CN104506098B

CN104506098B - Low-power four-phase switched reluctance generator power converter

Info

Publication number: CN104506098B
Application number: CN201410853059.5A
Authority: CN
Inventors: 孙冠群
Original assignee: China Jiliang University
Current assignee: China Jiliang University
Priority date: 2014-12-30
Filing date: 2014-12-30
Publication date: 2017-05-24
Anticipated expiration: 2034-12-30
Also published as: CN104506098A

Abstract

The invention discloses a low-power four-phase switched reluctance generator power converter. A main circuit of the converter consists of a separately excited asymmetric half-bridge four-phase winding power converter main circuit and a Zeta chopper circuit which are in end-to-end connection in parallel; a generation output side of the separately excited asymmetric half-bridge four-phase winding power converter main circuit is in parallel connection with an input side of the Zeta chopper circuit; and an output side of the Zeta chopper circuit is in parallel connection with an excitation input side of the separately excited asymmetric half-bridge four-phase winding power converter main circuit. The converter has a simple structure, two windings can work at the same time, so that power density is increased, the voltage and current pulsation is reduced, the wide adjustable range of the exciting voltage is beneficial to the control of the maximum power output, and the converter can be used in the fields of small-scale wind power generation and direct current power supply.

Description

The phase switch reluctance generator power converter of small-power four

Technical field

The present invention relates to Motor Control Field, and in particular to a kind of four phase winding switch reluctance generators of small-power rank Power inverter and its control.

Background technology

Switch reluctance generator (Switched Reluctance Generator, referred to as：SRG) simple structure, on rotor It is brushless, without winding, without permanent magnet；In certain range of speeds, output end voltage will not change with the change of rotating speed, non- It is very suitable for wind-power electricity generation and as dc source；And in the process of running, switch reluctance generator controllable parameter is more, such as switch Angle control, Current cut control, PWM controls etc., can easily realize more complicated control strategy, and flexible controlled output is straight Stream voltage and current.

It is divided into excitation in the switch reluctance generator course of work and generates electricity two stages, and is that timesharing is carried out, excitation side Formula is divided into separate excitation and self-excitation mode again, and separate excitation mode realizes excitation and the respective independent loop that generates electricity, and reliability is high, but generally requires Storage battery dedicated or other dc sources provide power supply, but output voltage electric current as field power supply, self-excitation mode without extraneous Pulsation is larger, and larger pressure is caused to filtering.

In view of improving winding current when excitation voltage is conducive to improving follow-up afterflow generating and then improving power output, one Change the problem that traditional excitation voltage is unable to on-line control, occur in that some can online be adjusted according to control system demand in recent years The new power inverter excitation part circuit structure of whole excitation input voltage, such as：The such as the 1st, Peng Hanmei, easy ganoderma lucidum are based on Switch reluctance generator novel excitation pattern [J] solar energy journals of Buck converters, 2012,33 (3) .2, Duan Lihua bases In research [J] the ship power technologies for the offshore drilling platform wind generator system hardware configuration for becoming generating voltage power inverter, 2012,32 (2) there is excitation voltage with respect to one direction change, and the big shortcoming of output generating voltage pulsation of current in the former, after Person then must be equipped with special separate excitation field power supply, increased filtering pressure and maintenance cost.

Additionally, switch reluctance generator only considers any instantaneous situation that only a phase winding is powered at present, and according to opening Close reluctance motor stator and rotor sructure relation, more than or equal to four phase windings in the case of, completely can contemplate two phase windings simultaneously work The possibility of work.

The content of the invention

Background technology according to more than, the present invention proposes a kind of satisfaction while four phase windings for having two phase windings to be powered are opened Reluctance generator power inverter main circuit and its control mode are closed, excitation voltage is adjustable, simple structure easy maintenance, increase Power density simultaneously reduces voltage x current pulsation.

The technical scheme is that：

The phase switch reluctance generator power converter of small-power four, its main circuit by separate excitation type asymmetrical half-bridge formula four around Group power inverter main circuit 1 and Zeta chopper circuits 2 are constituted, it is characterised in that the phase of separate excitation type asymmetrical half-bridge formula four Winding power inverter main circuit 1 is connected in parallel mutually with the head and the tail of the Zeta chopper circuits 2, wherein separate excitation type asymmetrical half-bridge The input side of the generating outlet side parallel connection Zeta chopper circuits 2 of the phase winding power inverter main circuit 1 of formula four, Zeta chopper circuits 2 outlet side is in parallel with the excitation input side of the phase winding power inverter main circuit 1 of separate excitation type asymmetrical half-bridge formula four.

The described phase winding power inverter main circuit 1 of separate excitation type asymmetrical half-bridge formula four is by four groups of asymmetrical half-bridge formulas Circuit is constituted, and every group of winding for connecting and controlling a phase switch reluctance generator, respectively A, B, C, D phase winding are simultaneously switching magnetic By rule symmetrically coiling distribution in resistance generator stator salient poles, wherein A phase windings are adjacent with B phases and D phase windings, C Phase winding is adjacent with B phases and D phase windings, according to switched reluctance machines rotor corresponding relation and rotor current location, Yi Jikai Reluctance generator excitation and generating timesharing rule are closed, is circulated according to the working method of AB-BC-CD-DA-AB, while the two of work Phase winding, one is mutually in the excitation stage, and another phase is then in afterflow power generating stage, treats the foregoing winding in afterflow power generating stage After being reduced to zero before producing electronic torque, the winding that next phase is in rotor salient pole center line overlapping position enters excitation to electric current Stage, and the winding in foregoing excitation stage enters afterflow power generating stage, such sequential transformations working law.

Technique effect of the invention mainly has：

Whenever the double winding mode of operation that another phase winding generates electricity when the 1st, because of a phase winding excitation, have winding to generate electricity Output, so as to increase the average value of output voltage and electric current, improves the output power density and power total amount of generator；And Under simplex winding mode of operation, the excitation stage is because without electric energy output, its average output voltage electric current is low, power output Density is small, and power total amount is few；

2nd, under double winding mode of operation as described above, the pulsation situation of its output voltage electric current is also much smaller；

3rd, in practice, field power supply should belong to self-excitation pattern from generating output voluntarily, but as described above, not Output voltage pulsation of current is big under having the shortcomings that traditional self-excitation pattern.

4th, Zeta chopper circuits 2 of the invention, by the duty cycle adjustment of internal unique electronic power switch pipe, Ke Yishi Existing its output voltage is higher or lower than input voltage, and range of regulation is wide, beneficial to the control for realizing more preferable power inverter main circuit System, especially maximum power output control.

Brief description of the drawings

Fig. 1 show the phase switch reluctance generator power converter main circuit diagram of small-power of the invention four.

Fig. 2 show the pole configuration switches reluctance generator stator winding inductance of four phase of the invention 8/6 and rotor position angle Graph of a relation.

In figure：1st, the phase winding power inverter main circuit of separate excitation type asymmetrical half-bridge formula four, 2, Zeta chopper circuits.

Specific embodiment

Accompanying drawing 1 be the phase switch reluctance generator power converter main circuit of small-power of the invention four, A, B, C, D tetra- around The phase winding power of separate excitation type asymmetrical half-bridge formula four is constituted centered on group according to asymmetrical half-bridge formula and traditional separated exciting pattern to become Parallel operation main circuit 1, excitation part is individually completed by Zeta chopper circuits 2.

It is the pole structure of four phase 8/6 that the present embodiment chooses switch reluctance generator, i.e. the small-power of the pole of 8 pole rotor of stator 6 is opened Reluctance generator is closed, its stator winding inductance is as shown in Figure 2 with rotor-position angular dependence；In 0 ° of origin position, inductance is minimum L_min, now stator salient poles overlapped with rotor recesses center line, the minimum then electricity of rotor salient pole center line coincidence air gap at 30 ° Sense is L to the maximum_max, occur the inductance minimum a cycle that completes during to 60 ° again and change, to winding when inductance rises at 0 ° -30 ° It is powered and produces forward torque to do motor running, 30 ° of -60 ° of intervals can then produces opposing torque generator operation, but must be at 30 ° Current excitation is passed through during left and right in advance, electric current breaks field power supply again after setting up, and rotor can just be produced under external force Bigger generation current, breaks the angle of field power supply about 45 ° or so of position.

In initialization, first with remanent magnetism, the generator starting initial stage generates electricity according to rotor-position phase winding and produces Power supply, exported as ensuing field power supply through Zeta chopper circuits 2, so further increase afterflow generation current voltage Value, generates electricity and excitation system power supply so as to set up, and eliminates conventional initial excitation battery and diode branch.

Explained in detail its course of work below according to Fig. 1：

Assuming that according to rotor-position, salient pole where B phase windings first overlaps with rotor with salient pole center line, meets excitation and start Condition, the generating voltage that another phase winding is set up by remanent magnetism during by the use of initial start through Zeta chopper circuits 2 export as Field power supply, now the 3rd electronic power switch pipe V3 and the 4th electronic power switch pipe V4 closure conducting excitation；Rotation is passed through After 15 ° or so, more than shut-off this two electronic power switch pipes, the then magnetic energy for now being stored in B phase windings will be along the 3rd electricity Power diode D3 and the 4th Power Diode Pumped D4 afterflows simultaneously export electric energy, note now, being turned to according to rotor, its adjacent A phase There is the position that corresponding its stator salient poles overlap with rotor with salient pole center line in winding or C phase windings, it is assumed that be C phase windings, now The 5th electronic power switch pipe V5 need to be closed at and the 6th electronic power switch pipe V6 gives C phase winding excitations, that is to say, that Hereafter it is that the afterflow of B phase windings generates electricity and this double winding of C phase windings excitation works simultaneously in the range of about rotate 15 °；Such as Upper BC windings work about 15 ° afterwards simultaneously, and generation current must control it to stop to prevent from entering the electricity of power consumption in B phase windings Dynamic state, now control two electronic power switch pipes of C phase winding excitations disconnect and by the 5th Power Diode Pumped D5 and the 6th Power Diode Pumped D6 afterflows generate electricity, while stator salient poles where D phase windings overlap with rotor with salient pole center line and possessed excitation bar Part, so closing the 7th electronic power switch pipe V7 and the 8th electronic power switch pipe V8 while C phase windings excitation forwarding electricity D phase winding excitations are given, this stage is CD phase windings working stage simultaneously；Next, be that DA windings work simultaneously similarly, A phases The excitation of winding is undertaken by the first electronic power switch pipe V1 and the second electronic power switch pipe V2, and the first electric power is flowed through during generating Diode D1 and the second Power Diode Pumped D2；It is AB phases after DA phases, is subsequently returned to BC, work and so on.

Zeta chopper circuits 2 complete the supply and conversion of excitation voltage, and its course of work is：

When the 9th electronic power switch pipe V9 is closed and turned on, input side electric current is through the 9th electronic power switch pipe V9 to the One reactor L1 charging energy-storings, meanwhile, input side electric current is also common with the first capacitor C1 to encourage through the output supply of the second reactor Magnetoelectricity stream；After after the 9th electronic power switch pipe V9 shut-offs, the first reactor L1 is through the 9th Power Diode Pumped D9 to the first electric capacity Device C1 charges, in the energy transfer that it is stored to the first capacitor C1, while the electric current of the second reactor L2 is through the 9th electric power two Pole pipe D9 afterflows；Zeta chopper circuits 2 are drawn using formula Wherein α is the 9th electricity The PWM control dutycycles of power electronic switching tube V9, it is seen that step-down is realized as α ＜ 0.5, boosting is realized during α ＞ 0.5.

Whole electronic power switch pipes described in the present embodiment are IGBT or power MOSFET.

Claims

1. the phase switch reluctance generator power converter of small-power four, its main circuit is by the phase winding of separate excitation type asymmetrical half-bridge formula four Power inverter main circuit (1) and Zeta chopper circuits (2) are constituted, it is characterised in that the separate excitation type asymmetrical half-bridge formula four Phase winding power inverter main circuit (1) is connected in parallel mutually with the Zeta chopper circuits (2) head and the tail, and wherein separate excitation type is not right Claim the input side of generating outlet side parallel connection Zeta chopper circuits (2) of phase winding power inverter main circuit (1) of semibridge system four, The outlet side of Zeta chopper circuits (2) and the excitation of phase winding power inverter main circuit (1) of separate excitation type asymmetrical half-bridge formula four Input side is in parallel；

Phase winding power inverter main circuit (1) of separate excitation type asymmetrical half-bridge formula four is by four groups of circuit groups of asymmetrical half-bridge formula Into every group of winding for connecting and controlling a phase switch reluctance generator, respectively A, B, C, D phase winding simultaneously generate electricity in switching magnetic-resistance By rule symmetrically coiling distribution on machine internal stator salient pole, wherein A phase windings are adjacent with B phases and D phase windings, C phase windings It is adjacent with B phases and D phase windings, according to switched reluctance machines rotor corresponding relation and rotor current location, and switching magnetic-resistance Generator excitation and generating timesharing rule, circulate according to the working method of AB-BC-CD-DA-AB, while two phase windings of work, One is mutually in the excitation stage, and another phase is then in afterflow power generating stage, treats that the foregoing winding current in afterflow power generating stage exists Produce after being reduced to zero before electronic torque, the winding that next phase is in rotor salient pole center line overlapping position enters the excitation stage, And the winding in foregoing excitation stage enters afterflow power generating stage, such sequential transformations working law.