针对微网低频振荡的虚拟同步发电机阻尼控制  

Damping Control of Virtual Synchronous Generator for Low-frequency Oscillation of Microgrid

作　　者：陈杉桐 陈谦[1] 周文海[1] 刘莹[1] CHEN Shantong;CHEN Qian;ZHOU Wenhai;LIU Ying(School of Electrical and Power Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学电气与动力工程学院,南京211100

出　　处：《电力系统及其自动化学报》2024年第9期9-21,共13页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51837004)。

摘　　要：虚拟同步发电机的控制策略是基于同步机的转子摇摆方程设计,因此也存在传统电网的功率振荡问题。本文首先分析虚拟同步发电机控制环节产生的负阻尼效应,明确线路阻抗比与虚拟励磁系统在参数选取不当时可能使得系统低频稳定性降低;其次,提出一种同时补偿传递函数零点、力矩大小与相位的控制策略,并基于此策略构建虚拟阻尼力矩补偿器;接着,推导含虚拟阻尼力矩补偿器的多台虚拟同步发电机微电网系统小信号模型,并采用选择模式分析法进行振荡模式分析,根据特征根灵敏度矩阵协调设计虚拟阻尼力矩补偿器的参数;最后,搭建仿真模型验证了虚拟阻尼力矩补偿器的有效性。Since the control strategy for a virtual synchronous generator(VSG)is based on the design of rotor oscilla-tion equation for the synchronous machine,there also exists a problem of power oscillation in traditional power grids.First,the negative damping effect generated in the control link of VSG is analyzed in this paper,and it is clarified that an improper parameter selection of the line impedance ratio and virtual excitation system may reduce the low-frequency stability of the system.Second,a control strategy is proposed to simultaneously compensate for the zero point of the transfer function and the magnitude and phase of torque,based on which a virtual damping moment compensator(VD-MC)is constructed.Third,the small signal model of a multi-VSG microgrid system containing VDMC is derived,and se-lective modal analysis is used to analyze the oscillation modes.In addition,the parameters of VDMC are designed based on the characteristic root sensitivity matrix.Finally,a simulation model is built to verify the effectiveness of VDMC.

关 键 词：虚拟同步发电机 负阻尼效应 低频振荡 虚拟阻尼力矩补偿 

分 类 号：TM341[电气工程—电机] TM712