The DC-link quantity is then impressed by an energy storage element that is common to both stages, which is a capacitor C for the voltage DC-link or an inductor L for the current DC-link. Such phase-controlled thyristor-based rectifiers however have higher AC line distortion and lower power factor at low load than diode-based rectifiers.Īn AC-AC converter with approximately sinusoidal input currents and bidirectional power flow can be realized by coupling a pulse-width modulation (PWM) rectifier and a PWM inverter to the DC-link. Alternatively, an anti-parallel thyristor bridge must be provided in the rectifier section to feed energy back into the AC line. 3): In CSI converters, the rectifier consists of a phase-controlled switching device bridge and the DC link consists of 1 or 2 series inductors between one or both legs of the connection between rectifier and inverter.Īny dynamic braking operation required for the motor can be realized by means of braking DC chopper and resistor shunt connected across the rectifier. Current-source inverter (CSI) converters (Fig.2): In VSI converters, the rectifier consists of a diode-bridge and the DC link consists of a shunt capacitor. Voltage-source inverter (VSI) converters (Fig.There are two types of converters with DC link: Fig 3: Topology of current-source inverter AC/DC-AC converter
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