Cooperative Control Strategy for Modular Decoupling Circuits
Liu Yonglu1,2, Yuan Yinhao1,2, Wang Hui1, Su Mei1, Zhang Wanlu1
1. School of Automation Central South University Changsha 410083 China; 2. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China
Abstract：As an important development direction of active power decoupling (APD) technology, the modularization of active decoupling circuits has the advantages of standardization, independence, and versatility. However, the existing control strategies can only be applied to individual decoupling modules without considering the power distribution problem among multiple decoupling modules. Hence, a virtual impedance- based cooperative control strategy for multiple decoupling modules is proposed. Firstly, the impedance characteristic of a passive LC resonance circuit is analyzed: for the DC component, the resonance circuit is equivalent to an open circuit; for the double-line frequency component, it is equivalent to a short circuit, and the resonance circuit bypasses the ripple current. When the external characteristic of individual decoupling modules is controlled to be consistent with the passive LC resonance circuit, the ripple power is well buffered by decoupling modules. Meanwhile, the control of decoupling modules is independent because only one external information is needed. No unified central controller is needed, and the plug-and-play function is realized. Secondly, when considering the power distribution problem between multiple decoupling modules, the impedance characteristic of multiple passive RLC resonance circuits can be utilized. For the DC component, the RLC resonance circuit is still equivalent to an open circuit; the double-line frequency component is equivalent to a purely resistive circuit, and the ripple current flowing through each RLC resonance circuit is inversely proportional to its branch resistor. Thus, adding virtual power distribution resistors can realize the cooperative control of multiple decoupling modules without real-time communication between decoupling modules. Then, this paper introduces the concrete implementation of the proposed cooperative control strategy with typical Buck-type decoupling modules. The controller design is discussed, including the virtual power distribution resistor selection and the parameters of the decoupling voltage\current controller. Finally, a series of experiments are conducted. When two same decoupling modules work, the buffer power of each module is distributed according to the decoupling capacitance (satisfying the 1:1 distribution relationship), and the bus voltage ripple is effectively suppressed (Δvdc/Vdc<5%). When two different decoupling modules work, the buffer power of each module is distributed according to the decoupling capacitance (satisfying the 2:1 distribution relationship), and the bus voltage ripple is also suppressed. The dynamic power variation experiments show that the proposed method can achieve flexible insertion and removal of decoupling modules, which verifies the plug-and-play performance of decoupling modules without communication. Except for the transient regulation process, the rectifier input current meets the performance index (PF=0.99, THD=3.6%). According to the theoretical and experimental results, the proposed virtual impedance-based control strategy for decoupling modules relies only on the ripple information of the DC bus voltage. The decoupling power of each module is distributed in proportion to its decoupling capacitance. The problem of cooperative control is solved. The proposed control does not require the decoupling modules to interact with the main circuit for grid information, nor does it require the decoupling modules to communicate with each other. Thus, using a centralized central controller and expensive real-time communication equipment is avoided.
刘永露, 袁银浩, 王辉, 粟梅, 张莞箓. 模块化解耦电路的协同控制策略[J]. 电工技术学报, 2024, 39(10): 3118-3128.
Liu Yonglu, Yuan Yinhao, Wang Hui, Su Mei, Zhang Wanlu. Cooperative Control Strategy for Modular Decoupling Circuits. Transactions of China Electrotechnical Society, 2024, 39(10): 3118-3128.
[1] 周孝信, 鲁宗相, 刘应梅, 等. 中国未来电网的发展模式和关键技术[J]. 中国电机工程学报, 2014, 34(29): 4999-5008. Zhou Xiaoxin, Lu Zongxiang, Liu Yingmei, et al.Development models and key technologies of future grid in China[J]. Proceedings of the CSEE, 2014, 34(29): 4999-5008. [2] 钱照明, 张军明, 吕征宇, 等. 我国电力电子与电力传动面临的挑战与机遇[J]. 电工技术学报, 2004, 19(8): 10-22. Qian Zhaoming, Zhang Junming, Lü Zhengyu, et al.Challenge and opportunity for power electronics and electrical drive in China[J]. Transactions of China Electrotechnical Society, 2004, 19(8): 10-22. [3] 廖志凌, 阮新波. 半导体照明工程的现状与发展趋势[J]. 电工技术学报, 2006, 21(9): 106-111. Liao Zhiling, Ruan Xinbo.Present situation and development trend of semiconductor lighting Engin- eering[J]. Transactions of China Electrotechnical Society, 2006, 21(9): 106-111. [4] 刘晓飞, 张千帆, 崔淑梅. 电动汽车V2G技术综述[J]. 电工技术学报, 2012, 27(2): 121-127. Liu Xiaofei, Zhang Qianfan, Cui Shumei.Review of electric vehicle V2G technology[J]. Transactions of China Electrotechnical Society, 2012, 27(2): 121-127. [5] 毛玲, 张钟浩, 赵晋斌, 等. 车-桩-网交融技术研究现状及展望[J]. 电工技术学报, 2022, 37(24): 6357-6371. Mao Ling, Zhang Zhonghao, Zhao Jinbin, et al.Research status and prospects of fusion technology of vehicle-charging pile-power grid[J]. Transactions of China Electrotechnical Society, 2022, 37(24): 6357-6371. [6] Wang Huai, Liserre M, Blaabjerg F.Toward reliable power electronics: challenges, design tools, and opportunities[J]. IEEE Industrial Electronics Magazine, 2013, 7(2): 17-26. [7] 潘启军, 黄垂兵, 邓晨, 等. 电解电容与薄膜电容的对比分析[J]. 海军工程大学学报, 2014, 26(2): 5-9. Pan Qijun, Huang Chuibing, Deng Chen, et al.Comparative analysis of electrolytic capacitor and thin film capacitor[J]. Journal of Naval University of Engineering, 2014, 26(2): 5-9. [8] Sun Yao, Liu Yonglu, Su Mei, et al.Review of active power decoupling topologies in single-phase systems[J]. IEEE Transactions on Power Electronics, 2016, 31(7): 4778-4794. [9] Zhang Jianhua, Ding Hao, Wang Baocheng, et al.Active power decoupling for current source con- verters: an overview scenario[J]. Electronics, 2019, 8(2): 197. [10] 李红波, 张凯, 赵晖, 等. 基于功率解耦的高功率密度单相整流器[J]. 电工技术学报, 2011, 26(增刊1): 77-82. Li Hongbo, Zhang Kai, Zhao Hui, et al.A high power density single rectifier with power decoupling function[J]. Transactions of China Electrotechnical Society, 2011, 26(S1): 77-82. [11] 王立乔, 崔舒敏, 陈梅. 功率解耦型无电解电容 PFC电路并联补偿控制[J]. 电工技术学报, 2019, 34(3): 516-528. Wang Liqiao, Cui Shumin, Chen Mei.Parallel compensation control of power factor corrector without electrolytic capacitor by power decoup- ling[J].Transactions of China Electrotechnical Society, 2019, 34(3): 516-528. [12] 王舒, 阮新波, 姚凯, 等. 无电解电容无频闪的 LED驱动电源[J]. 电工技术学报, 2012, 27(4): 173-178. Wang Shu, Ruan Xinbo, Yao Kai, et al.A novel LED driver without electrolytic capacitor and flicker[J]. Transactions of China Electrotechnical Society, 2012, 27(4): 173-178. [13] 彭寥廓, 陈艳慧. 单相全桥离网逆变器输出侧功率解耦电路研究[J]. 电气技术, 2022, 23(1): 42-48, 55. Peng Liaokuo, Chen Yanhui.Research on a single- phase full-bridge off-grid inverter with active power decoupling circuit at output side[J]. Electrical Engin- eering, 2022, 23(1): 42-48, 55. [14] Liu Yonglu, Zhang Wanlu, Sun Yao, et al.Review and comparison of control strategies in active power decoupling[J]. IEEE Transactions on Power Elec- tronics, 2021, 36(12): 14436-14455. [15] 童时中. 模块化的概念与定义[J]. 电力技术, 1995, 4(4): 22-25. Tong Shizhong.Concept and definition of modulari- zation[J]. Electric Power Technology, 1995, 4(4): 22-25. [16] 丁国臣, 张芳, 杨晓霞, 等. 一种AC/DC开关电源的模块化设计[J]. 电工技术, 2021(8): 69-71, 74. Ding Guochen, Zhang Fang, Yang Xiaoxia, et al.A modular design of AC/DC switching power supply[J]. Electric Engineering, 2021(8): 69-71, 74. [17] 王要强, 李娜, 赵朝阳, 等. 一种新型多电平逆变器及其模块化分析[J]. 电工技术学报, 2022, 37(18): 4676-4687. Wang Yaoqiang, Li Na, Zhao Chaoyang, et al.A new type of multilevel inverter and its modular analysis[J]. Transactions of China Electrotechnical Society, 2022, 37(18): 4676-4687. [18] 杨珺, 侯俊浩, 刘亚威, 等. 分布式协同控制方法及在电力系统中的应用综述[J]. 电工技术学报, 2021, 36(19): 4035-4049. Yang Jun, Hou Junhao, Liu Yawei, et al.Distributed cooperative control method and application in power system[J]. Transactions of China Electrotechnical Society, 2021,36(19): 4035-4049. [19] 张昊, 李昱, 尹亚飞, 等. 直流微电网集成式高品质协同控制策略[J]. 电工技术学报, 2022, 37(3): 697-706. Zhang Hao, Li Yu, Yin Yafei, et al.An integrated high-quality cooperative control strategy of DC microgrids[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 697-706. [20] Li Sinan, Lee A T L, Tan S C, et al. Plug-and-play voltage ripple mitigator for DC links in hybrid AC-DC power grids with local bus-voltage control[J]. IEEE Transactions on Industrial Electronics, 2018, 65(1): 687-698. [21] Mutovkin A, Yuhimenko V, Mellincovsky M, et al.Control of direct voltage regulated active DC-link capacitance reduction circuits to allow plug-and-play operation[J]. IEEE Transactions on Industrial Elec- tronics, 2019, 66(8): 6527-6537. [22] Li Sinan, Qi Wenlong, Tan S C, et al.A general approach to programmable and reconfigurable emulation of power impedances[J]. IEEE Transa- ctions on Power Electronics, 2018, 33(1): 259-271. [23] Lin Jun, Weiss G.An indirect approach to control an active capacitor[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, 8(3): 2898-2906.
2024, Vol. 39 
