含电流限幅器的逆变器暂态稳定性评估方法  

Evaluation Method for Transient Stability of Inverter Containing Current Limiter

作　　者：赵峰[1] 帅智康[1] 彭也伦 沈超 程慧婕 沈阳[1] ZHAO Feng;SHUAI Zhikang;PENG Yelun;SHEN Chao;CHENG Huijie;SHEN Yang(National Engineering Research Center for Power Conversion and Control(Hunan University),Changsha 410082,Hunan Province,China)

机构地区：[1]国家电能变换与控制工程技术研究中心(湖南大学),湖南省长沙市410082

出　　处：《中国电机工程学报》2021年第6期2245-2254,共10页Proceedings of the CSEE

基　　金：国家自然科学基金面上项目(51977066)。

摘　　要：大扰动条件下,用于抑制逆变器故障冲击电流的电流限幅器可能引起逆变器发生暂态功角失稳。但限幅器使得逆变器的模型存在连续不可导运行点,导致无法评估逆变器暂态稳定性。针对这一问题,文中提出一种含电流限幅器的逆变器暂态稳定性评估方法。以下垂逆变器为例,构建含限幅器的下垂逆变器的能量函数,并刻画逆变器的稳定域,最后基于RTLAB实验平台验证了所提方法用于逆变器暂态稳定性评估的有效性。Under the condition of large disturbance, the current limiter is used to suppress the inverter’s fault impulse current, which may cause transient power angle instability of the inverter. However, the limiter makes the model of the inverter have a continuous nondifferentiable operating point, which makes it can’t beimpossible to be used to evaluate the transient stability of the inverter. To solve this problem, a transient stability evaluation method for inverter with current limiter was proposed in this paper. A droop-controlled inverter was taken as an example to construct the energy function of the inverter with a limiter and the stability domain of the inverter was depicted. Finally, based on RTLAB platform, the effect of the proposed method for evaluating inverter’s transient stability was verified.

关 键 词：下垂逆变器 电流限幅器 暂态功角稳定性 稳定性评估 

分 类 号：TM46[电气工程—电器]