Low-voltage capacitor high-speed switching compensation module and control method thereof

Abstract

The invention belongs to the field of low-voltage capacitor switching compensation, and provides a low-voltage capacitor high-speed switching compensation module and a control method thereof. Wherein the compensation module comprises a circuit breaker, a fling-cut switch, a reactor, a capacitor and a module control board; the module control board is provided with a digital phase locking unit and a non-inrush current switching logic unit. The digital phase-locking unit is used for phase-locking three-phase voltage of a power grid; the inrush current-free switching logic unit is used for finding out a power grid three-phase voltage peak point moment after phase locking, and triggering a switching switch at the power grid three-phase voltage peak point and switching the switching switch into a capacitor after receiving an external switching command; the switching switch is composed of a silicon controlled rectifier and a diode which are in anti-parallel connection; when the silicon controlled rectifier in the switching switch is switched off, the capacitor is charged through the diode, and when the diode is switched off, namely the switching switch is switched off, the capacitor is charged to the voltage at the peak value of the line voltage so as to wait for responding to the switching instruction again to achieve the purpose of high-speed switching.

Description

technical field [0001] The invention belongs to the field of low-voltage capacitor switching compensation, and in particular relates to a low-voltage capacitor high-speed switching compensation module and a control method thereof. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The synchronous triggering method of traditional thyristor switching capacitance compensation mostly adopts zero-crossing detection of thyristor terminal voltage or phase-locked detection of power supply voltage zero-crossing. When the zero-crossing detection method of the thyristor terminal voltage switches the capacitance of the series reactor, it takes a certain discharge time to put it in again after it is cut off, resulting in the problem of slow response time or short-term lack of phase operation. In the case of high-power impact load or phase-controlled rect...

AI Technical Summary

Problems solved by technology

Therefore, the traditional capacitance compensation branch cannot timely cut off the branch circuit in the early stage of the fault when the thyristor has a breakdown and conduction or the breakdown voltage drops at the critical point and the thyristor is automatically turned on and off.

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