Improved Capacitor Voltage Balancing Algorithm for a Single-phase T-type Inverter
Main Article Content
Abstract
The paper proposes an improved pulse width modulation algorithm to solve the voltage imbalance on DC capacitors for single-phase T-type inverter. By changing the modulation index, the residual states can be applied to the discharge/charge state on the DC capacitors to balance the voltage. The proposed algorithm is validated for application in single-phase T-type inverters in independent mode. The simulation and experimental results have confirmed the effectiveness of the improved pulse width modulation method for single-phase T-type inverter.
Keywords
T-type inverter, balance capacitor voltages, pulse width modulation (PWM)
Article Details
References
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[2] R. Teodorescu, M. Liserre, P, Rodriguez, Grid Converter for Photovoltaic and Wind Power Systems, John Wiley & Sons, 2011.
[3] M. F. Kangarlu and E. Babaei, A Generalized Cascaded Multilevel Inverter Using Series Connection of Submultilevel Inverters, in IEEE Transactions on Power Electronics, vol. 28, no. 2, pp. 625-636, Feb. 2013, http://doi.org/10.1109/TPEL.2012.2203339.
[4] Al‐Judi, A. and Nowicki, E. (2013), Cascading of diode bypassed transistor‐voltage‐source units in multilevel inverters. IET Power Electronics, 6: 554-560. http://doi.org/10.1049/iet-pel.2011.0499.
[5] M. Ben Smida and F. Ben Ammar, Modeling and DBC-PSC-PWM Control of a Three-Phase Flying-Capacitor Stacked Multilevel Voltage Source Inverter, in IEEE Transactions on Industrial Electronics, vol. 57, no. 7, pp. 2231-2239, July 2010, http://doi.org/10.1109/TIE.2009.2030764.
[6] Y. Ounejjar and K. Al-Haddad, Multiband hysteresis controller of the novel three phase seven-level PUC-NPC converter, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, Vienna, Austria, 2013, pp. 6257-6262, http://doi.org/10.1109/IECON.2013.6700164.
[7] U. Choi, F. Blaabjerg and K. Lee, Reliability Improvement of a T-Type Three-Level Inverter With Fault-Tolerant Control Strategy, in IEEE Transactions on Power Electronics, vol. 30, no. 5, pp. 2660-2673, May 2015, http://doi.org/10.1109/TPEL.2014.2325891.
[8] A. Anthon, Z. Zhang, M. A. E. Andersen, D. G. Holmes, B. McGrath and C. A. Teixeira, The Benefits of SiC mosfets in a T-Type Inverter for Grid-Tie Applications, in IEEE Transactions on Power Electronics, vol. 32, no. 4, pp. 2808-2821, April 2017, http://doi.org/10.1109/TPEL.2016.2582344.
[9] M. Aly, E. M. Ahmed, M. Orabi and M. Shoyama, An enhanced PWM method for loss balancing of five level T-type inverter in PV systems, 2018 IEEE Applied Power Electronics Conference and Exposition (APEC), San Antonio, TX, USA, 2018, pp. 2530-2535, http://doi.org/10.1109/APEC.2018.8341373.
[10] M. Parvez, M. F. M. Elias and N. A. Rahim, Performance analysis of PR current controller for single-phase inverters, 4th IET Clean Energy and Technology Conference (CEAT 2016), Kuala Lumpur, Malaysia, 2016, pp. 1-8, http://doi.org/10.1049/cp.2016.1311.
[11] Simone Buso and Paolo Mattavelli, Digital Control in Power Electronics, Morgan & Claypool, 2006, http://doi.org/10.2200/S00047ED1V01Y200609PEL002