In this research paper design, analysis and comparison of single stage and two stages Photovoltaic inverter connected to weak grid system is executed in terms of their maximum power point tracking, DC link voltage regulation, power factor and overall efficiency. Majority of the commercial and industrial loads are inductive in nature and result in a very low lagging power factor. However renewable energy sources have no reactive power generation and lagging power factor results in a weak grid system. For this purpose control mechanism comprises of three objectives is proposed in this research paper. These objectives are to obtain highest amount of power from photovoltaic array, the power must be deliver from photovoltaic array into the utility grid at unity power factor and to maintain desired voltage at the input of the inverter. In order to achieve these objectives nonlinear control mechanism of Photovoltaic inverter connected to weak grid system is established and implemented based on accurate mathematical modeling and by using Backstepping technique and Lyapunov Stability analysis. PI controller is used for the purpose to maintain desired voltage at input of the inverter according to the requirement of inverter. Both single stage and two stage models are developed and simulated in Simulink/Matlab environment.
Naveed Malik Sami Ullah Amir Khan and Farhan Ullah Designing and Analysis of Single Stage and Two Stage PV Inverter Connected to Weak Grid System International Journal of Engineering Works Vol. 7 Issue 10 PP. 361-368 October 2020 https://doi.org/10.34259/ijew.20.710361369.
D. Poponi, “Analysis of diffusion paths for photovoltaic technology based on experience curves,” Sol. Energy, vol. 74, no. 4, pp. 331–340, Apr. 2003, doi: 10.1016/S0038-092X(03)00151-8.
[2] Fangrui Liu, Yong Kang, Yu Zhang, and Shanxu Duan, “Comparison of P&O and hill climbing MPPT methods for grid-connected PV converter,” in 2008 3rd IEEE Conference on Industrial Electronics and Applications, Singapore, Jun. 2008, pp. 804–807, doi: 10.1109/ICIEA.2008.4582626.
[3] N. Femia, G. Petrone, G. Spagnuolo, and M. Vitelli, “Optimization of Perturb and Observe Maximum Power Point Tracking Method,” IEEE Trans. Power Electron., vol. 20, no. 4, pp. 963–973, Jul. 2005, doi: 10.1109/TPEL.2005.850975.
[4] B. M. T. Ho and H. S.-H. Chung, “An Integrated Inverter With Maximum Power Tracking for Grid-Connected PV Systems,” IEEE Trans. Power Electron., vol. 20, no. 4, pp. 953–962, Jul. 2005, doi: 10.1109/TPEL.2005.850906.
[5] Bo Yang, Wuhua Li, Yi Zhao, and Xiangning He, “Design and Analysis of a Grid-Connected Photovoltaic Power System,” IEEE Trans. Power Electron., vol. 25, no. 4, pp. 992–1000, Apr. 2010, doi: 10.1109/TPEL.2009.2036432.
[6] Yeong-Chau Kuo, Tsorng-Juu Liang, and Jiann-Fuh Chen, “Novel maximum-power-point-tracking controller for photovoltaic energy conversion system,” IEEE Trans. Ind. Electron., vol. 48, no. 3, pp. 594–601, Jun. 2001, doi: 10.1109/41.925586.
[7] A. Koran, K. Sano, and R.-Y. Kim, “Design of a Photovoltaic Simulator with a Novel Reference Signal Generator and Two-Stage LC Output Filter,” p. 8.
[8] D. Casadei, G. Grandi, and C. Rossi, “Single-Phase Single-Stage Photovoltaic Generation System Based on a Ripple Correlation Control Maximum Power Point Tracking,” IEEE Trans. Energy Convers., vol. 21, no. 2, pp. 562–568, Jun. 2006, doi: 10.1109/TEC.2005.853784.
[9] Y. Huang, M. Shen, F. Z. Peng, and J. Wang, “$Z$-Source Inverter for Residential Photovoltaic Systems,” IEEE Trans. Power Electron., vol. 21, no. 6, pp. 1776–1782, Nov. 2006, doi: 10.1109/TPEL.2006.882913.
[10] S. B. Kjaer, J. K. Pedersen, and F. Blaabjerg, “A Review of Single-Phase Grid-Connected Inverters for Photovoltaic Modules,” IEEE Trans. Ind. Appl., vol. 41, no. 5, pp. 1292–1306, Sep. 2005, doi: 10.1109/TIA.2005.853371.
[11] V. Ravindran, S. K. Ronnberg, T. Busatto, and M. H. J. Bollen, “Inspection of interharmonic emissions from a grid-tied PV inverter in North Sweden,” in 2018 18th International Conference on Harmonics and Quality of Power (ICHQP), Ljubljana, May 2018, pp. 1–6, doi: 10.1109/ICHQP.2018.8378887.
[12] B. N. Alajmi, K. H. Ahmed, G. P. Adam, and B. W. Williams, “Single-Phase Single-Stage Transformer less Grid-Connected PV System,” IEEE Trans. Power Electron., vol. 28, no. 6, pp. 2664–2676, Jun. 2013, doi: 10.1109/TPEL.2012.2228280.
[13] L. Chen, A. Amirahmadi, Q. Zhang, N. Kutkut, and I. Batarseh, “Design and Implementation of Three-Phase Two-Stage Grid-Connected Module Integrated Converter,” IEEE Trans. Power Electron., vol. 29, no. 8, pp. 3881–3892, Aug. 2014, doi: 10.1109/TPEL.2013.2294933.
[14] H. Hu, S. Harb, N. H. Kutkut, Z. J. Shen, and I. Batarseh, “A Single-Stage Microinverter Without Using Eletrolytic Capacitors,” IEEE Trans. Power Electron., vol. 28, no. 6, pp. 2677–2687, Jun. 2013, doi: 10.1109/TPEL.2012.2224886.
[15] N. Sukesh, M. Pahlevaninezhad, and P. K. Jain, “Analysis and Implementation of a Single-Stage Flyback PV Microinverter With Soft Switching,” IEEE Trans. Ind. Electron., vol. 61, no. 4, pp. 1819–1833, Apr. 2014, doi: 10.1109/TIE.2013.2263778.
[16] Y.-H. Kim, Y.-H. Ji, J.-G. Kim, Y.-C. Jung, and C.-Y. Won, “A New Control Strategy for Improving Weighted Efficiency in Photovoltaic AC Module-Type Interleaved Flyback Inverters,” IEEE Trans. Power Electron., vol. 28, no. 6, pp. 2688–2699, Jun. 2013, doi: 10.1109/TPEL.2012.2226753.
[17] C. Meza, D. Biel, D. Jeltsema, and J. M. A. Scherpen, “Lyapunov-Based Control Scheme for Single-Phase Grid-Connected PV Central Inverters,” IEEE Trans. Control Syst. Technol., vol. 20, no. 2, pp. 520–529, Mar. 2012, doi: 10.1109/TCST.2011.2114348.
[18] F. Blaabjerg, R. Teodorescu, M. Liserre, and A. V. Timbus, “Overview of Control and Grid Synchronization for Distributed Power Generation Systems,” IEEE Trans. Ind. Electron., vol. 53, no. 5, pp. 1398–1409, Oct. 2006, doi: 10.1109/TIE.2006.881997.
[19] J. He and Y. W. Li, “Generalized Closed-Loop Control Schemes with Embedded Virtual Impedances for Voltage Source Converters with LC or LCL Filters,” IEEE Trans. Power Electron., vol. 27, no. 4, pp. 1850–1861, Apr. 2012, doi: 10.1109/TPEL.2011.2168427.
