CN105958836A - AC-DC-AC converter with switching freewheeling capacitor and control method thereof - Google Patents
AC-DC-AC converter with switching freewheeling capacitor and control method thereof Download PDFInfo
- Publication number
- CN105958836A CN105958836A CN201610505248.2A CN201610505248A CN105958836A CN 105958836 A CN105958836 A CN 105958836A CN 201610505248 A CN201610505248 A CN 201610505248A CN 105958836 A CN105958836 A CN 105958836A
- Authority
- CN
- China
- Prior art keywords
- voltage
- electric capacity
- bridge
- converter
- inverter bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention discloses an AC-DC-AC converter with a switching freewheeling capacitor and a control method thereof. A large capacitor in parallel connection with an inverter bridge of a common converter is changed into a small capacitor, and a power switch device with a freewheeling diode is in serial connection with the small capacitor. The capacitor parallelly connected in the topological structure does not filter a direct current output from rectification. When a load has inductance and has a freewheeling current toward a direct current bus end, a voltage of a direct current bus rises, that is, a pump-up voltage is caused. When the pump-up voltage reaches a set threshold voltage, a microcontroller transmits a trigger pulse to trigger a power switch transistor V7 to be on, so as to enable a capacitor C1 to connect to a circuit to form an inductance freewheeling circuit. The topological form of the AC-DC-AC converter reduces the volume of the converter, and lowers the cost, and selection of a sine pulse wide modulation (SPWM)-based control manner and a direct torque control manner realizes high performance of the converter.
Description
[technical field]
The present invention relates to AC and DC hybrid transmission system technical field, particularly to the ac-dc-ac inverter of a kind of belt switch afterflow electric capacity
Device and control method thereof.
[background technology]
The three-phase alternating current of input was passed through and became by the AC and DC hybrid transmission system major function of normal tape afterflow electric capacity before this at present
Frequently the three-phase commutation bridge of device is converted to unidirectional current, and then rectification unidirectional current out is converted to hand over through converter three phase inverter bridge
Stream electricity.Such as the circuit topology form that Fig. 1 is common converter, after power frequency three-phase electricity is by three-phase commutation bridge, output has fluctuation
DC voltage after the filtering of bulky capacitor C, become the galvanic current not fluctuated.The unidirectional current the most not fluctuated
The input of input three phase inverter bridge, by the device for power switching controlled in triggering Fig. 1 of microcontroller.Such as Fig. 1, by six
The uncontrollable rectification circuit of three-phase that diode is constituted.On rectification circuit, three diode common cathodes of brachium pontis connect, lower brachium pontis
Three diode common-anode connect.An outfan bulky capacitor C in parallel at rectifier bridge, defeated through the unidirectional current of electric capacity C filtering
Entering the input of three phase inverter bridge, three phase inverter bridge is made up of the device for power switching of six fly-wheel diodes in parallel.Control three
The on off state of the power switch pipe of phase inverter bridge makes the alternating current of the AC output PWM waveform of inverter bridge.From above-mentioned analysis
Understanding the input bulky capacitor generally in parallel at the three phase inverter bridge of common converter, three-phase commutation bridge is exported by bulky capacitor
Unidirectional current have good filter action, can eliminate rectifier bridge export galvanic ripple stable DC input voltage.Directly
Stream bus shunt capacitance is easy to the afterflow of inductive load inductance, the reactive power of absorbing load end feedback, therefore DC bus capacitor
Also function to buffer the effect of quadergy.Bulky capacitor often requires that higher pressure voltage so having the production technology of material more
The price higher volumes of high requirement therefore bulky capacitor is the biggest.Therefore the volume of common converter is made due to the existence of bulky capacitor
Bigger cost is higher.Other devices in converter relative to the more difficult damage of electrochemical capacitor, the therefore life-span master of converter
Will be determined by electrochemical capacitor, big electric capacity is easier to damage thus have impact on the life-span of converter.
Common converter is in order to ensure that its stability and high-performance at DC side parallel bulky capacitor, but meanwhile need to increase
Converter volume and cost.
[summary of the invention]
For solving the problem that prior art exists, the invention provides the AC and DC hybrid transmission system of a kind of belt switch afterflow electric capacity
And control method, this AC and DC hybrid transmission system is the input side small capacitances in parallel at the three phase inverter bridge of converter, and with
One device for power switching having parallel diode of capacitances in series.This topological structure can not only realize the high property of common converter
Can and reduce the volume of converter and reduce cost and add the life-span of converter.
For achieving the above object, the present invention uses techniques below content:
The AC and DC hybrid transmission system of a kind of belt switch afterflow electric capacity, including three-phase commutation bridge, electric capacity C1, three phase inverter bridge and micro-
Controller；The leading-out terminal of described three-phase commutation bridge is connected by dc bus with the end of incoming cables of three phase inverter bridge, described electric capacity
C1 is connected in parallel on dc bus, and capacitive branch is provided with the power switch with anti-paralleled diode V7 connected with electric capacity C1
Device D7；The end of incoming cables of three-phase commutation bridge, the leading-out terminal of three phase inverter bridge are connected formation major loop respectively with electrical network and load；Institute
The microcontroller stated is all connected with the device for power switching of device for power switching D7 and three phase inverter bridge.
Three phase inverter bridge is made up of six brachium pontis, wherein switching devices the device for power switching of six fly-wheel diodes in parallel
V1 and switching device V4 constitute upper and lower bridge arm, and switching device V3, switching device V6 constitute upper and lower bridge arm, the 5th switching device V5,
Second switch device V2 constitutes upper and lower bridge arm.
Dc bus side is provided with voltage sensor, and the information of voltage of voltage sensor senses dc bus also feeds back to micro-
In controller.
The capacitance of described electric capacity C1 is 100～1000uF.
The control method of the AC and DC hybrid transmission system of a kind of belt switch afterflow electric capacity, comprises the following steps:
In major loop structure, three-phase alternating current first passes through three-phase commutation bridge, the DC supply input three phase inverter bridge of rectification output
DC side, the switch time of the device for power switching of microprocessor controls three phase inverter bridge and order make converter be in difference
Working method powering load, it is electric that the shutoff of power switch pipe D7 by controlling connect with electric capacity C1 simultaneously controls parallel connection
Hold whether C1 accesses in circuit；The control strategy of microcontroller includes control mode based on Sine Wave Pulse Width Modulation and directly turns
Square control mode.
When being in the control mode of Sine Wave Pulse Width Modulation, the upper and lower bridge arm alternate conduction of three phase inverter bridge, at brachium pontis
During switching, the inductance in load has freewheel current generation, and freewheel current flows to dc bus and causes dc bus to produce pump liter electricity
Pressure；When pumping voltage reaches threshold voltage, microprocessor controls device for power switching V7 conducting makes electric capacity C1 access in circuit,
Now the freewheel current of inductance flows to electric capacity C1；After afterflow completes, when electric capacity C1 both end voltage is more than the voltage of dc bus
Time, the energy stored in electric capacity C1 can be fed back in load by diode VD7.
The control mode of Sine Wave Pulse Width Modulation refer to using frequency identical with desired output voltage ripple sinusoidal wave as
Modulating wave, using the frequency ratio high isosceles triangle of expectation as carrier wave, when modulating wave intersects with carrier wave, true by their intersection point
Determine the break-make moment of inverter power switching device, control inverter bridge power switch open make inversion output obtain amplitude equal,
Width is by the pulse train of sinusoidal rule change.
When being in Direct Torque Control mode, the DC output side of three-phase commutation bridge accesses the input side of inverter bridge, time
Carving stator magnetic linkage and the electromagnetic torque of detection alternating current generator, and the result of detection compared with expected value, microcontroller leads to
Crossing result of the comparison choose corresponding space vector of voltage and then open the device for power switching that three phase inverter bridge is corresponding, it is fixed to reduce
Sub-magnetic linkage and electromagnetic torque and the gap of expected value；When Direct torque is shaped with the load of inductance, inductance produces freewheel current
Be back to the inside of load by the switching device of inverter bridge, the energy of final inductance savings is by internal internal resistance consumption.
The control mode of Direct Torque is according to stator magnetic linkage amplitude deviation delta ΨSSize and electromagnetic torque deviation delta Te
Size, then according to current stator magnetic linkage vector ΨSThe position at place, chooses suitable space vector of voltage, reduces stator magnet
Chain amplitude and the deviation of electromagnetic torque, it is achieved electromagnetic torque and the control of stator magnetic linkage.
Direct Torque Control uses two point form or bikini hystersis controller to be controlled magnetic linkage and torque.
Relative to prior art, the present invention has following technical effect that
The bulky capacitor that the dc bus of common converter is in parallel is changed into little electric capacity and connects one with small capacitances by the present invention
The individual device for power switching having anti-paralleled diode.This topological form not only reduce converter volume and also can also be real
The high-performance of existing converter, reduces the volume of converter and is easy to the transport of carrying of converter and also reduces cost, meanwhile
Small capacitances is not easy to damage thus adds the life-span of converter.In sum, belt switch afterflow capacitor topology form of the present invention
AC and DC hybrid transmission system not only there is the advantage of volume little cost relatively low life-span length, and can lead to when load is asynchronous machine
Cross the high-performance selecting different control strategies to realize out system.
The voltage of the converter three-phase commutation bridge output under this topology is not filtered voltage stabilizing through shunt capacitance, i.e. exists
Not opening with the power switch pipe of capacitances in series during rectification output makes electric capacity access circuit.Shunt capacitance under this topological form
Can play the effect of Inductor afterflow, i.e. when having inductance and have afterflow to the DC side of inverter bridge in load, power is opened
Guan Guanhui opens and makes electric capacity access circuit formation continuous current circuit.
Further, a voltage sensor is installed in dc bus side and a threshold voltage is set, during voltage sensor
Carve the voltage of detection dc bus, and the information of detection voltage swing is fed back in microcontroller.In loading, inductance is to directly
Can produce pumping voltage during stream side afterflow, when pumping voltage reaches threshold voltage, microcontroller sends signal triggering and electric capacity string
The power switch pipe of connection makes electric capacity access circuit.
Powering load after power frequency electric passes sequentially through three-phase commutation bridge and three phase inverter bridge in the control circuit of the present invention, supplies
The unidirectional current that rectification is not exported by electric process electric capacity has filter action, and by selecting control based on Sine Wave Pulse Width Modulation
Mode and Direct Torque Control mode realize the high-performance of converter.When load has inductance and has afterflow to dc bus end
During electric current, the rising of DC bus-bar voltage can be caused i.e. to cause pumping voltage, when pumping voltage reaches the threshold voltage arranged
Microcontroller can send the conducting of trigger pulse triggers power switch pipe makes electric capacity access the continuous current circuit of circuit formation inductance.
Sine Wave Pulse Width Modulation is to make inversion output obtain width by the on off state of control inverter bridge device for power switching
Being worth pulse train equal, that width presses sinusoidal rule change, this method is exactly Sine Wave Pulse Width Modulation.Topological form of the present invention
Under, the unidirectional current of rectification circuit output is not through the filtering voltage regulation of electric capacity, so the unidirectional current of output is fluctuation.At this
The method using sinusoidal pulse width modulation under bright topological structure controls the on off state output amplitude of inverter circuit device for power switching
Alternating current by sinusoidal rule change.When load is for three phase alternating current motor, under present configuration, utilize sinusoidal pulse width modulation
Method controls the alternating current of the State-output of inverter bridge device for power switching and the method for common converter sinusoidal pulse width modulation
The alternating current action effect controlling output is identical.Requirement according to the connect load of converter utilizes microprocessor controls inversion
Turning on and off of the switching device of each brachium pontis of bridge, makes the output of converter meet requirement.
Direct Torque Control is according to the inclined extent of stator magnetic linkage amplitude and the inclined extent of electromagnetic torque, then according to working as
The position at front stator flux linkage vector place, directly chooses suitable space vector of voltage, reduces stator magnetic linkage amplitude and electromagnetism turns
The deviation of square, it is achieved electromagnetic torque and the control of stator magnetic linkage.Under present configuration due to DC side output voltage be fluctuation,
So the space voltage vector amplitude obtained is fluctuation.But the time of each basic voltage vectors effect can calculate
Make final action effect identical with common converter, all reach reduction stator magnetic linkage and electromagnetic torque and expected value gap
Effect.Realize the high-performance of converter.
[accompanying drawing explanation]
Fig. 1 is the circuit topological structure of common converter.
Fig. 2 is the AC and DC hybrid transmission system major loop structure topological diagram of the present invention a kind of belt switch afterflow electric capacity.
Fig. 3 is the voltage waveform that in accompanying drawing 2, power frequency three-phase electricity exports through rectifier bridge.Direct current in uncontrollable rectification circuit
One maximum in the ac line voltage of side output so having obtained the voltage waveform of accompanying drawing 3.
Fig. 4 is to have the unidirectional current u of fluctuationdtThe PWM waveform of the lower output of effect.
Fig. 5 is stable DC electricity udThe PWM waveform of the lower output of effect.
Fig. 6 is phase voltage three dimensional vector diagram.
Fig. 7 is basic space vector of voltage figure.
Fig. 8 is the theory diagram of two point form magnetic linkage hystersis controller.As Δ Ψ >=εΨTime, FΨ=1；As Δ Ψ≤-εΨTime,
FΨ=-1；As-εΨ<ΔΨ<εΨTime, FΨ=0.
Fig. 9 is the theory diagram of bikini torque bang-bang controller.As Δ Te≥εTTime, FT=1；As Δ Te≤-εTTime,
FT=-1；As-εT<ΔTe<0,0<ΔTe<εTTime, FTConstant；As Δ TeWhen=0, FT=0.
Figure 10 is that under common converter, inverter bridge produces basic voltage vectorsVoltage magnitude figure.
Figure 11 be band afterflow electric capacity converter in inverter bridge produce basic voltage vectorsVoltage magnitude waveform.
[detailed description of the invention]
The invention will be further described with reference to the accompanying drawings.
In Fig. 2, the AC and DC hybrid transmission system of the present invention a kind of belt switch afterflow electric capacity, bulky capacitor is changed to little electric capacity also
Device for power switching with one inverse parallel fly-wheel diode of capacitances in series.It is uncontrollable whole that power frequency three-phase electricity first passes through three-phase bridge
Current circuit is converted to unidirectional current output.Be connected with the output of rectifier bridge is three phase inverter bridge, and three phase inverter bridge is by six parallel connections
The device for power switching of fly-wheel diode constitutes six brachium pontis, and wherein switching device V1 and switching device V4 constitutes upper and lower bridge arm,
Switching device V3, switching device V6 constitute upper and lower bridge arm, and the 5th switching device V5, second switch device V2 constitute upper and lower bridge arm.
Rectification output is connected in parallel with a capacitor C1 with the input of inverter bridge, the power having inverse parallel fly-wheel diode VD7 of connecting with C1
Switching device V7.
The load of inductance is had, if the power tube that three phase inverter bridge is opened is V1, V6, V2 and three bridges when converter accesses
Arm, when V1, V6, V2 simultaneously turn off, inductance can produce freewheel current to DC side.Freewheel current flows to: load inductance →
VD3, VD5 → V7 → C1 → VD4 → load inductance.Inductance time of afterflow is the shortest, and the afterflow process in the short time can produce
Spike and dc bus parallel connection small capacitances can play the effect of afterflow absorbing peak pulse.
Common converter is when input power is 1KW, and the size of the electrochemical capacitor being connected in parallel on dc bus is about 1000uF,
And the present invention capacitance in parallel can only need 1/10th of common converter shunt capacitance under identical input power completely
Electric capacity i.e. capacitance be the electric capacity of 100uF.Therefore the present invention is easy to carrying of converter at the volume reducing converter
Transport also reduces cost, and meanwhile small capacitances is not easy to damage thus adds the life-span of converter.
In main circuit structure, three-phase alternating current first passes through three-phase bridge rectification bridge.DC supply input three contrary of rectification output
Become the DC side of bridge, select the control strategy of inverter bridge to utilize microcontroller to control the switch of inverter bridge device for power switching
Time and order make converter be in different working methods.
If having inductance in Fu Zai, when in the control mode being in SPWM, inverter bridge under this kind of control mode
Upper and lower bridge arm alternate conduction.The most in office in a flash, three brachium pontis will be had to simultaneously turn on.It is probably above below a brachium pontis two
Individual brachium pontis, it is also possible to below both the above brachium pontis, a brachium pontis simultaneously turns on.When brachium pontis switches, the inductance in load has
Freewheel current produces.As transferred to shutoff as switching device V1, V2, V3 by opening state, switching device V4, V5, V6 by turn off turn
During for opening, have freewheel current flow to dc bus cause dc bus produce pumping voltage.When pumping voltage reaches threshold value
During voltage, device for power switching V7 conducting makes electric capacity C1 access in circuit, and now the freewheel current of inductance flows to electric capacity C1.Continuous
Flowing through journey free wheeling path is: load inductance → VD5 → V7 → C1 → VD4, VD6 → load inductance.After afterflow completes, work as electric capacity
When both end voltage is more than the voltage of dc bus, the energy stored in electric capacity can be fed back in load by diode VD7.
When being in Direct Torque Control mode, the DC output side of three-phase commutation bridge directly enters the input side of inverter bridge.
The stator magnetic linkage of moment detection alternating current generator and electromagnetic torque, and the result of detection is compared with expected value.By comparing
Result choose corresponding space vector of voltage and then open the device for power switching that three phase inverter bridge is corresponding, reduce stator magnetic linkage
Gap with electromagnetic torque Yu expected value.Such as FΨ=1, FT=-1, and magnetic linkage is when the first sector, tables look-up and knows that the voltage of correspondence is empty
Between vector beThe power switch pipe that corresponding diagram 2 is opened is V1, V5, V6.If FΨ、FTValue keep constant, when magnetic linkage rotates to
During the second sector, corresponding space vector of voltage isThe device for power switching that corresponding diagram 2 is opened is V1, V2, V6.At derailing switch
In the handoff procedure of part, load inductance has freewheel current to produce, and free wheeling path is: load inductance → V6 → VD2, VD4 → load electricity
Sense.Understand when Direct torque is shaped with the load of inductance, inductance produce freewheel current will not feed back to dc bus but by
Be back to the inside of load by the switching device of inverter bridge, the energy of final inductance savings is by internal internal resistance consumption.Therefore exist
Under the control mode of Direct Torque, the afterflow electric capacity of the DC side parallel of inverter bridge does not access circuit and forms continuous current circuit.
The present invention powers with three-phase alternating-current supply (A, B, C in Fig. 2), has inductance and to direct current in the connect load of converter
When side afterflow produces pumping voltage, shunt capacitance just can access circuit, and therefore unidirectional current is not had voltage regulation filtering to make by shunt capacitance
With, the unidirectional current of rectification output is to fluctuate as shown in Figure 3.Requirement according to the connect load of converter utilizes microprocessor controls
Turning on and off of the switching device of each brachium pontis of inverter bridge, makes the output of converter meet requirement.Electricity is had when converter accesses
The load such as threephase asynchronous machine of sense, when the inductance in load has freewheel current to flow to dc bus, now needs by micro-
What controller controlled three-phase inversion bridge DC side switching device V7 opens that to make electric capacity C1 access in circuit now three phase inverter bridge straight
The electric capacity of stream side plays afterflow and absorbs the effect of feedback reactive power.
The present invention accesses voltage sensor at the DC side of three phase inverter bridge and arranges a threshold voltage, if when in load
There is inductance and when DC side afterflow, owing to the circuit characteristic of rectified three-phase circuit makes the freewheel current of inductance will not feed back to electricity
Net goes thus the voltage U of DC side can be madeEFRaise, at UEFValue reach microcontroller during default threshold value can be to full control
Device V7 sends the conducting triggering signal triggering V7.The conducting of V7 makes electric capacity C1 be linked in circuit, now inverter bridge AC
The freewheel current of inductance can flow to electric capacity C1 reactive power is delivered in electric capacity.When load in inductance no longer afterflow time,
Owing to the voltage of dc bus is fluctuation, when capacitance voltage is more than DC bus-bar voltage, electric capacity C1 can pass through diode VD7
To AC feedback energy.
When load is for threephase asynchronous machine, the converter of this topological structure is used to have two kinds of control strategies, respectively:
(1) control mode based on Sine Wave Pulse Width Modulation (SPWM)
Using the frequency sine wave identical with desired output voltage ripple as modulating wave, with frequency ratio expectation much higher etc.
Lumbar triangle shape is as carrier wave, when modulating wave intersects with carrier wave, their intersection point determines the logical of inverter power switching device
In the disconnected moment, this method determining that inverter bridge power device switchs is referred to as " natural sampling method ", controls inversion with natural sampling method
Bridge power switch is opened and is made inversion output obtain the pulse train that amplitude is equal, width pacifies sinusoidal rule change, and this method is just
It it is Sine Wave Pulse Width Modulation.
Under the topological form of the converter of the present invention, the output of three-phase commutation bridge is the DC voltage such as Fig. 3 with fluctuation
Shown in.Under having the input of rippled DC electricity, three phase inverter bridge output amplitude is by PWM waveform such as Fig. 4 institute of sinusoidal rule change
Showing, the amplitude of the waveform exporting PWM DC bus-bar voltage is low when is low, exports PWM DC bus-bar voltage height when
The amplitude of waveform is high.Under identical power frequency three-phase electricity inputs, the PWM waveform of band afterflow electric capacity converter output is as shown in Figure 5.?
Fig. 4 and Fig. 5 finds out a pwm pulse cycle of random time point, the time integral of voltage in a pulse period of Fig. 5Owing to actual converter output PWM waveform frequency is the highest, it is believed that PWM waveform in Fig. 4
In the amplitude of each pulse period positive negative pulse stuffing be identical, the time integral of voltage in the pulse period as shown in Figure 4Make S1=S2, and then draw
Said method is utilized to determine each pulse period t in Fig. 4 in practical operationon1、toff1, then utilize microcontroller to change and adjust
Ripple processed makes the t of PWM waveform each pulse period of output under topological form of the present inventionon1、toff1Meet requirement.
When motor speed is not the lowest, stator resultant voltage is approximately with the relation of synthesis flux linkage space vector
The flux linkage vector that a pulse period voltage effect produces in the diagramMagnetic linkage is vowed in Figure 5
AmountBy S1=S2It is easy to getThen can be made under topological form of the present invention by the control of microcontroller
Frequency conversion output PWM waveform each pulse period voltage produces the effect that the effect of magnetic linkage produces with common converter output PWM waveform
The most identical, and then to make the general effect acting on motor under two kinds of topological form be the same.
(2) Direct Torque Control mode
The basic thought of the control mode of Direct Torque is according to stator magnetic linkage amplitude deviation delta ΨSSize and electromagnetism turn
Square deviation delta TeSize, then according to current stator magnetic linkage vector ΨSThe position at place, directly chooses suitable voltage space and vows
Amount, reduces stator magnetic linkage amplitude and the deviation of electromagnetic torque, it is achieved electromagnetic torque and the control of stator magnetic linkage.Direct Torque Control
Use two point form or bikini hystersis controller that magnetic linkage and torque are controlled.
Consider the locus of AC Electrical Machine Winding, the space vector of three stator phase voltage can be defined as shown in Figure 6.
Under common converter topological structure, eight kinds of on off states of converter bridge switching parts device can get eight kinds of basic spaces and vow
AmountAs it is shown in fig. 7, the most effectively work, vector isAnd voltage vectorFor zero vector.
Electromagnetic torque and the magnetic linkage of stator of moment detection motor detected value is carried out with expected value when motor runs
Relatively.It is illustrated in figure 8 two point form magnetic linkage hystersis controller, εΨBandwidth for controller.As Δ Ψ >=εΨTime, FΨ=1, select
Corresponding voltage vector makes ΨSIncrease；As Δ Ψ≤-εΨTime, FΨ=-1, selects corresponding voltage vector to make ΨSReduce；As-εΨ
<ΔΨ<εΨTime, FΨ=0, the voltage vector keeping original is constant.Fig. 9 is bikini torque hysteresis-controller, εTFor controller
Bandwidth.As Δ Te≥εTTime, FT=1, select corresponding voltage vector to make TeIncrease；As Δ Te≤-εTTime, FT=-1, selects
Corresponding voltage vector makes TeReduce；As-εT<ΔTe<0,0<ΔTe<εTTime, FTConstant, the voltage vector keeping original is constant；
As Δ TeWhen=0, FT=0, select corresponding voltage vector to make torque TeKeep constant.According to FΨ、FTValue look-up table choose
Space vector of voltage, zero vector is chosen according to the principle that switching loss is minimum.
When stator magnetic linkage is positioned at the first sector, if now FΨ=1, FT=1, then understand, according to tabling look-up, the sky chosen
Between voltage vector beThe device for power switching that now corresponding three phase inverter bridge is opened is V1, V2, V3.When magnetic linkage rotates to
During two sectors, if FΨ=1, FT=1, to table look-up and can obtain, corresponding space vector of voltage isNow corresponding three phase inverter bridge is opened
Logical device for power switching is V2, V3, V4.The space voltage vector chosen fromIt is transformed intoTime, inverter bridge power switch device
The state of part conducting also there occurs change.As Fig. 2 has above-mentioned when power tube V1 turns off V4 conducting, in motor, inductance has afterflow
Electric current produces, and the circulation path of freewheel current is: load → V2 → VD4, VD6 → load.Path by above-mentioned freewheel current can
Knowing when utilizing Direct Torque Control threephase asynchronous machine, the afterflow of the inductance of the inside of motor will not feed back to dc bus side and produce
Raw pumping voltage, the energy stored in inductance is finally consumed by motor internal resistance.It is connected in parallel on DC side under this control strategy
Electric capacity will not access circuit and play afterflow effect.
Converter under present configuration is fluctuation due to DC bus-bar voltage, so being switched shape by inverter eight kinds
The amplitude size of eight kinds of fundamental space voltage vectors that state obtains is fluctuation.With space vector of voltageAs a example by, band afterflow electricity
Hold what the output of inversion bridge obtainedAnd the output of belt switch afterflow electric capacity inversion bridge K is integer.Wherein udt's
The voltage waveform of waveform and Fig. 3 is identical.
Amplitude waveform as shown in Figure 10, if when Direct Torque Control select space voltage vectorEffect time
Between be T1, under producing identical action effect, select voltage vectorAction time is T2As shown in figure 11.In Fig. 10Make
By the magnetic linkage size of lower generationIn fig. 11The lower magnetic linkage size produced of effectT can be obtained2, utilize said method to utilize selected by microprocessor controls
Select at DC voltage udtThe space voltage vector action time of the lower inverter bridge output of input.So that it is determined that and voltage vectorMake
With effect same space voltage vectorThe time acted on.
By foregoing description, belt switch afterflow electric capacity converter still can use the strategy of Direct Torque Control, in real time
Monitoring stator flux of motor compares with electromagnetic torque and with expected value, selects suitable space electricity further according to result of the comparison
Pressure vector, makes stator magnetic linkage reduce with expected value gap with electromagnetic torque.Basic due to the formation under topological form of the present invention
The amplitude of space voltage vector be variation, but the time of each basic voltage vectors effect can calculate make final
Action effect is identical with common converter, has all reached the effect reducing stator magnetic linkage and electromagnetic torque with expected value gap.
In sum, the converter of belt switch afterflow capacitance structure can also use Direct Torque Control.
From the foregoing, it will be observed that in control mode based on Sine Wave Pulse Width Modulation (SPWM), be u at DC voltagedtTime, pass through
The action time being relatively calculated each pulse period direct impulse and reverse impulse makes in each pulse period pulse voltage
Produce magnetic linkage effect with when DC voltage be udDuring effect, the action effect of corresponding each pulse period pulse voltage is identical.
In the mode using Direct Torque Control, moment detection electromagnetic torque and stator magnetic linkage and with and respectively with respective desired value
Compare.According to result of the comparison choose suitable space vector of voltage motor torque and stator magnetic linkage are adjusted and then
Improve the performance of system.
In sum, the AC and DC hybrid transmission system of belt switch afterflow capacitor topology form of the present invention not only has the little cost of volume
The advantage of relatively low life-span length, and system can be realized out by selecting different control strategies when load is asynchronous machine
High-performance.
Claims (10)
1. the AC and DC hybrid transmission system of a belt switch afterflow electric capacity, it is characterised in that: include three-phase commutation bridge, electric capacity C1, three-phase
Inverter bridge and microcontroller；The leading-out terminal of described three-phase commutation bridge is connected by dc bus with the end of incoming cables of three phase inverter bridge,
Described electric capacity C1 is connected in parallel on dc bus, capacitive branch is provided with connect with electric capacity C1 with anti-paralleled diode V7
Device for power switching D7；The end of incoming cables of three-phase commutation bridge, the leading-out terminal of three phase inverter bridge are connected shape with electrical network and load respectively
Become major loop；Described microcontroller is all connected with the device for power switching of device for power switching D7 and three phase inverter bridge.
The AC and DC hybrid transmission system of a kind of belt switch afterflow electric capacity the most according to claim 1, it is characterised in that: three-phase inversion
Bridge is made up of six brachium pontis, wherein switching device V1 and switching device V4 structure the device for power switching of six fly-wheel diodes in parallel
Becoming upper and lower bridge arm, switching device V3, switching device V6 constitute upper and lower bridge arm, the 5th switching device V5, second switch device V2 structure
Become upper and lower bridge arm.
The AC and DC hybrid transmission system of a kind of belt switch afterflow electric capacity the most according to claim 1, it is characterised in that: dc bus
Side is provided with voltage sensor, and the information of voltage of voltage sensor senses dc bus also feeds back in microcontroller.
The AC and DC hybrid transmission system of a kind of belt switch afterflow electric capacity the most according to claim 1, it is characterised in that: described electricity
The capacitance holding C1 is 100～1000uF.
5. a control method for AC and DC hybrid transmission system based on the belt switch afterflow electric capacity described in claim 1, its feature exists
In: comprise the following steps:
In major loop structure, three-phase alternating current first passes through three-phase commutation bridge, the DC supply input three phase inverter bridge of rectification output straight
Stream side, the switch time of the device for power switching of microprocessor controls three phase inverter bridge and order make converter be in different works
Making mode powering load, the shutoff of the power switch pipe D7 simultaneously connected with electric capacity C1 by control controls shunt capacitance C1
Whether access in circuit；The control strategy of microcontroller includes control mode based on Sine Wave Pulse Width Modulation and Direct torque
Mode processed.
The control method of the AC and DC hybrid transmission system of belt switch afterflow electric capacity the most according to claim 5, it is characterised in that:
When being in the control mode of Sine Wave Pulse Width Modulation, the upper and lower bridge arm alternate conduction of three phase inverter bridge, switch at brachium pontis
Time load in inductance have freewheel current produce, freewheel current flow to dc bus cause dc bus produce pumping voltage；
When pumping voltage reaches threshold voltage, microprocessor controls device for power switching V7 conducting makes electric capacity C1 access in circuit, this
Time inductance freewheel current flow to electric capacity C1；After afterflow completes, when electric capacity C1 both end voltage is more than the voltage of dc bus,
The energy stored in electric capacity C1 can be fed back in load by diode VD7.
The control method of the AC and DC hybrid transmission system of belt switch afterflow electric capacity the most according to claim 6, it is characterised in that:
The control mode of Sine Wave Pulse Width Modulation refers to using the frequency sine wave identical with desired output voltage ripple as modulation
Using frequency ratio, ripple, expects that high isosceles triangle, as carrier wave, when modulating wave intersects with carrier wave, is determined inverse by their intersection point
Become the break-make moment of device device for power switching, control inverter bridge power switch open make inversion output obtain amplitude is equal, width
Pulse train by sinusoidal rule change.
The control method of the AC and DC hybrid transmission system of belt switch afterflow electric capacity the most according to claim 6, it is characterised in that:
When being in Direct Torque Control mode, the DC output side of three-phase commutation bridge accesses the input side of inverter bridge, and the moment is examined
Survey the stator magnetic linkage of alternating current generator and electromagnetic torque, and the result of detection compared with expected value, microcontroller pass through than
Result relatively is chosen corresponding space vector of voltage and then opens the device for power switching that three phase inverter bridge is corresponding, reduces stator magnet
Chain and electromagnetic torque and the gap of expected value；When Direct torque is shaped with the load of inductance, inductance produces freewheel current to be passed through
The switching device of inverter bridge is back to the inside of load, and the energy of final inductance savings is by internal internal resistance consumption.
The control method of the AC and DC hybrid transmission system of belt switch afterflow electric capacity the most according to claim 8, it is characterised in that:
The control mode of Direct Torque is according to stator magnetic linkage amplitude deviation delta ΨSSize and electromagnetic torque deviation delta TeBig
Little, then according to current stator magnetic linkage vector ΨSThe position at place, chooses suitable space vector of voltage, reduces stator magnetic linkage width
Value and the deviation of electromagnetic torque, it is achieved electromagnetic torque and the control of stator magnetic linkage.
The control method of the AC and DC hybrid transmission system of belt switch afterflow electric capacity the most according to claim 9, it is characterised in that:
Direct Torque Control uses two point form or bikini hystersis controller to be controlled magnetic linkage and torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610505248.2A CN105958836B (en) | 2016-06-30 | 2016-06-30 | A kind of AC and DC hybrid transmission system and its control method of belt switch afterflow capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610505248.2A CN105958836B (en) | 2016-06-30 | 2016-06-30 | A kind of AC and DC hybrid transmission system and its control method of belt switch afterflow capacitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105958836A true CN105958836A (en) | 2016-09-21 |
| CN105958836B CN105958836B (en) | 2019-03-08 |
Family
ID=56902075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610505248.2A Expired - Fee Related CN105958836B (en) | 2016-06-30 | 2016-06-30 | A kind of AC and DC hybrid transmission system and its control method of belt switch afterflow capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105958836B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111022A (en) * | 2018-01-11 | 2018-06-01 | 东南大学 | New-energy automobile motor driving and vehicle-mounted power generation integrated system and its control method |
| CN109842283A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Angle mill and electric tool |
| CN110445407A (en) * | 2019-08-19 | 2019-11-12 | 电子科技大学 | It is a kind of for starting the rectification circuit of power generation all-in-one machine |
| CN110620459A (en) * | 2018-06-20 | 2019-12-27 | Bsh家用电器有限公司 | Driving circuit for operating BLDC motor |
| CN112015093A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN113054887A (en) * | 2019-12-28 | 2021-06-29 | 南京德朔实业有限公司 | Overvoltage protection circuit and method of electric tool and electric tool |
| CN113364305A (en) * | 2021-05-08 | 2021-09-07 | 黄石东贝压缩机有限公司 | Frequency converter for controlling rotating speed of variable frequency compressor and control method thereof |
| CN115021554A (en) * | 2022-08-05 | 2022-09-06 | 浙江大学 | Adapter circuit, filter system, AC-DC power supply and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530756A (en) * | 1991-07-19 | 1993-02-05 | Mitsubishi Electric Corp | Converter circuit |
| DE102004042256A1 (en) * | 2003-09-15 | 2005-04-07 | Heidelberger Druckmaschinen Ag | Direct voltage link circuit e.g. for printing machine, has DC link voltage dropped across series-circuit of ohmic resistor and DC link capacitor |
| CN1852021A (en) * | 2006-05-26 | 2006-10-25 | 南京航空航天大学 | L-source inventer |
| JP2010213510A (en) * | 2009-03-11 | 2010-09-24 | Ebara Corp | Power device for dry vacuum pump and method for operating the same |
| CN104578843A (en) * | 2014-12-22 | 2015-04-29 | 广州金升阳科技有限公司 | Filter circuit of AC/DC (alternating current/direct current) switching converter |
| CN105556817A (en) * | 2013-09-19 | 2016-05-04 | 大金工业株式会社 | Power conversion device |
-
2016
- 2016-06-30 CN CN201610505248.2A patent/CN105958836B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530756A (en) * | 1991-07-19 | 1993-02-05 | Mitsubishi Electric Corp | Converter circuit |
| DE102004042256A1 (en) * | 2003-09-15 | 2005-04-07 | Heidelberger Druckmaschinen Ag | Direct voltage link circuit e.g. for printing machine, has DC link voltage dropped across series-circuit of ohmic resistor and DC link capacitor |
| CN1852021A (en) * | 2006-05-26 | 2006-10-25 | 南京航空航天大学 | L-source inventer |
| JP2010213510A (en) * | 2009-03-11 | 2010-09-24 | Ebara Corp | Power device for dry vacuum pump and method for operating the same |
| CN105556817A (en) * | 2013-09-19 | 2016-05-04 | 大金工业株式会社 | Power conversion device |
| CN104578843A (en) * | 2014-12-22 | 2015-04-29 | 广州金升阳科技有限公司 | Filter circuit of AC/DC (alternating current/direct current) switching converter |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109842283A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Angle mill and electric tool |
| CN109842282A (en) * | 2017-11-24 | 2019-06-04 | 南京德朔实业有限公司 | Electric tool |
| CN109842282B (en) * | 2017-11-24 | 2020-10-16 | 南京德朔实业有限公司 | Electric tool |
| CN109842283B (en) * | 2017-11-24 | 2020-10-23 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN108111022A (en) * | 2018-01-11 | 2018-06-01 | 东南大学 | New-energy automobile motor driving and vehicle-mounted power generation integrated system and its control method |
| CN110620459B (en) * | 2018-06-20 | 2024-01-05 | Bsh家用电器有限公司 | Driving circuit for operating BLDC motor |
| CN110620459A (en) * | 2018-06-20 | 2019-12-27 | Bsh家用电器有限公司 | Driving circuit for operating BLDC motor |
| CN112015093A (en) * | 2019-05-31 | 2020-12-01 | 广东美的制冷设备有限公司 | Drive control method, device, household appliance and computer readable storage medium |
| CN110445407B (en) * | 2019-08-19 | 2021-02-12 | 电子科技大学 | Rectifying circuit for starting power generation all-in-one machine |
| CN110445407A (en) * | 2019-08-19 | 2019-11-12 | 电子科技大学 | It is a kind of for starting the rectification circuit of power generation all-in-one machine |
| CN113054887A (en) * | 2019-12-28 | 2021-06-29 | 南京德朔实业有限公司 | Overvoltage protection circuit and method of electric tool and electric tool |
| CN113054887B (en) * | 2019-12-28 | 2024-01-05 | 南京泉峰科技有限公司 | Overvoltage protection circuit and method of electric tool and electric tool |
| CN113364305A (en) * | 2021-05-08 | 2021-09-07 | 黄石东贝压缩机有限公司 | Frequency converter for controlling rotating speed of variable frequency compressor and control method thereof |
| CN115021554A (en) * | 2022-08-05 | 2022-09-06 | 浙江大学 | Adapter circuit, filter system, AC-DC power supply and method |
| CN115021554B (en) * | 2022-08-05 | 2022-11-08 | 浙江大学 | Adapter circuit, filtering system, AC-DC power supply and method |
| US11984797B2 (en) | 2022-08-05 | 2024-05-14 | Zhejiang University | Adapter circuit, filter system, AC-DC power source and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105958836B (en) | 2019-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105958836B (en) | A kind of AC and DC hybrid transmission system and its control method of belt switch afterflow capacitor | |
| CN101499771B (en) | Frequency-changing speed-regulating driver for energy feedback three phase motor with three phase electric power | |
| CN102255529B (en) | Comprehensive control method for high-power efficient energy consuming high-frequency switching power supply | |
| CN105122620B (en) | Power inverter | |
| CN101267179A (en) | High-speed brushless DC electromotor start/power generation system based on dual-level matrix frequency converter | |
| CN105119536B (en) | A kind of motor driver topology and its control method | |
| CN110920422B (en) | High-power electric vehicle charging device based on current source and control method | |
| CN106716807A (en) | Electric power conversion device | |
| CN108281979A (en) | A kind of electronics feedback load circuit of suitable low-voltage, high-current input | |
| CN113844296A (en) | Electric automobile integrated charger based on double three-phase motors and control method thereof | |
| CN202085085U (en) | Large power efficient energy-consuming high frequency switch power supply | |
| Amirabadi et al. | Partial resonant AC link converter: A highly reliable variable frequency drive | |
| CN101860318B (en) | Alternating current governing system for twin-stage matrix converter having anti-losing capability | |
| CN113119804A (en) | Energy conversion device, control method, vehicle, and readable storage medium | |
| CN106787857A (en) | Unidirectional mixing three-phase voltage type rectifier | |
| CN104796019B (en) | A kind of Z sources three-level PWM rectifier and its control method | |
| CN201839223U (en) | Zero-voltage transition inverter circuit of brushless DC motor | |
| Srinivasan et al. | Power Quality Analysis of Vienna Rectifier for BLDC Motor Drive Application | |
| CN208386446U (en) | A kind of doube bridge arm ac-dc-ac inverter soft activator | |
| CN101783601B (en) | Multiphase current type PWM rectifier based on dual controllable rectifier bridge of hybrid switch | |
| CN106787903A (en) | For the resonance electrode soft switch reversion circuit that brshless DC motor drives | |
| CN205864270U (en) | A kind of AC and DC hybrid transmission system of belt switch afterflow electric capacity | |
| CN114865983B (en) | Three-phase alternating current speed regulation system for multiplexing excitation winding | |
| CN103560679B (en) | PWM-type high power AC stable-pressure device | |
| CN102136823B (en) | Alternating-current load control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190308 |