Optimal Designation of Surplus Power AC Chopper in New Energy Transmitted by VSC-HVDC System

In this paper, a composite capacity AC chopper configuration strategy is introduced. Firstly, the surplus power characteristics and control modes of the VSC-HVDC system are investigated; secondly, the scheme and control logic of the composite capacity AC chopper are investigated on the basis of the fixed-capacity AC chopper; finally, the proposed composite-capacity AC cchopper is proved to have higher control flexibility and control accuracy by simulation comparison.