OPF Studies: Strategies and Tips - PowerWorld
OPF Studies: Strategies and Tips - PowerWorld
OPF Studies: Strategies and Tips - PowerWorld
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Analysis of UnenforceableConstraints• Example: PJM Case• Initial solution has 16 unenforceable constraints• Of these many seem to be caused by radial– Change Limit Monitoring Settings to “Ignore RadialLines <strong>and</strong> Buses”• Radial Bus is connected to the system by only onetransmission line• Radial Line is a line connected to a radial bus.– Choosing this eliminates the unenforceableconstraintsJune 14-15, 20062006 <strong>PowerWorld</strong> Client Conference: <strong>OPF</strong> <strong>Strategies</strong> <strong>and</strong> <strong>Tips</strong> 3Unenforceable Constraints• Check unenforceable lines for VERY largeMVar flows– Add Columns for Max MW <strong>and</strong> Max MVar onLP <strong>OPF</strong>, Lines <strong>and</strong> Transformers• LTC tap ratios• Phase-shifters in series with an overloadedbranchJune 14-15, 20062006 <strong>PowerWorld</strong> Client Conference: <strong>OPF</strong> <strong>Strategies</strong> <strong>and</strong> <strong>Tips</strong> 42
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