| 摘要 |
The present invention is directed to a power converter that can be used to interface a motor 4 that requires variable voltage at variable frequency to a supply network (bus) providing a nominally fixed voltage and nominally fixed frequency. The power converter includes a first active rectifier/inverter 10 electrically connected to the stator of the motor 4 and a second active rectifier/inverter 14 . Both the first and second active rectifier/inverters include a plurality of semiconductor power switching devices. A dc link 12 is connected between the first active rectifier/inverter and the second active rectifier/inverter. A filter 16 is connected between the second active rectifier/inverter and the supply network and includes network terminals. The power converter includes a first controller 18 for the first active rectifier/inverter and a second controller 20 for the second active rectifier/inverter. The first controller 18 uses a dc link voltage demand signal VDC_MOT* indicative of a desired dc link voltage to control the semiconductor power switching devices of the first active rectifier/inverter 10 to achieve the desired level of dc link voltage that corresponds to the dc link voltage demand signal. The second controller 20 uses a power demand signal P* indicative of the level of power to be transferred to the dc link 12 from the supply network (bus) through the second active rectifier/inverter 14 , and a voltage demand signal VBUS* indicative of the voltage to be achieved at the network terminals of the filter 16 to control the semiconductor power switching devices of the second active rectifier/inverter 14 to achieve the desired levels of power and voltage that correspond to the power and voltage demand signals. The power converter can be employed in a marine propulsion system where the rotor of the motor 4 is used to drive a propeller assembly 2.
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