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Method and system for positioning sub-synchronous oscillation online disturbance source of electrical power system

A technology for subsynchronous oscillation and disturbance source location, which is applied in the direction of measuring electricity, fault location, and measuring electrical variables, etc., can solve problems such as subsynchronous oscillation and power system hazards in power systems, achieve accurate positioning, ensure reliability, and reduce calculations. volume effect

Active Publication Date: 2019-04-26
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The series capacitor compensation and power electronic devices in the AC transmission system may induce the subsynchronous oscillation problem of the power system under certain conditions, which has caused great harm to the power system

Method used

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  • Method and system for positioning sub-synchronous oscillation online disturbance source of electrical power system
  • Method and system for positioning sub-synchronous oscillation online disturbance source of electrical power system
  • Method and system for positioning sub-synchronous oscillation online disturbance source of electrical power system

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Embodiment 1

[0086] figure 2 It is a flow chart of an online automatic fault location method for subsynchronous oscillation in a power system provided by an embodiment of the present invention.

[0087] refer to figure 2 , an online location method for subsynchronous oscillation faults in power systems, including:

[0088] Step 1: Divide the power system network according to voltage levels, and perform topology analysis on different voltage levels.

[0089] Step 2. When the power system is in normal operation, select characteristic nodes for online detection according to the voltage and current data collected by the PMU devices of each node in the system. When it is detected that there may be a subsynchronous oscillation, set the characteristic node as the current node and enter step 3, otherwise repeat step 2.

[0090] Step 3, judge whether there is a node of the same voltage level connected to the current node that has not been searched, if there is, go to step 4, otherwise go to st...

Embodiment 2

[0107] image 3 The harmonic current diagram of a certain area provided by the embodiment of the present invention.

[0108] refer to image 3, each electrical node in the figure is marked with a mark, such as A node, B node, C node..., and is divided into three major wind power areas, each accommodating 3494MW, 741MW and 3698MW wind turbines, and each branch divides the frequency domain (Hz) , Amplitude (Amp) and Phase Angle (Deg) three types of information are shown in the form of a table, the dotted arrows lead out the branches associated with the three types of information, and the solid line arrows indicate the flow direction of the fault. Embodiment 3 of the present invention will take this area as an example to illustrate the method of tracing the fault starting point.

[0109] First, divide the voltage level of this area, and perform topology analysis on different voltage levels, and get the following: Figure 4 The geographic wiring diagram shown. Then, collect an...

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Abstract

The invention provides a method and system for positioning a sub-synchronous oscillation online disturbance source of an electrical power system. The method comprises the steps: setting a current nodeaccording to acquired phase voltage and phase current data of each node of the electrical power system during normal operation of the electrical power system; searching for nodes connected with the current node according to a memorized search algorithm, comparing the online data processing results of the current node and its connected nodes, and positioning a sub-synchronous oscillation source. The technical scheme provided by the invention adopts the memorized search algorithm, so that the calculation amount is greatly reduced, and the speed of online positioning is improved.

Description

technical field [0001] The invention belongs to the field of relay protection of electric power systems, relates to positioning of subsynchronous oscillation sources of electric power systems, and in particular to a method and system for locating online disturbance sources of subsynchronous oscillations of electric power systems. Background technique [0002] Sub-synchronous resonance refers to a kind of electric power that endangers the safety of the generator shafting due to mutual energy exchange between the power network and the generator at one or more natural oscillation frequencies lower than the system synchronous frequency after the power line is connected in series with a fixed capacitor. System running status. The series capacitor compensation and power electronic devices in the AC transmission system may induce the subsynchronous oscillation problem of the power system under certain conditions, which has caused great harm to the power system. In order to ensure ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 李莹李文锋王官宏王晖韩志勇陶向宇晏青王衡李照庭
Owner CHINA ELECTRIC POWER RES INST
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