Passive power-based method and system for determining field loss protection of phase modifier

Abstract

The invention discloses a passive power-based method and system for determining field loss protection of a phase modifier. The passive power-based method comprises the steps of performing And gate logic on first starting criterion, first low-voltage criterion and I-segment phase-entering passive power criterion, and performing And gate logic on second starting criterion, second low-voltage criterion and the I-segment phase-entering passive power criterion, wherein two And gate logic results and a OR gate logic form field loss protection I-segment criterion; and performing And gate logic on II-segment phase-entering passive criterion and excitation voltage criterion to form field loss protection II-segment criterion. When data information of the phase modifier conforms to the field loss protection I-segment criterion or the field loss protection II-segment criterion, the field loss protection reliably acts after a preset time threshold is delayed, the field loss protection is reliable without false action when the system is at a low voltage and the phase modifier is in the phase entering running process; and when a completely-demagnetized fault or a partially-demagnetized fault occurs in the phase modifier, the field loss protection acts reliability, and the problem of false operation of the field loss protection of the phase modifier when the system is at the low voltage and the phase modifier runs in a phase-entering way is solved.

Description

technical field [0001] The present invention relates to the technical field of relay protection, and more specifically, to a method and system for determining the loss-of-excitation protection of a condenser based on reactive power. Background technique [0002] In recent years, with the development of DC transmission, new energy, large power grid, UHV and other technologies and the extensive application of power electronic equipment, the operating characteristics of the power grid have changed greatly, and the reactive power required by the system is increasing day by day. It is necessary to solve the reactive power and voltage of the power grid. Problems, strengthen reactive power compensation and regulation capabilities. The synchronous condenser is a dedicated reactive power source, which can comprehensively improve the dynamic reactive power reserve of the system, and can solve various types of voltage stability problems such as insufficient dynamic reactive power of th...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes a method and system for determining the demagnetization protection of the condenser based on reactive power, so as to solve the problem of how to determine the demagnetization protection of the condenser and avoid malfunction

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