In this paper the resiliency improvement of micro inverter is considered. Its life degrades mainly due to failure of DC link capacitor. The inherent 100 Hz ripples from inverter stage causes excess heat in capacitor. Consequently, the electrolyte dries out quickly and its lifespan decreases. The objective of this paper is to mitigate such AC harmonics on DC link capacitor. A compensator or active power decoupling circuit, APD, is designed in PSIM. The APD circuit is a combination of film capacitor, H-bridge and control circuit. Second frequency AC ripples are converted into DC by actively controlling the capacitor. In this manner AC harmonics are mitigated at the DC link capacitor. Firstly, a benchmark micro inverter is designed and simulated without using APD circuit. Secondly, active power decoupling is used by designing APD circuit. The simulation results show that there is a decrease in AC ripples from 9.4% to 3.2% by using series voltage compensator as compared to passive power decoupling i.e. only a bulk capacitor. The capacitor life is increased up to 19 years and hence of micro-inverter. The total harmonics distortion (THD) analysis shows that by using active power decoupling, system injects 2.7% THD as compared to passive decoupling which is 1.69%. which is still in bellow the IEEE standard of allowable 5% THD.
Siraj ud Din Reliability Improvement of Micro-Inverter through AC-Ripples Voltage Compensator International Journal of Engineering Works Vol. 7 Issue 08 PP. 274-281 August 2020 https://doi.org/10.34259/ijew.20.708274281
Arráez-Cancelliere, Oswaldo A., Nicolás Muñoz-Galeano, and Jesús M. Lopez-Lezama. "Performance and economical comparison between micro-inverter and string inverter in a 5, 1 kWp residential PV-system in Colombia." In 2017 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA), pp. 1-5. IEEE, 2017.
Harb, Souhib, et al. "Micro inverter and string inverter grid-connected photovoltaic system—A comprehensive study." 2013 IEEE 39th Photovoltaic Specialists Conference (PVSC). IEEE, 2013.
“Examples for failures in power electronics system”, European Center for Power Electronics (ECPE), tutorial, April, 2007
S. B. Kjaer, J. K. Pedersen, and F. Blaabjerg, "A Review of Single-phase Gridconnected Inverters for Photovoltaic Modules," IEEE Transactions on Industry Applications, vol. 41, pp. 1292-1306, 2005.
Williams, David. Active power decoupling for a boost power factor correction circuit. Diss. University of British Columbia, 2016.
Hu, H., Harb, S., Kutkut, N., Batarseh, I., & Shen, Z. J. (2012). A review of power decoupling techniques for microinverters with three different decoupling capacitor locations in PV systems. IEEE Transactions on Power Electronics, 28(6), 2711-2726.
Sun, Yao, Yonglu Liu, Mei Su, Xin Li, and Jian Yang. "Active power decoupling method for single-phase current-source rectifier with no additional active switches." IEEE Transactions on Power Electronics 31, no. 8 (2015): 5644-5654.
K.-H. Chao, P.-T. Cheng and T. Shimizu, "New Control Methods for Single Phase PWM Regenerative Rectifier with Power Decoupling Functions," in International Conference on Power Electronics and Drive Systems, Taipei, Taiwan, 2009.
B. Tian, S. Harb and R. Balog, "Ripple-port integrated PFC rectifier with fast dynamic response," in IEEE 57th International Midwest Symposium on Circuits and Systems, College Station, Tx, 2014.
M. Saito and N. Matsui, "Modeling and Control Strategy for a Single-Phase PWM Rectifier Using a Single-Phase Instantaneous active/reactive Power Theory," in Telecommunications
C. Wang, Y. Zou, Y. Zhang and Y. Xu, "Research on the single-phase PWM rectifier basedon the repetitive control," in IEEE International Conference on Industrial Technology, Chengu, 2008.
h. Wang, H. S.-H. Chung and W. Liu, "Use of a Series Voltage Compensator for Reduction of the DC-Link Capacitance in a Capacitor Supported System," IEEE Transactions on Power Electronics, vol. 29, no. 3, pp. 1163-1175, 2014.
Joshi, Mahendra Chandra, and Susovon Samanta. "Modeling and control of bidirectional DC-DC converter fed PMDC motor for electric vehicles." In 2013 Annual IEEE India Conference (INDICON), pp. 1-6. IEEE, 2013.
Hu, Haibing, 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 Transactions on Power Electronics 28, no. 6 (2012): 2711-2726.
Namboodiri, Anuja, and Harshal S. Wani. "Unipolar and bipolar PWM inverter." International Journal for Innovative Research in Science & Technology 1, no. 7 (2014): 237-243.
Azri, Maaspaliza, and Nasrudin Abd Rahim. "Design analysis of low-pass passive filter in single-phase grid-connected transformerless inverter." In 2011 IEEE Conference on Clean Energy and Technology (CET), pp. 348-353. IEEE, 2011.