A New Discrete-Time Voltage Controller Based on the Internal Model Principle for Three-Phase Voltage Source PWM inverters with ∆Y Output Transformer

FERNANDO BOTTERÓN, HUMBERTO PINHEIRO, HÉLIO L. HEY, JOSÉ R. PINHEIRO AND HILTON A. GRÜNDLING

Aachen - Alemania

Congreso; PESC 2004; 2004

Abstract. — In this paper a new digital voltage controller based on the internal model principle for three-phase inverters with ΔY transformer at the output is proposed. A dynamic model of the inverter, transformer, filter and load is derived and a decoupling method is proposed. The proposed digital controller is not prone to produce DC components, which that can lead to the output transformer saturation. Additionally, this digital controller result in a simple form and it is well suited for a fixed-point implementation. Experimental results, implemented in 16 bits DSP TMS320F241, validate the theoretical developments and demonstrate the good performance of the proposed controller under both nonlinear balanced and unbalanced loads.