Active Stall Regulation
The GWP47-750kW, designed by Norwin is an ASR regulated wind turbine with rotor diameter of 47m. The turbine uses LM 21.0P blades from LM Glasfiber. The blades can be turned to obtain optimal operational settings at both low and high wind speeds, a system we call ASR - Active Stall Regulation. The ASR wind turbines utilise the best things from both stall and pitch regulated wind turbines. An ASR turbine has the same regulation potential as a pitch regulated turbine; but by using the stall properties of the blades, the large load and power fluctuations that are typical for a pitch regulated machine are avoided.
Advantages of ASR
Basically this means: Using the advantages of a stall turbine and avoiding the disadvantages of a pitch regulated turbine.
- ASR will in general give a higher production because the blade angle is optimised according to the actual wind speed
- At high wind speed the power is stabilised because problems with air density changes, double-stall and changes in grid frequency are eliminated. This means that stand still due to over production is avoided, and that the loads on the gearbox and generator are minimised, resulting in a longer lifetime
- The ability to feather the blades in extreme wind speeds means that the characteristics of extreme loads are decreased compared to a normal stall regulated turbine
- It is possible for the turbine to regulate the power produced if the local grid has a high loading, by using a special unit for grid surveillance
- With blade regulation it is possible to make a much smoother cut-in to the grid at start up, and cut out at shut down. This will give less fluctuations on the grid during these situations and at the same time will extend the lifetime of the transmission and electrical system of the turbine.
Load control
The load on a wind turbine can vary a lot from site to site and development work has been conducted to develop a Load Control system where the turbine not only is controlled to reach nominal power, but also is controlled according to the loading history. The advantage of using such a system to ensure the projected lifetime of major components is achieved. The first phase of this work has been completed with the development of the control program for gearbox load control.
Full Service
Full Service means that GWP retains all internal technical risks for the product, replacement of spare part and maintenance. Also included is an availability warranty and costs are based on a price per kwh produced. GWP offers a first class quality product in combination with a Full Service Agreement that reduces your risks to a minimum. GWP´s solid financial position as a part of the Reliance ADA Group means that you can have confidence in this service offer.
