The coordinated control of an AC/DC hybrid system is one of the key technologies to ensure its safe and reliable operation

and it is urgent to carry out in-depth research. We analyze and summarize the coordinated control technology of the low-voltage AC/DC hybrid system. Moreover

we described the state-of-arts and existing problems from the aspects of AC sub-network coordinated control

DC sub-network coordinated control

interlinking equipment of AC/DC system

coordinated control of AC/DC system

and additional damping control of AC/DC system. Meanwhile

we explored the new features of coordinated control under integration of new equipment such as the power electronic transformers and multi-converter negative impedance characteristics

based on the analysis of the coordinated control technology at the various levels of the AC/DC hybrid system

including the AC sub-network

DC sub-network

and the whole system. The research results can be adopted to provide some foundations for researching the control theory and method of AC/DC hybrid system.