It is impossible to decide which of the described systems is best, unless they arecompared under the same circumstances. It all depends on the user’s needs and his orher abilities of providing data. Zephyr, AWPT and SIPREOLICO are probably super-ior regarding the entire prediction horizon from 1 to 48 hours. However, the costsrelated to setting up the system are high, especially for collecting online data.Systems using physical equations, such as Prediktor or Previento, require the exactlocation and environment of the wind farms they predict. They also need a longcomputation time to transform the geostrophic wind speed down to the hub heightsof the wind turbines, with WAsP or similar programs. Statistical models, such as WPPTand AWPT, however, need time to learn the correlation between wind and power whenthey are being set up, but they require only a minimum of computing time. The ANEMOSproject, funded by the European Commission, compares different approaches offorecasting and is developing a new system that is expected to outperform the existingsystems (http://anemos.cma.fr).All prediction systems have produced unsatisfactory forecasts in the followingsituations:
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