Alternative Braking Method for Small Scaled-Wind Turbines Connected DC Green House with Analogical Experiment on Blade Destruction

Abstract

To supply a stable and efficient electricity, small-scaled wind turbine's brake system plays an immense role in various wind speeds. Small-wind power generation systems are difficult to operate in strong wind region since the turbine could be over-rotated and damaged if the brake system is not robust enough to maintain a stable angular velocity. Most of the smallscaled wind turbines use friction brakes to control the turbine speed for a stable electricity output. Since the friction brake are run out of time and needs frequent maintenance and eventually replacement, we introduce an eddy current based wind turbine brake system which is contactless with the rotor as an alternative to the friction brake system. The advantage of the proposed brake system is that the energy loss due to the friction will be reduced and will be more durable than the friction brake. The flow of this study is at first we did the analogical experiment of blade destruction to set to the maximum allowed angular velocity. Later, in order to verify the performance and stability requirement the mathematical implementation of eddy current brake system have done in DC-Green house for various wind penetration. Eventually the feasibility of eddy current brake system is confirmed in simulation results.

Maximum Power-Point Tracking and Stall Control with Eddy Current Brake System on Small-Scaled Wind Turbines and its Application on Agricultural Harvesting

“…This formula stands for controlling the brake plate rotation in a contact manner. However, in [8] we have proposed for contactless break system that is shown as follows.…”

“…Considering brake control, it is mainly focus on brake pad-based system for the safety of the wind turbine [7] while contactless brake systems related research is ongoing currently. In [8] we proposed to realize a contactless angular velocity in emergency case by eddy current method, however, the optimal control was not concerned. In this research, we are focusing to enhance the power through maximum power point tracking (MPPT) using eddy current brake system and eddy current brake system for emergency rotational control.…”