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Phase 2 Composite Load Model Impact – RS Discussion

Phase 2 Composite Load Model Impact – RS Discussion. From Draft Preliminary white paper dated 10/20/11. Where we are at. Simulations now consider angular stability between generators. Voltage dip to approximate acceptable impact to load busses given static loads.

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Phase 2 Composite Load Model Impact – RS Discussion

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  1. Phase 2 Composite Load Model Impact – RS Discussion From Draft Preliminary white paper dated 10/20/11

  2. Where we are at • Simulations now consider angular stability between generators. Voltage dip to approximate acceptable impact to load busses given static loads. • MVWG recommending to consider load behavior in Voltage Dip Criteria (FIDVR). • Composite load modeling effort under way, this applies to Phase 2 of that effort.

  3. Voltage Swing versus FIDVR

  4. Main Objectives • TPL-001-2 does not permit non-consequential load loss for range of contingencies. • Minimize risk of disturbance cascading due to unexpected control or protection action. • Ensure no unsafe over-voltages in the transmission and distribution systems due to loss of load during the event.

  5. Modeling Challenges • Phase 2 – Residential air conditioner stalling. • Fault details – Point-on-wave dependence, 1-phase faults can result in FIDVR, simulation models positive sequence equivalent. • Uncertainties in load model composition

  6. Power System Issues • Power plant ride-thru • Power plant reactive limits (OEL, UEL) • Static VAR systems (over/under voltage control) • HVDC system behavior • Switched shunt caps and reactors (voltage supervision) • Protective relaying (zone protection)

  7. Basic Proposal • Define voltage dip as margin above tolerance curves, ITIC, gen ride-thru. • Measure at bus where model is represented, e.g. load bus, generator bus. • Consider impact to zone 2 relays in studies.

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