高比例电力电子电力系统稳定性的统一性判据研究(二):区域稳定判据

Research on Unification Stability Criterion for the Power Electronics Dominated Power System(Ⅱ):Criterion of the Power-electronic Interfaced Subsystem

电力电子电源场站与交流电力系统及其他电力电子电源场站间的复杂交互作用,使得基于单机和单场站思想的稳定性评估方法存在失效风险,引发了电网稳定运行的安全隐患。针对上述问题,提出一种对高比例电力电子电力系统中区域稳定性评估的统一性稳定判据。首先,该文提出区域动态统一性稳定指标(unification stability index of dynamic state,USI_(1))和区域静态统一性稳定指标(unification stability index of static state,USI_(2))的定义与计算方法,并详细论述了其理论依据与物理含义;其次,提出基于相对增益矩阵(relative gain array,RGA)理论和统一性稳定指标的高比例电力电子电力系统稳定性评估方法;再次,提出由USI_(1)、USI_(2)和R_(RGA)组成的稳定性评估指标体系,构建了从场站扩展到区域、进而延伸到电力系统的稳定性评估框架;最后,实例验证了该文方法在高比例电力电子电力系统稳定性评估中的有效性。

The interaction,existing between the plant and other components of power system,seriously affects the characteristics of power system and causes a fatal risk.To fill the gap,a unification stability criterion for the power electronics dominated power system was proposed in this paper.Firstly,the definition and calculation method on unification stability index of dynamic state(USI_(1))and unification stability index of static state(USI_(2))were expressed,and their theoretical basis and physical meaning were discussed in detail.Secondly,the stability assessment method for power system was proposed on relative gain array(RGA)theory and USI.Then,a three-dimensional index set was constructed to analyze the stability among plant,subsystem and power system.Finally,an example was given to verify the effectiveness of the proposed method for the power electronics dominated power system.