基于改进功率控制环的VSG优化控制方法  

VSG Optimal Control Method Based on Improved Power Control Loop

作　　者：李练兵 何桂欣 贾学岩 范辉 胡文平 赵治国 LI Lian-bing;HE Gui-xin;JIA Xue-yan;FAN Hui;HU Wen-ping;ZHAO Zhi-guo(School of Artificial Intelligence and Data Science,Hebei University of Technology,Tianjin 300130,China;State Grid Hebei Electric Power Research Institute,Shijiazhuang 050000,China;Tianjin Kelin Electric Co.,Ltd.,Tianjin 300130,China)

机构地区：[1]河北工业大学人工智能与数据科学学院,天津300130 [2]国网河北省电力有限公司电科院,河北石家庄050000 [3]天津科林电气有限公司,天津300130

出　　处：《控制工程》2023年第3期385-392,共8页Control Engineering of China

基　　金：河北省省级科技计划基金资助项目(20314301D)。

摘　　要：由于微网中分布式电源无法像同步发电机(SG)一样为系统提供惯性及阻尼,导致系统出现低惯量和弱阻尼特征。通过虚拟同步机(VSG)控制方法可使并网逆变器具有SG的调频调压特性。因此,提出一种基于改进功率控制环的虚拟同步机优化控制方法。首先,建立了含VSG的微网系统结构模型,设计了VSG的功率外环控制方案。然后,在有功环设计超前滞后环节,用于解决传统VSG的惯量阻尼控制不能兼顾系统的动态响应速度和静态控制精度的矛盾;在无功环设计修正环节,用于补偿传统VSG控制中功率耦合对无功功率响应速度的影响,以提高无功功率的动态响应速度,抑制有功功率及无功功率振荡。最后,在MATLAB中建立了微网仿真模型并进行验证,证明了所提控制方法的有效性。Due to the access of high proportion of new energy in microgrid,distributed generation cannot provide inertia and damping for the system like synchronous generator(SG).The system has low inertia and weak damping characteristics,which has a great impact on the frequency and voltage stability of the system.The virtual synchronous machine(VSG)can make the grid connected inverter perform the frequency modulation and voltage regulation characteristics of the synchronous machine through control.Therefore,an optimal control method of VSG based on improved power control loop is proposed.The structure model of microgrid with VSG is established,and the control schemes of outer power loop and inner voltage and current loop of VSG are designed.In the active power loop,the lead lag link is designed to solve the contradiction between the dynamic response speed and the static control accuracy of the traditional VSG inertia damping control;in the reactive power loop,a correction link is designed to compensate for the influence of power coupling on reactive power response speed in traditional VSG control,improve the dynamic response speed of reactive power,and suppress the oscillation of active power and reactive power.Finally,the simulation model of microgrid is established in MATLAB.The simulation results verify the effectiveness of the proposed control method.

关 键 词：虚拟同步机 功率外环控制 有功频率环节 无功电压环节 调频调压 

分 类 号：TM464[电气工程—电器]