JEMAA  Vol.2 No.1 , January 2010
Research on a New Control Strategy of Three Phase Inverter for Unbalanced Loads
Abstract: One of the very important functions of three-phase inverter is to maintain the symmetric three-phase output voltage when the three-phase loads are unbalanced. Although the traditional symmetrical component decomposing and superimpose theory can keep the voltage balance through compensating the positive-, negative- and zero-sequence components of the output voltage of inverter, however, this method is time-consuming and not suitable for control. Aiming at high power medium frequency inverter source, a P+Resonant (Proportion and Resonant) controller which ensured a balanced three phase output voltage under unbalanced load is proposed in this paper. The regulator was proved to be applicable to both three-phase three-wire system and three-phase four-wire system and developed two methods of realization. The simulation results verified that this method can suppressed effectively the output voltage distorted caused by the unbalanced load and attained a high quality voltage waveforms.
Cite this paper: nullW. HU, W. Ma and C. LIU, "Research on a New Control Strategy of Three Phase Inverter for Unbalanced Loads," Journal of Electromagnetic Analysis and Applications, Vol. 2 No. 1, 2010, pp. 39-44. doi: 10.4236/jemaa.2010.21006.

[1]   R. A. Gannett, “Control strategies for high power four-leg voltage source inverters,” Virginia Tech, 2001.

[2]   R. Zhang, “High performance power converter systems for nonlinear and unbalanced load/source,” Virginia Tech, 1998.

[3]   P. Hsu and M. Behnke, “A three-phase synchronous frame controller for unbalanced load,” IEEE-PESC’98 Record, Fukuoka, Japan, Vol. 2, No. 5, pp. 1369–1374, 1998.

[4]   P. Mattavelli, “Synchronous-frame harmonic control for high-performance AC power supplies,” IEEE Transaction on Industry Applications, Vol. 37, No. 3, pp. 864–872, May/June 2001.

[5]   D. N. Zmood and D. G. Holmes, “Stationary frame current regulation of PWM inverters with zero steady state error,” Proceedings of PESC’99, SC, USA, pp. 1185– 1190, 1999.

[6]   C. Sun, W. M. Ma, and J. Y. Lu, “Analysis of the unsymmetrical output voltages distortion mechanism of three-phase inverter and its corrections,” Proceedings of CSEE, Vol. 26, No. 21, pp. 57–64, November 2006.

[7]   Y. Sato, T. Ishizuka, K. Nezu, and T. Kataoka, “A new control strategy for voltage-type PWM rectifiers to realize zero steady-state control error in input current,” IEEE Transactions on Industry Applications. Vol. 34, No.3, pp. 480–486, May/June 1998.