Six-Pulse Diode Bridge

The figure below shows a six-pulse diode bridge rectifier, where the inductor \(L_\mathrm{dc}\) is placed in the DC link. For simplicity, a three-phase supply voltage is assumed to be stiff. The DC current dynamics are

(1)\[L_\mathrm{dc} \frac{\mathrm{d}i_\mathrm{L}}{\mathrm{d}t} = u_\mathrm{di} - u_\mathrm{dc}\]

where \(i_\mathrm{L}\) is the DC-bus current, \(u_\mathrm{di}\) is the voltage over the diode bridge, \(u_\mathrm{dc}\) is the DC-bus voltage, and \(L_{\mathrm{dc}}\) is the DC-bus inductance.

Six-pulse diode bridge rectifier.

The voltage-source converter described in Common is extended with this diode bridge model in the class motulator.drive.model.FrequencyConverter. Examples using the six-pulse diode bridge can be found in 2.2-kW induction motor, diode bridge and 2.2-kW PMSM, diode bridge.