StandardInterconnectionWindType4Aand4B : Documentation diagram
Created: 05/25/2012 12:35:08 PM
Modified: 06/18/2012 06:34:22 AM
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A dynamic model representing a type 4 wind generator and its related standard equipment models is associated with a dispersed generator in the static (power flow) model and has one of the two the standard interconnections shown above.<br /></p><p><br /></p><p>Type 4 wind turbines are connected to the grid through a full scale power converter.  Type 4 wind turbines use either synchronous generators (SG) or induction generators. Some type 4 wind turbines use direct drive synchronous generators, and have therefore no gearbox.<br /></p><p><br /></p><p>Type 4 wind turbines with choppers can normally be modelled neglecting the aerodynamic and mechanical parts of the wind turbine. Type 4 wind turbines without choppers inject post-fault power oscillations due to torsional oscillations. These oscillations are normally not affecting the power system stability, but the effect of torsional oscillations may be included using a two-mass mechanical model.<br /></p><p><br /></p><p>Therefore, two type 4 models are specified:<br /></p><p>  - Type 4A: a model neglecting the aerodynamic and mechanical parts<br /></p><p>  - Type 4B: a model including a 2-mass mechanical model assuming constant <br /></p><p>aerodynamic torque<br /></p><p><br /></p><p>The upper diagram describes a type 4A wind turbine and the lower diagram describes a type 4B wind turbine.<br /></p><p><br /></p><p>More information is contained in IEC Standard 61400-27-1 Section 6.4.4.<br /></p>