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This paper aims to develop a coordinated controller to enhance the low voltage ride through (LVRT) performance of a permanent magnet synchronous generator (PMSG) based variable speed wind energy conversion system (WECS). This coordinated control comprises of a pitch angle control, a flux weakening control and a static synchronous compensator (STATCOM) control. The pitch angle control is adjusted to...
A decoupled active-reactive power control technique is proposed for an oscillating water column (OWC) based wave energy conversion system adopting grid connected doubly fed induction generator (DFIG). The effectiveness of the technique is investigated under various rotor speed and reactive power reference commands. The results show enhanced performance, better tracking, and improved transient response.
Model predictive torque control (MPTC) is a kind of powerful control scheme for high performance control of induction motor (IM) drives, which provides very quick dynamic response. However, MPTC suffers from tedious and time-consuming tuning work for the weighting factors, which is an obstacle for its application, especially in the multilevel converters. To solve this problem, this paper proposes...
Conventional table-based direct power control (DPC) achieves quick dynamic response with very simple structure, which has been widely studied for power control of doubly fed induction generator (DFIG) system. However, DPC presents high steady power ripples and rich current harmonics with variable switching frequency. Furthermore, it would produce highly distorted stator current and power oscillations...
In this paper a position sensorless control applied to a synchronous reluctance machine for an industrial drive application is discussed. For a given stator of an induction machine a synchronous reluctance rotor with flux barriers is designed by finite element methods and a prototype machine is built up. In this application the synchronous reluctance machine drive has already replaced the induction...
Rotor time constant is a key parameter in an induction motor drive with indirect field oriented control. In this paper, a modified Model Reference Adaptive Controller (MRAC) utilizing d-axis stator voltage is proposed for online updating of rotor time constant. Compared with the traditional d-axis voltage model, the information of torque current and stator frequency is incorporated into the adaptive...
Excitation fault is troublesome because it takes a negative impact on the overall performance of the doubly salient electromagnetic machine (DSEM). To deal with the excitation fault, this paper studies the machine design and fault-tolerant control strategies for DSEM driving system with three-phase full-bridge converter. With the view of the unique electromagnetic structure of DSEM, this paper analyzes...
Recently, multiphase induction machines are proposed to replace traditional three-phase drives in low-voltage large power applications with high fault-tolerance ability. This paper concentrates on their speed sensorless vector control algorithm of multiphase induction machine. A full-order adaptive observer is adopted to observe the rotor flux and rotor speed, and a harmonic suppression method combined...
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