新能源直流汇集分群综合协调控制策略  

Coordinated Control Strategy of New Energy DC Collection System

作　　者：刘飞 赵澄颢 王世斌 田旭 刘联涛 朱晓荣[2] LIU Fei;ZHAO Chenghao;WANG Shibin;TIAN Xu;LIU Liantao;ZHU Xiaorong(Economic and Technological Research Institute of State Grid Qinghai Electric Power Company,Xining 810008,China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071003,Hebei Province,China)

机构地区：[1]国网青海省电力公司经济技术研究院,西宁市810008 [2]新能源电力系统国家重点实验室(华北电力大学),河北省保定市071003

出　　处：《电力建设》2022年第5期127-136,共10页Electric Power Construction

摘　　要：提出了新能源直流汇集系统分群综合协调控制策略,该策略分为功率控制和电压控制两部分。功率控制包括系统各分群内的计划功率及分群间的联络线功率控制,分群内的计划功率考虑了电网分时电价及储能的运行状态,可提高系统运行的经济性;分群间的联络线功率控制采用基于直流分群控制误差(DC group control error, DGCE)的传输功率控制,既保证了分群间的功率互济,也尽可能实现分群运行的独立性。电压控制采用基于一致性算法的电压二次控制结合下垂控制,使直流汇集系统运行在较好的电压水平。最后通过MATLAB/Simulink仿真软件对直流汇集系统在单位工作日下的运行状态进行仿真验证,结果表明采用控制策略后系统的经济性与电压水平均提高,且功率流动更加合理。In this paper, a group of integrated of and coordinated control strategy for new energy DC collection system is proposed, which is divided into two parts: power control and voltage control. Power control includes planned power control within the group and power control of connecting lines between groups. The planned power control within the group takes into account the time-of-use price of power grid and energy storage, which can improve the economy of system operation. The connection-wire power control based on DC group control error(DGCE) is adopted for the power control of the connecting line between clusters, which not only ensures the power interchange benefit between clusters, but also realizes the independence of clustering operation as far as possible. The voltage control adopts voltage secondary control combined with droop control based on distributed consistency algorithm to make the DC collection system run at a better voltage level. Finally, MATLAB/Simulink simulation software is used to verify the operation state of DC collection system in unit working day. The results show that the economy and voltage level of the system are improved after the control strategy is adopted, and the power flow is more reasonable.

关 键 词：新能源 直流汇集 一致性算法 联络线功率 经济性 

分 类 号：TM73[电气工程—电力系统及自动化]