电流跟踪控制的风力发电并网逆变器研究

Research on Grid-connected Inverter based on Current Track Control in Wind Generation System

在风力发电系统中,并网逆变器的控制是实现电能转换与传输的重要环节。系统采用电流瞬时反馈控制,直接以电网电压同步信号作为逆变器输出电流跟踪指令;通过对网侧电流的闭环跟踪控制,实现单位功率因数向电网馈送电能,并根据三相电压源型并网逆变器开关函数的数学模型进行了控制系统仿真研究。仿真和实验结果均表明,采用该控制策略可以改善馈网电流质量,提高了并网逆变器的稳定性和动态性能。

In wind generation system,controlled on connecting electricity web inverter is the best important point in achieving the transformation and transmission of the power.The system is controlled in time by the feedback current,the synch of the grid-voh is used to be the output of the inverter of the current track command, by the circle feedback control of grid-current,achieving unit power-factor to send the grid.Then grid-connected inverter control system model combined switch function is set up.The simulative and experimental results testify that the proposed control strategy improve the stabilization and dynamic of the grid-inverter.