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  • 7/30/2019 Seminar1b

    1/3

    Power System Stability Summer 2000

    Olof Samuelsson

    Component modeling

    This level of detail can be handled also for large systems. For specific phenomena more detail

    should be added, at least locally.

    Conceptual level what the different parameters represent

    Power System Structure

    Power plant step up transformer line substation(s) and transformer(s) cable load

    Power plant structure

    M Fig. 2.2, energy and information flows, ABB PowerFormer differences

    Behavior of auxiliary equipment and its protection important during disturbances

    Lines and cables

    3.1, Distributed parameters

    Pi-equivalent circuits for long lines, medium-length and short lines

    Cables

    SIL

    Transformer

    3.2, T-equivalent circuit

    LTC, phase shifting transformer, complex turns ratio

    Load

    3.4, Individual loads

    Aggregation, equivalent or composite loads

    Characteristics voltage and frequency dependence

    ZIP (3.100), exponential

    Dynamic with recovery

    Model parameters Table 3.3

    LOADSYN

  • 7/30/2019 Seminar1b

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    Power System Stability Summer 2000

    Olof Samuelsson

    Turbines

    M 2.2.3, 10.3

    Steam turbine Fig 2.6

    Gas turbine Fig 2.7

    Combine Cycle Gas Turbine, Fig 2.8

    Hydro turbine, Fig 2.9, Francis wicket gates, Kaplan wicket gates + runner blades, Pelton

    Synchronous Generator

    1) M 2.2.1 Turbo in thermal plants, round rotor, few pole pairs (shaft speed in rpm @ 50

    Hz = 3000/# of pole pairs), small diameter and long shaft, Fig 3.11

    Salient pole generators in hydro power plants, many pole pairs, large diameter

    and short shaft, Fig 3.13

    2) M 3.3 Steady state operation, vector and phasor diagram, torque generation Figs 3.9,

    3.11, 3.12

    Angle identities

    Salient pole rotor, Figs 3.13, 3.14, 3.15, 3.16

    3) Power, (3.88), - synchronous generator controllable source of reactive power,Fig 3.19, under/over excitation

    Capability diagram, Pm/Ia/If limits

    4) M 10.1 Dynamic models, Fig 10.1 and (10.1) + torque equation + swing equation

    Damper/amortisseur windings in the rotor gives eddy currents that oppose

    rotor field changes

    dq reference frame, Fig 10.2, (10.17-19)

    Subtransient, transient, steady state, Fig 4.18, new parameters

    5) Model resolution, models 6 to 2, when to use which one?

    Generator controls

    M 2.2.2, 10.2, AVR, impact on power-angle curve Figs 5.21, 5.22

    Analyze a EUROSTAG IEEE exciter model block diagram

    Governor, Figs 2.12, 2.13, 2.14, droop

    Governor modeling Fig 10.22

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    Power System Stability Summer 2000

    Olof Samuelsson

    Non-minimum phase behavior of hydro turbine, Fig 10.26

    PSS

    M Fig. 2.4, energy and information flows