A Method of Single-Phase PWM for an Independent Power Supply in Photovoltaic Power Generation Systems

摘要

ew propose a method of single-phase PWM for an independent power supply in photovoltaic power genera- tion systems. This new PWM is derived by comparing levels of signal waves with one of carrier waves which have bipolar swing different from unipolar swing in the conven- tional PWM. In this PWM, we can use a battery with lower voltage in combination with the photovoltaic power gen- eration; fundamental level of output voltage is raised by about 11/100, though poor in quality of waveforms.