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A unified dynamic model and control for the voltage-sourced converter under unbalanced grid conditions
- Source :
- IEEE Transactions on Power Delivery. July, 2006, Vol. 21 Issue 3, p1620, 10 p.
- Publication Year :
- 2006
-
Abstract
- This paper introduces and develops i) a novel unified dynamic model, and ii) new control schemes for a grid-connected static energy conversion system that is based on the voltage-sourced converter (VSC) configuration. The model and the controls are applicable to both the conventional two-level and the three-level neutral point diode clamped (NPC) VSCs. The model is unified since it represents the dynamic behavior of the VSC with respect to both positive- and negative-sequence components, due to unbalanced grid conditions and disturbances. To develop the unified model, the concepts of 'generalized sinusoidal pulse-width modulation (SPWM)' and 'VSC sequence subsystems' are presented. Based on the negative-sequence subsystem control, a new control strategy, to either balance the ac line currents or to mitigate dc-bus voltage ripples, is introduced. Application of the developed model and the controls to a variable-speed wind-power unit is presented in the paper. Index Terms--Instantaneous symmetrical components, neutral point diode clamped (NPC) converter, sequence subsystems, unbalanced operation, voltage-sourced converter (VSC), wind power.
Details
- Language :
- English
- ISSN :
- 08858977
- Volume :
- 21
- Issue :
- 3
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Power Delivery
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.148574772