浙江电力2023，Vol.42Issue(12)：73-80,8.DOI:10.19585/j.zjdl.202312009
基于定向电流指令的构网变流器故障限流策略
A fault current limiting control strategy for GFM converters based on directional current command
摘要
Abstract
The grid-forming(GFM)control technology is instrumental in enabling converters to provide frequency and voltage support response akin to synchronous generators,thus bolstering the stability of the new power system.Nonetheless,a notable challenge lies in delivering grid support during fault current limiting.To this end,a strategy for fault current limiting in GFM converters based on measuring terminal and internal differential voltage orientation is proposed.In this approach,the angles of the positive and negative sequence current commands lag 90° behind the positive and negative sequence voltage differences.Additionally,the maximum magnitude of the synthesized vector of the current commands aligns with the converter's overcurrent capability,which is equivalent to the generation of positive and negative sequence adaptive virtual inductance by control,respectively.This method obviates the need for direct virtual inductance value calculations and can maximize the maximum support capacity of the converter to realize the fault current characteristics resembling those of synchronous generators.The proposed fault current limit-ing strategy is validated by a simulation system built through PSCAD/EMTDC.The simulation outcomes affirm the strategy's efficacy in delivering substantial grid support to the AC system while limiting fault currents.关键词
新型电力系统/变流器控制/构网控制/故障限流/压差定向Key words
new power system/converter control/GFM control/fault current limiting/differential voltage orienta-tion引用本文复制引用
汪楠楠,邹强,卢宇,阎鹏伟,田杰,詹长江..基于定向电流指令的构网变流器故障限流策略[J].浙江电力,2023,42(12):73-80,8.基金项目
国家电网有限公司科技项目(5100-202256369A-2-0-ZN) （5100-202256369A-2-0-ZN）
