摘要
针对虚拟同步发电机(VSG)接入中低压电网的阻抗特性而导致有功-无功功率耦合问题,通过建立VSG的数学模型分析了线路阻抗导致的功率耦合机理,建立VSG并网运行的功-频动态响应模型,发现VSG输出有功的波动会加剧无功功率的控制偏差。基于功率耦合机理,采用可控虚拟阻抗策略能够有效实现VSG的功率解耦。最后,在Matlab/Simulink中搭建仿真模型,验证了VSG的功率耦合特性及功率解耦策略的有效性。
Aiming at the problem of active-reactive power coupling caused by the impedance characteristics of virtual synchronous generators(VSG)connected to medium and low voltage power grids,the power coupling mechanism caused by line impedance was analyzed by establishing the mathematical model of VSG,and the power-frequency dynamic response model of VSG grid-connected operation was established,it was found that the active power fluctuation of VSG output would aggravate the control deviation of reactive power.Based on the power coupling mechanism,the power decoupling of VSG could be effectively realized in the controlled virtual impedance strategy.Finally,a simulation model was built in Matlab/Simulink to verify the power coupling characteristics of VSG and the effectiveness of power decoupling strategy.
作者
滕俊杰
李素敏
TENG Junjie;LI Sumin(Department of Electrical Engineering,Xuchang Electrical Vocational College,Xuchang 461000,Henan,China)
出处
《电气传动》
北大核心
2019年第10期60-64,69,共6页
Electric Drive
关键词
虚拟同步发电机
功率耦合
功角
可控虚拟阻抗
功率解耦
virtual synchronous generator(VSG)
power coupling
power angle
controlled virtual impedance
power decoupling