Design and implementation of a 25 kVA three-phase PWM AC line conditioner

An improved version of transistor-based AC line conditioners is proposed. As compared to previously reported structures, it uses fewer standard transistor modules. This, in combination with less stringent gating requirements, improves the overall operating reliability of the system. In addition, it retains the same advantages such as sinusoidal input/output waveforms, fast dynamic response, and small input/output filters. The operating principle of the proposed structure is discussed and the voltage feedback loop design is analyzed. Results from a 25 kVA experimental set-up are provided for verification.