GovHydro4 : Documentation diagram
Created: |
03/04/2012 15:49:32 |
Modified: |
03/01/2013 22:41:50 |
Project: |
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Author: |
pcha006 |
Version: |
1.0 |
Advanced: |
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ID: |
{1F0F6C06-17AA-478a-A4CC-81739074A9F3} |
<b>Parameter Notes:</b><br/><ol>
<li>The gates travel over a range of 1.0 per unit from fully closed to fully opened. The gates are at a position greater than zero at zero power and, normally, less than 1.0 when power is 1.0 PU <b>Gmax</b> and <b>Gmin</b> are operating limits.</li><li>The characteristics of the turbine can be represented by three different gate-head-flow-power characteristics: a) Simple General Purpose Model: a simple linear relationship given by <b>At, Qnl </b>as shown in the GovHydro4SimpleHydroTurbine diagram, b) Francis/Pelton Turbine Model: a nonlinear relationship between flow and gate opening as shown in the GovHydro4FrancisPeltonTurbine diagram and described by <b>Gv0, Pgv0</b>, thru <b>Pgv5</b> and c) Kaplan Turbine Model: a nonlinear relationship between flow, gate, and blade angle as shown in the GovHydro4KaplanTurbine diagram and described by <b>Gv0</b>, <b>Pgv0</b>, thru <b>Pgv5</b>, and <b>Bgv0</b> thru <b>Bgv5</b>. The Kaplan turbine model is the same as for the GovHydro1 model.</li><li>The simple turbine model is selected by omitting <b>Gv0</b> and all following parameters from the parameter list. (Note - you could set <b>Gv0</b> and all following parameters to zero, except <b>hdam</b> which should be set to the appropriate nonzero value to describe the available head). The simple model will normally have a value slightly greater than unity for <b>At</b> and a value in the range 0 - 0.15 for <b>Qnl</b>.</li><li>The Francis/Pelton turbine model is invoked by specifying values for <b>Gv0</b>, <b>Pgv0</b>, through <b>Gv5</b>, <b>Pgv5</b> as shown in the GovHydro4FrancisPeltonTurbine diagram. The values of <b>Gv0</b> - <b>Gv5</b> must be in increasing order and <b>Gv5 </b>must be less than unity. The values of <b>Pgv0</b> must be in increasing order and the value of <b>Pgv5</b> must be less than unity. If <b>Gv0</b> is greater than 0., the first two data points will be used to extrapolate downward for gate positions less than <b>Gv0</b>. The curve described by <b>Gv0</b> - <b>Pgv5</b> describes the relationship of flow through the turbine to stroke of the gate actuating servomotor. This curve is proportional to turbine power, with the constant of proportionality being a function of available head. This constant must be specified by the turbine gain, <b>At</b>. If <b>Gv0</b> is a negative number, the default hydro curve will be used. If all zero values are provided, a straight line is used. This option is provided for compatibility with older data bases of the now-discontinued WSCC dynamic simulation program and should be used only when needed for that compatibility.</li></ol><p/>