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《Automation of Electric Power Systems》 2005-09
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Optimal Time-varying Reactive Power and Voltage Control in Distribution Systems

FANG Xing,GUO Zhi-zhong (Harbin Institute of Technology,Harbin 150001,China) (Electric Power Research Institute of Xuji Group Co,Beijing 100085,China)  
In order to reduce system energy losses, improve power factor and guarantee voltage quality for the end-users, an integrated model and its solution method for the optimal reactive power and voltage control problem considering time-varying load demand in distribution systems are proposed. To reduce the complexity of the problem, the system load curve is divided into several segments. According to the system load curve's changing trend, the division process is conducted as the following two steps: the system load curve is divided preliminary in the light of its monotonicity, then the segments combination method is adopted to assure the number of load segments is less than the maximum allowable number of switching operations in a day for main transformer on-load tap changer (OLTC) and shunt capacitor banks. The particle swarm optimization (PSO) is used to find a proper combination of OLTC positions and capacitor banks on/off switching operations in a day. Results from numerical examples indicate that the proposed method can not only consider the cycle changing of system load, but also make the control scheme more succinct and effective.
【CateGory Index】: TM714.3
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