Three-phase unbalanced load switching method based on networking of phase-change switch

Abstract

The invention provides a three-phase unbalanced load switching method based on the networking of a phase-change switch. A phase-change switch system in a low-voltage power distribution area comprisesa main control box for conducting the three-phase voltage and current measurement and calculating the unbalance degree. Multiple phase-change boxes carry out uninterrupted power switching on a load phase sequence. The input ends of the phase-change boxes are connected with A, B and C three-phase power grids. The output ends of the phase-change boxes are connected with single-phase loads. When a plurality of phase-change boxes operate in a networking manner, each phase-change box acquires a current value of a load connected with each phase-change box and transmits the current value to the maincontrol switch box through 433MHz wireless communication. After that, the main control switch box calculates the three-phase unbalance degree, decides which switch box needs to be switched to which phase, and selects an optimal switch combination. According to the method, the accuracy of three-phase imbalance degree calculation is improved. The method is used for reducing the loss of a switching device, ensuring the long-term operation of the phase-change box to be safe and stable, and improving the safety of the phase-change switch system and the power supply reliability.

Description

technical field [0001] The invention belongs to the technical field of three-phase unbalance in electric power systems, and in particular relates to a method for switching three-phase unbalanced loads in a commutation switch network. Background technique [0002] With the vigorous development of the national economy, all walks of life and people's lives in our country have an increasing demand for electric energy. Not only the quantity requirements are put forward, but also the requirements for electric energy quality standards are gradually increasing. Good power quality can not only ensure the safe and stable operation of the entire power grid and power equipment, but also has great significance for improving industrial production and product quality and the stability and order of people's daily life. The three-phase unbalance is one of the important indicators of power quality. The specific value of three-phase unbalance: in the power system, the amplitude of the three-p...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a three-phase unbalanced load switching method based on the commutation switch network, to solve the limitations of the existing method, the problem of poor practicability, thereby improving the Practicability and Reliability of Phase Switch Networking Decision

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