21-01-2013, 04:51 PM
IMPLEMENTATION OF ROTOR CURRENT CONTROLLER IN WIND ELECTRIC GENERATOR
With shortage of mineral resources and aggravation of environmental pollution, countries all over the world pay more attention to the development of renewable "green" energy. Wind power plays an important role in renewable energy, so there has been increasing interest in the analysis of wind power in power system. However, the technology of wind turbine faces major challenges which are how to further improve efficiency, increase strength and reduce the cost. Both for reasons of network compatibility and to reduce mechanical loads, many large wind turbines (installed either offshore or onshore) will operate at variable speed and use doubly fed induction generators (DFIGs).The main advantage of the DFIG is the ability of variable speed operation with only 20-30% of the generated power passing through the power converters. Hence they provide a constant frequency electrical output. This yields considerable reduction in the converter size which translates to substantial system compared with the conversion of full power. The electrical energy efficiency of wind turbine systems equipped with doubly-fed induction generators in comparison to other wind turbine generator systems has been investigated.
The active power is controlled in order to be adapted to the wind speed in a wind energy conversion system and the reactive power control allows getting a unitary power factor between the stator and the grid.The objective of this project is to regulate the active and reactive power exchanged between the machine and the grid in a wind farm.
With shortage of mineral resources and aggravation of environmental pollution, countries all over the world pay more attention to the development of renewable "green" energy. Wind power plays an important role in renewable energy, so there has been increasing interest in the analysis of wind power in power system. However, the technology of wind turbine faces major challenges which are how to further improve efficiency, increase strength and reduce the cost. Both for reasons of network compatibility and to reduce mechanical loads, many large wind turbines (installed either offshore or onshore) will operate at variable speed and use doubly fed induction generators (DFIGs).The main advantage of the DFIG is the ability of variable speed operation with only 20-30% of the generated power passing through the power converters. Hence they provide a constant frequency electrical output. This yields considerable reduction in the converter size which translates to substantial system compared with the conversion of full power. The electrical energy efficiency of wind turbine systems equipped with doubly-fed induction generators in comparison to other wind turbine generator systems has been investigated.
The active power is controlled in order to be adapted to the wind speed in a wind energy conversion system and the reactive power control allows getting a unitary power factor between the stator and the grid.The objective of this project is to regulate the active and reactive power exchanged between the machine and the grid in a wind farm.