The 9th International Symposium on ADVANCED TOPICS IN ELECTRICAL ENGINEERING 2015

Papers Proceedings »

Zero Steady-State Error PWM Control System for Sinusoidal Voltage

The paper presents a PWM control system of a sinusoidal voltage using a single-phase inverter that comprises at the output a LC low-pass filter with resistive load. The PWM control strategy of a sinusoidal voltage and the optimization of the control loop via the modulus criterion, for step input signals, are presented. The steady-state error of the PWM control system is analyzed for sinusoidal input signal and methods for reducing the steady-state error by increasing the switching frequency and by adding an integral element series to the modulus criterion optimized controller are presented. If analyzed as a linear system, the addition of an integral element would make the system unstable, due to a double pole in the origin, but it is shown that by analyzing the system as a nonlinear system having an ideal relay-type nonlinearity, stability is preserved. Further, knowing that the steady-state error for sinusoidal input can be nullified by introducing a resonant element, a new utilization of a resonant element is proposed, namely its introduction instead of the integral element in the optimal transfer function according to the modulus criterion. The theoretical considerations are confirmed by simulation results.

Author(s):

Dumitru Stanciu    
University Politehnica of Bucharest
Romania

Mihail Teodorescu    
University Politehnica of Bucharest
Romania

 

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