
Dynamic Processes in Power Systems
o Time scales of dynamic phenomena in power
systems
o State space representation of power system:
DifferentialAlgebraicEquation (DAE) model
o Power system dynamic simulation
o Different Types of Simulation and Requirements
for Accuracy
o Simulation work and required modelling
accuracy o Different types of simulation


Introduction to Stability o Fundamentals of
Power System Stability
o Frequency stability
o Voltage stability
o Rotor angle stability 

Models for Dynamic Power System Analysis
o Synchronous generators
o Induction generators
o Dynamic loads o Excitation systems
o Turbine and governing systems


Direct Approach to Rotor Angle Stability: The
OneMachine Problem
o Problem formulation
o Definition of stable and unstable equilibrium
points
o Equal area criterion for transient stability
analysis
o Small signal rotor angle stability (eigenvalues)


Handling of Time Domain Simulations –Stability
function in PF 

RMS (Stability) vs. EMTSimulations


Initialisation 

Event Definition 

Result Visualisation, Plots 

Exercises 2: 

Rotor angle stability under large disturbances


Modelling a onemachine system with PowerFactory


Entering the network data 

Entering machine data 

Determination of critical fault clearing times
V. Dynamic Modelling with PowerFactory


Introduction to DSL (DIgSILENT Simulation
Language)
o Frames and Composite Models
o Block Diagram and Common Models
o State Equations o Basic Modelling Blocks
(Integrator, LeadLag, nonwindup and windup
limiters, etc.)
o DSL overview
o The standard DSLmacro library
o Drawing block diagrams with PowerFactory


Exercise 3+4: 

Simple Excitation System 

Entering the block diagram of a simple, static
excitation system 

Calculation of Initial Conditions
o Heuristic approach for model initialisation
o Application to Exercise 3
o Systematic approach for model initialisation


Exercise 5: 

Excitation System (AVR and PSS)


Modelling of AVR and PSS in the
onemachinesystem 

Results of timedomain simulations VI. Modelling
of Wind Generation 

Wind Turbines – Basic Principles and Generator
Concepts
o Generating Electrical Power from Mechanical
Power
o Energy conversion systems
o Wind energy conversion, Betz law etc.
o Wind turbine components
o Status of technology 

Basic of Wind Energy 

Generator concepts in PowerFactory
o Fixed speed induction machine
o Induction generator with variable rotor
resistance
o Doubly fed induction generator
o Wind generator with fully rated converter


Reduced Order Model for Wind Turbines Modelling
o Model of a Constantspeed Wind Turbine

Model structure and considerations


Rotor model 

Shaft model 

Generator model 


DSL Implementation of ConstantSpeed Wind
Turbine
o Aerodynamic, Mechanical and Electric systems:

Frames and Composite Models


Block Diagram and Common Models



Exercise 6: 

Simple ConstantSpeed Wind Turbine


Entering the block diagram of a ConstantSpeed
Wind Turbine 

Exercise 7: 

Calculating the initial conditions of a
ConstantSpeed Wind Turbine 

Exercise 8: 

Results of timedomain simulations: Dynamic
behaviour of wind turbines technologies during
shortcircuit events 