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.
出处
《电力自动化设备》
EI
CSCD
北大核心
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)~~
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
virtual synchronous generator
consistency
small-signal stability
electric inverters
eigenvalue
participation factor
