[1]万晓凤,丁小华,聂晓艺,等.LCL型并网逆变器的改进数字单环控制技术[J].深圳大学学报理工版,2017,34(No.6(551-660)):577-583.[doi:10.3724/SP.J.1249.2017.06577]
 Wan Xiaofeng,Ding Xiaohua,Nie Xiaoyi,et al.An improved digital single-loop control scheme for grid-connected inverters with LCL filter[J].Journal of Shenzhen University Science and Engineering,2017,34(No.6(551-660)):577-583.[doi:10.3724/SP.J.1249.2017.06577]
点击复制

LCL型并网逆变器的改进数字单环控制技术()
分享到:

《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第34卷
期数:
2017年No.6(551-660)
页码:
577-583
栏目:
电子与信息科学
出版日期:
2017-11-20

文章信息/Info

Title:
An improved digital single-loop control scheme for grid-connected inverters with LCL filter
文章编号:
201706005
作者:
万晓凤丁小华聂晓艺刘志宇胡海林余运俊
南昌大学信息工程学院,江西南昌 330031
Author(s):
Wan Xiaofeng Ding Xiaohua Nie Xiaoyi Liu Zhiyu Hu Hailin and Yu Yunjun
Information Engineering School, Nanchang University, Nanchang 330031, Jiangxi Province, P.R.China
关键词:
分布式电力技术LCL型并网逆变器单环控制数字控制延时脉宽调制超前补偿器
Keywords:
distributed power technology LCL-type grid-connected inverter single-loop control digital control delay pulse width modulation lead-leg compensator
分类号:
TM 46
DOI:
10.3724/SP.J.1249.2017.06577
文献标志码:
A
摘要:
建立逆变侧电流单环反馈控制LCL型并网逆变器数学模型,研究数字控制延时对系统稳定性的影响,得出系统稳定控制下的约束延时区间.为减小数字控制延时,通过前移脉宽调制比较寄存器装载时刻的方法,在未提高采样频率的情况下将采样延时减小为采样周期的1/2,使系统达到临界稳定状态;对比分析结果表明,采用参数优化的方法对传统相位补偿算法进行改进,在提高系统相位裕度的同时能降低系统高频增益,提高系统稳定性.仿真和实验结果验证了改进方法的有效性.
Abstract:
We establish a mathematical model of LCL-type grid-connected inverter with single-loop control of the inverter-side current and obtain the constraint delay interval of stable system by analyzing the relationship between the digital control delay and system stability. In order to reduce the digital control delay, we decrease the sampling delay from one sampling period to 1/2 sampling period and make the system reach the critical stable state without increasing the sampling frequency by moving forward the register loading time of the pulse width modulation. It is found that compared with the traditional compensation algorithm based on lead-leg compensator, the adoption of parameter optimization method in this paper can not only improve phase margin, but also reduce the high frequency gain of the system, thus increasing stability of the system. The experimental results demonstrate the feasibility of the proposed control strategy.

参考文献/References:

[1] Chi Zhang, Dragicevic T, Vasquez J C, et al. Resonance damping techniques for grid-connected voltage source converters with LCL filters: a review[C]// IEEE International Energy Conference. Cavtat, Croatia: IEEE, 2014: 169-176.
[2] 许津铭,谢少军,肖华锋.LCL滤波器有源阻尼控制机制研究[J].中国电机工程学报,2012,32(9):27-33.
Xu Jinming, Xie Shaojun, Xiao Huafeng. Research on control mechanism of active damping for LCL filters[J]. Proceedings of the CSEE, 2012, 32(9): 27-33.(in Chinese)
[3] Bao Chenlei, Ruan Xinbo, Wang Xuehua, et al. Step-by-step controller design for LCL-type grid-connected inverter with capacitor-current-feedback active-damping[J]. IEEE Transactions on Power Electronics, 2014, 29(3): 1239-1253.
[4] Pan Donghua, Ruan Xinbo, Bao Chenlei, et al. Capacitor-current-feedback active damping with reduced computation delay for improving robustness of LCL-type grid-connected inverter[J]. IEEE Transactions on Power Electronics, 2014, 29(7): 3414-3427.
[5] Yang Dongsheng, Ruan Xinbo, Wu Heng. A real-time computation method with dual sampling modes to improve the current control performance of the LCL-type grid-connected inverter[J]. IEEE Transactions on Industrial Electronics, 2015, 62(7): 4563-4572.
[6] Wagner M, Barth T, Alvarez R, et al. Discrete-time active damping of resonance by proportional capacitor current feedback[J]. IEEE Transactions on Industry Applications, 2014, 50(6): 3911-3920.
[7] 邹常跃,刘邦银,段善旭,等.并网逆变器中数字控制延时对系统稳定性的影响及其优化设计[J].中国电机工程学报,2015,35(2):411-417.
Zou Changyue, Liu Bangyin, Duan Shanxu. Influence of delay on system stability and its optimization in grid-connected inverters[J]. Proceedings of the CSEE, 2015, 35(2): 411-417.(in Chinese)
[8] 张兴,陈鹏,余畅舟,等.LCL滤波并网逆变器逆变侧电流多次采样的单闭环控制策略[J].电力系统自动化,2016(11):87-92.
Zhang Xing, Chen Peng, Yu Changzhou, et al. Single closed-loop strategy based on multi-sampled inverter side currents for grid-connected inverters with LCL filters[J]. Automation of Electric Power Systems, 2016(11): 87-92.(in Chinese)
[9] 盘宏斌,欧思程,刘林海,等.LCL型并网逆变器数字单环控制延时影响与稳定域分析设计[J].电力系统自动化,2016,40(6):85-90.
Pan Hongbin, Ou Sicheng, Liu Linhai, et al. Influence on delay and stable domain analysis and design based on digital single-loop control of grid-connected inverter with LCL-filter[J].Automation of Electric Power Systems,2016,40(6): 85-90.(in Chinese)
[10] Wang Jianguo, Yan Jiudun, Zou Jiyan. Inherent damping of single-loop digitally controlled voltage source inverters with LCL filters[J]. IEEE, International Symposium on Industrial Electronics, 2016:487-492.
[11] Zhang Xiaotian, Spencer J W, Guerrero J M. Small-signal modeling of digitally controlled grid-connected inverters with LCL filters[J]. IEEE Transactions on Industrial Electronics, 2013, 60(9): 3752-3765.
[12] Dannehl J, Liserre M, Fuchs F W. Filter-based active damping of voltage source converters with filter[J].IEEE Transactions on Industrial Electronics, 2011, 58(8): 3623-3633.
[13] 许津铭,季林,葛小伟,等.计及逆变器侧电流反馈影响的LCL滤波器参数优化设计[J].中国电机工程学报,2016,36(17):4656-4664.
Xu Jinming, Ji Lin, Ge Xiaowei, et al. LCL-filter optimization design with consideration of inverter-side current feedback control impacts[J]. Proceedings of the CSEE, 2016, 36(17): 4656-4664.(in Chinese)
[14] Wang Jianguo, Yan Jiudun, Jiang Lin, et al. Delay-dependent stability of single-loop controlled grid-connected inverters with LCL filters[J]. IEEE Transactions on Power Electronics, 2015, 31(1): 743-756.
[15] Jalili K, Bernet S. Design of filters of active-front-end two-level voltage-source converters[J]. IEEE Transactions on Industrial Electronics, 2009, 56(5): 1674-1689.
[16] 李泽斌,罗安,田园,等.LCL型光伏并网逆变器电流内环控制方法[J].电网技术,2014,38(10):2772-2778.
Li Zebin, Luo An, Tian Yuan, et al. Inner current loop control method for photovoltaic grid-connected inverter with LCL filter[J].Power System Technology, 2014, 38(10):2772-2778.(in Chinese)
[17] Pan Donghua, Ruan Xinbo, Wang Xuehua, et al. Analysis and design of current control schemes for LCL-type grid-connected inverter based on a general mathematical model[J]. IEEE Transactions on Power Electronics, 2017, 32(6): 4395-4410.
[18] Yepes A G, Vidal A, Malvar J, et al. Tuning method aimed at optimized settling time and overshoot for synchronous proportional-integral current control in electric machines[J]. IEEE Transactions on Power Electronics, 2014, 29(6): 3041-3054.
[19] 阚加荣,谢少军,吴云亚,等.逆变器侧电流反馈的LCL滤波并网逆变器参数设计[J].电力系统自动化,2013,37(17):119-124.
Kan Jiarong, Xie Shaojun, Wu Yunya, et al. Parameter design of LCL filter grid-connected inverter using inverter-side current feedback strategy[J].Automation of Electric Power Systems,2013, 37(17): 119-124.(in Chinese)
[20] Pan Donghua, Ruan Xinbo, Bao Chenlei, et al. Optimized controller design for LCL-type grid-connected inverter to achieve high robustness against grid-impedance variation[J]. IEEE Transactions on Industrial Electronics, 2015, 62(3): 1537-1547.
[21] Liserre M, Teodorescu R, Blaabjerg F. Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values[J]. IEEE Transactions on Power Electronics, 2006, 21(1): 263-272.

备注/Memo

备注/Memo:
Received:2017-01-10;Accepted:2017-05-09
Foundation:National International Cooperation Foundation of Science and Technology of China(2014DFG72240);Science and Technology Land Plan of Jiangxi Province(KJLD14006); Graduate Innovation Foundation of Jiangxi Province(YC2016-S009)
Corresponding author:Professor Wan Xiaofeng. E-mail: xfwan_jx@163.com
Citation:Wan Xiaofeng, Ding Xiaohua, Nie Xiaoyi, et al. An improved digital single-loop control scheme for grid-connected inverters with LCL filter[J]. Journal of Shenzhen University Science and Engineering, 2017, 34(6): 577-583.(in Chinese)
基金项目:国家国际科技合作专项资助项目(2014DFG72240);江西省高等学校科技落地计划项目( KJLD14006);江西省研究生创新专项资金资助项目(YC2016-S009))
作者简介:万晓凤(1964—),女,南昌大学教授、博士生导师.研究方向:分布式发电与微电网、储能及其应用研究.E-mail:xfwan_jx@163.com
引文:万晓凤,丁小华,聂晓艺,等.LCL型并网逆变器的改进数字单环控制技术[J]. 深圳大学学报理工版,2017,34(6):577-583.
更新日期/Last Update: 2017-10-10