Electric energy conversion system and auxiliary power supply method thereof

The invention provides an electric energy conversion system and an auxiliary power supply method thereof. The electric energy conversion system comprises an AC port, a DC port, an AC-DC converter, a bus capacitor and three auxiliary sources. The AC port receives or provides AC voltage, and the DC port provides or receives DC voltage. The AC end and the DC end of the AC-DC converter are electrically connected with the AC port and the DC port respectively. The bus capacitor is electrically connected to the DC end. The input end of the first auxiliary source is electrically connected to the AC port so as to receive the AC voltage. The input end of the second auxiliary source is electrically connected to the DC port so as to receive the DC voltage. The input end of the third auxiliary source is electrically connected to the bus capacitor so as to receive the capacitor voltage on the bus capacitor. 本公开提供一种电能转换系统及其辅助供电方法，电能转换系统包含交流端口、直流端口、AC-DC转换器、母线电容和三个辅助源。交流端口接收或提供交流电压，直流端口提供或接收直流电压。AC-DC转换器的交流端及直流端分别电连接于交流端口及直流