基于动态特性对称补偿的并网变流器稳定控制方法  

Stability Control Method for Grid-connected Converters Based on Symmetric Compensation of Dynamic Characteristics

作　　者：张思缘 李梦 李少林 张学广[1] 徐殿国[1] ZHANG Siyuan;LI Meng;LI Shaolin;ZHANG Xueguang;XU Dianguo(School of Electrical Engineering and Automation,Harbin Institute of Technology,Harbin 150001,Heilongjiang Province,China;China Electric Power Research Institute,Haidian District,Beijing 100192,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江省哈尔滨市150001 [2]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2021年第5期1648-1657,共10页Power System Technology

基　　金：国家重点研发计划项目(2018YFB0904000);国家自然科学基金项目(51977046);国家电网有限公司科技项目(SGJB0000TKJS1801242)。

摘　　要：并网变流器矢量控制结构是非对称的,因此会带来稳定性问题。在建立复矢量阻抗模型的基础上,针对锁相环对q轴动态特性的影响,提出了采用q轴前馈和d轴补偿控制方法来减小锁相环的不对称影响。同样,由于直流电压控制主要影响d轴电流参考,提出了一种d轴前馈和q轴补偿的方法来改善直流电压控制器引入的不对称动态特性。考虑到所提出的对称控制方法会影响原系统的频率特性,使用所提出的复矢量阻抗模型对前馈和补偿方法进行分析,得到了对原系统影响最小的控制方法。当采用所提出的方法时,消除了耦合项中由锁相环和直流电压控制器所引入的分量,从而达到提高系统稳定性的目的。理论分析和实验结果表明该方法是有效的。The asymmetrical vector control structure of the grid-connected converter leads to harmonic instability.In this paper,for the phase-locked loop(PLL)mainly affects the q-axis dynamics,it is proposed that the q-axis feedforward and the d-axis compensation control methods are adopted to decrease the asymmetric influence caused by the PLL based on the established complex signal impedance model.Similarly,for the DC-link voltage controller mainly affects the d-axis current reference,this paper proposes a d-axis feedforward and q-axis compensation method to improve the asymmetry dynamics introduced by the dc-link voltage controller.Considering that the proposed symmetrical control method will affect the frequency characteristics of the original system,the complex signal impedance model is used to analyze the feedforward and compensation method,obtaining the control method that has the least effect on the frequency characteristic of the original system.When the proposed methods are adopted,the components introduced by the PLL and the dc-link voltage controller in the coupling terms are eliminated,thereby improving the system stability.The theoretical analysis and the experimental results show that the proposed methods are effective.

关 键 词：并网变流器 矢量控制结构 阻抗模型 稳定性分析 对称控制 

分 类 号：TM614[电气工程—电力系统及自动化]