Course: 2020/2021

Electric power systems

(13985)

Students are expected to have completed

- Electrical Power Egineering Fundamentals
- Magnetic Circuits and Transformers
- Transmission Lines and Electrical Equipment

Competences and skills that will be acquired and learning results. Further information on this link

The student will be able of analysing electric power systems in steady-state conditions, using using basic tools as per-unit quantities and load flow
algorithms, and also under fault conditions (symmetrical and unsymmetrical).
The student will acquire basic knowledge about the transient stability problem and the capability to analyse the transient stability in simple cases. The student will acquire basic skills in using commercial software for power system analysis.

Description of contents: programme

1. Introduction to the electric power systems.
- Structure of a power system.
- Per-unit quantities.
2. Load flow studies.
- Problem description. Buses types.
- The Newton-Raphson method.
- Decoupled methods: Fast decoupled method and DC power flow.
- Control of power into a network.
3. Symmetrical three-phase faults.
- Transients in RL series circuits.
- Short-circuit power.
- Short-circuit currents and the reactances of synchronous machines.
- Internal voltages of loaded machines under transient conditions.
- The Bus Impedance Matrix in fault calculations.
4. Symmetrical components.
- The symmetrical components of unsymmetrical phasors.
- Symmetrical components of phase and line currents and voltages.
- Power in terms of symmetrical components.
- Sequence impedances and sequence networks.
5. Unsymmetrical faults.
- Unsymmetrical faults in power systems.
- Interconnection of Sequence networks in a single line-to-ground fault.
- Interconnection of Sequence networks in a double line-to-ground fault.
- Interconnection of Sequence networks in a line-to-line fault.
- Analysis of unsymmetrical faults using the bus impedance matrix.
6. Power system transient stability.
- The stability problem. Transient stability studies.
- The swing equation.
- The power-angle equation.
- Equal-area criterion of stability.
- Factors affecting transient stability
Computer sessions:
1. Power flow study within PSS/E.
2. Power flow control within PSS/E.
3. Symmetrical and unsymmetrical faults analysis within PSS/E.

Learning activities and methodology

- Magisterial classes, tutorship and personal work oriented to the acquisition of theoretical knowledge. (3 ECTS credits)
- Problems solution classes, laboratory sessions, tutorship and personal work (problems and self-assesment quizzes) oriented to the acquisition of practical skills. (3 ECTS credits)
Additionally, collective tutorship can be included in the programme.

Assessment System

- % end-of-term-examination 0
- % of continuous assessment (assigments, laboratory, practicals...) 100

Basic Bibliography

- Elgerd, O.I.. Electric energy systems theory: an introduction. McGraw-Hill. 1982
- Stevenson, W.D.. Elements of Power System Analysis. McGraw-Hill. 1982

- Ramana, N.V. · Power System Analysis : http://proquest.safaribooksonline.com/book/electrical-engineering/9788131755921

Additional Bibliography

- Gómez Expósito, A.. Electric energy systems : analysis and operation . CRC Press. 2009
- Kundur, P.. Power System Stability and Control. McGraw-Hill. 1994

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