A Pre-Synchronization,Multiple Loops Control,and Unbalanced Load Control Strategies for Three-Phase Four-Leg Virtual Synchronous Generator
Gu Binshi1, Wang Jianhua1, Luo Fangfang1, Ji Zhendong2, Lü Zhipeng3, Gu Wei1, Wang Tao4
1. Jiangsu Provincial Key Laboratory of Smart Grid Technology and Equipment School of Electrical Engineering Southeast University Nanjing 210096 China; 2. School of Automation Nanjing University of Science and Technology Nanjing 210094 China; 3. China Electric Power Research Institute Beijing 100192 China; 4. Samil Power Co. Ltd Suqian 223800 China
Abstract：This paper designs a multiple loops control strategy for three-phase four-leg virtual synchronous generator (VSG). The decoupling control of power is used to make inverter simulate the primary frequency modulation, primary voltage modulation, inertia and excitation characteristics of synchronous generator. To improve the dynamic regulation performance of micro-grid, voltage and current double loop is cascaded after the power loop. To connect the grid smoothly, a synchronization control strategy is adopted to track the voltage frequency, phase and amplitude of grid. A variable frequency adaptive resonance control strategy is used to suppress unbalanced voltage and frequency fluctuation caused by unbalanced load. The simulation and experiments validate the effectiveness of the control strategy.
[1] 朱丹, 苏建徽, 吴蓓蓓. 基于虚拟同步发电机的微电网控制方法研究[J]. 电气自动化, 2010, 32(4): 59-62. Zhu Dan, Su Jianhui, Wu Beibei. Research on control methods of microgrid based on the virtual synchronous generators[J]. Automation of Electric Power Systems, 2010, 32(4): 59-62. [2] 吕志鹏, 盛万兴, 钟庆昌, 等. 虚拟同步发电机及其在微电网中的应用[J]. 中国电机工程学报, 2014, 34(16): 2591-2603. Lü Zhipeng, Sheng Wanxing, Zhong Qingchang, et al. Virtual synchronous generator and its applications in micro-grid[J]. Proceedings of the CSEE, 2014, 34(16): 2591-2603. [3] 张兴, 朱德斌, 徐海珍. 分布式发电中的虚拟同步发电机技术[J]. 电源学报, 2012(3): 1-6. Zhang Xing, Zhu Debin, Xu Haizhen. Review of virtualsynchronous generator technology in distributed generation[J]. Journal of Power Supply, 2012(3): 1-6. [4] 张中锋. 微网逆变器的下垂控制策略研究[D]. 南京: 南京航空航天大学, 2013. [5] Zhong Qingchang, Weiss G. Synchronverters: inverters that mimic synchronous generators[J]. IEEE Transac- tions on Industrial Electronics, 2011, 58(4): 1259- 1267. [6] Zhong Qingchang, Weiss G. Static synchronous generators for distributed generation and renewable energy[C]//Power Systems Conference and Exposition, Seattle, WA, USA, 2009: 1-6. [7] 丁明, 杨向真, 苏建徽. 基于虚拟同步发电机思想的微电网逆变电源控制策略[J]. 电力系统自动化, 2009, 33(8): 89-93. Ding Ming, Yang Xiangzhen, Su Jianhui. Control strategies of inverters based on virtual synchronous generator in a microgrid[J]. Automation of Electric Power Systems, 2009, 33(8): 89-93. [8] 陈杰, 钮博文, 张俊文, 等. 微电网运行模式平滑转换的混合控制策略[J]. 中国电机工程学报, 2015, 35(17): 4379-4387. Chen Jie, Niu Bowen, Zhang Junwen, et al. Hybrid control strategy for the seamless transfer of microgrids [J]. Proceedings of the CSEE, 2015, 35(17): 4379- 4387. [9] 陈杰, 陈新, 冯志阳, 等. 微网系统并网/孤岛运行模式无缝切换控制策略[J]. 中国电机工程学报, 2014, 34(19): 3089-3097. Chen Jie, Chen Xin, Feng Zhiyang, et al. A control strategy of seamless transfer between grid-connected and islanding operation for microgrid[J]. Proceedings of the CSEE, 2014, 34(19): 3089-3097. [10] 石荣亮, 张兴, 徐海珍, 等. 基于虚拟同步发电机的微网运行模式无缝切换控制策略[J]. 电力系统自动化, 2016, 40(10): 16-23. Shi Rongliang, Zhang Xing, Xu Haizheng, et al. Seamless switching control strategy for microgrid operation modes based on virtual synchronous generator [J]. Automation of Electric Power Systems, 2016, 40(10): 16-23. [11] 吴恒. 三相四线制虚拟同步发电机控制技术的研究[D]. 南京: 南京航空航天大学, 2015. [12] Li Chi, Burgos R, Cvetkovic I, et al. Analysis and design of virtual synchronous machine based STATCOM controller[C]//2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL), Santander, 2014: 1-6. [13] Li Chi, Burgos R, Cvetkovic I, et al. Evaluation and control design of virtual-synchronous-machine-based STATCOM for grids with high penetration of renewable energy[C]//2014 IEEE Energy Conversion Congress and Exposition(ECCE), Pittsburgh, PA, 2014: 5652-5658. [14] Nguyen P L, Zhong Q C, Blaabjerg F, et al. Synchronverter-based operation of STATCOM to mimic synchronous condensers[C]//2012 7th IEEE Conference on Industrial Electronics and Applications (ICIEA), Singapore, 2012: 942-947. [15] 王兆安, 李民, 卓放. 三相电路瞬时无功功率理论的研究[J]. 电工技术学报, 1992(3): 55-59, 39. Wang Zhaoan, Li Min, Zhuo Fang. A study on the theory of instantaneous reactive power of three-phase circuits[J]. Transactions of China Electrotechnical Society, 1992(3): 55-59, 39. [16] 孟建辉, 石新春, 王毅, 等. 改善微电网频率稳定性的分布式逆变电源控制策略[J]. 电工技术学报, 2015, 30(4): 70-79. Meng Jianhui, Shi Xinchun, Wang Yi, et al. Control strategy of DER inverter for improving frequency stability of microgrid[J]. Transactions of China Electrotechnical Society, 2015, 30(4): 70-79. [17] 吴轩钦, 谭国俊, 何凤有, 等. 变频驱动系统电网接口虚拟同步发电机控制技术[J]. 电工技术学报, 2015, 30(23): 83-92. Wu Xuanqin, Tan Guojun, He Fengyou, et al. Virtual synchronous generator control scheme of grid interface for variable frequency drive systems[J]. Transactions of China Electrotechnical Society, 2015, 30(23): 83-92. [18] 石荣亮, 张兴, 刘芳, 等. 虚拟同步发电机及其在多能互补微电网中的运行控制策略[J]. 电工技术学报, 2016, 31(20): 170-180. Shi Rongliang, Zhang Xing, Liu Fang, et al. Control technologies of multi-energy complementary microgrid operation based on virtual synchronous generator[J]. Transactions of China Electrotechnical Society, 2016, 31(20): 170-180. [19] Chen Xinran, Ruan Xinbo, Yang Dongsheng, et al. Step-by-step controller design of voltage closed-loop control for virtual synchronous generator[C]//2015 IEEE Energy Conversion Congress and Exposition (ECCE), Montreal, QC, 2015: 3760-3765. [20] 石存玮. 逆变器的三相不平衡负载控制方法研究[D]. 西南交通大学, 2014.
2017, Vol. 32 
