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This paper presents a novel sensorless maximum power point tracking (MPPT) algorithm for the new dual power flow (DPF) wind energy conversion system (WECS) which is based on electrical variable transmission (EVT) machine. The optimum current given (OCG) MPPT strategy is proposed for the outer rotor of the EVT machine. The algorithm works in two stages: In the first stage, the relationship between...
In the conventional direct torque control (DTC) using space-vector modulation (SVM) of induction machine (IM) drives, at least three current sensors are needed. In this paper, a low-cost SVM-DTC strategy is proposed, in which only single current sensor is used. The position of voltage space vector is divided into two areas: effective and non-effective area. If it is located in the non-effective area,...
In this paper, based on a dual mechanical port machine (DMPM), a novel dual power flow wind power generation system (DPF-WPGS) is proposed and analyzed. The operation principle of DPF-WPGS and the dynamic model of DMPM are introduced. The control strategies are analyzed and simulated in Matlab/Simulink. To evaluate the performance of DMPM-based WPGS, two other conventional WPGSs, namely, the direct-drive...
A new constant-frequency double-rotor (CFDR) generator for the wind power generation is proposed in this paper. The CFDR generator needs only part-size power converter which is the same as that of the doubly-fed induction generator. As permanent magnets are mounted on the outer rotor of the CFDR generator, high performances may be achieved. In this paper, the structure of the double-rotor generator...
In this paper, a review focused on the control theory of induction machines (IM) is presented. Then, the influences of dead time and voltage drop of switching devices are discussed. Consequently, considering both effects of dead time and voltage drop, an improved stator flux observation strategy for the direct torque controlled (DTC) EVI drive system is proposed. A simulation model is developed and...
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