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Discrete-time internal model controller for three-phase PWM inverters with insulator transformer

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2 Author(s)
F. Botteron ; Power Electron. & Control Res. Group GEPOC, Santa Maria, Brazil ; H. Pinheiro

A new digital voltage controller is proposed, derived in agreement with the internal model principle for three-phase inverters with ΔY transformer at the output. A dynamic model of the inverter, transformer, filter and load in stationary α-β co-ordinates is derived and a decoupling method is proposed. The proposed digital controller is not prone to amplify DC components, which can lead to output transformer saturation. Additionally, this digital controller results in a simple form and is well suited for fixed-point implementation. Experimental results, implemented in a 16-bit DSP controller, validate the theoretical developments and demonstrate the good steady-state performance of the proposed controller under both nonlinear balanced and unbalanced loads.

Published in:

IEE Proceedings - Electric Power Applications  (Volume:153 ,  Issue: 1 )