Abstract
Renewable energies such as wind or solar energy are naturally intermittent and can create technical challenges to interconnected grid in particular with high integration amounts. In addition, if wind or solar is used to supply power to a stand-alone system, continuous power supply will be met only if sufficient energy storage system is available. The global penetration of renewable energy in power systems is increasing rapidly especially wind and solar photovoltaic (PV) systems. Hybrid wind and solar PV generation system becomes very attractive solution in particular for stand-alone applications. It can provide better reliability since the weakness of one system could be complemented by the strength of the other one. When wind energy is integrated into grid, maximum power point tracking control could be used to optimize the output of wind turbine. In variable speed wind turbine, the turbine speed is varied according to the wind speed. This paper presents a comparison between two methods of controlling the speed of a wind turbine in a microgrid namely; Proportional-Integral (PI) control of the tip speed ratio and stored power curve. The PI method provides more controllability, but it requires an anemometer to measure the wind speed. The stored power curve method, however, is easier to implement, but the amount of energy extracted can be less. The system has been modelled using Matlab/Simulink.
Highlights
Solar Photovoltaic (PV) and wind energies are intermittent and unpredictable in nature
When wind energy is integrated into grid, maximum power point tracking control could be used to optimize the output of wind turbine
This paper presents a comparison between two methods of controlling the speed of a wind turbine in a microgrid namely; Proportional-Integral (PI) control of the tip speed ratio and stored power curve
Summary
Solar Photovoltaic (PV) and wind energies are intermittent and unpredictable in nature. Hybrid solar PV and wind power system along with batteries can minimize the effect of intermittency and provide continuous power to the load and/or grid. In grid-connected mode of operation, the renewable energy sources act as current sources that inject power directly into the DC bus. In stand-alone mode of operation, the renewable energy sources still act as current sources feeding directly the load while the battery converter regulates the DC bus by charging (in case of extra power) or discharging the battery (in case of shortage of power). The same thing is applicable in the stand-alone mode provided that the battery bank exists as a voltage source to control the DC bus voltage by charging or discharging depending on the status of generation and load requirement. Simulation results from simplified and detailed models will be presented
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