Abstract
The quality of service and the respect of contractual characteristics of the voltage is a major issue of the transmission system operator. In this context, the code requires that the wind turbine system participate in the regulation of the voltage. Any variation in voltage must be compensated by producing or absorbing reactive power. This article studies the modelling and control strategies of a wind energy conversion system based on a doubly fed induction generator. It presents a linear quadratic regulator with integrator (LQI) and an exact linearization feedback (ELF) controller for a doubly fed induction generator (DFIG). In the ELF technique, the nonlinear model of DFIG is linearized and the reference of active and reactive powers values are calculated by using reactive power management algorithm.The simulation results show that the decoupling control strategy for DFIG is satisfactory and the predefined operating conditions are respected.
Highlights
Many countries have established a set of specific requirements for wind energy, among others the connection between wind turbines and the transmission network
This paper investigates the doubly fed induction generator (DFIG), the exact feedback linearization technique applied to extracting the maximum power point Maximum Power Point Tracking (MPPT)
The simulations presented are performed with full order DFIG model, the results shown illustrate the performance of the EFL and linear quadratic regulator with integrator (LQI) controllers under different operating zones
Summary
Many countries have established a set of specific requirements for wind energy, among others the connection between wind turbines and the transmission network. This special requirement imposes new constraints on the production of all the parks. Reactive energy on the transmission network has two consequences: the first one is an increase in the current which causes heating of the links and transformers with greater losses. This consequence can conduce to oversize the transmission network installations. The second consequence consists of the voltage variation during the winter months, when the consumption of reactive energy accentuates the voltage drops
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