Patent ID: 8193756

Claim:
A drive system for a compressor of a chiller system, the drive system comprising: a variable speed drive, the variable speed drive being configured to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency, the variable speed drive comprising: a converter connected to an AC power source providing the input AC voltage, the converter being configured to convert the input AC voltage to a DC voltage; a DC link connected to the converter, the DC link being configured to filter and store the DC voltage from the converter; and at least one inverter connected to the DC link; a motor connectable to the compressor for powering the compressor; and an active filter connected between the at least one inverter and the motor, the active filter configured to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive, the high frequency currents generated by active filter substantially cancelling high frequency currents flowing into the motor.