基于阻抗检测的直流微网自适应稳定控制策略  

Adaptive Stability Control Strategy of DC Microgrid Based on Impedance Detection

作　　者：周继林 赵晋斌 曾志伟 徐炅渊 ZHOU Ji-lin;ZHAO Jin-bin;ZENG Zhi-wei;XU Jiong-yuan(Shanghai University of Electric Power,Shanghai 200090,China)

机构地区：[1]上海电力大学,电气工程学院,上海200090

出　　处：《电力电子技术》2023年第6期97-99,129,共4页Power Electronics

基　　金：国家自然科学基金(52177184);上海市科学技术委员会项目(21DZ1207502)。

摘　　要：在直流微网中,电压控制单元的输出侧电容与线路等效电感相互作用将会引起系统失稳,恒功率负载的接入将加剧系统失稳,采用有源阻尼控制可以解决这个问题。由于源网荷的交互作用,每个电压控制单元的合理有源阻尼控制参数在不同线路等效电感组合下存在差异,不合理的有源阻尼控制参数将减小系统稳定裕度。为了解决直流微网中变化的线路等效电感对稳定裕度的影响,基于直流微网系统结构特点,此处讨论了线路等效电感和控制参数之间的优化关系,提出一种基于电压控制单元输出电压和电流纹波的线路等效电感检测方法,实现了应对不同线路等效电感的自适应有源阻尼控制。最后,通过半实物仿真实验平台验证了上述控制方法的正确性。In the DC microgrid,the interaction between the output capacitor of the voltage control unit and the line equivalent inductance will cause system instability,and the connection of constant power load will aggravate the system instability.Active damping control can solve this problem.Due to the interaction of source and grid loads,the reasonable active damping control parameters of each voltage control unit are different under different line equivalent inductance combinations,and the unreasonable active damping control parameters will reduce the system stability margin.In order to solve the influence of the changing equivalent inductance of the line in the DC microgrid on the stability margin,based on the structural characteristics of the DC microgrid system,the optimal relationship between the equivalent inductance of the line and the control parameters is discussed,a method for detecting the equivalent inductance of the line based on the output voltage and current ripple of the voltage control unit is proposed,and the adaptive active damping control for different equivalent inductances of the line is realized.Finally,the correctness of the above control method is verified by the hardware in the loop simulation experimental platform.

关 键 词：微网 有源阻尼 线路等效电感 自适应稳定控制 

分 类 号：TN819.1[电子电信—信息与通信工程]