Intelligent commutation control device and commutation control method

Abstract

The invention provides an intelligent commutation control device and a commutation control method. A processor is used for receiving a three-phase voltage signal and a three-phase current signal, transmitted by an analog input model, of a power distribution network, and the three-phase voltage, load current amplitude and a phase are calculated by a half-wave Fourier transformation algorithm to achieve functions of measurement displaying, communication and remote transmission; after a commutation instruction emitted from an area control terminal is received, a voltage sampling waveform and a current sampling waveform are judged in real time, and a commutation control module is controlled to emit the commutation instruction to achieve commutation action; after the commutation action is completed, an operation result is uploaded to the area control terminal by a carrier communication module; and the commutation control module is used for controlling an electronic commutation switch to execute phase action according to the commutation instruction emitted by the process. By the intelligent commutation control device and the commutation control method, a intelligent seamless commutation technology is achieved, a voltage phase zero-cross point and a current phase zero-cross point are traced in real time during the whole processes of commutation instruction receiving and commutation completion, the switching operation consumes short time and is reliable, and moreover, no commutation overlap is ensured.

Description

technical field [0001] The invention relates to the field of distribution networks, in particular to an intelligent commutation control device and a commutation control method. Background technique [0002] There are many power users in my country's distribution network and their locations are scattered, and there are a large number of single-phase loads with unbalanced spatio-temporal distribution, resulting in varying degrees of unbalanced three-phase loads in most distribution areas. The unbalanced three-phase load will increase the loss of distribution transformers and load lines in the distribution station area, the voltage quality of the heavy-load phase in the distribution station area will decrease, the output of the distribution transformer will decrease, and the power conversion efficiency will decrease. The eddy current loss caused by the increase of the zero-sequence current of the electric transformer increases the operating temperature of the distribution trans...

AI Technical Summary

Problems solved by technology

The unbalanced three-phase load causes an increase in the loss of distribution transformers and load lines in the distribution station area, a decrease in the voltage quality of the heavy-load phase in the distribution station area, a decrease in the output of the distribution transformer, and a decrease in the power conversion efficiency. The zero-sequence current of the electric transformer increases, and the eddy current loss caused by it increases the operating temperature of the distribution transformer, endangering the safety and life of the transformer.

But the disadvantage is that the conventional reversing switch is based on the mechanical opening and closing operation, and there is a short-term power interruption during the switching period, which cannot be accepted by the power supply department and users

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