Method of controlling paralleled passive front-end rectifiers with and without inter-leaving

A method of controlling a motor with a three-phase paralleled passive front-end drive, comprising:

• operably connecting a rectifier bridge configured for connection to a three phase alternating current power source;
• operably connecting a coupling reactance operably connected to the rectifier bridge and configured to transfer power from the rectifier to a first direct current (DC) bus;
• operably coupling the first DC bus to a second DC bus via a bus coupler;
• operably connecting a first inverter to the first DC bus and operably connecting a second inverter to the second DC bus, the first inverter and the second inverter each configured to provide a plurality of motor excitation signals;
• operably connecting a first controller to the first inverter and the second inverter, the first controller configured to generate control signals to cause the first inverter and the second inverter to generate the plurality of motor excitation signals respectively, the first controller;
• generating a first pulse width modulation (PWM) reference signal and a second PWM reference signal,
• generating a first set of control signals to the first inverter and generating a second set of control signals to the second inverter based on at least one of the first PWM reference signal and the second PWM reference signal,
• generating a duty cycle for the control signals based on at least one of the first PWM reference signal and the second PWM reference signal,
• perturbating the duty cycle of at least one of the first set of control signals and the second set of control signals based on at least one of the first PWM reference signal and second PWM reference signals cause the first inverter and the second inverter to provide substantially equal motor excitation currents respectively;
• and
• combining the plurality of motor excitation signals from the first inverter with the plurality of motor excitation signals from the second inverter with a plurality of interphase inductors;
• operably connecting a motor to the plurality of interphase inductors, the motor configured to receive the plurality of combined motor excitation signals.