Research on transient voltage stability analysis based on controlling UEP method
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摘要: 文章提出了一种基于主导不稳定平衡点分析电力系统暂态电压稳定性的方法。采用启发式的方法，得到电力系统中计算电压型主导不稳定平衡点的初值，同时引入牛顿同伦法，以降低主导不稳定平衡点对初值的敏感度，使所得到的初值可以有效收敛到电压型主导不稳定平衡点上。另外，还考虑了多电动机的动态负荷模型，并通过大扰动下的电压薄弱节点识别寻得主导负荷母线，提升了该启发式方法的模型适用性与推广性。结合能量函数与得到的主导不稳定平衡点，能有效求取多机系统暂态电压失稳的临界切除时间。最后在3机9母线系统上验证了该方法的有效性。Abstract: A method based on controlling UEP method to analyze the transient voltage stability of power system is proposed in this paper. The heuristic method is employed to get the initial value of controlling UEP which is related to voltage stability of power system in the first step. Then, a Newton homotopy method is introduced so as to reduce the sensitivity of dominant unstable equilibrium point to initial values, which means that the proposed initial value can converge to the dominant unstable equilibrium point effectively. In addition, the dynamic load model of multiple motors is considered, and the dominant load bus is found by identifying the weak voltage node under large disturbance, which improves the applicability and extensibility of the heuristic method. Combined with the energy function and the controlling UEP, the critical clearing time of transient voltage stability of multi-machine system can be obtained with an acceptable engineering accuracy. Finally, the feasibility and effectiveness of the proposed method is illustrated on the three-machine nine-bus system.
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