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Classical wind energy conversion systems are usually passive generators. The generated power does not depend on the grid requirement but entirely on the fluctuant wind condition. A dc-coupled wind/hydrogen/supercapacitor hybrid power system is studied in this paper. The purpose of the control system is to coordinate these different sources, particularly their power exchange, in order to make controllable...
The paper proposes a Fuzzy logic approach for controlling three-level NPC converters in stand alone wind energy systems. A key function of this controller is to maintain constant voltage and frequency for customers while maintaining smooth voltage waveform with less filtering requirements. The principle of the proposed Fuzzy controller is based on a modified PI approach in which the error and its...
This paper discusses the solutions for large-scale centralized monitoring and control of wind farms in remote power dispatching center. The structure and function of the centralized monitoring and control system for large-scale wind farms is Introduced. Through the OPC interface, the integrated communications management terminal installed in the wind farm communicates with the local wind farm monitoring...
The predictive direct power control (P-DPC) strategy computes the application times of several voltage-vectors included in a predefined sequence. Until now only approximate solutions of the P-DPC have been presented. This contribution proposes two improvements to the P-DPC: the exact solution of the control problem and the fastest possible transient.
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
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