Improving the harmonic composition of output voltage in multilevel inverters under an optimum mode of amplitude modulation
| Autor: | Oleksandr Plakhtii, Volodymyr Nerubatskyi, Dmytro Sushko, Denys Hordiienko, Hryhorii Khoruzhevskyi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
020209 energy
0211 other engineering and technologies Energy Engineering and Power Technology 02 engineering and technology Industrial and Manufacturing Engineering an optimum of the sinusoidal output voltage of an inverter Amplitude modulation Control theory Management of Technology and Innovation lcsh:Technology (General) 021105 building & construction 0202 electrical engineering electronic engineering information engineering lcsh:Industry Electrical and Electronic Engineering Mathematics Total harmonic distortion amplitude modulation Applied Mathematics Mechanical Engineering Computer Science Applications Amplitude Control and Systems Engineering Pulse-amplitude modulation Modulation Harmonics Harmonic lcsh:T1-995 lcsh:HD2321-4730.9 total harmonic distortion Voltage |
| Zdroj: | Eastern-European Journal of Enterprise Technologies, Vol 2, Iss 8 (104), Pp 17-24 (2020) |
| ISSN: | 1729-4061 1729-3774 |
| Popis: | One of the most important parameters of multilevel inverters is thesinusoidal output voltage. There are many different modulation algorithms, which make it possible to obtain different indicators of the sinusoidal output voltage and different content of the higher harmonics. This paper reports a universal modulation algorithm, which makes it possible to obtain the shape of the output voltage of a multilevel inverter at any number of stages, optimized for the content of the higher harmonics, namely a minimum of the coefficient of harmonic distortions. The proposed algorithm enables obtaining the lowest possible THD for any level voltage. The advantage of the proposed algorithm compared to similar optimization algorithms is ensuring smaller harmonic distortions, as well as its relative simplicity. The reported algorithm is based on the amplitude modulation of the sine signal with a 25% modulation relative to the highest discreteness. The analytical expressions have been given that make it possible to determine the time (angle) of enabling each level of the output voltage to form a minimum of the root mean square value of higher harmonics. To confirm the optimum analytic point, the MATLAB/Simulink programming environment was employed to design a series of multi-level voltage inverters, which form the five-, seven-, nine-, and eleven-level shapes of output voltage. The current study has shown that the optimum points for all shapes of multilevel voltages are achieved at the same coefficient of amplitude modulation. It has been demonstrated that the proposed modulation algorithm could also be used to control the amplitude and frequency of the output voltage in a multilevel inverter. The paper gives a control characteristic of the output voltage of a multilevel inverter at the pulse amplitude modulation |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|