Dynamic Modeling and Nonlinear-Decouple Control of HVDC Light System

HVDC light is a new generation of HVDC power transmission based on PWM controlled voltage source converter(VSC) and possesses following advantages: flexible power control,capability of transmitting power to active and passive network as well as lower harmonics amount,etc.The authors establish a dynamic model of HVDC light system under synchronous rotating coordinate system,design a nonlinear decouple controller and realize individual control for active and reactive power transmission.By means of electromagnetic simulation software PSCAD/EMTDC,the principle of power control is analyzed,and the effectiveness of the established model and designed controller are validated in different standpoints.