CN101986515A - Megawatt double-fed wind driven generator rotor concentric type un-equal turn hexaphase alternating current (AC) winding - Google Patents

Abstract

The invention relates to a megawatt double-fed wind driven generator rotor concentric type un-equal turn hexaphase alternating current (AC) winding. The winding has 60 rotor slots, 4 poles and 6 phases. In the hexaphase winding, two stars are separated from each other at an electrical angle of 30 DEG, namely, a three phase star winding of which the space distribution is 60 DEG phase belts is divided into two 30 DEG phase belt star windings with a space electrical degree difference of 30 DEG. Ends A 10, B 10, C 10, A 20, B 20 and C 20 of windings are connected to form a common point O and are not led out, and the other ends A1, B1, C1, A 2, B2 and C2 of windings are led out respectively; and meanwhile, the A2, the B2 and the C2 are displaced at an electrical angle of 30 DEG from the A1, B1 and C1. The utilization rate of the winding is improved by 16.2 percent than that of the conventional wave winding, the magnetic potential harmonic wave is reduced by 55.3 percent, the quality of power generation is improved, the temperature increasing is reduced, the efficiency is improved, and the economy and the reliability are improved.

Description

MW class double-fed wind power generator rotor concentric type unequal-turn six cross streams windings

Technical field

The present invention relates to a kind of power equipment, especially a kind of rotor concentric type unequal-turn six cross streams windings of MW class double-fed wind power generator.

Background technology

Existing 1.5 MW class double-fed wind power generator rotors, 60 grooves, 4 utmost points, 3 phases, the rotor design of Windings becomes wave winding, has following shortcoming:

The existence of 1 empty groove makes winding coefficient low, has wasted lead, and is uneconomical;

2 mmf waves are poor, and the rotor magnetic potential waveform contains abundant harmonic wave, and loss is big, and heating is serious, temperature rise, and generator poor quality;

3 inverter capacity need nargin big, and are uneconomical, and easily are damaged;

4 rotor slot shapes are open slot, and slot ripples is serious;

Above-mentioned shortcoming is demanded urgently improving, and the present invention improves design from rotor winding new construction aspect.

Summary of the invention

Purpose of the present invention designs the double-deck two Y of a kind of rotor concentric type unequal-turn exactly and moves 30 ° of six cross streams winding, fundamental wave winding coefficient improves, and the harmonics of magnetic force that forms significantly reduces, make rotor magnetic potential waveform height sineization,, reduce heating to reduce harmonic loss, reduce temperature rise, improve the generating quality and raise the efficiency, the capacity of supporting inverter is reduced, improve reliability and economy.

Technical scheme: a kind of MW class double-fed wind power generator rotor concentric type unequal-turn six cross streams windings, several 60 grooves of rotor, number of poles 4 utmost points, the number of phases 6 phases, this 6 phase windings move 30 ° of electrical degree three-phase star windings mutually by two and form (the rotor design of Windings becomes two Y to move 30 ° of six cross streams winding), wherein:

First three-phase star winding A1A10, B1B10, C1C10 are a kind of concentric type single layer winding, and two kinds of pitches are arranged, first kind of pitch is 14, every circle 5 circles, second kind of pitch is 12, every circle 2 circles, the coil number of every kind of pitch is identical, every phase 8 circles, three-phase 24 circles;

Second three-phase star winding A2A20, B2B20, C2C20 is a kind of concentric type list two layer winding, and two kinds of pitches are also arranged, first kind of pitch is 15, every circle 3 circles, second kind of pitch is 13, every circle 5 circles, the coil number of every kind of pitch is identical, every phase 8 circles, three-phase 24 circles;

One end A10 of each winding, B10, C10, A20, B20, C20 are connected into common point O point, do not draw, the other end A1 of each winding, B1, C1, A2, B2, C2 draws respectively; A2 simultaneously, B2, C2 respectively with A1, B1,30 ° of electrical degrees of C1 displacement.

Particularly, the rotor design of Windings becomes two Y to move 30 ° of six cross streams winding, also promptly six phase double stars move the winding of 30 ° of electrical degrees mutually, are to be that the three-phase star winding of 60 ° of facies tracts is divided into two 30 ° facies tract star windings with spatial distribution, and 30 ° of electrical degrees of space mutual deviation.The harmonics of magnetic force number of times that each star of the layout of this six phase winding produces is V=6K ± 1(K=0,1,2,), wherein during K=0, promptly V=1 is the first-harmonic basically identical that two stars produce, and K is when being odd number, also be 5,7 ... two stars of inferior harmonic wave are subtracted each other, so make 5 substantially, 7 ... very little Deng subharmonic; For K=2,4 ... during for even number, also be 11,13,23,25 ... Deng two stars of subharmonic are additions, in order to eliminate K=2,4, during even number also 11,13,23,25, Deng harmonic wave, should make this kind subharmonic in each star minimum, the magnetic potential that such two star windings form is just with 5,7,11,13,17,19,23,25 ... wait all harmonic waves all greatly to weaken, also promptly the mmf wave that forms of two stars be exactly highly sine changed.This has just reached the purpose of invention.

Beneficial effect of the present invention: fundamental wave winding coefficient improves, and the harmonics of magnetic force that forms significantly reduces, make rotor magnetic potential waveform height sineization, to reduce harmonic loss, the minimizing heating reduces temperature rise, improves the generating quality and raises the efficiency, the capacity of supporting inverter is reduced, improve reliability and economy.Winding scheme of the present invention makes the utilance of winding improve 16.2% than conventional wave winding, and the harmonics of magnetic force reduces 55.3%, and the generating quality improves, and temperature rise reduces, and efficient improves, and economy and reliability also all increase.

Description of drawings

Fig. 1 is first star Three-phase Single-layer Windings layout plan of the present invention;

Fig. 2 is second star three-phase list two layer winding layout plan of the present invention;

Fig. 3 moves six phase winding layout plans of 30 ° of electrical degrees for double star of the present invention.

Embodiment

Embodiment one: referring to Fig. 1, Fig. 2, Fig. 3, with one 4 utmost point 1.5MW of MW class double-fed wind power generator rotor concentric type unequal-turn six cross streams winding application implementations of the present invention double-fed wind power generator, several 60 grooves of rotor, every extremely every phase groove is counted q=5, and six phase double stars move the winding construction of 30 ° of electrical degrees mutually.

Fig. 1 is first star Three-phase Single-layer Windings A1, B1, and C1 winding layout plan, by A1A10, B1B10, C1C10 constitutes, and the A1A10 winding in three phase windings is called the A1 phase winding, and this winding is a kind of single layer winding, and two kinds of pitches are arranged, and first kind of pitch is 14, is 2-

31-

32-

1-

Second kind of pitch is 12, is 3-

30-

33-

60-

Every totally 4 circles mutually of first kind of winding, every circle 5 circles, second kind of every phase of winding also is 4 circles, every circle 2 circles; Lead-out wire is labeled as A1A10; In like manner, B1 phase winding mark also is B1B10; The C1 phase winding is labeled as C1C10; B1, the coil number of C1 phase and the number of turn are all mutually identical with A1, A1, B1,120 ° of electrical degrees of C1 three-phase mutual deviation.

Fig. 2 is second star three-phase list two layer winding A2, B2, and C2 winding layout plan is by A2A20, B2B20, C2C20 constitutes, and the A2A20 winding in three phase windings is called the A2 phase winding, this winding is a kind of concentric type list two layer winding, and two kinds of pitches are arranged, and first kind of pitch is 15, i.e. 4-

-34; 34-

-4, every mutually totally 4 the circle, every circle 3 circles; Second kind of pitch is 13, i.e. 5-

33-

35-

3-

, every mutually totally 4 the circle, every circle 5 circles, lead-out wire is labeled as A2A20; In like manner, the B2 phase winding is labeled as B2B20; The C2 phase winding is labeled as C2C20; B2, the coil number of C2 phase and the number of turn are all mutually identical with A2, A2, B2,120 ° of electrical degrees of C2 three-phase mutual deviation.

Fig. 3 is that double star moves 30 ° of electrical degrees, six phase winding layout plans, A1, B1,120 ° of electrical degrees of C1 three-phase mutual deviation, A2, B2,120 ° of electrical degrees of C2 three-phase mutual deviation, A2, B2, C2 respectively with A1, B1,30 ° of electrical degrees of C1 mutual deviation, the A10 of each phase, B10, C10, A20, B20, C20 connect altogether and form mid point O, not drawing, externally is six phase A1, A2, B1, B2, C1, C2 export mutually with six of frequency converter and join, and six phase power supplys of frequency converter supply should adapt therewith.

The six phase double stars of Xing Chenging move the winding of 30 ° of electrical degrees like this, and the harmonics of magnetic force of formation is a sine highly.

As calculated, the harmonics of magnetic force of the present invention only is intrinsic 44.7%, has reached the purpose of invention like this.Change the semi-closed port peariform slot in order to adapt to novel wound rotor flute profile into by the square opening groove, the groove leakage reactance reduces, and slot ripples also alleviates greatly, and the generating quality is significantly improved.Fundamental wave winding coefficient brings up to 0.9788 by original 0.9358, improves 4.6%, and former empty groove occupies 10%, so winding utilization improves 16.2%, economy greatly improves.

Claims (1)

1. MW class double-fed wind power generator rotor concentric type unequal-turn six cross streams windings is characterized in that: several 60 grooves of rotor, and number of poles 4 utmost points, the number of phases 6 phases, this 6 phase windings move 30 ° of electrical degree three-phase star windings mutually by two to be formed, wherein:

First three-phase star winding A1A10, B1B10, C1C10 are a kind of concentric type single layer winding, and two kinds of pitches are arranged, first kind of pitch is 14, every circle 5 circles, second kind of pitch is 12, every circle 2 circles, the coil number of every kind of pitch is identical, every phase 8 circles, three-phase 24 circles;

Second three-phase star winding A2A20, B2B20, C2C20 is a kind of concentric type list two layer winding, and two kinds of pitches are also arranged, first kind of pitch is 15, every circle 3 circles, second kind of pitch is 13, every circle 5 circles, the coil number of every kind of pitch is identical, every phase 8 circles, three-phase 24 circles;

One end A10 of each winding, B10, C10, A20, B20, C20 are connected into common point O point, do not draw, the other end A1 of each winding, B1, C1, A2, B2, C2 draws respectively; A2 simultaneously, B2, C2 respectively with A1, B1,30 ° of electrical degrees of C1 displacement.

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