电力系统自动化2017，Vol.41Issue(5)：106-113,8.DOI:10.7500/AEPS20160505008
适用于全桥型模块化多电平换流器的直流融冰装置控制策略
Control Strategies of DC Ice-melting Equipments for Full-bridge Modular Multilevel Converters
摘要
Abstract
The previous thyristor rectifier based DC ice-melting equipment consumes too much reactive power and brings about characteristic harmonics,which further affects the AC system stability.The full-bridge modular multilevel converter (MMC),with its ability of outputting bidirectional DC voltage and DC current,can meet the demand of DC melting on operation conditions of converters.This paper focuses on the control strategies for DC ice-melting equipment for full-bridge MMC.First,the operation principle of the main circuit topology of DC ice-melting equipment based on full-bridge MMC is described,and the modulation ratio definition applied in full bridge MMC is given.By taking advantage of the full-bridge sub-module (FBSM) ability of outputting positive,zero and negative capacitor voltages,the zero-initial voltage and current boosting of the fullbridge MMC is analyzed to satisfy the de-ice demands of different types and lengths of AC conductors.At the same time,the AC side voltage of full-bridge MMC should be made to remain satisfactory and almost sinusoidal even when the DC voltage is very low.Considering the capacities for var compensation,facility utilization and element redundance,the topological structure of the ice-melting equipment in the reactive compensation mode is determined.Finally,an electromagnetic transient model of DC ice-melting equipment is developed on PSCAD/EMTDC and the results have verified the effectiveness of the proposed control strategies.关键词
直流融冰/模块化多电平换流器/零起升压/零起升流/静止同步补偿器Key words
DC ice-melting/modular multilevel converter (MMC)/zero-initial voltage boosting/zero-initial current boosting/static synchronous compensator (STATCOM)引用本文复制引用
郭裕群,周月宾,许建中,许树楷,赵成勇,傅闯..适用于全桥型模块化多电平换流器的直流融冰装置控制策略[J].电力系统自动化,2017,41(5):106-113,8.基金项目
中国南方电网有限责任公司科技项目(KY2014-2-009).This work is supported by China Southern Power Grid Company Limited (No.KY2014-2-009). （KY2014-2-009）
