SeriesCapacitorsPresentationSPCCompatibilityMode.pdf - BPA Series Capacitors Purpose Design Application Performance Presented By Mike Hulse Series

SeriesCapacitorsPresentationSPCCompatibilityMode.pdf - BPA...

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BPA Series Capacitors Purpose, Design, Application & Performance Presented By Mike Hulse
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Series Capacitor Purpose •Increase Transfer Capability –In lieu of constructing a new line and –At a significantly lower cost •Improves Steady State & Transient Stability –By reducing the lines inductive reactance and –Transmission phase angle •Reduces System Losses –By reducing sub-transmission power flow •Improves Load Division Between Circuits –By balancing the impedance of parallel circuits •Optimize Power Transfer –Adjusting impedance/line thermal capability relationship
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Types Of Reactive Power Compensation Series Compensation •Cost is much lower than building a new transmission circuit •Improved stability by reducing the transmission phase angle •Reduced line inductive reactance •Reduced system losses •Provides desired load division between circuits. •Increases short circuit currents •Increases line-to-ground voltages adjacent to bank •Distance relays my trip for external faults - overreach •Can create or amplify generator sub-synchronous resonance Source Line Load L R L 1 L 2 L 3 Substation Series Capacitor
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Types Of Reactive Power Compensation Shunt Capacitors •Provides power factor correction •Improves power system stability with high-speed switching. •Increases the bus voltage when inserted •Act as a surge protective device for impulses •Little impact on short circuit currents but does contribute an out rush component •Voltage can be high after load rejection Source Line Load L L 1 L 2 L 3 Shunt Capacitor
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Types Of Reactive Power Compensation Shunt Reactor •Controls operating voltages by absorbing charging current from lightly loaded lines •Avoids the security and stability impacts of removing lines from service •Improves power system stability with high-speed switching. •Voltage is low after load rejection Source Line Load L R L 1 L 2 L 3 Substation Shunt Reactor
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Types Of Reactive Power Compensation Static VAR Compensator (SVC) •Stabilizes bus voltage •Provides dynamic control of reactive power flow •Increases transmission capacity •Improves power system stability, power quality and damping of SSR. •Expensive but effective Source Line Load L R L 1 L 2 L 3 Filters SVC
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Types Of Reactive Power Compensation Thyristor Controlled Series Capacitor (TCSC) •Provides dynamic control of reactive compensation •Improves system stability •Damps power system swings. •Reduces system loses •Controls SSR Source Line Load L R L 1 L 2 L 3 Substation TCSC
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Series Capacitor Design Major Bank Components •Capacitors –Individual fuseless, external or internal fused units in racks •Metal Oxide Varistor –Non-linear resistor elements in porcelain or non-ceramic housings •Bypass Gap (Optional Depending on Bank Location and MOV Costs) Triggered and/or self-triggered electrodes in an enclosure •Current Limiting Reactor –Air core multiple package fiberglass epoxy reinforced inductor •Damping Resistor
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