Abstract
The dual power flow wind energy conversion system (DPF-WECS) is a novel system which is based on the electrical variable transmission (EVT) machine. The proposed sensorless control for the DPF-WECS is based on the model reference adaptive system (MRAS) observer by combining the sliding mode (SM) theory. The SM-MRAS observer is on account of the calculations without the requirement of the proportional-integral (PI) loop which exists in the classical MRAS observer. Firstly, the sensorless algorithm is applied in the maximum power point tracking (MPPT) control considering the torque loss for the outer rotor of the EVT. Secondly, the sensorless control is adopted for the inner rotor control of the EVT machine. The proposed sensorless control method based on the SM-MRAS for the DPF-WECS is verified by the simulation and experimental results.
Highlights
Wind energy is nearly the most mature and promising renewable energy source at present
The electrical variable transmission (EVT) machine is regarded as the combination of two permanent magnet synchronous machines (PMSMs), the outer machine consists of the stator and the outer rotor and the inner machine consists of the inner rotor and the outer rotor
The outer machine produces electrical power loss described as Peloss1, including copper loss and iron loss
Summary
Wind energy is nearly the most mature and promising renewable energy source at present. Many strategies have been proposed for the rotor speed and position estimation in the PMSG drives, such as methods based on the back electromagnetic force (EMF), extended Kalman filter (EKF) methods, reduced observer methods, adaptive approaches, signal injection methods when in a low speed range, and so on [6,7,8,9] Among these techniques, the observer based on the MRAS is a very common choice to realize the sensorless control because of its simplicity and few calculations [10]. The performance of the proposed sensorless control for the DPF-WECS is validated by the simulation and experimental results, which is both applied in the outer rotor and inner rotor of the EVT.
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