摘要
城轨车辅助供电系统(APS)在复杂工况下实际运行时可能出现直流侧电压畸变、振荡乃至失稳等情况,使得保护措施被迫启动。为增强辅助系统在复杂工况下的稳定性,针对辅助逆变器提出了一种主动阻尼控制策略。首先建立了APS中DC/DC变换器的输出阻抗模型以及辅助逆变器的输入阻抗模型。借助Nyquist曲线,从阻抗匹配的角度分析了影响系统直流侧稳定性的因素。由广义Nyquist稳定判据(GNC)可知,DC/DC变换器与辅助逆变器的阻抗不匹配是造成电压异常的主要原因。所提控制策略通过引入主动阻尼控制能修正辅助逆变器原有的负阻抗特性,可有效提升系统的稳定性。最后,仿真和实验验证了理论和所提控制方法的有效性。
The auxiliary power system(APS)of urban rail may occur DC side voltage distortion,oscillation and even instability during actual operation under complex working conditions,so that the protection measures are forced to start.To enhance the stability of the auxiliary system under complex working conditions,an active damping control strategy is proposed for the auxiliary inverter.Firstly,the output impedance model of DC/DC converter and the input impedance model of auxiliary inverter in APS are established.By means of Nyquist curve,the factors affecting the stability of DC side are analyzed from the angle of impedance matching.According to the general Nyquist stability criterion(GNC),the impedance mismatch between DC/DC converter and auxiliary inverter is the main reason for voltage anomaly.The proposed control strategy can modify the original negative impedance characteristics of the auxiliary inverter by introducing active damping which can effectively improve the stability of the system.Finally,the effectiveness of the proposed control method is demonstrated by the simulation and experiment.
作者
周雪松
胡一凡
端木子建
田雨
ZHOU Xue-song;HU Yi-fan;DUANMU Zi-jian;TIAN Yu(Tianjin Key Laboratory for Control Theory and Application in Complicated Systems,Tianjin University of Technology,Tianjin 300384,China;不详)
出处
《电力电子技术》
北大核心
2023年第3期44-47,60,共5页
Power Electronics
基金
国家自然科学基金(51877152)
天津市研究生科研创新项目(2021YJSS090)。
关键词
辅助逆变器
主动阻尼控制
稳定性
auxiliary inverter
active damping control
stability
