Abstract：This paper presents a global high-frequency oscillation suppression method for multi-inverter grid-connected system in weak grid. By introducing the global voltage variable of point of common coupling(PCC) and the high-frequency component of grid-connected current into the inverter control, the high-frequency oscillation suppression of multi-inverter system can be realized. Firstly, the virtual resistance of the paralleled inverter at the PCC was constructed by introducing the feedforward of the PCC voltage, which restrained the harmonic resonance of the impedance network caused by the harmonic voltage of the inverter and the background harmonic voltage of the grid. Secondly, the high-frequency component of grid-connected current was introduced to construct the virtual impedance paralleled to the output filter capacitor of the inverter, which increased the damping of the inverter and restrained the oscillation of the paralleled inverters. Simulations and experiments verified the effectiveness of the proposed method.
谢志为, 陈燕东, 伍文华, 王翔宇, 王自力. 弱电网下多逆变器并网系统的全局高频振荡抑制方法[J]. 电工技术学报, 2020, 35(4): 885-895.
Xie Zhiwei, Chen Yandong, Wu Wenhua, Wang Xiangyu, Wang Zili. A Global High-Frequency Oscillation Suppression Method for Multi-Inverter Grid-Connected System in Weak Grid. Transactions of China Electrotechnical Society, 2020, 35(4): 885-895.
[1] 陈燕东, 王伊, 周乐明, 等. 弱电网下LCL逆变器阻尼谐振抑制与功率快速调节方法[J]. 电工技术学报, 2018, 33(11): 2564-2574. Chen Yandong, Wang Yi, Zhou Leming, et al.Damping resonance suppression and fast power regulation method for LCL-type inverter under weak grid[J]. Transactions of China Electrotechnical Society, 2018, 33(11): 2564-2574. [2] 陈燕东, 罗安, 陈智勇, 等. 一种快速无功支撑的阻容性逆变器并联控制方法[J]. 中国电机工程学报, 2014, 34(30): 5296-5305. Chen Yandong, Luo An, Chen Zhiyong, et al.A rapid reactive power control method for parallel inverters using resistive-capacitive output impedance[J]. Pro- ceedings of the CSEE, 2014, 34(30): 5296-5305. [3] Wu Wenhua, Chen Yandong, Luo An, et al.A virtual inertia control strategy for DC microgrids analogized with virtual synchronous machines[J]. IEEE Transa- ctions on Industrial Electronics, 2017, 64(7): 6005-6016. [4] 方天治, 张先云, 黄淳, 等. 输入串联输出并联LCL型并网逆变器系统的目标多重化控制策略[J]. 电工技术学报, 2019, 34(6): 1189-1200. Fang Tianzhi, Zhang Xianyun, Huang Chun, et al.Control strategy to reach multiple objectives for input-series output-parallel LCL-type grid-connected inverter system[J]. Transactions of China Electro- technical Society, 2019, 34(6): 1189-1200. [5] Chen Yandong, Xie Zhiwei, Zhou Leming, et al.Optimized design method for grid-current-feedback active damping to improve dynamic characteristic of LCL-type grid-connected inverter[J]. International Journal of Electrical Power & Energy Systems, 2018, 100: 19-28. [6] 李维波, 徐聪, 许志豪, 等. 基于自适应虚拟阻抗的舰用逆变器并联策略[J]. 高电压技术, 2019, 45(8): 2538-2544. Li Weibo, Xu Cong, Xu Zhihao, et al.Inverter parallel control strategy based on variable virtual impedance[J]. High Voltage Engineering, 2019, 45(8): 2538-2544. [7] 陈杰, 刘名凹, 陈新, 等. 基于下垂控制的逆变器无线并联与环流抑制技术[J]. 电工技术学报, 2018, 33(7): 1450-1460. Chen Jie, Liu Ming’ao, Chen Xin, et al.Wireless parallel and circulation current reduction of droop- controlled inverters[J]. Transactions of China Electrotechnical Society, 2018, 33(7): 1450-1460. [8] 朴政国, 户永杰, 郭裕祺. 一种基于并联谐振的高频隔离型并网逆变器[J]. 电工技术学报, 2018, 33(2): 322-330. Piao Zhengguo, Hu Yongjie, Guo Yuqi.High- frequency isolated grid-connected inverter based on parallel resonance[J]. Transactions of China Electro- technical Society, 2018, 33(2): 322-330. [9] 严干贵, 常青云, 黄亚峰, 等. 弱电网接入下多光伏逆变器并联运行特性分析[J]. 电网技术, 2014, 38(4): 933-940. Yan Gangui, Chang Qingyun, Huang Yafeng, et al.Analysis on parallel operational characteristics of multi photovoltaic inverters connected to weak- structured power system[J]. Power System Tech- nology, 2014, 38(4): 933-940. [10] Juan L A, Mikel B, Jesus L, et al.Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PV plants[J]. IEEE Transactions on Power Electronics, 2011, 26(3-4): 770-785. [11] 姚骏, 谭义, 杜红彪, 等. 孤岛模式下逆变器并联系统的谐振特性分析及其抑制策略研究[J]. 电工技术学报, 2016, 31(23): 199-210. Yao Jun, Tan Yi, Du Hongbiao, et al.Analysis of resonant characteristics and resonance suppression strategy of inverter parallel system in islanding mode[J]. Transactions of China Electrotechnical Society, 2016, 31(23): 199-210. [12] 方天治, 黄淳, 陈乃铭, 等. 一种提高弱电网下LCL型并网逆变器鲁棒性的相位超前补偿策略[J]. 电工技术学报, 2018, 33(20): 4813-4822. Fang Tianzhi, Huang Chun, Chen Naiming, et al.A phase-lead compensation strategy on enhancing robustness of LCL-type grid-tied inverters under weak grid conditions[J]. Transactions of China Elec- trotechnical Society, 2018, 33(20): 4813-4822. [13] 陈新, 韦徵, 胡雪峰, 等. 三相并网逆变器LCL滤波器的研究及新型有源阻尼控制[J]. 电工技术学报, 2014, 29(6): 71-79. Chen Xin, Wei Zheng, Hu Xuefeng, et al.Research on LCL filter in three-phase grid-connected inverter and novel active damping control strategy[J]. Transa- ctions of China Electrotechnical Society, 2014, 29(6): 71-79. [14] Martin W, Tobias B, Rodrigo A, et al.Discrete-time active damping of LCL-resonance by proportional capacitor current feedback[J]. IEEE Transactions Industry Applications, 2014, 50(6): 3911-3920. [15] Liu Huakun, Xie Xiaorong, Li Yu, et al.Mitigation of SSR by embedding subsynchronous notch filters into DFIG converter controllers[J]. IET Generation Trans- mission & Distribution, 2017, 11(11): 2888-2896. [16] Mauricio Cespedes, Sun Jian.Mitigation of inverter- grid harmonic resonance by narrow-band damping[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2014, 2(4): 1024-1031. [17] 曾正, 赵荣祥, 吕志鹏, 等. 光伏并网逆变器的阻抗重塑与谐波谐振抑制[J]. 中国电机工程学报, 2014, 34(27): 4547-4558. Zeng Zheng, Zhao Rongxiang, Lü Zhipeng, et al.Impedance reshaping of grid-tied inverters to damp the series and parallel harmonic resonances of photovoltaic systems[J]. Proceedings of the CSEE, 2014, 34(27): 4547-4558. [18] Malinowski M, Bernet S.A simple voltage sensorless active damping scheme for three-phase PWM con- verters with an LCL filter[J].IEEE Transactions on Industry Electronics, 2008, 55(4): 1876-1880. [19] 陈东, 张军明, 钱照明. 带LCL滤波器的并网逆变器单电流反馈控制策略[J]. 中国电机工程学报, 2013, 33(9): 10-16. Chen Dong, Zhang Junming, Qian Zhaoming.Single current feedback control strategy for grid-connected inverters with LCL filters[J]. Proceedings of the CSEE, 2013, 33(9): 10-16.
2020, Vol. 35 
