基于虚拟同步机的微电网不平衡工况下改进控制策略  

Improved Control Strategy Based on Virtual Synchronous Generator Under Unbalanced Condition of Microgrid

作　　者：黄河遥 王鲁杨 吴嘉明 柏扬 丁权 白洪山 HUANG Heyao;WANG Luyang;WU Jiaming;BAI Yang;DING Quan;BAI Hongshan(College of Electrical Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Shibei Power Supply Company,State Grid Shanghai Electric Power Company,Shanghai 200431,China;Engineering Construction Consulting Company,State Grid Shanghai Electric Power Company,Shanghai 200120,China;Yuhuan Power Supply Company,State Grid Zhejiang Electric Power Company,Taizhou 317600,Zhejiang,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]国网上海市电力公司市北供电公司,上海200431 [3]国网上海市电力公司工程建设咨询分公司,上海200120 [4]国网浙江省电力公司玉环市供电公司,浙江台州317600

出　　处：《电气传动》2022年第14期45-51,58,共8页Electric Drive

基　　金：上海绿色能源并网工程技术研究中心资助项目(13DZ2251900)。

摘　　要：虚拟同步发电机技术能为微电网频率稳定提供虚拟惯量,而微电网运行时会存在大量不对称负荷,为补偿不平衡负载,输出三相对称电压电流,提出一种改进的基于虚拟同步机控制策略。在双二阶广义积分器中引入一个可调节系数λ,使输出的三相不对称电压能够准确分离出正、负序电压和电流,并提取出电压电流幅值、频率、相角信息,使输出电压达到三相平衡。电流控制采用一种基于dq坐标系的分序控制,使三相不平衡电流输出平衡。最后在Matlab/Simulink仿真平台和HIL硬件在环实验平台中通过对比传统虚拟同步控制策略和改进后虚拟同步控制策略,验证了所提控制策略的有效性和正确性。Virtual synchronous generator technology can provide virtual inertia for the frequency stability of microgrid,but there are a lot of asymmetric loads in the operation of microgrid. In order to compensate the unbalanced load and output three-phase symmetrical voltage and current,an improved control strategy based on virtual synchronous generator was proposed. An adjustable coefficient λ was introduced into the dual second-order generalized integrator,so that the positive and negative sequence voltages and currents can be accurately separated from the output three-phase asymmetrical voltages,and the information of voltage and current amplitude,frequency and phase angle can be extracted,the output voltage reaches three-phase equilibrium. The current control adopted a sequential control based on dq coordinate system to balance the unbalanced current output of three phases. Finally,the effectiveness and correctness of the proposed control strategy were verified by comparing the traditional virtual synchronous control strategy with the improved virtual synchronous control strategy in the Matlab/Simulink simulation platform and the HIL hardware in-loop experiment platform.

关 键 词：虚拟同步机 微电网 不对称负荷 可调节系数 dq坐标系分序控制 

分 类 号：TM341[电气工程—电机] TM727