Abstract
As the interface between renewable energy power generation system and the power grid, the grid-connected inverter is used to convert the dc power to the high-quality ac power and feed it into the power grid. In the grid-connected inverter, a filter is needed as the interface between the inverter and the power grid. Compared with the L filter, the LCL filter is considered to be a preferred choice for its cost-effective attenuation of switching frequency harmonics in the injected grid currents. To achieve high-quality grid current, the LCL filter should be properly designed. In this chapter, the widely used pulse-width modulation (PWM) schemes are introduced, including the bipolar sinusoidal pulse-width modulation (SPWM), unipolar SPWM and harmonic injection SPWM. The spectrums of the output PWM voltage with different SPWM are studied and compared. A design procedure for LCL filter based on the restriction standards of injected grid current is presented and verified by simulations.
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Ruan, X., Wang, X., Pan, D., Yang, D., Li, W., Bao, C. (2018). Design of LCL Filter. 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_2
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DOI: https://doi.org/10.1007/978-981-10-4277-5_2
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Publisher Name: Springer, Singapore
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Online ISBN: 978-981-10-4277-5
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