Zero sequence current compensation system of low voltage distribution network

Abstract

The application provides a zero sequence current compensation system of a low voltage distribution network. The zero sequence current compensation system of the low voltage distribution network comprises a zigzag transformer connected with the low voltage distribution network, a single phase inverter, an electric current detection device used to detect an electric current of a neutral line of the zigzag transformer, an electric current of a neutral line of the low voltage distribution network and an electric current of a neutral line of a load and an inverter controller used to control the single phase inverter according to detection results of the electric current detection device, wherein one output end of the single phase inverter is connected with the neutral line of the zigzag transformer, and the other output end of the single phase inverter is connected with the neutral line of the load and the neutral line of the low voltage distribution network. The zero sequence current compensation system of the low voltage distribution network can enable a zero sequence current to form a loop circuit among the zigzag transformer, the single phase inverter and the load, and then reduces the electric current of the neutral line of the low voltage distribution network to zero, and thereby achieves compensation for the zero sequence current of the low voltage distribution network, and furthermore solves the problem that three phases of the low voltage distribution network are imbalanced.

Description

technical field [0001] The present application relates to the field of electric power technology, and more specifically, relates to a zero-sequence current compensation system of a low-voltage distribution network. Background technique [0002] my country's distribution network adopts a three-phase four-wire distribution transformer power supply mode, and the transformer capacity is less than 100kVA, which accounts for about half of the total number of transformers in the world. Because the distribution is basically done manually, it is easy to cause low-voltage single-phase loads in the distribution network to fail. These factors inevitably lead to the unbalanced three-phase problem of the low-voltage distribution network. [0003] Unbalanced three-phase will lead to neutral line overload, overheating, and electromagnetic interference, affect the supply voltage waveform, insulation layer damage, reduce power factor, reduce the service life of transformers and electrical equi...

AI Technical Summary

Problems solved by technology

[0004] In view of this, this application provides a zero-sequence current compensation system for low-voltage distribution network, which is used to compensate zero-sequence current to solve the three-phase imbalance problem of low-voltage distribution network

Images