A self-correcting system and method for synchronous switch zero-crossing switching

Abstract

The invention discloses a synchronization switch zero-crossing switching self-correction system. The system comprises a CPU, a control circuit, a remote signal detection circuit used for detecting whether a magnetic latching relay is closed or opened, and a sampling conditioning module used for acquiring a voltage and a current of a switch connection point of the magnetic latching relay. The invention further discloses a synchronization switch zero-crossing switching self-correction method. A closing or opening signal is emitted by the CPU to the magnetic latching relay at a moment, according to the closing or opening signal of the switch connection point of the magnetic latching relay detected by the remote signal detection circuit, closing time difference, opening time difference of the magnetic latching relay and time difference between closing and opening of the switch connection point of the magnetic latching relay and the coil signal are calculated, and the closing and opening time of the magnetic latching relay are corrected according to the three time differences and the voltage and the current of the switch connection point outputted by the sampling conditioning module. Through the system and the method, switching accuracy of a capacitor can be greatly improved, no-surge-current switching and no-arc breaking of the capacitor are realized.

Description

technical field [0001] The invention relates to a self-correcting system for zero-crossing switching of a synchronous switch, and also relates to a self-correcting method for zero-crossing switching of a synchronous switch, which belongs to the technical field of distribution networks. Background technique [0002] The synchronous switch is a new type of dedicated reactive power compensation capacitor switching switch developed in recent years. It is the perfect combination of traditional mechanical switches and modern microelectronics technology. It absorbs the advantages of simple control structure of AC contactor, zero-voltage input and zero-current cut-off of composite switch, and perfectly solves the problems of high-voltage harmonics and large inrush current during capacitor switching. The synchronous switch is based on a single-chip microcomputer, supplemented by a high-precision sampling circuit and a reasonable program design to achieve an ideal zero-crossing switch...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a synchronous switch zero-crossing switching self-correction system, to solve the problem of the magnetic latching relay in the prior art due to the time difference between the switch contact opening and closing and the coil signal. The technical problem of not being able to switch accurately at the zero crossing point

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