Harmonic elimination in three phase PWM rectifier using FPGA control

Pulse width modulated rectifier is a very popular topic nowadays. The modern industrial production demands continuous and lossless conversion of electrical energy parameters. This need leads to wide spread of power semiconductor converters. The rapid development in power electronics enables to apply sophisticated control methods that eliminate negative side effects of the power converters on the supply network. The phase controlled thyristor rectifiers overload the supply network with higher harmonics and reactive power consumption. That is why the PWM rectifier is being examined. Here FPGA based controller is used to generate necessary pulses to drive the devices of the rectifier. In comparison with the phase controlled rectifier it can be controlled to consume nearly sinusoidal current with power factor equal to unity. Another advantage is its capability of energy recuperation. The paper deals with the PWM rectifier functional model realization and examination. PWM rectifier and phase controlled rectifier is compared on the basis of the input current harmonic analysis.