CN100495867C - Low-voltage started high-voltage generated three-phase asynchronous motor DC power generation system - Google Patents
Low-voltage started high-voltage generated three-phase asynchronous motor DC power generation system Download PDFInfo
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- CN100495867C CN100495867C CNB2007100210048A CN200710021004A CN100495867C CN 100495867 C CN100495867 C CN 100495867C CN B2007100210048 A CNB2007100210048 A CN B2007100210048A CN 200710021004 A CN200710021004 A CN 200710021004A CN 100495867 C CN100495867 C CN 100495867C
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- 238000010586 diagram Methods 0.000 description 6
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Abstract
A kind of three-phase asynchronism motor direct current starting generate electricity system that is started in low voltage and generates electricity in high voltage includes three phase asynchronism motor, starting power source and main loop power switch converter, it characterized in that said main loop power switch converter includes two three-phase inversion bridges, thereinto the midpoint of three bridge arms of three-phase inversion bridges whose one direct current generatrix is connected with the starting power source is connected with three leading-out terminals of three-phase winding of asynchronism motor, the midpoint of three bridge arms of three phase inversion bridges whose another direct current generatrix is connected with the starting power source is connected with three leading-out terminals of three-phase winding in another side of asynchronism motor, power switch composes connection of starting in low voltage 'Delta', connection of generating in high voltage 'Y', direct current generatrix of two three-phase inversion bridges are parallel connected with conversion switch, the starting running is parallel connected, generating running is cut off. The system resolves contradiction of starting in low voltage and generating in high voltage, and applied in independent power system such as avigation, chariot, and shipping.
Description
One, technical field
Asynchronous machine high voltage direct current starting-generating of the present invention system belongs to starting/generator, is applied to independent electric power supplies such as aviation, battlebus, boats and ships.
Two, background technology
A critical component in the starting/generating dual function system is a motor, and is current, has the motor of types such as brushless synchronous machine, switched reluctance machines and asynchronous machine to be developed to the starting-generating motor.Wherein but squirrel cage induction motor reliable, easy care high-speed cruising firm in structure is more and more paid close attention to by people based on the starting/generating dual function system of asynchronous machine.The expert in 1997-2000 U.S. NASALewis research center and some scholars write articles in IEEE magazine and meeting continuously according to the result of preceding more than ten years research, and recommending asynchronous machine is aviation starting/generating system motor.In the research report of automobile start/electricity generation system and hybrid power, asynchronous machine is made the starting-generating motor by a large amount of the employing.After having compared switched reluctance machines and asynchronous machine, adopted asynchronous machine as industrial group of U.S. Ford Motor.Compare with external comprehensively research, domesticly launch in the research aspect the independent electric power supply of asynchronous machine.
Although the ability of electronic/generating reversible operation that asynchronous machine has in essence, but, same motor has bigger different often in electronic and the operating mode of generator operation, this makes that the difficulty of design starting/generating dual function system is bigger, show: during starting, motor is in the following low regime of dynamo ignition speed, and power supply is generally low pressure (as the 48V storage battery); Machine operation is in big electric current, output high torque (HT); During generating, motor is in the high velocity that is much higher than engine ignition speed, and it requires to satisfy the high-quality requirement of power supply sound attitude, and system's generating voltage is high pressure (as the 270V high voltage direct current), and these two is conflicting often.Therefore, starting/generating dual function system is different from general electronic/generating reversible operation, and technology content is higher, realizes that difficulty is big.
Three, summary of the invention
The object of the present invention is to provide a kind of motor low pressure starting and high-voltage power of solving to export conflicting asynchronous machine high voltage direct current starting-generating system.
The three-phase asynchronous motor DC starting-generating system of this low pressure starting high-voltage power, comprise threephase asynchronous machine, startup power supply and main circuit switching power converter, it is characterized in that, described main circuit switching power converter comprises two three phase inverter bridges, three brachium pontis mid points of the three phase inverter bridge that one of them dc bus links to each other with startup power supply link to each other with three leading-out terminals of asynchronous machine three phase windings one side, three brachium pontis mid points of the three phase inverter bridge that another dc bus is connected with load link to each other with three leading-out terminals of asynchronous machine three phase winding opposite sides, and the straight line bus of two three phase inverter bridges is by the parallel with one another or disjunction of change over switch.When realizing the asynchronous machine starting operation by power switch, three phase windings of motor adopt " Δ " type connection, and when asynchronous machine changed generator operation over to, three phase windings of motor converted " Y " type connection automatically to.Its operation principle is, when the asynchronous machine starting operation, and the change over switch closure, two three phase inverter bridge parallel operations, per two brachium pontis are by identical pwm pulse control, and motor three phase windings are by " Δ " type connection work, because phase voltage equals line voltage, phase voltage " Y " type connection wants high
Doubly, start to the condition of engine ignition speed satisfied, required bus direct voltage is lower, be adapted to the low tension battery power supply, and two three phase inverter bridge parallel operations, the big electric current when sharing starting operation has jointly so just been realized the low pressure starting of motor; When asynchronous machine changes generator operation work over to by the starting operation stage, change over switch is in open mode, motor three phase windings convert " Y " type connection that is suitable for generator operation to by the power switch of three phase inverter bridge, the three phase inverter bridge that is connected between load and the asynchronous machine three-phase winding terminal carries out the PWM control of generator, has so just realized the high pressure output of motor.
Four, description of drawings
Designation among Fig. 1: B
1-B
6Be the brachium pontis of phase inverter bridge, K is a change over switch.
Accompanying drawing 2 is that the electric motor starting operation is motor three phase windings " Δ " type connection schematic diagram.
Accompanying drawing 3 is that the electric power generation operation is motor three phase windings " Y " type connection schematic diagram.
Designation among accompanying drawing 2 and Fig. 3, U
Dc, output dc voltage, C, electric capacity, i
Sai
Sbi
ScBe respectively A phase, B phase and C phase current mutually, U
SaU
SbU
ScBe respectively A phase, B phase and C phase voltage mutually.
Accompanying drawing 4 is asynchronous machine starting process direct Torque Control structural representations.
Accompanying drawing 5 (a) is the voltage vector schematic diagram of motor three phase windings " Y " type connection.
Accompanying drawing 5 (b) is the schematic vector diagram of motor three phase windings " Δ " type connection
Accompanying drawing 6 is asynchronous machine power generation process instantaneous torque control system structural representations.
Designation in above-mentioned accompanying drawing 4 and the accompanying drawing 6: W
s-stator rotating speed, ψ
s-stator magnetic linkage, ψ
r-rotor flux, T
e *-given torque, T
e-electromagnetic torque, U
Dc-output dc voltage, θ
n-sector number, θ-flux linkage vector and reference coordinate axle clamp angle, the ψ magnetic linkage is relatively exported, and the τ torque ratio is output, U
sVoltage vector under equivalence two phase coordinates, i
sCurrent phasor under equivalence two phase coordinates, S
a, S
b, S
cThe expression on off state.
Five, embodiment
Accompanying drawing 1 is a main circuit topological structure schematic diagram of the present invention, and the structure of this circuit comprises asynchronous machine, startup power supply and main circuit switching power converter.Wherein the main circuit switching power converter comprises two three phase inverter bridges, and wherein the three phase inverter bridge in circuit left side is by Bridge 1 arm B
1, Bridge 2 arm B
2With the 3rd brachium pontis B
3Three brachium pontis form, this three phase inverter bridge is output with the dc bus, is connected in load, supplies with the high voltage direct current electric energy, three brachium pontis mid points are connected in three leading-out terminals of asynchronous machine three phase windings one end; The three phase inverter bridge on circuit right side is by the 4th brachium pontis B
4, the 5th brachium pontis B
5With the 6th brachium pontis B
6Three brachium pontis form, the dc bus of this three phase inverter bridge is connected in startup power supply, and three brachium pontis mid points are connected in three leading-out terminals of three winding other ends of asynchronous machine, and two outputs that are characterized in two three phase inverter bridges are by the parallel with one another or disjunction of change over switch K.When asynchronous machine was made starting operation, change over switch K was in closure state, two three phase inverter bridge parallel operations, and the big electric current when sharing starting, control mode is Bridge 1 arm B
1With Bridge 2 arm B
2, the 3rd brachium pontis B
3With the 4th brachium pontis B
4, the 5th brachium pontis B
5With the 6th brachium pontis B
6All parallel operation is controlled by identical pwm pulse, and three windings of motor " Δ " type connection mode is as shown in Figure 2 worked, because phase voltage equals line voltage, phase voltage " Y " type connection has improved
Doubly, satisfying electric motor starting to the condition of engine ignition speed, required bus direct voltage is lower, has realized the low pressure starting of motor.When asynchronous machine was done generator operation work, change over switch K was in open mode, and three windings of motor are worked the 4th brachium pontis B of circuit right side three phase inverter bridge by " Y " type connected mode that power switch is converted to as shown in Figure 3
4, the 5th brachium pontis B
5With the 6th brachium pontis B
6The last switching tube of brachium pontis turn-off, switching tube is opened (zero vector 000) down, the Bridge 1 arm B of circuit left side three phase inverter bridge
1, Bridge 2 arm B
2With the 3rd brachium pontis B
3Carry out the PWM control of generator, realized the high pressure output of motor.
Existing control technology method is all adopted in the starting operation control of native system and generator operation control.
The control system structure of starting process as shown in Figure 4.Detect busbar voltage, stator current, carry out 3/2 coordinate transform, estimate the stator magnetic linkage and the torque of motor, stagnant chain rate by magnetic linkage and torque again, according to the switch list that presets, preferred suitable voltage vector is realized the control to magnetic linkage and torque in different sectors.According to the direct torque control technology implementation characteristics in the Δ connection motor in the starting process.When motor changed the Δ connection into from the Y type, voltage vector, current phasor, magnetic linkage and torque calculation method were all wanted corresponding change.
During the operation of threephase asynchronous machine convertor controls, as shown in table 1 no matter motor according to the different on off states of converter, all has eight voltage vectors for Y type or the connection of Δ type, represent shown in Fig. 5 (a) and Fig. 5 (b) on the alpha-beta plane.Compare with the motor that the Y type is connected, the characteristics of the voltage vector that the Δ type connects are: 1. the amplitude of effective voltage vector has increased
Doubly, can when starting, low pressure reach high rotational speed and bigger torque; 2. Dui Ying effective voltage vector has all moved 30 counterclockwise
0
Table 1 Y type is connected the voltage vector of motor with the Δ type
When implementing the direct torque control of Δ type connection motor, because of 6 effective voltage vectors with respect to having moved 30 counterclockwise in the motor of Y connection
0, notice that the sector divides difference is arranged, and it is also different to calculate the formula of magnetic linkage according to the voltage vector of on off state decision.It is identical with the stagnant ring controlling unit of torque that Y type, Δ type connect magnetic linkage, and the preferred switch list of voltage vector is identical.
Starting operation finishes, the engine ignition running, and system changes to " Y " connection generator operation.Generator operation control strategy structure as shown in Figure 6.When load variations takes place when, voltage regulator is according to the variation of detected bearing power (the output voltage electric current is long-pending) and the deviation of voltage and given voltage, the given torque of output generator, the former is used for the torque feed-forward regulation, and the latter is used for PI and regulates to guarantee voltage accuracy.But the variation of given torque reflected load power, problem are the electromagnetic torque T that must control generator
eCatch up with this variation, The faster the better.The fastest way of known change electromagnetic torque is the direct torque control technology.This torque control technology is transformed in the asynchronous machine generator operation of converters control, for the purpose of difference, is called " the instantaneous torque control technology of asynchronous generator " (having obtained patent of invention).The division of sector and voltage vector are " Y " connection form during generator operation, and torque is given as negative.Change electromagnetic torque fast by the preferable space voltage vector, make system satisfy the requirement of instantaneous torque control technology.Electromagnetic torque by the Instantaneous Control motor comes the energy converting between mechanical of dynamic adjustments motor and the balance of load, keeps the constant of system's output voltage, and this is the basic place of asynchronous generator instantaneous torque control strategy.
Claims (1)
1, a kind of three-phase asynchronous motor DC starting-generating system of low pressure starting high-voltage power, comprise threephase asynchronous machine, startup power supply and main circuit switching power converter, it is characterized in that, described main circuit switching power converter comprises two three phase inverter bridges, the mid point of three brachium pontis of the three phase inverter bridge that one of them dc bus links to each other with startup power supply links to each other with three leading-out terminals of asynchronous machine three phase windings one side, three brachium pontis mid points of the three phase inverter bridge that another dc bus is connected with output loading link to each other with three leading-out terminals of asynchronous machine three phase winding opposite sides, constituting low pressure starting " Δ " by the power switch in the main circuit switching power converter connects, high-voltage power " Y " connects, the dc bus of two three phase inverter bridges is parallel with one another by change over switch, the starting operation parallel connection, the generator operation disjunction.
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| CNB2007100210048A CN100495867C (en) | 2007-03-22 | 2007-03-22 | Low-voltage started high-voltage generated three-phase asynchronous motor DC power generation system |
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| CNB2007100210048A CN100495867C (en) | 2007-03-22 | 2007-03-22 | Low-voltage started high-voltage generated three-phase asynchronous motor DC power generation system |
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| CN100495867C true CN100495867C (en) | 2009-06-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102006000B (en) * | 2010-11-24 | 2012-11-21 | 南京航空航天大学 | Non-directly grid-connected wind driven generator with variable connection type of power winding and method |
| CN102281030A (en) * | 2011-07-23 | 2011-12-14 | 岳群生 | Triangle-star (Y) starting method of low power, asynchronous starting and permanent-magnet synchronous motor |
| TWI470921B (en) * | 2013-01-18 | 2015-01-21 | Mobiletron Electronics Co Ltd | Variable structure motor and its switching method |
| TWI607925B (en) * | 2013-08-06 | 2017-12-11 | Mobiletron Electronics Co Ltd | Hybrid system and its operation method |
| WO2016187977A1 (en) * | 2015-05-28 | 2016-12-01 | 刘卫东 | Brushless motor controller capable of reducing starting current |
| CN111009992B (en) * | 2019-12-05 | 2021-05-28 | 北京动力机械研究所 | High-low voltage compatible built-in brushless direct current starting power generation system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2567855Y (en) * | 2002-08-01 | 2003-08-20 | 石家庄铁路分局磁山机务段 | Emergency power supply for fuel filling and water filling for IC engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2567855Y (en) * | 2002-08-01 | 2003-08-20 | 石家庄铁路分局磁山机务段 | Emergency power supply for fuel filling and water filling for IC engine |
Non-Patent Citations (2)
| Title |
|---|
| 异步电机起动/发电系统起动向发电的转换研究. 张兰红，胡育文，黄文新.航空学报，第26卷第3期. 2005 |
| 异步电机起动/发电系统起动向发电的转换研究. 张兰红，胡育文，黄文新.航空学报，第26卷第3期. 2005 * |
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Assignee: CCCC Guangzhou Dredging Co., Ltd. Assignor: Nanjing University of Aeronautics and Astronautics Contract record no.: 2010440001079 Denomination of invention: Low-voltage high-voltage generated three-phase asynchronous motor DC power generation system Granted publication date: 20090603 License type: Exclusive License Open date: 20071031 Record date: 20100803 |
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