WindContQIEC : Documentation diagram
Created: 04/13/2012 06:48:33 PM
Modified: 06/24/2012 11:24:36 AM
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<b>Parameter Notes:</b><br /></p><p><ol><li>Warning: Extreme care should be taken in coordinating the parameters <b><i>u</i></b><b><sup>dbd1</sup></b>, <b><i>u</i></b><b><sub>dbd2</sub></b> and <b><i>u</i></b><b><sub>dip</sub></b>, <b><i>u</i></b><b><sub>up</sub></b> so as not to have an unintentional response from the reactive power injection control loop.</li><br /></p><p><li>The external reference <b><i>x</i></b><b><sub>WTTref</sub></b> is initialized as a constant input. If a park controller model is applied this signal takes the voltage (difference) or reactive power command from the park controller:  The “FRT detect” block outputs the <b><i>F</i></b><b><sub>FRT</sub></b> flag in 1 of 3 stages:  0) Normal operation (<b><i>U</i></b><b><sub>WTT</sub></b> > <b><i>U</i></b><b><sub>dip</sub></b>) and (<b><i>U</i></b><b><sub>WTT</sub></b> < <b><i>U</i></b><b><sub>up</sub></b>), 1) During fault (<b><i>U</i></b><b><sub>WTT</sub></b> < <b><i>U</i></b><b><sub>dip</sub></b>) or (<b><i>U</i></b><b><sub>WTT</sub></b> > <b><i>U</i></b><b><sub>up</sub></b>), 2) Post fault stays in stage 2 with (<b><i>U</i></b><b><sub>WTT</sub></b> > <b><i>U</i></b><b><sub>dip</sub></b>) and (<b><i>U</i></b><b><sub>WTT</sub></b> < <b><i>U</i></b><b><sub>up</sub></b>) for <i>t </i>= <b><i>T</i></b><b><sub>post</sub></b>.</li><br /></p><p><li>The “IQFRT mode” block selects the reactive current 1 during (<b><i>F</i></b><b><sub>FRT</sub></b><b> </b>= 1) and post (<b><i>F</i></b><b><sub>FRT</sub></b> = 2) fault 2 as a sum of contributions from the voltage dependent current <b><i>i</i></b><b><sub>qv</sub></b>, the frozen current <i>i</i><b><sub>qfrz</sub></b> and the constant post fault current <b><i>i</i></b><b><sub>qpost</sub></b>.  The WindContQIECIQFRTBlock diagram specifies 3 options which are presently used by the industry.</li><br /></p><p></ol><br /></p>