Abstract
In order to alleviate the effect of the grid voltage on the grid current, Chap. 6 presented the full-feedforward scheme of grid voltages for the single-phase LCL-type grid-connected inverters, and the harmonics of the injected grid current are effectively suppressed. In this chapter, the full-feedforward scheme is extended to the three-phase LCL-type grid-connected inverter. In this chapter, the mathematical models of the three-phase LCL-type grid-connected inverter in both the stationary α–β frame and synchronous d–q frame are derived first. Then, based on the mathematical models, the full-feedforward schemes of the grid voltages for the stationary α–β frame, synchronous d–q frame, and decoupled synchronous d–q frame-controlled three-phase LCL-type grid-connected inverter are proposed. After that, the full-feedforward functions are discussed, and it will be illustrated that the simplification of the full-feedforward function should be taken with caution and simplifying the full-feedforward functions to a proportional feedforward function will give rise to the amplification of the high-frequency injected grid current harmonics. The effect of LCL filter parameter mismatches between the actual and theoretical values is also evaluated. Finally, the effectiveness of the proposed full-feedforward schemes is verified by the experimental results. Meanwhile, the performance of the proposed full-feedforward schemes under unbalanced grid voltage condition is intentionally investigated.
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Ruan, X., Wang, X., Pan, D., Yang, D., Li, W., Bao, C. (2018). Full-Feedforward Scheme of Grid Voltages for Three-Phase LCL-Type Grid-Connected Inverters. In: Control Techniques for LCL-Type Grid-Connected Inverters . CPSS Power Electronics Series. Springer, Singapore. https://doi.org/10.1007/978-981-10-4277-5_7
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DOI: https://doi.org/10.1007/978-981-10-4277-5_7
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