A single-phase PCS with a novel constantly sampled current-regulated PWM scheme

The error-tracking mode (ETM) is a novel constantly sampled pulsewidth modulation (PWM) scheme for a voltage-source power conversion system (PCS) interconnecting with a utility network to regulate its ac current,waveform. It guarantees theoretically the ac actual current to be settled within an arbitrary target allowable error, Generated current harmonics can be restricted by a relatively small filter. Both the minimum on- and off-duration times of switching commands are assured by the PWM scheme itself. A four-quadrant 1-kVA PCS in which gate commands are produced by the novel PWM scheme has been successfully experimented for the first time, and it has justified the ETM-PWM theory,This paper describes the design procedure and experimental results of the trial setup.