An improved method for harmonic mitigation and stability improvement of the grid-connected inverters under local load variation and weak grid condition
| Autor: | Elham Samavati, Hamid Reza Mohammadi |
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| Rok vydání: | 2020 |
| Předmět: |
Admittance
Computer science 020209 energy 020208 electrical & electronic engineering Phase angle Energy Engineering and Power Technology 02 engineering and technology Grid Nonlinear system Control theory Harmonics 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering MATLAB computer Active filter computer.programming_language Voltage |
| Zdroj: | International Journal of Electrical Power & Energy Systems. 123:106310 |
| ISSN: | 0142-0615 |
| DOI: | 10.1016/j.ijepes.2020.106310 |
| Popis: | Variable voltage and current harmonics appear to be critical challenges for grid-connected inverters at the point of common coupling (PCC). The nonlinear local load and grid impedance variations contribute a lot to the problem. In this paper, a novel control strategy is proposed using the variable virtual admittance (VVA) and series active filter concepts capable of improving harmonic mitigation and stability in grid-connected inverters. The magnitude and phase angle of the VVA are adaptively determined according to the local load variation. Moreover, the series active filter injects a series voltage to reduce the grid impedance effect. The proposed control method can be simply implemented, where sinusoidal grid-injected current and sinusoidal local load voltage can also be achieved under local load variation and weak grid condition. The theoretical approach is verified using several simulation case studies in Matlab/Simulink software. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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