期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 68, 期 3, 页码 1994-2004出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.2972467
关键词
DC link voltage control; grid current control; grid impedance; parameter variation; voltage source inverter
资金
- Interreg CENTRAL EUROPE Programme under the European Regional Development Fund, through the project Integration and smart management of energy storages at historical urban sites (Store4HUC)
The article focuses on the mathematical modeling and control structure design of a grid-connected back-to-back voltage source inverter with an LC filter for current harmonics reduction. A cascaded three-loop control structure is designed to control the converter current, grid current, and dc link voltage. The proposed control structure shows robust performance for various parameter changes and grid impedance variations, as validated by simulations and experiments on a 7.5 kW converter.
The article elaborates on the mathematical modeling and control structure design of a grid-connected back-to-back voltage source inverter with a complex dc link and an LC filter for the current harmonics reduction. A cascaded, three-loop control structure is designed for controlling the converter current, the grid current, and the dc link voltage. The derived control structure, utilizing two sets of current sensors and a dc link voltage measurement, is based on proportional-integral controllers and a Truxal-Guillemin model-based controller for the dc link voltage control. The chosen control structure provides consistent results for great variations of the grid impedance. Robustness is tested for various scenarios of variations in grid filter parameters, controller parameters, chosen operating point for linearization, and grid impedance. Results are validated by simulations and experiments on a 7.5 kW converter and show highly robust performance for +/- 20% parameter change and a large span of grid impedance variation.
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