阅读说明：本技术 一种基于实时故障数据的分支系数计算方法 (Branch coefficient calculation method based on real-time fault data ) 是由 刘斌 李海勇 蒋连钿 毛建维 谢华 熊蕙 李枫 于 2019-11-13 设计创作，主要内容包括：本发明公开了一种基于实时故障数据的分支系数计算方法,从能量管理系统获取实时故障线路,根据能量管理系统模型拓扑搜索故障线路两侧供电路径上的其他线路,召唤供电路径上线路对应线路保护装置的波形列表,召唤供电路径上线路对应线路保护装置的波形文件,计算波形文件的故障电流,通过实时拓扑计算故障运行方式下实际的分支系数。本发明获取故障时刻实际的分析系数为保护人员校核保护定值提供了有力帮助。(The invention discloses a branching coefficient calculation method based on real-time fault data, which comprises the steps of acquiring a real-time fault line from an energy management system, searching other lines on power supply paths on two sides of the fault line according to the energy management system model topology, calling a waveform list of a line protection device corresponding to the line on the power supply path, calling a waveform file of the line protection device corresponding to the line on the power supply path, calculating fault current of the waveform file, and calculating an actual branching coefficient in a fault operation mode through the real-time topology. The method and the device for obtaining the actual analysis coefficient at the fault moment provide powerful help for the protection personnel to check the protection fixed value.)

1. A branch coefficient calculation method based on real-time fault data is characterized by comprising the following steps:

step S1, acquiring a real-time fault line from the energy management system;

step S2, according to the fault line obtained in the step S1, other lines on power supply paths on two sides of the fault line are searched through an energy management system model topology;

step S3, calling a waveform list of a corresponding line protection device on a line on a power supply path by calling the waveform list in the protection and fault information management system;

step S4, calling the waveform file of the corresponding line protection device on the line on the power supply path by calling the waveform file in the protection and fault information management system;

step S5, calculating the fault current of the waveform file;

step S6, a branching coefficient of the actual line fault current in the fault-time operation mode is calculated.

2. The method according to claim 1, wherein the method comprises the following steps: the step S1 of acquiring the real-time fault line from the energy management system means acquiring the real-time fault line by receiving the alarm information of the fault determination module of the energy management system in real time.

3. The method according to claim 2, wherein the method comprises the following steps: the energy management system fault judgment module adopts any module for judging faults by the energy management system, and comprises an integrated intelligent alarm module, an accident trip module and a fault diagnosis module.

4. The method according to claim 1, wherein according to the fault line obtained in step S1, topology searching is performed through an energy management system model to search for other lines on power supply paths on both sides of the fault line, an on-off state of a switch knife is considered in the process of topology searching outward on both sides of the fault line, if the switch or the knife is in an off position, the topology searching is stopped, and if the switch or the knife is in an on position, the topology searching is continued.

5. The method according to claim 1, wherein the method comprises the following steps: after the step S2 finds the line on the power supply path, calling the waveform list of the line protection device corresponding to the line needs to judge whether the line protection device is currently interrupted in communication with the protection substation, and if the communication is interrupted, calling is not needed; and if the communication is normal, calling the list.

6. The method according to claim 1, wherein the method comprises the following steps: after the waveform list of the line protection device corresponding to the line called in step S3 is successful, the line protection device returning to the waveform list further calls the waveform file, and the line protection device returning to the non-waveform list does not need to further call the waveform.

7. The method according to claim 1, wherein the method comprises the following steps: and step S4, after the waveform file corresponding to the line protection device is called successfully, calculating the fault current of the waveform file by using a full-period fourier integration algorithm, where the fault current is a primary value.

8. The method according to claim 1, wherein the method comprises the following steps: after the step S5 calculates the fault current corresponding to the waveform file, the branching coefficient between each line and the upper line is calculated by using the depth-first algorithm or the width-first algorithm according to the network topology.

Technical Field

The invention relates to the field of comprehensive processing and protection fixed value checking of power system faults by comprehensively utilizing real-time fault data by a main station, in particular to a branch coefficient calculation method based on the real-time fault data.

Background

When relay protection setting calculation is carried out in a relatively complex power system wiring mode, a branch circuit is often arranged between two protections matched with an upper stage and a lower stage, the branch circuit is divided into an increase-assisting branch circuit and an external-sucking branch circuit according to an element connected to the branch current, the wiring mode and the influence on the system, and in order to ensure the sensitivity of a current II section or a distance II section and the selectivity, the influence of the branch circuit on the relay protection setting calculation must be considered. The branch coefficient Kb in the relay protection setting calculation is usually set and calculated according to the maximum operation mode or the minimum operation mode of the power grid. The protection constant value setting personnel cannot obtain the constant value of the branch coefficient in the actual operation of the power grid, whether the protection constant value related to the branch coefficient is set reasonably or not is judged, and the protection constant value setting personnel cannot check the protection constant value.

Disclosure of Invention

In order to solve the above problems, the present invention provides a branch coefficient calculation method based on real-time fault data, and the specific technical scheme is as follows:

a branch coefficient calculation method based on real-time fault data comprises the following steps:

step S1, acquiring a real-time fault line from the energy management system;

step S2, according to the fault line obtained in the step S1, other lines on power supply paths on two sides of the fault line are searched through an energy management system model topology;

step S3, calling a waveform list of a corresponding line protection device on a line on a power supply path by calling the waveform list in the protection and fault information management system;

step S4, calling the waveform file of the corresponding line protection device on the line on the power supply path by calling the waveform file in the protection and fault information management system;

step S5, calculating the fault current of the waveform file;

step S6, a branching coefficient of the actual line fault current in the fault-time operation mode is calculated.

Further, the step S1 of acquiring the real-time fault line from the energy management system means acquiring the real-time fault line by receiving the alarm information of the fault determination module of the energy management system in real time.

Furthermore, the energy management system fault judgment module adopts any module for judging faults by the energy management system, and comprises a comprehensive intelligent alarm module, an accident trip module and a fault diagnosis module.

Further, according to the fault line obtained in step S1, other lines on the power supply paths on both sides of the fault line are searched for through the energy management system model topology, the switching-on and switching-off state of the switch disconnecting link is considered in the outward topology searching process on both sides of the fault line, if the switch or the disconnecting link is at the switching-off position, the topology searching is stopped, and if the switch or the disconnecting link is at the switching-on position, the topology searching is continued.

Further, after the line on the power supply path is searched in step S2, calling a waveform list of a line protection device corresponding to the line needs to determine whether the line protection device is currently disconnected from the substation for protection, and if the communication is disconnected, calling is not needed; and if the communication is normal, calling the list.

Further, after the step S3 calls the waveform list of the line protection device corresponding to the line successfully, the line protection device returning to the waveform list calls the waveform file further, and the line protection device returning to the non-waveform list does not need to call the waveform further.

Further, after the waveform file corresponding to the line protection device is successfully called in step S4, the fault current of the waveform file is calculated by using a full-period fourier integration algorithm, where the fault current is a primary value.

Further, after the fault current corresponding to the waveform file is calculated in step S5, the branching coefficient between each line and the upper line is calculated by using a depth-first algorithm or a width-first algorithm according to the network topology.

The invention has the beneficial effects that:

in the power system protection fixed value setting calculation, the common method for calculating the branch coefficient is still to calculate the branch coefficient in the maximum operation mode and the minimum operation mode. The method just calculates the actual branch coefficient under the operation mode at the moment of the power grid fault, and after the coefficient is obtained, the minimum branch coefficient in the protection constant value setting can be checked, so that the correctness of the II-section protection constant value setting can be further checked.

Drawings

FIG. 1 is a flow chart of the calculation of the present invention.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings in which:

as shown in fig. 1, a method for calculating a branch coefficient based on real-time fault data includes the following steps: a branch coefficient calculation method based on real-time fault data comprises the following steps:

step S1, obtaining a real-time fault line from the energy management system,

the method for acquiring the real-time fault line from the energy management system only acquires data in the fault judgment module actually used by the energy management system, and the acquisition mode of acquiring the real-time fault line from the energy management system comprises calling a message bus of the energy management system, reading an alarm library of the energy management system or an interaction mode agreed by the two parties, and the information of acquiring the real-time fault line from the energy management system comprises an object identifier or a global unified code of the energy management system line, and identifies the unique identity of the line in the energy management system.

Step S2, after the fault line is obtained in step S1, a depth priority algorithm or a width priority algorithm is adopted to search power supply points, namely electrified generators, from the two sides of the fault line in an outward topological mode, the on-off state of a switch disconnecting link needs to be considered in the outward topological searching process, and if the switch or the disconnecting link is at the switching-off position, topological searching is stopped; if the switch or the disconnecting link is at the switching-on position, the topology searching is continued, in the process of the topology searching, the number of layers (threshold value) of the topology searching can be considered because the line protection device is not started and has no waveform, namely, the searching is stopped when searching for a plurality of layers from the fault line, in addition, the number of layers of the topology searching is also considered from the two sides of the fault line to the outer topology, and the number of layers is a parameter and can be set.

Step S3, after the line on the power supply path is obtained in step S2, a waveform list of a line protection device corresponding to the line is called through calling a waveform list calling interface in the protection and fault information management system, and the waveform list of the calling line protection device needs to judge whether the line protection device is interrupted in communication with the information protection substation at present or not, if the communication is interrupted, the calling is not needed, the communication is normal, and the list is called; the call waveform list interface typically contains start time, end time, station address, line protection device address parameters.

Step S4, after the waveform list of the line protection device is called in step S3, the line protection device returning to the waveform list realizes further calling of the waveform file by calling a waveform file calling interface in the protection and fault information management system, and the line protection device returning to the non-waveform list does not need to further call the waveform file; the calling waveform file interface usually contains parameters such as a station address, a line protection device address, a waveform file name and the like.

Step S5, after the waveform file of the line protection device is called in step S4, the waveform file of the line protection device is opened, verified, and analyzed, and the primary value of the fault current in the waveform file is obtained. And (3) checking if the opened waveform file is normal, checking according to a comtrade format, successfully checking, extracting waveform data of three-phase current, three-phase voltage, zero-sequence current and zero-sequence voltage, failing to check, finishing waveform file analysis, failing to open the waveform file, finishing waveform file analysis, then calculating a primary value of fault current, and starting from a current abrupt change, calculating the maximum value of the short-circuit current by a full-period Fourier calculation method.

And step S6, after calculating the fault current primary value of each line through step S5, sequentially searching from the fault line to power supply points on two sides in a topological mode, and calculating the actual fault current branching coefficient of the line and the previous line by adopting a depth-first algorithm or a width-first algorithm.

The present invention is not limited to the above-described embodiments, which are merely preferred embodiments of the present invention, and the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.