Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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New Control Method for Power Decoupling of Electrolytic Capacitor-less Photovoltaic Micro-Inverter with Primary Side Regulation

  • Received : 2017.01.16
  • Accepted : 2017.07.17
  • Published : 2018.03.01
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Abstract

This paper presents a novel power decoupling control scheme with the bidirectional buck-boost converter for primary-side regulation photovoltaic (PV) micro-inverter. With the proposed power decoupling control scheme, small-capacitance film capacitors are used to overcome the life-span and reliability limitations of the large-capacitance electrolytic capacitors. Then, an improved flyback PV inverter is employed in continuous conduction mode with primary-side regulation for the PV power conditioning. The proposed power-decoupling controller shares the reference for primary side current regulation of the flyback PV inverter. The decoupling controller shapes the input current of the bidirectional buck-boost converter. The shared reference eliminates the phase-delay between the input current to the bidirectional buck-boost converter and the double frequency current at the PV primary current. The elimination of the phase-delay in dynamic response enhances the ripple rejection capability of the power decoupling buck-boost converter even with small film capacitor. With proposed power decoupling control scheme, the additional advantage of the primary-side regulation of flyback PV inverter is that there is no need to have an extra current sensor for obtaining the ripplecurrent reference of the decoupling current-controller of the power-decoupling buck-boost converter. Therefore, the proposed power decoupling control scheme is cost-effective as well as the size benefit. A new transient analysis is carried out which includes the source voltage dynamics instead of considering the source voltage as a pure voltage source. For verification of the proposed control scheme, simulation and experimental results are presented.

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References

  1. M. S. Irfan, A. Ahmed; J. H. Park, "Current-Sensorless Power-Decoupling Phase-Shift Dual-Half-Bridge Converter for DC-AC Power Conversion Systems without Electrolytic Capacitor," in IEEE Trans on Power Electron, vol. 32, no. 5, pp. 3610-3622, May 2017. https://doi.org/10.1109/TPEL.2016.2587813
  2. Haibing Hu, Souhib Harb, Nasser Kutkut, Issa Batarseh and Z. John Shen, "A Review of Power Decoupling Techniques for Microinverters With Three Different Decoupling Capacitor Locations in PV Systems," IEEE Trans. on Power Electron, vol. 28, no. 6, pp. 2711-2726, June 2013. https://doi.org/10.1109/TPEL.2012.2221482
  3. Fanghua Zhang, Jianjun Ni, and Yijie Yu, "High Power Factor AC-DC LED Driver with Film Capacitors," IEEE Trans. on Power Electron, vol. 28, no. 10, pp. 4831-4840, October 2013. https://doi.org/10.1109/TPEL.2012.2233498
  4. Juan M. Galvez and Martin Ordonez, "Swinging Bus Operation of Inverters for Fuel Cell Applications With Small DC-Link Capacitance," IEEE Trans. on Power Electron, vol. 30, no. 2, pp. 1064-1075, February 2015. https://doi.org/10.1109/TPEL.2014.2310731
  5. Shu Wang, Xinbo Ruan, Kai Yao, Siew-Chong Tan, Yang Yang, and Zhihong Ye, "A Flicker-Free Electrolytic Capacitor-Less AC-DC LED Driver," IEEE Trans on Power Electron, vol. 27, no. 11, pp. 4540-4548, November 2012. https://doi.org/10.1109/TPEL.2011.2180026
  6. Yan Zhou, Hongbo Li, and Hui Li, "A Single-Phase PV Quasi-Z-Source Inverter With Reduced Capacitance Using Modified Modulation and Double-Frequency Ripple Suppression Control," IEEE Trans. on Power Electron, vol. 31, no. 3, pp. 2166-2173, March 2016. https://doi.org/10.1109/TPEL.2015.2432070
  7. Yanlin Li and Ramesh Oruganti, "A Low Cost Flyback CCM Inverter for AC Module Application," IEEE Trans. on Power Electron, vol. 27, no. 3, pp. 1295-1303, March 2012. https://doi.org/10.1109/TPEL.2011.2164941
  8. Yong-Su Noh, Bong-Yeon Choi, Soon-Ryung Lee, Ju-Kyoung Eom, and Chung-Yuen Won, "An Optimal Method to Design a Trap-CL Filter for a PV ACModule Based on Flyback Inverter," IEEE Trans. on Ind. Appl., vol. 52, no. 2, pp. 1632-1641, March/April 2016. https://doi.org/10.1109/TIA.2015.2501763
  9. Sung-Ho Lee, Woo-Jun Cha, Bong-Hwan Kwon, and Minsung Kim, "Discrete-Time Repetitive Control of Flyback CCM Inverter for PV Power Applications," IEEE Trans. on Ind. Electron., vol. 63, no. 2, pp. 976-984, February 2016. https://doi.org/10.1109/TIE.2015.2477484
  10. T. V. Thang, N. M. Thao, Jong-Ho Jang, and Joung-Hu Park, "Analysis and Design of Grid-Connected Photovoltaic Systems With Multiple-Integrated Converters and a Pseudo-DC-Link Inverter," IEEE Trans. on Ind. Electron. vol. 61, no. 7, pp. 3377-3386, July 2014. https://doi.org/10.1109/TIE.2013.2281153
  11. Dong-Jo Won, Yong-Su Noh, Hong-Woo Lim, and Chung-Yuen Won, "A Study on PV AC-Module with Active Power Decoupling and Energy Storage System," Journal of Power Electronics, vol. 16, no. 15, pp. 1-10, Sep. 2016. https://doi.org/10.6113/JPE.2016.16.1.1
  12. Jong-Hyun Shin, Joung-Hu Park, "Controller design of bidirectional buck-boost converter for power decoupling of photovoltaic microinverter," KIPE autumn conference, pp. 13-14, Nov. 2014.
  13. Chuan Yao, Xinbo Ruan, Weijie Cao, and Peilin Chen, "A Two-Mode Control Scheme With Input Voltage Feed-Forward for the Two-Switch Buck-Boost DC-DC Converter," IEEE Trans. Power Electron., vol. 29, no. 4, pp. 2037-2048, April 2014. https://doi.org/10.1109/TPEL.2013.2270014