, the voltage deviation at the end of the deviation queue is the current voltage deviation of the first target load feeder, and the voltage fluctuation value is the difference between the current voltage of the first target load feeder and the voltage at the previous time node; The data in the voltage deviation queue are summed to obtain the deviation sum; The first voltage compensation amount is determined based on the voltage fluctuation value, the deviation, and the current voltage deviation of the first target load feeder.

[0037] In some implementations, determining the first voltage compensation amount based on the voltage fluctuation value, the deviation, and the current voltage deviation of the first target load feeder includes: Based on the first formula, the voltage fluctuation value, the deviation, and the current voltage deviation of the first target load feeder, a first voltage compensation amount is determined, wherein the first formula is: In the formula, This is the first voltage compensation amount. This represents the voltage fluctuation value. For deviation and sum, This represents the current voltage deviation of the first target load feeder.

[0038] For example, in compensating the first target load feeder, we need to determine the voltage compensation amount. This step is an important step in the compensation process. If the compensation amount determined in this step is too small, the compensation process will become very slow. If the compensation amount is too large, it may cause voltage fluctuations or oscillations, or cause abnormal fluctuations or out-of-tolerance voltages in other load feeders.

[0039] This invention constructs a voltage deviation queue based on voltage deviation. This voltage deviation queue typically begins when a significant voltage deviation occurs at the first target load feeder. For example, the voltage deviation range of the load feeder is... (Voltage deviation is the deviation relative to the rated voltage, i.e., current voltage - rated voltage). If it remains within this range, the voltage deviation of the load feeder is not counted. Once it exceeds this range, the voltage deviation will be added to the voltage deviation queue. When the voltage deviation of the load feeder returns to the voltage deviation range, the previous voltage deviation queue will be deleted.

[0040] As explained above, the voltage deviation queue includes the current voltage deviation, and the current voltage deviation is at the end of the queue. The difference between the last value of the voltage deviation queue and the second-to-last value is the voltage fluctuation value.

[0041] By summing the voltage deviations in the queue, we obtain the total deviation. Based on the total deviation, the voltage fluctuation value, and the current voltage deviation, we obtain the first voltage compensation amount using the first formula: In the formula, This is the first voltage compensation amount. This represents the voltage fluctuation value. For deviation and sum, This represents the current voltage deviation of the first target load feeder.

[0042] We can see that this first voltage compensation amount is determined based on the accumulated voltage deviation, voltage fluctuation value and the current voltage deviation. Therefore, its correction effect is good. Furthermore, since fluctuation is taken into account, the larger the fluctuation value, the more voltage compensation amount there is, so it also has a good effect on fluctuation suppression.

[0043] In step 104, multiple reactive power compensation amounts are determined based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margin of the multiple power feeders, wherein each reactive power compensation amount corresponds to a power feeder.

[0044] In some implementations, determining multiple reactive power compensation amounts based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margins of the multiple power supply feeders includes: The multiple first sensitivity indices are arranged according to their values ​​to obtain a sensitivity index queue; The data retrieval position is selected based on the sign of the first voltage compensation amount, wherein the sign of the sensitivity index at the data retrieval position in the sensitivity index queue is opposite to the sign of the first voltage compensation amount. Reactive power compensation steps: Take out the sensitive index sequentially from the sensitive index queue according to the data acquisition position, determine the reactive power compensation amount according to the retrieved sensitive index, the first voltage compensation amount and the reactive power margin of the power supply feeder corresponding to the retrieved sensitive index, and update the first voltage compensation amount. If the updated first voltage compensation value is not zero, then update the data acquisition position and jump to the reactive power compensation step.

[0045] In some implementations, determining the reactive power compensation amount and updating the first voltage compensation amount based on the extracted sensitivity index, the first voltage compensation amount, and the reactive power margin of the power feeder corresponding to the extracted sensitivity index includes: The quotient of the first voltage compensation amount and the extracted sensitivity index is used as the reactive power compensation amount. If the calculated reactive power compensation amount is greater than the reactive power margin of the power feeder corresponding to the sensitivity index, then the reactive power margin of the power feeder corresponding to the sensitivity index is used as the reactive power compensation amount, the product of the reactive power compensation amount and the extracted sensitivity index is used as the actual voltage compensation amount, and the difference between the first voltage compensation amount and the actual voltage compensation amount is used as the updated first voltage compensation amount. Otherwise, the calculated reactive power compensation amount is used as the reactive power compensation amount, and the updated first voltage compensation amount is set to zero.

[0046] For example, through the aforementioned steps, we know that the first sensitivity index is actually a signed value, meaning it can be positive or negative. We arrange multiple first sensitivity indices, for example, from largest to smallest, to obtain a sensitivity index queue. Then, we extract the extreme position of the sensitivity index with the opposite sign to the voltage compensation amount from this sensitivity index queue: for example, the voltage compensation amount has a positive sign, meaning the voltage of the first target load feeder needs to be increased. Since the sensitivity index queue is arranged from largest to smallest, we take the end of the queue as the data extraction position. Based on the data extraction position, we extract the sensitivity index from the sensitivity index queue and calculate the quotient of the first voltage compensation amount and the extracted sensitivity index. This quotient is the reactive power compensation calculation result. If this reactive power compensation calculation result is greater than the reactive power margin of the power feeder corresponding to the extracted sensitivity index (the difference between the current reactive power output of the power feeder and the maximum allowable reactive power output), then obviously the reactive power margin of the load feeder should be used as the reactive power compensation amount. The product of the reactive power margin and the extracted sensitivity index is the actual voltage compensation amount. We take the difference between the first voltage compensation amount and the actual voltage compensation amount as the updated first voltage compensation amount.

[0047] When the updated first voltage compensation is not 0, the sensitivity indexes need to be retrieved from the sensitivity index queue in sequence. According to the example above, the second to last sensitivity index should be retrieved at this time, and the above process of reactive power compensation calculation and first voltage compensation update should be repeated.

[0048] When the calculated reactive power compensation is less than the reactive power margin of the power supply feeder, we take the calculated reactive power compensation as the reactive power compensation of the power supply feeder, set the first voltage compensation to 0, and the compensation process ends.

[0049] The present invention provides an implementation method for suppressing voltage fluctuations in an active power distribution network. First, a first target load feeder is obtained, wherein the first target load feeder is the load feeder with the largest voltage deviation among multiple load feeders. Then, based on the current voltage of the first target load feeder and a first current compensation amount, multiple first sensitivity indices are determined, wherein each first sensitivity index corresponds to a power supply feeder, and the first sensitivity index characterizes the degree of influence of the reactive current output by the power supply feeder on the voltage of the first target load feeder. Next, based on the voltage deviation and / or voltage fluctuation value of the first target load feeder, a first voltage compensation amount is determined. Finally, based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margin of the multiple power supply feeders, multiple reactive power compensation amounts are determined, wherein each reactive power compensation amount corresponds to a power supply feeder. This invention determines the power feeder that has the greatest impact on the voltage of the target load feeder by calculating the voltage reactive power sensitivity index of the power feeder. Then, it determines the voltage compensation amount based on the voltage fluctuation and voltage deviation of the target load feeder. According to the first sensitivity index, the power feeder is preferably selected to compensate the voltage of the target load feeder. Its reactive power adjustment is small, the voltage compensation efficiency is high, and the impact on the voltage of other load feeders is small. More significantly, by compensating for voltage fluctuations through reactive power, it does not affect the absorption of new energy sources and improves the absorption rate of new energy sources.

[0050] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0051] The following are embodiments of the apparatus of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0052] Figure 3 This is a functional block diagram of the active power distribution network voltage fluctuation suppression device provided in the embodiments of the present invention, with reference to... Figure 3 The active distribution network voltage fluctuation suppression device includes: a voltage fluctuation feeder acquisition module 301, a sensitivity index determination module 302, a voltage compensation amount determination module 303, and a voltage compensation module 304, wherein: Voltage fluctuation feeder acquisition module 301 is used to acquire a first target load feeder, wherein the first target load feeder is the load feeder with the largest voltage deviation among multiple load feeders; Sensitivity index determination module 302 is used to determine multiple first sensitivity indices based on the current voltage of the first target load feeder and the first current compensation amount. Each first sensitivity index corresponds to a power feeder, and the first sensitivity index characterizes the degree of influence of the reactive current output by the power feeder on the voltage of the first target load feeder. The voltage compensation amount determination module 303 is used to determine the first voltage compensation amount based on the voltage deviation and / or voltage fluctuation value of the first target load feeder; The voltage compensation module 304 is used to determine multiple reactive power compensation amounts based on the first voltage compensation amount, the multiple first sensitivity indices, and the reactive power margin of multiple power feeders, wherein each reactive power compensation amount corresponds to one power feeder.

[0053] Figure 4 This is a functional block diagram of the electronic device provided in an embodiment of the present invention. For example... Figure 4 As shown, the electronic device 4 in this embodiment includes a processor 400 and a memory 401, wherein the memory 401 stores a computer program 402 that can run on the processor 400. When the processor 400 executes the computer program 402, it implements the steps of the above-described active power distribution network voltage fluctuation suppression methods and embodiments, for example... Figure 1 Steps 101 to 104 are shown.

[0054] For example, the computer program 402 may be divided into one or more modules / units, which are stored in the memory 401 and executed by the processor 400 to complete the present invention.

[0055] The electronic device 4 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. The electronic device 4 may include, but is not limited to, a processor 400 and a memory 401. Those skilled in the art will understand that... Figure 4 This is merely an example of electronic device 4 and does not constitute a limitation on electronic device 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 4 may also include input / output devices, network access devices, buses, etc.

[0056] The processor 400 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0057] The memory 401 can be an internal storage unit of the electronic device 4, such as a hard disk or memory. The memory 401 can also be an external storage device of the electronic device 4, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory 401 can include both internal and external storage units of the electronic device 4. The memory 401 is used to store the computer program 402 and other programs and data required by the electronic device 4. The memory 401 can also be used to temporarily store data that has been output or will be output.

[0058] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the aforementioned method embodiments, and will not be repeated here.

[0059] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0060] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0061] In the embodiments provided by this invention, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0062] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0063] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0064] If the integrated module / unit is implemented as 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, all or part of the processes in the above-described embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various methods and apparatus embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0065] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for active power distribution network voltage fluctuation suppression, characterized in that, The method comprises: obtaining a first target load feeder, wherein the first target load feeder is a load feeder with the largest voltage deviation among a plurality of load feeders; determining a plurality of first sensitivity indexes according to a current voltage of the first target load feeder and a first current compensation amount, wherein each first sensitivity index corresponds to a power feeder, and the first sensitivity index represents an influence degree of a reactive current output by the power feeder on the voltage of the first target load feeder; determining a first voltage compensation amount according to a voltage deviation and / or a voltage fluctuation value of the first target load feeder; determining a plurality of reactive compensation amounts according to the first voltage compensation amount, the plurality of first sensitivity indexes, and a reactive margin of the plurality of power feeders, wherein each reactive compensation amount corresponds to a power feeder.

2. The active power distribution network voltage fluctuation suppression method according to claim 1, characterized by, The method further comprises: obtaining a first current compensation amount, a current grid state data set, and a grid simulation model, wherein the grid simulation model is constructed according to an artificial neural network model, the grid simulation model outputs a voltage of a plurality of load feeders according to a main power supply voltage, active currents of a plurality of feeders, and reactive currents of the plurality of feeders, and the current grid state data set comprises the main power supply voltage, the active currents of the plurality of feeders, and the reactive currents of the plurality of feeders at a current time point; compensating feeder currents in the current grid state data set a plurality of times by using the first current compensation amount to generate a plurality of pre-compensation data sets, wherein each time of compensating the feeder currents in the current grid state data set generates a pre-compensation data set; substituting each pre-compensation data set into the grid simulation model, and taking a voltage corresponding to the first target load feeder output by the grid simulation model as a pre-compensation voltage; substituting the plurality of pre-compensation data sets and the plurality of pre-compensation voltages into a linear equation to obtain a plurality of first sensitivity indexes, wherein the linear equation represents a relationship between the main power supply voltage, the active current of the main power supply, the reactive current of the main power supply, the active currents of the plurality of power feeders, the reactive currents of the plurality of power feeders, and the voltage of the first target load feeder.

3. The active power distribution network voltage fluctuation suppression method according to claim 2, characterized by, The linear equation is: In the formula, is a pre-compensation voltage, is a main power supply voltage, is a first active or reactive sensitive index of a feeder, is a first active or reactive current of a feeder, is a current after compensation of the first feeder current by a first current compensation amount, is a first active or reactive current of a feeder, is a first current compensation amount.

4. The active power distribution network voltage fluctuation suppression method of claim 1, wherein The method further comprises: obtaining a voltage fluctuation value and a voltage deviation queue, wherein the voltage deviation queue comprises voltage deviations arranged in a time node order, a voltage deviation at the end of the voltage deviation queue is a current voltage deviation of the first target load feeder, and the voltage fluctuation value is a difference between a current voltage of the first target load feeder and a voltage at a previous time node; summing data in the voltage deviation queue to obtain a deviation sum; determining a first voltage compensation amount according to the voltage fluctuation value, the deviation sum, and the current voltage deviation of the first target load feeder.

5. The active power distribution network voltage fluctuation suppression method of claim 4, wherein, The method further comprises: determining a first voltage compensation amount according to a first formula, the voltage fluctuation value, the voltage deviation and, and a current voltage deviation of the first target load feeder, wherein the first formula is: In the formula, is a first voltage compensation amount, is a voltage fluctuation value, is a deviation sum, is a current voltage deviation of the first target load feeder.

6. The active power distribution network voltage fluctuation suppression method according to any one of claims 1 to 5, characterized by, determining a plurality of reactive power compensation amounts according to the first voltage compensation amount, the plurality of first sensitive indexes, and a plurality of reactive power margins of the plurality of power feeders, wherein each of the plurality of reactive power compensation amounts corresponds to one of the plurality of power feeders. arranging the plurality of first sensitive indexes according to the values to obtain a sensitive index queue; selecting a sampling position according to a sign of the first voltage compensation amount, wherein a sign of a sensitive index at the sampling position in the sensitive index queue is opposite to the sign of the first voltage compensation amount; a reactive power compensation step of sequentially sampling sensitive indexes from the sensitive index queue according to the sampling position, determining a reactive power compensation amount according to the sampled sensitive index, the first voltage compensation amount, and a reactive power margin of a power feeder corresponding to the sampled sensitive index, and updating the first voltage compensation amount; if the updated first voltage compensation amount is not zero, updating the sampling position and jumping to the reactive power compensation step.

7. The active power distribution network voltage fluctuation suppression method of claim 6, wherein, determining a reactive power compensation amount according to the sampled sensitive index, the first voltage compensation amount, and a reactive power margin of a power feeder corresponding to the sampled sensitive index, and updating the first voltage compensation amount, includes: taking a quotient of the first voltage compensation amount and the sampled sensitive index as a calculated reactive power compensation amount; if the calculated reactive power compensation amount is greater than the reactive power margin of the power feeder corresponding to the sensitive index, taking the reactive power margin of the power feeder corresponding to the sensitive index as the reactive power compensation amount, taking a product of the reactive power compensation amount and the sampled sensitive index as an actual voltage compensation amount, and taking a difference between the first voltage compensation amount and the actual voltage compensation amount as an updated first voltage compensation amount; otherwise, taking the calculated reactive power compensation amount as the reactive power compensation amount, and setting the updated first voltage compensation amount to zero.

8. An active power distribution network voltage fluctuation suppression device, characterized by, The active power distribution network voltage fluctuation suppression device for implementing the active power distribution network voltage fluctuation suppression method according to any one of claims 1 to 7, includes: a voltage fluctuation feeder acquisition module configured to acquire a first target load feeder, wherein the first target load feeder is a load feeder with a maximum voltage deviation among a plurality of load feeders; a sensitive index determination module configured to determine a plurality of first sensitive indexes according to a current voltage of the first target load feeder and a first current compensation amount, wherein each of the plurality of first sensitive indexes corresponds to a power feeder, and each of the plurality of first sensitive indexes represents an influence degree of a reactive current output by the power feeder on the voltage of the first target load feeder; a voltage compensation amount determination module configured to determine a first voltage compensation amount according to a voltage deviation and / or a voltage fluctuation value of the first target load feeder; and a voltage compensation module configured to determine a plurality of reactive power compensation amounts according to the first voltage compensation amount, the plurality of first sensitive indexes, and a plurality of reactive power margins of the plurality of power feeders, wherein each of the plurality of reactive power compensation amounts corresponds to one of the plurality of power feeders. The processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program.

9. An electronic device comprising a memory and a processor, said memory having stored therein a computer program operable on said processor, characterized in that, ​ 10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. The computer program, which is executed by a processor, implements the steps of the method according to any one of claims 1 to 7 when the above.

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