seminar1b
TRANSCRIPT
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7/30/2019 Seminar1b
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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
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7/30/2019 Seminar1b
2/3
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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7/30/2019 Seminar1b
3/3
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