power system dynamics part 1-manual

7/24/2019 Power System Dynamics Part 1-Manual

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! Governor response has time delays associated with its delivery! Governor response provided with shorter time delays has a higher reliability

value as the shorter time delays require less inertial response to arrestfrequency

! Time delays associated with governor response vary depending on the typeof turbine-generator providing the response

" The longest time delays are usually associated with high head hydro#*(1%that have long delays ( I&$G+I% AB %&0"*/%Ofrom the initialgovernor response to + 7+1&$ Y"7 (*0$&+%&through the turbin &

" Intermediate time delays are usually associated with steam turbine/generators

! The delivery times associated with the full delivery of responsemay require the steam to flow through high, intermediate &low pressure turbines including reheat flows before full MW isdelivered

" Gas turbines typically have the shortest time delays! ! ontrol changes can be initiated rapidly & the mass flow has

the shortest path to the turbine blades! ;G& 7(1G/$+7+, "2 $&%I"*%& /#& 1" 1G& ,"%% "2 %1&+9 I$&%%#$& (* %1&+9 #*(1% 9+-

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! The scheme described above & on the next few pages is called thecoordinated plan

" Areas of the WECC may develop an sub-area specific plan! NWPP has a plan! Desert Southwest has a plan

! Goal of the coordinated plan is to arrest the frequency decline beforefrequency reaches 58.0 Hz & to recover frequency to 59.5 Hz or higher

! Simulation work shows that the coordinated plan will not activate until therehas been a cascading disturbance across multiple entities systems

" In addition, none of the WECCs sub-areas will experience an off-nominal frequency event due to either single or dual most-severe-contingency losses of generation resources if the losses occur withinknown island configurations

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! The IFRO is divided amount the Interconnections BA using the followingformula:

! Annual Gen BA" The annual MWH output of generating plants within BA Area

! Annual Load BA" The annual MWH load within BA Area

! Annual Gen INT" The sum of MWH Gen BA values in Interconnection

! Annual Load INT" The sum of MWH Load BA values in Interconnection

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power system dynamics part 1-manual

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