摘要
基于交直流混合配电技术的柔性变电站是未来配电网发展的一大趋势,柔性变电站因其具备中/低压、交/直流多端接口、具有潮流柔性管控、多形态能源接入、故障限流和隔离等多种功能而受到广泛关注。双向DC/AC变换器是柔性变电站的重要组成部分,可实现低压交直流端口间能量的双向流动。为使双向DC/AC变换器在柔性变电站环境中安全可靠运行,研究双向DC/AC变换器控制策略成为迫切的需求。以张北交直流配电网及柔性变电站示范工程为实例,根据双向DC/AC变换器不同控制目标,从谐波补偿、不平衡电压抑制、多机并联等关键控制技术进行综述,并对基于柔性变电站双向DC/AC变换器控制技术的发展趋势进行探讨,为建设柔性变电站工程提供参考。
Flexible substation based on AC/DC hybrid power distribution technology is a major trend for future distribution network development.It has attracted wide attention due to multiple functions,such as its multiterminal interfaces for medium/low and AC/DC voltage,flexible power flow control,multi-modal energy intervention,fault current limiting and isolation.The bidirectional DC/AC converter is an important part of the flexible substation,which can realize the bidirectional flow of energy between the low voltage AC and DC ports.The study for bidirectional DC/AC converter control strategy is an urgent need for the safe and reliable operation.Taking AC/DC distribution network and flexible substation demonstration project in Zhangbei as an example,according to different control objectives of bidirectional DC/AC converters,it was reviewed from key control techniques such as harmonic compensation,unbalanced voltage suppression,and multi-machine parallel connection.The trend for bidirectional DC/AC converter control strategy of flexible substation was discussed,which provides reference for the construction of flexible substation project.
作者
陈亚爱
赵军伟
周京华
赵荀
CHEN Yaai;ZHAO Junwei;ZHOU Jinghua;ZHAO Xun(Inverter Technology Engineering Research Center of Beijing,North China University of Technology,Beijing 100144,China)
出处
《电气传动》
2021年第1期3-10,共8页
Electric Drive
基金
国家自然科学基金面上项目(51777002)
北京市高水平创新团队建设计划资助项目(IDHT20180502)。
关键词
柔性变电站
双向DC/AC变换器
谐波补偿
电压不平衡抑制
多机并联
flexible substation
bidirectional DC/AC converter
harmonic compensation
unbalanced voltage suppression
multimachine parallel
