IIIE   20352
INSTITUTO DE INVESTIGACIONES EN INGENIERIA ELECTRICA "ALFREDO DESAGES"
Unidad Ejecutora - UE
artículos
Título:
Control Strategy for Hardware Simplification of VSC-Based Power Applications
Autor/es:
ANDRES E. LEON; JORGE A. SOLSONA; MARIA I. VALLA
Revista:
IET POWER ELECTRONICS
Editorial:
INST ENGINEERING TECHNOLOGY-IET
Referencias:
Año: 2011 vol. 4 p. 39 - 50
ISSN:
1755-4535
Resumen:
A hardware simplification control strategy for three-phase voltage-source-converter-based power applications is presented. The main goal of the proposal is to reduce the number of sensors needed to implement the controller while maintaining the high performance of the system. To this end, ac-voltage and dc-current sensors are replaced by software sensors based on state observers. Consequently, a more rugged, smaller and cheaper realization can be accomplished. Regarding the voltage source converter controller, an energy function and the reactive power of the converter are considered as outputs for constructing a feedback law based on Feedback Linearization technique. In this way, internal dynamics is avoided. In order to improve the controller performance, estimates of the load power and its time-derivative are feedforwarded. The ac-voltages and load power estimates are obtained by designing a reduced-order nonlinear observer. Several tests, with a realistic VSC model that takes into account the switching power devices, validate the proposed technique. They evaluate the system performance in presence of parameter uncertainties, and disturbances in the ac input voltage.