单相并网逆变器的定频滞环电流控制

提出一种用于分布式发电系统与公用电网并网的单相逆变器定频滞环电流控制新方法,该方法在对前一周期的电流误差进行采样的基础上,利用最小二乘算法估计下一周期电流误差的变化趋势,然后控制下一周期电流误差以实现定频滞环电流跟踪,改善输出电流波形,提高控制精度。利用Matlab进行建模,仿真结果证明了该方法有非常快的响应速度,可使输出电流与电网电压同频同相,向电网输出高质量的电能。

Constant-Frequency Hysteresis Current Control of Single Phase Grid-Connected Inverter

A new constant-frequency hysteresis current control method for single phase grid-connected inverter is proposed.Based on sampling the last cycle of current error,the trend of next cycle of current error by least-squares algorithm is estimated,and the next cycle of current error to track reference current is controlled.Then,switching frequency is corrected to target value,the output current waveform is improved,and the control accuracy is improved.At last,rebuilding simulation model by Matlab,the simulation result indicates that very fast output transient response can be achieved.The output current has the same frequency and phase as utility grid,with a result of exporting high quality power energy to the grid.