考虑可再生能源接入的多端MMC交直流混合系统协调控制  

Coordinated control of multi-terminal MMC AC/DC hybrid system considering renewable energy access

作　　者：李晓萍[1] 袁至[1] 王维庆[1] 何山[1] Li Xiaoping;Yuan Zhi;Wang Weiqing;He Shan(Engineering Research Center of Renewable Energy Generation and Grid Connection Control,Ministry of Education,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学可再生能源发电与并网控制教育部工程研究中心,新疆乌鲁木齐830047

出　　处：《可再生能源》2024年第5期675-684,共10页Renewable Energy Resources

基　　金：国家自然科学基金(52067020,51767024);新疆维吾尔自治区重点实验室开放课题(2018D04005);新疆维吾尔自治区高校科研计划项目(XJEDU20211010)。

摘　　要：模块化多电平变换器的零转动惯量特性,使其无法对交流电网的频率波动提供支撑,导致交直流混合系统的整体惯性下降,影响并网系统的动态性能与稳定性。文章将改进功率-电压下垂控制与虚拟同步机技术相结合,提出一种新型功率协调控制策略。在系统直流电压稳定的情况下,对交流电网进行频率调节,同时对各变换器间的功率进行合理分配,无需通讯系统即可建立有效的能量管理体系。与传统双闭环控制进行对比试验,结果表明,所提控制策略有效解决了系统由低惯量、欠阻尼引起的动态性能与稳定性的问题。The characteristics of zero moment of inertia of modular multilevel converter,it can not support the frequency fluctuation of AC power grid,so that the overall inertia of AC/DC hybrid system decreases,affecting the dynamic performance and stability of the system.Therefore,an improved power-voltage droop control combined with a virtual synchronous machine technology of coordinated control strategy,in the case of dc voltage stability of ac power grid frequency adjustment,at the same time,reasonable allocation of power between the converter,in the case of without communication system to establish effective energy management system.In order to verify the feasibility and effectiveness of the proposed control strategy,a comparative test was conducted with the traditional double closed-loop control.The results show that the proposed control strategy effectively solves the dynamic performance and stability problems of the system caused by low inertia and under damping.

关 键 词：模块化多电平变换器 改进功率-电压下垂控制 虚拟同步机技术 频率调节 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程] TK51