摘要
由于交直流混合微电网中分布式电源的成本各异,按照容量比例分配功率的下垂控制易造成系统成本较高,文中提出基于增量成本的下垂控制。为进一步解决线路阻抗不匹配对功率分配精度的影响,充分考虑微电网的经济运行,提出基于一致性算法的分级分布式控制策略。该控制策略分为子网级控制与系统级经济控制。子网级控制在基于增量成本的下垂控制中引入频率/电压二次控制项和成本二次控制项,恢复交流频率与直流电压,同时实现子网之间的分布式电源的经济功率分配。在系统级经济控制中引入“相对频率指数”与“相对电压指数”,构造双向互联变流器的本地控制策略,并进一步引入基于一致性算法的功率二次控制项,实现各分布式电源增量成本一致,从而达到系统全局最优的经济运行。最后,对交直流混合微电网模型进行仿真,验证了所提控制策略的有效性。
Due to the varying costs of distributed generators in the AC/DC hybrid microgrids,it tends to cause higher system costs with the droop control that distributes power according to the capacity ratio.A droop control based on incremental costs is proposed to address this issue.To further eliminate the impact of mismatched line impedances on the power distribution accuracy and fully consider the economic operation of the microgrid,this paper proposes a hierarchical distributed control strategy based on the consensus algorithm.This control strategy is divided into the subnetwork-level control and system-level economic control.The subnetwork-level control introduces the frequency/voltage secondary control term and cost secondary control term in the incremental cost based droop control to restore the AC frequency and DC voltage,and realizes the economic power distribution of distributed generators among the subnetworks at the same time.In the system-level economic control,the“relative frequency index”and“relative voltage index”are introduced to construct the local control strategy of the bi-directional interconnected converter.The power secondary control term based on the consensus algorithm is further introduced to realize the consistent incremental cost across distributed generators,so as to achieve the globally optimal economic operation of the system.Finally,the simulation of the AC/DC hybrid microgrid model is carried out to verify the effectiveness of the proposed control strategy.
作者
杨帆
曹九宙
叶灵玥
李东东
林顺富
赵耀
沈运帷
YANG Fan;CAO Jiuzhou;YE Lingyue;LI Dongdong;LIN Shunfu;ZHAO Yao;SHEN Yunwei(College of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Wenling Power Supply Company of State Grid Zhejiang Electric Power Company Co.,Ltd.,Taizhou 317500,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2024年第18期199-207,共9页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(52377111)
上海市青年科技英才扬帆计划资助项目(21YF1414700)
上海市教育委员会和上海市教育发展基金会“晨光计划”资助项目(21CGA64)。
关键词
交直流混合微电网
分布式电源
分级分布式控制
一致性算法
增量成本
AC/DC hybrid microgrid
distributed generator
hierarchical distributed control
consensus algorithm
incremental cost
作者简介
杨帆(1981-),女,博士,教授,博士生导师,主要研究方向:微电网控制、负荷频率控制。E-mail:yangfan@shiep.edu.cn;曹九宙(1999-),男,硕士研究生,主要研究方向:微电网控制。E-mail:15171813679@163.com;叶灵玥(1997-),女,硕士,主要研究方向:交直流混合微电网。E-mail:yly7248@163.com;通信作者:李东东(1976-),男,博士,博士生导师,主要研究方向:电力系统分析、新能源并网和智能用电。E-mail:shiepldd@163.com。
