Research on Hierarchical Cooperative Voltage Regulation Strategy of New Distribution Network

The voltage fluctuation on the low voltage side caused by the distributed power supply in the new distribution network is the key factor affecting the power quality of users. In order to solve the problem of voltage regulation in new distribution network, this paper proposes a hierarchical voltage regulation control strategy based on on-load regulation transformer (OLTC) and modular controllable distribution transformer (HDT) under the condition of sufficient reactive power. In this strategy, the concept of voltage cross section quality is first proposed and the model is given. Then the voltage fluctuation range is divided into three regions: I region is normal region, II region is slight over-limit region, and III region is serious over-limit region. Considering the economy and fast response of HDT, the strategy uses HDT as the main adjustment mode and OLTC as the backup adjustment means. Finally, by comparing the adjustment effects under different strategies, the rationality of the proposed strategies is verified.