Abstract
This paper describes a technique for generating grid frequency support using variable speed wind turbines with augmented control. This augmentation to the central controller has the form of an additional outer feedback loop wrapped around the turbine central controller. The controller is generic and can be applied to a large range of turbines. No modification to the full envelope controller or converter design or operation is required. The support provided is in the form of synthetic inertia, which is an increase in power output proportional to the rate of change of grid frequency. This has an analogous effect upon frequency change as an increase in the inertia of the system. This increase in power is generated by converting kinetic energy in the rotating blades into electrical energy via an increase in the generator torque demand causing a reduction in rotational speed. After the grid frequency has recovered, power output is reduced as some of the energy from the wind is used to accelerate the blades back to their normal operating speed. The controller incorporates restrictions that prevent the operating point of the wind turbine from moving outside of a defined safe operating envelope, above the minimum rotor speed and outside of any undesirable operating areas. The controller required to provide synthetic inertia is described and results of the controller in use, as modelled in GL Bladed are shown. Additional results are shown of simulations designed to deliberately activate the safety features that prevent operation outside of the safe operational envelope.
Original language | English |
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Title of host publication | European Wind Energy Conference and Exhibition 2012 |
Publisher | WindEurope |
Pages | 153-160 |
Number of pages | 8 |
Volume | 1 |
ISBN (Print) | 9781627482912 |
Publication status | Published - 2012 |
Event | European Wind Energy Conference and Exhibition 2012 - Copenhagen, Denmark Duration: 16 Apr 2012 → 19 Apr 2012 |
Conference
Conference | European Wind Energy Conference and Exhibition 2012 |
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Abbreviated title | EWEC 2012 |
Country/Territory | Denmark |
City | Copenhagen |
Period | 16/04/12 → 19/04/12 |
Keywords
- Control
- Grid frequency
- Inertia
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Fuel Technology