CN107634674A - The neutral-point-potential balance control device and method of three level energy back feed devices - Google Patents
The neutral-point-potential balance control device and method of three level energy back feed devices Download PDFInfo
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Abstract
The present invention is the neutral-point-potential balance control device and method of three level energy back feed devices, and device includes control module, on-off circuit and midpoint potential detection module；Midpoint potential detection module is provided with two voltage detection modules, is respectively used to detect the upper bridge arm voltage of the level feedback device of NPC types three and lower bridge arm voltage；Control module is output to the conducting sequential of on-off circuit respective switch pipe according to the upper bridge arm voltage and lower bridge arm voltage detected, control, and the midpoint to the level feedback device of NPC types three carries out charge or discharge, realizes neutral-point-potential balance control.The present invention is placed on the level feedback devices of NPC tri-, according to upper and lower bridge arm voltage difference, using the control strategy for break-make of staggering the time, dynamically adjusts the voltage signal for being applied to switching tube, realizes feedback device neutral-point potential balance.
Description
Technical field
The present invention relates to neutral-point-potential balance control technology, and in particular to a kind of midpoint electricity of three level energy back feed device
Position balance control device and method.
Background technology
Subway is one of most important means of transport in urban track traffic system, relative to electric railway main line
Speech, subway has the characteristics that distance between sites are shorter, starts and brake frequently, speed of service change is fast.By again when subway brakes
The kinetic energy of vehicle, is converted into electric energy by raw braking, caused electric energy is fed back on the dc bus of its power supply, if do not had nearby
In the case of having other vehicles absorption electric energy, its DC bus-bar voltage can be improved rapidly.DC bus-bar voltage is too high, can be right
The safe operation of railcar threatens.For stable DC busbar voltage, existing processing method is with electricity in subway system
Based on resistance power consumption, this method not only causes the huge waste of the energy, but also environment temperature in tunnel can be made to increase, and can increase
Add the burden of ventilation cooling system in tunnel, cause further electric energy loss.
In recent years, in order to absorb energy caused by subway regenerative braking, energy back feed device has been applied to ground by people
In iron.Subway energy back feed device general principle is, by the electric energy on dc bus by way of inversion feedback, direct feedback
To AC network.So caused energy can just be reused in subway brake process, so as to improve subway energy profit
Use efficiency.
Because output voltage than two-level inverter has smaller dv/dt and total harmonic distortion factor, diode clamp type
(NPC, Neutral Point Clamped)) three-level inverter is widely used in subway energy back feed device.
However, there is the defects of mid-point potential offset in this inverter；For the defect, modulation strategy of the scholars from this inverter
Aspect proposes many control methods, by realizing NPC three-level inverter midpoint potentials in inverter embedded software algorithm
Balance control.However, found in the engineer applied of reality, when inverter exports larger watt current to power network, these
Software algorithm has preferable counterbalance effect；When inverter is operated in idle voltage stabilizing state, these software algorithm counterbalance effects
It is not good enough, the phenomenon that midpoint potential is seriously offset even occurs under some operating modes.If mid-point potential offset is excessive, can cause
Upper and lower bridge arm voltage's distribiuting is uneven, so as to cause the increase of inverter output voltage total harmonic distortion factor and the damage of switching device.
, need to be according to the feelings of subway regenerating braking energy when NPC three-level inverters are applied in subway energy back feed device
Condition, inverter constantly switch under active grid-connected and idle two kinds of mode of operations of voltage stabilizing.Therefore, this inverter how is made in nothing
Neutral-point potential balance under work(potentiostatic mode, turning into three level subway energy back feed devices has major issue to be solved.
The content of the invention
In order to solve the above mentioned problem present in prior art, the present invention proposes the midpoint electricity of three level energy back feed devices
Position balance control device and method, are placed on the level feedback devices of NPC tri-, according to upper and lower bridge arm voltage difference, using break-make of staggering the time
Control strategy, dynamically adjust the voltage signal for being applied to switching tube, realize feedback device neutral-point potential balance.
Control device of the present invention adopts the following technical scheme that：The neutral-point-potential balance control dress of three level energy back feed devices
Put, using the level feedback device of NPC types three, including control module, on-off circuit and midpoint potential detection module；Midpoint potential is examined
Module is surveyed to be connected with the level feedback device of NPC types three, including two voltage detection modules and a signal conditioning circuit, two electricity
Pressure detection module is respectively used to detect the upper bridge arm voltage of the level feedback device of NPC types three and lower bridge arm voltage, and that is detected is upper
Bridge arm voltage, lower bridge arm voltage are exported to control module after signal conditioning circuit is handled；Control module is upper according to what is detected
Bridge arm voltage and lower bridge arm voltage, control are output to the conducting sequential of on-off circuit respective switch pipe, give the level feedback of NPC types three
The midpoint of device carries out charge or discharge, realizes neutral-point-potential balance control.
Preferably, the control module is provided with four road pwm signal output channels；The on-off circuit includes inductance L and string
Join the IGBT switching tubes S of connection1-S4, IGBT switching tubes S1-S4Midpoint after series connection fills through inductance L and the level feedback of NPC types three
The midpoint connection put, IGBT switching tubes S1-S4Grid be connected respectively with four road pwm signal output channels.
Preferably, IGBT switching tubes S2Colelctor electrode and IGBT switching tubes S1Emitter stage connects, IGBT switching tubes S3Emitter stage with
IGBT switching tubes S4Colelctor electrode connects, IGBT switching tubes S2Emitter stage IGBT switching tubes S3The tie point C of colelctor electrode through inductance L with
The midpoint connection of the level feedback device of NPC types three；IGBT switching tubes S1-S4Inverse parallel is respectively equipped between colelctor electrode and emitter stage
Fly-wheel diode VD3、VD4、VD5、VD6。
Preferably, IGBT switching tubes S2Colelctor electrode and IGBT switching tubes S1The tie point A of emitter stage returns with the level of NPC types three
Clamp diode VD is provided between the midpoint O of feedback device1；IGBT switching tubes S3Emitter stage and IGBT switching tubes S4The company of colelctor electrode
Clamp diode VD is provided between the midpoint O of the level feedback device of contact B and NPC type three2。
Preferably, the control module includes AD conversion module and the pi regulator being connected, logical provided with the inputs of AD all the way
The road pwm signal output channels of Dao He tetra-, AD input channels are connected with signal conditioning circuit, four road pwm signal output channel difference
It is connected with the switching tube of on-off circuit.Control module is output to switch electricity by controlling the dutycycle of pwm signal, dynamically to adjust
The pwm signal of road respective switch pipe.
Neutral-point-potential balance control device of the control method of the present invention based on above-mentioned three level energy back feed device, including with
Lower step：
Step 1, midpoint potential detection module detect upper bridge arm voltage and lower bridge arm respectively by two voltage detection modules
Voltage；
Step 2, upper bridge arm voltage and lower bridge arm voltage are obtained into midpoint potential deviation as difference by signal conditioning circuit believed
Number, and midpoint potential deviation signal is transferred to the AD input channels of control module after conditioning；
Step 3, control module carry out judgement processing according to midpoint potential deviation signal：Under if midpoint potential deviation is more than
Limit threshold value U1, and it is less than upper limit threshold U2, then midpoint potential is judged in error range, without control；If midpoint potential
Deviation signal is less than lower threshold U1, then judge on midpoint potential that subsequently into upper inclined control strategy, control module passes through PI partially
Adjuster controlling switch pipe S3、S4The dutycycle of conducting, to realize balance control；If midpoint potential deviation signal is more than the upper limit
Threshold value U2, then judge under midpoint potential that subsequently into lower inclined control strategy, control module passes through pi regulator controlling switch pipe partially
S1、S2The dutycycle of conducting, to realize balance control.
The process of the upper control strategy partially includes：
Midpoint potential deviation signal after perunit is handled, is input in pi regulator by S41, control module, by PI
Switching tube S is obtained after adjuster3、S4The dutycycle D of conducting2；
S42, control module pass through the 3rd pwm signal output channel controlling switch pipe S3Conducting, after the Δ t times, control mould
Block passes through the 4th pwm signal output channel controlling switch pipe S4Conducting；
S43, switching tube S3、S4Conducting, the midpoint O of the level feedback device of NPC types three pass through switching tube S3、S4, inductance L and
The negative busbar N of the level feedback device of NPC types three forms loop, and midpoint O is discharged by inductance L to negative busbar N, opens midpoint potential
Beginning moves down；
S44, control module are according to dutycycle D2Calculate switching tube S4Duration is turned on, at the end of conducting, passes through the 4th PWM
Signal output channels controlling switch pipe S4Shut-off, passes through clamp diode VD2It is midpoint O current potentials to make tie point B current potentials clamper；It is logical
Cross switching tube S1、S2Antiparallel fly-wheel diode VD3、VD4Continuous current circuit is provided for inductance L, positive bus-bar P passes through the pole of afterflow two
Pipe VD3、VD4, inductance L give midpoint O electric discharge, make midpoint potential start to move down；After the Δ t times, control module is believed by the 3rd PWM
Number output channel controlling switch pipe S3Shut-off, tie point B current potentials clamper are midpoint O current potentials, fly-wheel diode VD3、VD4Conducting, even
Contact C current potentials clamper is positive bus-bar P point current potentials；
S45, switching tube S3、S4Shut-off, bears DC bus-bar voltage, realizes static state voltage equipoise jointly；
Repetitive cycling step S42-45, in the range of midpoint potential moves down into error permission.
The process of the lower control strategy partially includes：
Midpoint potential deviation signal after perunit is handled, is input in pi regulator by S51, control module, by PI
Switching tube S is obtained after adjuster1、S2The dutycycle D of conducting1；
S52, control module pass through the second pwm signal output channel controlling switch pipe S2Conducting, after the Δ t times, control mould
Block passes through the first pwm signal output channel controlling switch pipe S1Conducting；
S53, switching tube S1、S2Conducting, the positive bus-bar P of the level feedback device of NPC types three pass through switching tube S1、S2, inductance L
Loop is formed with the midpoint O of the level feedback device of NPC types three, positive bus-bar P is charged by inductance L to midpoint O, opens midpoint potential
Beginning moves up；
S54, control module are according to dutycycle D1Calculate switching tube S1Conducting duration, at the end of conducting, pass through first
Pwm signal output channel controlling switch pipe S1Shut-off, now on-off circuit passes through clamp diode VD1Make tie point A current potential clampers
For midpoint O current potentials；Pass through switching tube S3、S4Antiparallel fly-wheel diode VD5、VD6Continuous current circuit, negative busbar are provided for inductance L
N passes through VD5、VD6, inductance L give midpoint O charging, make midpoint potential start to move up；After the Δ t times, control module passes through the 2nd PWM
Signal output channels controlling switch pipe S2Shut-off, tie point A current potentials clamper are midpoint O current potentials, fly-wheel diode VD5、VD6Conducting,
Tie point C current potentials clamper is negative busbar N point current potentials；
S55, switching tube S1、S2Shut-off, bears DC bus-bar voltage, realizes static state voltage equipoise jointly；
Repetitive cycling step S52-S55, in the range of error is moved on on midpoint potential and is allowed.
As shown from the above technical solution, the present invention has following beneficial effect compared with prior art：
1st, midpoint potential deviation signal is sent to by control module by midpoint potential detection module, control module is according to partially
Difference signal, implement corresponding break-make control strategy of staggering the time, and send control signal to mainly by switching tube and voltage-regulator diode structure
Into auxiliary circuit module, realize feedback device neutral-point-potential balance control.
2nd, the voltage signal being applied on switching tube is not constant power supply, but control module is according to midpoint potential deviation
Signal comes caused by dynamic, and no matter midpoint potential is upper inclined or lower inclined, quickly and accurately alignment current potential can be discharged
Or the voltage's distribiuting of charging, rapidly balance upper and lower bridge arm.
3rd, the present invention produces " delay dislocation pulse " by control module, when carrying out the switching tube conducting in controlling switch circuit
Sequence, the voltage that can make to bear on switching tube halve.For direct current nominal voltage be the level feedback devices of 1500V tri- (such as
Iron feedback device), make switch tube voltage in auxiliary circuit module in below 1000V using " break-make of staggering the time " control strategy,
Avoid using price costly, the larger high withstand voltage switching tube of volume, reduce implementation cost.
Brief description of the drawings
Fig. 1 is the neutral-point-potential balance control apparatus structure schematic diagram of three level energy back feed devices of the invention；
Fig. 2 is the control module control structure flow chart according to one embodiment of the invention；
Fig. 3 is to bear voltage waveform according to stagger the time switching tube S1, S2 after break-make control of the use of one embodiment of the invention
Figure；
Fig. 4 is to be staggered the time control signal oscillogram after break-make control according to the use of one embodiment of the invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, technical scheme is described further, but the implementation of the present invention
Mode is not limited to this.
Embodiment
As shown in figure 1, by taking subway feedback device as an example, the present embodiment neutral-point-potential balance control device includes：Control mould
Block, auxiliary circuit module and midpoint potential detection module.Midpoint potential detection module connects with the level subway feedback device of NPC types three
Connect, including two voltage detection modules and a signal conditioning circuit, one of voltage detection module are used to detect NPC types three
Current potential between the positive bus-bar of level subway feedback device and midpoint, i.e., upper bridge arm voltage, another voltage detection module are used for
The current potential between the midpoint of the level subway feedback device of NPC types three and negative busbar is detected, that is, descends bridge arm voltage；The upper bridge detected
Arm voltage, lower bridge arm voltage are exported to control module after signal conditioning circuit is handled.Auxiliary circuit module and control module
Output end connects, and is on-off circuit, including S1-S4Four switching tubes, inductance L and diode VD1-VD2.Control module is according to inspection
The upper bridge arm voltage and lower bridge arm voltage measured, corresponding pwm signal is exported to switching tube, carries out neutral-point-potential balance control.
In the present embodiment, voltage detection module is realized using direct current voltage sensor；Control module includes the AD conversion being connected
Module and pi regulator, provided with AD input channels all the way and four road pwm signal output channels, AD input channels and signal condition electricity
Road connect, four road pwm signal output channels respectively with S1-S4Four switching tube connections.
In the present invention, midpoint potential detection module is inclined as midpoint potential using the difference of upper bridge arm voltage and lower bridge arm voltage
Difference signal is transferred to control module.Control module carries out neutral-point-potential balance control according to midpoint potential deviation signal.Work as deviation
Less than a certain threshold voltage U1When, then control module is judged on midpoint potential partially；When deviation is more than a certain threshold voltage U2When, then
Judge under midpoint potential partially；Control module puts into corresponding control strategy according to the drift condition of midpoint potential, using " staggering the time
Break-make " control strategy, " pulse of staggering the time " is sent to the switching tube in control auxiliary circuit module (i.e. on-off circuit).And switch electricity
The control signal that road is sent according to control module, the switching tube turn-on and turn-off come in control module, realizes neutral-point potential balance
Control.The present invention produces " delay dislocation pulse " by control module, the switching tube conducting sequential come in controlling switch circuit, can
So that the voltage born on switching tube halves.
As shown in Fig. 2 control process comprises the following steps：
Step 1, midpoint potential detection module detect the level subway of NPC types three by two direct current voltage sensors and returned respectively
Present the upper bridge arm voltage of device and lower bridge arm voltage；
Step 2, the upper bridge arm voltage detected in step 1 and lower bridge arm voltage passed through in midpoint potential detection module
It is poor that signal conditioning circuit is made, and obtains midpoint potential deviation signal, and midpoint potential deviation signal is transferred into control after conditioning
The AD input channels of controller in molding block；
The midpoint potential deviation signal that step 3, controller are read according to its AD input channel carries out judgement processing：In if
Point potential error is more than lower threshold U1, and it is less than upper limit threshold U2, then midpoint potential is judged in error range, without
Control, terminate；If midpoint potential deviation signal is less than lower threshold U1, then judge on midpoint potential partially, to then go to step 4
Into upper inclined control strategy, controller passes through pi regulator controlling switch pipe S3、S4The dutycycle of conducting, to realize balance control；
If midpoint potential deviation signal is more than upper limit threshold U2, then judge under midpoint potential partially, to then go to step 5 and enter lower control partially
System strategy, controller pass through pi regulator controlling switch pipe S1、S2The dutycycle of conducting, to realize balance control；
The specific implementation process of step 4, upper control strategy partially：
Midpoint potential deviation signal after perunit is handled, is input in pi regulator by S41, controller, is adjusted by P I
S is obtained after section device3、S4The dutycycle D of conducting2；
S42, input " break-make of staggering the time control ", controller control auxiliary circuit module by the 3rd pwm signal output channel
In switching tube S3Conducting, after the Δ t times, controller is controlled in auxiliary circuit module by the 4th pwm signal output channel
Switching tube S4Conducting；
Switching tube S in S43, auxiliary circuit module3、S4Conducting, the midpoint O of device pass through switching tube S3、S4, inductance L and
The negative busbar N of device forms loop, i.e. midpoint O is discharged by inductance L to negative busbar N, makes midpoint potential start to move down；
S44, input " break-make of staggering the time control ", controller is according to dutycycle D2Calculate the switching tube in auxiliary circuit module
S4Duration is turned on, at the end of conducting, passes through the 4th pwm signal output channel controlling switch pipe S4Turn off, now auxiliary circuit module
In, pass through diode VD2It is midpoint O current potentials, therefore, switching tube S to make B point current potentials clamper in circuit4The voltage born after shut-off is
Bridge arm voltage under device.At the same time, switching tube S is passed through1、S2Antiparallel fly-wheel diode VD3、VD4There is provided for inductance L continuous
Road is flowed back to, i.e. positive bus-bar P passes through VD3、VD4, inductance L give midpoint O electric discharge, make midpoint potential start to move down.After the Δ t times, control
Device passes through the 3rd pwm signal output channel controlling switch pipe S3Shut-off, B point current potentials clamper is midpoint O current potentials in circuit, VD3、VD4
Conducting, C point current potentials clamper are positive bus-bar P point current potentials, therefore switching tube S3The voltage born during shut-off is bridge arm voltage on device；
Switching tube S in S45, auxiliary circuit module3、S4Shut-off, bears DC bus-bar voltage, realizes static state voltage equipoise jointly.
S46, repeat step S42, controller control the switch in auxiliary circuit module by the 3rd pwm signal output channel
Pipe S3Conducting, now in auxiliary circuit module, passes through diode VD2It is midpoint O current potentials to make B point current potentials clamper in circuit, therefore,
Now switching tube S4The voltage born is bridge arm voltage under device.After the Δ t times, controller is exported logical by the 4th pwm signal
Switching tube S in road control control auxiliary circuit module4Conducting.So successively circulation step S42-45, until under midpoint potential
Move on in the range of error permission.
The specific implementation process of step 5, lower control strategy partially：
Midpoint potential deviation signal after perunit is handled, is input in pi regulator by S51, controller, is adjusted by P I
Switching tube S is obtained after section device1、S2The dutycycle D of conducting1；
S52, input " break-make of staggering the time control ", controller control auxiliary circuit module by the second pwm signal output channel
In switching tube S2Conducting, after the Δ t times, controller is controlled in auxiliary circuit module by the first pwm signal output channel
Switching tube S1Conducting；
Switching tube S in S53, auxiliary circuit module1、S2Conducting, the positive bus-bar P of device pass through switching tube S1、S2, inductance L
Loop is formed with the midpoint O of device, i.e. positive bus-bar P is charged by inductance L to midpoint O, makes midpoint potential start to move up；
S54, input " break-make of staggering the time control ", controller is according to dutycycle D1Calculate the switching tube in auxiliary circuit module
S1Conducting duration, at the end of conducting, pass through the first pwm signal output channel controlling switch pipe S1Turn off, now auxiliary circuit mould
Pass through diode VD in block1It is midpoint O current potentials, therefore, switching tube S to make A point current potentials clamper in circuit1The voltage born after shut-off
For bridge arm voltage on device.At the same time, switching tube S is passed through3、S4Antiparallel fly-wheel diode VD5、VD6There is provided for inductance L
Continuous current circuit, i.e. negative busbar N pass through VD5、VD6, inductance L give midpoint O charging, make midpoint potential start to move up.After the Δ t times, control
Device processed passes through the second pwm signal output channel controlling switch pipe S2Shut-off, A point current potentials clamper is midpoint O current potentials in circuit, VD5、
VD6Conducting, C point current potentials clamper are negative busbar N point current potentials, therefore switching tube S2The voltage born during shut-off is bridge arm electricity under device
Pressure；
Switching tube S in S55, auxiliary circuit module1、S2Shut-off, bears DC bus-bar voltage, realizes static state voltage equipoise jointly.
S56, S52 is repeated, controller controls the switching tube S in auxiliary circuit module by the second pwm signal output channel2
Conducting, now in auxiliary circuit module, passes through diode VD1It is midpoint O current potentials to make A point current potentials clamper in circuit, therefore, now
Switching tube S1The voltage born is bridge arm voltage on device.After the Δ t times, controller passes through the first pwm signal output channel control
Switching tube S in auxiliary circuit module processed1Conducting.So successively circulation step S52-S55, until moving on to error on midpoint potential
In the range of permission.
Fig. 3,4 are shown staggers the time switching tube S after break-make control according to the use of the present embodiment1、S2Bear voltage and control is believed
Number oscillogram.
In summary, technical scheme, three level subway energy back feed device neutral-point potential balances can be realized
Control, is not influenceed by device operating mode.For feedback device under idle potentiostatic mode neutral-point potential balance provide it is a kind of feasible
Method.Also, controlled using " break-make of staggering the time ", can halve the voltage that the switching tube in device is born, reduce implementation
Cost, there is certain application to engineering practice to be worth.
Claims (9)
1. the neutral-point-potential balance control device of three level energy back feed devices, using the level feedback device of NPC types three, its feature
It is：Including control module, on-off circuit and midpoint potential detection module；Midpoint potential detection module returns with the level of NPC types three
Device connection is presented, including two voltage detection modules and a signal conditioning circuit, two voltage detection modules are respectively used to examine
Survey the upper bridge arm voltage of the level feedback device of NPC types three and lower bridge arm voltage, the upper bridge arm voltage detected, lower bridge arm voltage warp
Exported after signal conditioning circuit processing to control module；Control module according to the upper bridge arm voltage and lower bridge arm voltage detected,
Control is output to the conducting sequential of on-off circuit respective switch pipe, the midpoint to the level feedback device of NPC types three charged or
Electric discharge, realizes neutral-point-potential balance control.
2. the neutral-point-potential balance control device of three level energy back feed device according to claim 1, it is characterised in that：
The control module is provided with four road pwm signal output channels；The on-off circuit includes inductance L and the IGBT being connected in series switches
Pipe S1-S4, IGBT switching tubes S1-S4Midpoint after series connection is connected through inductance L with the midpoint of the level feedback device of NPC types three, IGBT
Switching tube S1-S4Grid be connected respectively with four road pwm signal output channels.
3. the neutral-point-potential balance control device of three level energy back feed device according to claim 2, it is characterised in that：
IGBT switching tubes S2Colelctor electrode and IGBT switching tubes S1Emitter stage connects, IGBT switching tubes S3Emitter stage and IGBT switching tubes S4Collection
Electrode connects, IGBT switching tubes S2Emitter stage IGBT switching tubes S3The tie point C of colelctor electrode is through inductance L and the level feedback of NPC types three
The midpoint connection of device；IGBT switching tubes S1-S4Antiparallel fly-wheel diode VD is respectively equipped between colelctor electrode and emitter stage3、
VD4、VD5、VD6。
4. the neutral-point-potential balance control device of three level energy back feed device according to claim 3, it is characterised in that：
IGBT switching tubes S2Colelctor electrode and IGBT switching tubes S1The tie point A of emitter stage and the midpoint O of the level feedback device of NPC types three it
Between be provided with clamp diode VD1；IGBT switching tubes S3Emitter stage and IGBT switching tubes S4The tie point B of colelctor electrode and the electricity of NPC types three
Clamp diode VD is provided between the midpoint O of flat feedback device2。
5. the neutral-point-potential balance control device of three level energy back feed device according to claim 1, it is characterised in that：
The control module includes AD conversion module and the pi regulator being connected, provided with AD input channels all the way and four road pwm signals
Output channel, AD input channels are connected with signal conditioning circuit, the four road pwm signal output channels switch with on-off circuit respectively
Pipe connects.
6. the neutral-point-potential balance control device of three level energy back feed devices, its feature exist according to claim 1 or 5
In：The control module is output to on-off circuit respective switch pipe by controlling the dutycycle of pwm signal dynamically to adjust
Pwm signal.
7. the three level energy based on the neutral-point-potential balance control device of three level energy back feed devices described in claim 4 return
Present device neutral-point potential balance control method, the control module be provided with AD input channels, the first pwm signal output channel,
Second pwm signal output channel, the 3rd pwm signal output channel and the 4th pwm signal output channel, it is characterised in that described
Neutral-point potential balance control method comprises the following steps：
Step 1, midpoint potential detection module detect upper bridge arm voltage and lower bridge arm voltage respectively by two voltage detection modules；
Step 2, upper bridge arm voltage and lower bridge arm voltage obtained into midpoint potential deviation signal by signal conditioning circuit as difference, and
Midpoint potential deviation signal is transferred to the AD input channels of control module after conditioning；
Step 3, control module carry out judgement processing according to midpoint potential deviation signal：If midpoint potential deviation is more than lower limit threshold
Value U1, and it is less than upper limit threshold U2, then midpoint potential is judged in error range, without control；If midpoint potential deviation
Signal is less than lower threshold U1, then judge on midpoint potential that subsequently into upper inclined control strategy, control module is adjusted by PI partially
Device controlling switch pipe S3、S4The dutycycle of conducting, to realize balance control；If midpoint potential deviation signal is more than upper limit threshold
U2, then judge under midpoint potential that subsequently into lower inclined control strategy, control module passes through pi regulator controlling switch pipe S partially1、S2
The dutycycle of conducting, to realize balance control.
8. the neutral-point potential balance control method of three level energy back feed device according to claim 7, it is characterised in that
The process of the upper control strategy partially includes：
Midpoint potential deviation signal after perunit is handled, is input in pi regulator by S41, control module, is adjusted by PI
Switching tube S is obtained after device3、S4The dutycycle D of conducting2；
S42, control module pass through the 3rd pwm signal output channel controlling switch pipe S3Conducting, after the Δ t times, control module passes through
4th pwm signal output channel controlling switch pipe S4Conducting；
S43, switching tube S3、S4Conducting, the midpoint O of the level feedback device of NPC types three pass through switching tube S3、S4, inductance L and NPC type
The negative busbar N of three level feedback devices forms loop, and midpoint O gives negative busbar N to discharge by inductance L, makes under midpoint potential starts
Move；
S44, control module are according to dutycycle D2Calculate switching tube S4Duration is turned on, at the end of conducting, passes through the 4th pwm signal
Output channel controlling switch pipe S4Shut-off, passes through clamp diode VD2It is midpoint O current potentials to make tie point B current potentials clamper；By opening
Close pipe S1、S2Antiparallel fly-wheel diode VD3、VD4Continuous current circuit is provided for inductance L, positive bus-bar P passes through fly-wheel diode VD3、
VD4, inductance L give midpoint O electric discharge, make midpoint potential start to move down；After the Δ t times, control module is exported by the 3rd pwm signal
Passage controlling switch pipe S3Shut-off, tie point B current potentials clamper are midpoint O current potentials, fly-wheel diode VD3、VD4Conducting, tie point C
Current potential clamper is positive bus-bar P point current potentials；
S45, switching tube S3、S4Shut-off, bears DC bus-bar voltage, realizes static state voltage equipoise jointly；
Repetitive cycling step S42-45, in the range of midpoint potential moves down into error permission.
9. the neutral-point potential balance control method of three level energy back feed device according to claim 7, it is characterised in that
The process of the lower control strategy partially includes：
Midpoint potential deviation signal after perunit is handled, is input in pi regulator by S51, control module, is adjusted by PI
Switching tube S is obtained after device1、S2The dutycycle D of conducting1；
S52, control module pass through the second pwm signal output channel controlling switch pipe S2Conducting, after the Δ t times, control module passes through
First pwm signal output channel controlling switch pipe S1Conducting；
S53, switching tube S1、S2Conducting, the positive bus-bar P of the level feedback device of NPC types three pass through switching tube S1、S2, inductance L and NPC
The midpoint O of the level feedback device of type three forms loop, and positive bus-bar P gives midpoint O to charge by inductance L, makes on midpoint potential starts
Move；
S54, control module are according to dutycycle D1Calculate switching tube S1Conducting duration, at the end of conducting, pass through the first PWM letter
Number output channel controlling switch pipe S1Shut-off, now on-off circuit passes through clamp diode VD1Make during tie point A current potential clampers are
Point O current potentials；Pass through switching tube S3、S4Antiparallel fly-wheel diode VD5、VD6Continuous current circuit is provided for inductance L, negative busbar N leads to
Cross VD5、VD6, inductance L give midpoint O charging, make midpoint potential start to move up；After the Δ t times, control module is believed by the 2nd PWM
Number output channel controlling switch pipe S2Shut-off, tie point A current potentials clamper are midpoint O current potentials, fly-wheel diode VD5、VD6Conducting, even
Contact C current potentials clamper is negative busbar N point current potentials；
S55, switching tube S1、S2Shut-off, bears DC bus-bar voltage, realizes static state voltage equipoise jointly；
Repetitive cycling step S52-S55, in the range of error is moved on on midpoint potential and is allowed.
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