同步发电机整流系统带恒功率负载的稳定性分析

 在现代飞行器电源系统负载中,功率变换器和电动机驱动装置大量增加,所表现出的负阻抗特性对系统稳定性产生十分重要的影响。采用状态空间平均法对同步发电机整流系统带恒功率负载(CPL)的稳定性进行了分析研究。建立了同步发电机整流系统同时带阻性负载和恒功率负载时的小信号数学模型,通过讨论负载参数对系统稳定性的影响,得到系统带恒功率负载时的极限值和稳定工作区域,所设计的串联校正环节在一定程度上改善系统响应快速性的同时,使系统的相角裕度增加了53°,有效地提高了系统的稳定性。

Stability Analysis of Synchronous Generator-rectifier Systems with Constant Power Loads

With the drastic increase of the use of electronic power converters and electric motor drivers in modern aircraft power supply systems, their negative impedance characteristics are found to seriously affect system stability. This article analyzes the stability of a synchronous generator-rectifier system with constant power loads (CPLs) by the state-space averaging method. Small signal models of the synchronous generator-rectifier systems with concurrent resistance and constant power loads are established. Considering the effect of the load parameters upon system stability, the limit value and stable operating areas of the system with constant power loads are obtained. The phase margin of the system is increased by 53°, and the stability is obviously enhanced by the designed series correction, meanwhile, the response speed of the system is to some extent improved.