基于相位补偿的配电网30°合环环流抑制技术

随着经济社会的发展，对配电网供电可靠性的要求日益增高，研究存在电压相位差的电网合环问题，抑制合环过程中产生的环流，具有重要的应用价值。针对存在30°相位差的35 kV电网合环问题展开研究，使用串联变压器和四象限变流器分别进行静态、动态电压补偿。基于电压矢量叠加原理，设计串联移相变压器以补偿两进线端之间的电压差，与传统全功率移相变压器相比，所需变压器容量减半，使成本大幅降低。同时采用四象限变流器进行电压动态补偿，实现电压和相位的在线精准调节。设计在线合环策略，寻找最佳合环点自动合环，实现在线不停电倒负荷，有效改善电网电能质量及供电稳定性，提高配电网合环过程智能化水平。

Suppression technology for circulation in 30-degree phase difference distribution network based on phase compensation

With the development of economy and society, the requirements for the reliability of distribution network power supply are increasing day by day. It has important application value to study the problem of power grid closure with voltage phase difference and to suppress the circulation problem during the loop closure process. In order to investigate the problem of 35kV power grid closing with a phase difference of 30°, a series transformer and a four-quadrant converter are used for static and dynamic voltage compensation. Based on the principle of voltage vector superposition, a series of phase-shifting transformers are designed to compensate for the voltage difference between the two input terminals. Compared with traditional full-power phase-shifting transformers, the required transformer capacity is halved, which greatly reduces costs. At the same time, a four-quadrant converter is used for dynamic voltage compensation to achieve online and precise adjustment of voltage and phase. Design an online loop-closing strategy, find the best loop-closing point, and automatically close the loop to achieve online uninterrupted load reversal, effectively improve the power quality and power supply stability of the power grid, and increase the level of intelligence in the power grid closure process.