转速因素影响暂态稳定机理分析

Mechanism analysis of speed variations influence on transient stability simulation

发电机模型是影响暂态稳定仿真结果的重要因素之一,其转矩方程中转速变化的简化处理在某些情况下会对暂态稳定计算产生较大影响。通过分析比较指出扩展等面积准则(EEAC)在此问题研究中的独特优势;指出了转速因素影响暂态稳定的两种表现途径;提出依据等值两群转速与同步转速的关系将受扰系统进行分类的方法,清晰地揭示了转矩方程中转速因素影响暂态稳定性的内在机理。算例仿真验证了理论分析的正确性。

Generator model is an important aspect of affecting transient stability assessment, and the simplifications of speed variations in its torque equation may cause great influences on transient stability simulation. The outstanding advantages of extended equal area criterion (EEAC) in the studies are emphasized with analysis and comparison. Two different modes of the influences are also pointed out. By classifying post-fault systems into five groups according to the relationship of synchronous speed and equivalent two-machine speed, a method is presented to analyse the mechanism of the influence. Numerical simulation results verifies the correctness and the effectiveness of this proposed method.