说明：  The first one consists of an uncontrolled diode rectifier followed by a dc-dc converter [4], which has some major drawbacks. Using diode rectifier will result in high Total Harmonic Distortion (THD) values for generator currents and high ripples in the torque waveform as well. It is also impossible to independently control d- and q-axis currents by this configuration. The second configuration uses a controllable rectifier and does not have the above mentioned problems of the first configuration