Research on Modeling Control and Protection Strategy of Supplying Power to Passive Network of MMC-HVDC System

摘要

This paper is based on the EL mathematical model of the MMC synchronous rotating coordinate system, derivedthe MMC passive control law, the inner ring current passive controller is designed and the AC voltage controller isset. In order to restrain the negative sequence current caused by the network voltage unbalance or asymmetric AC systemfault, the positive and negative sequence of independent passive controller and the control of failure protection strategywere proposed. Finally 21st level supply power to passive network-MMC HVDC system model was set up under thePSCAD/EMTDC, the response characteristics of various working conditions is the controller and the control protectionstrategy has been carried on a simulation, and the characteristics of the positive and negative sequence of passive controland vector control were comparative analyzed.