Power System Transient Frequency Stability Assessment Considering Unit Underfrequency Relay Protection
Li Changgang1, Zhang Hengxu1, Liu Yutian1, Sun Huadong2, Tang Yong2
1. Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University) Ministry of Education Jinan 250061 China; 2. China Electric Power Research Institute Beijing 100192 China
Abstract：Frequency stability is the ability of a power system to maintain steady frequency during severe system upset. Mechanism of transient frequency instability is discussed. Unit tripping due to underfrequency relay may worsen active power imbalance and is treated as a necessary condition of transient frequency instability. A transient frequency stability index with fine linearity is defined with critical disturbance of unit underfrequency relay. Considering spinning reserve and underfrequency load shedding, an analytic model of frequency response is deduced for fast evaluation of transient frequency stability with reasonable simplification of turbine-governor system. Simulations show that system transient frequency stability can be evaluated with the proposed method quickly and effectively.
李常刚, 张恒旭, 刘玉田, 孙华东, 汤涌. 考虑机组低频保护的电力系统暂态频率稳定评估[J]. 电工技术学报, 2013, 28(2): 271-278.
Li Changgang, Zhang Hengxu, Liu Yutian, Sun Huadong, Tang Yong. Power System Transient Frequency Stability Assessment Considering Unit Underfrequency Relay Protection. Transactions of China Electrotechnical Society, 2013, 28(2): 271-278.
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2013, Vol. 28 
