Analytical Design of Passive LCL Filter for Three-phase Two-level Power Factor Correction Rectifiers

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This paper proposes a comprehensive analytical LCL filter design method for three-phase two-level power factor correction rectifiers (PFCs). The high frequency converter current ripple generates the high frequency current harmonics that need to be attenuated with respect to the grid standards. Studying the high frequency current of each element proposes a non-iterative solution for designing an LCL filter. In this paper, the converter current ripple is thoroughly analyzed to generalize the current ripple behavior and find the maximum current ripple for sinusoidal PWM and third-harmonic injection PWM. Consequently, the current ripple is used to accurately determine the required filter capacitance based on the maximum charge of the filter capacitor. To choose the grid-side inductance, two methods are investigated. First method uses the structure of the damping to express the grid-side filter inductance as a function of the converter current ripple. Reducing the power loss in the filter and optimizing the grid-side filter inductance is the main focus of the second method which is achieved by employing line impedance stabilization network (LISN). Accordingly, two LCL filters are designed for a 5 kW silicon-carbide (SiC) based threephase PFC. Various experimental scenarios are performed to verify the filters attenuation and performance.
JournalIEEE Transactions on Power Electronics
StatePublished - 2017