A multiunit power conversion system comprises: a first power conversion unit, a second power conversion unit, and a current sharing transformer. The first power conversion unit comprises a first resonant capacitor and a first resonant inductor in series. The second power conversion unit comprises a second resonant capacitor and a second resonant inductor in series. The current sharing transformer comprises a first winding and a second winding magnetically coupled for current-sharing of the first and second power conversion units. The first and second windings are connected in parallel to the first and second resonant capacitors, respectively; or the first and second windings are connected in parallel to the first and second resonant inductors, respectively; or the first winding is connected in parallel to the first resonant capacitor and the first resonant inductor, and the second winding is connected in parallel to the second resonant capacitor and the second resonant inductor.