小型同步发电机组并联运行稳定性的探讨

Analysis of the stability of small synchro generator sets operating in parallel

采用小扰动法、等面积法和改进欧拉法对多台小型同步发电机组并联运行供电系统稳定性进行了探讨。根据不同的干扰程度 ,分析研究了系统的静态稳定性和暂态稳定性。当多台机组满足特性相同、阻抗和结构标幺值相同及惯性时间常数相等时 ,其调压、调速系统特性及结构相同 ,保护装置切除故障时间小于极限切除时间的条件时 ,并联运行系统具有静态稳定性和暂态稳定性 ,并给出了提高稳定性的措施。

The stability of the power supply system in which the multiple small synchro generator sets operate in parallel is investigated through little excitation analysis, power characteristic curve analysis and equal surface analysis. The static and transient stability of the power system are analyzed based on the degree of excitation. When the mutiple sets have the same characteristics and inertial time constant,the same nominal values of impedance and constitution and the same structure and characteristics in the regulation system of voltage and speed,and the operating time of the protective device is shorter than its limit debugging time,the power system can keep the static stability and transient stability. In addition, the ways of increasing the stability are presented.