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Pilot Protection System and Its Method Based on Fault Component Virtual Impedance Differential

A virtual impedance and pilot protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of being susceptible to high-resistance grounding and high synchronization requirements for pilot protection

Active Publication Date: 2016-06-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a longitudinal protection system and method based on fault component virtual impedance differential, which is used to solve the problem that the traditional longitudinal protection requires high synchronization or is easily affected by factors such as high-impedance grounding and conversion faults. The problem

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  • Pilot Protection System and Its Method Based on Fault Component Virtual Impedance Differential
  • Pilot Protection System and Its Method Based on Fault Component Virtual Impedance Differential

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Embodiment 1

[0080] figure 1 It is the structural diagram of the longitudinal protection system based on the virtual impedance differential of the fault component provided by the present invention. Such as figure 1 As shown, the pilot protection system based on the virtual impedance differential of the fault component provided by the present invention includes a data reading module, a protection calculation module, and a protection action module that are connected in sequence.

[0081] The data reading module is used to collect line characteristic sequence impedance, line sequence propagation coefficient, voltage fault sequence components on both sides of the line, and current fault sequence components on both sides of the line, and send the collected data to the protection calculation module.

[0082] The protection calculation module is used to calculate the virtual sequence impedance of the line based on the characteristic sequence impedance of the line, the line sequence propagation coeffi...

Embodiment 2

[0131] The following is a simulation process to verify the correctness and rationality of the above-mentioned system and method. Figure 4 It is a 500kV ultra-high voltage system diagram of Beijing, Tianjin and Tangshan, based on PSCAD / EMTDC. Figure 4 The system shown serves as a simulation model.

[0132] The length of the simulation model line is 400km, and its parameters are: r 1 =0.02083Ω / km, l 1 =0.8948H / km, C 1 =0.0129μF / km, r 0 =0.1148Ω / km, l 0 =2.2886H / km, C 0 =0.00523μF / km. M side system: ,Z m =7.14+j101.54Ω, the zero sequence parameter is the same as the positive sequence; N side system: ,Z n =1.428+j20.308Ω, the zero sequence parameter is the same as the positive sequence. The simulation time is 0.8s, when the fault occurs at 0.5s, the sampling frequency is 6kHz, and the input time of the positive sequence criterion is within 60ms after the positive sequence criterion is activated.

[0133] In this embodiment, the ratio of the sequence action volume to the braking vol...

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Abstract

The invention discloses a pilot protection system and method based on fault component virtual impedance differential motion in the technical field of power system relay protection. The system comprises a data read-in module, a protection calculation module and a protection operating module which are sequentially connected. The method includes the steps: acquiring line characteristic sequence impedance, a line sequence transmission coefficient, voltage fault sequence components on two sides of a line and current fault sequence components on the two sides of the line; calculating virtual sequence impedance of the line; judging whether an operating criterion is met or not according to the virtual sequence impedance of a middle point of the line, judging that internal faults happen and immediately transmitting a tripping signal if the operating criterion is met; judging that external faults happen and omitting transmission of the tripping signal if the operating criterion is not met. The system can accurately judge the faults after the faults happen, and has high sensitivity for various faults, high reliability and fine selectivity under the condition of transformational faults.

Description

Technical field [0001] The invention belongs to the technical field of power system relay protection, and in particular relates to a longitudinal protection system and a method based on a virtual impedance differential of a fault component. Background technique [0002] The traditional pilot protection in high-voltage transmission lines mainly include pilot protection and current differential protection. The principle of longitudinal protection is simple and does not require strict synchronization of data at both ends, but it is easily affected by factors such as high-resistance grounding and switching faults, and when the sensitivity of the directional component at one end of the line is insufficient, it may cause protection to malfunction. The current differential protection has high sensitivity and can adapt to various complex faults and abnormal operating conditions. However, it has high requirements for the synchronization of measurement data and is affected by the capacitiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 马静裴迅马伟丁秀香王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)