CN105322838A - Three-level motor power converter achieving quick demagnetization - Google Patents
Three-level motor power converter achieving quick demagnetization Download PDFInfo
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- CN105322838A CN105322838A CN201410310736.9A CN201410310736A CN105322838A CN 105322838 A CN105322838 A CN 105322838A CN 201410310736 A CN201410310736 A CN 201410310736A CN 105322838 A CN105322838 A CN 105322838A
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Abstract
The invention discloses a three-level motor power converter achieving quick demagnetization, and the converter comprises an upper DC power supply, a lower DC power supply, a three-phase winding, an upper three-phase power device, a low three-phase power device, a filtering capacitor, an energy storage capacitor, and six freewheel diodes. Compared with the topological structure of a conventional three-phase switching magnetic resistance motor power converter, the converter is additionally provided with the upper DC power supply, adjusts the voltage of the upper DC power supply to be greater than the exciting voltage of the lower DC power supply thorough a voltage adjuster, enables the decrease speed of a phase current at a follow current stage to be increased, increases the discharge speed of a phase winding, prolongs the time when the current of the phase winding maintains the maximum effective value while eliminating a braking torque, increases the output power of a system, and reduces the torque ripple.
Description
Technical field
The present invention relates to the drived control of switched reluctance machines and the technical field of power inverter design, particularly relate to a kind of dual power supply three level power converter.
Background technology
Switched Reluctance Motor is the electromechanical integrated product based on modern power electronic and Control Technique of Microcomputer, have that structure is simple, firm, cost is low, respectively work mutually independent, control flexibly, operational efficiency is high, detent torque is low feature.Due to the control performance that SRD is excellent, by changing the working method of switched reluctance motor and controlling parameters, the performance characteristics of many different field requirement can be realized easily and meet some special service behaviour indexs.SRD occupies one seat in electric drive field gradually with the advantage of its uniqueness, and good development prospect becomes one of the most popular problem in current electric drive field.By controlling exploitation, progressively be applied in every field, as household electrical appliance, general industry control, the fields such as extraordinary servo and governing system, electric locomotive traction, space flight apparatus and automotive accessory, so SRD demonstrates the powerful market competitiveness.
The composition of Switched Reluctance Motor mainly comprises five parts, switched reluctance machines, power inverter, main control unit, position detection unit and current detecting unit, and power inverter is used for providing energy when running to motor.The cost shared in SRD of the power inverter of switched reluctance motor is the highest, and a good switched reluctance motor power converter should use the least possible switching device to reduce costs.The power inverter used in typical switched reluctance motor system is asymmetrical half-bridge power inverter, according to the situation about turning on and off of two main switching devices of upper and lower bridge arm, state 1, state 0 and state-1 three kind of different running status often can be had mutually.Wherein, state 1 is the situation that two main switching devices of upper and lower bridge arm are in conducting state simultaneously, and motor is in the excitation stage, and now phase winding both end voltage is direct current power source voltage U
s; State 0 is that the main switching device of upper brachium pontis is in off state, and the main switching device of lower brachium pontis is in conducting state, and now phase winding both end voltage is 0, and motor is in freewheeling state, and phase current carries out afterflow by the main switching device of fly-wheel diode and lower brachium pontis; State-1 is the situation that two main switching devices of upper and lower bridge arm are in off state simultaneously, and now phase winding both end voltage is-U
s, motor power feedback power, phase current forms loop by two fly-wheel diodes.
Traditional power converter of switch reluctance motor many employings asymmetrical half-bridge power inverter, in order to obtain larger effective torque, should reduce brake torque as far as possible, namely makes phase winding current attenuation to 0 during state-1 as early as possible.Because excitation is identical with the magnitude of voltage of freewheeling period in asymmetrical half-bridge power inverter, can not regulate separately, extend the action time of brake torque, have impact on the effect of system Driving Torque greatly, not reach the rated power of motor.
Summary of the invention
The technical problem to be solved in the present invention is traditional power converter of switch reluctance motor because in asymmetrical half-bridge power inverter, excitation is identical with the magnitude of voltage of freewheeling period, can not regulate separately, extend the action time of brake torque, have impact on the effect of system Driving Torque greatly, do not reach the rated power of motor.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of three level power of motor converter realizing demagnetization fast, comprise DC power supply, lower DC power supply, three-phase windings, device for power switching, filter capacitor, storage capacitor and six fly-wheel diodes under device for power switching, three-phase on three-phase; Described upper direct current power source voltage is greater than lower direct current power source voltage; Filter capacitor is in parallel with the lower DC power supply for excitation; Storage capacitor is connected between upper and lower DC power supply; The upper end correspondence of described every phase winding connects the emitter of device for power switching in a phase, and lower end connects the collector electrode of device for power switching under a phase, and the emitter of the lower device for power switching of three-phase all connects power supply ground; Every phase winding is equipped with two fly-wheel diodes respectively; The anode of a fly-wheel diode connects power supply ground, and negative electrode connects the junction of motor winding and upper switching device; The anode of another fly-wheel diode connects the junction of motor winding and lower switching device, and negative electrode continues and flows the anode of special upper DC power supply.
Advantage of the present invention is: the present invention is compared with traditional three-phase switch reluctance machine power converter topologies structure, add a upper DC power supply, when not increasing power conversion circuit components and parts, the voltage of upper DC power supply is regulated to make it be greater than the exciting voltage of lower DC power supply by voltage regulator, freewheeling period phase current decrease speed is accelerated, increases the phase winding velocity of discharge; When motor adopts at a high speed Angle-domain imaging method, close angle of rupture θ
offsuitably can delay, the time of the effect of brake torque can be reduced, even eliminate the effect of brake torque, extend the time that phase winding electric current maintains maximum effective value simultaneously, increase the power output of system, reduce torque pulsation.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of switched reluctance motor system.
Fig. 2 is the circuit topological structure of traditional asymmetrical three-phase half-bridge power converter.
Fig. 3 is the operating state (state 1) of asymmetrical three-phase half-bridge power converter.
Fig. 4 is the operating state (state 0) of asymmetrical three-phase half-bridge power converter.
Fig. 5 is the operating state (state-1) of asymmetrical three-phase half-bridge power converter.
Fig. 6 is the circuit topological structure of the dual power supply three level power converter that the present invention adopts.
Fig. 7 is the relation curve of phase inductance and rotor position angle θ in switched reluctance machines linear model.
Fig. 8 is the operating state of dual power supply three level power converter-2 level that the present invention adopts.
Phase current waveform when Fig. 9 is switched reluctance machines employing Angle-domain imaging method and afterflow slope k are on the impact of electric current phase current waveform.
Specific embodiments
Below in conjunction with specific embodiments and accompanying drawing, the invention will be further described.
As shown in Figure 1-2, the composition of Switched Reluctance Motor mainly comprises five parts, switched reluctance machines, power inverter, main control unit, position detection unit and current detecting unit, and power inverter is used for providing energy when running to motor.
The cost shared in SRD of the power inverter of switched reluctance motor is the highest, and a good switched reluctance motor power converter should use the least possible switching device to reduce costs.
The power inverter used in typical switched reluctance motor system is asymmetrical half-bridge power inverter, according to the situation about turning on and off of two main switching devices of upper and lower bridge arm, state 1, state 0 and state-1 three kind of different running status often can be had mutually.
As shown in Figure 3, state 1 is the situation that two main switching devices of upper and lower bridge arm are in conducting state simultaneously, and motor is in the excitation stage, and now phase winding both end voltage is direct current power source voltage U
s.
As shown in Figure 4, state 0 is that the main switching device of upper brachium pontis is in off state, and the main switching device of lower brachium pontis is in conducting state, and now phase winding both end voltage is 0, motor is in freewheeling state, and phase current carries out afterflow by the main switching device of fly-wheel diode and lower brachium pontis.
As shown in Figure 5, state-1 is the situation that two main switching devices of upper and lower bridge arm are in off state simultaneously, and now phase winding both end voltage is-U
s, motor power feedback power, phase current forms loop by two fly-wheel diodes.
Therefore, traditional power converter of switch reluctance motor many employings asymmetrical half-bridge power inverter, in order to obtain larger effective torque, should reduce brake torque as far as possible, namely makes phase winding current attenuation to 0 during state-1 as early as possible.Because excitation is identical with the magnitude of voltage of freewheeling period in asymmetrical half-bridge power inverter, can not regulate separately, extend the action time of brake torque, have impact on the effect of system Driving Torque greatly, not reach the rated power of motor.
As shown in Figure 6, the present invention proposes a kind of tri-level switch resistance motor power converter of dual power supply, switched reluctance motor system comprises switched reluctance machines body, power inverter, controller, position detection unit and current detecting unit, wherein power inverter is the I/O channel of system capacity, and described power inverter is dual power supply three level power converter.
Described dual power supply three level power converter comprises two DC power supply, each phase winding L of switched reluctance machines
a, L
b, L
c, a filter capacitor C
s1, a storage capacitor C
s2, six device for power switching Q
aH, Q
aL, Q
bH, Q
bL, Q
cH, Q
cL, and six power diode D
aH, D
aL, D
bH, D
bL, D
cH, D
cL; Two DC power supply adopt alternating current to obtain after bridge rectifier rectification, and in requirement, direct current power source voltage is greater than lower direct current power source voltage; Filter capacitor C
s1in parallel with the lower DC power supply for excitation; Storage capacitor C
s2be connected on two dc power supply U
s1with U
s2between.
Six device for power switching Q of described dual power supply three level power converter
aH, Q
aL, Q
bH, Q
bL, Q
cH, Q
cLdirectly and three-phase switch reluctance machine winding L
a, L
b, L
cbe connected; Device for power switching Q
aH, Q
bH, Q
cHfor upper switching device, device for power switching Q
aL, Q
bL, Q
cLfor lower switching device, three-phase switch reluctance machine winding L
a, L
b, L
cupper end connect the emitter of switching device on one of them, three-phase switch reluctance machine winding L respectively
a, L
b, L
clower end connect the collector electrode of one of them lower switching device respectively, the emitter of three lower switching devices all connects power supply ground;
Six power diode D of described dual power supply three level power converter
a1, D
a2, D
b3, D
b4, D
c5, D
c6as three-phase switch reluctance machine motor winding L
a, L
b, L
cfly-wheel diode; Every phase motor winding uses two fly-wheel diodes respectively; The anode of one of them fly-wheel diode connects power supply ground, and negative electrode connects the upper end with the emitter of the upper switching device of motor winding switching and this phase motor winding; The anode of another fly-wheel diode connects the lower end with the collector electrode of the lower switching device of motor winding switching and this phase motor winding, and negative electrode continues and flows the anode of special upper DC power supply;
Owing to usually adopting asymmetrical half-bridge power inverter as the power inverter of switched reluctance machines in prior art, the magnitude of voltage at its excitation stage phase winding two ends and the size of phase current proportional, exciting voltage is larger, and the last exciting current of phase winding is larger, and detent torque increases.
As shown in Figure 7, be the relation curve of phase inductance and rotor position angle θ in switched reluctance machines linear model, if at inductance rising area θ
2≤ θ < θ
3interior energising, revolving electro-motive force is just, produces electronic torque, and the electric energy part that power supply provides is converted into and then stores in the windings with the form of magnetic energy; At the region θ that maximum induction is constant
3≤ θ < θ
4in, revolving electro-motive force is 0, if electric current continues flowing, winding magnetic energy only feeds back to power supply, and rotating shaft does not have electromagnetic torque; If electric current is at inductance decline district θ
4≤ θ < θ
5interior flowing, because revolving electro-motive force is negative, produces brake torque, also known as electric current dead band, will avoid during actual motion as far as possible.When Switched Reluctance Motor runs, to quick-response excitation be realized on the one hand, improve the maximum effective value of phase winding electric current and extend the time that phase winding electric current maintains maximum effective value, motor output torque is increased as far as possible.But along with the increase of current effective value, excitation is identical with the magnitude of voltage of freewheeling period in traditional asymmetrical half-bridge power inverter, can not regulate separately, adopt larger phase winding electric current that time of afterflow will be caused to increase, make phase current enter inductance decline district θ
4≤ θ < θ
5in, extend the action time of brake torque, have impact on the effect of system Driving Torque greatly, do not reach the rated power of motor.For the deficiency of the switched reluctance motor system that existing asymmetrical half-bridge power inverter drives, the present invention proposes the three level power converter that a kind of novel duplicate-power is powered, this power inverter adopts dual power supply, and the DC power supply that freewheeling period is powered is greater than the excitation stage, the demagnetization time can be reduced, realize demagnetizing fast.
The novel duplicate-power three level power converter of powering that the present invention adopts compared with asymmetrical half-bridge power inverter, many upper DC power supply U
s2with a storage capacitor C
s2, do not increase power conversion circuit components and parts.This power inverter has state 1, state 0 and state-2 three kinds of different operating states,
Now for A phase, it is analyzed, is described in detail as follows:
State 1 is two switching device Q up and down of A phase motor winding
aH, Q
aLall be in situation during conducting, its operating state is identical with the state 1 of asymmetrical half-bridge power inverter, and motor is in the excitation stage, and the voltage being now added to phase winding two ends is U
s1.
State 0 is the upper switching device Q of A phase motor winding
aHturn off, lower switching device Q
aLbe in conducting state, now phase winding passes through sustained diode
a2carry out afterflow, phase winding is in freewheeling state, and winding both end voltage is zero.
As shown in Figure 8, state-2 is upper and lower two device for power switching Q
aH, Q
aLall be in situation during shutoff, now phase winding passes through D
a1, D
a2afterflow, simultaneously to storage capacitor C
s2charge, the voltage at winding two ends is-U
s2, than the state-1 adopting asymmetrical half-bridge power inverter, make phase current more promptly decay to 0, eliminate brake torque.
The present invention adopts three level power converter in switched reluctance motor system, realize demagnetization fast, add the power output of system, its course of work is: when switched reluctance motor system starts (inductance is in not near its position), employing state 1 mode, makes (the Q of switch device conductive up and down for conducting phase
aH, Q
aLconducting), U
s1be applied to motor on conducting phase winding, phase current rises fast.During low speed, when electric current reaches copped wave upper limit magnitude, switching device Q in shutoff
aH, circuit working, in state 0, makes phase winding electric current not in rising, by no-voltage afterflow mode, electric current is declined, after electric current declines, again make Q
aHconducting, namely passes through the alternation of state 1 and state 0, realizes Current cut control.During high speed, adopt Angle-domain imaging mode, along with the increase of rotating speed, turn-on angle, shutoff are contended and are gradually moved forward, and adopt state-2 afterflow, namely turn off Q when this phase turns off
aH, Q
aL,-U
s2be added on this phase winding, phase current is declined rapidly, avoid phase current to produce brake torque in inductance decline district.
Embodiment 1:
Select 6/4 pole switching reluctance motor speed regulation system as application.Obtain after two DC power supply connect bridge rectifier by single-phase 220V interchange after voltage stabilizing transformer, connect voltage regulator after rectification circuit, regulate voltage regulator to make lower supply voltage be 100V, power source voltage specifically regulates according to ruuning situation; This example uses photoelectric position sensor (being made up of three slot optical couplings and a disk) to detect rotor run location; Use Hall current sensor element sampling method to carry out current detecting, connect a Hall current sensor respectively in the three level power converter three-phase outlet of dual power supply; Main control unit adopts on DSP, DSP and is connected to three-phase power converters drive singal, current detection signal, three phase position detection signals and DSP power itself 3.3V.6/4 pole switching reluctance motor speed regulation system, in freewheeling period using state-2, regulates voltage regulator to make power source voltage be 180V.
As shown in Figure 9, phase current waveform when figure is switched reluctance machines employing Angle-domain imaging method and afterflow slope k are on the impact of electric current phase current waveform.As seen from the figure, use the present invention that phase current can be made to reduce to zero fast, realize demagnetizing fast, eliminate the effect of brake torque, increase the power output of system, reduce torque pulsation.
Claims (1)
1. one kind realizes the three level power of motor converter of demagnetization fast, it is characterized in that: comprise DC power supply, lower DC power supply, three-phase windings, device for power switching, filter capacitor, storage capacitor and six fly-wheel diodes under device for power switching, three-phase on three-phase;
Described upper direct current power source voltage is greater than lower direct current power source voltage; Filter capacitor is in parallel with the lower DC power supply for excitation; Storage capacitor is connected between upper and lower DC power supply;
The upper end correspondence of described every phase winding connects the emitter of device for power switching in a phase, and lower end connects the collector electrode of device for power switching under a phase, and the emitter of the lower device for power switching of three-phase all connects power supply ground;
Every phase winding is equipped with two fly-wheel diodes respectively; The anode of a fly-wheel diode connects power supply ground, and negative electrode connects the junction of motor winding and upper switching device; The anode of another fly-wheel diode connects the junction of motor winding and lower switching device, and negative electrode continues and flows the anode of special upper DC power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410310736.9A CN105322838A (en) | 2014-07-01 | 2014-07-01 | Three-level motor power converter achieving quick demagnetization |
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|---|---|---|---|
| CN201410310736.9A CN105322838A (en) | 2014-07-01 | 2014-07-01 | Three-level motor power converter achieving quick demagnetization |
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| CN105322838A true CN105322838A (en) | 2016-02-10 |
Family
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743375A (en) * | 2016-04-29 | 2016-07-06 | 天津工业大学 | Multi-level power topology structure of switch reluctance motor |
| CN107171606A (en) * | 2017-07-06 | 2017-09-15 | 中国计量大学 | Small-power Multifunctional three-phase switched reluctance motor system and its control method |
| CN107196575A (en) * | 2017-07-06 | 2017-09-22 | 中国计量大学 | A kind of switched reluctance motor current transformer and its control method |
| CN107332222A (en) * | 2017-07-28 | 2017-11-07 | 尹向阳 | One kind is applied to powerful dc switch arc-control device |
| CN108053970A (en) * | 2017-12-28 | 2018-05-18 | 宁波拓邦智能控制有限公司 | Without the quick demagnetization control method of sensor trapezoidal wave motor commutation, device and motor |
| CN108459199A (en) * | 2018-02-10 | 2018-08-28 | 合肥工业大学 | Improved switched reluctance machines current sample method |
| CN108631662A (en) * | 2018-05-11 | 2018-10-09 | 莱克电气股份有限公司 | A kind of method, apparatus and system of switched reluctance machines braking |
| CN110677084A (en) * | 2019-10-17 | 2020-01-10 | 中国计量大学 | Direct-voltage-boosting self-excitation-changing switched reluctance generator current transformation system |
| CN110729931A (en) * | 2019-10-17 | 2020-01-24 | 中国计量大学 | Direct-current boost variable-excitation LC less-switching-tube switch reluctance generator current conversion system |
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| US20100264858A1 (en) * | 2009-04-17 | 2010-10-21 | Kyungsung University Industry Cooperation Foudation | Passive converter for drive device of switched reluctance motor |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743375A (en) * | 2016-04-29 | 2016-07-06 | 天津工业大学 | Multi-level power topology structure of switch reluctance motor |
| CN107171606A (en) * | 2017-07-06 | 2017-09-15 | 中国计量大学 | Small-power Multifunctional three-phase switched reluctance motor system and its control method |
| CN107196575A (en) * | 2017-07-06 | 2017-09-22 | 中国计量大学 | A kind of switched reluctance motor current transformer and its control method |
| CN107171606B (en) * | 2017-07-06 | 2019-07-30 | 中国计量大学 | Small-power Multifunctional three-phase switched reluctance motor system and its control method |
| CN107196575B (en) * | 2017-07-06 | 2020-06-26 | 中国计量大学 | Switch reluctance motor converter and control method thereof |
| CN107332222A (en) * | 2017-07-28 | 2017-11-07 | 尹向阳 | One kind is applied to powerful dc switch arc-control device |
| WO2019019602A1 (en) * | 2017-07-28 | 2019-01-31 | 广州金升阳科技有限公司 | Direct current switch arc-extinguishing device suitable for high power |
| CN107332222B (en) * | 2017-07-28 | 2020-09-15 | 尹向阳 | Direct current switch arc extinguishing device suitable for high power |
| CN108053970B (en) * | 2017-12-28 | 2020-05-12 | 宁波拓邦智能控制有限公司 | Sensorless trapezoidal wave motor commutation rapid demagnetization control method and device and motor |
| CN108053970A (en) * | 2017-12-28 | 2018-05-18 | 宁波拓邦智能控制有限公司 | Without the quick demagnetization control method of sensor trapezoidal wave motor commutation, device and motor |
| CN108459199A (en) * | 2018-02-10 | 2018-08-28 | 合肥工业大学 | Improved switched reluctance machines current sample method |
| CN108631662A (en) * | 2018-05-11 | 2018-10-09 | 莱克电气股份有限公司 | A kind of method, apparatus and system of switched reluctance machines braking |
| CN108631662B (en) * | 2018-05-11 | 2021-08-24 | 莱克电气股份有限公司 | Method, device and system for braking switched reluctance motor |
| CN110729931A (en) * | 2019-10-17 | 2020-01-24 | 中国计量大学 | Direct-current boost variable-excitation LC less-switching-tube switch reluctance generator current conversion system |
| CN110677084A (en) * | 2019-10-17 | 2020-01-10 | 中国计量大学 | Direct-voltage-boosting self-excitation-changing switched reluctance generator current transformation system |
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Application publication date: 20160210 |
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