CN117833203A - Power transmission network recovery state characteristic index generation method and system - Google Patents

Abstract

The invention relates to the technical field of power systems, and discloses a method and a system for generating a characteristic index of a recovery state of a power transmission network, wherein the method comprises the following steps: acquiring operation data, operation state and abnormality and alarm data of a power grid in real time; the running state comprises a power failure state and a recoverable state; analyzing the electric islands of the power grid in real time according to the operation data, the operation state and the abnormality and alarm data to obtain operation mode data of each electric island; and calculating the recovery state characteristic indexes of all the electric islands and the power grid based on the operation mode data to obtain the recovery state characteristic indexes of the power grid. The invention fills the blank of lack of basis for evaluating the safety and stability of the power grid in the recovery state.

Description

A method and system for generating characteristic index of power transmission network restoration state

Technical Field

The present invention relates to the technical field of electric power systems, and in particular to a method and system for generating characteristic indicators of a power transmission network restoration state.

Background technique

The purpose of power grid restoration control after a blackout is to quickly, safely, and economically restore power supply and avoid introducing new safety and stability risks. To this end, during the long process from black start to full restoration of the large power grid, it is necessary to conduct an online safety and stability assessment of the restored power grid throughout the entire process to ensure that the restored power grid has a certain level of safety and stability and can withstand the impact caused by restoration operations and other uncertain factors, thereby supporting the smooth progress of the restoration process.

At present, the online safety and stability assessment of power grids under normal working conditions is based on a series of standards and functional specifications for power grid safety and stability analysis and online safety and stability assessment, including the "Guidelines for Power System Safety and Stability". However, these standards and specifications are only for power grids under normal working conditions and are not applicable to power grids in recovery, because the transitional power grids in the recovery process often cannot meet the assessment requirements under normal working conditions.

For example, it is often required that a normally operating power grid can at least withstand the permanent failure of any equipment without losing safety and stability. However, in the early stage of recovery, most power grids are radial topology structures, and the permanent failure of any line will lead to serious consequences of system decoupling. The existing safety and stability assessment procedures are prone to calculation anomalies. Even if the calculation can be completed, the results are not of reference significance to the dispatching and operation personnel. On the other hand, the transitional power grid during the recovery process needs to have a certain level of safety and stability to ensure the smooth progress of the recovery process.

At present, there are no guiding principles or basis for online safety and stability assessment of transitional power grids in a recovery state at home and abroad. Therefore, the present invention aims to propose a characteristic indicator system of transitional power grids that conforms to the characteristics of the entire recovery process and its quantitative assessment method, so as to provide strong support for further construction of a safety and stability assessment method for the entire process of the recovery power grid.

Summary of the invention

The embodiments of the present invention provide a method and system for generating characteristic indicators of a power transmission network restoration state, so as to solve the above-mentioned technical problems in the prior art.

In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be a general review, nor is it intended to identify key/important components or to delineate the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

According to a first aspect of an embodiment of the present invention, a method for generating a characteristic indicator of a power transmission network restoration state is provided.

In one embodiment, the method for generating a characteristic indicator of a power transmission network restoration state includes:

Acquire the operation data, operation status, abnormality and alarm data of the power grid in real time; the operation status includes power outage status and recoverable status;

Analyze the electrical islands of the power grid in real time according to the operating data, the operating status and the abnormality and alarm data to obtain operating mode data of each electrical island;

Based on the operation mode data, the recovery state characteristic index of each electrical island and the entire power grid is calculated to obtain the transmission network recovery state characteristic index;

Among them, the recovery status characteristic indicators include: electrical island topology characteristic indicators, electrical island grid-connected hydropower and thermal power fluctuation balancing characteristic indicators, electrical island grid-connected new energy power generation fluctuation balancing characteristic indicators, electrical island DC system recovery status indicators, electrical island safety and stability control device recovery characteristic indicators and recovery completeness indicators of the entire network and power supply area.

In one embodiment, according to the operation data, the operation status and the abnormality and alarm data, the electrical islands of the power grid are analyzed in real time to obtain the operation mode data of each electrical island, including:

Perform topological connectivity analysis based on real-time grid operation data, identify a connected network consisting of several connected primary devices as an electrical island, and calculate the total number of electrical islands in the entire grid;

For each electrical island, generating real-time operation mode data thereof according to the operation data, the operation status and the abnormality and alarm data;

The operation mode data include: power flow data for power flow calculation of each electrical island, equipment dynamic parameters for various types of dynamic and transient stability calculations of each electrical island, and sequence network data for short-circuit current calculation of each electrical island.

In one embodiment, based on the operating mode data, calculating the electrical island topology characteristic index of each electrical island includes: determining the power plants and substations that are not completely stopped in the electrical island based on the operating mode data; uniformly regarding the power plants and substations that are not completely stopped in the electrical island as nodes, and the lines in normal operating state as undirected edges between nodes, and if there are multiple edges between adjacent nodes, they are regarded as different edges; searching for all paths between any two nodes in the electrical island; if there is only one path between any two nodes in the electrical island, the radial network index of the electrical island is yes, and the corresponding value is 1, otherwise the radial network index of the electrical island is no, and the value is 0; if there are more than one path between any two nodes in the electrical island, the multi-circuit loop index of the electrical island is yes, and the value is 1, otherwise the multi-circuit loop index of the electrical island is no, and the value is 0, if the value is 1.

In one embodiment, based on the operating mode data, calculating the electrical island grid-connected water-thermal power fluctuation balancing characteristic index of each electrical island includes: calculating the positive standby power of each electrical island and the output upper limit of the largest single power source according to the operating mode data; if the positive standby power of the electrical island is greater than the output upper limit of the largest single power source in the electrical island, then the electrical island grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power can be balanced, and the value is 1; otherwise, the electrical island grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power cannot be balanced, and the value is 0.

In one embodiment, based on the operating mode data, calculating the balancing characteristic index of the grid-connected new energy power generation fluctuation of each electrical island includes: according to the operating mode data, respectively counting the new energy output and rotating reserve of each electrical island; if the positive rotating reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, and the negative rotating reserve of the electrical island is greater than or equal to the maximum upward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0; if wind and solar power abandonment is allowed, and the positive rotating reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0.

In one embodiment, based on the operating mode data, calculating the electrical island DC system recovery state index of each electrical island includes: judging the state of the DC system of the electrical island according to the operating mode data; if the DC system state of the electrical island is bipolar operation, the electrical island DC system recovery state index is the ratio of the bipolar line transmission power to the rated transmission power of the DC system, and the value is 2; if the DC system state of the electrical island is in operation and unipolar operation, the electrical island DC system recovery state index is twice the ratio of the line transmission power to the rated transmission power of the DC system, and the value is 1.

In one embodiment, based on the operating mode data, calculating the recovery characteristic index of the electrical island safety and stability control device of each electrical island includes: judging the emergency control system state and the low-frequency and low-voltage load reduction device state of the electrical island according to the operating mode data; if the emergency control system state of the electrical island is in operation and the emergency control system has no abnormality or alarm information, then the recovery characteristic index of the electrical island safety and stability control device is recovered, and the value is 1; otherwise, the recovery characteristic index of the electrical island safety and stability control device is not recovered, and the value is 0; if the low-frequency and low-voltage load reduction device state of the electrical island is in operation and the low-frequency and low-voltage load reduction device has no abnormality or alarm information, then the recovery characteristic index of the electrical island safety and stability control device is recovered, and the value is 1; otherwise, the recovery characteristic index of the electrical island safety and stability control device is not recovered, and the value is 0.

In one embodiment, based on the operation mode data, calculating the recovery completeness index of the whole network and the power supply area includes: judging the equipment operation status of each station and the line status of each power supply area according to the operation mode data; if, except for the primary equipment and safety and stability control devices in the station that are planned to be shut down and in standby state under normal conditions, other primary equipment and safety and stability control devices have resumed normal operation, and all loads have been restored, then the recovery completeness index of the whole network is fully recovered, and the value is 2; if the primary equipment and safety and stability control devices in the station are all in a shutdown state, the station is in a full stop state, and the recovery completeness index of the whole network is a full stop state, and the value is 0; if the primary equipment and safety and stability control devices in the station are all in a partially recovered state, then the recovery completeness index of the whole network is partially recovered, and the value is 0;

If all the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas have been restored, except for the lines that are planned to be shut down and the lines that are standby under normal operating conditions, the power supply partition recovery completeness index is fully restored, and the value is 2; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are all in an outage state, the power supply partition recovery completeness index is 0; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are partially restored, the power supply partition recovery completeness index is partially restored, and the value is 1.

According to a second aspect of an embodiment of the present invention, a system for generating characteristic indicators of a power transmission network restoration state is provided.

In one embodiment, the transmission network restoration state characteristic indicator generation system includes:

A data acquisition module is used to acquire the operation data, operation status, and abnormal and alarm data of the power grid in real time; the operation status includes a power outage state and a recoverable state;

A data analysis module, configured to analyze the electrical islands of the power grid in real time according to the operation data, the operation status and the abnormality and alarm data, and obtain operation mode data of each electrical island;

A characteristic index calculation module, used to calculate the recovery state characteristic index of each electrical island and the entire power grid based on the operation mode data, and obtain the transmission network recovery state characteristic index;

Among them, the recovery status characteristic indicators include: electrical island topology characteristic indicators, electrical island grid-connected hydropower and thermal power fluctuation balancing characteristic indicators, electrical island grid-connected new energy power generation fluctuation balancing characteristic indicators, electrical island DC system recovery status indicators, electrical island safety and stability control device recovery characteristic indicators and recovery completeness indicators of the entire network and power supply area.

In one embodiment, when the data analysis module analyzes the electrical islands of the power grid in real time according to the operation data, the operation status and the abnormality and alarm data to obtain the operation mode data of each electrical island, the data analysis module performs topological connectivity analysis according to the real-time operation data of the power grid, identifies a connected network composed of a number of connected primary devices as an electrical island, and calculates the total number of electrical islands in the entire power grid; for each electrical island, generates its real-time operation mode data according to the operation data, the operation status and the abnormality and alarm data;

The operation mode data include: power flow data for power flow calculation of each electrical island, equipment dynamic parameters for various types of dynamic and transient stability calculations of each electrical island, and sequence network data for short-circuit current calculation of each electrical island.

In one embodiment, when the characteristic index calculation module calculates the electrical island topology characteristic index of each electrical island based on the operating mode data, the power plant and substation that are not completely stopped in the electrical island are determined based on the operating mode data; the power plant and substation that are not completely stopped in the electrical island are uniformly regarded as nodes, and the lines in normal operating state are regarded as undirected edges between nodes. If there are multiple edges between adjacent nodes, they are regarded as different edges; all paths between any two nodes in the electrical island are searched; if there is only one path between any two nodes in the electrical island, the radial network index of the electrical island is yes, and the corresponding value is 1, otherwise the radial network index of the electrical island is no, and the value is 0; if there is more than one path between any two nodes in the electrical island, the multi-circuit loop index of the electrical island is yes, and the value is 1, otherwise the multi-circuit loop index of the electrical island is no, and the value is 0, if the value is 1.

In one embodiment, when the characteristic index calculation module calculates the electrical island grid-connected water-thermal power fluctuation balancing characteristic index of each electrical island based on the operating mode data, the positive standby power of each electrical island and the output upper limit of the largest single power source are calculated according to the operating mode data; if the positive standby power of the electrical island is greater than the output upper limit of the largest single power source in the electrical island, then the electrical island grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power can be balanced, and the value is 1; otherwise, the electrical island grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power cannot be balanced, and the value is 0.

In one embodiment, when the characteristic index calculation module calculates the balancing characteristic index of the grid-connected new energy power generation fluctuation of each electrical island based on the operating mode data, the new energy output and rotating reserve of each electrical island are respectively counted according to the operating mode data; if the positive rotating reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, and the negative rotating reserve of the electrical island is greater than or equal to the maximum upward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0; if wind and solar power abandonment is allowed, and the positive rotating reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0.

In one embodiment, when the characteristic index calculation module calculates the electrical island DC system recovery status index of each electrical island based on the operating mode data, the state of the DC system of the electrical island is judged according to the operating mode data; if the DC system state of the electrical island is bipolar operation, the electrical island DC system recovery status index is the ratio of the bipolar line transmission power to the rated transmission power of the DC system, and the value is 2; if the DC system state of the electrical island is in operation and unipolar operation, the electrical island DC system recovery status index is twice the ratio of the line transmission power to the rated transmission power of the DC system, and the value is 1.

In one embodiment, when the characteristic index calculation module calculates the electrical island safety and stability control device recovery characteristic index of each electrical island based on the operating mode data, the emergency control system state and the low-frequency and low-voltage load reduction device state of the electrical island are judged according to the operating mode data; if the emergency control system state of the electrical island is in operation and the emergency control system has no abnormality or alarm information, then the electrical island safety and stability control device recovery characteristic index is recovered, and the value is 1; otherwise, the electrical island safety and stability control device recovery characteristic index is not recovered, and the value is 0; if the low-frequency and low-voltage load reduction device state of the electrical island is in operation and the low-frequency and low-voltage load reduction device has no abnormality or alarm information, then the electrical island safety and stability control device recovery characteristic index is recovered, and the value is 1; otherwise, the electrical island safety and stability control device recovery characteristic index is not recovered, and the value is 0.

In one embodiment, when the characteristic index calculation module calculates the recovery completeness index of the entire network and the power supply area based on the operation mode data, the equipment operation status of each station and the line status of each power supply area are judged according to the operation mode data; if, except for the primary equipment and safety and stability control devices in the station that are planned to be shut down and in standby state under normal conditions, other primary equipment and safety and stability control devices have resumed normal operation and all loads have been restored, then the recovery completeness index of the entire network is fully recovered, and the value is 2; if the primary equipment and safety and stability control devices in the station are all in a shutdown state, the station is in a full stop state, and the recovery completeness index of the entire network is a full stop state, and the value is 0; if the primary equipment and safety and stability control devices in the station are all in a partially recovered state, then the recovery completeness index of the entire network is partially recovered, and the value is 0;

If all the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas have been restored, except for the lines that are planned to be shut down and the lines that are standby under normal operating conditions, the power supply partition recovery completeness index is fully restored, and the value is 2; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are all in an outage state, the power supply partition recovery completeness index is 0; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are partially restored, the power supply partition recovery completeness index is partially restored, and the value is 1.

The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

The present invention is based on the typical intermediate state experienced by a large power grid during the entire process from complete shutdown to complete recovery, and extracts characteristic indicators from different dimensions of power grid recovery and operation, such as topological characteristics, electrical island scale, backup level, new energy grid-connected capacity, degree of recovery of security and control devices, degree of recovery of DC systems, etc. For the first time, an indicator system for quantitatively characterizing the characteristics of the power grid in a recovery state is established, and a calculation method is proposed, which fills the gap of the lack of basis for safety and stability assessment of the power grid in a recovery state, and provides strong support for the subsequent construction of a safety and stability assessment method for the entire process of the power grid in a recovery state, so that a reliable safety and stability assessment of the entire process of the power grid recovery state can be finally carried out, which significantly improves the safety and stability level of the power grid in a recovery state and ensures the smooth progress of the recovery process.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

FIG1 is a flow chart of a method for generating a characteristic index of a power transmission network restoration state according to an exemplary embodiment;

FIG2 is a structural block diagram of a system for generating characteristic indicators of a power transmission network restoration state according to an exemplary embodiment;

Fig. 3 is a schematic diagram showing the structure of a computer device according to an exemplary embodiment.

Detailed ways

The following description and accompanying drawings fully illustrate the specific embodiments of this article so that those skilled in the art can practice them. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. The scope of the embodiments of this article includes the entire scope of the claims, as well as all available equivalents of the claims. Herein, the terms "first", "second", etc. are only used to distinguish one element from another, without requiring or implying any actual relationship or order between these elements. In fact, the first element can also be called the second element, and vice versa. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the structure, device or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such structure, device or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the structure, device or equipment including the elements. Each embodiment is described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

The terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this document and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description herein, unless otherwise specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two elements, it can be a direct connection, or it can be an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

As used herein, unless otherwise specified, the term "plurality" means two or more than two.

In this document, the character "/" indicates that the preceding and following objects are in an "or" relationship. For example, A/B means: A or B.

In this article, the term "and/or" is a description of the association relationship between objects, indicating that three relationships may exist. For example, A and/or B means: A or B, or, A and B.

It should be understood that, although the various steps in the flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the figure may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

Each module in the device or system of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above modules.

In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

FIG1 shows an embodiment of a method for generating characteristic indicators of a power transmission network restoration state according to the present invention.

In this optional embodiment, the method for generating a characteristic index of a power transmission network restoration state includes:

Step S101, acquiring the operation data, operation status, and abnormal and alarm data of the power grid in real time; the operation status includes a power outage state and a recoverable state;

Step S103, analyzing the electrical islands of the power grid in real time according to the operating data, the operating status, and the abnormality and alarm data, to obtain operating mode data of each electrical island;

Step S105, based on the operation mode data, calculating the recovery state characteristic index of each electrical island and the entire power grid to obtain the transmission network recovery state characteristic index;

Among them, the recovery status characteristic indicators include: electrical island topology characteristic indicators, electrical island grid-connected hydropower and thermal power fluctuation balancing characteristic indicators, electrical island grid-connected new energy power generation fluctuation balancing characteristic indicators, electrical island DC system recovery status indicators, electrical island safety and stability control device recovery characteristic indicators and recovery completeness indicators of the entire network and power supply area.

FIG2 shows an embodiment of a system for generating characteristic indicators of a power transmission network restoration state according to the present invention.

In this optional embodiment, the transmission network restoration state characteristic index generation system includes:

The data acquisition module 201 is used to acquire the operation data, operation status, abnormality and alarm data of the power grid in real time; the operation status includes a power outage state and a recoverable state;

A data analysis module 203, configured to analyze the electrical islands of the power grid in real time according to the operation data, the operation status and the abnormality and alarm data, and obtain operation mode data of each electrical island;

The characteristic index calculation module 205 is used to calculate the recovery state characteristic index of each electrical island and the entire power grid based on the operation mode data to obtain the transmission network recovery state characteristic index;

Among them, the recovery status characteristic indicators include: electrical island topology characteristic indicators, electrical island grid-connected hydropower and thermal power fluctuation balancing characteristic indicators, electrical island grid-connected new energy power generation fluctuation balancing characteristic indicators, electrical island DC system recovery status indicators, electrical island safety and stability control device recovery characteristic indicators and recovery completeness indicators of the entire network and power supply area.

In specific applications, the electrical island refers to a power grid of any size that is connected and provides continuous and stable power supply, including active power sources, reactive power sources, loads, and power transmission and transformation equipment in a number of operating states. When the electrical islands of the power grid are analyzed in real time based on the operating data, the operating state, and the abnormal and alarm data to obtain the operating mode data of each electrical island, a topological connectivity analysis can be performed based on the real-time operating data of the power grid, and a connected network composed of a number of connected primary devices can be identified as an electrical island, and the total number of electrical islands in the entire power grid can be calculated; for each electrical island, its real-time operating mode data can be generated based on the operating data, the operating state, and the abnormal and alarm data;

The operation mode data include: power flow data for power flow calculation of each electrical island, equipment dynamic parameters for various types of dynamic and transient stability calculations of each electrical island, and sequence network data for short-circuit current calculation of each electrical island.

When calculating the electrical island topology characteristic index of each electrical island based on the operating mode data, the power plants and substations that are not completely stopped in the electrical island can be determined based on the operating mode data; the power plants and substations that are not completely stopped in the electrical island are uniformly regarded as nodes, and the lines in normal operating state are regarded as undirected edges between nodes. If there are multiple edges between adjacent nodes, they are regarded as different edges; all paths between any two nodes in the electrical island are searched; if there is only one path between any two nodes in the electrical island, the radial network index of the electrical island is yes, and the corresponding value is 1, otherwise the radial network index of the electrical island is no, and the value is 0; if there are more than one path between any two nodes in the electrical island, the multi-circuit loop index of the electrical island is yes, and the value is 1, otherwise the multi-circuit loop index of the electrical island is no, and the value is 0, if the value is 1.

When calculating the balancing characteristic index of grid-connected water-fired power fluctuations of each electrical island based on the operating mode data, the positive standby power of each electrical island and the upper limit of the output of the largest single power source can be calculated according to the operating mode data; if the positive standby power of the electrical island is greater than the upper limit of the output of the largest single power source in the electrical island, then the balancing characteristic index of grid-connected water-fired power fluctuations of the electrical island is that water-fired power can be balanced, and the value is 1; otherwise, the balancing characteristic index of grid-connected water-fired power fluctuations of the electrical island is that water-fired power cannot be balanced, and the value is 0.

Among them, the calculation formula for the maximum value of the upward and downward fluctuations of the new energy output of each electrical island is:

In the formula, are the maximum upward and downward fluctuations of the renewable energy power generation output of the electrical island _Gi , respectively. If the calculated value is negative, it is taken as 0; Nne _, ⁱ is the total number of renewable energy in the electrical island _Gi ;/> are the current output value and ultra-short-term forecast value of the j-th new energy power station in the electrical island _Gi , respectively. They are respectively the maximum positive and negative absolute values of the deviation between the predicted value of the new energy power station and the actual value, which are obtained based on the statistical analysis of the historical data of the output prediction deviation of the new energy station.

Among them, the calculation formula for positive and negative spinning reserves of each electrical island is:

In the formula, are respectively the positive and negative spinning reserves of electrical island _Gi ,/> The total number of positive and negative spinning reserve power sources that can be provided by the electrical island, respectively. The types of power sources that can provide spinning reserve include but are not limited to hydro/thermal power units, energy storage power stations, interconnection lines that can adjust or remove loads downward, can improve power input plans, and new energy power stations in power-limited states;/> They are the output upper limit, current output and minimum output of power source j respectively.

When calculating the balancing characteristic index of the grid-connected new energy power generation fluctuation of each electrical island based on the operating mode data, the new energy output and rotating reserve of each electrical island can be respectively counted according to the operating mode data; if the positive rotating reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, and the negative rotating reserve of the electrical island is greater than or equal to the maximum upward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0; if wind and solar power abandonment is allowed, and the positive rotating reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0.

When calculating the electrical island DC system recovery status index of each electrical island based on the operating mode data, the status of the DC system of the electrical island can be judged according to the operating mode data; if the DC system status of the electrical island is bipolar operation, the electrical island DC system recovery status index is the ratio of the bipolar line transmission power to the rated transmission power of the DC system, and the value is 2; if the DC system status of the electrical island is in operation and unipolar operation, the electrical island DC system recovery status index is twice the ratio of the line transmission power to the rated transmission power of the DC system, and the value is 1.

When calculating the recovery characteristic index of the electrical island safety and stability control device of each electrical island based on the operating mode data, the emergency control system status and the low-frequency and low-voltage load reduction device status of the electrical island can be judged according to the operating mode data; if the emergency control system status of the electrical island is in operation and the emergency control system has no abnormality or alarm information, then the recovery characteristic index of the electrical island safety and stability control device is recovered, and the value is 1; otherwise, the recovery characteristic index of the electrical island safety and stability control device is not recovered, and the value is 0; if the low-frequency and low-voltage load reduction device status of the electrical island is in operation and the low-frequency and low-voltage load reduction device has no abnormality or alarm information, then the recovery characteristic index of the electrical island safety and stability control device is recovered, and the value is 1; otherwise, the recovery characteristic index of the electrical island safety and stability control device is not recovered, and the value is 0.

Among them, the calculation formula for the recovery index of the low-frequency and low-voltage load reduction device is:

In the formula, UFUVL _i is the recovery index of the cuttable capacity of the low-frequency and low-voltage load reduction device; N ^f _v, ⁱ is the number of low-frequency and low-voltage load reduction devices currently restored in the electrical island _Gi . For the conventional AB set configuration, it is regarded as 1 set; P _c ^l _{, j} is the current cuttable load of the jth device.

Among them, the calculation formula for the proportion index and relative proportion index of the low-frequency and low-voltage load shedding recovery is:

In the formula, UFUVP _i is the proportion index of the recovery of the low-frequency and low-voltage load shedding; UFUVP _i ' is the relative proportion index of the recovery of the low-frequency and low-voltage load shedding; N _fv, ⁱ is the number of low-frequency and low-voltage load shedding devices currently restored in the electrical island _Gi ; P _c ^l,j is the current cuttable load of the jth device; P ^Σ,L,i is the total load currently restored in the electrical island _Gi , which is obtained from the real-time operation data of the power grid; P _c ^l,Σ,0,i is the average cuttable load of the low-frequency and low-voltage load shedding devices installed in the stations in the electrical island _Gi under normal operating conditions; P ^Σ,0,L,i is the average total load of the stations in the electrical island _Gi under normal operating conditions.

When calculating the recovery completeness index of the entire network and the power supply area based on the operating mode data, the equipment operating status of each station and the line status of each power supply area can be judged according to the operating mode data; if, except for the primary equipment and safety and stability control devices that are planned to be shut down and in standby state under normal operating conditions in the station, other primary equipment and safety and stability control devices have resumed normal operation and all loads have been restored, then the recovery completeness index of the entire network is full recovery, and the value is 2; if the primary equipment and safety and stability control devices in the station are all in a shutdown state, the station is in a completely stopped state, and the recovery completeness index of the entire network is partial recovery, and the value is 0; in other cases, the station is partially recovered, and the recovery completeness index of the entire network is partial recovery, and the value is 1.

At this time, the equipment type, AC/DC type, voltage level of the equipment that can be restored in the station are classified and counted, and their proportion in the same type of equipment in the station; the equipment type, AC/DC type, voltage level of the equipment that is unplanned and unrestored in the station are classified and counted; the power supply partition refers to the division of the entire network into several independent monitored and balanced power supply ranges under normal operation of the transmission network, which is a collection of several stations, equipment and lines; when the entire network is restored to a fully connected state, the power supply partition is within the entire network; when the entire network has not been restored to a fully connected state, that is, when there are still electrical islands, the power supply partition may be within a certain electrical island; the equipment types include but are not limited to generator sets, energy storage units, transformers, busbars, switches.

If all the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas have been restored, except for the lines that are planned to be shut down and the lines that are standby under normal operating conditions, the power supply partition recovery completeness index is fully restored, and the value is 2; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are all in an outage state, the power supply partition recovery completeness index is 0; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are partially restored, the power supply partition recovery completeness index is partially restored, and the value is 1.

At this time, the AC/DC types, voltage levels, whether they are within the zone, whether they are interconnected lines, and their proportion in the lines that can be restored after shutdown are classified and counted; the AC/DC types, voltage levels, whether they are within the zone, whether they are interconnected lines, and their proportion in the lines that can be restored after shutdown are counted as well.

FIG3 shows an embodiment of a computer device of the present invention. The computer device may be a server, and the computer device includes a processor, a memory, and a network interface connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store static information and dynamic information data. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, the steps in the above method embodiment are implemented.

Those skilled in the art will understand that the structure shown in FIG. 3 is merely a block diagram of a partial structure related to the solution of the present invention, and does not constitute a limitation on the computer device to which the solution of the present invention is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

In addition, the present invention also provides a computer device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiment when executing the computer program.

In addition, the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiment are implemented.

Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided by the present invention can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

The present invention is not limited to the structures which have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims (16)

1. A method for generating characteristic indicators of power transmission network restoration status, characterized by comprising: Acquire the operation data, operation status, abnormality and alarm data of the power grid in real time; the operation status includes power outage status and recoverable status; Analyze the electrical islands of the power grid in real time according to the operating data, the operating status and the abnormality and alarm data to obtain operating mode data of each electrical island; Based on the operation mode data, the recovery state characteristic index of each electrical island and the entire power grid is calculated to obtain the transmission network recovery state characteristic index; Among them, the recovery status characteristic indicators include: electrical island topology characteristic indicators, electrical island grid-connected hydropower and thermal power fluctuation balancing characteristic indicators, electrical island grid-connected new energy power generation fluctuation balancing characteristic indicators, electrical island DC system recovery status indicators, electrical island safety and stability control device recovery characteristic indicators and recovery completeness indicators of the entire network and power supply area. 2. The method for generating characteristic indicators of the power transmission network restoration state according to claim 1 is characterized in that, according to the operation data, the operation state and the abnormality and alarm data, the electrical islands of the power grid are analyzed in real time to obtain the operation mode data of each electrical island, including: Perform topological connectivity analysis based on real-time grid operation data, identify a connected network consisting of several connected primary devices as an electrical island, and calculate the total number of electrical islands in the entire grid; For each electrical island, generating real-time operation mode data thereof according to the operation data, the operation status and the abnormality and alarm data; The operation mode data include: power flow data for power flow calculation of each electrical island, equipment dynamic parameters for various types of dynamic and transient stability calculations of each electrical island, and sequence network data for short-circuit current calculation of each electrical island. 3. The method for generating characteristic indexes of power transmission network restoration status according to claim 2, characterized in that, based on the operation mode data, calculating the electrical island topology characteristic index of each electrical island comprises: Determining the power plants and substations that are not completely shut down in the electrical island based on the operation mode data; The power plants and substations that are not completely shut down in the electrical island are uniformly regarded as nodes, and the lines in normal operation are regarded as undirected edges between nodes. If there are multiple edges between adjacent nodes, they are regarded as different edges. Search all paths between any two nodes in the electrical island; If there is only one path between any two nodes in the electrical island, the radial network index of the electrical island is yes, and the corresponding value is 1; otherwise, the radial network index of the electrical island is no, and the value is 0; If there is more than one path between any two nodes in the electrical island, then the multi-circuit loop index of the electrical island is yes and the value is 1, otherwise the multi-circuit loop index of the electrical island is no and the value is 0, if the value is 1. 4. The method for generating characteristic indexes of power transmission network restoration state according to claim 2, characterized in that, based on the operation mode data, calculating the characteristic index of grid-connected hydro-thermal power fluctuation balancing of each electrical island comprises: According to the operating mode data, the positive standby power of each electrical island and the upper limit of the output of the largest single power source are calculated; if the positive standby power of the electrical island is greater than the upper limit of the output of the largest single power source in the electrical island, then the electrical island's grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power is balancing, and the value is 1; otherwise, the electrical island's grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power is unbalanced, and the value is 0. 5. The method for generating characteristic indexes of power transmission network restoration state according to claim 2, characterized in that, based on the operation mode data, calculating the characteristic index of power grid-connected new energy power generation fluctuation balancing of each power island comprises: According to the operation mode data, the new energy output and spinning reserve of each electrical island are counted respectively; If the positive spinning reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, and the negative spinning reserve of the electrical island is greater than or equal to the maximum upward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalancing new energy fluctuation, and the value is 0; If wind and solar power abandonment is allowed, and the positive spinning reserve of the electrical island is greater than or equal to the maximum downward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalancing new energy fluctuation, and the value is 0. 6. The method for generating characteristic indicators of power transmission network restoration state according to claim 2, characterized in that, based on the operation mode data, calculating the restoration state indicator of the electrical island DC system of each electrical island comprises: Determining the state of the DC system of the electrical island according to the operation mode data; If the DC system state of the electrical island is bipolar operation, the DC system recovery state index of the electrical island is the ratio of the bipolar line transmission power to the rated transmission power of the DC system, and the value is 2; If the DC system status of the electrical island is in operation and unipolar operation, the DC system recovery status index of the electrical island is twice the ratio of the line transmission power to the rated transmission power of the DC system, and the value is 1. 7. The method for generating a characteristic index of a power transmission network restoration state according to claim 2, wherein, based on the operation mode data, calculating the restoration characteristic index of the electrical island safety and stability control device of each electrical island comprises: According to the operation mode data, determining the state of the emergency control system and the state of the low-frequency and low-voltage load reduction device of the electrical island; If the emergency control system of the electrical island is in operation and there is no abnormality or alarm information in the emergency control system, the electrical island safety and stability control device recovery characteristic index is recovered, and the value is 1; otherwise, the electrical island safety and stability control device recovery characteristic index is not recovered, and the value is 0; If the low-frequency and low-voltage load reduction device of the electrical island is in operation and there is no abnormality or alarm information about the low-frequency and low-voltage load reduction device, the recovery characteristic index of the electrical island safety and stability control device is recovered, and the value is 1; otherwise, the recovery characteristic index of the electrical island safety and stability control device is not recovered, and the value is 0. 8. The method for generating characteristic indicators of power transmission network restoration status according to claim 2, characterized in that, based on the operation mode data, calculating the restoration integrity indicators of the entire network and the power supply area comprises: According to the operation mode data, the equipment operation status of each station and the line status of each power supply area are determined; If, except for the primary equipment and safety and stability control devices in the planned shutdown and standby state under normal operating conditions in the station, other primary equipment and safety and stability control devices have resumed normal operation and all loads have been restored, the whole network recovery completeness index is fully recovered, and the value is 2; if the primary equipment and safety and stability control devices in the station are all in shutdown state, the station is in a full stop state, and the whole network recovery completeness index is a full stop state, and the value is 0; if the primary equipment and safety and stability control devices in the station are all in a partially recovered state, the whole network recovery completeness index is partially recovered, and the value is 0; If all the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas have been restored, except for the lines that are planned to be shut down and the lines that are standby under normal operating conditions, the power supply zone recovery completeness index is fully restored, and the value is 2; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are all in an outage state, the power supply zone recovery completeness index is 0; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are partially restored, the power supply zone recovery completeness index is partially restored, and the value is 1. 9. A system for generating characteristic indicators of power transmission network restoration status, characterized by comprising: A data acquisition module is used to acquire the operation data, operation status, and abnormal and alarm data of the power grid in real time; the operation status includes a power outage state and a recoverable state; A data analysis module, configured to analyze the electrical islands of the power grid in real time according to the operation data, the operation status and the abnormality and alarm data, and obtain operation mode data of each electrical island; A characteristic index calculation module, used to calculate the recovery state characteristic index of each electrical island and the entire power grid based on the operation mode data, and obtain the transmission network recovery state characteristic index; Among them, the recovery status characteristic indicators include: electrical island topology characteristic indicators, electrical island grid-connected hydropower and thermal power fluctuation balancing characteristic indicators, electrical island grid-connected new energy power generation fluctuation balancing characteristic indicators, electrical island DC system recovery status indicators, electrical island safety and stability control device recovery characteristic indicators and recovery completeness indicators of the entire network and power supply area. 10. The transmission network recovery state characteristic index generation system according to claim 9 is characterized in that, when the data analysis module analyzes the electrical islands of the power grid in real time according to the operation data, the operation state and the abnormality and alarm data to obtain the operation mode data of each electrical island, it performs topological connectivity analysis according to the real-time operation data of the power grid, identifies a connected network composed of several connected primary devices as an electrical island, and calculates the total number of electrical islands in the entire power grid; for each electrical island, generates its real-time operation mode data according to the operation data, the operation state and the abnormality and alarm data; The operation mode data include: power flow data for power flow calculation of each electrical island, equipment dynamic parameters for various types of dynamic and transient stability calculations of each electrical island, and sequence network data for short-circuit current calculation of each electrical island. 11. The transmission network recovery state characteristic index generation system according to claim 10 is characterized in that, when the characteristic index calculation module calculates the electrical island topology characteristic index of each electrical island based on the operating mode data, the power plants and substations that are not completely stopped in the electrical island are determined based on the operating mode data; the power plants and substations that are not completely stopped in the electrical island are uniformly regarded as nodes, and the lines in normal operating state are regarded as undirected edges between nodes. If there are multiple edges between adjacent nodes, they are regarded as different edges; all paths between any two nodes in the electrical island are searched; if there is only one path between any two nodes in the electrical island, the radial network index of the electrical island is yes, and the corresponding value is 1, otherwise the radial network index of the electrical island is no, and the value is 0; if there are more than one path between any two nodes in the electrical island, the multi-circuit loop index of the electrical island is yes, and the value is 1, otherwise the multi-circuit loop index of the electrical island is no, and the value is 0, if the value is 1. 12. The transmission network recovery state characteristic index generation system according to claim 10 is characterized in that when the characteristic index calculation module calculates the electrical island grid-connected water-thermal power fluctuation balancing characteristic index of each electrical island based on the operating mode data, it calculates the positive standby power of each electrical island and the output upper limit of the largest single power source according to the operating mode data; if the positive standby power of the electrical island is greater than the output upper limit of the largest single power source in the electrical island, then the electrical island grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power can be balanced, and the value is 1; otherwise, the electrical island grid-connected water-thermal power fluctuation balancing characteristic index is that water-thermal power cannot be balanced, and the value is 0. 13. The transmission network recovery state characteristic index generation system according to claim 10 is characterized in that, when the characteristic index calculation module calculates the balancing characteristic index of the grid-connected new energy power generation fluctuation of each electrical island based on the operating mode data, the new energy output and rotating reserve of each electrical island are respectively counted according to the operating mode data; if the positive rotating reserve of the electrical island is greater than or equal to the maximum value of the downward fluctuation of the new energy power generation output of the electrical island, and the negative rotating reserve of the electrical island is greater than or equal to the maximum value of the upward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0; if wind and solar power abandonment is allowed, and the positive rotating reserve of the electrical island is greater than or equal to the maximum value of the downward fluctuation of the new energy power generation output of the electrical island, then the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is balancing new energy fluctuation, and the value is 1; otherwise, the balancing characteristic index of the grid-connected new energy power generation fluctuation of the electrical island is unbalanced new energy fluctuation, and the value is 0. 14. The transmission network recovery state characteristic index generating system according to claim 10 is characterized in that, when the characteristic index calculation module calculates the electrical island DC system recovery state index of each electrical island based on the operating mode data, it judges the state of the DC system of the electrical island according to the operating mode data; if the DC system state of the electrical island is bipolar operation, the electrical island DC system recovery state index is the ratio of the bipolar line transmission power to the rated transmission power of the DC system, and the value is 2; if the DC system state of the electrical island is in operation and unipolar operation, the electrical island DC system recovery state index is twice the ratio of the line transmission power to the rated transmission power of the DC system, and the value is 1. 15. The transmission network recovery state characteristic index generating system according to claim 10 is characterized in that, when the characteristic index calculation module calculates the recovery characteristic index of the electrical island safety and stability control device of each electrical island based on the operating mode data, it judges the emergency control system state and the low-frequency and low-voltage load reduction device state of the electrical island according to the operating mode data; if the emergency control system state of the electrical island is in operation and the emergency control system has no abnormality or alarm information, then the electrical island safety and stability control device recovery characteristic index is restored, and the value is 1; otherwise, the electrical island safety and stability control device recovery characteristic index is not restored, and the value is 0; if the low-frequency and low-voltage load reduction device state of the electrical island is in operation and the low-frequency and low-voltage load reduction device has no abnormality or alarm information, then the electrical island safety and stability control device recovery characteristic index is restored, and the value is 1; otherwise, the electrical island safety and stability control device recovery characteristic index is not restored, and the value is 0. 16. The transmission network recovery state characteristic index generation system according to claim 10 is characterized in that, when the characteristic index calculation module calculates the recovery completeness index of the whole network and the power supply area based on the operation mode data, it judges the equipment operation status of each station and the line status of each power supply area according to the operation mode data; if, except for the primary equipment and safety and stability control devices in the station that are planned to be shut down and in the standby state under normal conditions, other primary equipment and safety and stability control devices have resumed normal operation and all loads have been restored, then the whole network recovery completeness index is fully recovered, and the value is 2; if the primary equipment and safety and stability control devices in the station are all in the shutdown state, the station is in a full stop state, and the whole network recovery completeness index is a full stop state, and the value is 0; if the primary equipment and safety and stability control devices in the station are all in a partially recovered state, then the whole network recovery completeness index is partially recovered, and the value is 0; If all the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas have been restored, except for the lines that are planned to be shut down and the lines that are standby under normal operating conditions, the power supply partition recovery completeness index is fully restored, and the value is 2; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are all in an outage state, the power supply partition recovery completeness index is 0; if the internal lines of the power supply area and the connecting lines between it and the adjacent power supply areas are partially restored, the power supply partition recovery completeness index is partially restored, and the value is 1.