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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

7/30/2019 Seminar1b

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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