1.云南电网有限责任公司昆明供电局;2.湖南大学电气与信息工程学院 湖南 长沙
1.Yunnan Power Grid Co,Ltd Kunming Power Supply Bureau,Yunnan Kunming;2.Colleage of Electrical and Information Engineering, Hunan University
The loop-opening and loop-closing operation can avoid outage when switching power supply, and then improve the reliability of distribution network. In order to ensure the safety of loop-closing operation, as well as the economy and power quality after loop-opening, an optimal control strategy considering the whole process of loop-closing and loop-opening operation was proposed. Compensation capacitors, transformer taps and distributed generation were used as control means, and control target was set to minimize all the regulation times in loop-closing and loop-opening, the maximum load rate during loop-closing, the network loss and voltage deviation after loop-opening. The historical load of distribution transformer was used to calculate the load power of distribution network, which improved the accuracy and real-time of power flow calculation. After the mathematical optimal model was established, the multi-objective particle swarm optimization algorithm was used to get the Pareto optimal set of control schemes. The simulation results of a practical example in different scenarios verified the effectiveness of the proposed control strategy.