Field-circuit analysis and measurements of a single-phase self-excited induction generator

Abstract

Abstract:The paper deals with a single-phase induction machine operating as a stand-alone self-excited singlephase induction generator for generation of electrical energy from renewable energy sources. By changing number of turns and size of wires in the auxiliary stator winding, an improvement of performance characteristics of the generator were obtained as regards no-load and load voltage of the stator windings as well as stator winding currents of the generator. Field-circuit simulation models of the generator were developed using Flux2D software package for the generator with shunt capacitor in the main stator winding. The obtained results have been validated experimentally at the laboratory setup using the single-phase capacitor induction motor of 1.1 kW rated power and 230 V voltage as a base model of the generator.

Comparative analysis of single-phase self-excited induction generators of various rotor cages

“…in air, iron core and shaft characteristic was approximated on the basis of no-load test of the induction machine. The block diagram of laboratory set-up for measuring output characteristics of the generator was described in the paper [3]. The generator configuration for excitation (30 μF) and shunt (15 μF) capacitors operating under resistive load has been analysed, of which electric circuit diagram is presented in Fig.…”

“…It was assumed for the analysis that the capacitances are constant. By connecting a shunt capacitor C sh to the main stator winding, the self-excitation is partially shifted to that stator winding and thereby the auxiliary winding current of the generator may be reduced [3].…”

“…For production of low-power single-phase electrical energy, self-excited induction generators (SP-SEIGs) driven by a micro-hydro or micro-wind turbine may be applied. Usually, for single-phase power generation as an auxiliary energy source at household, single phase of two separate stator windings' induction machines of power up to 3 kW will be sufficient operating as an autonomous single-phase selfexcited induction generator [1][2][3][4][5][6]. When larger electrical power is needed, a three-phase stator winding self-excited induction generator with single-phase output should be employed for feeding single-phase loads [7][8][9].…”

“…Theoretically, any induction machine designed for motor operation may be directly utilized as induction generator, but its performance will be not satisfactory since, for example, problems with self-excitation of the generator may be occurred and terminal voltage regulation as well as the maximum output power at desired speed of rotation will be not sufficient. To obtain satisfactory performance of the induction generator, some reconstruction of stator windings [3,5], rotor cage and magnetic core are necessary to improve the performance characteristics of the generator. Multiple papers have been reported on the use of copper squirrel rotor cage in induction motors [10][11][12], but only a few dealt with induction machines operating as self-excited induction generators [13,14].…”

Autonomous Machine Learning Algorithm for Stress Monitoring in Concrete Using Elastoacoustical Effect

“…The SAS system utilises the self-excitation effect. However, it is rarely desirable due to the possibility of destroying the component being tested, but sometimes used in nanoscale measurement systems [ 26 , 27 , 28 ]. This system has been successfully applied in civil engineering [ 29 , 30 ], measurement of metallic structures [ 31 , 32 ], mining [ 33 ], ceramic, and concrete structures [ 34 , 35 , 36 , 37 ].…”