A New Controller for Wind Farms Giving Improved Network Stability

BACKGROUND The increasingly wide spread use of wind generation on power networks imposes a greater requirement for wind-farms to contribute to security of network operation in the same way as conventional generating stations based on synchronous generators. DFIG controllers to date have concentrated mainly on the provision of an adjustable operating speed to maximise turbine power output, the maintenance of the required generator terminal voltage or power factor and the control of the generator torque to match that of the wind turbine. Control has concentrated on preserving acceptable conditions for the DFIG and little or no attempt been made to provide the capability of contributing to the security of network operation. The new controller algorithm for the first time provides a DFIG based wind-farm with operational and control compatibility with conventional power stations, the ability to contribute to voltage support and recovery following network faults, the provision of a power system stabiliser facility and short term frequency support following loss of network generation. THE TECHNOLOGY A new controller for a Doubly Fed Induction Generator (DFIG) has been developed that enables wind farms to mimic synchronous generators and contribute to the stability of the distribution network. This includes contribution to voltage control and recovery following network faults, the provision of a power system stabiliser facility and short-term frequency regulation, as required by the Grid Codes. KEY BENEFITS The controller provides a DFIG based wind farm with: -
• a reduction in customer interrupts and customer lost minutes
• the ability to mimic synchronous generators as used in conventional power stations. This is not possible with existing DFIG controller methods thereby giving a competitive edge over wind generator suppliers not using this technology
• operational and control compatibility with conventional power stations to work seamlessly on the national grid
• the ability to contribute to voltage control and recovery following network faults hence reducing wind farm downtime APPLICATIONS
• On and off shore wind generation
• Large and small windfarms PATENT STATUS
• PCT patent application filed OPPORTUNITY
• Evaluation licence
• Computer modelling of performance in client system
• Collaborative development with a view to licensing the technology

Type of Offer: Licensing



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