基于改进广义导抗法的独立电力系统静态稳定性分析

Steady-State Stability Analysis of Isolated Power System Based on Improved Generalized Immittance Method

系统稳定性是独立电力系统设计和运行时需要被重点考虑的因素。由于现有稳定性判据的保守性,使得独立电力系统在设计时为保证稳定运行而付出了更多代价,对电力电子装置级联的条件提出了更严格的限制。为此提出同时考虑增益裕度约束和相位裕度约束的改进广义导抗稳定性分析方法,推导了具有更小禁止域的稳定性判据,用以计算多运行点系统的电源广义阻抗约束集和负载广义导纳集。以某同步整流发电机带恒功率负载的独立电力系统为例,验证了所提出的稳定性分析方法的正确性。与现有方法相比,该方法有效降低了保守性,提高了分析精度。

Stability is an important element to be considerated in the design and analysis of isolated power system. Due to the conservatism of the existing stability criterion,which makes the isolated power system cost a lot for stable operation. Tighter restrictions are also put forward for system cascade. In this paper,consider the gain margin and phase margin constrain at the same time and deduce the stability criterion with smaller forbidden region to calculate generalized impedance constraint set and generalized load admittance set of the multi operating point system. An isolated power system consisting of a synchronous machine with a rectifier as a source and a constant power as load is analyzed by using the proposed method and which compared with existing method shows it can get more accurate results and reduced conservatism effectively.