Adaptive and Exact Linearization Control of Multicellular Power Converter Based on Shunt Active Power Filter

[摘要] Most research work on active power filter (APF) uses constant DC bus voltage. However, variable nonlinear load might affect the stability of these APFs and increase the power switching loss and voltage stress on switches. In this work, the contribution is twofold. First, regulate the DC bus voltage of APF, adaptively, with the nonlinear load variations and generate the reference of the harmonic currents based on the instantaneous power theory. Second, track this reference to mitigate harmonics of the grid-side current by the exact linearization control of three-phase multicellular power converter with reduced rating power switches and reduced power switching loss under variable nonlinear load. Simulation results with comparison study with classical topology of power converter demonstrate that the adaptive exact linearization control enhances the power quality with a minimum power switching loss and reduces the total harmonic distortion of grid-side current to a value that satisfies the limits of IEEE standard. Moreover, the DC bus voltage changes, adaptively, according to different values of nonlinear load power.

[学科分类] 自动化工程

[关键词] Shunt active power filter (SAPF);Multicellular power converter;Adaptive exact linearization control;Variable DC bus voltage