CONTROL STRATEGY FOR VOLTAGE REDUCTION IN SINGLE-PHASE TWO-STAGE PHOTOVOLTAIC INVERTER
DOI:
https://doi.org/10.59627/cbens.2022.1068Keywords:
Photovoltaic Systems, Inverter, ControlAbstract
Single-phase photovoltaic inverters have been widely used in systems with rated power lower than 10 kW. Among the various topologies available, those based on full-bridge inverters are present in several commercial inverters. It is well known that photovoltaic inverters have a second harmonic ripple at the dc link voltage. This component appears because of the instantaneous power is not constant in single-phase systems. The voltage ripple can affect the terminal voltage of the photovoltaic array, thus reducing the efficiency of the maximum power point tracking, even in inverters with two conversion stages (with dc/dc converter). This work proposes a simplified control technique to reduce the ripple in the terminals of the photovoltaic array in two-stage PV inverters. The technique is based on a real-time normalization of the dc/dc converter control signal and do not require any additional measurement. Performance is evaluated using simulations. The case study is based on a 4.4 kVA/220 V photovoltaic inverter with input for two photovoltaic series. For the case study, the proposed technique leads to improvements in both static and dynamic efficiencies (0.74% and 0.87% respectively).
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References
Choi, W. Y., S. G. Song, S. J. Park, K. H. Kim, e Y. C. Lim. “Photovoltaic Module Integrated Converter System Minimizing input ripple current for inverter load.” IEEE INTELEC 2009 - 31st International Telecommunications Energy Conference, 2009.
Ciobotaru, M., R. Teodorescu, e F. Blaabjerg. “A new single-phase PLL structure based on second order generalized integrator.” IEEE Power Electronics Specialists Conference, 2006: 1-6.
de Barros, R.C., R.P. Silva, D.B. da Silveira, W.C. Boaventura, A.F. Cupertino, e H.A. Pereira. “Third Harmonic Injection Method for Reliability Improvement of Single-Phase PV Inverters.” IEEE 15th Brazilian Power Electronics Conference, 2019.
Falck, J., C. Felgemacher, A. Rojko, M. Liserre, e P. Zacharias. “Reliability of Power Electronic Systems: An Industry Perspective.” IEEE Industrial Electronics Magazine, 2018.
Guo, B., et al. “Optimization Design and Control of Single-Stage Single-Phase PV Inverters for MPPT Improvement.” IEEE Transactions on Power Electronics 35 (2020).
Haeberlin, H., e P. Scharerf. “New procedure for measuring dynamic mpp-tracking efficiency at grid-connected pv inverters.” 24th European Photovoltaic Solar Energy Conference, 2009: 21-25.
Jeong, H. G., G. S. Kim, e K. B. Lee. “Second-Order Harmonic Reduction Technique for Photovoltaic Power Conditioning Systems Using a Proportional-Resonant.” Energies ISSN 1996-1073, 2013.
Kan, S., X. Ruan, H. Dang, L. Zhang, e X. Huang. “Second Harmonic Current Reduction in Front-End DC-DC Converter for Two-Stage Single-Phase Photovoltaic Grid-Connected Inverter.” IEEE Transactions on Power Electronics, 2019.
Liu, B., et al. “A modified modulation for single-phase photovoltaic/battery inverter to improve AC power quality with low DC-link capacitance.” International Journal of Electrical Power & Energy Systems, 2019.
Lyden, S., e M. Haque. “Maximum power point tracking techniques for photovoltaic systems: A comprehensive review and comparative analysis.” Renewable and Sustainable Energy Reviews 52, 2015.
Ross, R. G., e M. I. Smokler. “Electricity from photovoltaic solar cells: Flat-plate solar array project: Final report: Volume 6.” Engineering sciences and reliability. JPL Publication, NASA, Springfield, VA., 1986.
Wu, T. F., C. H. Chang, L. C. Lin, e C. L. Kuo. “Power Loss Comparison of Single- and Two-Stage Grid-Connected Photovoltaic Systems.” IEEE Transactions on Energy Conversion, 2011.
Xavier, L. S., A. F. Cupertino, e H. A. Pereira. “Ancillary services provided by photovoltaic inverters: Single and three phase control strategies.” Computers & Electrical Engineering, Volume 70, 2018: 102-121.
Zeng, J., M. Zhuo, H. Cheng, T. Kim, V. Winstead, e L. Wu. “Power pulsation decoupling for a two-stage single-phase photovoltaic inverter with film capacitor.” IEEE Energy Conversion Congress and Exposition (ECCE), 2017.
