Grid Current Feedforward Based Phase-locked Loop for Single-phase-inverters in Weak Grid Case

被引:0
作者
Xu J. [1 ]
Bian S. [1 ]
Qian Q. [1 ]
Xie S. [1 ]
机构
[1] College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, Jiangsu Province
来源
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 08期
基金
中国国家自然科学基金;
关键词
Grid impedance; Harmonic distortion; Inverters; Phase-locked loops; Robustness;
D O I
10.13334/j.0258-8013.pcsee.190620
中图分类号
学科分类号
摘要
For the single-phase inverters, the delay-based PLL is being widely used to make inverters to be synchronized with the grid. But, if the grid at the point of common coupling (PCC) behaves a large grid impedance, the inverter with the delay-based phase-locked loop (PLL) cannot work well. Hence, this study aims to formulate a robust PLL under the large grid impedance. At first, through the inverter impedance modelling, the stability of the typical delay-based PLL has been analyzed and the reason for the harmonics and instabilities has been explained. Then, based on analyzing the differences of PLL blocks under different PCC conditions, the grid current feedforward based PLL was proposed. Compared with the typical PLL, the proposed PLL equivalently adds series impedance at the inverter output, and thus improves the behaviors in weak grid cases. The design of parameters has been proposed. Selected waveforms have demonstrated that the inverter can perform well in the very weak grid case. © 2020 Chin. Soc. for Elec. Eng.
引用
收藏
页码:2647 / 2656
页数:9
相关论文
共 28 条
  • [1] Xu J., Ji L., Ge X., Et al., LCL-filter optimization design with consideration of inverter-side current feedback control impacts, Proceedings of CSEE, 36, 17, pp. 4656-4664, (2016)
  • [2] Sanatkar-Chayjani M., Monfared M., Stability analysis and robust design of LCL with multituned traps filter for grid-connected converters, IEEE Transactions on Industrial Electronics, 63, 11, pp. 6823-6834, (2016)
  • [3] Wang J., Yan J., Jiang L., Et al., Delay-dependent stability of single-loop controlled grid-connected inverters with LCL filters, IEEE Transactions on Power Electronics, 31, 1, pp. 743-757, (2016)
  • [4] Fantino R.A., Busada C.A., Solsona J.A., Optimum PR control applied to LCL filters with low resonance frequency, IEEE Transactions on Power Electronics, 33, 1, pp. 793-801, (2018)
  • [5] Xu J., Xie S., Tang T., Active damping-based control for grid-connected LCL-filtered inverter with injected grid current feedback only, IEEE Transactions on Industrial Electronics, 61, 9, pp. 4746-4758, (2014)
  • [6] Zhou L., Luo A., Chen Y., Et al., A robust grid-current-feedback-active-damping method for LCL-type grid-connected inverters, Proceedings of the CSEE, 36, 10, pp. 2742-2752, (2016)
  • [7] Li W., Ruan X., Pan D., Et al., Full-feedforward schemes of grid voltages for a three-phase LCL-type grid-connected Inverter, IEEE Transactions on Industrial Electronics, 60, 6, pp. 2237-2250, (2013)
  • [8] Karimi-Ghartemani M., Linear and pseudolinear enhanced phased-locked loop (EPLL) structures, IEEE Transactions on Industrial Electronics, 61, 3, pp. 1464-1474, (2014)
  • [9] Han Y., Luo M., Zhao X., Et al., Comparative performance evaluation of orthogonal-signal-generators-based single-phase PLL algorithms: a survey, IEEE Transactions on Power Electronics, 31, 5, pp. 3932-3944, (2016)
  • [10] Sang S., Gao N., Cai X., Et al., Operation control and stability study of converters for battery energy storage under weak grid conditions, Proceedings of the CSEE, 37, 1, pp. 54-63, (2017)