基于频率超前校正的VSG并联系统有功振荡抑制策略  

Active power oscillation suppression strategy for VSG parallel systems based on frequency leading correction

作　　者：苗长新[1] 赵文鹏 刘家明 祝宇航 牛作虎 李彪[1] MIAO Changxin;ZHAO Wenpeng;LIU Jiaming;ZHU Yuhang;NIU Zuohu;LI Biao(School of Electrical Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学电气工程学院,江苏徐州221116

出　　处：《电力系统保护与控制》2024年第15期24-35,共12页Power System Protection and Control

基　　金：国家自然科学基金项目资助(62076243)。

摘　　要：针对虚拟同步发电机(virtual synchronous generator,VSG)在外界扰动时存在的有功暂态振荡问题,提出一种基于频率超前校正的VSG并联系统有功振荡抑制策略。首先,建立VSG并联系统有功环小信号模型,分析负载功率突变时的VSG有功振荡机理。然后,基于微分超前校正思想并结合VSG有功环控制结构,将有功功率反馈至频率偏差之上,从而增大系统阻尼程度并抑制VSG并联系统有功暂态振荡。接下来,建立改进型VSG并联系统状态空间模型,通过根轨迹分析系统动态响应性能。最后,通过Matlab/Simulink仿真和实验验证了该方案能够有效抑制VSG并联系统有功暂态振荡,并且不影响其稳态有功特性。There is an active power transient oscillation problem in a virtual synchronous generator(VSG)when there are external disturbances.This paper proposes an active power oscillation suppression strategy for a VSG parallel system based on frequency lead correction.First,a small signal model is established for the active power loop of the VSG parallel system and the VSG active power oscillation mechanism is analyzed when the load power suddenly changes.Then,based on the differential advance correction idea and combined with the VSG active power loop control structure,the active power is fed back to the frequency deviation,thereby increasing the system damping degree and suppressing the transient oscillation of the VSG parallel system active power.Next,an improved VSG parallel system state space model is established and the dynamic response performance of the system through root locus analysis is analyzed.Finally,Matlab/Simulink simulation and experimental verification show that the proposed scheme can effectively suppress transient active power oscillation in a VSG parallel system without affecting their steady-state active power characteristics.

关 键 词：虚拟同步发电机 有功振荡 超前校正 状态空间模型 根轨迹分析 

分 类 号：TM341[电气工程—电机]