Hybrid SHM-SHE Pulse-Amplitude Modulation for High-Power Four-Leg Inverter
| Autor: | Mohammad Khenar, R. Portillo, Leopoldo G. Franquelo, Kamal Al-Haddad, Abdolreza Sheikholeslami, Mohammad Sharifzadeh, Hani Vahedi |
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| Rok vydání: | 2016 |
| Předmět: |
Engineering
business.industry 020209 energy 020208 electrical & electronic engineering Modulation index 02 engineering and technology Harmonic analysis Control and Systems Engineering Pulse-amplitude modulation Control theory Modulation Harmonics 0202 electrical engineering electronic engineering information engineering Harmonic Inverter Electrical and Electronic Engineering business Pulse-width modulation |
| Zdroj: | IEEE Transactions on Industrial Electronics. 63:7234-7242 |
| ISSN: | 1557-9948 0278-0046 |
| DOI: | 10.1109/tie.2016.2538204 |
| Popis: | This paper presents a hybrid selective harmonic mitigation (SHM)-selective harmonic elimination (SHE) switching technique based on pulse-amplitude modulation (PAM) concept. It has been applied on a four-leg neutral-point-clamped (NPC) inverter to eliminate and mitigate more harmonic orders than recently proposed hybrid SHM-SHE-pulse width modulation (PWM) method while generating switching pulses at the same frequency. In conventional SHE and SHM techniques, equations are solved to attain the switching angles. Regarding the PAM, value of inverter dc voltage can be considered as an additional degree of freedom by which the flexibility of such techniques would be increased maintaining the switching frequency. In the proposed SHM-SHE-PAM, the conventional equations are reformulated to obtain constant switching angles for a vast range of modulation index $(m_{a})$ applied on a four-leg NPC inverter. Switching pulses of the three-phase legs and the fourth leg are calculated to mitigate the nontriplen harmonics and eliminate the triplen ones, respectively. Due to the unique switching angles valid in the whole range for $m_{a}$ , the calculation time and volume (storage capacity) are significantly reduced leading to a simpler controller implementable on a low-risk and cheap AVR chip. Experimental tests’ results of a four-leg NPC inverter as UPS application prove the good dynamic performance and accuracy of the proposed implemented switching technique in producing associated pulses for the inverter switches at very low frequency to mitigate/eliminate undesired harmonic orders from the output phase/line voltage waveforms without using bulky filters. |
| Databáze: | OpenAIRE |
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