CN105048508B - A kind of control method and system of T-shaped tri-level single phase combining inverter - Google Patents
A kind of control method and system of T-shaped tri-level single phase combining inverter Download PDFInfo
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Abstract
This application discloses a kind of control method and system of T-shaped tri-level single phase combining inverter, this method includes：Obtain line voltage, inverter output current and the DC bus-bar voltage at current time；Calculate the reference output voltage of inverter under current time；Calculate the functional value of default control object function under each on off state, it regard a minimum target function value of numerical value in obtain nine target function values as optimal objective function value, and according to the optimal objective function value, determine the optimal DC bus-bar voltage of subsequent time.The application is on the basis of default control object function is constructed, pass through limited on off state model, and then realize the PREDICTIVE CONTROL to subsequent time DC bus-bar voltage, thus it just can realize and inverter active power, reactive power and neutral voltage balancing are controlled, without closing inner ring using complicated PWM controls and electric current, so as to simplify the control process of T-shaped tri-level single phase combining inverter.
Description
Technical field
The present invention relates to combining inverter control technology field, more particularly to a kind of T-shaped tri-level single phase combining inverter
Control method and system.
Background technology
In recent years, as energy resource consumption increases year by year, conventional energy resource increasingly depleted, the regenerative resource such as solar energy and wind energy
Rapidly developed.The bridge that combining inverter is connected as distributed generation system with power network, is distributed generation system
Core.Wherein, T-shaped tri-level single phase combining inverter is a kind of important combining inverter, and there is less power to open for it
The advantages of closing pipe and high inverter efficiency.
Prior art, which is mainly, passes through the PI control methods under dq rotating coordinate systems or the quasi-resonance control under rest frame
The control methods such as method are controlled to T-shaped tri-level single phase combining inverter.However, these control methods all refer to PWM
(Pulse Width Modulation, pulse width modulation) is controlled and electric current closes inner ring, cause its control process complex,
Flexibility is poor.
In summary as can be seen that how to simplify the control process of T-shaped tri-level single phase combining inverter, so as to improve control
Flexibility ratio processed is current urgent problem to be solved.
The content of the invention
In view of this, it is an object of the invention to provide a kind of control method of T-shaped tri-level single phase combining inverter and
System, simplifies the control process of T-shaped tri-level single phase combining inverter, so as to improve control flexibility ratio.Its concrete scheme
It is as follows：
A kind of control method of T-shaped tri-level single phase combining inverter, applied to T-shaped tri-level single phase combining inverter,
The inverter includes power switch pipe collection, and the power switch pipe collection includes the first power switch pipe group positioned at a phase bridge arms
With the second power switch pipe group positioned at b phase bridge arms, each power switch pipe group includes four power switch pipes；Wherein, institute
Nine kinds of on off states can be formed by stating power switch pipe collection；Methods described includes：
Line voltage, inverter output current and the DC bus-bar voltage at current time are obtained, wherein, the inverter is defeated
Go out output current of the electric current for a phases bridge arm or the b phases bridge arm, the DC bus-bar voltage includes positive pole line voltage and negative
Busbar voltage；
Using the line voltage and the inverter output current, the reference for calculating the inverter under current time is defeated
Go out voltage；
Utilize the reference output voltage, the inverter output current, the DC bus-bar voltage at current time and described
Nine kinds of on off states, calculate the functional value of default control object function under each on off state respectively, and nine are obtained accordingly
Target function value；The default control object function is the predetermined function for being used to calculate neutral point voltage departure degree；
Using a minimum target function value of numerical value in nine target function values as optimal objective function value, and root
According to the optimal objective function value, the optimal DC bus-bar voltage of subsequent time is determined.
It is preferred that, it is described to utilize the line voltage and the inverter output current, calculate described inverse under current time
The process for becoming the reference output voltage of device is specifically included：
Using linear interpolation method, the reference output current to the inverter under current time and historical juncture enters row interpolation
Computing, obtains the reference output current of inverter described in subsequent time, wherein, the reference output current of the inverter is described
The reference output current of a phases bridge arm or the b phases bridge arm；
Electricity is exported using the reference of inverter described in the line voltage, the inverter output current and subsequent time
Stream, calculating obtains the reference output voltage.
It is preferred that, it is described to utilize the reference output voltage, the inverter output current, the dc bus at current time
Voltage and nine kinds of on off states, calculate the functional value of default control object function under each on off state, accordingly respectively
The process for obtaining nine target function values include：
Using the DC bus-bar voltage and nine kinds of on off states at current time, calculate respectively described inverse under current time
Output voltage corresponding to each on off state of change device, is correspondingly made available nine output voltage values；
Utilize the inverter output current, the DC bus-bar voltage at current time and nine kinds of on off states, difference
The DC bus-bar voltage corresponding to each on off state of inverter described in subsequent time is calculated, nine groups of direct currents are correspondingly made available female
Line voltage value, wherein, one group of d-c bus voltage value includes a positive bus-bar magnitude of voltage and a negative busbar magnitude of voltage；
Utilize the reference output voltage, nine output voltage values and nine groups of d-c bus voltage values, difference
The functional value of the default control object function under each on off state is calculated, nine object functions are obtained accordingly
Value；Wherein described nine target function values are corresponded with nine groups of d-c bus voltage values.
It is preferred that, it is described according to the optimal objective function value, determine the process of the optimal DC bus-bar voltage of subsequent time
Including：
Optimal straight of subsequent time will be defined as with one group of d-c bus voltage value corresponding to the optimal objective function value
Flow the magnitude of voltage of busbar voltage.
It is preferred that, the default control object function is：
Wherein,For the reference output voltage, uab(k) output voltage values, V are representedp(k+1) represent next
The positive bus-bar magnitude of voltage at moment, Vn(k+1) the negative busbar magnitude of voltage of subsequent time, λ are representedvFor neutral voltage balancing weight system
Number.
It is preferred that, λvValue be 0.3.
The invention also discloses a kind of control system of T-shaped tri-level single phase combining inverter, applied to T-shaped tri-level single
Phase combining inverter, the inverter includes power switch pipe collection, and the power switch pipe collection includes first positioned at a phase bridge arms
Power switch pipe group and the second power switch pipe group positioned at b phase bridge arms, each power switch pipe group are opened including four power
Guan Guan；Wherein, the power switch pipe collection can form nine kinds of on off states；The system includes：
Data acquisition module, line voltage, inverter output current and DC bus-bar voltage for obtaining current time,
Wherein, the inverter output current is the output current of a phases bridge arm or the b phases bridge arm；
First computing module, for utilizing the line voltage and the inverter output current, is calculated under current time
The reference output voltage of the inverter；
Second computing module, for using the reference output voltage, the inverter output current, current time it is straight
Busbar voltage and nine kinds of on off states are flowed, the function of default control object function under each on off state is calculated respectively
Value, obtains nine target function values accordingly；The default control object function is used to calculate neutral point electricity to be predetermined
Press the function of departure degree；
Voltage determination module, for using a minimum target function value of numerical value in nine target function values as most
Excellent target function value, and according to the optimal objective function value, determine the optimal DC bus-bar voltage of subsequent time.
It is preferred that, first computing module includes：
First computing unit, for utilizing linear interpolation method, to the ginseng of the inverter under current time and historical juncture
Examine output current and carry out interpolation arithmetic, obtain the reference output current of inverter described in subsequent time, wherein, the inverter
With reference to the reference output current that output current is a phases bridge arm or the b phases bridge arm；
Second computing unit, it is inverse described in the line voltage, the inverter output current and subsequent time for utilizing
Become the reference output current of device, calculating obtains the reference output voltage.
It is preferred that, second computing module includes：
3rd computing unit, for the DC bus-bar voltage and nine kinds of on off states using current time, is counted respectively
The output voltage corresponding to each on off state of the inverter under current time is calculated, nine output voltages are correspondingly made available
Value；
4th computing unit, for utilizing the inverter output current, the DC bus-bar voltage at current time and described
Nine kinds of on off states, calculate the DC bus-bar voltage described in subsequent time corresponding to each on off state of inverter, phase respectively
Obtain nine groups of d-c bus voltage values with answering；
5th computing unit, for using the reference output voltage, nine output voltage values and it is described nine groups it is straight
Bus voltage value is flowed, the functional value of the default control object function under each on off state is calculated respectively, is obtained accordingly
Nine target function values；Wherein described nine target function values are corresponded with nine groups of d-c bus voltage values.
It is preferred that, the default control object function is：
Wherein,For the reference output voltage, uab(k) output voltage values, V are representedp(k+1) represent next
The positive bus-bar magnitude of voltage at moment, Vn(k+1) the negative busbar magnitude of voltage of subsequent time, λ are representedvFor neutral voltage balancing weight system
Number.
In the present invention, the control method of T-shaped tri-level single phase combining inverter includes：Obtain the power network electricity at current time
Pressure, inverter output current and DC bus-bar voltage；Followed by line voltage and inverter output current, current time is calculated
The reference output voltage of lower inverter；Then reference output voltage, inverter output current, the dc bus at current time are utilized
Voltage and nine kinds of on off states, calculate the functional value of default control object function under each on off state respectively, corresponding to obtain
To nine target function values, wherein, default control object function is used to calculate neutral point voltage departure degree to be predetermined
Function；Finally using a minimum target function value of numerical value in nine target function values as optimal objective function value, and root
According to the optimal objective function value, the optimal DC bus-bar voltage of subsequent time is determined.Therefore, the present invention is utilized for calculating
The default control object function of neutral point voltage departure degree, determines each on off state institute in nine kinds of on off states of inverter
Corresponding target function value, then determines lower a period of time according to a minimum target function value of numerical value in nine target function values
Optimal DC bus-bar voltage is carved, that is, the present invention is opened on the basis of default control object function is constructed by limited
Off status model, and then the PREDICTIVE CONTROL to subsequent time DC bus-bar voltage is realized, thus just can realize has to inverter
Work(power, reactive power and neutral voltage balancing control, without closing inner ring using complicated PWM controls and electric current, it is seen that
This invention simplifies the control process of T-shaped tri-level single phase combining inverter, so as to improve control flexibility ratio.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the topological structure schematic diagram of T-shaped tri-level single phase combining inverter；
Fig. 2 is a kind of control method flow chart of T-shaped tri-level single phase combining inverter disclosed in the embodiment of the present invention；
Fig. 3 is a kind of control method stream of specific T-shaped tri-level single phase combining inverter disclosed in the embodiment of the present invention
Cheng Tu；
Fig. 4 illustrates for a kind of Control system architecture of T-shaped tri-level single phase combining inverter disclosed in the embodiment of the present invention
Figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment of the invention discloses a kind of control method of T-shaped tri-level single phase combining inverter, applied to T-shaped three electricity
Flat single-phase grid-connected inverter, Fig. 1 is the topological structure schematic diagram of T-shaped tri-level single phase combining inverter, and T-shaped tri-level single phase is simultaneously
Net inverter includes power switch pipe collection, and power switch pipe collection is included positioned at the first power switch pipe group of a phase bridge arms and positioned at b
Second power switch pipe group of phase bridge arm, wherein, the first power switch pipe group includes power switch tube S a1, power switch pipe
Sa2, power switch tube S a3 and power switch tube S a4；Second power switch pipe group includes power switch tube S b1, power switch pipe
Sb2, power switch tube S b3 and power switch tube S b4.It should be noted that power switch tube S a1 drive signal and power are opened
The drive signal for closing pipe Sa3 is complementary signal, power switch tube S a2 drive signal and power switch tube S a4 drive signal
For complementary signal, power switch tube S b1 drive signal and power switch tube S b3 drive signal are complementary signal, and power is opened
The drive signal of the drive signal and power switch tube S b4 that close pipe Sb2 is complementary signal.
Wherein, power switch pipe collection, which can be formed, shows above-mentioned nine kinds of on off states in nine kinds of on off states, table 1.
Table 1
| j | Sa1 Sa2 Sa3 Sa4 | Sa | Sb1 Sb2 Sb3 Sb4 | Sb |
| 0 | 1 1 0 0 | 1 | 0 0 1 1 | -1 |
| 1 | 1 1 0 0 | 1 | 0 1 1 0 | 0 |
| 2 | 0 1 1 0 | 0 | 0 0 1 1 | -1 |
| 3 | 0 1 1 0 | 0 | 0 1 1 0 | 0 |
| 4 | 1 1 0 0 | 1 | 1 1 0 0 | 1 |
| 5 | 0 0 1 1 | -1 | 0 0 1 1 | -1 |
| 6 | 0 1 1 0 | 0 | 1 1 0 0 | 1 |
| 7 | 0 0 1 1 | -1 | 0 1 1 0 | 0 |
| 8 | 0 0 1 1 | -1 | 1 1 0 0 | 1 |
Sa in table 1 represents the on off state of a phases, and Sb represents the on off state of b phases；According to power switch on a phase bridge arms
Pipe Sa1~nine kinds of Sa4 it is different cut-off state, can correspondingly determine the on off state Sa of a phases；According to work(on b phase bridge arms
Rate switching tube Sb1~nine kinds of Sb4 it is different cut-off state, can correspondingly determine each in the on off state Sb of a phases, table 1
Correspondence numeral 1 when power switch pipe is opened, correspondence numeral 0 during shut-off.When Sa or Sb is 1, output and bus electricity are represented
Positive pressure pole P points are connected；When Sa or Sb is 0, represent that output is connected with busbar voltage neutral point O point；When Sa or Sb is -1
When, represent that output is connected with busbar voltage negative pole N points.From table 1 it follows that T-shaped tri-level single phase combining inverter
The on off state of middle power switch pipe collection formation is represented by：
Sj=[Sa Sb]T；
Wherein, j=0 ..., 8；It can be seen that, the switch shape of power switch pipe collection formation in T-shaped tri-level single phase combining inverter
State has nine kinds.
Fig. 2 shows the control method of T-shaped tri-level single phase combining inverter disclosed in the embodiment of the present invention, this method bag
Include：
Step S11：Line voltage, inverter output current and the DC bus-bar voltage at current time are obtained, wherein, inversion
Device output current is the output current of a phases bridge arm or b phase bridge arms, and DC bus-bar voltage includes positive pole line voltage and negative busbar electricity
Pressure；
Step S12：Using line voltage and inverter output current, the reference output electricity of inverter under current time is calculated
Pressure；
Step S13：Utilize reference output voltage, inverter output current, the DC bus-bar voltage at current time and nine kinds
On off state, calculates the functional value of default control object function under each on off state respectively, and nine targets are obtained accordingly
Functional value；Default control object function is the predetermined function for being used to calculate neutral point voltage departure degree；
Step S14：Using a minimum target function value of numerical value in nine target function values as optimal objective function value,
And according to the optimal objective function value, determine the optimal DC bus-bar voltage of subsequent time.
In the embodiment of the present invention, the control method of T-shaped tri-level single phase combining inverter includes：Obtain the electricity at current time
Net voltage, inverter output current and DC bus-bar voltage；Followed by line voltage and inverter output current, calculate current
The reference output voltage of inverter under moment；Then reference output voltage, inverter output current, the direct current at current time are utilized
Busbar voltage and nine kinds of on off states, calculate the functional value of default control object function under each on off state, accordingly respectively
Obtain nine target function values, wherein, default control object function for it is predetermined be used for calculate neutral point voltage deviation
The function of degree；Finally using a minimum target function value of numerical value in nine target function values as optimal objective function value,
And according to the optimal objective function value, determine the optimal DC bus-bar voltage of subsequent time.
Therefore, the embodiment of the present invention utilizes the default control target letter for calculating neutral point voltage departure degree
Number, determines the target function value corresponding to each on off state in nine kinds of on off states of inverter, then according to nine targets
A minimum target function value of numerical value determines DC bus-bar voltage that subsequent time is optimal in functional value, that is, of the invention
Embodiment by limited on off state model, and then is realized under on the basis of default control object function is constructed
The PREDICTIVE CONTROL of one moment DC bus-bar voltage, thus just can be realized to inverter active power, reactive power and neutral point electricity
Weighing apparatus control is flattened, without closing inner ring using complicated PWM controls and electric current, it is seen that the embodiment of the present invention simplifies T-shaped three electricity
The control process of flat single-phase grid-connected inverter, so as to improve control flexibility ratio.
The embodiment of the invention discloses a kind of control method of specific T-shaped tri-level single phase combining inverter, referring to Fig. 3
Shown, relative to a upper embodiment, the present embodiment expands further instruction and optimization to technical scheme.It is specific as follows：
Upper embodiment step S12 can specifically include：
Step S121：Using linear interpolation method, the reference output current to inverter under current time and historical juncture is entered
Row interpolation computing, obtains the reference output current of subsequent time inverter, wherein, the reference output current of inverter is a phase bridges
The reference output current of arm or b phase bridge arms；
Step S122：Utilize the reference output current of line voltage, inverter output current and subsequent time inverter, meter
Calculation obtains reference output voltage.
Further, upper embodiment step S13 can specifically include：
Step S131：Using the DC bus-bar voltage at current time and nine kinds of on off states, calculate respectively under current time
Output voltage corresponding to each on off state of inverter, is correspondingly made available nine output voltage values；
Step S132：Utilize inverter output current, the DC bus-bar voltage at current time and nine kinds of on off states, difference
DC bus-bar voltage corresponding to each on off state of calculating subsequent time inverter, is correspondingly made available nine groups of dc bus electricity
Pressure value, wherein, one group of d-c bus voltage value includes a positive bus-bar magnitude of voltage and a negative busbar magnitude of voltage；
Step S133：Using reference output voltage, nine output voltage values and nine groups of d-c bus voltage values, calculate respectively
The functional value of default control object function under each on off state, obtains nine target function values accordingly；Wherein nine mesh
Offer of tender numerical value and nine groups of d-c bus voltage values are corresponded.
Further, upper embodiment step S14 can specifically include：
Step S141：It regard a minimum target function value of numerical value in nine target function values as optimal objective function
Value；
Step S142：Subsequent time will be defined as with one group of d-c bus voltage value corresponding to the optimal objective function value
The magnitude of voltage of optimal DC bus-bar voltage.
The embodiment of the invention discloses the control method of another specific T-shaped tri-level single phase combining inverter, relatively
In a upper embodiment, the present embodiment expands further instruction and optimization to technical scheme.It is specific as follows：
Obtain the line voltage e at current timeg(k), inverter output current ia(k) (it is herein the output electricity of a phase bridge arms
Stream), positive pole line voltage Vp(k) with negative busbar voltage Vn(k)。
Using linear interpolation method, reference output current, (k-1) moment inversion to current time (i.e. k moment) inverter
The reference output current of device and the reference output current of (k-2) moment inverter carry out interpolation arithmetic, obtain subsequent time (i.e. k+
1 moment) reference output current, specific formula is：
Wherein, the reference output current of above-mentioned inverter refers to the reference output current of a phase bridge arms.
Utilize line voltage eg(k), inverter output current ia(k) with the reference output current of subsequent time inverterCalculating obtains reference output voltageSpecifically formula is：
Wherein, L represents inductance, TsRepresent the sampling period；
Utilize positive pole line voltage Vp(k), negative busbar voltage Vn(k) with nine kinds of on off states, current time subinverse is calculated respectively
Output voltage corresponding to each on off state of change device, is correspondingly made available nine output voltage values uab(k), specific formula is：
uab(k)=Vp(k)(Sa1-Sb1)+Vn(k)(Sa2-Sb2) (3)
Utilize inverter output current ia(k), positive pole line voltage Vp(k), negative busbar voltage Vn(k) with nine kinds of on off states,
The DC bus-bar voltage corresponding to each on off state of calculating subsequent time inverter, is correspondingly made available nine groups of direct currents female respectively
Line voltage value (including positive bus-bar magnitude of voltage VpAnd negative busbar magnitude of voltage V (k+1)n(k+1)), specific calculation formula is：
Wherein, C1And C2Represent bus capacitor；iC1And i (k)C2(k) it is bus capacitor electric current, (Sa==1) represents to work as Sa
When=1, output 1, as Sa=0, output 0；And (Sa==0), (Sb==1) and (Sb==0) and (Sa==1) situation
Similar, inconvenience herein is repeated.According to above-mentioned formula it is recognised that the work(that the present invention passes through T-shaped tri-level single phase combining inverter
The nine kinds of on off states and inverter output current i of rate switching tube collectiona(k) subsequent time inverter, just can be predicted out each
The d-c bus voltage value corresponding on off state is planted, without utilizing bus capacitor electric current i of the instrument and equipment to inverterC1
And i (k)C2(k) measure, so as to close inner ring without using complicated PWM controls and electric current for the present invention and just can realize to inverse
Important foundation is laid in the control for becoming device.
The derivation of above-mentioned formula (4) is as follows：
It can be derived from Fig. 1, the bus capacitor electric current i of T-shaped tri-level single phase combining inverterC1And i (k)C2(k) can table
It is shown as：
The purpose for balancing control in view of inverter neutral point is the now dc bus to realize bus capacitor energy balance
Electric current idcValue be 0, then have：
In addition, according to nine kinds of on off states of power switch pipe collection in T-shaped tri-level single phase combining inverter and inversion
Device output current iaAnd i (k)b(k) it, can obtain the neutral point current of inverter：
In view of for T-shaped tri-level single phase combining inverter, there is ia(k)=- ib(k) (4-4)
According to formula (4-3) and formula (4-4), formula (4) can be obtained.
On the basis of above-mentioned steps, and then utilize reference output voltageNine output voltage values uab(k) with nine
Group d-c bus voltage value, calculates the functional value of default control object function under each on off state, obtains accordingly respectively
Nine target function values；Wherein, default control object function is：
Wherein,For reference output voltage, uab(k) output voltage values, V are representedp(k+1) subsequent time is being represented just
Bus voltage value, Vn(k+1) the negative busbar magnitude of voltage of subsequent time, λ are representedvFor neutral voltage balancing weight coefficient.Consider
λvBigger, neutral voltage balancing performance is better, when the tracking performance to electric current is then deteriorated, therefore in the present embodiment, preferentially by λv
Value be set to 0.3.Nine target function values obtained using formula are corresponded with nine groups of d-c bus voltage values respectively.
It regard a minimum target function value of numerical value in nine target function values as optimal objective function value；Then will be with
One group of d-c bus voltage value corresponding to the optimal objective function value is defined as the optimal DC bus-bar voltage of subsequent time
Magnitude of voltage, thereby simplify the control process of T-shaped tri-level single phase combining inverter, so as to improve control flexibility ratio.
The embodiment of the invention also discloses a kind of control system of T-shaped tri-level single phase combining inverter, applied to T-shaped three
Level single-phase grid-connected inverter, inverter includes power switch pipe collection, and power switch pipe collection includes the first work(positioned at a phase bridge arms
Rate switching tube group and the second power switch pipe group positioned at b phase bridge arms, each power switch pipe group include four power switch
Pipe；Wherein, power switch pipe collection can form nine kinds of on off states；Shown in Figure 4, the system in the present embodiment includes：
Data acquisition module 11, line voltage, inverter output current and the dc bus electricity for obtaining current time
Pressure, wherein, inverter output current is the output current of a phases bridge arm or b phase bridge arms；
First computing module 12, for utilizing line voltage and inverter output current, calculates inverter under current time
Reference output voltage；
Second computing module 13, for utilizing reference output voltage, inverter output current, the dc bus at current time
Voltage and nine kinds of on off states, calculate the functional value of default control object function under each on off state respectively, corresponding to obtain
To nine target function values；Default control object function is the predetermined letter for being used to calculate neutral point voltage departure degree
Number；
Voltage determination module 14, for using a minimum target function value of numerical value in nine target function values as optimal
Target function value, and according to the optimal objective function value, determine the optimal DC bus-bar voltage of subsequent time.
Specifically, above-mentioned first computing module 12 can include the first computing unit and the second computing unit：Wherein,
First computing unit can be used for utilizing linear interpolation method, and the reference to inverter under current time and historical juncture is defeated
Go out electric current and carry out interpolation arithmetic, obtain the reference output current of subsequent time inverter, wherein, the reference output current of inverter
For the reference output current of a phases bridge arm or the b phases bridge arm；
Second computing unit can be used for the reference using line voltage, inverter output current and subsequent time inverter defeated
Go out electric current, calculating obtains reference output voltage.
Further, the second computing module 13 can specifically include the 3rd computing unit in the present embodiment and the 4th calculating is single
Member：Wherein,
3rd computing unit can be used for the DC bus-bar voltage and nine kinds of on off states using current time, calculates work as respectively
Output voltage under the preceding moment corresponding to each on off state of inverter, is correspondingly made available nine output voltage values；
4th computing unit can be used for utilizing inverter output current, the DC bus-bar voltage at current time and nine kinds of switches
State, the DC bus-bar voltage corresponding to each on off state of calculating subsequent time inverter, is correspondingly made available nine groups respectively
D-c bus voltage value；
5th computing unit can be used for utilizing reference output voltage, nine output voltage values and nine groups of DC bus-bar voltages
Value, calculates the functional value of default control object function under each on off state, nine target function values is obtained accordingly respectively；
Wherein nine target function values and nine groups of d-c bus voltage values are corresponded.
In the present embodiment, default control object function is：
Wherein,For reference output voltage, uab(k) output voltage values, V are representedp(k+1) subsequent time is being represented just
Bus voltage value, Vn(k+1) the negative busbar magnitude of voltage of subsequent time, λ are representedvFor neutral voltage balancing weight coefficient.
On the more specifically function of each computing unit in the present embodiment, respective party disclosed in an embodiment is referred to
Method, will not be repeated here.
In the embodiment of the present invention, the control system of T-shaped tri-level single phase combining inverter includes：Data acquisition module, is used
In the line voltage, inverter output current and the DC bus-bar voltage that obtain current time；First computing module, for utilizing electricity
Net voltage and inverter output current, calculate the reference output voltage of inverter under current time；Second computing module, for profit
With reference output voltage, inverter output current, the DC bus-bar voltage at current time and nine kinds of on off states, calculate respectively every
The functional value of default control object function under a kind of on off state, obtains nine target function values accordingly, wherein, default control
Object function is the predetermined function for being used to calculate neutral point voltage departure degree；, will finally by voltage determination module
A minimum target function value of numerical value is as optimal objective function value in nine target function values, and according to the optimal objective letter
Numerical value, determines the optimal DC bus-bar voltage of subsequent time.
Therefore, the embodiment of the present invention utilizes the default control target letter for calculating neutral point voltage departure degree
Number, determines the target function value corresponding to each on off state in nine kinds of on off states of inverter, then according to nine targets
A minimum target function value of numerical value determines DC bus-bar voltage that subsequent time is optimal in functional value, that is, of the invention
Embodiment by limited on off state model, and then is realized under on the basis of default control object function is constructed
The PREDICTIVE CONTROL of one moment DC bus-bar voltage, thus just can be realized to inverter active power, reactive power and neutral point electricity
Weighing apparatus control is flattened, without closing inner ring using complicated PWM controls and electric current, it is seen that the embodiment of the present invention simplifies T-shaped three electricity
The control process of flat single-phase grid-connected inverter, so as to improve control flexibility ratio.
Finally, in addition it is also necessary to explanation, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between there is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of key elements not only include that
A little key elements, but also other key elements including being not expressly set out, or also include be this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except also there is other identical element in the process including the key element, method, article or equipment.
The control method and system to a kind of T-shaped tri-level single phase combining inverter provided by the present invention are carried out above
It is discussed in detail, specific case used herein is set forth to the principle and embodiment of the present invention, above example
Illustrate the method and its core concept for being only intended to help to understand the present invention；Simultaneously for those of ordinary skill in the art, according to
According to the thought of the present invention, it will change in specific embodiments and applications, in summary, this specification content
It should not be construed as limiting the invention.
Claims (10)
1. a kind of control method of T-shaped tri-level single phase combining inverter, it is characterised in that applied to T-shaped tri-level single phase simultaneously
Net inverter, the inverter includes power switch pipe collection, and the power switch pipe collection includes the first power positioned at a phase bridge arms
Switching tube group and the second power switch pipe group positioned at b phase bridge arms, each power switch pipe group include four power switch pipes；
Wherein, the power switch pipe collection can form nine kinds of on off states；Methods described includes：
Line voltage, inverter output current and the DC bus-bar voltage at current time are obtained, wherein, the inverter output electricity
The output current for a phases bridge arm or the b phases bridge arm is flowed, the DC bus-bar voltage includes positive pole line voltage and negative busbar
Voltage；
Using the line voltage and the inverter output current, the reference output electricity of the inverter under current time is calculated
Pressure；
Utilize the reference output voltage, the inverter output current, the DC bus-bar voltage at current time and described nine kinds
On off state, calculates the functional value of default control object function under each on off state respectively, and nine targets are obtained accordingly
Functional value；The default control object function is the predetermined function for being used to calculate neutral point voltage departure degree；
Using a minimum target function value of numerical value in nine target function values as optimal objective function value, and according to this
Optimal objective function value, determines the optimal DC bus-bar voltage of subsequent time.
2. the control method of T-shaped tri-level single phase combining inverter according to claim 1, it is characterised in that the profit
With the line voltage and the inverter output current, the mistake of the reference output voltage of the inverter under current time is calculated
Journey is specifically included：
Using linear interpolation method, the reference output current to the inverter under current time and historical juncture enters row interpolation fortune
Calculate, obtain the reference output current of inverter described in subsequent time, wherein, the reference output current of the inverter is a
The reference output current of phase bridge arm or the b phases bridge arm；
Utilize the reference output current of inverter described in the line voltage, the inverter output current and subsequent time, meter
Calculation obtains the reference output voltage.
3. the control method of T-shaped tri-level single phase combining inverter according to claim 2, it is characterised in that the profit
With the reference output voltage, the inverter output current, the DC bus-bar voltage at current time and nine kinds of switches shape
State, calculates the functional value of default control object function under each on off state respectively, and nine target function values are obtained accordingly
Process include：
Using the DC bus-bar voltage and nine kinds of on off states at current time, the inverter under current time is calculated respectively
Output voltage corresponding to each on off state, is correspondingly made available nine output voltage values；
Using the inverter output current, the DC bus-bar voltage at current time and nine kinds of on off states, calculate respectively
DC bus-bar voltage corresponding to each on off state of inverter described in subsequent time, is correspondingly made available nine groups of dc bus electricity
Pressure value, wherein, one group of d-c bus voltage value includes a positive bus-bar magnitude of voltage and a negative busbar magnitude of voltage；
Using the reference output voltage, nine output voltage values and nine groups of d-c bus voltage values, calculate respectively
The functional value of the default control object function under each on off state, obtains nine target function values accordingly；Its
Described in nine target function values corresponded with nine groups of d-c bus voltage values.
4. the control method of T-shaped tri-level single phase combining inverter according to claim 3, it is characterised in that described
According to the optimal objective function value, determining the process of the optimal DC bus-bar voltage of subsequent time includes：
It is female by the optimal direct current of subsequent time is defined as with one group of d-c bus voltage value corresponding to the optimal objective function value
The magnitude of voltage of line voltage.
5. the control method of the T-shaped tri-level single phase combining inverter according to any one of Claims 1-4, its feature exists
In the default control object function is：
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Wherein,For the reference output voltage, uab(k) output voltage values, V are representedp(k+1) subsequent time is represented
Positive bus-bar magnitude of voltage, Vn(k+1) the negative busbar magnitude of voltage of subsequent time, λ are representedvFor neutral voltage balancing weight coefficient.
6. the control method of T-shaped tri-level single phase combining inverter according to claim 5, it is characterised in that λvValue
For 0.3.
7. a kind of control system of T-shaped tri-level single phase combining inverter, it is characterised in that applied to T-shaped tri-level single phase simultaneously
Net inverter, the inverter includes power switch pipe collection, and the power switch pipe collection includes the first power positioned at a phase bridge arms
Switching tube group and the second power switch pipe group positioned at b phase bridge arms, each power switch pipe group include four power switch pipes；
Wherein, the power switch pipe collection can form nine kinds of on off states；The system includes：
Data acquisition module, line voltage, inverter output current and DC bus-bar voltage for obtaining current time, its
In, the inverter output current is the output current of a phases bridge arm or the b phases bridge arm；
First computing module, for utilizing the line voltage and the inverter output current, calculates described under current time
The reference output voltage of inverter；
Second computing module, for female using the reference output voltage, the inverter output current, the direct current at current time
Line voltage and nine kinds of on off states, calculate the functional value of default control object function under each on off state, phase respectively
That answers obtains nine target function values；The default control object function is used to calculate neutral point voltage deviation to be predetermined
The function of degree；
Voltage determination module, for regarding a minimum target function value of numerical value in nine target function values as optimal mesh
Offer of tender numerical value, and according to the optimal objective function value, determine the optimal DC bus-bar voltage of subsequent time.
8. the control system of T-shaped tri-level single phase combining inverter according to claim 7, it is characterised in that described
One computing module includes：
First computing unit, for utilizing linear interpolation method, the reference to the inverter under current time and historical juncture is defeated
Go out electric current and carry out interpolation arithmetic, obtain the reference output current of inverter described in subsequent time, wherein, the reference of the inverter
Output current is the reference output current of a phases bridge arm or the b phases bridge arm；
Second computing unit, for utilizing inverter described in the line voltage, the inverter output current and subsequent time
Reference output current, calculating obtain the reference output voltage.
9. the control system of T-shaped tri-level single phase combining inverter according to claim 8, it is characterised in that described
Two computing modules include：
3rd computing unit, for the DC bus-bar voltage and nine kinds of on off states using current time, calculates work as respectively
The output voltage corresponding to the inverter each on off state is inscribed when preceding, nine output voltage values are correspondingly made available；
4th computing unit, for utilizing the inverter output current, the DC bus-bar voltage at current time and described nine kinds
On off state, calculates the DC bus-bar voltage described in subsequent time corresponding to each on off state of inverter, correspondingly respectively
Obtain nine groups of d-c bus voltage values；
5th computing unit, for female using the reference output voltage, nine output voltage values and nine groups of direct currents
Line voltage value, calculates the functional value of the default control object function under each on off state respectively, obtains described accordingly
Nine target function values；Wherein described nine target function values are corresponded with nine groups of d-c bus voltage values.
10. the control system of the T-shaped tri-level single phase combining inverter according to any one of claim 7 to 9, its feature exists
In the default control object function is：
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Wherein,For the reference output voltage, uab(k) output voltage values, V are representedp(k+1) subsequent time is represented
Positive bus-bar magnitude of voltage, Vn(k+1) the negative busbar magnitude of voltage of subsequent time, λ are representedvFor neutral voltage balancing weight coefficient.
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