Controlled bidirectional converter using PID for charging battery in the stand-alone wind turbine system with Modified P&O to obtain MPPT

The main problem which often occurs in wind turbine systems is getting the maximum power output and maintaining the DC link voltage at a constant value through wind fluctuation. This paper proposed to maintain the DC link voltage during stand-alone condition, it takes a battery as energy storage with a bidirectional buck-boost converter to regulate charging and discharging mode, alternately. Control of bidirectional DC-DC converter using PID controller. Meanwhile, Modified Perturbation and Observation algorithm to set switching of quadratic boost converter for obtaining the Maximum Power Point (MPP) of the wind energy system. The results of this research, the efficiency of wind turbine system can be improved up to 98,176% using the modified P&O.