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Precision control of single-phase PWM inverter using PLL compensation

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3 Author(s)
Chung, S.K. ; Dept. of Control & Instrum. Eng., Gyeongsang Nat. Univ., Kyungnam, South Korea ; Shin, H.-B. ; Lee, H.W.

High-precision control of a single-phase PWM inverter for constant voltage and constant frequency applications, such as uninterruptible power supplies, is presented. The proposed control employs a capacitor current feedback with a phase-locked loop (PLL) compensator that minimises the steady-state error of the output voltage. The PLL compensator utilises the capacitor voltage and current with a phase difference of 90°. This concept is similar to the dq transform of the three phase variables, and thus the error of the output voltage can be easily minimised by using a proportional-integral type controller. A computer simulation and experiment have been carried out for the actual single-phase PWM inverter controlled by a digital signal processor, and the results clearly demonstrate the effectiveness of the proposed control.

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:152 ,  Issue: 2 )