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《Transactions of China Electrotechnical Society》 2006-09
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Optimal Time-Varying Coordinated Optimization in Distribution Systems

Fang Xing1 Guo Zhizhong2 (1. Changsha Electric Power Supply Bureau Changsha 410015 China 2. Harbin Institute of Technology Harbin 150001 China)  
An integrated model and its solution for the coordinated optimization problem considering time-varying load demand in distribution systems are proposed in this paper. 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 control devices. In each segment, the equivalent loads are adopted to determine the optimal states for the control devices. To reduce the complexity of the coordinated optimization problem, it is decomposed into network reconfiguration and reactive power/voltage control subproblems, and uses an iterative process between these two subproblems. For network reconfiguration, an improved moment method is adopted. For reactive power/voltage control problem, particle swarm optimization (PSO) algorithm is used to find a proper combination of main transformer on-load tap changer (OLTC) positions and capacitor banks on/off switching operations. 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
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