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中文摘要：
为了研究电力系统连锁故障发生的机理及相应的预防和控制措施,提出一种简单而实用的确定性模型以分析连锁故障中的短期频率动态行为,同时也充分考虑了机组频率保护、低频减载装置以及元件切除时间的随机性对频率动态的影响.对某实际系统进行了仿真研究,验证了模型的演化过程符合自组织临界特性.分析了不同的频率模型、起始扰动规模、旋转备用以及低频减载方案对频率动态过程、停电规模及其概率的影响,仿真结果表明,一次备用、较大的起始轮次切载量、一定的旋转备用有助于降低发生频率崩溃的风险.
英文摘要：
In order to study the mechanism of power system cascading outage and its preventive control measures,a simple deterministic frequency dynamic model was developed together with its stochastic counterpart. The impacts of generator frequency protection,under-frequency load shedding （UFDL） and their tripping time on the frequency dynamic progress were fully considered in the model. Simulation of a practical system confirmed,the power law distribution of the power system blackout size. The influences of some factors,such as frequency model,initial disturbance size,spinning reserve and UFDL scheme,on the frequency dynamic progress,blackout size and its probability were also discussed. Simulation shows that primary regulation,more load shedding in the first round of UFDL and proper spinning reserve are helpful to enhance the frequency stability.
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