A power grid voltage dynamic regulation and reactive power compensation system

Abstract

The application relates to the technical field of power transmission and distribution regulation, in particular to a power grid voltage dynamic regulation and reactive power compensation system; the system comprises the following: a topological voltage path mapping unit is used for combining a power grid topological structure to construct a disturbance propagation path atlas and generate a propagation path set containing disturbance path features; a disturbance path feature analysis unit is used for dividing the propagation path into stable propagation paths and unstable disturbance paths; a cooperative control window generation unit is used for establishing a dynamic cooperative response window mechanism, authorizing SVG devices and OLTC devices to adjust voltage for reactive power compensation; a response projection conflict suppression unit is used for projecting the reactive power regulation response instructions acting on the multiple SVG devices based on a path propagation direction projection mechanism to perform path propagation direction projection processing and path attribution weight distribution. The application realizes hierarchical authorization and conflict suppression of the reactive power regulation behaviors of the SVG and OLTC devices by constructing a cooperative response control mechanism.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission and distribution regulation, and particularly relates to a power grid voltage dynamic regulation and reactive power compensation system. BACKGROUND

[0002] The dynamic regulation and reactive power compensation of the power grid voltage mainly rely on the on-load tap changer (OLTC) and static var generator (SVG) and other regulating devices; the OLTC has the ability to regulate the voltage in the medium and long term, and is suitable for slowly changing disturbance situations such as voltage level deviation; and the SVG, as a fast response device based on power electronics, is used to suppress short-time fluctuations and provide dynamic reactive power support; in the prior art, multiple SVGs and multiple OLTC nodes are usually deployed in the power grid, and are operated together in combination with the set voltage target issued by the dispatching system to maintain voltage stability; however, due to the lack of unified response coordination boundaries between different types of devices, combined with the non-uniformity and nonlinear dynamic evolution characteristics of voltage disturbance propagation in the power grid topology, the current system still faces great challenges in multi-device collaborative response;

[0003] In specific operation scenarios, when local disturbances such as distributed new energy power fluctuations or sudden load changes occur in the power grid, two types of conflict problems are prone to occur: one is OLTC frequent misoperation, that is, due to the misidentification of short-time disturbance as a steady-state voltage deviation, the OLTC device switches the tap multiple times within a few minutes, causing voltage step changes and inducing regulation oscillation; the other is SVG multi-point overlapping interference, that is, multiple distributed SVG devices respond to the same disturbance path at the same time, causing over-compensation of reactive power, branch backflow and phase interference, further causing local voltage disturbance amplification and unstable reactive power regulation. SUMMARY

[0004] The purpose of the present application is to provide a power grid voltage dynamic regulation and reactive power compensation system to solve the two types of conflict problems proposed in the background art.

[0005] To achieve the above purpose, the purpose of the present application is to provide a power grid voltage dynamic regulation and reactive power compensation system, comprising:

[0006] A topological voltage path mapping unit, the topological voltage path mapping unit is used to collect voltage fluctuation data of each node of the power grid in real time, construct a disturbance propagation path atlas in combination with the power grid topology structure, and generate a propagation path set containing disturbance path characteristics;

[0007] Wherein, the disturbance path characteristics include path start and end nodes, path propagation direction and path length;

[0008] The disturbance path feature analysis unit is configured to calculate time features, topological space features, source features and dynamic trend features of all the propagation paths in the propagation path set, divide each propagation path into a stable propagation path and a non-stable disturbance path, and determine a disturbance attribution type of each propagation path according to a propagation direction of the path and the dynamic trend features;

[0009] The collaborative control window generation unit is configured to establish a dynamic collaborative response window mechanism according to the disturbance path features and the disturbance attribution type, and activate a reactive power regulation response instruction in combination with the propagation direction of the path and the dynamic trend features, so as to authorize the SVG device and the OLTC device to regulate voltage for reactive power compensation.

[0010] The collaborative control window generation unit comprises a collaborative window structure generation module.

[0011] The collaborative window structure generation module is configured to construct the dynamic collaborative response window mechanism based on the stable propagation path and the non-stable disturbance path in combination with the disturbance path features.

[0012] The dynamic collaborative response window mechanism is a regulation response authorization structure, which is configured to authorize a regulation authority range and a target response position of a corresponding propagation path of a different response device.

[0013] Each node in each propagation path that is outside a node voltage fluctuation threshold range is taken as a window path node, which is taken as a target response position. An SVG device node with regulation capability and an OLTC device node with tap control capability on the path are identified. The propagation path nodes and the adjustable device nodes are one-to-one mapped to construct a path-device bidirectional index table, and the dynamic collaborative response window mechanism is obtained.

[0014] The path-device bidirectional index table is a topological mapping relationship between the propagation path set and the adjustable device nodes, which is configured to determine a responseable device involved in the propagation path, and reversely query a propagation path currently authorized to be regulated by a response device.

[0015] The response projection conflict suppression unit is configured to perform projection processing on the reactive power regulation response instruction acting on the plurality of SVG devices according to a path propagation direction projection mechanism, screen a component of a regulation behavior of each SVG device that is consistent with a corresponding path propagation direction of the SVG device, and perform path attribution weight distribution on a regulation amplitude of the SVG device according to a path attribution weight distribution rule at an intersection node where the non-stable disturbance paths intersect.

[0016] In the response projection conflict suppression unit, the path propagation direction projection mechanism is configured to perform directional constraint processing on the reactive power regulation response instruction of the plurality of SVG devices, and the specific method is as follows:

[0017] The SVG device corresponding to each SVG device is taken as a target projection direction, a vector component of the SVG device generated in the path propagation direction is calculated, and the transverse component inconsistent with the path propagation direction in the adjustment behavior is removed, and only the adjustment behavior component consistent with the target path propagation direction is reserved;

[0018] The path attribution weight distribution rule is used to distribute the control attribution proportion of each propagation path to the node when multiple propagation paths act on the same node, and the specific implementation is as follows:

[0019] The shortest topological distance between the intersection node and the starting node of each propagation path is calculated to obtain a distance factor; the average propagation intensity in the propagation process is extracted to obtain a propagation intensity factor; the relative position of the intersection node in the path is counted to obtain a path node proportion factor; the distance factor, the propagation intensity factor, and the path node proportion factor are normalized and weighted to obtain a path attribution weight, and the reactive power regulation amplitude of the SVG device at the intersection node is proportionally distributed according to the attribution weight of each path.

[0020] Preferably, the power grid topology structure is a directed graph structure of the electrical connection relationship of each node in the power grid.

[0021] The disturbance propagation path atlas is used to describe the voltage disturbance propagation along the propagation path and direction between nodes in the power grid topology structure; the disturbance propagation path atlas is constructed, and a propagation path set containing disturbance path features is generated, and the construction method is as follows:

[0022] The voltage change rate of each node is taken as a disturbance excitation input quantity and injected into the power grid topology structure; the edge weight of each power grid topology structure is calculated according to the equivalent impedance coupling relationship between nodes; the power grid topology structure path search algorithm extracts a path sequence with unidirectional propagation and continuous propagation intensity, and the start and end nodes, the path propagation direction, and the path length of each path are labeled as disturbance path features to generate a propagation path set containing disturbance path features.

[0023] Preferably, the disturbance path feature analysis unit includes a path feature extraction module.

[0024] The path feature extraction module is used to calculate the time feature, the topological space feature, the source feature, and the dynamic trend feature of each propagation path in the propagation path set.

[0025] The time characteristic represents a length of a time interval in which the disturbance exists along a path propagation direction on the propagation path; the topological space characteristic represents a number of nodes covered by the propagation path and a position distribution of the nodes in the disturbance propagation path graph; the source characteristic represents a mean square variation intensity of a voltage fluctuation at a starting node of the path; and the dynamic trend characteristic represents an intensity evolution trend in the disturbance propagation process, including three evolution trends of a sustained type, a mutation type, and a reverse propagation type.

[0026] Preferably, the disturbance path characteristic analysis unit further comprises a path stability classification module.

[0027] The path stability classification module is configured to divide the propagation paths into stable propagation paths and unstable disturbance paths according to the time characteristic and the dynamic trend characteristic of each propagation path, and the specific method is as follows:

[0028] The disturbance duration of the propagation path is calculated, and if the disturbance duration is greater than a system preset time stability threshold, the propagation path has time stability; the disturbance evolution trend of the propagation path is analyzed, and if the disturbance evolution trend of the propagation path is of the sustained type, the propagation path has dynamic trend stability; when the propagation path has both time stability and dynamic trend stability, the propagation path is divided into a stable propagation path, otherwise, it is an unstable disturbance path.

[0029] Preferably, the disturbance path characteristic analysis unit further comprises a belonging type judgment module.

[0030] The belonging type judgment module is configured to judge the disturbance belonging type of the propagation path in combination with the path propagation direction and the dynamic trend characteristic.

[0031] The disturbance belonging type includes a load disturbance type, an SVG response disturbance type, and a background noise disturbance type.

[0032] Preferably, the collaborative control window generation unit further comprises an adjustment response activation module.

[0033] The adjustment response activation module is configured to judge whether the adjustable device involved in each propagation path satisfies an adjustment activation condition based on the path propagation direction and the dynamic trend characteristic, and the specific method is as follows:

[0034] When the path propagation direction of the propagation path is a one-way outward expansion trend, and the dynamic trend characteristic is of the mutation type, the propagation path is a transient response trigger type path; if the unstable disturbance path is a transient response trigger type path, a reactive power adjustment response instruction of the SVG device is activated to control the voltage response and the reactive power compensation of the propagation path.

[0035] When the path propagation direction of the propagation path is a long-term deviation trend, and the dynamic trend characteristic is a sustained type, the stable propagation path is marked as a slowly changing adjustment type path; if the stable propagation path is a slowly changing adjustment type path, the OLTC device is activated to perform tap adjustment operation;

[0036] When the dynamic trend characteristic of the propagation path is a reverse propagation type, the SVG device and the OLTC device are not activated.

[0037] Preferably, the cooperative control window generation unit further comprises a response device permission binding module;

[0038] The response device permission binding module is used for binding the adjustment response devices for the stable propagation path and the non-stable disturbance path, and specifically as follows:

[0039] The node set determined as the non-stable disturbance path is mapped to the node list in which the SVG device is deployed, and the SVG device is authorized to perform the instantaneous disturbance response; the node set determined as the stable propagation path is mapped to the transformer node with the OLTC control capability, and the OLTC device is authorized to perform the long-term voltage deviation adjustment.

[0040] Compared with the prior art, the above technical scheme of the present application has the following beneficial technical effects:

[0041] 1. In the present application, the disturbance path characteristics and the dynamic trend characteristics are jointly analyzed to identify the propagation behavior mode and the attribution type of the disturbance in the power grid topology structure, avoid misidentifying the short-time disturbance as the long-term voltage deviation, inhibit the frequent misoperation of the on-load voltage regulating device, and greatly reduce the step oscillation phenomenon;

[0042] 2. In the present application, based on the dynamic cooperative response window mechanism and the path propagation direction projection mechanism, the directionality constraint and the amplitude decoupling of the response behaviors of multiple SVG devices in space are realized, the reactive power overcompensation and the phase conflict problem caused by the multiple-point overlapping response are solved, and the coordination and stability of the reactive power regulation of the power grid are improved. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 A principle block diagram of an embodiment of the present application is provided;

[0044] Mark: 1, topological voltage path mapping unit; 2, disturbance path characteristic analysis unit; 21, path characteristic extraction module; 22, path stability classification module; 23, attribution type judgment module; 3, cooperative control window generation unit; 31, cooperative window structure generation module; 32, adjustment response activation module; 33, response device permission binding module; 4, response projection conflict suppression unit. DETAILED DESCRIPTION

[0045] As Figure 1As shown, a power grid voltage dynamic regulation and reactive power compensation system is provided, comprising a topological voltage path mapping unit 1, a disturbance path feature analysis unit 2, a cooperative control window generation unit 3, and a response projection conflict suppression unit 4.

[0046] The topological voltage path mapping unit 1 is used to collect voltage fluctuation data of each node of the power grid in real time, construct a disturbance propagation path atlas in combination with the power grid topology structure, and generate a propagation path set containing disturbance path features;

[0047] The disturbance path features include path start and end nodes, path propagation direction, and path length.

[0048] In this embodiment, the power grid topology structure is a directed graph structure of electrical connection relationships between nodes in the power grid.

[0049] The disturbance propagation path atlas is used to describe the propagation of voltage disturbances along the paths and directions between nodes in the power grid topology structure. The disturbance propagation path atlas is constructed, and a propagation path set containing disturbance path features is generated, and the construction method is as follows:

[0050] The voltage rate of change of each node is injected into the power grid topology structure as a disturbance excitation input quantity. The edge weight values of each power grid topology structure are calculated according to the equivalent impedance coupling relationship between nodes. The power grid topology structure path search algorithm extracts path sequences with unidirectional propagation and continuous propagation strength, and labels the start and end nodes, path propagation direction, and path length of each path as disturbance path features, and generates a propagation path set containing disturbance path features.

[0051] In this embodiment, a conventional power system state quantity acquisition method is used, and voltage transformers, synchronous phasor measurement devices, and supervisory control and data acquisition systems deployed at key nodes of the power grid are used to collect voltage fluctuation data of each node of the power grid in real time. The synchronous phasor measurement device is used to obtain high-frequency, synchronous node voltage phasor data, which is used to construct the disturbance path direction and propagation trend. At the same time, steady-state data and topology information collected by the supervisory control and data acquisition system are used to support the basic power grid structure and equipment state monitoring.

[0052] The voltage fluctuation data includes a sampling sequence of the change of the node voltage amplitude with time, the node voltage rate of change, the phase angle change information of the region where the node is located, and the local fluctuation amplitude of the voltage within a certain time window, and other basic electrical quantities.

[0053] In the embodiment, the disturbance propagation path atlas is a directed graph structure modeling the electrical connection relationship between nodes of the power grid. Each node in the disturbance propagation path atlas corresponds to a voltage monitoring point in the power grid, and each directed edge represents an electrical propagation path between two nodes. The voltage change rate of each node is taken as the disturbance excitation input, which identifies the disturbance source and the disturbance occurrence direction. According to the equivalent impedance coupling relationship between the nodes of the power grid, the edge weight coefficients of each directed edge in the graph are calculated. The smaller the edge weight value, the stronger the possibility of voltage disturbance propagation on the path. Through a path search algorithm, a path set that satisfies the one-way propagation direction and continuous propagation strength is selected. The start and end nodes, propagation direction, and path length of each path are extracted as disturbance path features for subsequent analysis and response authority division. The one-way propagation direction is from a high disturbance source to a low disturbance diffusion. The continuous propagation strength is that the edge weight values are relatively uniform and have no abrupt changes.

[0054] The disturbance path feature analysis unit 2 is configured to calculate the time feature, topological space feature, source feature, and dynamic trend feature of all the propagation paths in the propagation path set, divide each propagation path into a stable propagation path and a non-stable disturbance path, and determine the disturbance attribution type of each propagation path according to the path propagation direction and dynamic trend feature.

[0055] In the embodiment, the disturbance path feature analysis unit 2 includes a path feature extraction module 21.

[0056] The path feature extraction module 21 is configured to calculate the time feature, topological space feature, source feature, and dynamic trend feature of each propagation path in the propagation path set.

[0057] The time feature represents the time interval length of the disturbance existing along the path propagation direction on the propagation path. The topological space feature represents the number of nodes covered by the propagation path and the position distribution of the nodes in the disturbance propagation path atlas. The source feature represents the mean square variation intensity of the voltage fluctuation at the starting node of the path. The dynamic trend feature represents the intensity evolution trend in the disturbance propagation process, including three evolution trends of the sustained type, the mutation type, and the reverse propagation type.

[0058] In the embodiment, the time feature is used to represent the time interval length of the disturbance existing along the path propagation direction on the propagation path, reflecting the stability and continuity of the disturbance behavior. The topological space feature is used to describe the number of nodes covered by the propagation path and the relative position distribution of the nodes in the entire disturbance propagation path atlas, so as to evaluate the spatial expansion range of the path. The source feature identifies the excitation intensity of the disturbance source by calculating the mean square variation intensity of the voltage fluctuation at the starting node of the path. The dynamic trend feature is used to describe the evolution trend of the disturbance intensity in the propagation process, which is divided into three types of the sustained type, the mutation type, and the reverse propagation type, providing a classification basis for the subsequent response timing and device assignment logic.

[0059] In the embodiment, the dynamic trend feature of the backward propagation type is a very special but actually existing case in the power grid disturbance propagation behavior, which occurs in the following scenarios: the load disturbance affects the upstream backbone in reverse; the power backward injection caused by the asynchronous distributed power supply access; the disturbance backfill phenomenon caused by the error response of the regulating device; for the propagation path with the dynamic trend feature of the backward propagation type, the SVG or OLTC device is not immediately activated, but should enter the response freezing or diagnosis pending state of the system, and whether to allow the adjustment is decided after further confirmation by the system;

[0060] wherein the SVG device is a static var generator, which is a reactive power regulating device based on power electronic converter technology, which quickly realizes the dynamic adjustment of capacitive or inductive reactive power by controlling the current phase and amplitude; the OLTC device is an on-load tap changer, which is a voltage regulating device that can adjust the transformer tap position to change the output voltage level without interrupting the power output.

[0061] In the embodiment, the disturbance path feature analysis unit 2 further comprises a path stability classification module 22.

[0062] The path stability classification module 22 is configured to divide the propagation path into a stable propagation path and a non-stable disturbance path according to the time feature and the dynamic trend feature of each propagation path, and the specific method is as follows:

[0063] Calculate the disturbance duration of the propagation path, if the disturbance duration is greater than the system preset time stability threshold, the propagation path has time stability; analyze the disturbance evolution trend of the propagation path, if the disturbance evolution trend of the propagation path is continuous, the propagation path has dynamic trend stability; when the propagation path has both time stability and dynamic trend stability, the propagation path is divided into a stable propagation path, otherwise it is a non-stable disturbance path.

[0064] In the embodiment, the path stability classification module 22 divides the propagation path into two categories of stable propagation path and unstable disturbance path, so as to determine which path is suitable for being processed by the OLTC device of the response lag type and which path needs to be adjusted in real time by the SVG device of the fast response type; the path stability classification module 22 introduces a joint criterion system of time characteristics and dynamic trend characteristics, wherein the time characteristics are used to identify the existing duration of the disturbance, and the dynamic trend characteristics are used to judge the evolution mode of the disturbance behavior; the combination of the two dimensions can ensure that the adjustment logic of the slow device is triggered only when the disturbance continuously exists on the topology path and the intensity trend is stable; and for those paths with short propagation time, disturbance trend mutation or nonlinear repeated change, the paths are marked as unstable disturbance paths, the adjustment weight is inclined to the SVG, and the OLTC type slow response device is avoided from being triggered by mistake.

[0065] In the embodiment, the disturbance path feature analysis unit 2 further includes a belonging type judgment module 23.

[0066] The belonging type judgment module 23 is used to judge the disturbance belonging type of the propagation path in combination with the path propagation direction and the dynamic trend characteristics.

[0067] The disturbance belonging type includes a load disturbance type, an SVG response disturbance type and a background noise disturbance type.

[0068] In the embodiment, the specific method for judging the disturbance belonging type of the propagation path in combination with the path propagation direction and the dynamic trend characteristics is as follows: if the propagation path is in an uplink structure and the disturbance intensity gradually decays along the path length, the path is classified as the load disturbance type; if the path starting point is an SVG device access point and the disturbance is diverged from the center to the periphery, the path is classified as the SVG response disturbance type; and if the path direction is irregular and the disturbance intensity is discontinuous or has a high-frequency oscillation characteristic, that is, a mutation type evolution trend, the path is classified as the background noise disturbance type.

[0069] The cooperative control window generation unit 3 is used to establish a dynamic cooperative response window mechanism according to the disturbance path feature and the disturbance belonging type, and activate the reactive power adjustment response instruction in combination with the path propagation direction and the dynamic trend characteristics, so as to authorize the SVG device and the OLTC device to adjust the voltage for reactive power compensation.

[0070] In the embodiment, the cooperative control window generation unit 3 includes a cooperative window structure generation module 31.

[0071] The cooperative window structure generation module 31 is used to construct a dynamic cooperative response window mechanism based on the stable propagation path and the unstable disturbance path and in combination with the disturbance path feature.

[0072] The dynamic cooperative response window mechanism is a response authorization structure for adjusting the adjustment authority range of different response devices to their corresponding propagation paths and target response positions.

[0073] Each node in the propagation path that is outside the node voltage fluctuation threshold range is regarded as a window path node as a target response position; SVG device nodes with adjustment capabilities and OLTC device nodes with tapping control capabilities on the path are identified; the propagation path nodes are mapped to the adjustable device nodes one by one to construct a path-device bidirectional index table to obtain the dynamic cooperative response window mechanism.

[0074] The path-device bidirectional index table is a topological mapping relationship between the propagation path set and the adjustable device nodes, which is used to determine the responseable devices involved in the propagation path and reversely query the propagation paths currently authorized to be adjusted by the response device.

[0075] In this embodiment, the dynamic cooperative response window mechanism establishes a one-to-one index relationship between the spatial propagation structure of voltage disturbance, that is, the path node, and the control node of the physical responseable capability, that is, the SVG and OLT device, so that after disturbance identification, instead of directly broadcasting response instructions to all devices, an adjustment authorization interval is generated according to the path attribution and device position; the mapping logic is realized through the path-device bidirectional index table: on the one hand, it can directly locate which response nodes are authorized to participate in adjustment from the disturbance path; on the other hand, it can reversely query the current adjustment target path set allocated from each SVG or OLTC device, so as to realize the reasonable scheduling and mutual exclusion authorization of device adjustment resources in the case of multiple disturbance concurrency.

[0076] In this embodiment, the cooperative control window generation unit 3 further comprises an adjustment response activation module 32.

[0077] The adjustment response activation module 32 is configured to judge whether the adjustable device involved in each propagation path meets the adjustment activation condition based on the path propagation direction and the dynamic trend feature, and the specific method is as follows:

[0078] When the path propagation direction of the propagation path is a one-way outward expansion trend and the dynamic trend feature is a mutation type, the propagation path is a transient response trigger type path; if the non-stable disturbance path is a transient response trigger type path, the reactive power adjustment response instruction of the SVG device is activated to control the voltage response and reactive power compensation of the propagation path.

[0079] When the path propagation direction of the propagation path is a long-term deviation trend and the dynamic trend feature is a sustained type, it is marked as a slow-changing adjustment type path; if the stable propagation path is a slow-changing adjustment type path, the OLTC device is activated to perform a tapping adjustment operation.

[0080] When the dynamic trend characteristic of the propagation path is reverse propagation type, the SVG device and the OLTC device are not activated.

[0081] In the embodiment, the path propagation direction of the propagation path is unidirectional outward expansion trend, and the non-stable disturbance path with the dynamic trend characteristic of mutation type is marked as transient response trigger type path, which is suitable for millisecond-level response performed by power electronic devices such as SVG; the path propagation direction of the propagation path is long-term deviation trend, and the stable propagation path with the dynamic trend characteristic of continuous type is identified as slow-changing regulation type path, which is handed over to the OLTC device for tap operation in the scale of minutes; for the path with the dynamic trend characteristic of reverse propagation type, to prevent regulation misdirection or device intervention disturbance source, the module temporarily freezes the path, and does not trigger any device response.

[0082] In the embodiment, the coordinated control window generation unit 3 further comprises a response device permission binding module 33.

[0083] The response device permission binding module 33 is configured to bind the regulation response devices for the stable propagation path and the non-stable disturbance path, and specifically as follows.

[0084] The node set determined as the non-stable disturbance path is mapped to the node list in which the SVG device is deployed, and the SVG device is authorized to perform transient disturbance response; the node set determined as the stable propagation path is mapped to the transformer node with OLTC control capability, and the OLTC device is authorized to perform long-term voltage deviation regulation.

[0085] In the embodiment, the stability type of the propagation path is taken as the basis for dispatching the regulation permission, and the regulation behavior in the system is limited in the fixed mapping relationship established between the paths and the devices, so that the closed-loop control logic of the regulation response is realized; the node set determined as the non-stable disturbance path is bound to the node list in which the SVG device is deployed, and the non-stable disturbance path has response urgency, short action time scale, and fast disturbance path propagation speed, so that the system preferentially authorizes the fast controllable SVG device to perform millisecond-level transient reactive response; and for the path set marked as the stable propagation path, the path set is mapped to the OLTC device control node for performing voltage deviation regulation in a slow time scale.

[0086] In the embodiment, the device authorization is not fixed mapping, but dynamic adjustment of the device permission according to the change of the disturbance path during the activation of the coordinated response window mechanism, so that the response resources can be reused and the response load can be dynamically balanced in different disturbance periods.

[0087] The response projection conflict suppression unit 4 is used for projecting the reactive regulation response instructions of the plurality of SVG devices in the path propagation direction based on the path propagation direction projection mechanism, screening the component of each SVG device regulation behavior consistent with the corresponding path propagation direction, and distributing the path ownership weight of the SVG device regulation amplitude at the intersection node of each unstable disturbance path intersection according to the path ownership weight distribution rule;

[0088] In the embodiment, the path propagation direction projection mechanism in the response projection conflict suppression unit 4 is used for directional constraint processing of the reactive regulation response instructions of the plurality of SVG devices, specifically as follows:

[0089] The propagation path direction corresponding to each SVG device is taken as the target projection direction, the vector component of the reactive regulation current generated by the SVG device in the path propagation direction is calculated, and the transverse component inconsistent with the path propagation direction in the regulation behavior is removed, and only the regulation behavior component consistent with the target path propagation direction is reserved.

[0090] In the embodiment, the path propagation direction projection mechanism constructs the target projection reference of the SVG regulation behavior based on the propagation direction information of each path in the disturbance path atlas, establishes the propagation direction vector of the path to which each authorized SVG device belongs, takes the vector as the orthogonal projection direction, performs projection calculation on the reactive regulation current vector actually output by the device, extracts the vector component consistent with the path direction, and removes the transverse component in the vertical direction; ensure that the regulation behavior of each SVG device is limited in the effective regulation domain of the bound path, and the cross-path regulation conflict and reactive resource interference are suppressed from the source.

[0091] In the embodiment, the path ownership weight distribution rule is used for distributing the control ownership proportion of each propagation path to the same node when a plurality of propagation paths act on the same node, specifically as follows:

[0092] The shortest topological distance between the intersection node and the starting node of each propagation path is calculated to obtain a distance factor; the average propagation intensity in the propagation process is extracted to obtain a propagation intensity factor; the relative position of the intersection node in the path is counted to obtain a path node proportion factor; the distance factor, the propagation intensity factor and the path node proportion factor are normalized and weighted to obtain the path ownership weight, and the reactive regulation amplitude of the SVG device at the intersection node is proportionally distributed according to the ownership weight of each path.

[0093] In the embodiment, the distance factor is used to depict the shortest topological path length between the cross node and each propagation path starting node, reflecting the geometric proximity of the path source to the cross node; the propagation strength factor evaluates the average voltage disturbance amplitude or propagation gradient of the path in the propagation process, representing the dominance of the disturbance energy on the path; the path node proportion factor calculates the relative sequence ratio of the position of the cross node in the path, used to judge the degree of proximity to the path source or the end; after normalization processing of the above three factors, the weighting synthesis is carried out according to the preset weight coefficient, to generate the ownership weight value of each propagation path at the cross node; according to the ownership weight, the SVG reactive adjustment amplitude of all the dispatches to the cross node is distributed, to ensure that each adjustment component is consistent with the physical attribution of the path it belongs to, so as to realize the decoupling of space conflict suppression and adjustment behavior.

[0094] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A power grid voltage dynamic regulation and reactive power compensation system, characterized by, The application relates to a power grid voltage disturbance collaborative control method, which comprises the following steps: A topological voltage path mapping unit (1) is used to collect voltage fluctuation data of each node of a power grid in real time, to construct a disturbance propagation path atlas in combination with a power grid topological structure, and to generate a propagation path set containing disturbance path features; The disturbance path features include path start and end nodes, path propagation directions and path lengths; A disturbance path feature analysis unit (2) is used to calculate time features, topological space features, source features and dynamic trend features of all the propagation paths in the propagation path set, to divide the propagation paths into stable propagation paths and unstable disturbance paths, and to judge the disturbance attribution types of the propagation paths according to the path propagation directions and the dynamic trend features; A collaborative control window generating unit (3) is used to establish a dynamic collaborative response window mechanism according to the disturbance path features and the disturbance attribution types, and to activate reactive power regulation response instructions in combination with the path propagation directions and the dynamic trend features, so as to authorize SVG devices and OLTC devices to regulate voltage for reactive power compensation; The collaborative control window generating unit (3) comprises a collaborative window structure generating module (31); The collaborative window structure generating module (31) is used to construct a dynamic collaborative response window mechanism based on the stable propagation paths and the unstable disturbance paths and in combination with the disturbance path features; The dynamic collaborative response window mechanism is a regulation response authorization structure, which is used to authorize the regulation permission range and the target response position of different response devices on corresponding propagation paths; the dynamic collaborative response window mechanism is constructed by the following method: The nodes in each propagation path which are out of the node voltage fluctuation threshold range are taken as window path nodes, which are taken as target response positions; SVG device nodes with regulation capacity and OLTC device nodes with tap control capacity on the path are identified; the propagation path nodes and the adjustable device nodes are one-to-one mapped to construct a path-device bidirectional index table, and the dynamic collaborative response window mechanism is obtained; The path-device bidirectional index table is a topological mapping relationship between the propagation path set and the adjustable device nodes, which is used to judge the responseable devices involved in the propagation path, and to reversely query the propagation path currently regulated by the response device; A response projection conflict suppression unit (4) is used to project the reactive power regulation response instructions acting on multiple SVG devices according to a path propagation direction projection mechanism, to screen the components of the regulation behavior of each SVG device which are consistent with the corresponding path propagation direction, and to distribute the regulation amplitude of the SVG devices according to a path attribution weight distribution rule at the intersection nodes of the intersection of the unstable disturbance paths; In the response projection conflict suppression unit (4), the path propagation direction projection mechanism is used to directionally constrain the reactive power regulation response instructions of the multiple SVG devices, and the specific method is as follows: The SVG device corresponding to each SVG device is taken as a target projection direction, a vector component of the SVG device generated in the path propagation direction is calculated, and the transverse component inconsistent with the path propagation direction is removed, and only the SVG device generated in the target path propagation direction is reserved; The path attribution weight distribution rule is used to distribute the control attribution proportion of each propagation path to the same node when multiple propagation paths act on the same node, and the specific method is as follows: The shortest topological distance between the cross node and the starting node of each propagation path is calculated to obtain a distance factor; the average propagation intensity in the propagation process is extracted to obtain a propagation intensity factor; the relative position of the cross node in the path is counted to obtain a path node proportion factor; the distance factor, the propagation intensity factor and the path node proportion factor are normalized and weighted to obtain a path attribution weight, and the SVG device reactive power regulation amplitude at the cross node is proportionally distributed according to the attribution weight of each path.

2. The dynamic regulation of grid voltage and reactive power compensation system of claim 1, wherein, The power grid topology structure is a directed graph structure of the electrical connection relationship of each node in the power grid; The disturbance propagation path atlas is used to describe the voltage disturbance propagation along the propagation path and direction between nodes in the power grid topology structure; the disturbance propagation path atlas is constructed, and a propagation path set containing disturbance path features is generated, and the construction method is as follows: The voltage change rate of each node is taken as a disturbance excitation input quantity injected into the power grid topology structure; the edge weight of each power grid topology structure is calculated according to the equivalent impedance coupling relationship between nodes; the power grid topology structure path search algorithm extracts the path sequence with unidirectional propagation and continuous propagation intensity, and labels the starting and ending nodes, the path propagation direction and the path length of each path as the disturbance path features to generate the propagation path set containing the disturbance path features.

3. The dynamic regulation and reactive power compensation system for power grid voltage according to claim 2, characterized in that, The disturbance path feature analysis unit (2) comprises a path feature extraction module (21); The path feature extraction module (21) is used to calculate the time feature, the topological space feature, the source feature and the dynamic trend feature of each propagation path in the propagation path set; The time feature represents the time interval length of the disturbance existing along the path propagation direction on the propagation path; the topological space feature represents the number of nodes covered by the propagation path and the position distribution of the nodes in the disturbance propagation path atlas; the source feature represents the mean square change intensity of the voltage fluctuation at the starting node of the path; and the dynamic trend feature represents the intensity evolution trend in the disturbance propagation process, including three evolution trends of continuous type, mutation type and reverse propagation type.

4. The dynamic regulation and reactive power compensation system for power grid voltage according to claim 3, characterized in that, The disturbance path feature analysis unit (2) further comprises a path stability classification module (22); The path stability classification module (22) is used to divide the propagation path into a stable propagation path and a non-stable disturbance path according to the time feature and the dynamic trend feature of each propagation path, and the specific method is as follows: The disturbance duration of the propagation path is calculated, and if the disturbance duration is greater than a system preset time stability threshold, the propagation path has time stability; the disturbance evolution trend of the propagation path is analyzed, and if the disturbance evolution trend of the propagation path is continuous, the propagation path has dynamic trend stability. When the propagation path has both time stability and dynamic trend stability, the propagation path is divided into stable propagation path, otherwise, it is unstable disturbance path.

5. The dynamic regulation and reactive power compensation system of a power grid voltage according to claim 4, characterized in that, The disturbance path feature analysis unit (2) further comprises a belonging type judgment module (23); The belonging type judgment module (23) is configured to judge the disturbance belonging type of the propagation path in combination with the path propagation direction and the dynamic trend feature. The disturbance belonging type comprises a load disturbance type, an SVG response disturbance type and a background noise disturbance type.

6. The dynamic regulation and reactive power compensation system of a power grid voltage according to claim 5, characterized in that, The collaborative control window generation unit (3) further comprises an adjustment response activation module (32); The adjustment response activation module (32) is configured to judge whether the adjustable device involved in each propagation path satisfies an adjustment activation condition based on the path propagation direction and the dynamic trend feature, and the adjustment activation condition is as follows: When the path propagation direction of the propagation path is a one-way outward expansion trend, and the dynamic trend feature is a mutation type, the propagation path is a transient response trigger type path. If the unstable disturbance path is a transient response trigger type path, a reactive power adjustment response instruction of the SVG device is activated to control the voltage response and the reactive power compensation of the propagation path. When the path propagation direction of the propagation path is a long-term deviation trend, and the dynamic trend feature is a sustained type, the propagation path is marked as a slow-changing adjustment type path. If the stable propagation path is a slow-changing adjustment type path, the OLTC device is activated to perform a tapping adjustment operation. When the dynamic trend feature of the propagation path is a reverse propagation type, the SVG device and the OLTC device are not activated.

7. The dynamic regulation of grid voltage and reactive power compensation system of claim 6, wherein, The collaborative control window generation unit (3) further comprises a response device permission binding module (33). The response device permission binding module (33) is configured to bind adjustment response devices for the stable propagation path and the unstable disturbance path, and the adjustment response devices are as follows: All node sets judged as unstable disturbance paths are mapped to a node list in which the SVG device is deployed, and the SVG device is authorized to perform transient disturbance response; all node sets judged as stable propagation paths are mapped to transformer nodes with OLTC control capability, and the OLTC device is authorized to perform long-term voltage deviation adjustment.

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