Browse > Article

Neutral Point Voltage Control for Grid-Connected Three-Phase Three-Level Photovoltaic Inverter  

Park, Woonho (Semiconductor Engineering of Cheong-ju University)
Yang, Oh (Semiconductor Engineering of Cheong-ju University)
Publication Information
Journal of the Semiconductor & Display Technology / v.14, no.4, 2015 , pp. 72-77 More about this Journal
Abstract
Three-level diode clamped multilevel inverter, generally known as neutral point clamped (NPC) inverter, has an inherent problem causing neutral point (NP) potential variation. Until now, the NP potential problem of variation has been investigated and lots of solutions have also been proposed. This paper presents a neutral point voltage control technology using the anti-windup PI controller and offset technology of PWM (Pulse Width Modulation) to control the variation of NPC 3-phase three-level inverter neutral point voltage. And the proposed algorithm is tested and verified using a PLL (Phase Locked Loop) in order to synchronize the phase voltage from the line voltage of grid. It significantly improves the voltage balancing under a solar fluctuation conditions of the inverter. Experimental results show the good performance and effectiveness of the proposed method.
Keywords
Neutral point clamped inverter; three-level; Phase Locked Loop; anti-windup PI controller; photovoltaic power system;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 J.P. Lyons, V. Vlatkovic, "Power electronics and alternative energy generation," Proceedings of PESC 04, pp. 16-21, (2004).
2 R. M. Tallam, R. Naik, T. A. Nondahl, "A carrierbased PWM scheme for neutral-point voltage balancing in three-level inverters," IEEE Trans. Industry Applications, 41(6), pp. 1734-1743, (2005).   DOI
3 Minho Kwon, Jooha Kim, Sewan Choi, "Neutralpoint voltage balancing control method of carrierbased PWM scheme for Bi-directional three-level inverter," Power Electronics Annual Conference, pp. 211-212, (2014).
4 Kwanghee lee, Seungyong Jang, Jaeho Choi, "The comparative analysis of power losses for 3-level NPC inverter and 3-level T-type inverter module used in 10 kW photovoltaic system," Power Electronics Annual Conference, pp. 143-144, (2014).
5 Jong-Je Park, Byoung-Gun Park, Dong-Hyun Ha, Dong-Seok Hyun, "A study on the neutral point potential variation under open-circuit fault of threelevel NPC inverter," The Transactions of Korean Institute of Power Electronics, 14(4). pp. 333-342, (2009).
6 J. S. Lai, F. Z. Peng, "Multilevel converters-A new breed of power converters," IEEE Trans. Ind. Appl., 32(3), pp. 509-517, (1996).   DOI
7 Jianguo Lyu, Wenbin Hu, Fuyun Wu, Kai Yao, Junji Wu, "Variable modulation offset SPWM control to balance the neutral-point voltage for three-level inverters," IEEE Trans. on Power Electronics, 30(12), pp. 7181-7192, (2015).   DOI
8 Yoon Hyuk Ko, Kui-Jun Lee, Rae-Young Kim, Dong-Seok Hyun, "Predictive control of the neutral point voltage in the three-level NPC inverter,"Power Electronics Annual Conference, The Korean Institute of Power Electronics, pp. 356-357, (2011).
9 Jun-Keun Ji, Hyo-sung Kim, Seung-Ki Sul, Kyung- Hwan Kim, "PLL strategy having frequency limiter and anti-windup suitable to UPS," Power Electronics Annual Conference, The Korean Institute of Power Electronics, pp.778-782, (2004).
10 Min Ho Kim, Oh Yang, "Sensor less speed control of PMSM using stator flux estimation and PLL," Journal of Semiconductor and Display Technology, 14(2), pp. 35-40, (2015).
11 Jinsoo Kim, Oh Yang, "A study on the MPPT control method for grid-connected multi-string three-phase three-level PV inverter," Journal of Semiconductor Display Technology, 13(4), pp. 43-48, (2014).