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Vol. 20 (2017 year), No. 4, DOI: 10.21443/1560-9278-2017-20-4

Hasanova L. H., Mustafayev R. I.
A research technique for the effect of higher harmonic voltages on the operating parameters of a permanent magnet synchronous generator

Nowadays permanent magnet synchronous machines those frequency-controlled from stator side with frequency inverters made on the basis of power transistors or fully controlled thyristors, are widely used as motors and generators. In future they are also promising a good application in transport, including marine. Modern frequency inverters are equipped with a control system based on sine-shaped pulse width modulation. While shaping the voltage in the output of the inverter, in addition to the fundamental harmonic, higher harmonic components are also included in the voltage shape, which certainly affect the operating parameters of the generator (electromagnetic torque, power, currents). To determine this effect the modeling and investigation technique of higher harmonic voltages in the "electric network – frequency converter – synchronous machine with permanent magnets" system has been developed. The proposed equations of a frequency-controlled permanent magnet synchronous machine allow relatively simply reproduce the harmonic composition of the voltage in the output of a frequency inverter equipped with the control system based on a sinusoidal pulse width modulation. The developed research technique can be used for inverters with any number and composition of voltage harmonic components feeding a stator winding of a permanent magnet synchronous machine. On a particular case, the efficiency of the research technique of the higher harmonics influence on the operating parameters of the generator has been demonstrated. At the same time, the study has been carried out taking into account the shape of the voltage curve feeding the windings of the synchronous machine containing in addition to the fundamental harmonic the 8, 10, 11, 13, 14 and 16-th harmonic components, and the rated active power of the synchronous machine has been equal to 1 500 kW.

(in English, стр.9, fig. 4, tables. 0, ref 5, Adobe PDF, Adobe PDF 0 Kb)

Vol. 22 (2019 year), No. 4, DOI: 10.21443/1560-9278-2019-22-4

Hasanova L. H.
Harmonic filtering of frequency controlled asynchronous double fed machines

Frequency-controlled asynchronous double fed machines are widely used both as motors and as generators. They are especially widely used in renewable energy sources as generators for wind power devices and installations of small hydroelectric power stations. In recent years, they have been actively introduced into marine generator sets. One of the main methods for studying their operation modes is mathematical modeling. Frequency converters supplying the rotor winding of a dual-power machine use power transistors or fully controllable power thyristors. Modern circuits of these converters controlled on the basis of sinusoidal pulse-width modulation do not allow to get rid of the harmonic components arising in the output voltage curve. In the process of studying the operating modes of frequency-controlled asynchronous double fed machines, a device for suppressing harmonic components in the output voltage curve has been considered. A mathematical model has been developed for the frequency-controlled double fed machine from the rotor taking into account the harmonic composition of the output voltage of the frequency converter and the batteries of static capacitors in the rotor circuit; the filtering modes of the harmonic components of the output voltage of the frequency converter have been studied using the simplest filter – a static capacitor battery. Placing these batteries at the output of the frequency converter can significantly reduce the harmonic components in the curves of rotor currents, and hence in the whole machine. Thus, the developed modeling scheme and the results of the study have demonstrated the effectiveness of using a filter consisting of static capacitors.

(in Russian, стр.5, fig. 2, tables. 0, ref 6, AdobePDF, AdobePDF 0 Kb)