Sinusoidal Voltage Shaping of Inverter-Equipped Stand-Alone Generating Units

Voltage-source inverters in microgrid stand-alone applications need the accurate control of the filter output voltages. Most of the time, supplied loads are not constant along daily based period; they change the total power consumption, the power factor, the current harmonic content of nonlinear equipment, and the power balancing among the phases. Consequently, the control dynamic behavior is affected, and the effectiveness of harmonic controllers is reduced. In this paper, the very sinusoidal shaping of inverter output voltage is achieved through a multiple resonant controller, which is adaptively tuned online according to the output power filter and load behavior. Resonant compensators are placed in the loop to achieve low total harmonic distortion of output voltage waveforms.