基于虚拟电力系统稳定器的低频振荡抑制策略  

Low frequency oscillation suppression strategy based on virtual power system stabilizer

作　　者：王海鑫[1] 何海文 刘铭崎 杨子豪 郝炎 杨俊友[1] 陈哲[2] WANG Haixin;HE Haiwen;LIU Mingqi;YANG Zihao;HAO Yan;YANG Junyou;CHEN Zhe(School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China;Department of Energy Technology,Aalborg University,Aalborg DK-9220,Denmark)

机构地区：[1]沈阳工业大学电气工程学院,辽宁沈阳110870 [2]丹麦奥尔堡大学能源技术系,奥尔堡丹麦DK-9220

出　　处：《电机与控制学报》2024年第5期82-90,100,共10页Electric Machines and Control

基　　金：高等学校学科创新引智计划(D23005);国网辽宁省电力有限公司"揭榜挂帅"科技攻关项目(2021YF-82);辽宁省教育厅科技项目(LQGD2019005)。

摘　　要：基于虚拟同步发电机(VSG)控制的新能源机组虽可增强电网惯量及频率稳定性,但可能继承与同步机类似的低频振荡问题。针对该问题,首先基于单台VSG并网的线性化模型,构建了适用于VSG的Phillips-Heffron模型,借助阻尼转矩法挖掘了VSG低频振荡的诱发机理。进一步提出一种附加于VSG无功环节的虚拟电力系统稳定器(VPSS),并给出了控制结构及基于相位补偿法的参数设计过程。研究结果表明:VSG发生低频振荡是由于系统受扰后,虚拟功角的振荡信号经过虚拟励磁调节器对VSG机电振荡回路产生了负阻尼转矩。将所提VPSS接入系统可在几乎不影响振荡频率的前提下,实现0.1~3 Hz下VSG低频振荡的有效抑制。Although renewable energy sources controlled by virtual synchronous generator(VSG)could enhance the inertia and frequency stability of the power grid,they may inherit the low-frequency oscilla-tion problem similar to synchronous generator.To address this issue,the Phillips-Heffron model suitable for VSG was constructed at first based on the linearized model of single VSG connected to the grid,and the induction mechanism of low-frequency oscillation of VSG was explored by the damping torque meth-od.Furthermore,a virtual power system stabilizer(VPSS)integrated into the reactive power link of VSG was proposed,and the control structure and parameter design process based on phase compensation meth-od were given.The research results show that low-frequency oscillation of VSG was caused by the nega-tive damping torque of electromechanical oscillation circuit of VSG generated by the oscillation signal of virtual power angle through the virtual excitation regulator after system disturbed.The low-frequency os-cillation of VSG at 0.1-3 Hz could be suppressed effectively after VPSS integrated into the system with-out the oscillation frequency was affected.

关 键 词：虚拟同步发电机 虚拟电力系统稳定器 低频振荡 阻尼转矩分析 相位补偿法 

分 类 号：TM761[电气工程—电力系统及自动化]