Generalized Model-Based Controller for 3-Phase CHB-nL Converters in Power Filter Applications

Resumen: This research paper aims to address a control methodology for a 3-phase cascaded H-bridge (CHB) converter, in the general case of n-levels (CHB-nL). The proposed method is used not only to eliminate the harmonic currents caused by non-linear loads, but also to compensate reactive power. For these goals, the generalized model of the CHB-nL converter is first introduced by including the effect of the line impedance. The control objectives are defined in terms of current tracking, and voltage balance and regulation in all H-bridges. Then the suggested controller must guarantee tracking of the line current towards an appropriately defined reference by an inner control loop. In the proposed approach, the current reference is selected to be proportional to the line voltage. The proposed controller also includes outer voltage loops to guarantee regulation and balance of the involved capacitor voltages. The accuracy and performance of the proposed controller are evaluated in simulation under load variations and unbalance conditions during the startup period and steady-state stage.

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K.O. Mtepele, D.U. Campos-Delgado, A.A. Valdez-Fernández, P. R. Martínez-Rodríguez & G. Escobar. Generalized Model-Based Controller for 3-Phase CHB-nL Converters in Power Filter Applications. Memorias del Congreso Nacional de Control Automático, pp. 31-36, 2019.

Palabras clave

Control Basado en pasividad, Control de Sistemas No Lineales, Sistemas Eléctricos de Potencia

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