Loadflow ^{Version 3.0.6 : Feature Note-119 08/06/1999}

Following requests from users we have extended the range of shunts to include Constant Current shunts and a new class of Special Shunt. The Constant Current Shunts can be specified in either Amperes or kilo-Amperes. They maintain constant current down to 0.5 p.u. in Loadflow. Below 0.5 p.u. voltage they become fixed impedance where the impedance is 'frozen' at that value which would give target current at 0.5 p.u. voltage. The class of Special Shunt was created for a specific customer and instances of this class cannot be created by other users. However, we have designed the software to be extensible in this area and would be interested in your views as to whether or not other shunt characteristics would be of interest to you. Whilst carrying out this work we also improved the way PQ shunts are handled. They now maintain constant current down to 0.8 p.u. in Loadflow. Below 0.8 p.u. voltage they become fixed impedance where the impedance is 'frozen' at that value which would give target current at 0.8 p.u. voltage. As before, all shunts are fixed at their loadflow impedance values for the other calculation engines.