
Course unit
ELECTRIC POWER SYSTEMS
IN04107616, A.A. 2019/20
Information concerning the students who enrolled in A.Y. 2019/20
ECTS: details
Type 
ScientificDisciplinary Sector 
Credits allocated 
Core courses 
INGIND/33 
Electrical Energy Systems 
9.0 
Course unit organization
Period 
Second semester 
Year 
1st Year 
Teaching method 
frontal 
Type of hours 
Credits 
Teaching hours 
Hours of Individual study 
Shifts 
Lecture 
9.0 
72 
153.0 
No turn 
Examination board
Board 
From 
To 
Members of the board 
11 A.A. 2018/19 
01/10/2018 
30/11/2019 
CALDON
ROBERTO
(Presidente)
TURRI
ROBERTO
(Membro Effettivo)
BENATO
ROBERTO
(Supplente)

Prerequisites:

Basic knowledge of electrical systems, electrical machines and automatic controls is required. 
Target skills and knowledge:

The course aims to teach the following knowledge:
1) the knowledge bases of the establishment and operation of a large electrical system.
2) the main methods of analysis of linear networks meshed in steady state, such as the calculation of loadflow.
3) The methods of regulation of voltage and frequency and the determination of the response of a system by mean the relative transfer functions.
4) The main methods for assessing the system stability in a perturbed dynamic regime.
5) Overvoltage evaluation methods on transmission lines, with and without the guard wire, following lightning events.
The expected skills are as follows:
i) ability to calculate currents and voltages along lines represented with distributed electrical parameters.
ii) Ability to derive the node admittances matrix of linear and passive networks, however complex.
iii) Ability to calculate power flows in meshed networks of any extension and complexity.
iv) Ability to calculate the power generated by alternators connected to the grid in a dynamic regime. 
Examination methods:

Oral examination and written reports of laboratory exercises 
Assessment criteria:

The evaluation of the oral test will take place with reference to the degree of knowledge of the subject shown by the candidate, on the understanding of the topics developed and on the acquisition of the proposed concepts and methodologies. The ability to display with appropriate terms and logical steps the meaning of phenomena and of the technologies studied will also be considered.
The evaluation of the reports produced during the computer lab will have a positive weight in the final evaluation if the student is able to justify the numerical choices and the results obtained for the various exercises. 
Course unit contents:

 General information on electrical systems and their historical evolution.
 Recalls on the theory of passive and linear twoports and conventions for the application to the Electrical Systems (series, parallel, degenerate, T and Pigreco equivalent).
 The constant characteristics of threephase lines  Propagation on transmission lines  progressive wave  regressive wave  Wavelength  phase velocity  constant attenuation.
 Natural power operation of transmission lines.  Lines of infinite length;  Line with no load;  Elliptical voltage diagrams of the ideal line.  The circular diagrams of incoming powers.
 The method perunit in the study of electrical networks.  Application to a network with multiple voltage levels.  Networks with nonzero group transformers.
 The matrix of nodal admittance (or impedance) in the study of networks.
 Calculation of power flows in meshed networks.  Formulation of the problem. Calculation of power flows using the GlimmStagg method and the NewtonRaphson method.  Application examples.
 Approximate methods for the calculation of power flows.  Decoupled LoadFlow.  DC Method.
 Voltage control in an electrical system. Measures for voltage regulation.  Synchronous compensators,  Capacitors,  Under load Tap changers,  Voltage collapse.
 Frequency control.  Generator transfer function with tacoaccelerometric governor.  Static characteristics of a generation group.  The power balance in a dynamic state. The primary control of a GeneratorLoad system.
 Primary and secondary regulation in an electrical system  Primary and secondary control in a system with more generators.
 The FrequencyPower exchange control in two interconnected systems.  The Darrieus equations.  Autonomy of areas. Quazza's criterion for the autonomy of secondary control.
 Organization of secondary control in the national system. Use of booster transformers.
 System stability  Steadystate stability.
 Series compensation of transmission lines for stability improvement.
 Synchronous machine, connected to the network, in transient state.  Power supplied by a synchronous machine in a transient state
 The transient stability equation of a synchronous machine connected to the network.  The areas criterion for the study of stability.
 The simplified model of synchronous machine. the influence of the various types of outages on stability.  The use of the quickclosing switches for parallel stability.  Study of small disturbances on rotor oscillations.
 Propagation of traveling waves: physical models.  Reflection and transmission coefficients.  Multiple reflection on lines of finite length.
 Study of overvoltages due to external origin.  Lightning of lines with and without guard wire.
 Distance protection of lines: The distance relay. 
Planned learning activities and teaching methods:

The course consists of lectures. The topics of the teaching program and some examples of the theoretical concepts illustrated are presented in the classroom. There are also 10 exercises (20 hours) in the laboratory where the student, by applying appropriate calculation and simulation tools, studies the behavior of particular cases of electrical systems. 
Additional notes about suggested reading:

Teaching materials are the texts and reference handouts indicated. Additional teaching materials and laboratory exercises are also available on Bacheche DEI  Moodle. 
Textbooks (and optional supplementary readings) 

Paolucci, Antonio, Lezioni di trasmissione dell'energia elettrica. Padova: Cleup, 1998.

Sustainable Development Goals (SDGs)

