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Imprecise fault identification method for power grid completeness state information reconstruction

A state information and fault identification technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as difficult state information, and achieve the effects of improving monitoring efficiency, strong theoretical foundation, and strong practicability

Active Publication Date: 2019-10-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual operation process, due to the misoperation or non-operation of protection devices, circuit breakers and other electrical equipment, error information or the lack of useful information often directly affect the results of fault diagnosis, and all status information of relay protection must be sent to There are great difficulties in entering the dispatch center, so in this case many methods cannot satisfy

Method used

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  • Imprecise fault identification method for power grid completeness state information reconstruction
  • Imprecise fault identification method for power grid completeness state information reconstruction
  • Imprecise fault identification method for power grid completeness state information reconstruction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0047] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0048] WAMS (Wide-Area Measurement System): wide-area measurement system;

[0049] RTU (Remote Terminal Unit): remote terminal control system

[0050] PMU (Phasor Measurement Unit): power system synchrophasor measurement;

[0051] ODP (Optimal Device Placement): the optimal configuration of the device;

[0052] figure 1 It is a flow chart of an imprecise fault identification method for reconstruction of power grid integrity status information in the present invention.

[0053] In this example, if figure 1 As shown, the present invention is an imprecise fault identification method for reconstruction of power grid integrity state information, comprising the following steps:

[0054] S1. Obtain the operating parameters and topology parameters of the power grid, as well as the fault eigenvector of the power grid in a fault mode;

[0055] S2....

example

[0098] Taking the IEEE11 system as an example, use PSASP for simulation.

[0099] Add a two-phase short-circuit ground fault to each line in the system separately, and test at 10 positions of 0%, 10%, 20%, ..., 90%, 100% of the line, and divide them into 10 fault categories. mark it as A i (i=1,2,...,10). These 10 lines are sequentially numbered and marked as A 1 ~A 10 . like figure 2 As shown, when a fault occurs, the optimized configuration of the PMU collects the voltage phasor of the installation point. Assuming that the optimized RTU or PMU installation point is set to No. 3, 5, and 6 buses, the measured voltage is U 1 , U 2 , U 3 , forming the eigenvector x=[U 1 u 2 u 3 ].

[0100] like image 3 As shown, add AB two-phase short-circuit ground fault to the midpoint of line 5-7, set the fault time to 2-2.2s, and the voltage amplitude waveform of the characteristic point (3, 5, 6) simulated by the system,

[0101] Suppose U i , i=1, 2,..., n obeys Gaussian di...

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Abstract

The invention discloses an imprecise fault identification method for power grid completeness state information reconstruction. WAMS of an RTU and a PMU is used for synchronous phasor measurement, wide-area fault information is provided, the requirements for real-time performance and globality of tidal current fingerprint collection are met as much as possible, under the condition that fault samples and information are incomplete, an imprecise probability principle is introduced for research, and the requirement for fault tolerance is met as much as possible. Besides, wide-area measurement is taken as a background, and fault information acquired by the power flow fingerprints of the RTU and the PMU is combined to an inaccuracy principle so that fault identification can be performed under the condition of power grid uncertainty.

Description

technical field [0001] The invention belongs to the technical field of power system fault diagnosis, and more specifically relates to an inaccurate fault identification method for reconstructing complete state information of a power grid. Background technique [0002] With the implementation of my country's "smart grid" strategy and the formation of UHV and large power grid interconnection patterns, it is urgent to improve fault diagnosis and fault location technology to protect the safety of large power grids. SCADA / EMS system is currently an online monitoring and data acquisition system commonly used by domestic power grid companies at all levels, and EMS is currently the most complete energy management system in the field of power systems. RTU is the foundation and core of the SCADA system. It mainly completes functions such as data collection, data communication and execution of control center commands. The communication network transmits the data collected by RTU to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02J3/00
CPCH02J3/00G06F2111/04G06F30/20H02J2203/20Y02E60/00
Inventor 易建波张鹏滕予非张真源郭卓麾付艳阳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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