Introduction to Electric Power Systems

This course deals with all that material that is necessary to create the model of an electric power system from the composition of models of individual components. As a consequence, the behavior of the system in the permanent mode can be estimated. During the development of models of the various components necessary information about the system mode are given.

Objectives

Targets of the lesson: Understanding the operation of the basic components of an electric power system such as: power transformer, synchronous machine and transmission lines. To create the models that describe the behavior of the above components in sinusoidal steady state To create the whole system model To present the basic knowledge that is necessary to estimate the behavior of an electric power system in both operation modes, sinusoidal steady and transition state

Prerequisites

There ane no prerequisite courses

Syllabus

History of Electric Power Systems. Basic operations, structure and representation of Electric Power Systems. The Greek (Hellenic) Electric Power System. Sinusoidal steady state circuit analysis, balanced three-phase networks, per phase analysis. The concepts of active, reactive and complex power. Per unit system. Conventional and unconventional electric power sources: steam-electric power station, hydropower station, gas power station, combined cycle gas power station, magneto-hydrodynamic generation, nuclear power station, unconventional (renewable) power sources. The synchronous machine: principle of operation, construction characteristics, induction parameters, voltage equations, Park transformation, circuit model, power relations, operating limits. Power transformer: formation of the transformers, equivalent circuits of a single phase two winding transformer, three-phase transformers, multiwinding transformers, autotransformers. The transformer as a device for controlling the voltage and the flow of active and reactive power. Transmission line parameters: resistance, inductance, capacitance. Representation and performance of transmission lines. Short-, medium- and long-length transmission lines. Lines with distributed parameters. Equivalent circuits of lines. Power-flow through transmission lines, power circle diagrams. Transmission lines loadability. Voltage regulation of transmission lines, shunt compensation. Direct-current power transmission. System model: single-phase equivalent, one line diagram. Elements of power system analysis: load flow analysis, fault analysis, stability analysis, voltage instability, economic operation.