Pre-adjustment Phase Control Arc Suppression Control Method

Abstract

The invention discloses a pre-adjusted phase-controlled arc suppression control method, which specifically includes the following steps: collecting system analog quantities; judging whether the system is in a single-phase grounding fault state, and if not, adopting an adaptive step length to quickly measure and locate a resonance section, And determine the resonance point of the zero-sequence circuit, and obtain the system capacitance current and the thyristor compensation phase angle θ of the phase-controlled arc suppression coil 0 ;The second measurement cycle determines the new resonance point and judges the compensation phase angle θ of the new resonance point 0 Whether it is valid or not; before the arrival of a new measurement cycle, no matter whether single-phase grounding occurs or not, the thyristor of the phase-controlled arc suppression coil will be compensated according to the compensation phase angle θ obtained in the latest measurement in each half cycle. 0 trigger. The invention greatly improves the measurement calculation speed and compensation output response speed of the phase-controlled arc suppression coil, and solves the problem of output delay after grounding.

Description

Pre-adjusted phase-controlled arc suppression control method technical field [0001] The present invention relates to the technical field of power supply control, in particular to a preset phase control method. Background technique [0002] With the rapid development of the city, a large number of cables are used in the distribution network, and the system capacitance current increases sharply, which has a negative impact on the safety of the power grid [0002] The full operation constitutes a hidden danger, which has attracted more and more attention from the management department. The capacity of the new arc suppression coil should be able to change smoothly and automatically Track and measure the capacitor current. When the single phase is grounded, it should act immediately and fully compensate the power frequency grounding current to prompt the arc to extinguish quickly. extinguish. [0003] The phase-controlled arc suppression coil is a specially designed high-imped...

AI Technical Summary

Problems solved by technology

However, at present, the arc suppression compensation of this phase-controlled arc suppression coil can only be adjusted with the method. When a single-phase ground fault occurs in the system, multiple cycles are needed to judge the grounding start compensation output, and the arc cannot be suppressed in time, and the instantaneous ground fault It basically does not work, which seriously limits the popularization and application of phase-controlled arc suppression coils

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