The wide range of output frequency regulation method for the inverter using the combination of PWM and DDS

• Wojciech Pietrowski ^[1] ; Wojciech Ludowicz ^[1] ; Rafal Marek Wojciechowski ^[1]
  1. [1] Poznan University of Technology, Polonia
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 38, Nº 4, 2019, págs. 1323-1333
• Idioma: inglés
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• Resumen

  • Purpose – The specific modulation methods are used to control different kind of single-phase, as well as three-phase, inverters to ensure flexibility and high quality of the output waveform. This paper aims to present a combination of two classical methods, namely, pulse width modulation method and direct digital synthesis modulation method .

    Design/methodology/approach – The total harmonic distortion of output waveforms of single-phase inverter based on elaborated modulation method has been determined by means of fast Fourier transform analysis. Tests have been carried out by using standard low-frequency application and also a wireless resonant energy link system.

    Findings – Applying appropriate timer parameters of microcontroller enables to obtain a waveform for given output parameters (amplitude, frequency, frequency modulation index, etc.). The only limitation is the computing power of a microcontroller.

    Originality/value – The elaborated method can be successfully used in both low- and high-frequency application ensuring high level of output waveform quality. Additional signal generators and the control of amplitude modulation ratio are no longer indispensable, what simplify immensely a control system.