Angle controlled current regulated rectifiers for AC/AC converters

Rectifier control schemes for use in AC/DC/AC voltage-sourced resonant link converters with controlled rectifiers are discussed. It is shown that the voltage-sourced rectifier cannot be operated solely on the basis of instantaneous quantities. A bang-bang control scheme that independently controls the angle and the magnitude of the AC-line current vector is developed and simulated. The magnitude of the current is controlled using a linear combination of the link voltage error and the current magnitude error. The current reference is derived by the use of load torque estimation. In addition, the current vector which satisfies the sliding mode criteria and results in lowest voltage ripple is chosen to further minimize the size of the link capacitor