Investigation of a cascaded H-bridge photovoltaic inverter under non-uniform insolation conditions by hardware-in-the-loop test
| Autor: | Sarath B. Tennakoon, Hossein Iman-Eini |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Total harmonic distortion
Computer science 020209 energy 020208 electrical & electronic engineering Energy Engineering and Power Technology 02 engineering and technology Series and parallel circuits H bridge law.invention law 0202 electrical engineering electronic engineering information engineering Grid connection Electronic engineering Waveform Inverter Electrical and Electronic Engineering Transformer Voltage |
| Zdroj: | International Journal of Electrical Power & Energy Systems. 105:330-340 |
| ISSN: | 0142-0615 |
| DOI: | 10.1016/j.ijepes.2018.08.017 |
| Popis: | In this paper, the cascaded H-bridge (CHB) multilevel inverter is employed as a grid connected inverter. This kind of inverter has interesting features compared to conventional inverters, including better efficiency, lower THD, lower common mode current injection, and better waveform quality. Using a series connection of H-bridge cells in this topology, a high modularity is achieved and a stepwise voltage waveform is synthesized at the ac side, leading to lower filter size and complexity. This topology processes the electric power in one stage and does not need any step-up voltage transformer for grid connection. The dynamic performance of control system is studied through simulations and is compared with the conventional approach. In addition, a new voltage estimation approach is proposed to reduce the number of voltage sensors compared to existing methods. The simulation results are presented for a 1.5 kW grid connected 7-level CHB inverter and then the hardware-in-the-loop implementation of the CHB inverter is presented to verify the performance of control system. |
| Databáze: | OpenAIRE |
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