A DEVELOPED MODIFIED OSAP CONTROLLER WITH REPETITIVE CONTROL ACTION FOR UPS
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Abstract
In this work, a developed modified one sampling ahead preview (OSAP) controller with repetitive control action for single – phase voltage source PWM inverters used in (UPS) systems is proposed. The proposed technique minimizes largely the plant modeling errors resulted from simplification made to obtain a linear discrete - time plant model. In addition, due to the repetitive control action, this digital control scheme can minimize the steady-state error and periodic distortions caused by nonlinear cyclic loads. Hence, the Total Harmonic Distortion (THD) will be reduced. This technique utilizes a switching frequency greater than the sampling frequency, yielding additional minimization in the plant modeling errors. As the sampling frequency is less than the switching frequency, it is possible to implement this controller on a low speed microcontroller. Plant model and theoretical analysis of the control scheme are discussed. Simulation results are presented to verify the performance of the proposed approach under different load conditions.
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References
A. Kawamura, R. Chuarayapratip, and T. Haneyoshi, “Deadbeat Control of PWM Inverter with Modified Pulse Patterns for Uninterruptible Pwoer Supply”; lEEE Trans. On lnd. Appl., Vol. 35, No. 2, May 1988, PP. 295 – 300.
K. P. Gokhale, A. Kawamura and R. G. Hoft, “Deadbeat Microprocessor Control of PWM Inverter for Sinusoidal Output Waveform Synthesis”; IEEE Trans. On Ind. Appl., Vol. IA-23, No. 5, September/October 1987, PP. 901 – 910.
A. Kawamura, T. Haneyoshi, and R. G. Hoft, “Deadbeat Controlled PWM Inverter with Parameter Estimation Using Only Voltage Sensor”; IEEE Trans. On Power Electronics, Vol. 3, April 1988, PP. 118 – 125.
T. Haneyoshi, A. Kawamura, and R. G. Hoft, “Waveform Compensation of PWM Inverter with Cyclic Fluctuating Loads”; IEEE Trans. On Ind. Appl., Vol. 24, July/August 1988, PP. 582 – 588.
Y. Nishida and T. Haneyoshi, “Predictive Instantaneous Value Controlled PWM Inverter for UPS”; IEEE Trans. On Power Electronics, Spec. Conf. Rec., PP. 776 – 783, 1992.
Cassiano Rech, H. Pinheiro, H. A. Gründling, H. L. Hey, and J. R. Pinheiro, “Improved Modified OSAP Controller for Voltage Source PWM Inverters”; Proc. Brazilian Power Electronics Conf., PP. 329 – 334, 2001.
Cassiano Rech, H. Pinheiro, H. A. Gründling, H. L. Hey, and J. R. Pinheiro, “Comparison of digital control techniques with repetitive integral action for low cost PWM inverters”; IEEE Trans. On Power Electronics, Vol. 18, No. 1, January 2003,
PP. 401 – 410.