摘要
互联电网中的严重故障可引起联络线功率波动,它通常是全网不同节点的频率分布差异造成的。为了研究大型电力系统中的功率波动现象,提出一种基于模式动力学分析的新方法。首先通过空间坐标变换将线性化系统分解为独立的模式。然后引入角动量与模式能量来刻画模式运动的特征。这样可以通过标准的矩阵运算步骤得到模式运动引起的功率波动幅值。进而推导得出等速原理与功率正交原理这两个模式动力学的基本原理。通过对两机系统的举例推导和对实际大型电力系统的详细计算分析结果,验证了提出的方法与结论。
After disturbances tie-lines of the interconnected power grid are subjected to power fluctuations, which are usually the result of frequency distribution of the nodes in the whole system. In order to study the power fluctuation in large-scale power systems, a novel method based on modal dynamics（MD） analysis was proposed in this paper. Firstly the linearized system was decomposed into independent modes under the transformation of spatial coordinates. Then the angular momentum and modal energy were introduced to characterize the movement of mode in depth. Thus the amplitude of power fluctuations dominated by modal movement was obtained via the standard procedure of matrix calculations. Furthermore, the principle of equal velocity and the principle of orthogonal powers are revealed as two fundamental principles of modal dynamics. Finally the proposed method and conclusions are exampled by the deduction of a 2-machine system, and verified by the analysis and simulation of a large-scale power system in operation.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第3期624-632,共9页
Proceedings of the CSEE
关键词
功率波动
模式动力学分析
等速原理
功率正交原理
power fluctuation
modal dynamics analysis
principle of equal velocity
principle of orthogonal powers
