Mppt Technique in Grid Connected and Standalone Pv Systems Research Papers (original) (raw)

The world’s wind resource is abundant, and has great development potential. In the traditional low rated wind generator, the mechanical friction
resistance between the bearings is too large, due to low wind speed in the city, usually it can’t start up when the wind speed is not big enough, whereas the
high rated ones produce lot of noise. In both cases the AMBs can be used to overcome their problems. Magnetic bearing is a mechanical and electrical
integration bearing which suspends and stabilizes the rotor with the electromagnetic force, compared with the general bearings, for no mechanical friction,
the damping of small wind generator with AMB can be minimized; power consumption is about 1/10 of ordinary bearings, which makes the wind generator
start up with low-speed wind. Active Magnetic Bearings (AMB) have many advantages such as no friction loss, no abrasion, lubrication free quality, and
used for high rotational speed applications. A complete AMB system consists of an actuator, power amplifier, a rotor position sensor and a control system. In
this paper, a closed loop decentralized Fuzzy Logic controller for Active magnetic Bearings is designed. For the numerical evaluation of control algorithm a
MIMO (multiple input multiple output) mathematical model of the controlled plant is determined. The AMB system which is open-loop unstable and highly
coupled due to nonlinearities inherited in the system such as gyroscopic effect and mass imbalance requires dynamic controller that can stabilize the system.
The majority of industrial applications of active magnetic bearings were still based on conventional PID control system. The proposed control design is based
on rule based procedure. It has been shown, that the presented FL control guarantees satisfactory high damping, low parameter variations and measurement
noise of the overall system. The designed FL controller is able to maintain the rotor in centre position in the final steady state. Simulations are provided to
illustrate the performance of the controller. This Paper deals with developing a model of an Active Magnetic Bearing (AMB), and its 1-DOF, 2-DOF, 4-DOF
model using a Fuzzy controller. The effectiveness of the proposed controller is compared with the conventional PID controller.