Abstract：For the scalability and reliability of the whole system, it has more advantages for several small power inverters parallel than a single high power inverter. This paper proposes a simplified control method based on virtual impedance control loop for the inverters parallel operation. It can balance the current distribution of individual inverters without communication lines, and restrain the internal circulating current. In order to verify the proposed method, the parallel topology of two inverters is introduced in this paper, and the performance of this method is also verified by simulations and experiments.
温春雪, 李正熙. 基于虚拟电阻控制环的并联逆变器简化控制方法[J]. 电工技术学报, 2012, 27(6): 63-68.
Wen Chunxue, Li Zhengxi. A Simplified Control Method of Parallel Inverters Based on Virtual Impedance Control Loop. Transactions of China Electrotechnical Society, 2012, 27(6): 63-68.
[1] Kwak S, Toliyat H A. Parallelized inverters configuration with current and voltage sources for high power applications[C]. Proceedings of the Power Electronics Specialists Conference, 2006: 1-7. [2] Okui Y, Ohta S, Nakamura N, et al. Development of parallel processing type UPS using a novel independent control for parallel-connected UPS units[C]. Proceedings of the Telecommunications Energy Conference, 2009: 1-8. [3] Chen Kai Yu, Wu Yu En, Wu Tsai Fu, et al. ACSS for paralleled multi-inverter systems with DSP-based robust control[J]. Aerospace and Electronic Systems, 2003, 39(3): 1002-1015. [4] Mazumder S K. Continuous and discrete variable- structure controls for parallel three-phase boost rectifier[J]. IEEE Transactions and Electron, 2005, 52(2): 340-354. [5] 马皓, 雷彪. 逆变器无连线并联系统的统一小信号模型及应用[J]. 浙江大学学报(工学版), 2007, 41(7): 1111-1115. Ma Hao, Lei Biao. Generalized small-signal model and its application for wireless-parallel inverter systems[J]. Journal of Zhejiang University (Engineering Science), 2007, 41(7): 1111-1115. [6] Liao Hua, Wu Chunsheng. A voltage stability droop control strategy of wireless parallel inverters[C]. Proceedings of the Electrical and Control Engineering, 2010: 4978-4981. [7] De Brabandere K, Bolsens B, Van den Keybus J. et al. A voltage and frequency droop control method for parallel inverters[C]. Proceedings of the Power Electronics Specialists Conference 2004, 4: 2501-2507. [8] Guerrero Josep M, Berbel Nestor, Matas Jose, et al. Droop control method with virtual output impedance for parallel operation of uninterruptible power supply systems in a microgrid[C]. Proceedings of the Applied Power Electronics Conference, 2007: 1126-1132. [9] Wu K D, Wu J C, Jou H L, et al. Simplified control method for parallel-connected DC-AC inverters[J]. IEE Proceedings Electric Power Application 2006, 153(6): 787-792. [10] 陈晶晶, 陈敏, 姚玮. 无线并联逆变器的输出阻抗设计[J]. 电力电子技术, 2007, 41(12): 63-65. Chen Jingjing, Chen Min, Yao Wei. Output impedence design of wireless parallel-connected inverters[J]. Power Electronics. 2007, 41(12): 63-65. [11] Shungang Xu, Jianping Xu. Parallel control strategy of single-phase inverter based on virtual impedance[C]. Proceedings of the Communications, Circuits and Systems International Conference, 2010: 589-592. [12] Kan Zhizhong, Zhang Chunjiang, Zhang bo. et al. Analysis of the conflict between close-loop control and the current-sharing of ac parallel inverters and parallel control strategy[C]. Proceedings of the Power Electronics and Motion Control Conference, 2009: 368-372. [13] 鞠洪新, 邹昭平, 梁海. 基于瞬时电感电流控制的无线并联逆变系统[J]. 电工技术学报, 2010, 25(3): 97-101. Ju Hongxin, Zou Zhaoping, Liang Hai. No interconnection parallel inverter system based on instantaneous inductive current control[J]. Transactions of China Electrotechnical Society. 2010, 25(3): 97-101. [14] 余蜜, 张宇, 康勇, 等. 基于改变环流阻抗的并联解耦控制策略[J]. 电工技术学报, 2008, 23(10): 58-63, 68. Yu Mi, Zhang Yu, Kang Yong, et al. A decoupled current-sharing strategy based on circulating- impedance in parallel operation[J]. Transactions of China Electrotechnical Society. 2010(3): 97-101. [15] Shenkman A L, Axelrod B, Chudnovsky V. A new simplified model of the dynamics of the current-fed parallel resonant inverter[C]. Proceedings of the IEEE Transactions Industrial Electronics, 2000(47): 282- 286. [16] Itkonen Toni, Rauma Kimmo, Saren Hannu, et al. Parallel-connected voltage source inverters without intermodule reactors[C]. Proceedings of the Power Electronics and Motion Control Conference, 2006: 641-646.
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