Reactive-Power Optimization Research Based on Load Fluctuation and Distributed Control

Abstract:

This paper proposes a voltage-reactive power optimization, which is an integrated system based on centralized optimization and distributed control, to confine the action numbers of control devices. The system includes VQC (voltage and reactive power control system) and the optimal power flow calculation in the master station. By using the fractal theory, the original data in the range of nonperiodic cycles are divided into several time-intervals. After this processing, the optimal points are obtained by optimal power flow in every segment. Based on the load fluctuation rate, in every period, the voltage / reactive power limits of nine area figure are set. As the load fluctuation rates changed in every segment, voltage / reactive power limits are different. And the tap changers and switchable capacitor banks are regulated according to each upper/lower limits and the optimal points. Furthermore, correctness and effectiveness of the proposed method have been confirmed. And the simulation results show that it not only reduces power losses but also restricts the action numbers of control device.

• Periodical: Advanced Materials Research (Volume 711)
• Pages: 408-415
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.711.408
• Online since: June 2013
• Authors: Wen Dou, Xin Gong Cheng, Xi Ju Zong, Xing Hua Pei
• Keywords: Divided-Period, Load Fluctuation Rate, Times of Control Action, Voltage-Reactive Power Optimization

References

[1] Bie Zhaohong, Song Yonghua, Wang Xifan. Integration of Algorithmic and Heuristic Techniques for Transition-optimised Voltage and Reactive Power Control [J].IEE Proceedings:C Generation, Transmission and Distribution,2006,153(2):205-210.

DOI: 10.1049/ip-gtd:20050019

[2] Lu F C,Hsu Y Y.Fuzzy Dynamic Programming Approach to Reactive Power/Voltage Control in a Distribution Substation[J]. IEEE trans on Power Systems,1997,12(2):681-688.

DOI: 10.1109/59.589651

[3] Youman Deng,Xiaojuan Ren,Changcheng Zhao. A Heuristic and Alogorithmic Combined Approach for Reactive Power Optimizition with Time-varying Load Demand in Distribution Systems[J]. IEEE Trans on Power Systems,2002,17 (4):1068-1072.

DOI: 10.1109/tpwrs.2002.804973

[4] Edgar E. Peters . Fractal Market Analysis [M].New York: John Wiley&Sons.Inc.1994:86-103.

[5] Chao Huang, Qinglie Wu, Zhong Wu, and Yangyong Zhu, Clustering Financial Time Series Based on Multi-fractal Features of Variance Volatility, Systems Engineering, vol. 24, no.6,pp.100-103,June2006.

[6] Peters.E. Fraetal Stureture in the Cpaital Market.Finnaeial Analysts Journal,1989,52(3):131-137.