基于功率微分项的双VSG有功功率振荡抑制策略  

Active power oscillation suppression strategy for dual-VSG grid based on power differential term

作　　者：朱军[1] 袁亚飞 刘鹏辉 杜少通[1] 郭向伟 杨明[1] 曲玉博 ZHU Jun;YUAN Yafei;LIU Penghui;DU Shaotong;GUO Xiangwei;YANG Ming;QU Yubo(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China;XJ Electric Co.,Ltd,Xuchang 461000,China)

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454000 [2]许继电气股份有限公司,河南许昌461000

出　　处：《电机与控制学报》2024年第1期177-188,共12页Electric Machines and Control

基　　金：国家自然科学基金(U1504506);河南省科技攻关项目(202102210093,212102210256);河南省高等学校青年骨干教师培养计划项目(2020GGJS055);河南理工大学青年骨干教师培养计划项目(2018XQG-08)。

摘　　要：针对虚拟同步发电机(VSG)双机并联运行时产生的有功功率振荡问题,通过建立双VSG系统的小信号模型,分析了有功功率振荡产生的机理,提出一种基于改进虚拟阻抗的瞬态功率均分策略和一种基于功率微分项的自适应惯量和阻尼的功率振荡抑制策略,将有功功率微分项与角加速度结合起来实现惯量的自适应调节,同时将有功功率微分项引入阻尼控制环节以替代传统的阻尼项,实现阻尼的自适应调节。所提出的策略可以使动态时VSG之间的角频率差更快速地趋近于零,从而减小有功功率振荡的超调,改善频率动态响应性能。搭建了VSG并联的仿真模型,仿真结果表明:所提改进控制策略可以使瞬态时实现有功均分,使动态时的有功功率振荡超调减小41%,振荡过程减小了1秒。Aiming at the active power oscillation problem generated when the virtual synchronous generator(VSG)is operated in parallel,the mechanism of active power oscillation was analyzed by establishing a small-signal model of the dual VSG system,and a transient power equalization strategy based on the improved virtual impedance and a power oscillation suppression strategy based on the power differential term with adaptive inertia and damping were proposed to realize the combination of the active power differential term with angular acceleration to achieve the adaptive regulation of inertia,while the active power differential term was introduced into the damping control link to replace the conventional damping term to realize the adaptive regulation of damping.The proposed strategy can make the angular frequency difference between the VSGs converge to zero more quickly during the dynamic time,so as to reduce the overshoot of the active power oscillation and improve the frequency dynamic response performance.A simulation model of VSGs connected in parallel was constructed,and the simulation results show that the proposed improved control strategy can realize active equalization in transient state,reduce the overshoot of active power oscillation by 41%and the oscillation process by 1 second in dynamic state.

关 键 词：虚拟同步发电机 功率微分项 自适应惯量 阻尼 功率振荡抑制 功率均分 

分 类 号：TM46[电气工程—电器]