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This paper presents a synthesis of a switching table by means of sliding mode theory for a direct power control (DPC) of electrical systems. It is applied to the control of a variable speed wind system based on a doubly fed induction generator (DFIG). Control of active and reactive stator power exchanged with the grid is achieved by delivering to rotor side converter (RsC) references voltage rotor...
This paper studies the impacts of grid voltage swell on the dc-link voltage for doubly fed induction generator (DFIG). A flexible algorithm of the dc-link voltage is proposed to meet the requirements of wide variation in grid voltage. The dc-link voltage reference is regulated with the variation of grid voltage. Thus, the dc-link voltage is maintained to a constant during normal operation but a relatively...
This paper presents an enhanced direct power control (DPC) algorithm for doubly fed induction generators (DFIG) capable of reducing the common mode voltage (CMV). Nowadays the DFIG is often used in high power wind energy conversion systems (WECS). A common problem of converter fed induction machines are the bearing damages due to the bearing currents. The source of this problem is the common mode...
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