《A novel DSP-based current-controlled PWM strategy for single phase grid connected inverters》.pdf

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 4, JULY 2006 985 A Novel DSP-Based Current-Controlled PWM Strategy for Single Phase Grid Connected Inverters Hossein Madadi Kojabadi, Bin Yu, Idris A. Gadoura, Member, IEEE, Liuchen Chang, Senior Member, IEEE, and Mohsen Ghribi Abstract— The three major approaches for current-regulated in- Predictive controllers calculate the inverter voltages required verters are ramp comparison, hysteresis control, and predictive to force the measured currents to follow the reference current current control. From these three, predictive current control offers [6], [7]. This method offers the potential for achieving more the potential for achieving more precise current control with min- imum distortion and harmonic noise. But, the predictive method is precise current control with minimum distortion and harmonic difficult to implement and needs more computational burden. The noise, however, it needs more calculations and requires a good traditional predictive current controller has a poor performance knowledge of the system parameters. Thanks to the availability under component parameter variations, and is less robust to filters of powerful, low-cost digital signal processors (DSP)-based inductance mismatch. A robust predictive current control strategy microcontrollers, the implementation of predictive strategies was proposed and studied. Both simulations and experimental re- into digital controllers has been of particular interest in recent sults show that the proposed method is much more robust to pa- rameter mismatch than the traditional