Parallel-connected power conversion system of multi-phase generator and method of operating the same

摘要

A parallel-connected power conversion system of a multi-phase generator configured to provide a power factor correction for a multi-phase generator. The parallel-connected power conversion system includes a parallel-connected power conversion apparatus and a control unit. The parallel-connected power conversion apparatus has a plurality of power conversion units connected in parallel to each other. The parallel-connected power conversion apparatus receives a plurality of generator currents and a plurality of generator voltages generated from the multi-phase generator, and outputs a DC voltage. The control unit generates a plurality of control signals to correspondingly control the power conversion units so that the generator currents linearly follow the generator voltages, therefore the power factor correction of the multi-phase generator is achieved.

主权项

1. A parallel-connected power conversion system of a multi-phase generator, providing a power factor correction for the externally connected multi-phase generator, the parallel-connected power conversion system comprising:
a parallel-connected power conversion apparatus comprising a plurality of power conversion units connected in parallel to each other, and configured to receive a plurality of generator currents and a plurality of generator voltages generated from the multi-phase generator to output a DC voltage; and a control unit comprising:
an outer control loop configured to receive the DC voltage and the generator voltages to output at least one current operation command; andan inner control loop configured to receive the generator currents, the at least one current command, and a plurality of voltage operation commands to generate a plurality of control signals to correspondingly control the power conversion units so that the generator currents linearly follow the generator voltages to correct the power factor of the multi-phase generator; wherein the inner control loop comprises:
a plurality of multiplying units, each multiplying unit is configured to receive the current operation command and one of the voltage operation commands, and calculate the product between the current operation command and the voltage operation command to generate a current command; anda plurality of current control loops, each current control loop is configured to correspondingly receive one of the current commands and one of the generator currents to generate a control signal; wherein the control unit is configured to correspondingly control the power conversion units by the control signals; and wherein the control unit further comprises:
a plurality of normalization operation units, each normalization operation unit is connected to one of the multiplying units and is configured to correspondingly receive one of the generator voltages; the normalization operation units are configured to normalize the generator voltages to correspondingly generate the voltage operation commands.