用于储能变流器的改进型VSG控制方法  

An Improved VSG Control Method for Energy Storage Converters

作　　者：杨波 冯鑫振[2] 王德顺[2] 余涛[3] 张宸宇 YANG Bo;FENG Xinzhen;WANG Deshun;YU Tao;ZHANG Chenyu(State Key Laboratory of Operation and Control of Renewable Energy ＆ Storage Systems, China Electric Power Research Institute, Beijing 100192, China;Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application, China Electric Power Research Institute, Nanjing 210003, China;State Grid Changzhou Power Supply Company, Changzhou 213003, Jiangsu Province, China;State Grid Jiangsu Electric Power Co. , Ltd. Research Institute, Nanjing 211103, China)

机构地区：[1]新能源与储能运行控制国家重点实验室(中国电力科学研究院有限公司),北京市100192 [2]中国电力科学研究院江苏省储能变流及应用工程技术研究中心,南京市210003 [3]国网常州供电公司,江苏省常州市213003 [4]国网江苏省电力有限公司电力科学研究院,南京市211103

出　　处：《电力建设》2018年第4期126-132,共7页Electric Power Construction

基　　金：国网江苏省电力有限公司科技项目"储能提高规模化光伏发电消纳和用户用电质量的关键技术研究"

摘　　要：文章提出一种改进型虚拟同步机(virtual synchronous generator,VSG)控制方法应用于交流微网环境下的储能变流器。针对传统VSG存在的有功功率振荡问题,加入虚拟电抗模块,以实际同步机的典型直轴暂态电抗为目标值来调节VSG对外表现电抗,提高系统的阻尼系数,实现有功功率振荡的抑制。针对传统VSG存在的无功功率分配不合理问题,提出采用稳定的交流母线电压作为励磁控制的参考值,给出通过机端电压以及线路参数估算母线电压的方法,并分析选取合适的下垂系数,实现有功和无功功率解耦,且输出无功功率能够按各机容量比精确分配。最后使用M ATLAB/Simulink平台进行仿真,将该方法与传统VSG控制进行对比,验证所提控制策略的有效性与优越性。This paper proposes the control method of improved VSG（ virtual synchronous generator） control method applied to energy storage converter in AC microgrid. According to the problem of active power oscillation in traditional VSG,a virtual reactance module is added to adjust VSG external characteristic reactance with the typical direct-axis transient reactance of synchronous machine as the target value. It can improve the virtual damping coefficient of VSG,and realize the reduction of active power oscillation. According to the problem of irrational reactive power distribution in traditional VSG,the stable AC bus voltage is used as the referencial voltage in excitation control,the method of estimating bus voltage through machine terminal voltage and line parameters is presented. The reasonable droop gain is analyzed and chosen,which realizes the active reactive power decoupling and the rational share of reactive power. Meanwhile,the output power of reactive power can be accurately distributed according to the capacity ratio of each machine. Finally,the simulation system using the proposed method and traditional VSG control is built with MATLAB/Simulink,the effectiveness and superiority of the proposed scheme is verified.

关 键 词：储能变流器 VSG控制 虚拟电抗 母线电压估计 

分 类 号：TM46[电气工程—电器]