CN104660130B - A kind of error-tolerance type Instantaneous torque control asynchronous machine power generation system and its control method - Google Patents
A kind of error-tolerance type Instantaneous torque control asynchronous machine power generation system and its control method Download PDFInfo
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Abstract
The invention provides a kind of error-tolerance type Instantaneous torque control asynchronous machine power generation system and its control method, including main circuit, initial excitation circuit, detection circuit and control circuit；Main circuit includes asynchronous machine, fault-tolerant code converter, the first bus capacitor, the second bus capacitor；Fault-tolerant code converter is made up of three-phase bridge arm and a bidirectional thyristor；Asynchronous machine power generation system is changed into the switch converters of two-phase four in fault-tolerant rear fault-tolerant code converter from the switch converters of three-phase six, as long as redesigning new optimal voltage vector selection table according to the characteristics of four switch converters voltage vector of two-phase, may continue to realize quick control to asynchronous machine power generation system instantaneous torque, make it is fault-tolerant after asynchronous machine power generation system keep that control algolithm is simple, the good advantage of small, dynamic characteristic is influenceed by the parameter of electric machine.The present invention is reasonable in design, circuit structure is simple, and cost increase is limited, substantially increases the functional reliability of asynchronous machine power generation system.
Description
Technical field
The present invention relates to a kind of error-tolerance type Instantaneous torque control asynchronous machine power generation system and its control method, it is adaptable to right
Generating reliability requires higher occasion, belongs to motor control technology field.
Background technology
The asychronous motor electricity generation system being bonded by converters and asynchronous machine, using advanced control
Technology processed, performance is greatly improved compared with conventional asynchronous generator, thus it turns into the Novel machines such as aircraft, automobile, tank
Load, the ideal chose of vehicle-mounted independent electric power supply.
As the power-supply system applied in aviation, military affairs, reliability is that the problem of must take into consideration first, fault-toleranr technique is to carry
The strong guarantee of high reliability.In the new power generating system being bonded by converters and asynchronous machine, electric power electricity
Sub- converter can substantially improve electricity generation system performance, but it is also the weak link easily broken down in system.Once generation event
Barrier, whole electricity generation system will lose the ability of normal work, and this can bring economic loss in general civilian occasion, and aviation,
The important events such as military affairs, will cause catastrophic failure, therefore carry out electricity generation system fault-tolerance study to have important practical significance.
Using the asynchronous machine power generation system of Instantaneous torque control because dynamic property is particularly excellent, in impact, dash forward and unload negative
Dynamic- Recovery time during load is less than the 30ms of American army mark requirement, and telex system can be met well and senior instrument is not interrupted
The requirement of power supply, thus have application prospect as the independent electrical source electrode of the motion carriers such as aircraft, tank, warship, steamer, award
The Chinese invention patent of power：Squirrel cage induction motor converters DC start/electricity generation system of Instantaneous torque control, it is public
The number of opening：CN 1396705A, disclose the composition and control method of the asynchronous machine power generation system of Instantaneous torque control, but this is special
Profit has only invented hardware circuit and control method when Instantaneous torque control asynchronous machine power generation system is normally run, do not consider be
The fault tolerant technique of system.
In order to improve the reliability of Instantaneous torque control asynchronous machine power generation system, it is set really to meet aircraft, tank, army
The requirement of the high reliability Work occasion such as warship, steamer, the fault-toleranr technique to the system is studied very necessary.
The content of the invention
It is an object of the invention to provide a kind of required power device is few, hardware circuit is simple, cost is low, reliability is high, energy
Realize power tube open circuit and the fault-tolerant Instantaneous torque control asynchronous machine power generation system of short trouble and its control method.
To achieve the above object, the technical scheme is that：
A kind of error-tolerance type Instantaneous torque control asynchronous machine power generation system, including main circuit, initial excitation circuit, detection electricity
Road and control circuit；
The main circuit includes asynchronous machine, fault-tolerant code converter, the first bus capacitor, the second bus capacitor；Error-tolerance type
Converter includes the first phase bridge arm, the second phase bridge arm, third phase bridge arm and a bidirectional thyristor；First phase bridge arm is melted by first
Disconnected device, the first power tube, the second power tube and second fuse are composed in series, and the second phase bridge arm is by the 3rd fuse, the 3rd work(
Rate pipe, the 4th power tube and the 4th fuse are composed in series, and third phase bridge arm is by the 5th fuse, the 5th power tube, the 6th work(
Rate pipe and the 6th fuse are composed in series；The positive pole of the negative pole of first bus capacitor and the second bus capacitor is connected；Three-phase bridge arm
Positive pole and the first bus capacitor positive pole be connected, the positive pole exported as dc source；The negative pole of three-phase bridge arm and the second mother
The negative pole of line capacitance is connected, the negative pole exported as dc source；Three-phase bridge arm midpoint connects asynchronous machine three-phase windings respectively
Leading-out terminal；Bidirectional thyristor is connected between the tie point of asynchronous machine neutral point and the first bus capacitor and the second bus capacitor；
The initial excitation circuit includes diode and low pressure accessory power supply, the anode of diode and low pressure accessory power supply
Positive pole is connected；The negative electrode of diode connects the positive pole of dc source output, and the negative pole of low pressure accessory power supply connects dc source output
Negative pole；
The detection circuit includes current sensor, voltage sensor, A/D converter, and current sensor is three friendships
Hall current sensor is flowed, three of asynchronous machine three-phase windings output end and fault-tolerant code converter three-phase bridge arm midpoint are connected to
Wire is each passed through three current sensors；Voltage sensor is a direct current Hall voltage sensor, and its input is connected in parallel on
On the positive and negative polar curve of dc source output；Simulation of the output end of current sensor and voltage sensor with A/D converter
Signal input part is connected；The DC voltage that the three-phase alternating current analog signal of current sensor acquisition, voltage sensor are obtained
Analog signal all sends into the input end of analog signal of A/D converter, and A/D converter is converted into numeral by analog signal is inputted
Signal output；
The control circuit includes digital signal processor, drive circuit, the input and analog of digital signal processor
Converter digital signal output part is connected, and its output end is connected with the input of drive circuit, the output end of drive circuit and master
The first power tube of fault-tolerant code converter connects to the grid of the 6th power tube and the control pole of bidirectional thyristor in circuit.
A kind of control method of error-tolerance type Instantaneous torque control asynchronous machine power generation system is that asynchronous machine power generation system is just
Often during operation, three-phase bridge arm work, bidirectional thyristor does not work, and asynchronous machine is by the first power tube in three-phase bridge arm to the 6th
The switch converters of symmetrical three-phase six control that power tube is constituted；
When there is open fault in some power tube of three-phase bridge arm, corresponding current sensor detection in detection circuit
It is zero always in half period to go out the phase current signal, and control circuit disconnects the power tube and its same phase bridge arm complementary power
The drive signal of pipe, while triggering bidirectional thyristor conducting, asynchronous machine is made up of other two-phase bridge arm and bidirectional thyristor
The switch converters of two-phase four are controlled, and continue fault-tolerant generator operation；
When short trouble occurs in some power tube of three-phase bridge arm, the fuse being in series with the power tube is because of excessively stream
And fuse, short trouble is converted into open fault, then is controlled by above-mentioned open-circuit fault of power tubes fault-tolerance approach.
During above-mentioned asynchronous machine power generation system fault-tolerant operation, its Instantaneous torque control method is, first by data signal
Reason device calculates the dc source output electricity required for DC power output voltage and system measured by direct current voltage sensor
Deviation between pressure, the asynchronous machine instantaneous torque size of control required for thereby determining that；Then, digital signal processor according to
Four mutually perpendicular voltage vectors of the switch converters system of two-phase four, the stator magnetic linkage plane of movement of asynchronous machine is divided
Into four equal-sized sectors；Digital signal processor is in each controlling cycle, sector, actual magnetic according to residing for magnetic linkage
The deviation between deviation and actual torque and required control torque between chain and required control magnetic linkage, selects four voltages
One optimal to magnetic linkage and torque adjustment effect in vector, the quick control to asynchronous machine instantaneous torque is realized.
The present invention has following advantageous effects：It is made up of existing the switch converters of three-phase six and asynchronous machine
In electricity generation system, one bidirectional thyristor of increase, six fuses and the hardware driving circuit of IGCT all the way are achieved that pair
The common power tube open circuit of the switch converters of three-phase six and short trouble it is fault-tolerant, its reasonable in design, circuit structure is simple, cost
Increase is limited, substantially increases the functional reliability of asynchronous machine power generation system；Also, asynchronous machine power generation system is after fault-tolerant
Converter is changed into the switch converters of two-phase four from the switch converters of three-phase six, as long as according to the switch converters voltage vector of two-phase four
The characteristics of redesign new optimal voltage vector selection table, so that it may continue realize to asynchronous machine power generation system instantaneous torque
Quick control, make it is fault-tolerant after asynchronous machine power generation system keep that control algolithm is simple, influenceed small, dynamic characteristic by the parameter of electric machine
Good advantage.
Brief description of the drawings
Fig. 1 is schematic diagram of the invention；
Main circuit diagram when Fig. 2 is normal work of the present invention；
Fig. 3 breaks down for one of power tube in the first phase bridge arm of the invention, and it is that two-phase four is switched that converter is fault-tolerant
After converter, the main circuit diagram of system；
Fig. 4 (a) is that one of power tube breaks down in the first phase bridge arm of the invention, fault-tolerant converter is the switch change of two-phase four
After parallel operation, four voltage vectors of system；
Fig. 4 (b) is that one of power tube breaks down in the second phase bridge arm of the invention, fault-tolerant converter is the switch change of two-phase four
After parallel operation, four voltage vectors of system；
Fig. 4 (c) is that one of power tube breaks down in third phase bridge arm of the present invention, fault-tolerant converter is the switch change of two-phase four
After parallel operation, four voltage vectors of system；
Fig. 5 is that one of power tube breaks down in the first phase bridge arm of the invention, fault-tolerant converter is the switch change-over of two-phase four
After device, sector is divided and θ1Voltage vector is to magnetic linkage and the adjustment effect schematic diagram of torque in sector；
Fig. 6 is the normal operation of the present invention and fault-tolerant rear torque reference schematic diagram.
In figure：1 is asynchronous machine, and 2 be fault-tolerant code converter, and 3 be the first bus capacitor, and 4 be the second bus capacitor, and 5 are
Diode, 6 be low pressure accessory power supply, and 7 be current sensor, 8 is voltage sensor, 9 is A/D converter, 10 be numeral letter
Number processor, 11 be drive circuit.2.1 be the first phase bridge arm, and 2.2 be the second phase bridge arm, and 2.3 be third phase bridge arm；T1~T6
For the first~the 6th power tube, F1~F6 is the first~the 6th fuse, and TRn is bidirectional thyristor, ia、ib、icFor motor a, b,
C three-phase currents, UdcFor output DC voltage；V0(00)、V1(01)、V2(10)、V3(11) it is voltage vector；θ1~θ4For stator magnet
Four sectors that chain movement plane is divided equally, ψsFor stator magnetic linkage, ψrFor rotor flux, δ is stator magnetic linkage ψsLag behind rotor flux
ψrAngle；Te *For torque reference value, Te *' be torque reference value filter value.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
A kind of error-tolerance type Instantaneous torque control asynchronous machine power generation system of the present invention, as shown in figure 1, including main electricity
Road, initial excitation circuit, detection circuit and control circuit；
The main circuit is made up of asynchronous machine 1, fault-tolerant code converter 2, the first bus capacitor 3, the second bus capacitor 4；
Fault-tolerant code converter 2 includes three-phase bridge arm 2.1,2.2,2.3 and bidirectional thyristor TRn；First phase bridge arm 2.1 is by first fuse
F1, the first power tube T1, the second power tube T2 and second fuse F2 are composed in series, and the second phase bridge arm 2.2 is by the 3rd fuse
F3, the 3rd power tube T3, the 4th power tube T4 and the 4th fuse F4 are composed in series, and third phase bridge arm 2.3 is by the 5th fuse
F5, the 5th power tube T5, the 6th power tube T6 and the 6th fuse F6 are composed in series；The negative pole and second of first bus capacitor 3
The positive pole of bus capacitor 4 is connected；The positive pole of the positive pole of three-phase bridge arm 2.1,2.2,2.3 and the first bus capacitor 3 is connected, as straight
Flow the positive pole of power supply output；The negative pole of the negative pole of three-phase bridge arm 2.1,2.2,2.3 and the second bus capacitor 4 is connected, and is used as direct current
The negative pole of power supply output；The midpoint of three-phase bridge arm 2.1,2.2,2.3 connects the leading-out terminal of the three-phase windings of asynchronous machine 1 respectively；Two-way crystalline substance
Brake tube TRn is connected between the tie point of the neutral point of asynchronous machine 1 and bus capacitor 3,4；Power tube T1~T6 is to be parallel with body
The IGBT power tubes of diode, fuse F1~F6 is fastp-acting fuse；
The initial excitation circuit includes diode 5, low pressure accessory power supply 6, the anode and low pressure accessory power supply of diode 5
6 positive pole is connected, and its negative electrode connects the positive pole of dc source output；The negative pole of low pressure accessory power supply 6 connects the negative of dc source output
Pole.Low pressure accessory power supply 6 is 12V or 24V batteries, and it passes through three that diode 5 and three-phase bridge arm 2.1,2.2 and 2.3 are constituted
The switch converters of phase six provide initial excitation voltage to asynchronous machine 1, and the voltage that excitation asynchronous machine 1 is sent gradually increases.It is different
The three-phase alternating voltage that step motor 1 is sent passes through the rectification of the switch converters of three-phase six, then by the first bus capacitor 3 and second
The filter action of bus capacitor 4, exports DC voltage；When the DC voltage of output exceedes the voltage of low pressure accessory power supply 6, two
5 blocking effects of pole pipe, make low pressure accessory power supply 6 depart from asynchronous machine power generation system naturally；
The detection circuit includes current sensor 7, voltage sensor 8 and analog-digital converter 9；Current sensor 7 is three
AC Hall current sensor, is connected to asynchronous machine three-phase windings output end and fault-tolerant code converter three-phase bridge arm midpoint
Three wires are each passed through three current sensors 7, and current sensor 7 believes the exchange heavy current of the three-phase windings of asynchronous machine 1
Number ia、ib、icIt is converted into weak voltage analog signal；Voltage sensor 8 is a direct current Hall voltage sensor, and its input is simultaneously
It is associated on the positive and negative polar curve of DC power output end；The output end of current sensor 7 and voltage sensor 8 is and analog/digital conversion
The input end of analog signal of device 9 is connected；The weak voltage analog signal access analog that current sensor 7 is obtained with voltage sensor 8
The input end of analog signal of converter, A/D converter will input analog signal and be converted into data signal output；Passed using electric current
Sensor 7 and voltage sensor 8 can make detection circuit while accurate information detection is carried out, and realize control circuit and main circuit
Reliable electrical isolation；
The control circuit includes digital signal processor 10, drive circuit 11, the input of digital signal processor 10
It is connected with the output end of A/D converter 9, its output end is connected with the input of drive circuit 11；The output of drive circuit 11
End connects with power tube T1~T6 base stage in main circuit and bidirectional thyristor TRn control pole；Digital signal processor 10 according to
Data signal --- three-phase current information and the main circuit information of voltage inputted according to analog-digital converter 9, in Generation of induction motor system
When system is normally run, the instantaneous torque of the electricity generation system constituted according to the existing conventional switch converters of three-phase six and asynchronous machine
Control method, calculating issue the control signal of fault-tolerant code converter, in asynchronous machine power generation system fault-tolerant operation, according to
The Instantaneous torque control method of the electricity generation system of the switch converters of two-phase four and asynchronous machine composition proposed by the present invention, calculating should
This issues the control signal of fault-tolerant code converter；Drive amplification of the control signal of fault-tolerant code converter through overdrive circuit 11,
Six power tube T1~T6 grid and bidirectional thyristor TRn control pole are sent to, the fault-tolerant of asynchronous machine power generation system is carried out
Control.
A kind of control method of error-tolerance type Instantaneous torque control asynchronous machine power generation system of the present invention：
When asynchronous machine power generation system is normally run, its main circuit as shown in Fig. 2 three-phase bridge arm 2.1,2.2,2.3 work,
Bidirectional thyristor TRn does not work, the three-phase alternating current that asynchronous machine 1 is sent, and after the switch converters rectification of three-phase six, is changed into
Direct current electricity output；
When there is open fault in a power tube in a certain phase bridge arm, detection electric circuit inspection to certain in three-phase current
The time that one phase current is zero reaches half of current cycle, and control circuit disconnects the drive of two power tubes in the phase bridge arm accordingly
Dynamic signal, then triggers bidirectional thyristor TRn conductings, and asynchronous machine is made up of other two-phase bridge arm and bidirectional thyristor TRn
The switch converters of two-phase four are controlled, and continue fault-tolerant generator operation.Below with (or the power of power tube T1 in the first phase bridge arm 2.1
Pipe T2) there is open fault exemplified by, as shown in figure 3, control circuit disconnects power tube T1, T2 drive signal, while triggering is double
Turned on to IGCT TRn, the switch of two-phase four being made up of bidirectional thyristor TRn, the second phase bridge arm 2.2 and third phase bridge arm 2.3
Convertor controls asynchronous machine 1 continues generator operation；
When there is short trouble in a power tube in a certain phase bridge arm, complementary power pipe on same phase bridge arm, should
Two fuses and the first bus capacitor 3, the second bus capacitor 4 on bridge arm can form short-circuit loop, two fuses because
Excessively stream is blown, and the bridge arm is disconnected from the circuit, and short trouble is automatically converted to open fault, recycles above-mentioned power tube open circuit
Failure tolerant method is controlled.
Existing Instantaneous torque control method is used when asynchronous machine power generation system is normally run, its general principle is, different
Torque produced by step motor is the basic concept that motor carries out energy converting between mechanical, controls instantaneous torque, just controls
Energy converting between mechanical process during electric power generation, so as to make whole electricity generation system obtain excellent dynamic property.Due to instantaneous
Torque is proportional to the sine value of angle between motor stator and rotor magnetic linkage, and instantaneous torque is controlled rapidly, should change as quickly as possible
The angle of stator and rotor magnetic linkage.Because rotor flux is to be sensed to produce by stator magnetic linkage, its change is for stator magnetic linkage
It is slow, therefore the rapid angle changed between stator and rotor magnetic linkage, realized indeed through stator magnetic linkage is quickly changed.
The method of Instantaneous torque control is the different on off states by selecting converter, that is, electricity generation system different voltages arrow
Amount, is applied directly in machine winding, makes the stator magnetic linkage ψ of motorsRapidly changed, so that the wink of rapid controlled motor
When torque.In control process, to keep high dynamic performance, stator magnetic linkage amplitude | ψs| constant condition, therefore magnetic need to be met
Chain ψsMovement locus for circle.
The Instantaneous torque control that asynchronous machine power generation system is normally run includes two processes of Voltage Establishment and generating voltage-stabilized electricity by use.
Voltage Establishment process includes three phases：One is to enter generating state, under initial excitation circuit function, numeral letter
Number processor is by the selection to the switch converters voltage vector of three-phase six, and controlled motor instantaneous torque is negative, controls stator magnet
Chain amplitude increases with the time, asynchronous machine is entered generating state；Two be that low pressure accessory power supply is exited the stage, Digital Signal Processing
It is negative that device, which continues controlled motor instantaneous torque, makes VD UdcGradually increase, work as UdcMore than low pressure accessory power supply voltage
When, due to the blocking effect of diode 5, low pressure accessory power supply exits electricity generation system naturally；Three be that voltage increases power generating stage, should
Instantaneous torque (also known as torque reference value) T of control needed for stagee *As the VD U measured by voltage sensor 8dc
With VD (also known as voltage set-point) U of required controldc *Deviation adjust that (P represents ratio, I and represented through PID
Integration, D represent differential) obtain：
K in formulap、ki、kdRespectively ratio, integration and differential coefficient.
The instantaneous torque of DSP CONTROL motor follows torque reference value Te *, make voltage UdcIncrease, Zhi Daoyu
The VD U of required controldc *Deviation reach defined error range.
When asynchronous machine power generation system generating voltage-stabilized electricity by use is run, torque reference value Te *Computational methods and electricity during Voltage Establishment
Press the computational methods of build phase identical.
No longer it is shown in Fig. 2 because converter circuit topology is changed during asynchronous machine power generation system fault-tolerant operation
The switch converters mode of three-phase six, and be changed into the switch converters mode of two-phase four, voltage vector is when normal operation compared to hair
Given birth to change, its to stator flux of motor and the adjustment effect of torque with lower normal operation when completely different, therefore voltage vector
Selection scheme to redesign.An important feature of control method is to analyze the fault-tolerant switch of rear two-phase four to become in the present invention
Voltage vector designs new optimal voltage accordingly for motor magnetic linkage and the influence of torque in parallel operation asynchronous machine power generation system
Vector selects table, realizes the quick control to motor magnetic linkage and instantaneous torque, continues the dynamic for keeping fault-tolerant rear system excellent
Energy.The foundation of the fault-tolerant switch converters asynchronous machine power generation system optimal voltage vector selection table of rear two-phase four is control of the present invention
The core of method.
Voltage vector such as Fig. 4 (a), (b), (c) of the fault-tolerant switch converters of rear two-phase four are shown.Fig. 4 (a) is the first phase bridge
One of power tube of arm 2.1 break down and it is fault-tolerant be the switch converters of two-phase four after, the voltage vector of asynchronous machine power generation system,
That now constitute the switch converters of two-phase four is T3, T4, T5, T6, controlled motor b phases and c phase winding current flowings.In Fig. 4 (a)
Four voltage vectors and the corresponding states that power tube is turned on and off are as shown in table 1.
The corresponding states that 1 four voltage vectors of table are turned on and off with power tube
| Voltage vector | T3 | T4 | T5 | T6 |
| V0(00) | Shut-off | Conducting | Shut-off | Conducting |
| V1(01) | Shut-off | Conducting | Conducting | Shut-off |
| V2(10) | Conducting | Shut-off | Shut-off | Conducting |
| V3(11) | Conducting | Shut-off | Conducting | Shut-off |
The switch converters asynchronous machine power generation system voltage vector feature of two-phase four is：There is effective arrow that four amplitudes are not waited
Amount, each vector differs 90 ° successively.
Fig. 4 (b) be in the second phase bridge arm (2.2) power tube break down and it is fault-tolerant be system after the switch converters of two-phase four
Voltage vector, be T1, T2, T5, T6 due to now constitute the switch converters of two-phase four, correspondence controlled motor a phases and c phases around
Group current flowing, thus all voltage vectors in Fig. 4 (a) than falling behind 120 °.Fig. 4 (c) is power in third phase bridge arm 2.3
Pipe breaks down and the fault-tolerant voltage vector for system after the switch converters of two-phase four, and all voltage vectors are than equal in Fig. 4 (b)
Fall behind 120 °.
From Fig. 4 (a), (b), (c), fault-tolerant code converter contains four mutually perpendicular voltage vector V0(00)、V1
(01)、V2(10)、V3(11) magnetic linkage plane of movement, can be divided into according to the relative position of voltage vector by four sectors, with first
The power tube of phase bridge arm 2.1 break down and it is fault-tolerant be the switch converters system of two-phase four exemplified by, magnetic linkage plane of movement is divided into
θ in Fig. 51、θ2、θ3、θ4Four sectors.With θ1Analysis voltage vector is to stator magnetic linkage and the adjustment effect of torque exemplified by sector.
In Fig. 5, continuous circular line represents that stator flux of motor moves the mean place of circular trace, and two circular dashed lines are represented
Stator magnetic linkage movement locus scope.When electric power generation is run, stator magnetic linkage vector ψsLag behind rotor flux linkage vector ψrOne angle
δ is spent, due to V0(00)、V2(10) ψ is madesMoved to the direction for deviateing the round heart of magnetic linkage, therefore the two vectors make | ψs| increase, V1
(01)、V2(10) ψ is madesMoved to close to the direction of the round heart of magnetic linkage, therefore the two vectors make | ψs| reduce；V2(10)、V3
(11) ψ is madesAnd ψrAngle reduce, TeAbsolute value reduces, but T during due to generating electricityeIt is negative, therefore TeNumerical value is actual in increase；V0
(00)、V1(01) ψ is madesAnd ψrBetween angle increase, TeAbsolute value increase, numerical value reduces.In figure ↑ increase is represented, ↓ represent to subtract
It is small.This account for voltage vector is applied in machine winding, can cause the rapid change of stator magnetic linkage and torque, variation tendency and journey
Degree is relevant with the sector residing for stator magnetic linkage, and optimal voltage vector can be directly selected accordingly and is applied in machine winding, meets
The direct torque requirement of system.The fault-tolerant rear switch converters asynchronous machine power generation system instantaneous torque of two-phase four that the present invention is designed
Optimal voltage vector selection table is controlled, as shown in table 2.
The switch converters asynchronous machine power generation system Instantaneous torque control optimal voltage vector of 2 two-phase of table four selects table
| ψ | τ | θ1 | θ2 | θ3 | θ4 |
| 0 | 0 | V2(10) | V3(1) | V1(01) | V0(00) |
| 0 | 1 | V0(00) | V2(10) | V3(11) | V1(01) |
| 1 | 0 | V3(11) | V1(01) | V0(00) | V2(10) |
| 1 | 1 | V1(01) | V0(00) | V2(10) | V3(11) |
ψ or τ is that 0 expression requires that ψ or τ are 1 expression from stator magnetic linkage amplitude or torque increased vector is made in table 2
It is required that selecting makes the vector of stator magnetic linkage amplitude or torque reduction.With θ in Fig. 51Exemplified by sector, if requiring that magnetic linkage and torque are equal
Increase, then optimal voltage vector is V2(10)；If it is required that magnetic linkage increase, torque are reduced, optimal voltage vector is V0(00)；
If it is required that magnetic linkage is reduced, torque increase, optimal voltage vector is V3(11)；If it is required that magnetic linkage and torque are reduced,
Optimal voltage vector is V1(01)。
If with torque reference value T during normal operatione *Computational methods, Te *With DC power output voltage UdcFluctuate and ripple
It is dynamic, T in such as Fig. 6e *, V is sent out in such switch converters system of two-phase four0(00)、V1(01)、V2And V (10)3(11) four voltages
The charge and discharge chance of the chance of vector and time sample different in size, the first bus capacitor 3 and the second bus capacitor 4 is unequal, if
In one current cycle, the charge volume of the first bus capacitor 3 is more than discharge capacity, and the charge volume of the second bus capacitor 4 must be less than discharge capacity,
Accumulation over time, the voltage of the first bus capacitor 3 is to more than Udc/ 2 direction drift, the voltage of the second bus capacitor 4 to less than
Udc/ 2 direction drift, two electric capacity working conditions are uneven.For suppress bus capacitor 3,4 voltage drift, it is fault-tolerant after to two
The torque reference of the switching system of phase four is modified, and reduces the fluctuating range of torque reference, the switch converters system of two-phase four
Torque reference value Te *' be：
Section 1 U in above formuladc' it is that voltage sensor 8 surveys DC voltage UdcDigital filtering value.Te *' still include than
Example, integration and differential three, proportional is to Usc' and required voltage Udc *Error carry out, integration with differential still to surveyed direct current
Electric power output voltage UdcWith required DC power output voltage Udc *Deviation carry out.Te *' change, as shown in phantom in Figure 6.
Relative to Te *For, due to Te *' fluctuation be effectively suppressed, controller hair V0(00)、V1(01)、V2(10) and
V3(11) chance of vector and time length are substantially impartial, and the first bus capacitor 3 and the second bus capacitor 4 obtain basic equalization
Charge and discharge chance, voltage drift is inhibited, and two electric capacity working condition balances, VD is stable, ensure that simultaneously
The excellent dynamic property of system.
Claims (2)
1. a kind of control method of error-tolerance type Instantaneous torque control asynchronous machine power generation system, it is characterised in that：The error-tolerance type
Instantaneous torque control asynchronous machine power generation system includes main circuit, initial excitation circuit, detection circuit and control circuit；
The main circuit includes asynchronous machine, fault-tolerant code converter, the first bus capacitor, the second bus capacitor；Error-tolerance type is converted
Device includes the first phase bridge arm, the second phase bridge arm, third phase bridge arm and a bidirectional thyristor；First phase bridge arm is by the first fusing
Device, the first power tube, the second power tube and second fuse are composed in series, and the second phase bridge arm is by the 3rd fuse, the 3rd power
Pipe, the 4th power tube and the 4th fuse are composed in series, and third phase bridge arm is by the 5th fuse, the 5th power tube, the 6th power
Pipe and the 6th fuse are composed in series；The positive pole of the negative pole of first bus capacitor and the second bus capacitor is connected；Three-phase bridge arm
The positive pole of positive pole and the first bus capacitor is connected, the positive pole exported as dc source；The negative pole of three-phase bridge arm and the second bus
The negative pole of electric capacity is connected, the negative pole exported as dc source；Three-phase bridge arm midpoint meets going out for different motor three-phase windings respectively
Line end；Bidirectional thyristor is connected between the tie point of asynchronous machine neutral point and the first bus capacitor and the second bus capacitor；
The initial excitation circuit includes diode and low pressure accessory power supply, the anode of diode and the positive pole of low pressure accessory power supply
It is connected；The negative electrode of diode connects the positive pole of dc source output, and the negative pole of low pressure accessory power supply connects the negative pole of dc source output；
The detection circuit includes current sensor, voltage sensor, A/D converter, and current sensor is three and exchanged suddenly
That current sensor, is connected to three wires at asynchronous machine three-phase windings output end and fault-tolerant code converter three-phase bridge arm midpoint
It is each passed through three current sensors；Voltage sensor is a direct current Hall voltage sensor, and its input is connected in parallel on direct current
On the positive and negative polar curve of power supply output；Analog signal of the output end of current sensor and voltage sensor with A/D converter
Input is connected；It is described control circuit include digital signal processor, drive circuit, the input of digital signal processor with
A/D converter digital signal output end is connected, and its output end is connected with the input of drive circuit, the output end of drive circuit
Connect with the first power tube of fault-tolerant code converter in main circuit to the grid of the 6th power tube and the control pole of bidirectional thyristor；
When the error-tolerance type Instantaneous torque control asynchronous machine power generation system is normally run, the work of three-phase bridge arm, bidirectional thyristor
Do not work, the switch converters of symmetrical three-phase six that asynchronous machine is made up of the first power tube in three-phase bridge arm to the 6th power tube
Control；
When open fault occurs in some power tube of three-phase bridge arm, corresponding current sensor detects this in detection circuit
Phase current signal is zero always in half period, and control circuit disconnects the power tube and its same phase bridge arm complementary power pipe
Drive signal, while triggering bidirectional thyristor conducting, the two-phase that asynchronous machine is made up of other two-phase bridge arm and bidirectional thyristor
Four switch converters are controlled, and continue fault-tolerant generator operation；
When short trouble occurs in some power tube of three-phase bridge arm, the fuse being in series with the power tube melts because of excessively stream
Disconnected, short trouble is converted into open fault, then is controlled by above-mentioned open-circuit fault of power tubes fault-tolerance approach.
2. a kind of control method of error-tolerance type Instantaneous torque control asynchronous machine power generation system according to claim 1, its
It is characterised by：During above-mentioned error-tolerance type Instantaneous torque control asynchronous machine power generation system fault-tolerant operation, its Instantaneous torque control method
For first as needed for the DC power output voltage and system measured by digital signal processor calculates direct current voltage sensor
Deviation between the DC power output voltage wanted, the asynchronous machine instantaneous torque size of control required for thereby determining that；Then,
Digital signal processor is according to four mutually perpendicular voltage vectors of the switch converters system of two-phase four, by determining for asynchronous machine
Sub- magnetic linkage plane of movement is divided into four equal-sized sectors；Digital signal processor is in each controlling cycle, according to magnetic
Between deviation between sector, actual magnetic linkage and required control magnetic linkage and actual torque and required control torque residing for chain
Deviation, optimal to magnetic linkage and torque adjustment effect one in four voltage vectors of selection, realization instantaneously turns to asynchronous machine
The quick control of square.
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| CN111740661A (en) * | 2020-07-31 | 2020-10-02 | 江苏华力易电科技有限公司 | Frequency conversion alternating current asynchronous generator power supply control system and asynchronous generator with same |
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| CN115800842B (en) * | 2022-12-20 | 2023-05-23 | 南京航空航天大学 | Electric excitation doubly salient motor loss-of-magnetic fault-tolerant power generation control method for optimizing dynamic performance |
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