本文提出了一種考慮不平衡電源之單位功因控制器，用於改善不

平衡電網電壓下三階二極體箝位整流器三相輸入電流的不平衡度。當

電網電壓不平衡時，除了會影響輸入三相電流的不平衡度，還會影響

輸出直流側電壓的漣波量，降低系統穩定度。所提方法將信號延遲法

應用於單位功因控制器，從不平衡的電網電壓信號中分離出所需的正

序電壓分量作為參考信號。本文也分析在電網不平衡下的輸出直流側

電壓，發現直流測電壓漣波的頻率和相位在電網電壓不平衡的情況下

有顯著影響。分析結果可供未來透過輸出直流側電壓的波形特徵即可

判斷出不平衡條件，改善輸入三相電流的不平衡度。

本論文為驗證所提出改善電網電壓不平衡下三相電流不平衡度

之方法，使用 MATLAB 的模擬系統來評估所提出的轉換器的性能。

並建立一套採用數位信號處理器 TMS320F28069，輸出功率 2 千瓦，

750 伏特額定值的實驗測試台，最後由仿真及實驗結果互相驗證系統，

證明該方法的可行性。

This thesis proposed a modified unity power factor controller to
improve the line current unbalance factor for a three-level Neutral Point
Clamped (NPC) rectifier under unbalanced grid source. The delay signal
cancellation phase-sequence separation method is adapted to the unity
power factor controller to obtain the desired positive-sequence component
from the unbalanced grid source as the reference signals. This thesis also
investigate the dc bus voltage ripple and finds that the amplitude, frequency,
and phase are significantly affected by the unbalanced grid source. The
relationship between the ripple and the unbalanced conditions could be
used for compensation and improving the ac line current conditions.
A MATLAB-based simulation system was built to evaluate the
performance of the proposed converter. An experimental test bench, which
employs a digital signal processor (TMS320F28069), with 750VDC/ 2k W
rating was established for measurement. Finally, both simulation and
experimental results demonstrate the validity of the proposed scheme.

[1] A. Nabae, I. Takahashi and H. Akagi, "A New Neutral-Point-Clamped PWM
Inverter," in IEEE Transactions on Industry Applications, vol. IA-17, no. 5, pp.
518-523, Sept. 1981.
[2] M. Malinowski, K. Gopakumar, J. Rodriguez and M. A. Perez, "A Survey on
Cascaded Multilevel Inverters," in IEEE Transactions on Industrial Electronics,
vol. 57, no. 7, pp. 2197-2206, July 2010.
[3] S. Kouro et al., "Recent Advances and Industrial Applications of Multilevel
Converters," in IEEE Transactions on Industrial Electronics, vol. 57, no. 8, pp.
2553-2580, Aug. 2010.
[4] H. Abu-Rub, J. Holtz, J. Rodriguez and G. Baoming, "Medium-Voltage Multilevel
Converters—State of the Art, Challenges, and Requirements in Industrial
Applications," in IEEE Transactions on Industrial Electronics, vol. 57, no. 8, pp.
2581-2596, Aug. 2010.
[5] T. S. Lee, "Lagrangian modeling and passivity-based control of three-phase
AC/DC voltage-source converters", IEEE Trans. Ind. Electron., vol. 51, no. 4, pp.
892-902, Nov. 2004.
[6] Z. Zhang, "Lyapunov-based control for single-phase three-level NPC AC/DC
voltage-source converters", ICEMS., vol. 15, pp. 501-505, Sept. 2009.
[7] J. W. Kolar, T. Friedli, "The essence of three-level PFC rectifier systems - Part
I", IEEE Trans. Power Electron., vol. 28, no. 1, pp. 176-198, Jan. 2013.
[8] T. Friedli, M. Hartmann, J. W. Kolar, "The essence of three-phase PFC rectifier
systems - Part II", IEEE Transactions Power Electron., vol. 29, no. 2, pp. 543-560,
Feb. 2014.
[9] Bor-Ren Lin, Yung-Chuan Lee and Tsung-Yu Yang, "Implementation of a three-
phase high-power-factor rectifier with NPC topology," in IEEE Transactions on
Aerospace and Electronic Systems, vol. 40, no. 1, pp. 180-189, Jan 2004.
[10] P. M. Bhagwat and V. R. Stefanovic, "Generalized Structure of a Multilevel PWM
Inverter," in IEEE Transactions on Industry Applications, vol. IA-19, no. 6, pp.
1057-1069, Nov. 1983.

67

[11] J. Rodriguez, Jih-Sheng Lai and Fang Zheng Peng, "Multilevel inverters: a survey
of topologies, controls, and applications," in IEEE Transactions on Industrial
Electronics, vol. 49, no. 4, pp. 724-738, Aug 2002.
[12] B. Singh, S. Gairola, B. N. Singh, A. Chandra and K. Al-Haddad, "Multipulse AC–
DC Converters for Improving Power Quality: A Review," in IEEE Transactions
on Power Electronics, vol. 23, no. 1, pp. 260-281, Jan. 2008.
[13] H. Akagi, "New trends in active filters for power conditioning," in IEEE
Transactions on Industry Applications, vol. 32, no. 6, pp. 1312-1322, Nov/Dec
1996.
[14] M. El-Habrouk, M. K. Darwish and P. Mehta, "Active power filters: a review,"
in IEE Proceedings - Electric Power Applications, vol. 147, no. 5, pp. 403-413,
Sep 2000.
[15] M. El-Habrouk, M. K. Darwish and P. Mehta, "Active power filters: a review,"
in IEE Proceedings - Electric Power Applications, vol. 147, no. 5, pp. 403-413,
Sep 2000.
[16] L. Chengwu and B. Dong, "Research on AFE Technology in Multi -inverter
System," 2013 Fifth International Conference on Measuring Technology and
Mechatronics Automation, Hong Kong, 2013, pp. 875-878.
[17] L. Yacoubi, K. Al-Haddad, F. Fnaiech and L. A. Dessaint, "A DSP-based
implementation of a new nonlinear control for a three-phase neutral point clamped
boost rectifier prototype," in IEEE Transactions on Industrial Electronics, vol. 52,
no. 1, pp. 197-205, Feb. 2005.
[18] H. S. Kim, J. W. Baek, J. Cho, J. Kim and J. Kim, "Output voltage balancing
methods of 3-level NPC rectifier for low voltage DC distribution," 2015 9th
International Conference on Power Electronics and ECCE Asia (ICPE-ECCE
Asia), Seoul, 2015, pp. 2539-2544.
[19] Zhou Jinghua, Meng Yongqing, Li Zhengxi and Liu Kun, "Research on control
method of three-level NPC voltage source rectifier," 2008 IEEE Vehicle Power
and Propulsion Conference, Harbin, 2008, pp. 1-6.
[20] J. Rodriguez, S. Bernet, P. K. Steimer and I. E. Lizama, "A Survey on Neutral -
Point-Clamped Inverters," IEEE Transactions on Industrial Electronics, vol. 57,
no. 7, pp. 2219-2230, July 2010.

68

[21] Zhang Yingchao, Zhao Zhengming, Mohamed Eltawil and Yuan Liqiang,
"Performance evaluation of three control strategies for three -level neutral point
clamped PWM rectifier," 2008 Twenty-Third Annual IEEE Applied Power
Electronics Conference and Exposition, Austin, TX, 2008, pp. 259-264.
[22] L. Yacoubi, K. Al-Haddad, L. A. Dessaint and F. Fnaiech, "DSP based
implementation of an input/output feedback linearization control technique
applied to a three-phase three-level neutral point clamped boost
rectifier," Industrial Electronics Society, 2003. IECON '03. The 29th Annual
Conference of the IEEE, 2003, pp. 1197-1202 Vol.2.
[23] Zhan Changjiang, Han Yu, Xie Ting, Zhao Zhengyi, Wong Manchung and Han
Yinduo, "Mathematical model and dual-DSP control of tri-level PWM reversible
rectifier," Power Electronics and Drive Systems, 1999.
[24] Yingjie He, Jinjun Liu, Jian Tang, Zhaoan Wang and Yunping Zou, "Research on
control system of DC voltage for active power filters with three-level NPC
inverter," 2008 Twenty-Third Annual IEEE Applied Power Electronics Conference
and Exposition, Austin, TX, 2008, pp. 1173-1178.
[25] M. YongQing, L. Zheng, S. C. Wen, L. Yi, S. YanMin and Y. Ting, "Study on
Mathematical Model and Lyapunov-Based Control for Three-Level NPC Voltage -
Source Rectifier," 2006 IEEE International Symposium on Industrial Electronics,
Montreal, Que., 2006, pp. 1949-1954.
[26] J. Pou, D. Boroyevich and R. Pindado, "New feedforward space-vector PWM
method to obtain balanced AC output voltages in a three-level neutral-point-
clamped converter," in IEEE Transactions on Industrial Electronics, vol. 49, no.
5, pp. 1026-1034, Oct 2002.
[27] S. P. Singh and R. K. Tripathi, "Performance comparison of SPWM and SVPWM
technique in NPC bidirectional converter," 2013 Students Conference on
Engineering and Systems (SCES), Allahabad, 2013, pp. 1-6.
[28] J. Li, A. Q. Huang, Z. Qian and H. Zhao, "A Novel Carrier -based PWM Method
for 3-Level NPC Inverter Utilizing Control Freedom Degree," 2007 IEEE Power
Electronics Specialists Conference, Orlando, FL, 2007, pp. 1899-1904.

69

[29] O. Ojo and S. Konduru, "A Discontinuous Carrier-based PWM Modulation
Method for the Control of the Neutral Point Voltage of Three-Phase Three-Level
Diode Clamped Converters," 2005 IEEE 36th Power Electronics Specialists
Conference, Recife, 2005, pp. 1652-1658.
[30] L. Ning, W. Yue, J. Yingwei and W. Zhaoan, "A fast algorithm for three -level
SVPWM in NPC inverters based on traditional three-level SPWM," The 2nd
International Symposium on Power Electronics for Distributed Generation
Systems, Hefei, China, 2010, pp. 53-57.
[31] I. Sanz, E. J. Bueno, F. J. Rodríguez, M. Moranchel and J. Mingo, "Selective
harmonic elimination for a NPC converter using modified carrier signals," IECON
2014 - 40th Annual Conference of the IEEE Industrial Electronics Society, Dallas,
TX, 2014, pp. 1766-1771.
[32] Franquelo, L.G.; Napoles, J.; Guisado, R.C.P.; Leon, J.I.; Aguirre, M.A., "A
Flexible Selective Harmonic Mitigation Technique to Meet Grid Codes in Thre e-
Level PWM Converters," IEEE Transactions on Industrial Electronics, vol.54,
no.6, pp.3022-3029, Dec. 2007.
[33] Liu Jian, Yin Xianggen, Zhang Zhe and Xiong Qing, "A new three-level NPC
inverter based on phase individual DC-link circuit and high quality digital SPWM
control technology," 2009 International Conference on Communications, Circuits
and Systems, Milpitas, CA, 2009, pp. 732-736.
[34] 張珍珍，「基於載波的三電平逆變器中點電位控制技術的研究」，碩士學位論
文，太原理工大學，2015

[35] S. Ogasawara and H. Akagi, "Analysis of variation of neutral point potential in
neutral-point-clamped voltage source PWM inverters," Conference Record of the
1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting,
Toronto, Ont., 1993, pp. 965-970 vol.2.
[36] H. Akagi and T. Hatada, "Voltage Balancing Control for a Three-Level Diode-
Clamped Converter in a Medium-Voltage Transformerless Hybrid Active Filter,"
in IEEE Transactions on Power Electronics, vol. 24, no. 3, pp. 571-579, March
2009.

70

[37] P. Chaturvedi, A. Ojha, S. Jain and A. Mittal, "Unity power factor controller for
neutral point clamped active front end converter with DC voltage balancing," 2016
IEEE International Conference on Industrial Technology (ICIT) , Taipei, 2016, pp.
384-389.
[38] A. H. Bhat and P. Agarwal, "An Improved Performance Three-Phase Neutral-Point
Clamped Rectifier with Simplified Control Scheme," 2006 IEEE International
Symposium on Industrial Electronics, Montreal, Que., 2006, pp. 1019-1024.
[39] S. Madishetti, B. Singh and G. Bhuvaneswari, "Three-Level NPC-Inverter-Based
SVM-VCIMD With Feedforward Active PFC Rectifier for Enhanced AC Mains
Power Quality," in IEEE Transactions on Industry Applications, vol. 52, no. 2, pp.
1865-1873, March-April 2016.
[40] N. Celanovic, I. Celanovic and D. Boroyevich, "The feedforward method of
controlling three-level diode clamped converters with small DC-link
capacitors," 2001 IEEE 32nd Annual Power Electronics Specialists Conference
(IEEE Cat. No.01CH37230), Vancouver, BC, 2001, pp. 1357-1362 vol. 3.
[41] P. Rioual, H. Pouliquen and J. P. Louis, "Regulation of a PWM rec tifier in the
unbalanced network state using a generalized model," in IEEE Transactions on
Power Electronics, vol. 11, no. 3, pp. 495-502, May 1996.
[42] 何鳴明，「不對稱電網故障下 PWM 整流器的控制策略的研究」，碩士學位論
文，浙江大學，2006
[43] 劉永生，「電網電壓不平衡時 PWM 整流器控制策略研究」，碩士學位論文，
西南交通大學，2008

[44] J. Svensson, M. Bongiorno and A. Sannino, "Practical Implementation of Delayed
Signal Cancellation Method for Phase-Sequence Separation," in IEEE
Transactions on Power Delivery, vol. 22, no. 1, pp. 18-26, Jan. 2007.
[45] T.N. Le, “Kompensation schnell veranderlicher Blindstrome eines
Drehstromverbrauchers,” (in German) EtzArchiv, vol. Bd. 11, no. H. 8, pp. 249–
253, 1989.000
[46] 劉士傑，「以有限元素法探討電力系統三相電壓不平衡之成因及其對感應電
動機之影響」，碩士學位論文，國立雲林科技大學，2001

[47] Electromagnetic compatibility (EMC) Part 4-30:Testing and measurement
techniques, International Electrotechnical Commission Std.

71

[48] Motors and Generators, NEMA Standar MG1-1993, NEMA Std.
[49] IEEE Recommended Practice for Electric Power Distribution for Industrial
Plants," in IEEE Std 141-1993 , vol., no., pp.1-768, April 29 1994
[50] A. D. Rodriguez, F. M. Fuentes and A. J. Matta, "Comparative analysis between
voltage unbalance definitions," 2015 Workshop on Engineering Applications -
International Congress on Engineering (WEA), Bogota, 2015, pp. 1-7.
[51] A. K. Singh, G. K. Singh and R. Mitra, "Some Observations on Definitions of
Voltage Unbalance," 2007 39th North American Power Symposium, Las Cruces,
NM, 2007, pp. 473-479.