Modelling and ride‐through capability of variable speed wind turbines with permanent magnet generators

Abstract

A model for a variable speed wind turbine with a permanent magnet, multipole, synchronous generator is developed and implemented in the simulation tool PSS/E as a user‐written model. The model contains representations of the permanent magnet generator, the frequency converter system with control, the aerodynamic rotor and a lumped mass representation of the shaft system. This model complexity is needed for investigations of the short‐term voltage stability and ride‐through capability of such wind turbines. Ride‐through capability is a major issue and, for the given concept, can be achieved by applying blocking and restart sequences to the frequency converter at the voltage drop in the power grid. Copyright © 2005 John Wiley & Sons, Ltd.

Predictive Control of Variable Speed Wind Energy Conversion System with Multi Objective Criterions

“…Several control algorithms of the WECS have been reported recently through the literature [1][2][3][4][5][6][7], whether for a wind system feeding an isolated load, or the network. The configuration of the present work is given by Fig.…”

“…Also, they allow a significant reduction of the power converters size and cost since the size of the converters is related to the speed variation range, typically around +/-30 % of the synchronous speed. Note that the main advantage of the WECS based DFIG machine is the perfect decoupling between active and reactive power control by controlling rotor currents [1][2][3][4][5][6][7][8].…”

“…In [3][4][5], the block diagram of the power control of the DFIG incorporates a cascaded structure with four PI regulators, two PIs in the outer loops for stator active and reactive powers and two PIs in the inner rotor currents loops with also an additional PI loop for the speed. As a consequence there exists degradation in the dynamic performance due to delay times of cascaded regulators and reduced robustness against model uncertainties.…”

Análise de turbinas eólicas conectadas ao sistema elétrico equipadas com geradores síncronos a ímãs permanentes.

“…As turbinas eólicas com caixa de velocidades menores podem começar a gerar energia em ventos mais baixos do que aqueles com caixas de engrenagens maiores devido à redução das perdas de energia mecânica [3]. No entanto, a redução na relação da caixa de engrenagens requer um aumento no número de pares de pólos do gerador, o que torna mais complexa essa construção [3].…”

“…No entanto, a redução na relação da caixa de engrenagens requer um aumento no número de pares de pólos do gerador, o que torna mais complexa essa construção [3]. Assim, a construção eletromagnética do PMSG é mais complexa do que no caso das concepções convencionais de turbinas eólicas, tais como: …”