与SG具有一致响应的VSG小信号建模和分析  

Small signal modeling for virtual synchronous generator consistent with synchronous generator and analysis

作　　者：陈昕 张昌华 黄琦 杨文龙 陈树恒 刘群英 

机构地区：[1]电子科技大学能源科学与工程学院,四川成都611731

出　　处：《电力自动化设备》2017年第11期78-85,共8页Electric Power Automation Equipment

基　　金：留学回国人员科研启动基金资助项目;中央高校基本科研业务费资助项目(ZYGX2015J104);国家自然科学基金资助项目(51677020)~~

摘　　要：提出一种新型的虚拟同步发电机(VSG)设计方法,构建虚拟的励磁控制器、调速器和电磁暂态模拟单元。分别对机端电压的d、q分量引入PI控制器,以达到VSG与同步发电机(SG)具有一致响应的目的。建立VSG单机无穷大系统小信号模型,求取并分析系统特征根及其参与因子。分析惯性时间常数、励磁参数对VSG小信号稳定性的影响规律,发现其与SG相关理论吻合。同时分析PI控制参数、线路参数对系统小信号稳定性的影响。利用MATLAB/Simulink仿真验证了上述方法的正确性。An improved VSG（Virtual Synchronous Generator） model is presented through modeling of virtual exciter,governor,and electromagnetic transient simulation unit.A PI internal-loop controller is designed for inverter terminal voltage d-and q-axis elements,which ensures that the proposed improved VSG can provide an equivalent dynamic response as SG（Synchronous Generator）.A small-signal model of a single VSG machine infinite-bus system is developed,and then the system eigenvalues and participation factors are calculated.Effects of the inertia time constants and the excitation system parameters on VSG small-signal stability are analyzed.The analyzed conclusion coincides with the correlative theories of SG.Influences of the PI controller parameters and the line parameters on VSG small-signal stability are also analyzed.Simulative results based on MATLAB/Simulink verify the effectiveness of the proposed method.

关 键 词：虚拟同步发电机 一致性 小信号稳定性 逆变器 特征根 参与因子 

分 类 号：TM34[电气工程—电机] TM712