摘要
能量路由器作为能源互联网的核心装置,关乎可再生能源的有效消纳以及电网的安全可靠运行。针对现有能量路由器拓扑结构的不足,提出一种适用于多电压等级交直流电网互联的新型能量路由器。首先分析新型能量路由器的拓扑结构,针对不同部分提出相应的控制方法。输入级为模块化多电平换流器(modular multilevel converter,MMC)结构,对其施以虚拟同步电机控制策略,使系统的惯性与阻尼增强。输出级功率灵活调节,使下级电网可通过能量路由器为上级电网提供功率支撑,参与其一次调频。隔离级由双主动全桥(dual-active-bridge,DAB)模块经输入串联输出串联(input-series output-series,ISOS)与输入串联输出并联(input-series output-parallel,ISOP)混联构建,实现不同电压等级交直流电网的网域互联和电气隔离。然后,提出一种功率协调控制方法,在满足输出级所连电网功率需求的同时保证能量路由器的稳定运行。最后,基于PSCAD/EMTDC搭建系统仿真模型,验证了提出的新型能量路由器拓扑结构及控制策略的可靠性和有效性。
As a core device of energy internet, energy routers have considerably high impacts on accommodation of renewable energy and safe and reliable operation of power grid.To overcome the shortcomings of the topology of existing energy routers, a novel structure applicable for multi-voltage AC/DC grid access is proposed for the energy router. The topology of the proposed energy router is analyzed, and corresponding control methods are applied to its different parts.The input stage is based on modular multilevel converter(MMC) structure and virtual synchronous motor control strategy is applied to enhance the inertia and damping of the system. The power of the output port is adjusted flexibly to enable the inferior power grid to provide certain power support to the superior grid and participate in primary frequency regulation. A combined mode of input-series output-series(ISOS) and input-series output-parallel(ISOP) is applied to the dual-active-bridge(DAB) modules of the isolation stage to realize network interconnection and electrical isolation for AC/DC grids of different voltage levels. A power coordination control method is also proposed to meet the power requirements of the grids connected to the output stage and achieve stable operation for the energy router. Finally,reliability and efficiency of the proposed topology and control strategy are verified via PSCAD/EMTDC simulation.
作者
艾欣
荣经国
吕正
李云凝
王坤宇
Al Xin;RONG Jingguo;LU Zheng;LI Yunning;WANG Kunyu(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources (North China Electric Power University),Changping District,Beijing 102206,China;Pudong Electric Power Supply Company of State Grid Shanghai Municipal Electric Power Company,Pudong New District,Shanghai 200120,China;China Electricity Council,Xicheng District,Beijing 100761,China)
出处
《电网技术》
EI
CSCD
北大核心
2019年第4期1202-1210,共9页
Power System Technology
基金
国家重点研发计划资助(2016YFB0900500)
北京市自然科学基金项目(3182037)~~
作者简介
艾欣(1964),男,教授,博士生导师,研究方向为新能源电力系统及微网,E-mail:aixin@ncepu.edu.cn;荣经国(1988),男,博士研究生,通信作者,主要研究方向为交直流电网控制、虚拟同步机控制,E-mail:sunzson@163.com.
