A RC with Simplified Fractional Phase Lead Compensation

The output voltage of the inverter under strong nonlinear load will be distorted. The Conventional Repetitive controller (CRC) can improve the output voltage quality, where an integer phase lead compensation is employed. However, under low sampling frequency condition, CRC can’t provide suitable phase lead for system, which will influence system stability. An improved Repetitive Controller is proposed, which consists of Odd Harmonic Repetitive Controller (OHRC) and Simplified Fractional Phase Lead Compensator (SFPLC), SFPLC can compensate for suitable system phase lead. The improved RC is simple and suitable for low sampling frequency condition. Experimental results demonstrate its effectiveness.