• This module provides a foundation course on the most important ac electrical machinesand most important power electronic conversion circuits for those students who are majoring in Electric Power.
• The aim of this module is to understand the operation and behaviour of ac machinesand power electronic semiconductor devices, and explain and describe the use of power electronic machine drives.
• On completion of this module, the learner will be able to
• Derive the equivalent circuit of a synchronous machinefrom known machine tests.
• Be able to synchronise a synchronous machine to a grid network.
• Derive the equivalent circuit of an induction machine from known machine tests.
• Analyse behaviour of induction machineunder load conditions.
• Understand the implementation of passive and static power factor correction.
• Describe the use of inverters in variable speed induction motor drives. To explain the torque speed capability of an induction motor with a variable frequency variable voltage inverter.
• The ability to undertake laboratory experiments on the material of the course, to record and analyse the results of these experiments and to present the outcomes in technical reports.
• Synchronous Machines
• Construction and description of operation, salient-pole and cylindrical-rotor types. Derivation of equivalent circuit from open-circuit and short circuit tests, synchronous reactance, the phasor diagram (of cylindrical-rotor machine) and the Power Angle Curve. Synchronising to an infinite busbar. Steady state stability limit.
• Three-Phase Induction Machines
• Production of rotating field, and description and operation of machine. Construction. Derivation of equivalent circuit, determination of torque speed characteristic. Locked-rotor and no-load tests. Induction generator. Introduction to V/F control. Starting methods and protection.
• Power Factor Correction
• Need for power factor correction. Single-phase and three-phase power factor correction. Utility and consumer power factor correction. Active power factor correction and filters.
• Variable Speed Drive: Fixed frequency induction motor torque speed characteristic, V/F operation, Torque Speed capability with v/f drive, Typical V/F drive circuit diagram
• Induction machine – development of equivalent circuit
• Torque/speed characteristics of an induction machine
• Synchronous machine characteristics-equivalent circuit of a synchronous machine
• Synchronising a synchronous machine to an infinite bus
• Sine PWM Inverter in Spice
• DC Drive Simulator
• AC Drive Simulator
P.C. Sen, 1997, Wiley, Principles of Electric Machines and Power Electronics