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Journal of Zhejiang University SCIENCE C

ISSN 1869-1951(Print), 1869-196x(Online), Monthly

New method for estimating flying capacitor voltages in stacked multicell and flying capacitor multicell converters

Abstract: Multicell converters are an interesting alternative for medium voltage and high power applications, because of the increased number of output voltage levels and apparent frequency. The two most significant types of multicell converter are the flying capacitor multicell (FCM) converter and its derivative, stacked multicell (SM) converter. Balancing flying capacitor voltages is an important constraint to the proper performance of FCM and SM converters. Thus, observation of the flying capacitor voltages used in active control is valuable, but using voltage sensors for observation increases cost and size of the converter. This paper deals with a new strategy to estimate the flying capacitor voltages of both FCM and SM converters. The proposed strategy is based on a discrete time model of the converter and uses only a load current sensor. The circuit was simulated using PSCAD/EMTDC software and simulation results were presented to validate the effectiveness of the proposed estimation strategy in observing the flying capacitor voltages. Simplicity is the most significant advantage of the proposed strategy, its performance being based on simple equations.

Key words: Flying capacitor multicell converter, Stacked multicell converter, Flying capacitor voltage, Phase shifted sinusoidal pulse width modulation


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[1]Babaei, E., Hosseini, S.H., Gharehpetian, G.B., Tarafdar Haque, M., Sabahi, M., 2007. Reduction of dc voltage sources and switches in asymmetrical multilevel converters using a novel topology. J. Electr. Power Syst. Res., 77(8):1073-1085.

[2]Haederli, C., Ladoux, P., Meynard, T., Gateau, G., Lienhardt, A.M., 2006. Neutral Point Control in Multilevel Converters Applying Novel Modulation Schemes. IEEE 37th Power Electronics Specialists Conf., p.1-8.

[3]Halvaei Niasar, A., Vahidi, A., Moghbell, H., 2009. Low-cost sensorless control of four-switch, brushless DC motor drive with direct back-EMF detection. J. Zhejiang Univ. Sci. A, 10(2):201-208.

[4]Hosseini, S.H., Khoshkbar Sadigh, A., Sharifi, A., 2009. Estimation of flying capacitors voltages in multicell converters. 6th Int. Conf. on Electrical Engineering/ Electronics Computer Telecommunications and Information Technology, p.110-113.

[5]Hu, J.B., He, Y.K., 2007. Multi-frequency proportional-resonant (MFPR) current controller for PWM VSC under unbalanced supply conditions. J. Zhejiang Univ. Sci. A, 8(10):1527-1531.

[6]Hu, J.B., He, Y.K., Heng, N., 2007. Enhanced control of DFIG-used back-to-back PWM VSC under unbalanced grid voltage conditions. J. Zhejiang Univ. Sci. A, 8(8):1330-1339.

[7]Khoshkbar Sadigh, A., Babaei, E., Hosseini, S.H., Farasat, M., 2009a. Dynamic Voltage Restorer Based on Stacked Multicell Converter. IEEE Symp. on Industrial Electronics and Application, p.419-424.

[8]Khoshkbar Sadigh, A., Hosseini, S.H., Barakati, S.M., Gharehpetian, G.B., 2009b. Flying Capacitor Multicell Converter Based Dynamic Voltage Restorer. 41st North American Power Symp., p.1-6.

[9]Khoshkbar Sadigh, A., Hosseini, S.H., Barakati, S.M., Gharehpetian, G.B., 2009c. Stacked Multicell Converter Based DVR with Energy Minimized Compensation Strategy. 41st North American Power Symp., p.1-6.

[10]Lezana, P., Silva, C.A., Rodríguez, J., Pérez, M.A., 2007. Zero steady state error input-current controller for regenerative multilevel converters based on single-phase cells. IEEE Trans. Ind. Electron., 54(2):733-740.

[11]Lezana, P., Rodríguez, J., Oyarzún, D.A., 2008a. Cascaded multilevel inverter with regeneration capability and reduced number of switches. IEEE Trans. Ind. Electron., 55(3):1059-1066.

[12]Lezana, P., Ortiz, G., Rodríguez, J., 2008b. Operation of Regenerative Cascade Multicell Converter under Fault Condition. 11th Workshop on Control and Modeling for Power Electronics, p.1-6.

[13]Li, C.H., Zhu, X.J., Cao, G.Y., Hu, W.Q., Sui, S., Hu, M.R., 2009. A maximum power point tracker for photovoltaic energy systems based on fuzzy neural networks. J. Zhejiang Univ. Sci. A, 10(2):263-270.

[14]Lienhardt, A.M., Gateau, G., Meynard, T.A., 2006a. Stacked Multicell Converter: Digital Sliding Mode Observation of Flying Capacitor Voltages. 32nd Annual Conf. on IEEE Industrial Electronics, p.2115-2120.

[15]Lienhardt, A.M., Gateau, G., Meynard, T.A., 2006b. Stacked Multicell Converter: Sliding Mode Observation of Flying Capacitor Voltages. IEEE Int. Symp. on Industrial Electronics, p.970-976.

[16]Lienhardt, A.M., Gateau, G., Meynard, T.A., 2007. Digital sliding-mode observer implementation using FPGA. IEEE Trans. Ind. Electron., 54(4):1865-1875.

[17]Ma, M.Y., He, X.N., 2008. Synchronization analysis on cascaded multilevel converters with distributed control. J. Zhejiang Univ. Sci. A, 9(2):190-198.

[18]McGrath, B.P., Holmes, D.G., 2008. Natural current balancing of multicell current source converters. IEEE Trans. Power Electron., 23(3):1239-1246.

[19]McGrath, B.P., Meynard, T.A., Gateau, G., Holmes, D.G., 2007. Optimal modulation of flying capacitor and stacked multicell converters using a state machine decoder. IEEE Trans. Power Electron., 22(2):508-516.

[20]Meynard, T.A., Fadel, M., Aouda, N., 1997. Modeling of multilevel converters. IEEE Trans. Ind. Electron., 44(3):356-364.

[21]Meynard, T.A., Foch, H., Forest, F., Turpin, C., Richardeau, F., Delmas, L., Gateau, G., Lefeuvre, E., 2002. Multicell converters: derived topologies. IEEE Trans. Ind. Electron., 49(5):978-987.

[22]Meynard, T.A., Lienhardt, A.M., Gateau, G., Haederli, C.H., Barbosa, P., 2006. Flying Capacitor Multicell Converters with Reduced Stored Energy. IEEE Symp. on Industrial Electronics, p.1-5.

[23]Nabae, A., Takahashi, I., Akagi, H., 1981. A new neutral point clamped PWM inverter. IEEE Trans. Ind. Appl., 17(5):518-523.

[24]Ruelland, R., Gateau, G., Meynard, T.A., Hapiot, J.C., 2003. Design of FPGA-based emulator for series multicell converters using co-simulation tools. IEEE Trans. Power Electron., 18(1):455-463.

[25]Sayyah, A., Aflaki, M., Rezazadeh, A., 2008. Optimization of total harmonic current distortion and torque pulsation reduction in high-power induction motors using genetic algorithms. J. Zhejiang Univ. Sci. A, 9(12):1741-1752.

[26]Turpin, C., Deprez, L., Forest, F., Richardeau, F., Meynard, T.A., 2002. A ZVS imbricated cell multilevel inverter with auxiliary resonant commutated poles. IEEE Trans. Power Electron., 17(6):874-882.

Open peer comments: Debate/Discuss/Question/Opinion

<1>

zhaizy

2010-08-02 17:14:21

Reviwer 1: Useful paper in terms of applying state theory to a flying capacitor converter to back calculate the capacitor voltages from the output load conditions. Reviwer 2: A good paper on a timely subject.
--Editor

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DOI:

10.1631/jzus.C0910559

CLC number:

TM464

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Cited:

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On-line Access:

2010-08-02

Received:

2009-09-10

Revision Accepted:

2010-01-05

Crosschecked:

2010-07-01

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