Proportional–Resonant Controller Based on Virtual Impedance for Harmonic Suppression of ESS-UPS System

A proportional–resonant controller based on the output impedance is proposed for a single-phase full-bridge inverter offering harmonic suppression of uninterruptible power supply with an energy storage system. In order to design voltage transfer function and independently, properly places virtual loop within controller, control gains are selected according rules. To secure high quality, designed have low characteristics in all frequency bands. addition, some practical issues analyzed readily compensated such as parametric error performance tracking respectively. Mathematical theoretical analyses presented validate experiments were conducted verify its performance.