Abstract
With increasing installed capacity, wind farms are requested to downregulate more frequently, especially in the offshore environment. Determination and verification of possible (or available) power of downregulated offshore wind farms are the aims of the PossPOW project (see PossPOW.dtu.dk). Two main challenges encountered in the project so far are the estimation of wind speed and the recreation of the flow inside the downregulated wind farm as if it is operating ideally. The rotor effective wind speed was estimated using power, pitch angle and rotational speed as inputs combined with a generic Cp model. The results have been compared with Horns Rev-I dataset and NREL 5MW simulations under both downregulation and normal operation states. For the real-time flow recreation, the GCLarsen single wake model was re-calibrated using a 1-s dataset from Horns Rev and tested for the downregulated period. The re-calibrated model has to be further parametrized to include dynamic effects such as wind direction variability and meandering also considering different averaging time scales before implemented in full scale wind farms.
Highlights
Wind power plants are important players in the energy market which have the capability to reduce their power supply to the grid, in other words to offer downregulation services to the balancing market
Determination and verification of possible power of downregulated offshore wind farms are the aims of the PossPOW project
The results have been compared with Horns Rev-I dataset and NREL 5MW simulations under both downregulation and normal operation states
Summary
Wind power plants are important players in the energy market which have the capability to reduce their power supply to the grid, in other words to offer downregulation services to the balancing market. The performance of the model has been evaluated for both normal operation and downregulation periods using two different case studies: 1-s data from the Horns Rev-I wind farm and the NREL 5MW single turbine. Those estimated rotor effective wind speeds in the Horns Rev wind farm have been used to re-calibrate the GCLarsen single wake model to simulate the real time wind speed on the downstream turbine(s) which has to be extended to the wind farm scale to consider dynamic effects inside the farm. The latter version of coefficients with slight modifications (maximum change is less than 5 %) is applied where all the modifications are determined by the agreement between the modelled and the provided ideal CP curves
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