基于双VSC的柔性合环装置的交直流侧合环控制策略研究  

Research on the Control Strategy of AC and DC Side Loop-closing of Flexible Loop-closing Device Based on Double VSC

作　　者：杨用春[1] 牛超群 唐健雄 赵成勇[1] 徐志 YANG Yongchun;NIU Chaoqun;TANG Jianxiong;ZHAO Chengyong;XU Zhi(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Baoding 071003,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd,Kunming 650000,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),河北保定071003 [2]云南电网有限责任公司电力科学研究院,云南昆明650000

出　　处：《华北电力大学学报（自然科学版）》2023年第2期1-9,共9页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51607068);中央高校基本科研业务费专项资金资助项目(2021MS068).

摘　　要：伴随社会产业的发展和智能电网的推进,用户对电能质量和供电可靠性的要求越来越高,因此配电网不停电合环负荷转供具有重要意义。文章针对极端条件下的不停电负荷转供需求,采用两侧独立STATCOM联合构成的具有灵活控制功能的双VSC柔性合环装置,提出了分别从交、直流侧进行合环调节的方案,首先分析了该合环装置的结构和工作原理,其次针对合环要求确定控制策略,交流合环中双VSC分别采用前馈解耦的双闭环控制和带前馈的电压反馈控制,直流合环中双VSC均采用双闭环控制,合环后控制策略由控直流电压改为控交流电压,进而完成负荷转供,最后在PSCAD/EMTDC环境下对采用该合环装置的10kV配电网系统进行了仿真分析,进一步验证了所提出合环方案的可行性与控制策略的有效性,通过比较两种方案各自存在的优缺点,体现出直流侧合环方案更具优势。With the development of social industries and the advancement of smart grids,users have higher requirements for power quality and power supply reliability.Therefore,the uninterrupted loop load transfer of the distribution network is of great significance.Aiming at the demand for non-stop load transfer under extreme conditions,we adopted a dual VSC flexible loop-closing device with flexible control function formed by independent STATCOMs on both sides,and proposed a solution for loop closing adjustment from the AC and DC sides.Firstly,we analyzed the structure and working principle of the loop-closing device.Secondly,the control strategy was determined according to the loop-closing requirements.The dual VSCs in the AC closing loop used feedforward decoupling dual closed loop control and feedforward voltage feedback control and the dual VSCs in the DC closing loop adopted double closed-loop control.After the loop was closed,the control strategy was changed from controlling DC voltage to controlling AC voltage so as to achieve the load transfer.Finally,the 10kV distribution network system using the loop-closing device was simulated in the PSCAD/EMTDC environment and the analysis further verified the feasibility of the proposed loop-closing scheme and the effectiveness of the control strategy.The comparison of the advantages and disadvantages of the two schemes shows that the DC side loop-closing scheme has more advantages.

关 键 词：配电网合环 负荷转供 双VSC 柔性控制 

分 类 号：TM732[电气工程—电力系统及自动化]