CN1305208C

CN1305208C - Brushless three-phase synchronous generator with multiwave mixed exitation and internal source filtering

Info

Publication number: CN1305208C
Application number: CNB021156190A
Authority: CN
Inventors: 林政安
Original assignee: Tellhow Sci Tech Co Ltd
Current assignee: Tellhow Sci Tech Co Ltd
Priority date: 2002-03-20
Filing date: 2002-03-20
Publication date: 2007-03-14
Anticipated expiration: 2022-03-20
Also published as: CN1445909A

Abstract

The invention discloses a multi-wave excitation internal source filter brushless three-phase synchronous generator, which is characterized in that the generator is coaxially composed of an AC exciter. The generator stator consists of two types of three-phase symmetrical windings. One is the main winding, which is a single or double-layer equal-turn sinusoidal winding; the other is the auxiliary winding, which is a multi-wave winding and also has an equal-turn structure. The main winding and the auxiliary winding are connected in series, and the three-phase taps are at the junction. This auxiliary winding not only plays the role of multi-wave mixed excitation, but also plays the role of active filtering, which is also the role of spatial filtering and time filtering. When the generator rotor has a hidden pole structure, the excitation winding is a multi-pole compound type. The generator has an automatic voltage regulator (AVR). This generator outputs a three-phase symmetrical sine wave voltage to the outside. The total harmonic content of the voltage is less than 1%. It is self-excited and self-stabilized, adapting to various modern electrical loads, running without oscillation, and running stably.

Description

Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator

Technical field

The present invention relates to a kind of brushless three-phase synchronous generator, especially a kind of Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator.

Background technology

As everyone knows, the brushless three-phase synchronous generator of band AC exciter, known mainly contains three kinds, and a kind of is the band pilot exciter, and pilot exciter has magneto and inductor type.This motor is made up of three motor coaxles, and high-quality brushless three-phase generator belongs to this kind more.Its shortcoming is big, the axial length of volume, the excitation energy is restricted or waste; A kind of is AC exciter, and field power supply is supplied with by the main frame fundamental voltage, its bad dynamic performance, be subject to disturb, power controlling is big, voltage quality is not high; A kind of is that the AC exciter power supply is to be supplied with by main frame triple-frequency harmonics winding, its dynamic property is good, electric best in quality, but under low power factor load, nonlinear load, rectification load, frequent starting load condition, reforming phenomena may appear easily, voltage-form distortion rate can reach about 2%, improving, it is very big with interior difficulty to improve total harmonic distortion to 1%, is necessary to break through above-mentioned difficult point, and its electric quality is further improved.Can make the adaptive load ability wider.The problem of above-mentioned existence is extremely to be solved, so that satisfy every strict demand of modern electrical load.

Summary of the invention

The object of the present invention is to provide a kind of Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator, all kinds of brushless three-phase synchronous generators that make its aggregate level be better than appearing on the market at present, and make the voltage waveform total harmonic distortion in 1%, satisfying the high-quality user's of modern loads requirement, and manufacture difficulty can decrease.

Technical scheme of the present invention is: contain two groups of three-phase symmetric windings in the stator winding of this Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator, one group is that main winding is single, double layer three a symmetrical positive chorded winding, is to wait circle not equidistant; One group is that auxiliary winding is three symmetrical to wait circle not equidistant, and effect is as many ripples composite excitation source winding, is again endogenous Filter Winding simultaneously; The turn ratio that these two groups of windings are each coil of main winding and auxiliary winding is 2: 1.Two groups of windings are that main winding is connected with auxiliary winding method of attachment in the stator winding of generator, continuous some tap output of two kinds of windings connects three phase half wave rectification bridge, rectification after voltage regulator (AVR) control exciter excitation electric current, and then the voltage accuracy during the various operating mode of stable generator.Rotor is made hidden pole type, and the magnetic field winding is multipole compound winding, and this compound winding is that windings in series or the parallel connection by two kinds of different numbers of poles constitutes.

The invention has the advantages that: many ripples excitation can be utilized multiple harmonic energy intrinsic in the motor fully, so can reduce additive decrementation, raises the efficiency, and reduces volume, weight, saving metal material and energy.Many ripples excitation combines the advantage of multiple harmonic excitation, first-harmonic excitation, permanent excitation, has overcome deficiency separately, and the motor electric property is further improved.The voltage landing is littler when starting asynchronous machine, ability is bigger.Endogenous filtering further promotes the positive chorded winding technology of three-phase two-layer equation, not only make voltage sine level improve one grade, bring up to the voltage total harmonic distortion less than 1% level by line voltage sinusoidal waveform aberration rate about 2%, and Electro Magnetic Compatibility improves greatly also.The multipole resultant field winding of rotor non-salient pole has improved the dynamic stability ability of generator greatly.

Description of drawings

Fig. 1 is a Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator work electric system schematic diagram of the present invention;

Fig. 2 is a Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator stator main winding A phase schematic diagram of the present invention;

Fig. 3 is the auxiliary winding a phase schematic diagram of Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator stator of the present invention;

Embodiment

Fig. 2 is that the groove number is that the intermediate frequency of 36 grooves, 14 utmost points, 3 phases is the stator main winding of the Multiwave Mixed Excitation source Filter Brushless Three-phase Synchronous Generator of 400HZ, A has 4 circles by pitch 1-3 as we know from the figure, pitch 1-4 by 6 circles totally 10 circle windings form.And B is mutually and also as shown in fig. 1 position of C layout mutually, structure and category-A seemingly, three phase windings that formation A, B, C three symmetrical mutual deviations 120 are spent electrical degrees.This three phase windings form the structure of single, double layer winding.The brushless AC generator line voltage-form distortion rate level of this structure winding is about 2%.For generator voltage waveform total harmonic distortion is controlled in 1%, be provided with one and overlap three symmetrical auxiliary windings, a phase active power filtering winding is by pitch 1-3 2 circles to be arranged as can be known from Fig. 3, pitch 1-9 by 2 circles totally 4 circle windings form, and relatively-stationary position is arranged with Fig. 1.Fig. 2 a phase winding structure of only having drawn, and marked the lead-out wire of b, c phase, b, c structure are and a mutual deviation 120 degree electrical degrees mutually that a, b, c are a kind of three symmetrical Filter Winding.The turn ratio of main winding and the every circle of auxiliary winding is 2: 1, therefore, is the approximately equalised winding of a kind of groove filling rate in the stator slot of this kind generator, divides bilayer or three-decker in the groove.

Generator has coaxial AC exciter.E ₁, E ₂Be the exciter stator winding, a ', b ', c ' are exciter rotor armature winding.Generator unit stator main winding A, B, C connect with auxiliary winding a, b, c, and the connection place tap meets rectifier Z ₁, Z ₂, Z ₃And voltage regulator (AVR), externally output token U, V, W, N.Main rotor has salient pole type and hidden pole type, and salient pole rotor magnetic field winding is F ₁F ₂It is a kind of winding of pattern; Distributed polar rotor magnetic field winding F ₁F ₂Be by F ₁F ₃And F ₃F ₂The multipole combined winding of two kinds of different numbers of poles, F ₁F ₂Piezo-resistance R in parallel, rotor is provided with absolute damping DL, F ₁F ₂, a ', b ', c ' are by rotating rectifier Z _zConnect into operating circuit, the compound winding of multipolar system makes the dynamic stability ability of generator stronger.Reaction speed is faster.

A, b, c both had filter action to A, B, C, offered E again ₁, E ₂Many ripples excitation.Because the energy that a, b, c get makes multiple harmonic energy intrinsic in the motor internal magnetic field basically, basically do not consume extra power, major part is to utilize these inner unnecessary harmful energy, so both saved the required additional outer energy of other excitation mode, also very big again to the electric quality of motor raising is changed evil and is benefit.

The principle of filter action is a, b, that the c Filter Winding is sent is one group and main winding A, B, equal and opposite in direction among the C, the multiple harmonic that direction is opposite, thereby this group harmonic wave is all eliminated or effectively weakening, the voltage waveform that motor is exported reaches the sinusoidal waveform of perfect type, total harmonic distortion is less than 1%, for example the average every circle of the triple-frequency harmonics amount that contains in Fig. 1 winding is 0.1366 * 2,10 circles contain 0.1366 * 2 * 10, and the every circle of triple-frequency harmonics amount in accompanying drawing 2 windings is-0.6830,4 circles are for-0.6830 * 4, then the mutually total triple-frequency harmonics content of generator U is+0.1366 * 2 * 10-0.6830 * 4=0, so triple-frequency harmonics content has been eliminated in motor output, played desirable active power filtering effect, other subharmonic also has similar effect, so improved voltage quality greatly, reached and make the voltage total harmonic distortion less than 1% level.

Many ripples excitation action principle is, Filter Winding a, b, c are a kind of many wave windings, except A, B, C main winding are had the good filter action, still are a kind of good many ripples excitation source, mainly contain triple-frequency harmonics in many wave windings, so very strong dynamic compound excitation ability is arranged.It also contains certain first-harmonic simultaneously, so generator is fine from excitation, in addition, it also contains more rich other subharmonic, and these subharmonic have good dynamic property, to the free filter action in magnetic field, have reduced the time harmonic content among A, B, the C.Improved the big nonlinear load of generator belt so greatly, big asymmetric load, big rectification load, band ups power, belt switch power supply, the ability and the performance of band mainframe computer etc.Therefore, under all kinds of electrical loads of modern times, this generator all can be stable, nonoscillatory, and Electro Magnetic Compatibility is very strong.

Generator main winding A, each wire tag that goes out in accompanying drawing 1 and accompanying drawing 2 of B, C are respectively AX, BY, CZ.The go out wire tag of the auxiliary winding of generator in accompanying drawing 1 and accompanying drawing 3 is respectively ax, by, cz.

Claims

1. A multi-wave hybrid excitation internal source filter brushless three-phase synchronous generator, characterized in that: the stator winding of the generator contains two groups of three-phase symmetrical windings, one group is the main winding, and is characterized by single and double layers The three-phase symmetrical sinusoidal windings have equal turns and unequal spacing; one group is the auxiliary winding, which is also characterized by three-phase symmetric equal turns and unequal spacing. It functions as a multi-wave mixed excitation source winding and is also an internal source filter. The turn ratio of each coil of the main winding and the auxiliary winding is 2:1.

2. A multi-wave hybrid excitation internal source filter brushless three-phase synchronous generator as claimed in claim 1, characterized in that the connection method of the main winding and the auxiliary winding in the stator winding of the generator is connected in series, and the two The tap output of the connection point of the winding is connected to the three-phase half-wave rectifier bridge. After rectification, the excitation current of the exciter is controlled by the voltage regulator (AVR), thereby stabilizing the voltage accuracy of the generator under various working conditions.

3. A multi-wave hybrid excitation internal source filter brushless three-phase synchronous generator as claimed in claim 1 or 2, characterized in that the rotor is made of hidden pole type, and the field winding is a multi-pole composite winding. Composite windings consist of two windings with different numbers of poles connected in series or in parallel.