摘要
为了测试大功率光伏变流器的低电压穿越性能,需要设计大功率电网模拟器。以TI公司浮点分散控制系统(DSC)处理器TMS320F28335为核心,搭建了双三相桥变流系统,将可控整流器和变流器组成双三相桥结构系统用于搭建电网模拟器。为了实现不对称形式的电压跌落,对采样电压和设定电压均进行双dq分解,即对电压进行正负序分离。在分解过程中加入100 Hz陷波器,实现对给定电压和反馈电压的正负序分离。与测试光伏变流器连接后,形成功率回路,在消耗很小电能的情况下,完成满功率低电压穿越性能测试。
In order to test low voltage ride-through( LVRT) function of high power photovoltaic converter,designing work of high power grid simulator is in need. Based on TI Company' s floating-point DSC processor—TMS320F28335, researchers structured a dual three-phase bridge inverter system,i. e. integrating controllable rectifier and converter system into of dual threephase bridge system,for the purpose of creating grid simulator.Sampling voltage and set voltage were performed on double dq decomposition,thus segregating positive and negative sequence voltage,to realize asymmetric voltage drop. Meanwhile,a 100 Hz notch filter was adopted in the decomposition process. Connected with photovoltaic converter,a power loop was formed; the system completed LVRT performance test successfully with only a little power consumption.
出处
《华电技术》
CAS
2015年第4期72-75,79,共4页
HUADIAN TECHNOLOGY
关键词
dq变换
低电压穿越
电网模拟器
光伏逆变器
dq transform
low voltage ride-through(LVRT)
gird simulator
photovoltaic inverter
