基于晶闸管的模块化组合式直流泄能装置及其协调控制策略OA北大核心CSTPCD

Aiming at the DC side over-voltage problem caused by the AC side fault at the receiving end of modular multilevel converter based high voltage direct current transmission(MMC-HVDC),this paper proposes a modular combination type dynamic braking resistor topology based on thyristor and its coordinated control method.The topology includes modular release energy release part,current limiting reactor and centralized energy release resistor.The sub-module working modes are introduced,the coordinated control strategy to flexibly regulate the energy release that can avoid repeated switching of dynamic braking resistor is proposed,the power control of dynamic braking resistor and its internal electrical coupling relationship are derived,and the design method of system parameters is given.Finally,based on PSCAD/EMTDC,the MMC-HVDC system and the proposed dynamic braking resistor are developed,and the device characteristics and over-voltage suppression effects under single-phase and three-phase ground faults are studied.The results show that the proposed dynamic braking resistor can effectively adjust the energy release flexibly in different stages with the coordinated control strategy,suppress the DC side over-voltage of MMC HVDC,and improve the fault recovery performances.