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.