Rapid self-adaptive fault detection and identification method for microgrid line section

A fault detection and self-adaptive technology, applied in fault location, fault detection according to conductor type, measurement of electricity, etc., can solve problems such as rapidity and insufficient adaptability

Active Publication Date: 2020-09-11
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to propose a fast self-adaptive fault detection and identification method for micro

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  • Rapid self-adaptive fault detection and identification method for microgrid line section
  • Rapid self-adaptive fault detection and identification method for microgrid line section
  • Rapid self-adaptive fault detection and identification method for microgrid line section

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Embodiment Construction

[0135] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0136] figure 1 It is the basic principle diagram of the specific implementation method of the present invention. like figure 1 As shown, the power system located upstream and downstream of the line section 103 to be detected is in figure 1 can be equivalently expressed as an equivalent upstream power system 101 and an equivalent downstream power system 102 . The equivalent upstream power system 101 can be expressed as a voltage of The voltage source of is used to stabilize the voltage and frequency of the system while providing power; the equivalent downstream power system 102 is represented as a distributed power supply P DG and load P L in parallel.

[0137] Node i and node j at both ends of the line section 103 to be detected are equipped with three-phase current acquisition devices, which can synchronously acquire node three-phase c...

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Abstract

The invention discloses a rapid self-adaptive fault detection and identification method for a micro-grid line section. The method comprises the following steps: collecting node three-phase current atnodes at two ends of the line section; calculating an instantaneous phase difference value and a phase threshold value of a three-phase current high-frequency component of the line section, and a nodezero-sequence current effective value and a zero-sequence current threshold value at nodes at two ends of the line section; judging a fault based on comparison of an instantaneous phase difference value and a phase threshold value of a three-phase current high-frequency component of a line section, and on this basis, further obtaining a specific fault type based on comparison of node zero-sequence current effective values and zero-sequence current threshold values at nodes at the two ends of the line section. According to the method, various faults occurring in the microgrid line section canbe detected, and the method can be universally applied to microgrids in grid-connected operation and island operation states; according to the method, the fault judgment threshold value can be updatedin real time, and good adaptability is achieved; the method is high in detection speed, and fault detection can be completed within tens of milliseconds and the fault type can be correctly identified.

Description

technical field [0001] The invention relates to the field of micro-grid protection, in particular to a fast self-adaptive fault detection and identification method for line sections of a micro-grid. Background technique [0002] Microgrid fault detection technology is the basis of microgrid protection and fault isolation. It can quickly and timely detect faults after a fault occurs, which is conducive to the rapid processing of faults in the microgrid, and can effectively reduce the adverse effects of faults on the safe and stable operation of the microgrid. Fast fault detection is of great significance and practical value to microgrids. Microgrids often contain multiple types of distributed power sources. At the same time, microgrids also have flexible system operation modes, which brings many problems to rapid fault detection in microgrids, such as bidirectional power flow in the system, distributed power Fluctuations in output power and changes in system operating status...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 李一锦林建华魏旭腾牛耕
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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