Dual Loop Control of 400 Hz Inverter for Ground Power Units
Subject Areas : electrical and computer engineering
M.
Nouri
1
(University of Tehran)
H.
Iman-Eini
2
(University of Tehran)
Keywords: 400 Hz inverter hybrid digital design dual-loop control digital control,
Abstract :
In this paper dual-loop control method is proposed for control of 400 Hz inverter. Resonant controllers are used in the outer loop to regulate the amplitude of fundamental harmonic and to remove the unwanted harmonics. To avoid phase delay and bandwidth degradation, proportional controller is used as the inner control loop. In this paper, hybrid digital design in discrete- and continuous-time domain is introduced to design the inner and outer control loops. To decouple the control system from the load current disturbances and to improve the dynamic performance, a feed-forward path is added to the dual-loop control structure. To reduce the noise of feed-forward path, a soft-derivative term is introduced which is optimized for 400 Hz frequency. To verify the system performance, several simulations have been carried out which shows satisfactory results under dynamic and steady state conditions. Finally, the experimental results of a 20 kVA hardware prototype is presented to confirm the validity of theoretical and simulation results.
[1] L. Mihalache, "DSP control of 400 Hz inverters for aircraft applications," in Proc. IEEE Industry Applications Conf., vol. 3, pp. 1564-1571, Pittsburgh, PA, USA, 13-18 Oct. 2002.
[2] H. Deng, R. Oruganti, and D. Srinivasan, "Modeling and control of single-phase UPS inverters: A survey," in Proc. Int. Conf. on Power Electronics and Drive Systems, vol. 2, pp. 848-853, Kuala Lumper, Malaysia, 28 Oct.-1Nov. 2005.
[3] T. Kawabata and T. Miyashita, "Deadbeat control of three phase PWM inverter," IEEE Trans. on Power Electronics, vol. 5, no. 1, pp. 21-28, Jan. 1990.
[4] Y. Tzou, S. Jung, and H. Yeh, "Adaptive repetitive control of PWM inverters for very low THD AC-voltage regulation with unknown loads," IEEE Trans. on Power Electronics, vol. 14, no. 5, pp. 973-981, Sep. 1999.
[5] S. Buso, S. Fasolo, and P. Mattavelli, "Uninterruptible power supply multiloop control employing digital predictive voltage and current regulators," IEEE Trans. on Industry Applications, vol. 37, no. 6, pp. 1846-1854, Nov./Dec. 2001.
[6] W. Shu-Hui, J. Wen-Yao, J. Zhong-Lu, and P. Li, "Study on dual-loop control for inverters based on state observer with repetitive compensation," in Proc. IEEE 6th Int. Power Electronics and Motion Control Conf., IPEMC'09, pp. 1550-1553, 17-20 May 2009.
[7] X. Ma, H. Wu, S. Sun, and C. Huang, "Control method with digital PI dual close-loop for inverter," in Proc. Int. Conf. on Electrical Machines and Systems, ICEMS'07, pp. 102-105, Seoul, South Korea, 8-11 Oct. 2007.
[8] L. Zhou, X. Jian, K. Zhang, and P. Shi, "Improved dual-loop control plus repetitive control for PWM inverters," in Proc. IEEE Conf. on Industrial Electronics and Applications, 5 pp., 24-26 May 2006.
[9] A. V. Jouanne, P. Enjeti, and D. Lucas, "DSP control of high power UPS systems feeding nonlinear loads," IEEE Trans. on Industrial Electronics, vol. 43, no. 1, pp. 121-125, Feb. 1996.
[10] A. Rahmati, A. Abrishamifar, and M. Arasteh, "Size reduction of UPS output filter by optimal PWM," in Proc. Universities Power Engineering Conf., vol. 2, pp. 623-627, Sep. 2006.
[11] H. Kim and S. Sul, "Analysis on output LC filters for PWM inverters," in Proc. IEEE 6th Int. Power Electronics and Motion Control Conf., IPEMC'09, pp. 384-389, 17-20 May 2009.
[12] P. Loh, M. J. Newman, D. N. Zmood, and D. G. Holmes, "A comparative analysis of multiloop voltage regulation strategies for single and three-phase UPS systems," IEEE Trans. on Power Electronics, vol. 18, no. 5, pp. 1176-1185, Sep. 2003.
[13] K. Kim, N. Park, and D. Hyun, "Advanced synchronous reference frame controller for three-phase UPS powering unbalanced and nonlinear loads," in Proc. IEEE 36th Power Electronics Specialists Conf., PESC '05, pp. 1699-1704, 16-16 Jun. 2005.
[14] L. Mihalache, "Improved load disturbance rejection method for 400 Hz GPU inverters," in Proc. 19th Annual IEEE Applied Power Electronics Conf. and Exposition, APEC '04, vol. 1, pp. 95-101, 22-26 Feb. 2004.
[15] G. L. Basile, et al., "A 400 Hz, 100 kVA, digitally controlled UPS for airport installations," in Proc. IEEE Industry Applications Conf., vol. 4, pp. 2261-2268, Rome, Italy, 8-12 Oct. 2000.
[16] Z. Li, et al., "Single-loop digital control of high-power 400 Hz ground power unit for airplanes," IEEE Trans. on Industrial Electronics, vol. 57, no. 2, pp. 532-543, Feb. 2010.
[17] A. G. Yepes, et al., "Effects of discretization methods on the performance of resonant controllers," IEEE Transactions on Power Electronics, vol. 25, no. 7, pp. 1692-1712, Jul. 2010.