基于单周控制的单相并网逆变算法

提出一种基于单周控制的小型风力发电机组逆变并网算法.该方法结合PI调节和单周控制,在半周期内把逆变器等效为BUCK电路进行分析,使单相全桥逆变器工作在并网状态.基于该算法的单相并网逆变器在半周期内有一对开关管保持关断状态,与传统的双极性调制方式比较,能降低开关损耗,也可避免因加入死区时间带来的波形失真.Simulink仿真结果表明:在风机输出功率变化以及电网电压幅值受到扰动的情况下,基于单周控制的单相并网逆变器的输出电流能有效、快速地跟踪参考电流,并能与电网电压的频率、相位保持一致,从而使小型风力发电机组达到对电网输入能量的要求.实现该方法的硬件电路较为简单,宜作进一步研究应用.

Single-phase Grid-connected Inverting Algorithm Based on One-cycle Control

A grid-connected inverting algorithm based on one-cycle control is proposed.It combines PI regulation and one-cycle control.The single-phase full-bridge inverter is analyzed as a BUCK converter in either positive or negative half period,to let the inverter work under grid-connected condition.The inverter keeps one pair of switches shut during half period to reduce switching loss compare to the traditional method and avoid waveform distortion brought by adding dead time.Simulation results show that when either the wind turbine power changes or the power grid is disturbed,the output current of the inverter based on one-cycle control can efficiently and rapidly track the reference current,and keep no phase displacement to grid voltage.The hardware of this method is simple,and can be further studied.