Commutation switch type three-phase load imbalance treatment device

Abstract

The invention discloses a commutation switch type three-phase load imbalance treatment device at least comprising a control part and an execution mechanism. The execution mechanism includes at least one commutation switch. The control part consists of at least one main controller; and a current sensor for detecting current information of a branch grid is also arranged. A signal output terminal of the current sensor is connected with an input terminal of the main controller electrically. And the main controller is connected to a three-phase grid. Each main controller is connected to the at least one commutation switch by wired communication or wireless communication and the commutation switch is electrically connected to the load. Each main controller detects a three-phase unbalanced current, fault information as well as a current phase, and a current load current of the commutation switch controlled by the main controller. On the basis of the unbalanced calculation strategy, calculation is carried out to obtain each switch adjustment target phase and a commutation command is issued. Therefore, large surge current occurrence caused instantaneously during load switching can be avoided; losses resulted from long-term operation of the thyristor can be avoided; and commutation can be carried out without power interruption.

Description

technical field [0001] The invention relates to the technical field of intelligent power distribution, in particular to a phase-change switch type three-phase load unbalance control device. Background technique [0002] In recent years, my country's distribution network construction investment has continued to increase, and the development of distribution network has achieved remarkable results. However, there is still a gap between the level of electricity consumption and the international advanced level. The development of urban and rural areas is unbalanced, and the quality of power supply needs to be improved. Building urban-rural planning, safe and reliable, cost-effective, technologically advanced, and environment-friendly power distribution network facilities and service systems can serve multiple purposes. It can not only protect people's livelihood, stimulate investment, but also promote the improvement of related manufacturing industries. The smart energy strategy ...

AI Technical Summary

Problems solved by technology

However, in the implementation of this scheme, the bidirectional thyristor has been working in the line for a long time. If there is lightning shock or other interference entering the device, it may cause the thyristor to be misconducted, and there is a possibility of phase-to-phase short circuit.

In addition, the contactor coil needs to be charged and closed for a long time, which consumes a lot of energy and ages quickly

And once the control circuit is powered off, the contactor is disconnected, which affects the continuity of power supply

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