Abstract
This paper addresses the design and analysis of a voltage and frequency control (VFC) strategy for full converter (FC)-based wind energy conversion systems (WECSs) and its applicability for the supply of an isolated load. When supplying an isolated load, the role of the back-to-back converters in the FC must change with respect to a grid-connected application. Voltage and frequency are established by the FC line side converter (LSC), while the generator side converter (GSC) is responsible for maintaining constant voltage in the DC link. Thus, the roles of the converters in the WECS are inverted. Under such control strategies, the LSC will automatically supply the load power and hence, in order to maintain a stable operation of the WECS, the wind turbine (WT) power must also be controlled in a load-following strategy. The proposed VFC is fully modelled and a stability analysis is performed. Then, the operation of the WECS under the proposed VFC is simulated and tested on a real-time test bench, demonstrating the performance of the VFC for the isolated operation of the WECS.
Highlights
Among renewable energies, wind energy conversion systems (WECSs) are some of the most relevant, with more than 432 GW installed by 2015 [1]
This paper has presented the design and implementation of a voltage and frequency control (VFC) strategy for WECSs and its application for supplying an isolated load
Frequency control is achieved through the orientation of the voltage vector along an axis rotating at the reference frequency, avoiding the use of a phase-locked loop (PLL) for frequency measurement
Summary
Andrés Peña Asensio * ID , Santiago Arnaltes Gómez ID , Jose Luis Rodriguez-Amenedo, Manuel García.
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