Intelligent capacitor switching composite switch and switching control method

Abstract

The invention discloses an intelligent capacitor switching composite switch and a switching control method, which can realize state monitoring, fault diagnosis and switching control on three independent composite switches and realize functions of zero crossing detection on voltage, in-situ human-machine interaction and wireless communication with a controller. The intelligent capacitor switching composite switch is composed of an intelligent composite switch control board and composite switches, wherein the intelligent composite switch control board comprises a micro control unit, and an in-situ human-machine interaction unit, a voltage zero crossing detection unit, a state monitoring and fault diagnosis unit, a switching control unit and a communication unit connected with the micro control unit; the composite switches are connected with the switching control unit; and a single group of composite switches is formed by a bidirectional thyristor SSR and an AC contactor normally-open contact KM in parallel connection, voltage zero crossing switching and current zero crossing cutting can be realized by the thyristor, passing of continuous current is realized by the AC contactor normally-open contact, the conduction loss problem of the thyristor can thus be avoided, and inrush current in the case of capacitor switching can also be avoided.

Description

technical field [0001] The invention relates to a capacitor switching device and a switching method, in particular to a power system reactive power compensation intelligent capacitor switching composite switch and a switching control method. Background technique [0002] Reactive power compensation is a technology that reduces the loss of power supply transformers and transmission lines, improves power supply efficiency, and improves the power supply environment. It plays a role in improving the power factor of the power grid in the power supply system. The reactive power compensation device based on the capacitor bank plays an indispensable and very important position in the power supply system. The static compensation method of delay switching is a common switching method of capacitors, which can prevent the capacitor from being damaged by too frequent actions, and more importantly, prevent the power supply system from oscillating due to the continuous switching of capacit...

AI Technical Summary

Problems solved by technology

The traditional compound switching switch realizes the monitoring from the controller to the compound switch by hard wiring, and the way of common compensation and sub-compensation is selected by dialing the key switch, which has the disadvantages of complicated operation, inconvenient use, and poor versatility. Adapt to the development needs of modern information technology

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