Method, device and equipment for suppressing voltage fluctuation of active power distribution network and storage medium

Abstract

The invention discloses an active power distribution network voltage fluctuation suppression method, device and equipment and a storage medium, and belongs to the technical field of power distribution network operation control, and the method comprises the steps: constructing a regulation and control object candidate set for active power distribution network voltage fluctuation suppression; the regulation economy of various regulation objects is compared, the regulation response speed and the regulation response capability of the regulation objects are analyzed, and regulation characteristic data of the various regulation objects are obtained; aiming at different time scale voltage fluctuations, respectively constructing differentiated active power distribution network voltage fluctuation suppression regulation and control models, and solving an objective function to obtain a regulation and control strategy of active power distribution network voltage fluctuation suppression; controlling each regulation and control object in combination with the voltage fluctuation condition of the active power distribution network; and analyzing typical characteristics appearing in different time scale voltage fluctuations, constructing different time scale voltage fluctuation switching criteria, and realizing automatic suppression of multi-time scale voltage fluctuations. According to the invention, voltage fluctuation suppression is realized, and the utilization efficiency of regulation and control resources is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a method, device, equipment and storage medium for active power distribution network voltage fluctuation suppression, and belongs to the technical field of power distribution network operation control. BACKGROUND

[0002] With the continuous advancement of new power system construction, the number of controllable'sources' such as distributed photovoltaic and energy storage and controllable 'loads' such as electric vehicles in the power distribution network increases sharply. The access of high-proportion distributed power and controllable load causes significant changes in the operation characteristics of the power distribution network. Especially, the strong randomness, strong intermittency and strong fluctuation of distributed power and distributed load make the power distribution of the power distribution network fluctuate frequently and the fluctuation amplitude increase, which causes the voltage of the power distribution network node to fluctuate seriously, affects the safe, reliable and efficient operation of the power distribution system, and is not compatible with the high-quality development goal of the new power system, that is, clean and low-carbon, safe and abundant, economic and efficient, supply and demand coordination, and flexible and intelligent. Therefore, a voltage fluctuation suppression method is needed to maintain the stability of the voltage of the power distribution system under the access of high-proportion distributed photovoltaic and flexible controllable load.

[0003] Existing published papers and published patents and other documents mainly achieve voltage fluctuation suppression by regulating active power or reactive power. The voltage fluctuation suppression device is divided into discrete and continuous control types, the voltage fluctuation control time scale is considered, and an optimization control model of the discrete and continuous control type voltage fluctuation suppression device is constructed. The action instructions of the discrete control device at each time and the power output instructions of the continuous control device in each preset time period are obtained, and finally a multi-time scale voltage fluctuation suppression scheme of the active power distribution network is formed.

[0004] However, the existing literature for realizing voltage fluctuation suppression has limitations. Almost all the literature does not consider the sensitivity of regulation and economy, and all the regulation strategies are used at the same time. In the case that the voltage fluctuation changes are not very large in adjacent time sequences, the model needs to be solved again and new regulation strategies are formed, which causes serious waste of regulation resources and prolongs the calculation and analysis time. SUMMARY

[0005] To solve the above problems, the application provides a method, device, equipment and storage medium for active power distribution network voltage fluctuation suppression.

[0006] The technical scheme adopted by the application to solve the technical problems is as follows: In a first aspect, the application provides a method for active power distribution network voltage fluctuation suppression, comprising the following steps: Step S1, constructing a candidate set of regulation objects for active power distribution network voltage fluctuation suppression; Step S2: Based on the candidate set of regulatory objects, compare the regulatory economy of various regulatory objects, and analyze the regulatory response speed and regulatory response capability of various regulatory objects to obtain the regulatory characteristic data of various regulatory objects; Step S3: For voltage fluctuations at different time scales, considering the regulation characteristic data of various control objects, construct differentiated active distribution network voltage fluctuation suppression and control models respectively, and solve the objective function of the active distribution network voltage fluctuation suppression and control model to obtain the control strategy for suppressing active distribution network voltage fluctuations. Step S4: Based on the voltage fluctuation situation of the active distribution network, the obtained control strategy for suppressing voltage fluctuations in the active distribution network is used to control each control object to achieve voltage fluctuation suppression. Step S5: Analyze the typical characteristics of voltage fluctuations at different time scales, construct switching criteria for voltage fluctuations at different time scales, and realize automated suppression of voltage fluctuations at multiple time scales.

[0007] As one possible implementation of this embodiment, the candidate set of control objects mainly includes {parallel capacitors, distributed photovoltaic grid-connected inverters, dynamic reactive power compensation devices, and battery energy storage}. The candidate set of control objects includes at least a discrete control object set {parallel capacitors} and a continuous control object set {distributed photovoltaic grid-connected inverters, dynamic reactive power compensation devices, and battery energy storage}. Parallel capacitors represent discrete control devices, distributed photovoltaic grid-connected inverters represent continuous control devices that can simultaneously adjust active and reactive power, dynamic reactive power compensation devices represent continuous control devices that can adjust reactive power, and battery energy storage represents continuous control devices that can adjust active power. The above four types of control devices cover almost all types of voltage regulation methods currently available. In actual operation, the above four control methods are included but not limited to.

[0008] As one possible implementation of this embodiment, in comparing the control economy of various control objects, the control economy of different voltage fluctuation suppression methods is characterized by the voltage control effect-cost sensitivity coefficient: (1), in, For nodes j Equipment adjustment costs, To adjust the voltage change at node i caused by the power change of device j. For nodes j The larger the voltage change at node i caused by the unit adjustment cost, the better the economic efficiency of the device in voltage control.

[0009] As one possible implementation of this embodiment, the process of comparing the economic efficiency of various control objects includes: The regulation economy of the voltage fluctuation adjustment means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is calculated respectively, and the regulation effect-cost sensitivity coefficients of them are , , , The dynamic reactive power compensation device, the shunt capacitor and the distributed photovoltaic grid-connected inverter mainly realize voltage regulation by adjusting the size of reactive power output, and the battery energy storage mainly realizes voltage regulation by adjusting active power output. , , , The regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage are respectively Based on the obtained regulation effect-cost sensitivity coefficients , , and The unit regulation cost of the voltage fluctuation adjustment means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is calculated respectively, and is recorded as , , and , , , and The unit regulation cost of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is respectively

[0010] As a possible implementation manner of the embodiment, in the process of comparing the regulation economy of various regulation objects, the calculation of the regulation economy of the voltage fluctuation adjustment means of the battery energy storage includes: When the device accessed by the node j is the battery energy storage, the regulation effect-cost sensitivity coefficient is: (2), Wherein, is the voltage-active sensitivity, is the adjustment amount of active power of the node j, is the unit active regulation cost of the battery energy storage; The calculation of the regulation economy of the voltage fluctuation adjustment means of the distributed photovoltaic grid-connected inverter includes: When the device accessed by the node j is the distributed photovoltaic, if only the reactive power of the device is adjusted, the regulation effect-cost sensitivity coefficient is: (3), (4), wherein, is the voltage-reactive sensitivity, is the voltage-active sensitivity, and are the adjustment amount of the distributed photovoltaic reactive power and active power of node j respectively, and is the unit active adjustment cost of the battery energy storage; When the device connected to node j is a reactive power compensation device (PC and SVC), the regulation effect-cost sensitivity coefficient is: (6), wherein, is the regulation effect-cost sensitivity coefficient of the reactive power compensation device, is the voltage-active sensitivity, is the adjustment amount of the reactive power of node j, is the unit active adjustment cost of the reactive power compensation device, m can be a shunt capacitor (PC) or a dynamic reactive power compensation device (SVC).

[0011] As a possible implementation manner of the embodiment, the regulation response capability of the various regulation objects includes: Suppose is the voltage-reactive sensitivity, is the voltage-active sensitivity, then the regulation response capability of the voltage fluctuation adjustment means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is respectively: (7), (8), (9), (10), wherein, are the change amount of the voltage of node i after regulating the different regulation objects of the adjustment amount of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor of node j respectively, , , and are the adjustable capacity of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor connected at node j.

[0012] As a possible implementation manner of the embodiment, the response speed of the regulation of the various regulation objects comprises: The response speed of the voltage fluctuation of the regulation object is related to the residual capacity of each regulation object. For the response capacity of each regulation object, the residual capacity after satisfying the system power balance is taken, and the expression is as follows: (11), wherein, G = g 1, g 2,…, g n is a set of controllable resources, is the total response capacity of each regulation object, is the response capacity of each regulation object in the set of controllable resources; When the active power distribution network has voltage fluctuation, the overall response characteristic curve of the system is different when the response capacity of different types of regulation objects is different. The overall response time of the system should take the maximum value of the response time of all the regulation objects participating in the regulation, that is: (12), wherein, is the overall response time of the system, is the response time of each regulation object; Therefore, at any time t, the equivalent response speed of the system is represented as: (13), wherein, is the equivalent response speed of the system at time t.

[0013] As a possible implementation manner of the embodiment, the objective function of the voltage fluctuation suppression regulation model of the active power distribution network comprises: The objective function of the economic optimization is: (15), And the correlation between the adjustment amount and the voltage fluctuation regulation weight is: (16), wherein, is the active power adjustment amount of the battery energy storage of node j, , , are the reactive power adjustment amounts of the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor respectively, , , , are the regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage, respectively; , , and are the regulation quantities of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, respectively, is the voltage-reactive power sensitivity, is the voltage-active power sensitivity, is the voltage fluctuation amplitude of node i, , , and are the voltage fluctuation regulation weights of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, respectively; The target function with the fastest response speed is: max k c (t) (17); The target function with the minimum voltage fluctuation of the system at different time scales is: (18), wherein, is the voltage of node i at time t, is a weight coefficient, is the penalty intensity for adjusting the deviation of each node voltage from the rated voltage, is the penalty intensity for adjusting the voltage change at adjacent time points, is the rated voltage of the system.

[0014] As a possible implementation manner of the embodiment, the target function of the voltage fluctuation suppression regulation model of the active power distribution network is solved to obtain a regulation strategy for the voltage fluctuation suppression of the active power distribution network, which includes: The target function of the voltage fluctuation suppression comprehensive regulation model is converted into a linear sum of the unit regulation cost and the regulation weight of the regulation object, and the target function is solved by a planning algorithm or an intelligent solving algorithm to obtain the regulation strategy for the voltage fluctuation suppression of the active power distribution network.

[0015] As a possible implementation manner of the embodiment, the regulation strategy for the voltage fluctuation suppression of the active power distribution network includes: Monitoring whether the voltage fluctuation occurs in the active power distribution network; Considering the tolerance capability of the equipment to the voltage fluctuation duration and the requirement of the regulation time, the regulation object is selected; According to the voltage fluctuation amplitude, different voltage fluctuation suppression methods are selected.

[0016] As a possible implementation manner of the embodiment, the selection of the regulation object includes: 1) If the device is not sensitive to voltage fluctuation, all the available regulation resources can be used as the regulation object; 2) If the device is sensitive to voltage fluctuation in time , the regulation object should not include the shunt capacitor, and the power electronic type regulation object is used for regulation; 3) If the device is sensitive to voltage fluctuation in time , all the available regulation resources cannot meet the requirement of the sensitive device for voltage stability, and the sensitive device directly exits the operation.

[0017] As a possible implementation manner of the embodiment, the different voltage fluctuation suppression methods are selected according to the voltage fluctuation amplitude, and the selection includes: 1) If the voltage fluctuation amplitude of the node i is , it is determined that the voltage fluctuation of the node is serious, and all the voltage fluctuation suppression measures are fully put into operation; 2) If the voltage fluctuation amplitude of the node i is , all the voltage fluctuation suppression measures are fully put into operation, and it is assumed that the voltage fluctuation regulation weights are , , and , formula (19) and formula (20) need to be met, that is: (19), (20), At this time, the regulation ability of various voltage fluctuation suppression measures is constrained: (21).

[0018] In the second aspect, the embodiment of the present application provides an active power distribution network voltage fluctuation suppression device, which includes: A data acquisition module is configured to construct a regulation object candidate set of the active power distribution network voltage fluctuation suppression; A data analysis module is configured to compare the regulation economy of various regulation objects based on the regulation object candidate set, analyze the regulation response speed and the regulation response ability of various regulation objects, and obtain regulation characteristic data of various regulation objects; A model construction module is configured to construct different active power distribution network voltage fluctuation suppression regulation models for different time scale voltage fluctuations by considering the regulation characteristic data of various regulation objects, solve the objective function of the active power distribution network voltage fluctuation suppression regulation model, and obtain the regulation strategy of the active power distribution network voltage fluctuation suppression; The voltage regulation module is configured to control each regulation object by using a regulation strategy obtained by suppressing voltage fluctuation of the active power distribution network in combination with voltage fluctuation of the active power distribution network. The voltage fluctuation suppression module is configured to analyze typical characteristics of voltage fluctuation of different time scales, construct switching criteria of voltage fluctuation of different time scales, and realize automatic suppression of voltage fluctuation of different time scales.

[0019] As a possible implementation manner of the embodiment, the regulation object candidate set is mainly {shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, and battery energy storage}, the regulation object candidate set includes at least a discrete regulation object set {shunt capacitor} and a continuous regulation object set {distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, and battery energy storage}, wherein the shunt capacitor is a representative of discrete regulation equipment, the distributed photovoltaic grid-connected inverter is a representative of continuous regulation equipment capable of adjusting active power and reactive power at the same time, the dynamic reactive power compensation device is a representative of continuous regulation equipment capable of adjusting reactive power, and the battery energy storage is a representative of continuous regulation equipment capable of adjusting active power; the above four kinds of regulation equipment almost cover all types of voltage regulation means at present, and in actual operation, the above four kinds of regulation means are included but not limited thereto.

[0020] As a possible implementation manner of the embodiment, the target function of the active power distribution network voltage fluctuation suppression regulation model includes: The target function of the economic optimality is: (15), The correlation between the regulation amount and the voltage fluctuation regulation weight is: (16), wherein, is the active power regulation amount of the battery energy storage of the node j, , , are the reactive power regulation amounts of the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the shunt capacitor respectively, , , , are the regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the battery energy storage respectively; , , and are the regulation amounts of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the shunt capacitor respectively, is the voltage-reactive sensitivity, is the voltage-active sensitivity, is the voltage fluctuation amplitude of node i, , , and are the voltage fluctuation regulation weights of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, respectively; The target function with the fastest response speed is: max k c (t) (17); The target function with the minimum voltage fluctuation of the system at different time scales is: (18), wherein, is the voltage of node i at time t, is the weight coefficient, is the penalty strength for adjusting the deviation of the voltage of each node from the rated voltage, is the penalty strength for adjusting the voltage change at adjacent time points, is the rated voltage of the system.

[0021] In a third aspect, an electronic device provided by an embodiment of the present application includes a processor, a memory and a bus, the memory stores machine-readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, and the processor executes the machine-readable instructions to perform the steps of any of the above methods for suppressing voltage fluctuation of an active power distribution network.

[0022] In a fourth aspect, a storage medium provided by an embodiment of the present application stores a computer program, and when the computer program is run by a processor, the steps of any of the above methods for suppressing voltage fluctuation of an active power distribution network are performed.

[0023] The technical solutions of the embodiments of the present application have the following beneficial effects: The present invention provides a method for suppressing voltage fluctuations in an active distribution network, comprising the following steps: Step S1, constructing a candidate set of control objects for suppressing voltage fluctuations in an active distribution network; Step S2, comparing the control economy of various control objects based on the candidate set, and analyzing their control response speed and control response capability to obtain control characteristic data of various control objects; Step S3, considering the control characteristic data of various control objects and constructing differentiated control models for suppressing voltage fluctuations in an active distribution network for different time scales, and solving the objective function of the control models to obtain control strategies for suppressing voltage fluctuations in an active distribution network; Step S4, combining the voltage fluctuation situation of the active distribution network, using the obtained control strategies for suppressing voltage fluctuations in an active distribution network to control each control object to achieve voltage fluctuation suppression; Step S5, analyzing the typical characteristics of voltage fluctuations at different time scales, constructing switching criteria for voltage fluctuations at different time scales, and achieving automated suppression of voltage fluctuations at multiple time scales. This invention constructs an active distribution network voltage fluctuation suppression control model that considers the sensitivity of control costs based on the economic efficiency of control. This model enables distribution systems with frequent voltage fluctuations to suppress voltage fluctuations while reducing the economic cost of voltage fluctuation timing suppression, shortening the generation time of voltage fluctuation suppression control strategies, and improving the utilization efficiency of control resources. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating a method for suppressing voltage fluctuations in an active power distribution network according to an exemplary embodiment; Figure 2 This is a distributed photovoltaic power-voltage control curve; Figure 3 This is a schematic diagram of an active distribution network voltage fluctuation suppression device according to an exemplary embodiment. Detailed Implementation

[0025] To more clearly illustrate the technical features of the present invention, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for suppressing voltage fluctuations in an active power distribution network, comprising the following steps: Step S1: Construct a candidate set of control targets for suppressing voltage fluctuations in active distribution networks; Step S2: Based on the candidate set of regulatory objects, compare the regulatory economy of various regulatory objects, analyze their regulatory response speed and regulatory response capability, and obtain the regulatory characteristic data of various regulatory objects; Step S3, for different time scale voltage fluctuations, considering the adjustment characteristics data of various regulation objects, respectively constructing differentiated active power distribution network voltage fluctuation suppression regulation model, and solving the objective function of active power distribution network voltage fluctuation suppression regulation model, obtaining the regulation strategy of active power distribution network voltage fluctuation suppression; Step S4, combining the voltage fluctuation of active power distribution network, using the obtained regulation strategy of active power distribution network voltage fluctuation suppression to control each regulation object, realizing voltage fluctuation suppression; Step S5, analyzing the typical characteristics of different time scale voltage fluctuations, constructing different time scale voltage fluctuation switching criteria, realizing automatic suppression of multi-time scale voltage fluctuations.

[0027] As a possible implementation manner of the embodiment, the regulation object candidate set is mainly {shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage}, the regulation object candidate set at least includes discrete regulation object set {shunt capacitor} and continuous regulation object set {distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage}, wherein the shunt capacitor is a representative of discrete regulation equipment, the distributed photovoltaic grid-connected inverter is a representative of continuous regulation equipment capable of adjusting active power and reactive power at the same time, the dynamic reactive power compensation device is a representative of continuous regulation equipment capable of adjusting reactive power, and the battery energy storage is a representative of continuous regulation equipment capable of adjusting active power; the above four kinds of regulation equipment almost cover all types of voltage regulation means at present, and in actual operation, the above four kinds of regulation means are included but not limited to.

[0028] As a possible implementation manner of the embodiment, in the process of comparing the regulation economy of various regulation objects, the regulation economy of different voltage fluctuation suppression means is represented by voltage regulation effect-cost sensitivity coefficient: (1), Wherein, is the adjustment cost of the equipment of node j is the voltage change of node i caused by the power change of node j equipment, is the voltage change of node i caused by the power change of node j equipment, is the adjustment cost of the equipment of node j unit adjustment cost causes the voltage change of node i, the larger the value is, the better the economy of the equipment participating in voltage control is.

[0029] As a possible implementation manner of the embodiment, the process of comparing the regulation economy of various regulation objects includes: The regulation economy of the voltage fluctuation regulation means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is calculated respectively, and the regulation effect-cost sensitivity coefficients of them are obtained in turn 、 、 、 Wherein, the dynamic reactive power compensation device, the shunt capacitor and the distributed photovoltaic grid-connected inverter mainly realize voltage regulation by adjusting the size of reactive power output, and the battery energy storage mainly realizes voltage regulation by adjusting the active power output; 、 、 、 The regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage are respectively Based on the obtained regulation effect-cost sensitivity coefficients 、 、 And The unit regulation cost of the voltage fluctuation regulation means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is calculated respectively, and is recorded as 、 、 And , 、 、 And The unit regulation cost of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is respectively

[0030] As a possible implementation manner of the embodiment, in the process of comparing the regulation economy of various regulation objects, the calculation of the regulation economy of the voltage fluctuation regulation means of the battery energy storage includes: When the device accessed by the node j is the battery energy storage, the regulation effect-cost sensitivity coefficient thereof is: (2), Wherein, is the voltage-active power sensitivity, is the adjustment amount of the active power of the node j, is the unit active regulation cost of the battery energy storage; The calculation of the regulation economy of the voltage fluctuation regulation means of the distributed photovoltaic grid-connected inverter includes: When the device accessed by the node j is the distributed photovoltaic, if only the reactive power thereof is adjusted, the regulation effect-cost sensitivity coefficient thereof is: (3), (4), Wherein, is the voltage-reactive power sensitivity, is the voltage-active power sensitivity, and are the regulation amount of distributed photovoltaic reactive power and active power of node j respectively, and is the unit active regulation cost of battery energy storage.

[0031] Figure 2 is the existing distributed photovoltaic power-voltage droop control curve, as shown in Figure 2 , a piecewise function is used to calculate the regulation effect-cost sensitivity coefficient of distributed photovoltaic, taking the normal voltage to voltage range of photovoltaic grid-connected point as an example (i.e. the Figure 2 interval in ), the regulation economic segmentation representation is shown in equation (5): (5) Wherein and The mathematical relationship between them can be calculated by referring to existing literature, which is not the focus of this patent, and will not be analyzed here.

[0032] When the device connected to node j is a reactive power compensation device (PC and SVC), the regulation effect-cost sensitivity coefficient is: (6), Wherein, is the regulation effect-cost sensitivity coefficient of the reactive power compensation device, is the voltage-active sensitivity, is the regulation amount of reactive power of node j, is the unit active regulation cost of the reactive power compensation device, m can be a shunt capacitor (PC) or a dynamic reactive power compensation device (SVC).

[0033] As a possible implementation manner of the embodiment, the regulation response capability of various regulation objects includes: Assuming is the voltage-reactive sensitivity, is the voltage-active sensitivity, then the regulation response capability of the voltage fluctuation regulation means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is respectively: (7), (8), (9), (10), Wherein, The change amount of the node i voltage after regulating the different regulating objects of the regulating amount of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor respectively, 、 、 and The controllable capacity of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor connected at the node j. The calculation method of the controllable capacity is related to many literatures, and will not be repeated here.

[0034] As a possible implementation manner of the embodiment, the control response speed of the various control objects includes: The control response speed of the voltage fluctuation is related to the remaining capacity of each control object. For the response capacity of each control object, the remaining capacity after satisfying the system power balance is taken, and the expression is as follows: (11), wherein, G ={ g 1, g 2, …, g n} is a set of controllable resources, is the total response capacity of each control object, is the response capacity of each control object in the set of controllable resources; When the voltage fluctuation occurs in the active power distribution network, the overall response characteristic curve of the system with different response capacities of different types of control objects is different. The overall response time of the system should take the maximum value of the response times of all the control objects participating in the control, that is: (12), wherein, is the overall response time of the system, is the response time of each control object; Then, at any time t, the equivalent response speed of the system is represented as: (13), wherein, is the equivalent response speed of the system at time t.

[0035] As a possible implementation manner of the embodiment, for a single control object, the response time is mainly determined by the nature of the control object itself, and the control time of the power electronic device is usually much smaller than that of the ordinary electrical device. It is obtained that the control response speed of the controllable distributed photovoltaic grid-connected inverter, the battery energy storage and the dynamic reactive power compensation device is basically the same, and is much smaller than the control response speed of the shunt capacitor which is a discrete type of regulating device, that is: (14) wherein, is the regulation response speed of the battery energy storage, is the regulation response speed of the distributed photovoltaic grid-connected inverter, is the regulation response speed of the dynamic reactive power compensation device, is the regulation response speed of the shunt capacitor.

[0036] As a possible implementation manner of the embodiment, the objective function of the active power distribution network voltage fluctuation suppression regulation model has three optimization regulation targets, which are respectively: Optimization regulation target 1: economic optimization, then the optimization regulation target 1 is: (15), And the correlation between the adjustment amount and the voltage fluctuation regulation weight is: (16), wherein, is the active power adjustment amount of the battery energy storage of node j, , , are respectively the reactive power adjustment amounts of the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, , , , are respectively the regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage; , , and are respectively the adjustment amounts of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, is the voltage-reactive sensitivity, is the voltage-active sensitivity, is the voltage fluctuation amplitude of node i, , , and are respectively the voltage fluctuation regulation weights of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor; Optimization regulation target 2: fastest response speed, then the optimization regulation target 2 is: max k c (t) (17); Optimization regulation target 3: minimum system voltage fluctuation at different time scales, then the optimization regulation target 3 is: (18), wherein, is the voltage of node i at time t, is a weight coefficient, is a penalty strength for adjusting the deviation of each node voltage from the rated voltage, is a penalty strength for adjusting the voltage change between adjacent time points, is the rated voltage of the system.

[0037] As a possible implementation manner of the present embodiment, the solution of the objective function of the active power distribution network voltage fluctuation suppression regulation model obtains a regulation strategy for the active power distribution network voltage fluctuation suppression, and includes: The objective function of the voltage fluctuation suppression comprehensive regulation model is converted into a linear sum of the unit regulation cost of the regulation object and the regulation weight, the objective function is solved by a planning algorithm or an intelligent solving algorithm, and the regulation strategy for the active power distribution network voltage fluctuation suppression is obtained.

[0038] As a possible implementation manner of the present embodiment, the regulation strategy for the active power distribution network voltage fluctuation suppression includes: monitoring whether a voltage fluctuation occurs in the active power distribution network; selecting a regulation object by considering the tolerance of the device to the voltage fluctuation duration and the requirement of the regulation time; selecting different voltage fluctuation suppression methods according to the voltage fluctuation amplitude.

[0039] As a possible implementation manner of the present embodiment, the selection of the regulation object by considering the tolerance of the device to the voltage fluctuation duration and the requirement of the regulation time includes: 1) If the device is not sensitive to the voltage fluctuation, the obtained regulatable resources can all be used as the regulation object; 2) If the device is sensitive to the voltage fluctuation within a time , the regulation object should not contain a shunt capacitor, and a power electronic type regulation object is used for regulation at this time; 3) If the device is sensitive to the voltage fluctuation within a time , the obtained regulation resources cannot meet the requirement of the sensitive device to the voltage stability, and the sensitive device directly exits the operation.

[0040] As a possible implementation manner of the present embodiment, the selection of different voltage fluctuation suppression methods according to the voltage fluctuation amplitude includes: 1) If the voltage fluctuation amplitude of node i is , it is determined that the voltage fluctuation of the node is serious, and all voltage fluctuation suppression measures are fully put into operation; 2) If the voltage fluctuation amplitude of node i is , the voltage fluctuation suppression measures are all put into operation, assuming that the voltage fluctuation control weights are 、 、 and , formula (19) and formula (20) need to be met, that is: (19), (20), At this time, the control ability of various voltage fluctuation suppression measures is constrained: (21).

[0041] As shown in Figure 3 , the device for active power distribution network voltage fluctuation suppression provided by the embodiment of the application comprises: A data acquisition module is configured to construct a candidate set of control objects for active power distribution network voltage fluctuation suppression. A data analysis module is configured to compare the control economy of various control objects based on the candidate set of control objects, analyze the control response speed and control response ability of the control objects, and obtain adjustment characteristic data of the control objects. A model construction module is configured to construct differentiated active power distribution network voltage fluctuation suppression control models for different time scale voltage fluctuations by considering the adjustment characteristic data of various control objects, solve the objective functions of the active power distribution network voltage fluctuation suppression control models, and obtain control strategies for active power distribution network voltage fluctuation suppression. A voltage control module is configured to control various control objects by combining the voltage fluctuation of the active power distribution network and using the obtained control strategies for active power distribution network voltage fluctuation suppression. A voltage fluctuation suppression module is configured to analyze typical characteristics of different time scale voltage fluctuations, construct switching criteria for different time scale voltage fluctuations, and realize automatic suppression of multi-time scale voltage fluctuations.

[0042] As a possible implementation manner of the embodiment, the candidate set of the regulation objects mainly includes {shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, and battery energy storage}, and the candidate set of the regulation objects at least includes a discrete regulation object set {shunt capacitor} and a continuous regulation object set {distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, and battery energy storage}, wherein the shunt capacitor is a representative of the discrete regulation device, the distributed photovoltaic grid-connected inverter is a representative of the continuous regulation device capable of simultaneously regulating active power and reactive power, the dynamic reactive power compensation device is a representative of the continuous regulation device capable of regulating reactive power, and the battery energy storage is a representative of the continuous regulation device capable of regulating active power; the above four regulation devices almost cover all types of voltage regulation means at present, and in actual operation, the above four regulation means are included but are not limited to the above four regulation means.

[0043] As a possible implementation manner of the embodiment, the optimization regulation target of the active power distribution network voltage fluctuation suppression regulation model has three, which are respectively: Optimization regulation target 1: economic optimization (15), And the correlation between the regulation amount and the voltage fluctuation regulation weight is: (16), Wherein, is the active power regulation amount of the battery energy storage of the node j, , , are the reactive power regulation amounts of the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the shunt capacitor respectively, , , , are the regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the battery energy storage respectively; , , and are the regulation amounts of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the shunt capacitor respectively, is the voltage-reactive sensitivity, is the voltage-active sensitivity, is the voltage fluctuation amplitude of the node i, , , and are the voltage fluctuation regulation weights of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device, and the shunt capacitor respectively; Optimization regulation target 2: fastest response speed: max k c (t) (17) ; Optimization of control target 3, minimum voltage fluctuation of system at different time scales: (18), Wherein, Vi is the voltage of node i at time t, is a weight coefficient, is the penalty strength for adjusting the deviation of each node voltage from the rated voltage, is the penalty strength for adjusting the voltage change at adjacent time points, is the rated voltage of the system.

[0044] In the specific implementation process, the specific process of active power distribution network voltage fluctuation suppression carried out by the present application is as follows.

[0045] Step 1: Construct a new type of power distribution system voltage fluctuation suppression control object candidate set {shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage}, and divide it into two subsets: discrete control object set {shunt capacitor}; Continuous control object set {distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage}, wherein the shunt capacitor is a representative of discrete adjustment equipment, the distributed photovoltaic grid-connected inverter is a representative of continuous adjustment equipment that can adjust active power and reactive power at the same time, the dynamic reactive power compensation device is a representative of continuous adjustment equipment that can adjust reactive power, and the battery energy storage is a representative of continuous adjustment equipment that can adjust active power; The above four kinds of adjustment equipment almost cover all types of voltage regulation means at present, in actual operation, including but not limited to the above 4 kinds of adjustment means.

[0046] Step 2: Analyze the adjustment characteristics of various voltage fluctuation suppression control objects, as follows: Step 21: Comparison of control economy; The control economy of different voltage fluctuation suppression means can be characterized by voltage control effect-cost sensitivity coefficient. The expression is as follows (1): (1), Wherein, is the adjustment cost of the device of node j, j is the voltage change of node i caused by the adjustment of the power of node j device, is the voltage change of node i caused by the adjustment of the power of node j device, is the voltage change of node i caused by the adjustment of the power of node j device, j The larger the value is, the better the economy of the device participating in voltage control is.

[0047] Further, the regulation economy of voltage fluctuation adjustment means such as shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage, etc. can be calculated respectively. Taking battery energy storage adjustment (active power adjustment) and distributed photovoltaic adjustment (reactive power adjustment) as examples, the calculation method of the index is described.

[0048] 1) When the device accessed by node j is battery energy storage, the regulation effect-cost sensitivity calculation is shown in formula (2): (2), wherein, is voltage-active power sensitivity, is the adjustment amount of active power of node j, is the unit active power adjustment cost of battery energy storage.

[0049] 2) When the device accessed by node j is distributed photovoltaic, if only the reactive power thereof is adjusted, the regulation effect-cost sensitivity calculation is shown in formula (3) and (4): (3), (4), wherein, is voltage-reactive power sensitivity, is voltage-active power sensitivity, and are the adjustment amount of reactive power and active power of node j distributed photovoltaic, and are the unit active power adjustment cost of battery energy storage; When the device accessed by node j is reactive power compensation device (PC and SVC), the regulation effect-cost sensitivity coefficient is: (6), wherein, is the regulation effect-cost sensitivity coefficient of reactive power compensation device, is voltage-active power sensitivity, is the adjustment amount of reactive power of node j, is the unit active power adjustment cost of reactive power compensation device, m may be shunt capacitor (PC) or dynamic reactive power compensation device (SVC).

[0050] On this basis, the regulation effect-cost sensitivity coefficients of shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage, etc. can be obtained in turn as , , , Among them, the dynamic reactive power compensation device, the shunt capacitor and the distributed photovoltaic grid-connected inverter mainly realize voltage regulation by adjusting the size of reactive power output, and the battery energy storage mainly realizes voltage regulation by adjusting the active power output.

[0051] Under the above four adjustment modes, there are many patents and documents on the unit adjustment cost of reactive power / active power, and the specific calculation method is not repeated here. The adjustment cost of shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device and battery energy storage is respectively denoted as , , , .

[0052] Step 22: Analysis of regulation response capability; The regulation response capability represents the influence degree of the full participation of the regulation device of the node j in the adjustment on the voltage variation of the node i , which is mainly determined by two factors, one is the sensitivity of the node voltage to the device adjustment of active power / reactive power, and the other is the capacity of the device adjustable active power / reactive power. Assuming that is the voltage-reactive sensitivity, is the voltage-active sensitivity, the regulation response capability of the four voltage regulation methods proposed can be respectively expressed as: (7), (8), (9), (10), wherein, are the voltage variation of node i after adjusting the regulation amount of battery energy storage, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device and shunt capacitor of node j respectively, , , and are the adjustable capacity of the battery energy storage, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device and shunt capacitor connected at node j.

[0053] Step 22: Analysis of regulation response speed; The regulation response speed of the various regulation objects includes: The regulation object voltage fluctuation response speed is related to the remaining capacity of each regulation object. For the response capacity of various regulation objects, the remaining capacity after meeting the system power balance is taken, and the expression is as follows: (11), wherein, G = g 1, g 2, …, g n is a set of controllable resources, is the total responsive capacity of various control objects, is the responsive capacity of various control objects in the set of controllable resources; When voltage fluctuation occurs in the active power distribution network, the overall response characteristic curve of different types of control objects in the system is different due to different responsive capacities of the control objects. The overall response time of the system should take the maximum value of the response times of all participating control objects, that is: (12), wherein, is the overall response time of the system, is the response time of various control objects; Therefore, at any time t, the equivalent response speed of the system is represented as: (13), wherein, is the equivalent response speed of the system at time t.

[0054] As a possible implementation manner of the embodiment, for a single control object, the response time is mainly determined by the nature of the control object itself, and the control time of power electronic devices is usually much smaller than that of ordinary electrical devices. The control response speed of the distributed photovoltaic grid-connected inverter, battery energy storage and dynamic reactive power compensation device is basically the same and much smaller than that of the parallel capacitor which is a discrete adjustment device, that is: (14) wherein, is the control response speed of the battery energy storage, is the control response speed of the distributed photovoltaic grid-connected inverter, is the control response speed of the dynamic reactive power compensation device, is the control response speed of the parallel capacitor.

[0055] Step 3: Constructing an active power distribution network voltage fluctuation suppression control model considering the sensitivity of control cost.

[0056] The objective function of the active power distribution network voltage fluctuation suppression control model has three optimization control objectives, which are: Optimization control objective 1: economic optimization, then the optimization control objective 1 is: (15), The correlation between the adjustment amount and the voltage fluctuation regulation weight is: (16), Among them, is the active power adjustment amount of the battery energy storage of node j, , , Qj, Qd, Qc and Qb are the reactive power adjustment amounts of the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor respectively, , , , Qj, Qd, Qc and Qb are the regulation effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage respectively; , , and Qj, Qd, Qc and Qb are the adjustment amounts of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor respectively, is the voltage-reactive sensitivity, is the voltage-active sensitivity, is the voltage fluctuation amplitude of node i, , , and Qj, Qd, Qc and Qb are the voltage fluctuation regulation weights of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor respectively; Optimization regulation target 2: the fastest response speed, then the optimization regulation target 2 is: max k c (t) (17); Optimization regulation target 3: the minimum system voltage fluctuation of different time scales, then the optimization regulation target 3 is: (18), Among them, is the voltage of node i at time t, is the weight coefficient, is the penalty intensity for adjusting the deviation of each node voltage from the rated voltage, is the penalty intensity for adjusting the voltage change of adjacent time points, is the rated voltage of the system.

[0057] The constraint conditions include power flow constraints and system safety constraints, and there are many related literatures on power flow constraints and safety constraints, which have no innovation, so they are not described here.

[0058] This step comprehensively considers the node iThe amplitude of voltage fluctuation, the tolerance time of load to voltage fluctuation, the sensitivity of voltage fluctuation suppression regulation cost, and the active power distribution network voltage fluctuation suppression regulation model considering the sensitivity of regulation cost are constructed.

[0059] Step 31: the system voltage fluctuation is started, and the voltage fluctuation suppression program is started.

[0060] Step 32: considering the tolerance of the device to the voltage fluctuation duration and the requirement of the regulation time, the regulation object is selected: 1) if the device is not sensitive to voltage fluctuation, the resulting adjustable resources can be used as the regulation object; 2) if the device is sensitive to voltage fluctuation for a certain time , the regulation object should not contain the shunt capacitor, and the power electronic type regulation object is taken for regulation at this time; 3) if the device is sensitive to voltage fluctuation for a certain time , the resulting regulation resources cannot meet the requirement of voltage stability of sensitive devices, and the sensitive devices directly exit operation.

[0061] Step 33: according to the voltage fluctuation amplitude, different voltage fluctuation suppression methods are selected: 1) if the voltage fluctuation amplitude of node i is , it is determined that the voltage fluctuation of the node is serious, and all voltage fluctuation suppression measures are put into operation, and at this time, the complete suppression of voltage fluctuation cannot be realized; 2) if the voltage fluctuation amplitude of node i is , it is assumed that the four kinds of voltage fluctuation suppression measures are put into operation, and the voltage fluctuation regulation weights are , , and , then formula (19) and formula (20) need to be met, that is: (19), (20), At this time, the regulation ability of various voltage fluctuation suppression measures is constrained: (21).

[0062] At this time, the objective function is changed into the linear sum of the unit regulation cost of the regulation object and the regulation weight, which can be solved by planning algorithm or intelligent solving algorithm, and finally the regulation strategy set is obtained.

[0063] Step 4: combining the voltage fluctuation and the obtained voltage fluctuation suppression regulation strategy, the regulation object is controlled, and the voltage fluctuation suppression is realized.

[0064] Step S5, typical features of voltage fluctuation of different time scales are analyzed, a switching criterion of voltage fluctuation of different time scales is constructed, and automatic suppression of voltage fluctuation of different time scales is realized.

[0065] The electronic device provided by the embodiment of the present application comprises a processor, a memory and a bus, the memory stores machine readable instructions executable by the processor, the processor and the memory communicate through the bus when the device is running, and the processor executes the machine readable instructions to perform the steps of the method for suppressing voltage fluctuation of any active power distribution network as described above.

[0066] Specifically, the memory and the processor can be general memory and processor, which are not specifically limited here, and can execute the method for suppressing voltage fluctuation of the active power distribution network when the processor runs the computer program stored in the memory.

[0067] Those skilled in the art can understand that the structure of the electronic device does not constitute a limitation on the electronic device, and can include more or fewer components than the illustration, or combine certain components, or split certain components, or different component arrangements.

[0068] In some embodiments, the electronic device can further include a touch screen that can be used to display a graphical user interface (e.g., a launch interface of an application) and receive a user operation (e.g., a launch operation of the application) on the graphical user interface. The touch screen can include a display panel and a touch panel. The display panel can be configured in the form of an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode), or the like. The touch panel can collect a contact or non-contact operation of a user on or near the touch panel and generate a pre-set operation instruction, for example, an operation of the user using a finger, a stylus, or any suitable object, or an accessory on or near the touch panel. In addition, the touch panel can include a touch detection device and a touch controller. The touch detection device detects a touch position and a gesture of the user and detects a signal generated by the touch operation and transmits the signal to the touch controller. The touch controller receives the touch information from the touch detection device, converts the touch information into information that can be processed by a processor, and sends the information to the processor. The touch controller can also receive a command from the processor and execute the command. In addition, the touch panel can be implemented in various types such as a resistive type, a capacitive type, an infrared type, and a surface acoustic wave type, or any technology developed in the future. Further, the touch panel can cover the display panel. The user can operate on or near the touch panel covering the display panel according to the graphical user interface displayed on the display panel. The touch panel detects the operation on or near the touch panel and transmits the operation to the processor to determine a user input. The processor then provides a corresponding visual output on the display panel in response to the user input. In addition, the touch panel and the display panel can be implemented as two independent components or integrated.

[0069] Corresponding to the above-mentioned application launching method, the embodiment of the present application further provides a storage medium, and the storage medium stores a computer program. When the computer program is run by a processor, the steps of the above-mentioned any active power distribution network voltage fluctuation suppression method are executed.

[0070] The application launching device provided by the embodiment of the present application can be specific hardware on a device or software or firmware installed on the device, etc. The device provided by the embodiment of the present application has the same implementation principle and technical effects as the above-mentioned method embodiments. For brevity and conciseness, the part not mentioned in the device embodiment part can be referred to the corresponding content in the above-mentioned method embodiments. Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-mentioned system, device, and unit can be referred to the corresponding process in the above-mentioned method embodiments, which will not be described herein.

[0071] Those skilled in the art will appreciate that embodiments of the application can be supplied as a method, a system, or a computer program product. Accordingly, the application can be embodied in the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can be in the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk memory, CD-ROMs, optical storage media, etc.) embodying computer readable program code.

[0072] In the embodiments provided by the present application, it should be understood that the disclosed apparatus and method can be implemented in other manners. The embodiments described above are merely exemplary, and the division of the modules is merely logical function division, and there can be other division manners in actual implementation. For example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between modules can be indirect coupling or communication connection through some interfaces, and can be electrical, mechanical or other forms.

[0073] The modules illustrated as separated components can or can not be physically separated, and the components illustrated as modules can or can not be physical modules, i.e., can be located in one place, or can be distributed on a plurality of network modules. Some or all of the modules can be selected according to actual needs to achieve the purposes of the embodiments.

[0074] In addition, each functional module in the embodiments provided by the present application can be integrated in a processing module, or each module can exist physically independently, or two or more modules can be integrated in one module.

[0075] The present application is described with reference to flowcharts and / or block diagrams according to the method, device (system) and computer program product of the embodiments of the present application. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device for implementing the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or a plurality of flows and / or blocks Figure 1 The device for implementing the functions specified in one flow or a plurality of flows and / or blocks.

[0076] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the flow Figure 1 one or more flows and / or blocks Figure 1 one or more blocks or multiple blocks.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions executed on the computer or other programmable apparatus provide steps for implementing the flow Figure 1 one or more flows and / or blocks Figure 1 one or more blocks or multiple blocks.

[0078] Finally, it should be noted that the above-mentioned embodiments are merely used to illustrate the technical solutions of the present application, rather than limiting the same. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced equivalently, and any modification or replacement without departing from the spirit and scope of the present application should be covered within the protection scope of the claims of the present application.

Claims

1. A method of active power distribution network voltage fluctuation suppression, characterized by, The method comprises the following steps: Step S1, constructing a candidate set of regulation objects for active power distribution network voltage fluctuation suppression; Step S2, comparing the regulation economy of various regulation objects based on the candidate set of regulation objects, and analyzing the regulation response speed and regulation response capacity of various regulation objects to obtain regulation characteristic data of various regulation objects; Step S3, for different time scale voltage fluctuations, considering the regulation characteristic data of various regulation objects, respectively constructing differentiated active power distribution network voltage fluctuation suppression regulation models, and solving the objective function of the active power distribution network voltage fluctuation suppression regulation model to obtain a regulation strategy for active power distribution network voltage fluctuation suppression; Step S4, combining the voltage fluctuation of the active power distribution network, and using the obtained regulation strategy for active power distribution network voltage fluctuation suppression to control each regulation object; Step S5, analyzing the typical characteristics of different time scale voltage fluctuations, constructing a switching criterion for different time scale voltage fluctuations, and realizing automatic suppression of multi-time scale voltage fluctuations.

2. The method of active power distribution network voltage fluctuation suppression according to claim 1, characterized in that, The candidate set of regulation objects mainly includes {shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage}, and the candidate set of regulation objects at least includes a discrete regulation object set {shunt capacitor} and a continuous regulation object set {distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device, battery energy storage}.

3. The method of active power distribution network voltage fluctuation suppression according to claim 2, characterized in that, In the process of comparing the regulation economy of various regulation objects, the regulation economy of different voltage fluctuation suppression means is represented by a voltage regulation effect-cost sensitivity coefficient: （1）， wherein, is the node j regulation cost of the device, is the voltage change of node i caused by the device power change of the regulation node j, is the node j voltage change of node i caused by the unit regulation cost.

4. The method of active power distribution network voltage fluctuation suppression according to claim 3, characterized in that, The process of comparing the regulation economy of various regulation objects includes: The regulation economy of voltage fluctuation adjustment means of shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device and battery energy storage is calculated respectively, and the regulation effect-cost sensitivity coefficient of them is , , , , wherein, the dynamic reactive power compensation device and the shunt capacitor mainly realize voltage regulation by adjusting the size of reactive power output, the distributed photovoltaic grid-connected inverter can simultaneously regulate voltage by adjusting active power and reactive power, and the battery energy storage mainly regulates voltage by adjusting active power output. Based on the obtained regulation effect-cost sensitivity coefficient , , and , the unit regulation cost of the voltage fluctuation regulation means of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage is calculated respectively and recorded as , , and , , , and are the unit regulation costs of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage respectively.

5. The method of active power distribution network voltage fluctuation suppression according to claim 4, characterized in that, In the process of comparing the regulation economy of various regulation objects, the calculation of the regulation economy of the voltage fluctuation regulation means of the battery energy storage includes: When the device connected to node j is a battery energy storage, the regulation effect-cost sensitivity coefficient is: （2）， wherein, is the voltage-active sensitivity, is the regulation of the active power at node j, is the unit active regulation cost of the battery storage; The calculation of the regulation economy of the voltage fluctuation regulation means of the distributed photovoltaic grid-connected inverter includes: When the device connected to node j is a distributed photovoltaic device, if only the reactive power of the device is regulated, the regulation effect-cost sensitivity coefficient is: （3）， (4)， wherein, is the voltage-reactive sensitivity, is the voltage-active sensitivity, and are the nodal distributed photovoltaic reactive and active power regulation quantities, respectively, and is the unit active regulation cost of the battery energy storage; When the device connected to node j is a reactive power compensation device, the regulation effect-cost sensitivity coefficient is: （6）， wherein is the regulation effect - cost sensitivity coefficient of the reactive power compensation device, is the voltage - active power sensitivity, is the regulation amount of the reactive power at node j, is the unit active regulation cost of the reactive power compensation device, m is taken as the parallel capacitor or dynamic reactive power compensation device.

6. The method of active power distribution network voltage fluctuation mitigation according to claim 5, wherein, The regulation response capacity of various regulation objects includes: Assume is the voltage-reactive sensitivity, is the voltage-active sensitivity, the regulation response capabilities of the voltage fluctuation adjustment means of shunt capacitor, distributed photovoltaic grid-connected inverter, dynamic reactive power compensation device and battery energy storage are respectively: （7）， （8）， （9）， （10）， wherein, are the change of the regulated quantity of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor respectively, and the change of the voltage of the node i after the different regulation and control objects are regulated, , , and are the adjustable capacity of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor connected at the node j.

7. The method of active power distribution network voltage fluctuation mitigation according to claim 1, wherein, The regulation response speed of various regulation objects includes: The total response capacity of various regulation objects is calculated as: (11)， wherein, G ={ g 1, g 2,…, g n} is a set of controllable resources, is a total responsive capacity of various control objects, is a responsive capacity of various control objects in the set of controllable resources; When the active power distribution network has voltage fluctuation, the overall response time of the system should be the maximum value of the response times of all the regulation objects participating in the regulation, that is: （12）， wherein, is the overall system response time, is the response time of various regulated objects; Therefore, at any time t, the equivalent response speed of the system is represented as: (13)， wherein, is the equivalent system response velocity at time t.

8. The method of active power distribution network voltage fluctuation mitigation of claim 1, wherein, For a single regulation object, the response time is mainly determined by the nature of the regulation object itself, and the regulation time of power electronic devices is usually much smaller than that of ordinary electrical devices. Therefore, the regulation response speeds of the continuously adjustable distributed photovoltaic grid-connected inverter, battery energy storage and dynamic reactive power compensation device are basically the same, and are much smaller than the regulation response speed of the discrete regulation device shunt capacitor, that is: （14） Wherein, The regulation response speed of the battery energy storage, The regulation response speed of the distributed photovoltaic grid-connected inverter, The regulation response speed of the dynamic reactive power compensation device, The regulation response speed of the shunt capacitor.

9. The method of active power distribution network voltage fluctuation mitigation according to any one of claims 1-8, wherein, The objective function of the active power distribution network voltage fluctuation suppression regulation model includes: The objective function with optimal economy is: （15）， And the correlation between the regulation amount and the voltage fluctuation regulation weight is: （16）， wherein, is the active power regulation amount of the battery energy storage at node j, , , are the reactive power regulation amounts of the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, respectively, , , , are the regulation-effect-cost sensitivity coefficients of the shunt capacitor, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the battery energy storage, respectively; , , and are the regulation amounts of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, respectively, is the voltage-reactive sensitivity, is the voltage-active sensitivity, is the voltage fluctuation amplitude at node i, , , and are the voltage fluctuation regulation weights of the battery energy storage, the distributed photovoltaic grid-connected inverter, the dynamic reactive power compensation device and the shunt capacitor, respectively. The target function with the fastest response speed is: max k c (t) (17); The target function with the minimum voltage fluctuation of the system at different time scales is: （18）， wherein, Vt(i) is the voltage of node i at time t, is a weight coefficient, is a penalty strength for adjusting the deviation of each node voltage from the rated voltage, is a penalty strength for adjusting the voltage change between adjacent time points, is a rated voltage of the system.

10. The method of active power distribution network voltage fluctuation mitigation according to claim 9, wherein, The target function of the active power distribution network voltage fluctuation suppression regulation model is solved to obtain the regulation strategy for active power distribution network voltage fluctuation suppression, which includes: The target function of the voltage fluctuation suppression comprehensive regulation model is converted into the linear sum of the unit regulation cost and the regulation weight of the regulation object, and the target function is solved by a planning algorithm or an intelligent solving algorithm to obtain the regulation strategy for active power distribution network voltage fluctuation suppression.

11. The method of active power distribution network voltage fluctuation mitigation of claim 10, wherein, The regulation strategy for active power distribution network voltage fluctuation suppression includes: Monitoring whether voltage fluctuation occurs in the active power distribution network; Considering the tolerance of the equipment to the duration of voltage fluctuation and the requirement for regulation time, the regulation object is selected; According to the voltage fluctuation amplitude, different voltage fluctuation suppression methods are selected.

12. The method of active power distribution network voltage fluctuation mitigation of claim 11, wherein, The selection of the regulation object considering the tolerance of the equipment to the duration of voltage fluctuation and the requirement for regulation time includes: If the equipment is not sensitive to voltage fluctuation, the resulting controllable resources can all be used as regulation objects; If the device is sensitive to voltage fluctuations for a time Then the regulated object should not contain a parallel capacitor, in which case the power electronics type regulating object is taken for regulation; If the device is sensitive to voltage fluctuations , the resulting regulatory resources cannot meet the requirements of sensitive devices for voltage stability, and the sensitive devices directly exit operation.

13. The method of active power distribution network voltage fluctuation mitigation of claim 11, wherein, The selection of different voltage fluctuation suppression methods according to the voltage fluctuation amplitude includes: If the voltage fluctuation amplitude of node i is determined to be serious, all the voltage fluctuation suppression measures are put into operation. If the voltage fluctuation amplitude of node i , all the voltage fluctuation suppression measures are fully put into operation, and it is assumed that the voltage fluctuation control weights are , , and , then formula (19) and formula (20) need to be met, that is: （19）， （20）， At this time, the regulation ability of various voltage fluctuation suppression measures is constrained: （21）。 14. An apparatus for active power distribution network voltage fluctuation suppression, characterized by, It includes: A data acquisition module is used to construct a regulation object candidate set for active power distribution network voltage fluctuation suppression; A data analysis module is used to compare the regulation economy of various regulation objects based on the regulation object candidate set, analyze the regulation response speed and regulation response ability of various regulation objects, and obtain regulation characteristic data of various regulation objects; A model construction module is used to construct differentiated active power distribution network voltage fluctuation suppression regulation models for voltage fluctuations at different time scales, considering the regulation characteristic data of various regulation objects, and solve the target function of the active power distribution network voltage fluctuation suppression regulation model to obtain the regulation strategy for active power distribution network voltage fluctuation suppression. A voltage regulation module is used to control various regulation objects by combining the voltage fluctuation of the active power distribution network and the obtained regulation strategy for active power distribution network voltage fluctuation suppression. A voltage fluctuation suppression module is used to analyze the typical characteristics of voltage fluctuations at different time scales, construct a switching criterion for voltage fluctuations at different time scales, and realize automatic suppression of multi-time-scale voltage fluctuations.

15. An electronic device, comprising: It includes a processor, a memory, and a bus, the memory stores machine readable instructions executable by the processor, when the electronic device is running, the processor and the memory communicate through the bus, the processor executes the machine readable instructions to perform the steps of the method for active power distribution network voltage fluctuation suppression according to any one of claims 1-13.

16. A storage medium, characterized by The storage medium stores a computer program, which is executed by the processor to perform the steps of the method for active power distribution network voltage fluctuation suppression according to any one of claims 1-13.

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