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Single-end electrical quantity full-line quick-acting protection method using choke coil to construct line boundary

A full-line fast-acting, electrical quantity technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of difficult current protection coordination, inability to use large-scale, and reduced protection sensitivity, achieving low impedance, simple installation, and low cost. Effect

Active Publication Date: 2019-01-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the AC system, the ability of the inverter to provide short-circuit current effectively reduces the protection sensitivity; for the DC system, the vulnerability of the converter requires the protection to quickly remove the fault
At the same time, for the distribution network, the access of distributed power sources makes it a multi-source power supply system. The bidirectional flow of short-circuit current makes it difficult to cooperate with current protection. Communication is required when using double-ended differential protection and longitudinal protection. , high cost, unable to be used on a large scale

Method used

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  • Single-end electrical quantity full-line quick-acting protection method using choke coil to construct line boundary
  • Single-end electrical quantity full-line quick-acting protection method using choke coil to construct line boundary
  • Single-end electrical quantity full-line quick-acting protection method using choke coil to construct line boundary

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] 1: For figure 1 In the distribution network simulation model shown, magnetic rings are installed on the side close to the main power supply as the boundary, and magnetic rings are installed at the exit of the line where the DG is located close to the main line; to investigate the protection action at the head end of the 3.6km line, f 1 The point is the fault in the positive direction, f 2 is the out-of-area fault in the positive direction, f 3 For external faults in the opposite direction, the sampling rate is 2MHz.

[0050] 2: Use the traveling wave voltage sensor to collect the relative ground voltage u on the side of the magnetic ring line line And the voltage difference u between the busbar side and the line side of the magnetic ring d , and the three phase-to-ground voltages on the line side of the magnetic ring and the voltage difference between the busbar side and the line side of the magnetic ring are respectively subjected to phase-to-mode conversion through...

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Abstract

The invention discloses a single-end electrical quantity full-line quick-acting protection method using a choke coil to construct the line boundary, according to the topology of different power supplysystems, the choke coil is installed on the line to construct the line boundary, and then the protection criterion is constructed according to the difference of the electric quantity between the protected line area and the internal and external faults, so as to realize the single-end electric quantity full-line quick-action protection. The invention adopts choke coil to construct the boundary ofthe circuit and realizes the single-end quantity full-line quick-acting protection on the circuit without boundary element, As that method of the invention can effectively overcome the problem of lowsensitivity of the pow frequency protection of the alternating current circuit in the multi-converter, It also meets the requirements of fast operation of protection for DC lines. At the same time, itdoes not need protection coordination when applied to distribution network. Only the electrical quantity of a single end can realize the rapid identification of faults inside and outside the protection zone, and it can effectively solve the relay protection problem of a power grid including multiple converters.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a single-end electric quantity full-line rapid protection method using a choke coil to construct a line boundary. Background technique [0002] With the large-scale access of wind turbines and photovoltaic power sources and the large-scale application of DC power transmission and distribution, the power system presents a form with multiple converters. For the AC system, the ability of the inverter to provide short-circuit current effectively reduces the protection sensitivity; for the DC system, the vulnerability of the converter requires the protection to quickly remove the fault. At the same time, for the distribution network, the access of distributed power sources makes it a multi-source power supply system. The bidirectional flow of short-circuit current makes it difficult to cooperate with current protection. Communication is requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 宋国兵常仲学张维郭上华樊占峰张恒泰刘健石光唐震
Owner XI AN JIAOTONG UNIV
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