CN105703689B - The two-way frequency conversion speed-adjusting system of high-power brushless double-fed three level of machine - Google Patents
The two-way frequency conversion speed-adjusting system of high-power brushless double-fed three level of machine Download PDFInfo
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- CN105703689B CN105703689B CN201410686806.0A CN201410686806A CN105703689B CN 105703689 B CN105703689 B CN 105703689B CN 201410686806 A CN201410686806 A CN 201410686806A CN 105703689 B CN105703689 B CN 105703689B
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Abstract
The present invention discloses a kind of two-way frequency conversion speed-adjusting system of three level of high-power brushless double-fed machine, it is characterized in that the system is made of brushless dual-feed motor and the double PWM Alternating Current Governor System two large divisions of three level, the double PWM Alternating Current Governor Systems of three level include brushless dual-feed motor three-level pwm rectification unit and brushless dual-feed motor three-level inverter unit.Every phase bridge arm is using four power device series connection in the double PWM Alternating Current Governor System main circuit structures of three level of the invention, compared with two level main circuit structures, it is smaller that each power device bears voltage, rectifier terminal uses three-level PWM rectifier simultaneously, energy in bidirectional flow may be implemented, energy recovery rate is improved, the energy loss of motor AC speed-regulating system is reduced, is suitably applied high-voltage high-power motor driving occasion.
Description
Technical field
The present invention relates to a kind of frequency conversion speed-adjusting systems of brushless dual-feed motor, in particular to a kind of high-power brushless double-fed
The two-way frequency conversion speed-adjusting system of three level of machine, belongs to automation control and numerical control field.
Background technique
Brushless dual-feed motor (referred to as BDFM) is a kind of novel AC induction motor.Stator terminal has two sets in its structure
The threephase stator winding of mutually independent difference number of pole-pairs, is referred to as power winding and control winding.Respectively by power grid and change
Frequency power power supply.Two sets of stator winding share a set of iron core and without direct electromagnetic couplings.This motor is cancelled in structure
Brush and slip ring, have many advantages, such as that structure is simple, sturdy and durable, power factor is adjustable.Motor has a set of special construction
Rotor windings.Rotor windings use special structure, and brushless dual-feed motor can run on synchronization, a variety of shapes such as asynchronous and double-fed
State, therefore it has broad application prospects in the fields such as AC speed regulating speed-regulating system and variable speed constant frequency generator.Three level are double
The frequency conversion speed-adjusting system power factor of PWM structure is adjustable, it can be achieved that Two-way energy transfer, while having pressure-resistant degree higher, defeated
The advantages that voltage waveform quality is high out is suitable for high-voltage large-capacity Alternating Current Governor System.Currently, to brushless dual-feed motor design and
The research of control method has become research hotspot.But due to the more common AC induction motor of brushless double-fed motor model
Structure is complicated, therefore the exploitation of its Control system architecture and control algolithm has certain difficulty.
Summary of the invention
The object of the invention is that solving the above-mentioned deficiency of the prior art, provided by studying repeatedly with after a large number of experiments
A kind of two-way frequency conversion speed-adjusting system of three level of high-power brushless double-fed machine and its control method.The three-level AC that the present invention uses
It is higher with respect to two level blocks control precision to flow speed control system structure, pressure resistance is more preferable.Rectifier terminal is rectified using three-level pwm simultaneously
Energy in bidirectional flow may be implemented in device, improves energy recovery rate, reduces the energy loss of motor AC speed-regulating system, is suitble to answer
Occasion is driven for high-voltage high-power motor.
The two-way frequency conversion speed-adjusting system of this high-power brushless double-fed three level of machine that the present invention provides, it is characterised in that should
System is made of brushless dual-feed motor and the double PWM Alternating Current Governor System two large divisions of three level, the double PWM AC speed regulating systems of three level
System includes brushless dual-feed motor three-level pwm rectification unit and brushless dual-feed motor three-level inverter unit；
The brushless dual-feed motor three-level pwm rectification unit: Hall sensor, whole including control circuit plate unit
Flow end alternating voltage, current signal conditioning circuit unit, rectifier drive circuit unit；
The brushless dual-feed motor three-level inverter unit: including converter main circuit unit, Hall sensor electricity
Current voltage detection unit, power winding alternating voltage, current signal conditioning circuit unit, control winding alternating voltage, electric current letter
Number conditioning circuit unit, DC terminal voltage detection circuit unit, inverter driving circuit unit；
Wherein the power winding of brushless dual-feed motor connects common frequency power network, and control winding connects Alternating Current Governor System；Exchange
Three-level pwm rectification unit connection common frequency power network and DC terminal capacitor in speed-regulating system, by the AC rectification of common frequency power network
For direct current, detection unit connects common frequency power network collection voltages and current information by Hall sensor, and the signal after acquisition is by letter
The port AD of DSP in DSP control unit is sent into filtering, the amplification of number conditioning circuit, pwm signal needed for DSP calculates rectification,
Pwm signal is sent into driving circuit, and driving circuit controls the turn-on and turn-off of switching device in main circuit according to pwm signal.With reality
Existing AC rectification is the switching process of direct current；
The AC current of common frequency power network, by the filter action of dc-link capacitance, is sent into three level after over commutation
PWM inversion unit, inversion unit are respectively adopted Hall sensor connection power winding terminal and control winding end, acquire power winding
Voltage, the current signal at end, signal are sent into signal conditioning circuit, are sent into the port DSP control unit AD, DSP by filter and amplification
PWM wave signal needed for chip calculates control motor, send pwm signal into driving circuit, driving circuit is controlled according to signal
The turn-on and turn-off of main circuit switch device.To control motor.
Main circuit in the double PWM Alternating Current Governor Systems of three level by three-level pwm rectification unit, DC terminal capacitor cell and
Three-level pwm inversion unit three parts are constituted, and rectify end unit and inversion unit respectively by main circuit unit, driving circuit list
Member, signal deteching circuit unit are constituted.The stator winding end of brushless dual-feed motor is made of power winding and control winding, function
Rate winding is powered by common frequency power network, and control winding is powered by the inversion unit of Alternating Current Governor System.
The main function of main circuit is to realize to convert the alternating current that common frequency power network provides by three-level pwm fairing
Filtering is realized for direct current and by capacitor, and direct current is then rectified into frequency by three-level pwm inverter bridge and voltage can
The alternating current of tune.Circuit mainly includes rectification, filtering and three units of inverter circuit.System, control circuit is divided into rectifier terminal control
Circuit and inversion end control circuit.
Rectifier terminal control circuit is by electric current and voltage detecting circuit, power grid end alternating voltage and electric current before detection rectifies, together
When by signal by conditioning circuit filter and amplification be sent to DSP rectifier control circuit unit .DSP rectifier control circuit unit and pass through
Driving circuit is output signals to realize the control of three-level pwm rectification main circuit.Final realization is whole by common frequency power network alternating current
Stream is direct current.
Input of the direct current by the filter action of capacitor, as three-level pwm inversion unit after over commutation.By three
Electrical level inverter realizes direct current rectification as alternating current needed for control motor.Inversion end Hall sensor acquisition power around
The electric current and voltage of group and control winding.Electric current and voltage signal are fed to DSP control electricity after signal conditioning circuit
Road.Control algolithm is executed in control chip, torque and the magnetic linkage of motor are calculated according to detection electric current and voltage, by comparing it
Error.PWM wave needed for obtaining control motor.
1. inversion unit
Wherein the circuit of inversion unit is divided into diode clamp type three-level inverter circuit, IGBT snubber circuit, fills
The parts such as electric current-limiting circuit.Every phase bridge arm has 4 power devices in main circuit, and 2 clamp diodes are constituted.Pass through power device
Cooperate different on-off actions with clamp diode, so that each bridge arm exports 3 kinds of voltage outputs.
2. driving circuit
The driving circuit of power device using the production of SHARP company, Japan PC929 chip, chip have at a high speed, it is built-in
Short-circuit protection circuit, it is easy to use the features such as, be a kind of than more typical drive circuit chip.Driving current is up to 0.4A；
With high-speed response time；Isolation voltage is up to 4kV, the driving suitable for Small And Medium Capacity IGBT.It is built based on chip PC929
Driving circuit in 1,2 pins of PC929 connect pwm pulse through resistance, 3 pins connect pulse voltage, and 10,14 pins connect power supply
Cathode, anode connects 13 pins, and 12 pins are output stage feeder ear, are generally connect altogether with 13 pins, and 11 pins are output end, through electricity
Hindering R6 driving switch pipe can be through resistance R if power is excessive6Switching tube, 9 pins and its periphery are connect again after connecing amplifying circuit
Circuit constitutes protection circuit, and when faulty generation, 8 pins can export low level signal, and TLP521 internal illumination diode is led
It is logical, high level signal is generated in 3 pins, returns to main control chip.
Voltage-stabiliser tube Z3 is by E point voltage clamping in 9V, when inputting pwm pulse waveform is low level, interior light emitting diodes
Conducting generates high level through 11 pin of optocoupler, and the pressure drop with E point is 15V, through resistance R6Electric current is generated, switching tube is connected.When
When input pwm pulse waveform is high level, Light-Emitting Diode cut-off, the pressure drop of generation -9V between G, E, switching tube cut-off.
3. ac voltage detection circuit
It is raw using lime company in system in order to meet control system to current detecting high speed and high-precision requirement
The Hall current sensor HBC10ES5 of production detects stator current, and current sensor HBC10ES5 is semicircle hollow, conducting wire
It is passed through from intermediate circular hole, current signal can be measured under conditions of electric isolution, it is ensured that circuit safety.When there is electric current to pass through
When, internal component meeting automatic sensing generates voltage signal, by U0OUT pin output, HBC10ES5 is active device, work
It must power before work, 1 pin V in deviceccFor its power supply, 2 pins ground connection, 3 pin direct voltage output signal.
Its operating voltage is ± 15V, frequency bandwidth 0-100kHz.Since the stator phase currents that sensor obtains are that have just
The AC signal of negative value, so needing for the resulting signal of sensor signal to be adjusted between 0-3.3V by voltage increase
It to meet the input standard of the A D interface of DSP, then is sent in the AD conversion module of DSP, there is two-way in motor control panel
Current detecting channel in this way is respectively intended to detection motor A phase and C phase current.
Voltage detecting principle is identical with alternating current testing principle, and it is both what lime company produced that voltage sensor, which uses,
LV28-P Hall voltage sensor, 10~500V of measurement range, primary side rated current are 10mA.
4. DC terminal voltage detection circuit
In main circuit, the stability of DC bus-bar voltage directly affects the performance of switching tube, it is therefore necessary to bus
Voltage acquisition is controlled into controller.Current signal is generally smaller, can be detected with Hall current sensor, and voltage
Signal is bigger, and high performance Hall voltage sensor involves great expense, impracticable.If the voltage signals of several hectovolts through resistance
It is input in controller after partial pressure, filtering processing, if busbar voltage pulsation is larger, easily controller is damaged, therefore in
Between have to power up air bound from.Voltage detecting circuit (Fig. 6) is constituted using linear optical coupling TIL300 and LM324 herein, in main circuit
In, the stability of DC bus-bar voltage directly affects the performance of switching tube, it is therefore necessary to which busbar voltage is collected controller
In be controlled.Current signal is generally smaller, can be detected with Hall current sensor, and voltage signal is bigger, Gao Xing
The Hall voltage sensor of energy involves great expense, impracticable.If the voltage signals of several hectovolts after electric resistance partial pressure, filtering processing
It is input in controller, if busbar voltage pulsation is larger, easily controller is damaged, therefore centre has to power up air bound
From.
By voltage detecting circuit (Fig. 6) it is found that UDCThrough resistance R1、R20 is divided to 3.3V, U1AFor voltage follower, turn
Voltage signal after change passes through U1AAfter improve carrying load ability.U1BFor charge amplifying circuit, voltage signal is defeated after this circuit
Enter TIL300 2 are drawn, 1 pin ground connection, Light-Emitting Diode conducting, TIL300 output coupling voltage signal, by U1CLow-pass filtering
After export.
Compared with prior art, beneficial effects of the present invention:
1. in three level two-way exchange speed-regulating system main circuit structure of brushless dual-feed motor, every phase bridge arm uses four power
Devices in series.Compared with two level main circuit structures, it is smaller that each power device bears voltage, therefore it is big to be more suitable for high pressure
Power occasion.
2. voltage vector is more in three level two-way exchange speed-regulating system of brushless dual-feed motor, therefore inversion unit exports
Waveform it is more preferable.
3. three level two-way exchange speed-regulating system rectification unit of brushless dual-feed motor and inversion unit all use pwm circuit knot
Structure, therefore the four quadrant running of motor may be implemented, it can be realized energy feedback, power factor is close to 1, and harmonic content is more
It is small.
Detailed description of the invention
Fig. 1 is present system structural block diagram；
Fig. 2 is inverter structure circuit diagram of the present invention；
Fig. 3 is power device drive circuit figure of the present invention；
Fig. 4 is alternating current detection circuit figure of the present invention:
Fig. 5 is ac voltage detection circuit figure of the present invention:
Fig. 6 is DC voltage detection circuit figure of the present invention:
Fig. 7 is three level FUZZY ALGORITHMS FOR CONTROL block diagram of brushless dual-feed motor of the present invention.
Specific embodiment
Technical solution of the present invention is specifically described with reference to the accompanying drawing
Fig. 1 is the two-way frequency conversion speed-adjusting system structural block diagram of three level of high-power brushless double-fed machine designed by the present invention,
The system includes brushless dual-feed motor；Brushless dual-feed motor three-level pwm rectification unit: including control circuit plate unit, suddenly
That sensor, rectifier terminal alternating voltage, current signal conditioning circuit unit, rectifier drive circuit unit；Brushless dual-feed motor
Three-level inverter unit: including converter main circuit unit, Hall sensor voltage and current detecting unit, the exchange of power winding
Voltage, current signal conditioning circuit unit, control winding alternating voltage, current signal conditioning circuit unit, DC terminal voltage inspection
Slowdown monitoring circuit unit, inverter driving circuit unit；
As shown in Figure 1, the power winding of brushless dual-feed motor connects common frequency power network, control winding connects AC speed regulating system
System；Three-level pwm rectification unit connection common frequency power network and DC terminal capacitor in Alternating Current Governor System, by the exchange of common frequency power network
Electric rectification is direct current, and detection unit connects common frequency power network collection voltages and current information by Hall sensor, the signal after acquisition
The port AD of DSP in DSP control unit, PWM needed for DSP calculates rectification are sent by the filtering of signal conditioning circuit, amplification
Signal, pwm signal are sent into driving circuit, and driving circuit controls the turn-on and turn-off of switching device in main circuit according to pwm signal.
To realize switching process of the AC rectification as direct current；
The AC current of common frequency power network, by the filter action of dc-link capacitance, is sent into three level after over commutation
PWM inversion unit, inversion unit are respectively adopted Hall sensor connection power winding terminal and control winding end, acquire power winding
Voltage, the current signal at end, signal are sent into signal conditioning circuit, are sent into the port DSP control unit AD, DSP by filter and amplification
PWM wave signal needed for chip calculates control motor, send pwm signal into driving circuit, driving circuit is controlled according to signal
The turn-on and turn-off of main circuit switch device.To control motor.
Fig. 2 is inverter structure circuit diagram, and wherein the specific structure of inverter circuit is divided into diode clamp type three as shown in Figure 2
The parts such as level inverter circuit, IGBT snubber circuit, charging current limiter circuit.Every phase bridge arm has 4 power devices in main circuit
Part, 2 clamp diodes are constituted.Cooperate different on-off actions by power device and clamp diode, so that each bridge arm is defeated
3 kinds of voltage outputs out.
Physical circuit principle and parameter designing are as follows:
Filter capacitor: since three-phase alternating current uses fundamental wave for 50Hz power frequency supply, if the voltage change of input AC electricity
Range is Vmin-Vmax, frequency fluctuation range is fmin-fmax, using DC pulse after the rectified filtering of three-phase alternating current inputThen there is filter capacitor calculation formula:
Wherein, Win=Pin/3fmin, in formula, Pin=Pout/ η, Pin、PoutIt is respectively inverter input power, output work with η
Rate, system effectiveness.If f variation range is 47.5~52.5Hz, V fluctuation range is 323-437V.Numerical value substitution above formula, which is obtained C, is
1754uF, it is contemplated that system power is larger, to be preferably rectifier filtering, provides steady dc voltage, keeps dividing as far as possible
Voltage capacitance neutral-point potential balance, and two capacitors are to be connected in series, and taking two derided capacitors C4, C11 is respectively 3300uF, resistance to
It presses and 450V can be selected.
Charging current limiter circuit design: in order to avoid excessive to damage rectification in powered on moment filter capacitor charging current
Pipe is charged using current-limiting resistance R1 to capacitor C4, C11.In conjunction with capacitance, charging time, charging current design, take current limliting electric
Hindering R1 is 50, power 100W.When frequency converter works normally, since DC bus current is larger, resistance accesses straight for a long time
It flows back to Lu Zhonghui and generates pressure drop, inverter output voltage amplitude may be will affect, the foundation of motor-field is influenced, so as to cause electricity
Magnetic torque pulsation.Contactor KM1 is accessed, by current-limiting resistance short circuit after i.e. frequency converter is started to work after the completion of capacitor charging, is kept away
Exempt from above problem generation.
Inverter circuit design: inverter circuit uses NPC three-level inverter topology structure, by the way of diode clamp
Neutral point output voltage relative to DC partial voltage capacitor has 3 kinds of varying levels.Wherein each component parameters are designed below,
It mainly include clamp diode, IGBT switching device
The determination of clamp diode: motor is set using star-like connection, the every phase output electric current of inverter is rated current of motor.
When output level is 0 level, no matter motor is in electric model or regeneration mode flows separately through the flat of two clamp diodes
Equal electric current is rated current, and as 10A considers to select the clamp diode for continuing that forward current is 15A there are certain allowance,
Highest pressure resistance is half, that is, Udc/2 of DC bus-bar voltage.
The design of RCD buffer circuit: in order to preferably protect IGBT to eliminate peak voltage pulse shock when opening with shutdown,
Design is based on charge and discharge type RCD absorbing circuit, is particularly suitable in large-power occasions application.
Protect process analysis procedure analysis.Turn off process: when IGBT shutdown, both end voltage rises from the on state of pressure drop very little
It is Udc/2 off state to pressure resistance, to avoid voltage increase rate, cuts down peak voltage pulse, be connected in parallel on the both ends IGBT at this time
Cs, D1 series circuit give capacitor Cs charging, the overlapping of raised voltage and drop-out current is reduced, to reduce the pass of IGBT
Breakdown consumption.Opening process: both end voltage declines when opening, and circuit RsCs discharges to IGBT, and it is fast to advantageously allow switching tube in this way
Fast conducting electric current climbing speed increases, and reduces switching tube turn-on time, to reduce switching loss.
The determination of capacitor Cs: charging capacitor Cs is determined in turn off process, turns off energy are as follows:
It can be released by above formula:
Wherein, IcMaximum collector current, VceFor collector and emitter voltage, tr、tfRespectively collector maximum rises
Time, maximum fall time.
Resistance RSDetermination: the capacitor C when IGBT is openedSIt needs to discharge by the circuit RC, to prevent from burning out switch
Pipe, it is desirable that the sum of maximum discharge current and operating current should be less than the rated current of switching tube.If by 3 times of capacitors electric discharge constants
Shi Fang electricity is completed, as long as the determination of discharge process time has all been discharged before meeting the shutdown moment arriving of next cycle switching tube
At, i.e., not under the influence of a period capacitor charging, can be determined according to the switch periods time.Meet 3RsCs=ton,
The selection of ton can be determined according to switching frequency, if switching frequency is 5kHz, taking buffer resistance is 10k Ω.
Fig. 3 is power device drive circuit figure, and the driving circuit of power device is using the production of SHARP company, Japan
PC929 chip, chip have the characteristics that high speed, built-in short-circuit protection circuit, easy to use, are a kind of than more typical driving electricity
Road chip.Driving current is up to 0.4A；With high-speed response time；Isolation voltage is up to 4kV, is suitable for Small And Medium Capacity IGBT
Driving.Fig. 3 is the driving circuit built based on chip PC929, and 1,2 pins of PC929 connect pwm pulse through resistance, and 3 pins connect
Pulse voltage, 10,14 pins connect the cathode of power supply, and anode connects 13 pins, and 12 pins are output stage feeder ear, generally with 13
Pin connects altogether, and 11 pins are that output end, can be through resistance R if power is excessive through resistance R6 driving switch pipe6Connect amplification electricity
Lu Houzai connects switching tube, and 9 pins and its peripheral circuit constitute protection circuit, and when faulty generation, 8 pins can export low level
Signal, the conducting of TLP521 internal illumination diode generate high level signal in 3 pins, return to main control chip.
Voltage-stabiliser tube Z3 is by E point voltage clamping in 9V, when inputting pwm pulse waveform is low level, interior light emitting diodes
Conducting generates high level through 11 pin of optocoupler, and the pressure drop with E point is 15V, through resistance R6Electric current is generated, switching tube is connected.When
When input pwm pulse waveform is high level, Light-Emitting Diode cut-off, the pressure drop of generation -9V between G, E, switching tube cut-off.
Fig. 4 is alternating current detection circuit, and Fig. 5 is ac voltage detection circuit, is examined to meet control system to electric current
High speed and high-precision requirement are surveyed, is detected in system using the Hall current sensor HBC10ES5 of lime company production
Stator current, current sensor HBC10ES5 are that semicircle is hollow, and conducting wire is passed through from intermediate circular hole, can be in the item of electric isolution
Current signal is measured under part, it is ensured that circuit safety.When a current passes through, internal component can automatic sensing generation voltage letter
Number, by U0OUT pin output, HBC10ES5 is active device, must power before work, 1 pin V in deviceccIt powers for it
Power supply, 2 pins ground connection, 3 pin direct voltage output signal
Its operating voltage is ± 15V, frequency bandwidth 0-100kHz.Since the stator phase currents that sensor obtains are that have just
The AC signal of negative value, so needing for the resulting signal of sensor signal to be adjusted between 0-3.3V by voltage increase
It to meet the input standard of the A D interface of DSP, then is sent in the AD conversion module of DSP, voltage detecting schematic diagram such as Fig. 5
Shown, current detection circuit schematic diagram is respectively intended to as shown in figure 4, there is the such current detecting channel of two-way in motor control panel
Detect motor A phase and C phase current.Fig. 5 voltage detecting principle is identical with alternating current testing principle, and voltage sensor, which uses, is both
The LV28-P Hall voltage sensor of lime company production, 10~500V of measurement range, primary side rated current are 10mA.
As shown in Figure 5, UDCThrough resistance R1、R20 is divided to 3.3V, U1AVoltage signal for voltage follower, after conversion
By U1AAfter improve carrying load ability.U1BFor charge amplifying circuit, voltage signal inputs the 2 of TIL300 after this circuit and draws,
1 pin ground connection, Light-Emitting Diode conducting, TIL300 output coupling voltage signal, by U1CIt is exported after low-pass filtering.
Fig. 6 is DC voltage detection circuit, and in main circuit, the stability of DC bus-bar voltage directly affects switching tube
Performance, it is therefore necessary to busbar voltage is collected in controller and is controlled.Current signal is generally smaller, uses Hall current
Sensor can detect, and voltage signal is bigger, and high performance Hall voltage sensor involves great expense, impracticable.If
The voltage signal of several hectovolts is input in controller after electric resistance partial pressure, filtering processing, easily right if busbar voltage pulsation is larger
Controller damages, thus centre have to power up air bound from.Voltage is constituted using linear optical coupling TIL300 and LM324 herein to examine
Slowdown monitoring circuit, circuit diagram is as indicated with 6.
In main circuit, the stability of DC bus-bar voltage directly affects the performance of switching tube, it is therefore necessary to bus
Voltage acquisition is controlled into controller.Current signal is generally smaller, can be detected with Hall current sensor, and voltage
Signal is bigger, and high performance Hall voltage sensor involves great expense, impracticable.If the voltage signals of several hectovolts through resistance
It is input in controller after partial pressure, filtering processing, if busbar voltage pulsation is larger, easily controller is damaged, therefore in
Between have to power up air bound from.
Fig. 7 is three level FUZZY ALGORITHMS FOR CONTROL block diagram of brushless dual-feed motor, electric current, voltage acquisition module, flux observer
With torque observer, voltage reconstruction unit, speed pi regulator and the modules such as magnetic linkage Fuzzy Controller and torque Fuzzy Controller
Deng composition.Modular concept is similar with three level Direct Torque algorithms, uses fuzzy control method in magnetic linkage and torque governing loop
Replace traditional stagnant ring comparative approach.In fuzzy control, eψAnd eTRespectively stator magnetic linkage error and electromagnetic torque error, i.e., Midpoint potential deviationIn formula:For stator magnetic linkage reference input；
For torque reference input.Square reference input；Average value is given for midpoint potential；VmFor midpoint potential measured value.By eψ, eT, em
And stator magnetic linkage angular position thetaψAs the input of fuzzy controller, through blurring, rule-based reasoning, ambiguity solution, export as inverter
Switch state signal is output to NPC three-level inverter, driving motor operation.
Claims (3)
1. a kind of two-way frequency conversion speed-adjusting system of three level of high-power brushless double-fed machine, it is characterised in that the system is by brushless double feed
Motor and the double PWM Alternating Current Governor System two large divisions compositions of three level, the double PWM Alternating Current Governor Systems of three level include brushless double
Generating aid three-level pwm rectification unit and brushless dual-feed motor three-level inverter unit；
The brushless dual-feed motor three-level pwm rectification unit: including control circuit plate unit, Hall sensor, rectifier terminal
Alternating voltage, current signal conditioning circuit unit, rectifier drive circuit unit；
The brushless dual-feed motor three-level inverter unit: including converter main circuit unit, Hall sensor voltage electricity
Flow detection unit, power winding alternating voltage, current signal conditioning circuit unit, control winding alternating voltage, current signal tune
Manage circuit unit, DC terminal voltage detection circuit unit, inverter driving circuit unit；
Wherein the power winding of brushless dual-feed motor connects common frequency power network, and control winding connects Alternating Current Governor System；AC speed regulating
Three-level pwm rectification unit connection common frequency power network and DC terminal capacitor in system, are straight by the AC rectification of common frequency power network
Galvanic electricity, detection unit connect common frequency power network collection voltages and current information by Hall sensor, and the signal after acquisition passes through signal tune
It manages the filtering of circuit, amplify the port AD for being sent into DSP in DSP control unit, pwm signal needed for DSP calculates rectification, PWM believes
Number feeding driving circuit, driving circuit control the turn-on and turn-off of switching device in main circuit according to pwm signal, to realize exchange
It is rectified into the switching process of direct current；
The AC current of common frequency power network, by the filter action of dc-link capacitance, it is inverse to be sent into three-level pwm after over commutation
Become unit, Hall sensor connection power winding terminal and control winding end is respectively adopted in inversion unit, acquisition power winding terminal
Voltage, current signal, signal are sent into signal conditioning circuit, are sent into the port DSP control unit AD, dsp chip by filter and amplification
Pwm signal is sent into driving circuit by PWM wave signal needed for calculating control motor, and driving circuit controls main electricity according to signal
The turn-on and turn-off of way switch device, to control motor；
Main circuit in the double PWM Alternating Current Governor Systems of three level is by three-level pwm rectification unit, DC terminal capacitor cell and three electricity
Flat PWM inversion unit three parts are constituted, and rectifier terminal capacitor cell and three-level pwm inversion unit are respectively by main circuit unit, drive
Dynamic circuit unit, signal deteching circuit unit are constituted, and the alternating current that main circuit provides common frequency power network is whole by three-level pwm
Stream device is converted into direct current and is realized by capacitor and filtered, and direct current is then rectified into frequency by three-level pwm inverter bridge
Rate and the adjustable alternating current of voltage；
The circuit of inversion unit is divided into diode clamp type three-level inverter circuit, IGBT snubber circuit, charging current limiter electricity
Road part, every phase bridge arm is made of 4 power devices, 2 clamp diodes in main circuit, passes through two pole of power device and clamper
Pipe cooperates different on-off actions, so that each bridge arm exports 3 kinds of voltage outputs；
The charging current limiter circuit includes current-limiting resistance R1 and contactor KM2 parallel with one another；The parallel circuit is connected to rectification
Between pipe and filter capacitor, contactor KM2 is accessed, by current-limiting resistance short circuit after the completion of capacitor charging；And two filters mutually contacted
Wave capacitor C4, C11 equal 3300 μ F of value, pressure voltage 450V；
The IGBT snubber circuit uses RCD buffer circuit comprising the resistance Rs and capacitor Cs mutually to contact, and the electricity
It is in parallel with diode Ds to hinder Rs；The RCD buffer circuit is for protecting IGBT to eliminate peak voltage pulse punching when opening with shutdown
It hits；
The DC terminal voltage detection circuit unit include operational amplifier LM324, linear optical coupling TIL300, Udc through resistance R1,
R2 is divided to 0 to 3.3V, and LM324 chip U1A is voltage follower, and the voltage signal after conversion improves bringing onto load after U1A
Ability, then accessing LM324 chip U1B, U1B is charge amplifying circuit, and voltage signal inputs the 2 of TIL300 after this circuit and draws
Foot, 1 pin ground connection, LEDs ON, TLI300 output coupling voltage signal export after U1C low-pass filtering.
2. the two-way frequency conversion speed-adjusting system of three level of high-power brushless double-fed machine according to claim 1, it is characterised in that
The stator winding end of brushless dual-feed motor is made of power winding and control winding, and power winding is powered by common frequency power network, control
Winding is powered by the inversion unit of Alternating Current Governor System.
3. the two-way frequency conversion speed-adjusting system of three level of high-power brushless double-fed machine according to claim 1, it is characterised in that
The driving circuit of power device is using the PC929 chip of SHARP company, Japan production, and wherein 1,2 pins of PC929 connect through resistance
Pwm pulse, 3 pins connect pulse voltage, and 10,14 pins connect the cathode of power supply, and anode connects 13 pins, and 12 pins are output stage
Feeder ear connects altogether with 13 pins, and 11 pins are output end, connects if power is excessive through resistance R6 through resistance R6 driving switch pipe
Switching tube is connect after amplifying circuit again, 9 pins and its peripheral circuit constitute protection circuit, and when faulty generation, 8 pins can be exported
Low level signal, the conducting of TLP521 internal illumination diode generate high level signal in 3 pins, return to main control chip.
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| CN107070335B (en) * | 2016-12-30 | 2019-05-24 | 湖南大学 | Double PWM permanent magnetism power-driven system torque feed forward control methods and its control device |
| CN106787812A (en) * | 2017-02-23 | 2017-05-31 | 青岛天信电气有限公司 | A kind of mining permagnetic synchronous motor frequency converter |
| CN108988733A (en) * | 2017-05-31 | 2018-12-11 | 徐州安邦信汽车电机科技有限公司 | Vector-control frequency converter for motor |
| CN109391197A (en) * | 2017-08-10 | 2019-02-26 | 深圳市道通智能航空技术有限公司 | Circuit for controlling motor, electric system, electricity is adjusted and unmanned plane |
| US10374533B2 (en) * | 2017-11-21 | 2019-08-06 | Infineon Technologies Austria Ag | Block commutation to reduce inverter losses for BLDC drives |
| CN112072969B (en) * | 2020-09-09 | 2022-09-27 | 北京金自天正智能控制股份有限公司 | Three-level double-PWM frequency converter driven synchronous motor rectification inversion coordination control method |
| CN112564466A (en) * | 2020-12-05 | 2021-03-26 | 青岛鼎信通讯股份有限公司 | IGBT turn-off spike suppression circuit of low-voltage static var generator |
| CN113708647A (en) * | 2021-08-30 | 2021-11-26 | 西安铁路职业技术学院 | Frequency conversion-power frequency combined driving system for large and medium-sized equipment |
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| CN202586867U (en) * | 2011-12-20 | 2012-12-05 | 东北大学 | Brushless double-fed motor control device |
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| CN202586867U (en) * | 2011-12-20 | 2012-12-05 | 东北大学 | Brushless double-fed motor control device |
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| 一种改进式无刷双馈电机三电平直接转矩控制算法;刘岩;《东北大学学报（自然科学版）》;20140131;第35卷(第1期);第15-19页 |
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