Reaserch And Implementation Of VSC-HVDC Laboratory System

The operational characteristics of voltage source converter (VSC) based HVDC (VSC-HVDC) system are analyzed from AC side and DC side respectively, and from the viewpoint of steady state and transient state the mathematical expressions of DC current and DC voltage are analyzed. Moreover, the parameters of converter reactor and capacitor at DC side in the main circuit of VSC-HVDC are designed. By means of PSCAD/EMTDC package, the VSC-HVDC system with the designed parameters is simulated. Simulation results show that the proposed design approach is reasonable and feasible. According to VSC-HVDC control theory, a laboratory system, whose converters comprise of Insulated Gate Bipolar Transistors (IGBTs), is built up. Based on TMS320LF2407A, the controller and corresponding control circuit are designed; the observation section based on Controller Area Network (CAN) and data acquisiton card is designed. The laboratory system can accomplish the task of feeding power to passive system. The laboratory system can be utilized as a platform for further studies and the laboratory results prove VSC-HVDC's excellent performance.