CN104506098A

CN104506098A - Low-power four-phase switched reluctance generator power converter

Info

Publication number: CN104506098A
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: 2015-04-08
Anticipated expiration: 2034-12-30
Also published as: CN104506098B

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

Small-power four phase switch reluctance generator power converter

Technical field

The present invention relates to Motor Control Field, be specifically related to a kind of power inverter and control thereof of four phase winding switch reluctance generators of small-power rank.

Background technology

(Switched Reluctance Generator, is called for short: SRG) structure is simple switch reluctance generator, brushless on rotor, without winding, without permanent magnet; In certain range of speeds, output end voltage can not change along with the change of rotating speed, is very suitable for wind power generation and is used as DC power supply; And in running, switch reluctance generator controllable parameter is many, as switching angle control, Current cut control, PWM control, the control strategy of more complicated can be realized easily, control output dc voltage and electric current flexibly.

Excitation and two stages of generating are divided in the switch reluctance generator course of work, and be that timesharing is carried out, excitation mode is divided into again separate excitation and self-excitation mode, separate excitation mode realizes excitation and the respective independent loop of generating, reliability is high, but general needs storage battery dedicated or other DC power supply as field power supply, and self-excitation mode provides power supply without the need to the external world, but output voltage current pulsation is comparatively large, causes larger pressure to filtering.

Be conducive to winding current when improving follow-up afterflow generating in view of improving exciting voltage and then improve power output, changing traditional exciting voltage can not the problem of on-line control, occur that some can according to the novel power inverter excitation part circuit structure of control system demand on-line tuning excitation input voltage in recent years, as: 1, Peng Hanmei, easy glossy ganoderma etc. based on the switch reluctance generator novel excitation pattern [J] of Buck converter. solar energy journal, 2012, , 33 (3) .2, Duan Lihua. based on the research [J] of the offshore drilling platform wind generator system hardware configuration of change generating voltage power inverter. ship power technology, 2012, 32 (2). there is the relative one direction change of exciting voltage in the former, and export the large shortcoming of generating voltage current pulsation, latter must be equipped with special separate excitation field power supply, add filtering pressure and maintenance cost.

In addition, switch reluctance generator only considers any instantaneous situation only having a phase winding energising at present, and according to stator-rotor structure of switched reluctance motor relation, when being more than or equal to four phase windings, can consider the possibility that two phase windings work simultaneously completely.

Summary of the invention

According to above background technology, the present invention proposes a kind of satisfied four phase winding switch reluctance generator power inverter main circuit and control modes thereof simultaneously having two phase windings energisings, exciting voltage is adjustable, and structure simple-to-maintain is easy, increases power density and reduces electric current and voltage pulsation.

Technical scheme of the present invention is:

Small-power four phase switch reluctance generator power converter, its main circuit is made up of separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit 1 and Zeta chopper circuit 2, it is characterized in that, described separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit 1 is connected in parallel mutually with described Zeta chopper circuit 2 head and the tail, the wherein input side of the generating outlet side of separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit 1 Zeta chopper circuit 2 in parallel, the outlet side of Zeta chopper circuit 2 is in parallel with the excitation input side of separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit 1.

Described separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit 1 is made up of the circuit of four groups of asymmetrical half-bridge formulas, often group connects and controls the winding of a phase switch reluctance generator, be respectively A, B, C, D phase winding and on switch reluctance generator internal stator salient pole regularly coiling symmetrically distribution, wherein A phase winding is adjacent with D phase winding with B phase, C phase winding is adjacent with D phase winding with B phase, according to switched reluctance machines rotor corresponding relation and rotor current location, and switch reluctance generator excitation and generating timesharing rule, circulate according to the working method of AB-BC-CD-DA-AB, two phase windings simultaneously worked, one is in the excitation stage mutually, another phase is then in afterflow power generating stage, after the aforementioned winding current being in afterflow power generating stage reduced to zero before the electronic torque of generation, next winding being in rotor salient pole center line overlapping position mutually enters the excitation stage, and the winding in aforementioned excitation stage enters afterflow power generating stage, sequential transformations working law like this.

Technique effect of the present invention mainly contains:

1, because of the double winding mode of operation of another phase winding generating during a phase winding excitation, whenever there is winding to generate electricity and export, thus increase the mean value of output voltage and electric current, improve output power density and the power total amount of generator; And under simplex winding mode of operation, the excitation stage, so its average output voltage electric current is low, output power density was little, and power total amount is few because do not have electric energy to export;

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

3, in reality, the generating that field power supply derives from voluntarily exports, and should belong to self-excitation pattern, but as mentioned above, the shortcoming that under traditional self-excitation pattern, output voltage current pulsation is not large.

4, Zeta chopper circuit 2 of the present invention, by the duty cycle adjustment of the unique electronic power switch pipe in inside, can realize its output voltage higher or lower than input voltage, range of regulation is wide, be beneficial to the control realizing better power inverter main circuit, especially maximum power output controls.

Accompanying drawing explanation

Figure 1 shows that small-power four phase switch reluctance generator power converter main circuit diagram of the present invention.

Figure 2 shows that four phase 8/6 electrode structure switch reluctance generator stator winding inductance and rotor position angle graphs of a relation of the present invention.

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

Embodiment

Accompanying drawing 1 is small-power four phase switch reluctance generator power converter main circuit of the present invention, A, B, C, D tetra-forms separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit 1 according to asymmetrical half-bridge formula and traditional separated exciting pattern centered by phase winding, and excitation part is completed by Zeta chopper circuit 2 separately.

It is four phase 8/6 electrode structures that the present embodiment chooses switch reluctance generator, i.e. the small power switch reluctance generator of stator 8 pole rotor 6 pole, and its stator winding inductance and rotor-position angular dependence are as shown in Figure 2; At 0 ° of origin position, inductance is minimum is L _min, now stator salient poles overlaps with rotor recesses center line, and 30 ° time, rotor salient pole center line coincidence air gap is minimum, and inductance is L to the maximum _maxone-period change is completed to occurring again when 60 ° that inductance is minimum, produce forward torque to winding energising when inductance rises 0 °-30 ° time and do motor running, 30 ° of-60 ° of intervals then can produce opposing torque generator operation, but about 30 ° time, current excitation must be passed in advance, electric current breaks after setting up field power supply again, and rotor just can produce larger generation current under external force, and the angle of the field power supply that breaks is greatly about the position of about 45 °.

When initialization, first remanent magnetism is utilized, the power supply that the generator starting initial stage produces according to the generating of rotor-position phase winding, export as ensuing field power supply through Zeta chopper circuit 2, and then strengthen afterflow generation current magnitude of voltage further, thus set up generating and excitation system power supply, eliminate conventional initial excitation storage battery and diode branch.

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

Suppose according to rotor-position, first B phase winding place salient pole overlaps with rotor with salient pole center line, meet the condition that excitation starts, the generating voltage that when utilizing initial start, another phase winding is set up because of remanent magnetism exports as field power supply through Zeta chopper circuit 2, and now the 3rd electronic power switch pipe V3 and the 4th electronic power switch pipe V4 closes conducting excitation, after rotating past about 15 °, turn off these two electronic power switch pipes above, the magnetic energy that then now stores in B phase winding will export electric energy along the 3rd Power Diode Pumped D3 and the 4th Power Diode Pumped D4 afterflow, note now, turn to according to rotor, there is the position that its stator salient poles corresponding overlaps with rotor with salient pole center line in its adjacent A phase winding or C phase winding, be assumed to be C phase winding, now need to close the 5th electronic power switch pipe V5 and the 6th electronic power switch pipe V6 to C phase winding excitation simultaneously, that is, within the scope of 15 ° of about rotation after this, that B phase winding afterflow generating and this double winding of C phase winding excitation work simultaneously, as above BC winding works after about 15 ° simultaneously, in B phase winding, generation current must control its stopping with the motoring condition preventing from entering power consumption, now two electronic power switch pipes of control C phase winding excitation disconnect and are generated electricity by the 5th Power Diode Pumped D5 and the 6th Power Diode Pumped D6 afterflow, D phase winding place stator salient poles overlaps with rotor with salient pole center line and has possessed excitation condition simultaneously, so C phase winding excitation closes the 7th electronic power switch pipe V7 and the 8th electronic power switch pipe V8 to D phase winding excitation while forwarding electricity, this stage is CD phase winding working stage simultaneously, next, similarly, be that DA winding works simultaneously, the excitation of A phase winding is born by the first electronic power switch pipe V1 and the second electronic power switch pipe V2, flows through the first Power Diode Pumped D1 and the second Power Diode Pumped D2 during generating, be AB phase after DA phase, subsequently get back to BC again, work and so forth.

Zeta chopper circuit 2 completes supply and the conversion of exciting voltage, and its course of work is:

When the 9th electronic power switch pipe V9 closes conducting, input side electric current is through the 9th electronic power switch pipe V9 to the first reactor L1 charging energy-storing, and meanwhile, input side electric current also with the first capacitor C1 exports supply exciting current through the second reactor jointly; Treat that the 9th electronic power switch pipe V9 closes to have no progeny, the first reactor L1 charges to the first capacitor C1 through the 9th Power Diode Pumped D9, and its energy trasfer stored is on the first capacitor C1, and the electric current of the second reactor L2 is through the 9th Power Diode Pumped D9 afterflow simultaneously; Formula can be utilized to draw Zeta chopper circuit 2 wherein α is the PWM control duty ratio of the 9th electronic power switch pipe V9, realizes step-down as seen, realize boosting during α > 0.5 as α < 0.5.

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

Claims

1. small-power four phase switch reluctance generator power converter, its main circuit is made up of separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit (1) and Zeta chopper circuit (2), it is characterized in that, described separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit (1) is connected in parallel mutually with described Zeta chopper circuit (2) head and the tail, the wherein input side of the generating outlet side of separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit (1) Zeta chopper circuit (2) in parallel, the outlet side of Zeta chopper circuit (2) is in parallel with the excitation input side of separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit (1).

2. small-power four phase switch reluctance generator power converter according to claim 1, it is characterized in that, described separate excitation type asymmetrical half-bridge formula four phase winding power inverter main circuit (1) is made up of the circuit of four groups of asymmetrical half-bridge formulas, often group connects and controls the winding of a phase switch reluctance generator, be respectively A, B, C, D phase winding and on switch reluctance generator internal stator salient pole regularly coiling symmetrically distribution, wherein A phase winding is adjacent with D phase winding with B phase, C phase winding is adjacent with D phase winding with B phase, according to switched reluctance machines rotor corresponding relation and rotor current location, and switch reluctance generator excitation and generating timesharing rule, circulate according to the working method of AB-BC-CD-DA-AB, two phase windings simultaneously worked, one is in the excitation stage mutually, another phase is then in afterflow power generating stage, after the aforementioned winding current being in afterflow power generating stage reduced to zero before the electronic torque of generation, next winding being in rotor salient pole center line overlapping position mutually enters the excitation stage, and the winding in aforementioned excitation stage enters afterflow power generating stage, sequential transformations working law like this.