High-potential high-frequency pulse multistage power supply system for middle-high voltage solid-state AC switch

Abstract

The invention provides a high-potential high-frequency pulse multistage power supply system for a middle-high voltage solid-state alternating current switch, which comprises a power frequency alternating current transformer, a rectifying circuit, a resonant capacitor, a resonant circuit, a resonant inductor and a plurality of energy-taking magnetic rings. The power frequency alternating current transformer, the rectifying circuit and the resonant capacitor are sequentially connected to form a rectifying charging loop, the resonant capacitor, the resonant circuit and the resonant inductor form a resonant discharge loop, and each energy-taking magnetic ring is connected with the output end of the resonant discharge loop and is used for supplying power to a plurality of power electronic control circuits. According to the invention, the rectification circuit charges the resonant capacitor and absorbs energy from an AC system; the resonant circuit transmits energy stored by the capacitor to a high potential through LC resonance, and finally supplies power to a load through the energy-taking magnetic ring. The multi-stage power supply system has the advantages of being high in reliability, compact, low in cost and the like, and engineering implementation is easy.

Description

technical field [0001] The invention relates to the technical field of high potential power supply, in particular to a high potential high frequency pulse multistage power supply system for medium and high voltage solid state AC switches. Background technique [0002] AC circuit breaker is one of the most important equipment in the power grid. It is used to complete the operation mode switching, fault isolation and clearance of the system. It is the key equipment to prevent the expansion of accidents and ensure the safe operation of the power grid. Mechanical circuit breakers have the characteristics of low loss, slow breaking time, and arc breaking. The breaking time of the mechanical circuit breaker is between 20ms and 80ms. With the aging of the equipment, the breaking time becomes longer, which may not meet the safe operation requirements of the power grid. In addition, mechanical circuit breakers with arc breaking are prone to rapid degradation of the contacts, and the...

AI Technical Summary

Problems solved by technology

The breaking time of the mechanical circuit breaker is 20ms ~ 80ms. With the aging of the equipment, the breaking time becomes longer, and there are cases where it cannot meet the safe operation requirements of the power grid.

In addition, mechanical circuit breakers with arc breaking are prone to rapid contact degradation, and the resistance between contacts can also increase with time and use, causing the circuit breaker behavior to become unpredictable

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