Study on the Influence of Three-Phase Imbalance of Low-Voltage Distribution Network with Current Imbalance Degree

In urban and rural low-voltage three-phase four-wire distribution systems, the problem of three-phase imbalance is more prominent, seriously affecting the operational economy and security of distribution networks. Therefore, this paper first investigates the main mechanism of the three-phase imbalance problem. Then it comprehensively analyzes the impact of different factors, such as load asymmetry, line parameters asymmetry, and asymmetric access of distributed power supplies, on the three-phase imbalance. Finally, the proposed calculation method is verified through a simulation case and gives constructive suggestions on the planning and construction of load, distribution line and distributed power supply, which has certain reference value for the management of the three-phase imbalance of distribution network.