基于WAMS和奇异熵矩阵束方法的电网低频振荡仿真分析

Power Grid Low Frequency Oscillation Simulation Analysis Based on WAMS and Singular Entropy Matrix Pencil Method

分析了用传统的小干扰稳定分析方法研究互联大电网运行特性时存在的不足,提出了基于广域测量系统(WAMS)和奇异熵矩阵束方法的综合分析法。该方法将奇异熵用于模态阶数的提取,既能在有无噪声的情况下都准确确定模态阶数,又能减少计算复杂度。以华中电网2009年6月17日发生的由金竹山B厂开关爆炸导致的电网功率波动事件为例,对比了小干扰稳定分析方法和所提出的综合分析法的仿真分析结果。结果表明,基于WAMS和奇异熵矩阵束方法的综合分析法是以特征值分析法为代表的传统低频振荡分析方法的有效补充,能够较为准确、及时、全面地反映电网的振荡特性,为分析由多重扰动引起的或特殊运行方式下的低频振荡现象提供了有效手段。

The disadvantages of traditional small signal stability analysis method are analyzed for interconnected large-scale power system,and the combined analysis method based on WAMS and singular entropy matrix pencil is proposed. Singular entropy is applied to determine the mode order in the proposed method. It can determine mode order accurately regardless of the existence of noises. It also can reduce the computational complexity. Taking the power fluctuation incident which was resulted from switch explosion on June 17th 2009 in the Central China Grid as an example,the results of conventional small signal stability analysis method and the proposed method are compared. The simulation results show that the proposed method is a potential supplement for the traditional low frequency oscillation analysis method,and can reflect the oscillation characteristics with higher precision in timely and more comprehensively. It is an effective method for studying low-frequency oscillation resulting from multiple disturbances or some special operation mode.