This papea• presents a m0l:111ts. The proposed MPCC for TPFSC follows the curren! references with ga-eal accuracy, whereas the switching fe quency ofthe insul:1ted-g:1le bipol:ir 11":msislor (IGBTs) is fixed :md low, This method minimizes the cun•enl 1-eference trncking error, :md its fost response m:1kes it 1mit:1ble ÍOI º the power take-olT sys tems present in wave enet•gy converlers. Furthermore, the system featm-es a fost c;1pacitor volt:1ge offset sup1>1-ession control The dy n:1111ic pet•fonn:mce :md the voltage offset control of the proposed slmteg�• for TPl•SC feeding :1 SPMSG is evalu:1ted in the Simulink ean-ironment. Late.-, ex perimental studies :11-e c:m•ied out on :m 8.7 kW l:1bor:1tory SPMSG prototype. l• in:1lly, the capability of the 1>roposed meth01:ml emul:1tor.
Abstract:Among all the different types of electric wind generators, those that are based on doubly fed induction generators, or DFIG technology, are the most vulnerable to grid faults such as voltage sags. This paper proposes a new control strategy for this type of wind generator, that allows these devices to withstand the effects of a voltage sag while following the new requirements imposed by grid operators. This new control strategy makes the use of complementary devices such as crowbars unnecessary, as it greatly reduces the value of currents originated by the fault. This ensures less costly designs for the rotor systems as well as a more economic sizing of the necessary power electronics. The strategy described here uses an electric generator model based on space-phasor theory that provides a direct control over the position of the rotor magnetic flux. Controlling the rotor magnetic flux has a direct influence on the rest of the electrical variables enabling the machine to evolve to a desired work point during the transient imposed by the grid disturbance. Simulation studies have been carried out, as well as test bench trials, in order to prove the viability and functionality of the proposed control strategy.
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