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| Probabilistic Assessment for Frequency Instability of Power System Based on Frequency Dynamic Characteristic |
| Zhao Yuan1, Wu Xiaoping2, Xie Kaigui1 |
| 1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China 2. Foshan Power Supply Bureau of Guangdong Power Grid Corporation Foshan 528000 China |
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Abstract An approach for frequency instability risk assessment of bulk power system is proposed in this paper. Based on the dynamic frequency characteristic of spinning reserve, the model of frequency stability analysis considering under frequency load shedding is presented. Utilizing the non-sequential Monte Carlo simulation, risk indices such as instability probability、instability frequency, expected load shedding and frequency dynamic indices are calculated for probabilistic quantitative evaluation of frequency instability. The impact of spinning reserve and generators tripping on frequency instability are discussed. Moreover, the annual risk indices including or excluding uncertainty for multi-level load model are analyzed. Simulation results of IEEE-RTS79 verify that the proposed method is a powerful tool which can provide valuable reference information for identification of frequency instability risk and optimizing of under frequency load shedding scheme.
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Received: 19 May 2010
Published: 20 March 2014
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2012, Vol. 27 
