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Waveform compensation of PWM inverter with cyclic fluctuating loads

1988; Institute of Electrical and Electronics Engineers; Volume: 24; Issue: 4 Linguagem: Inglês

10.1109/28.6108

1939-9367

Toshimasa Haneyoshi, Atsuo Kawamura, R.G. Hoft,

Silicon Carbide Semiconductor Technologies

A repetitive voltage compensation technique that generates a high-quality sinusoidal output voltage from a single-phase pulse width modulation (PWM) inverter used for uninterruptible power supplies is described. A repetitive control technique eliminates the steady-state error in the distorted output voltage caused by cyclic loads. The proposed PWM inverter system uses microprocessor-based closed-loop digital feedback with a sinusoidal reference. The PWM pattern is determined at every sampling instant by the proposed algorithm, implemented by a microprocessor using a set of detected output voltages and the reference signals through one cycle. The system has low distortion and very fast response for AC phase-controlled loads. >