A study of system splitting strategies for island operation of power system a two phase method based

A study of system splitting strategies for island operation of power system a two phase method based

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1556 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 18, NO. 4, NOVEMBER 2003 A Study of System Splitting Strategies for Island Operation of Power System: A Two-Phase Method Based on OBDDs Qianchuan Zhao, Kai Sun, Da-Zhong Zheng, Jin Ma, and Qiang Lu , Fellow, IEEE Abstract— System splitting problem, also known as controlled system separation problem, is to determine the proper splitting points for splitting the entire power network into islands when island operation of system is unavoidable. By “proper” we mean that the splitting strategies should guarantee both the power bal- ance and satisfaction to capacity constraints of transmission lines and other facilities in each island. The system splitting problem is very hard because the strategy space is huge for even middle-scale power networks. This paper proposes a two-phase method to search for proper splitting strategies in real-time. The method nar- rows down the strategy space using highly efficient OBDD-based algorithm in the first phase, then finds proper splitting strategies using power-flow analysis in the reduced strategy space in the second phase. Simulation with symbolic model checking tool SMV indicates that this method is very promising. Index Terms— Graph theory, island operation, OBDD, system splitting, splitting strategy. I. INTRODUCTION S YSTEM splitting, also known as controlled system sepa- ration, is to split an interconnected transmission network into islands of load with matched generation at proper splitting points by opening selected transmission lines. Applied together with load shedding and perhaps generator dropping, each island of load and generation would theoretically remain in balance, thus avoiding cascading instability or even blackout of the en- tire system. The studies of historic blackouts or outages, such as the November 9, 1965, Northeast USA power interruption [1], the blackout of New York’s power in July 1977[2], the July 2, 1996, cascading outage of Western USA power system [3], the Brazilian blackout on March 11, 1999[4], etc., show that if proper system splitting combined with load shedding and gen- erator dropping had been performed in time, some blackouts should have been avoided and much of the losses should have been reduced. Active and viable system splitting can efficiently avoid blackout of the entire power system and is typically better than passive system islanding. One reason is that after split- Manuscript received January 28, 2003. This work was supported in part by NSFC under Grant 60074012 and Grant 60274011, and in part by the National Fundamental Research Funds under Grant G1998020310, Ministry of Educa- tion of China and Tsinghua University project. Qianchuan Zhao, Kai Sun, and Da-Zhong Zheng are with the Center for In-
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A study of system splitting strategies for island operation of power system a two phase method based

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