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An Improvable Approach for PWM Control
(Universitatea Petrol ? Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti e-mail: gcremenescu@upg-ploiesti.ro)
Vol LX • No. 2/2008
Gheorghe Cremenescu
Universitatea Petrol ? Gaze din Ploieşti, Bd. Bucureşti 39, Ploieşti
e-mail: gcremenescu@upg-ploiesti.ro

 Keywords   PWM (pulse width modulation) control algorithm, mono--phase inverter, synthetic voltage

 Abstract
The article presents a mathematical support of the PWM control algorithm for the improvable synthesis of the output voltage of the mono-phase inverter, having as objectives the approaching of the effective value of the fundamental to the effective value of the proposed sinusoidal voltage at the terminals of the charge and diminishing of the weight of low frequency harmonics in the harmonic content of the voltage.
The commutation moments of the pulses are computed, imposing that the fundamental of the synthetic voltage is equal to the proposed sinusoidal voltage and the high harmonics up to order 4m-2 are null. For the numerical simulation of the model, the Matlab toolbox was used. The results of the simulation are numerically and graphically presented; they confirm the validity of the mathematical support of the proposed PWM control algorithm. The aim of this paper is to obtain an inverter which to ensure a power supply close to a sinusoidal form. Some practical considerations are also presented.
The paper was split in two parts. Part B includes a numerical simulation example of the mathematical design of the proposed PWM control algorithm presented in part A and some practical considerations.


 Rezumat
The article presents a mathematical support of the PWM control algorithm for the improvable synthesis of the output voltage of the mono-phase inverter, having as objectives the approaching of the effective value of the fundamental to the effective value of the proposed sinusoidal voltage at the terminals of the charge and diminishing of the weight of low frequency harmonics in the harmonic content of the voltage.
The commutation moments of the pulses are computed, imposing that the fundamental of the synthetic voltage is equal to the proposed sinusoidal voltage and the high harmonics up to order 4m-2 are null. For the numerical simulation of the model, the Matlab toolbox was used. The results of the simulation are numerically and graphically presented; they confirm the validity of the mathematical support of the proposed PWM control algorithm. The aim of this paper is to obtain an inverter which to ensure a power supply close to a sinusoidal form. Some practical considerations are also presented.
The paper was split in two parts. Part B includes a numerical simulation example of the mathematical design of the proposed PWM control algorithm presented in part A and some practical considerations.




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