摘要
首先介绍了变流器在??坐标系的离散化数学模型,在此基础上,电流内环采用无差拍控制(deadbeat control,DBC)方法跟踪电流。在实际系统中,由于电感偏差的存在,将影响系统的稳定性;同时,电流采样误差不可避免,将影响电流的控制精度。利用DBC模型在z域的传递函数,分析了系统的稳定性及动态性能。提出了一种改进DBC方法,既能提高系统对电感偏差程度适应性和系统的稳定裕度,又能较好地抑制电流采样误差以提高系统的干扰抑制能力。最后,搭建了三相变流器的实验平台,完成相关实验,验证了所提出控制方法的有效性。
The discrete time mathematical model in αβ frame of a converter was described firstly. Then, on the basis of the model, deadbeat control （DBC） method was adopted to track reference currents for inner current loop. However, in an actual system, the inductance variation will affect the stability of system. Meanwhile, sampling errors of currents are inevitable, which will influence the control accuracy of currents. The capability and the dynamic performance of the system were analyzed by using the transfer function of DBC in z-domain. An improved DBC method was proposed, which can not only improve the system stability margin and the adaptability of inductance variation degrees, but also suppress the sampling errors to improve the ability of the interference suppression for system. Finally, the experimental setup of a converter was built, and then the effectiveness of the improved DBC method is verified by experimental results.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2017年第8期2370-2382,共13页
Proceedings of the CSEE
关键词
变流器
电流内环
无差拍控制
电感偏差
采样误差
干扰抑制
converter
inner current loop
deadbeat control
inductance variation
sampling errors
interference suppression
