Abstract
Due to the traditional grid-connected current control method of single Proportional Integral (PI) and Repetitive Control (RC) strategies, the photovoltaic inverter output current will have a distortion problem, which can not only maintain the stability of the whole photovoltaic system, but also the current quality of the photovoltaic inverter grid-connected system is reduced in the case of high-order LCL photovoltaic inverter control system operation. So, a strategy of PI + repetitive control in two-phase stationary frame is proposed. The introduction of the weighting coefficient m of the PI controller branch can enhance the adjustment ability of the PI link and accelerate the responding speed to meet the dynamic characteristics of the entire operating system, while the other weighting coefficient n on the repetitive controller branch can increase the correction capability and eliminate the steady-state error to meet system steady-state requirements. The scheme not only simplifies the coordinate transformation and decoupling calculation process, but also improves the harmonics suppression ability of the photovoltaic inverter and reduces the total harmonic distortion rate of the grid-connected current. At the same time, with the load operation mode change, the system can also retain better stability and keep a fast dynamic response capability, and the grid current can be able to return to a stable state in one cycle. Finally, the effectiveness of theoretical analysis and the strategy is verified by simulation.
Similar content being viewed by others
References
Bessa RJ, Trindade A, Miranda V (2015) Spatial-temporal solar power forecasting for smart grids. IEEE Trans Ind Inf 11(01):232–241
Cai H, Xiang J, Wei Wei (2018) Decentralized coordination control of multiple photovoltaic sources for DC bus voltage regulating and power sharing. IEEE Trans Ind Electron 65(07):5601–5610
Chen L, Mei S (2015) An integrated control and protection system for photovoltaic microgrids. CSEE J Power Energy Syst 1(01):36–42
Chen D, Zhang J, Qian Z (2013) An improved repetitive control scheme for grid-connected inverter with frequency-adaptive capability. IEEE Trans Ind Electron 60(2):814–823
Chen D, Cheng J, Hu Y et al (2017) Analysis and design of fast-transient strategy based on modified fast repetitive control for shunt active power filter. In: International symposium on industrial electronics, pp 19–21
Cheng YH, Chen K, Bai LB et al (2014) Improvement of the grid-connect current quality using novel proportional-integral controller for photovoltaic inverters. Rev Sci Instrum 85(02):12–16
Fan P, Huang S, Wang H et al (2018) From chip to inverter: electro-thermal modeling and design for paralleled power devices in high power application. Microelectron Reliab 87(02):271–277
Gao YG, Jiang FY, Song JC et al (2018) A novel dual closed-loop control scheme based on repetitive control for grid-connected inverters with an LCL filter. ISA Trans 74(01):1194–1208
Hao L, Wang Q, Chen Q et al (2014) Voltage differential feedback control for three-phase PV inverter based on repetitive control. Power Electron Distrib Gener Syst 30(08):24–27
Hassaine L, Olías E, Quintero J et al (2014) Power control for grid connected applications based on the phase shifting of the inverter output voltage with respect to the grid voltage. Int J Electr Power Energy Syst 57(12):250–260
He J, Li YW, Blaabjerg F et al (2014) Active harmonic filtering using current-controlled, grid-connected dg units with closed-loop power control. IEEE Trans Power Electron 29(02):642–653
Kumar R, Bansal HO (2019) Real-time implementation of adaptive PV-integrated SAPF to enhance power quality. Int Trans Electr Energy Syst 29(5):1–22
Pan Y, Min W, She J et al (2018) An improved equivalent-input-disturbance approach for repetitive control system with state delay and disturbance. IEEE Trans Ind Electron 65(1):521–531
Rangarajan SS, Collins ER, Fox JC (2019) Efficacy of a smart photovoltaic inverter as a virtual detuner for mitigating network harmonic resonance in distribution systems. Electr Power Syst Res 171(02):175–184
Reyes M, Rodriguez P, Vazquez S et al (2012) Enhanced decoupled double synchronous reference frame current controller for unbalanced grid voltage conditions. IEEE Trans Power Electron 27(09):3934–3943
Valencia F, Palma-Behnke R, Ortiz-Villalba D (2017) Special protection systems: challenges in the chilean market in the face of the massive integration of solar energy. IEEE Trans Power Deliv 32(1):575–577
Wenbo S, Xiaorong X, Chicheng C et al (2015) Distributed optimal energy management in microgrids. IEEE Trans Smart Grid 6(3):1137–1146
Xu J, Xie S, Tang T (2014) Improved control strategy with grid-voltage feedforward for LCL-filter-based inverter connected to weak grid. Iet Power Electron 7(10):2660–2671
Yazdi F, Hosseinian SH (2019) A novel “Smart Branch” for power quality improvement in microgrids. Int J Electr Power Energy Syst 110(02):161–170
Yilmaz M, Kayabasi E, Akbaba M (2019) Determination of the effects of operating conditions on the output power of the inverter and the power quality using an artificial neural network. Eng Sci Technol Int J 21(02):1–9
Zhang J, Cheng YH, Yin C et al (2015) Grid-connected photovoltaic system using compound current control of the novel repetitive and PI. In: IEEE international conference on applied super conductivity and electro-magnetic devices, pp 563–564
Zheng Z, Rongxian Z, Shengqing T et al (2013) An overview on advanced grid-connected inverters used for decentralized renewable energy resources. Proc CSEE 33(24):1–2
Funding
The funding was provided by National Key R&D Program of China (Grant No. 2018YFB0606005), Hunan Natural Science Foundation (Grant No. 2017JJ4024) and Hunan Engineering Research Center (Grant No. 2018995).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare that they have no conflict of interest.
Additional information
Communicated by V. Loia.
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Li, S., Chen, W., Fang, B. et al. A strategy of PI + repetitive control for LCL-type photovoltaic inverters. Soft Comput 24, 15693–15699 (2020). https://doi.org/10.1007/s00500-020-04898-5
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00500-020-04898-5