电力建设2024，Vol.45Issue(10)：90-99,10.DOI:10.12204/j.issn.1000-7229.2024.10.009
双闭环VF控制MMC输出短路电流特性分析与计算方法
Short-Circuit Current Characteristics Analysis and Calculation Methods of Modular Multilevel Converter in Double Closed-Loop Voltage-Frequency Control
摘要
Abstract
When a modular multilevel converter(MMC)is connected to an islanded renewable power system,voltage-frequency control must be adopted to provide stable voltage support.This study focuses on the calculation of the short-circuit current of an MMC in the double closed-loop voltage-frequency mode after a three-phase symmetrical short-circuit fault occurs.Considering the circuit and control system characteristics,this study first analyzes the output characteristics of a MMC after a fault occurs and proposes that the MMC can be represented as a current source or a voltage source.Then,calculation methods are proposed for the short-circuit current overshoot when the MMC is represented as a current source and for the short-circuit current DC component when the MMC is represented as a voltage source.Simulations are conducted using PSCAD to verify the accuracy of the proposed method.关键词
模块化多电平换流器(MMC)/VF控制/短路电流/计算方法Key words
modular multilevel converter(MMC)/voltage-frequency control/short-circuit current/calculation method分类
信息技术与安全科学引用本文复制引用
陈怡静,李春华,李英彪,郭小江,王有超,张宇,陈双印..双闭环VF控制MMC输出短路电流特性分析与计算方法[J].电力建设,2024,45(10):90-99,10.基金项目
This work is supported by National Key R&D Program of China(No.2021YFB2400600)and China Huaneng Group Co.,Ltd Science and Technology Project(No.HNKJ20-H54). 国家重点研发计划资助项目(2021YFB2400600) （No.2021YFB2400600）
中国华能集团有限公司科技项目(HNKJ20-H54) （HNKJ20-H54）
