CN109660111A - A kind of suppressing method and device of mixed type MMC submodule capacitor voltage fluctuation difference - Google Patents
A kind of suppressing method and device of mixed type MMC submodule capacitor voltage fluctuation difference Download PDFInfo
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- CN109660111A CN109660111A CN201910022239.1A CN201910022239A CN109660111A CN 109660111 A CN109660111 A CN 109660111A CN 201910022239 A CN201910022239 A CN 201910022239A CN 109660111 A CN109660111 A CN 109660111A
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- 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
- H02M1/00—Details of apparatus for conversion
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- 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
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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Abstract
The present invention provides the suppressing methods and device of a kind of mixed type MMC submodule capacitor voltage fluctuation difference, when mixed type module multilevel converter ovennodulation steady-state operation, third harmonic voltage correction amount is determined according to system running state, then loop current suppression voltage increment is determined, finally determine the modulation wave voltage of mixed type module multilevel converter, the strategy is able to suppress the voltage fluctuation of capacitor difference of mixed type module multilevel converter full-bridge submodule and half-bridge submodule, the voltage fluctuation of capacitor that can reduce inverter entirety simultaneously is horizontal, lightness effect is obvious, and mixed type module multilevel converter being capable of stable operation.Technical solution provided by the invention introduces third harmonic voltage injection rate, mixed type module multilevel converter full-bridge submodule and half-bridge submodule capacitor voltage can be effectively inhibited to fluctuate difference under the premise of keeping DC bus-bar voltage and constant transmission power, while the submodule capacitor voltage ripple for reducing inverter entirety is horizontal.
Description
Technical field
The present invention relates to flexible DC transmission technology fields, and in particular to a kind of mixed type MMC submodule capacitor voltage wave
Moment different suppressing method and device.
Background technique
Flexible DC transmission is the important equipment for constructing smart grid, and compared with traditional approach, flexible DC transmission is in orphan
Island power supply, the interconnection of the capacity-increasing transformation of urban power distribution network, AC system, large-scale wind power field is grid-connected etc. has stronger technology
Advantage is the strategic choice for changing bulk power grid development pattern.Due to modularization multi-level converter have easily extension, waveform it is good and
The features such as modularized design, is suitable for the occasions such as high-power, is concerned in flexible direct-current transmission field.By half-bridge submodule
The mixing MMC that block and full-bridge submodule are constituted, has both economy and DC Line Fault ride-through capability, has become current research heat
Point is simultaneously gradually used by engineering.
However, compared with Traditional DC current transmission device, the mixed type module multilevel converter of equivalent capability grade
Middle capacitor volume is bigger, thus bring cost can not be ignored.And with the raising of transmission capacity and DC bus-bar voltage grade,
Economic and technical problem caused by capacitor popularization will be more serious.Meanwhile mixed type module multilevel converter is in mistake
Full-bridge submodule has differences with the fluctuation of half-bridge submodule capacitor voltage when modulation operation, and largely affects whole electricity
The fluctuating level for holding voltage causes inverter integral capacitor voltage fluctuation level to increase.The prior art is not able to satisfy mixing mould
Demand of the block multilevel converter to lightness.
Summary of the invention
In order to overcome the above-mentioned multilevel converter full-bridge submodule of mixed type module in the prior art and half-bridge submodule
The deficiency that submodule capacitor voltage fluctuating level increases caused by voltage fluctuation of capacitor has differences, the present invention provide a kind of mixed
Mould assembly MMC submodule capacitor voltage fluctuates the suppressing method and device of difference, when mixed type module multilevel converter is stablized
When operation, third harmonic voltage correction amount is determined according to system operational parameters, then according to the more level changes of current of mixed type moduleization
The bridge arm current of device determines three-phase loop current suppression voltage increment, is then pressed down by third harmonic voltage correction amount and three phase circulations
Voltage increment processed determines the modulation wave voltage of mixed type module multilevel converter, finally by change mixed type module
The modulating wave voltage of multilevel converter reduces submodule capacitor voltage fluctuation, and mixed type module multilevel converter is in energy
On the basis of enough stable operation, the voltage fluctuation of capacitor difference of full-bridge submodule and half-bridge submodule reduces, and modular multilevel changes
Stream device submodule capacitor voltage is integrally fluctuated and is inhibited, and lightness effect is obvious.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
On the one hand, the present invention provides the suppressing method and device of a kind of mixed type MMC submodule capacitor voltage fluctuation difference,
Include:
When mixed type module multilevel converter stable operation, third harmonic voltage is determined according to system operational parameters
Correction amount；
Three-phase loop current suppression voltage increment is determined according to the bridge arm current of mixed type module multilevel converter；
The more level of mixed type moduleization are determined by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of inverter；
Modulation wave voltage by changing mixed type module multilevel converter inhibits full-bridge submodule and half-bridge submodule
The voltage fluctuation of capacitor difference of block, while being also able to suppress Modularized multi-level converter sub-module capacitance voltage and integrally fluctuating.
The stable constraint condition of mixed type module multilevel converter such as following formula:
Wherein, m indicates the voltage modulated ratio of mixed type module multilevel converter,Indicate power-factor angle, UcTable
Show capacitance voltage reference value in submodule, UdcIndicate that DC bus-bar voltage, N indicate single bridge arm submodule number, F indicates single
Bridge arm full-bridge submodule number.
The third harmonic voltage correction amount determines as the following formula:
Wherein, Δ uTHIIndicating third harmonic voltage injection rate, ω is system frequency,For phase angle, k is triple-frequency harmonics electricity
Injection ratio is pressed, expression formula is as follows:
The bridge arm current according to mixed type module multilevel converter determines three-phase loop current suppression voltage increment,
Include:
The bridge arm current of mixed type module multilevel converter is acquired, and determines that how electric mixed type moduleization is according to the following formula
The three-phase internal current of flat inverter:
Wherein, icirjIndicate the inside circulation of mixed type module multilevel converter, j=a, b, c, ipj、injTable respectively
Show the electric current of upper and lower bridge arm in mixed type module multilevel converter；
By icirjAbc/dq transformation is carried out, the d axis component and q of the change of current inside mixed type module multilevel converter are obtained
Axis component i2fdAnd i2fq；
According to the d axis component and q axis component of the change of current inside mixed type module multilevel converter, d axis is determined as the following formula
Loop current suppression voltage increment and q axis loop current suppression voltage increment:
Wherein, ucird_refIndicate d axis loop current suppression voltage increment, ucirq_refIndicate the amendment of q axis loop current suppression voltage
Amount, i2fdIndicate the d shaft current component of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current component of device, i2fd_refIndicate the d shaft current reference value of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference value of mould assembly modularization multi-level converter, kp1、kp2Indicate proportionality coefficient, ki1、ki2Indicate integral coefficient, ω
Indicate system frequency, LarmIndicate bridge arm inductance；
By ucird_refAnd ucirq_refDq/abc transformation is carried out, three-phase loop current suppression voltage increment is obtained.
It is described to determine that mixed type module is more by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of level converter, comprising:
The current reference value of Outer Loop Power Controller output is determined as the following formula:
Wherein, id_refIndicate the d shaft current reference value of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference value of device output, P indicate the active power of mixed type module multilevel converter output, and Q indicates mixed type
The reactive power of modularization multi-level converter output, PrefIndicate the wattful power of mixed type module multilevel converter output
Rate reference value, QrefIndicate the reactive power reference qref of mixed type module multilevel converter output, kp3、kp4Expression ratio system
Number, ki3、ki4Indicate integral coefficient；
According to id_refAnd iq_ref, and the voltage reference value of inner ring current controller output is determined as the following formula:
Wherein, ed_refIndicate the d shaft voltage reference value of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference value of device output, idIndicate the d axis actual current of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual current of device output, kp5、kp6Indicate proportionality coefficient, ki5、ki6Indicate integral coefficient；
By ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video gesture is obtained；
According to third harmonic voltage correction amount uTHI, three-phase virtual video gesture and three-phase loop current suppression voltage increment, and
The modulation wave voltage of mixed type module multilevel converter is determined as the following formula:
Wherein, upj_ref、unj_refIndicate the modulation wave voltage of upper and lower bridge arm in mixed type module multilevel converter,
ej_refIndicate three-phase virtual video gesture, ucirj_refIndicate three-phase loop current suppression voltage increment.
On the other hand, the present invention also provides a kind of mixed type module multilevel converter lightness devices, comprising:
Harmonic wave generator controller, for determining triple-frequency harmonics when mixed type module multilevel converter stable operation
Voltage increment；
The change of current inhibits controller, for determining three phase circulations according to the bridge arm current of mixed type module multilevel converter
Inhibit voltage increment；
Modulating wave voltage controller, for true by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
Determine the modulation wave voltage of mixed type module multilevel converter；
System controller, for reducing submodule capacitor by the modulating wave voltage of mixed type module multilevel converter
Voltage fluctuation.
The harmonic wave generator controller includes:
Judging unit, for judging whether mixed type module multilevel converter is stable according to following constraint conditions, if
Meet constraint condition, mixed type module multilevel converter is stablized:
Wherein, m indicates the voltage modulated ratio of mixed type module multilevel converter,Indicate power-factor angle, UcTable
Show capacitance voltage reference value in submodule, UdcIndicate that DC bus-bar voltage, N indicate single bridge arm submodule number, F indicates single
Bridge arm full-bridge submodule number.
The harmonic oscillator further include:
Third harmonic voltage correction amount determination unit, for determining third harmonic voltage correction amount as the following formula:
Wherein, Δ uTHIIndicating third harmonic voltage injection rate, ω is system frequency,For phase angle, k is triple-frequency harmonics electricity
Injection ratio is pressed, expression formula is as follows:
The loop current suppression device includes:
Three-phase internal current determination unit, for acquiring the bridge arm current of mixed type module multilevel converter, and root
The three-phase internal current of mixed type module multilevel converter is determined according to following formula:
Wherein, icirjIndicate the inside circulation of mixed type module multilevel converter, j=a, b, c, ipj、injTable respectively
Show the electric current of upper and lower bridge arm in mixed type module multilevel converter；
Abc/dq converter unit is used for icirjAbc/dq transformation is carried out, mixed type module multilevel converter is obtained
The d axis component and q axis component i of the internal change of current2fdAnd i2fq；
Loop current suppression voltage increment determination unit, for according to circulation inside mixed type module multilevel converter
D axis component and q axis component determine d axis loop current suppression voltage increment and q axis loop current suppression voltage increment as the following formula:
Wherein, ucird_refIndicate d axis loop current suppression voltage increment, ucirq_refIndicate the amendment of q axis loop current suppression voltage
Amount, i2fdIndicate the d shaft current component of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current component of device, i2fd_refIndicate the d shaft current reference value of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference value of mould assembly modularization multi-level converter, kp1、kp2Indicate proportionality coefficient, ki1、ki2Indicate integral coefficient, ω
Indicate system frequency, LarmIndicate bridge arm inductance；
First dq/abc converter unit is used for ucird_refAnd ucirq_refDq/abc transformation is carried out, the suppression of three phase circulations is obtained
Voltage increment processed.
First controller includes:
Current reference value determination unit, for determining the current reference value of Outer Loop Power Controller output as the following formula:
Wherein, id_refIndicate the d shaft current reference value of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference value of device output, P indicate the active power of mixed type module multilevel converter output, and Q indicates mixed type
The reactive power of modularization multi-level converter output, PrefIndicate the wattful power of mixed type module multilevel converter output
Rate reference value, QrefIndicate the reactive power reference qref of mixed type module multilevel converter output, kp3、kp4Expression ratio system
Number, ki3、ki4Indicate integral coefficient；
Voltage reference value determination unit, for according to id_refAnd iq_ref, and the output of inner ring current controller is determined as the following formula
Voltage reference value:
Wherein, ed_refIndicate the d shaft voltage reference value of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference value of device output, idIndicate the d axis actual current of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual current of device output, kp5、kp6Indicate proportionality coefficient, ki5、ki6Indicate integral coefficient；
2nd dq/abc converter unit is used for ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video gesture is obtained；
Modulating wave voltage determination unit, for according to third harmonic voltage correction amount uTHI, three-phase virtual video gesture and three
Phase circulation inhibits voltage increment, and determines the modulation wave voltage of mixed type module multilevel converter as the following formula:
Wherein, upj_ref、unj_refIndicate the modulation wave voltage of upper and lower bridge arm in mixed type module multilevel converter,
ej_refIndicate three-phase virtual video gesture, ucirj_refIndicate three-phase loop current suppression voltage increment.
Compared with the immediate prior art, technical solution provided by the invention is had the advantages that
In mixed type module multilevel converter lightness method provided by the invention, when the more level of mixed type moduleization
When inverter ovennodulation steady-state operation, third harmonic voltage correction amount is determined according to system running state, then determines circulation suppression
Voltage increment processed finally determines that the modulation wave voltage of mixed type module multilevel converter, the strategy are able to suppress mixing
The voltage fluctuation of capacitor difference of type modularization multi-level converter full-bridge submodule and half-bridge submodule, while can reduce the change of current
The voltage fluctuation of capacitor of device entirety is horizontal, and lightness effect is obvious, and mixed type module multilevel converter can stablize fortune
Row.Technical solution provided by the invention introduces third harmonic voltage injection rate, is keeping DC bus-bar voltage and transmission power
Mixed type module multilevel converter full-bridge submodule and half-bridge submodule capacitor can effectively be inhibited under the premise of constant
Voltage fluctuation difference, while the submodule capacitor voltage ripple for reducing inverter entirety is horizontal；
Mixed type module multilevel converter lightness device provided by the invention includes harmonic wave generator controller, circulation
Inhibit controller, modulating wave voltage controller and system controller.Harmonic wave generator controller, it is how electric for working as mixed type moduleization
When flat inverter is stablized, third harmonic voltage correction amount is determined；Loop current suppression controller is changed according to the more level of mixed type moduleization
The bridge arm current of stream device determines three-phase loop current suppression voltage increment；Modulating wave voltage controller, for passing through triple-frequency harmonics electricity
Pressure correction amount and three-phase loop current suppression voltage increment determine the modulation wave voltage of mixed type module multilevel converter；System
Controller reduces submodule capacitor voltage fluctuation for the modulating wave voltage by mixed type module multilevel converter, mixes
Mould assembly modularization multi-level converter can stable operation, lightness effect is obvious；
Technical solution provided by the invention, which has given full play to mixed type MMC, can pass through DC Line Fault without locking, take into account through
It the characteristics of Ji property and control flexibility, can be under the premise of keeping DC bus-bar voltage and constant transmission power, it can be substantially
Degree reduces submodule capacitor voltage fluctuation difference and whole fluctuating level, reduces the cost of submodule capacitor, realizes that modularization is more
The lightness of level converter；
Detailed description of the invention
Fig. 1 is the suppression of mixed type module multilevel converter submodule capacitor voltage fluctuation difference in the embodiment of the present invention
Method method flow diagram processed；
Fig. 2 is third harmonic voltage correction amount determination process figure in the embodiment of the present invention；
Fig. 3 is three-phase loop current suppression voltage increment determination process figure in the embodiment of the present invention；
Fig. 4 is to be realized in the embodiment of the present invention by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
Mixed type module multilevel converter submodule capacitor voltage fluctuates the flow chart of the inhibition of difference；
Fig. 5 is the suppression of mixed type module multilevel converter submodule capacitor voltage fluctuation difference in the embodiment of the present invention
Structure drawing of device processed.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
The embodiment of the invention provides the suppressing methods and dress of a kind of mixed type MMC submodule capacitor voltage fluctuation difference
It sets, specific flow chart is as shown in Figure 1, detailed process is as follows:
S101: when mixed type module multilevel converter is stablized, triple-frequency harmonics electricity is determined according to system operational parameters
Press correction amount；
S102: determine that three-phase loop current suppression voltage is corrected according to the bridge arm current of mixed type module multilevel converter
Amount；
S103: it is corrected by the three-phase loop current suppression voltage that the S101 third harmonic voltage correction amount determined and S102 determine
Measure the modulation wave voltage for determining mixed type module multilevel converter；
S104: full-bridge submodule and half-bridge submodule are inhibited by the modulation wave voltage of mixed type module multilevel converter
The voltage fluctuation of capacitor difference of block, while being also able to suppress Modularized multi-level converter sub-module capacitance voltage and integrally fluctuating.
Wherein, mixed type module multilevel converter includes three phase elements, and each phase element includes a upper bridge arm
With a lower bridge arm, upper bridge arm and lower bridge arm Neutron module number are equal, and submodule includes half-bridge submodule and full-bridge submodule.
In above-mentioned S101, the stable constraint condition of mixed type module multilevel converter such as following formula:
Wherein, m indicates the voltage modulated ratio of mixed type module multilevel converter,Indicate power-factor angle, UcTable
Show capacitance voltage reference value in submodule, UdcIndicate that DC bus-bar voltage, N indicate single bridge arm submodule number, F indicates single
Bridge arm full-bridge submodule number.
Further, third harmonic voltage correction amount determination process as shown in Fig. 2, third harmonic voltage correction amount as the following formula
It determines:
Wherein, Δ uTHIIndicating third harmonic voltage injection rate, ω is system frequency,For phase angle, k is triple-frequency harmonics electricity
Injection ratio is pressed, expression formula is as follows:
In above-mentioned S102, three-phase loop current suppression voltage increment determination process figure is as shown in figure 3, PI indicates proportional integration control
Device processed determines the specific mistake of three-phase loop current suppression voltage increment according to the bridge arm current of mixed type module multilevel converter
Journey is as follows:
1, the bridge arm current of mixed type module multilevel converter is acquired, and determines that mixed type module is more according to the following formula
The three-phase internal current of level converter:
Wherein, icirjIndicate the inside circulation of mixed type module multilevel converter, j=a, b, c, ipj、injTable respectively
Show the electric current of upper and lower bridge arm in mixed type module multilevel converter；
2, by icirjAbc/dq transformation is carried out, the d axis component of the change of current inside mixed type module multilevel converter is obtained
With q axis component i2fdAnd i2fq；
3, according to the d axis component and q axis component of the change of current inside mixed type module multilevel converter, d is determined as the following formula
Axis loop current suppression voltage increment and q axis loop current suppression voltage increment:
Wherein, ucird_refIndicate d axis loop current suppression voltage increment, ucirq_refIndicate the amendment of q axis loop current suppression voltage
Amount, i2fdIndicate the d shaft current component of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current component of device, i2fd_refIndicate the d shaft current reference value of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference value of mould assembly modularization multi-level converter, kp1、kp2Indicate proportionality coefficient, ki1、ki2Indicate integral coefficient, ω
Indicate system frequency, LarmIndicate bridge arm inductance；
4, by ucird_refAnd ucirq_refDq/abc transformation is carried out, three-phase loop current suppression voltage increment is obtained.
In above-mentioned S103, such as Fig. 4, determined by third harmonic voltage correction amount and three-phase loop current suppression voltage increment mixed
The modulation wave voltage of mould assembly modularization multi-level converter, detailed process is as follows:
1, the current reference value of Outer Loop Power Controller output is determined as the following formula:
Wherein, id_refIndicate the d shaft current reference value of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference value of device output, P indicate the active power of mixed type module multilevel converter output, and Q indicates mixed type
The reactive power of modularization multi-level converter output, PrefIndicate the wattful power of mixed type module multilevel converter output
Rate reference value, QrefIndicate the reactive power reference qref of mixed type module multilevel converter output, kp3、kp4Expression ratio system
Number, ki3、ki4Indicate integral coefficient；
2, according to id_refAnd iq_ref, and the voltage reference value of inner ring current controller output is determined as the following formula:
Wherein, ed_refIndicate the d shaft voltage reference value of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference value of device output, idIndicate the d axis actual current of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual current of device output, kp5、kp6Indicate proportionality coefficient, ki5、ki6Indicate integral coefficient；
3, by ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video gesture is obtained；
4, according to Δ uTHI, three-phase virtual video gesture and three-phase loop current suppression voltage increment, and determine mixed type as the following formula
The modulation wave voltage of modularization multi-level converter:
Wherein, upj_ref、unj_refIndicate the modulation wave voltage of upper and lower bridge arm in mixed type module multilevel converter,
ej_refIndicate three-phase virtual video gesture, ucirj_refIndicate three-phase loop current suppression voltage increment.
Based on the same inventive concept, the embodiment of the present invention also provides a kind of mixed type module multilevel converter lightness
Device, structure chart as shown in figure 5, specifically include harmonic oscillator, change of current suppressor, the first controller and second controller, under
Function in face of above three module describes in detail:
Harmonic wave generator controller therein, for being joined according to system when mixed type module multilevel converter is stablized
Number determines third harmonic voltage correction amount；
Loop current suppression controller therein, for determining three according to the bridge arm current of mixed type module multilevel converter
Phase circulation inhibits voltage increment；
Modulating wave voltage controller therein, for being repaired by third harmonic voltage correction amount and three-phase loop current suppression voltage
Positive quantity determines the modulation wave voltage of mixed type module multilevel converter；
System controller therein, for inhibiting full-bridge by the modulation wave voltage of mixed type module multilevel converter
Submodule and half-bridge submodule capacitor voltage fluctuate difference, reduce whole submodule capacitor voltage fluctuation.
Above-mentioned harmonic wave generator controller specifically includes judging unit and third harmonic voltage correction amount determination unit, specifically such as
Under:
1, judging unit, for judging whether mixed type module multilevel converter is stable according to following constraint conditions,
If meeting constraint condition, mixed type module multilevel converter is stablized:
Wherein, m indicates the voltage modulated ratio of mixed type module multilevel converter,Indicate power-factor angle, UcTable
Show capacitance voltage reference value in submodule, UdcIndicate that DC bus-bar voltage, N indicate single bridge arm submodule number, F indicates single
Bridge arm full-bridge submodule number.
2, third harmonic voltage correction amount determination unit, for determining third harmonic voltage correction amount as the following formula:
Wherein, Δ uTHIIndicate third harmonic voltage injection rate, ω is system frequency, and k is third harmonic voltage injection system
Number, expression formula are as follows:
Above-mentioned loop current suppression controller includes three-phase internal current determination unit, abc/dq converter unit, loop current suppression
Voltage increment determination unit and the first dq/abc converter unit, specific as follows:
1, three-phase internal current determination unit, for acquiring the bridge arm current of mixed type module multilevel converter, and
The three-phase internal current of mixed type module multilevel converter is determined according to the following formula:
Wherein, icirjIndicate the inside circulation of mixed type module multilevel converter, j=a, b, c, ipj、injTable respectively
Show the electric current of upper and lower bridge arm in mixed type module multilevel converter；
2, abc/dq converter unit is used for icirjAbc/dq transformation is carried out, the more level changes of current of mixed type moduleization are obtained
The d axis component and q axis component i of the change of current inside device2fdAnd i2fq；
3, loop current suppression voltage increment determination unit, for according to the change of current inside mixed type module multilevel converter
D axis component and q axis component, determine d axis loop current suppression voltage increment and q axis loop current suppression voltage increment as the following formula:
Wherein, ucird_refIndicate d axis loop current suppression voltage increment, ucirq_refIndicate the amendment of q axis loop current suppression voltage
Amount, i2fdIndicate the d shaft current component of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current component of device, i2fd_refIndicate the d shaft current reference value of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference value of mould assembly modularization multi-level converter, kp1、kp2Indicate proportionality coefficient, ki1、ki2Indicate integral coefficient, ω
Indicate system frequency, LarmIndicate bridge arm inductance；
4, the first dq/abc converter unit is used for ucird_refAnd ucirq_refDq/abc transformation is carried out, three phase circulations are obtained
Inhibit voltage increment.
Above-mentioned modulating wave voltage controller includes current reference value determination unit, voltage reference value determination unit, second
Dq/abc converter unit and modulating wave voltage determination unit are specific as follows:
1, current reference value determination unit, for determining the current reference value of Outer Loop Power Controller output as the following formula:
Wherein, id_refIndicate the d shaft current reference value of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference value of device output, P indicate the active power of mixed type module multilevel converter output, and Q indicates mixed type
The reactive power of modularization multi-level converter output, PrefIndicate the wattful power of mixed type module multilevel converter output
Rate reference value, QrefIndicate the reactive power reference qref of mixed type module multilevel converter output, kp3、kp4Expression ratio system
Number, ki3、ki4Indicate integral coefficient；
2, voltage reference value determination unit, for according to id_refAnd iq_ref, and determine that inner ring current controller is defeated as the following formula
Voltage reference value out:
Wherein, ed_refIndicate the d shaft voltage reference value of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference value of device output, idIndicate the d axis actual current of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual current of device output, kp5、kp6Indicate proportionality coefficient, ki5、ki6Indicate integral coefficient；
3, the 2nd dq/abc converter unit is used for ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video is obtained
Gesture；
4, modulating wave voltage determination unit, for according to Δ uTHI, three-phase virtual video gesture and three-phase loop current suppression voltage repairs
Positive quantity, and the modulation wave voltage of mixed type module multilevel converter is determined as the following formula:
Wherein, upj_ref、unj_refIndicate the modulation wave voltage of upper and lower bridge arm in mixed type module multilevel converter,
ej_refIndicate three-phase virtual video gesture, ucirj_refIndicate three-phase loop current suppression voltage increment.
For convenience of description, each section of apparatus described above is divided into various modules with function or unit describes respectively.
Certainly, each module or the function of unit can be realized in same or multiple softwares or hardware when implementing the application.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field can still modify to a specific embodiment of the invention referring to above-described embodiment or
Equivalent replacement, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent replacement
Within bright claims.
Claims (9)
1. a kind of suppressing method and device of mixed type MMC submodule capacitor voltage fluctuation difference characterized by comprising
When mixed type module multilevel converter stable operation, determine that third harmonic voltage is corrected according to system operational parameters
Amount；
Three-phase loop current suppression voltage increment is determined according to the bridge arm current of mixed type module multilevel converter；
The more level changes of current of mixed type moduleization are determined by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of device；
Modulation wave voltage by changing mixed type module multilevel converter inhibits full-bridge submodule and half-bridge submodule
Voltage fluctuation of capacitor difference, while being also able to suppress Modularized multi-level converter sub-module capacitance voltage and integrally fluctuating.
2. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 1
Method, which is characterized in that the stable constraint condition such as following formula of the mixed type module multilevel converter:
Wherein, m indicates the voltage modulated ratio of mixed type module multilevel converter,Indicate power-factor angle, UcIndicate son
Capacitance voltage reference value in module, UdcIndicate that DC bus-bar voltage, N indicate single bridge arm submodule number, F indicates single bridge arm
Full-bridge submodule number.
3. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 1
Method, which is characterized in that the third harmonic voltage correction amount determines as the following formula:
Wherein, Δ uTHIIndicating third harmonic voltage injection rate, ω is system frequency,For phase angle, k is third harmonic voltage note
Enter coefficient, expression formula is as follows:
4. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 1
Method, which is characterized in that the bridge arm current according to mixed type module multilevel converter determines three-phase loop current suppression electricity
Press correction amount, comprising:
The bridge arm current of mixed type module multilevel converter is acquired, and determines that the more level of mixed type moduleization change according to the following formula
Flow circulation inside the three-phase of device:
Wherein, icirjIndicate the inside circulation of mixed type module multilevel converter, j=a, b, c, ipj、injIt respectively indicates mixed
The electric current of upper and lower bridge arm in mould assembly modularization multi-level converter；
By icirjAbc/dq transformation is carried out, the d axis component of the change of current and q axis point inside mixed type module multilevel converter are obtained
Measure i2fdAnd i2fq；
According to the d axis component and q axis component of circulation inside mixed type module multilevel converter, d collar stream is determined as the following formula
Inhibit voltage increment and q axis loop current suppression voltage increment:
Wherein, ucird_refIndicate d axis loop current suppression voltage increment, ucirq_refIndicate q axis loop current suppression voltage increment, i2fd
Indicate the d shaft current component of mixed type module multilevel converter, i2fqIndicate the q of mixed type module multilevel converter
Shaft current component, i2fd_refIndicate the d shaft current reference value of mixed type module multilevel converter, i2fq_refIndicate mixed type
The q shaft current reference value of modularization multi-level converter, kp1、kp2Indicate proportionality coefficient, ki1、ki2Indicate that integral coefficient, ω indicate
System frequency, LarmIndicate bridge arm inductance；
By ucird_refAnd ucirq_refDq/abc transformation is carried out, three-phase loop current suppression voltage increment is obtained.
5. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 1
Method, which is characterized in that described that mixed type is determined by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of modularization multi-level converter, comprising:
The current reference value of Outer Loop Power Controller output is determined as the following formula:
Wherein, id_refIndicate the d shaft current reference value of Outer Loop Power Controller output, iq_refIndicate Outer Loop Power Controller output
Q shaft current reference value, P indicate mixed type module multilevel converter output active power, Q indicate mixed type module
The reactive power of multilevel converter output, PrefIndicate the active power reference of mixed type module multilevel converter output
Value, QrefIndicate the reactive power reference qref of mixed type module multilevel converter output, kp3、kp4Indicate proportionality coefficient, ki3、
ki4Indicate integral coefficient；
According to id_refAnd iq_ref, and the voltage reference value of inner ring current controller output is determined as the following formula:
Wherein, ed_refIndicate the d shaft voltage reference value of inner ring current controller output, eq_refIndicate the output of inner ring current controller
Q shaft voltage reference value, idIndicate the d axis actual current of Outer Loop Power Controller output, iqIndicate Outer Loop Power Controller output
Q axis actual current, kp5、kp6Indicate proportionality coefficient, ki5、ki6Indicate integral coefficient；
By ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video gesture is obtained；
According to third harmonic voltage correction amount uTHI, three-phase virtual video gesture and three-phase loop current suppression voltage increment, and press
Formula determines the modulation wave voltage of mixed type module multilevel converter:
Wherein, upj_ref、unj_refIndicate the modulation wave voltage of upper and lower bridge arm in mixed type module multilevel converter, ej_ref
Indicate three-phase virtual video gesture, ucirj_refIndicate three-phase loop current suppression voltage increment.
6. a kind of inhibition device of mixed type module multilevel converter submodule capacitor voltage fluctuation difference, feature exist
In, comprising:
Harmonic wave generator controller, for determining third harmonic voltage when mixed type module multilevel converter stable operation
Correction amount；
The change of current inhibits controller, for determining three-phase loop current suppression according to the bridge arm current of mixed type module multilevel converter
Voltage increment；
Modulating wave voltage controller, it is mixed for being determined by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of mould assembly modularization multi-level converter；
System controller, for reducing submodule capacitor voltage by the modulating wave voltage of mixed type module multilevel converter
Fluctuation.
7. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 6
Device, which is characterized in that the harmonic wave generator controller device includes:
Judging unit, for judging whether mixed type module multilevel converter is stable according to following constraint conditions, if meeting
Constraint condition, mixed type module multilevel converter are stablized:
Wherein, m indicates the voltage modulated ratio of mixed type module multilevel converter,Indicate power-factor angle, UcIndicate son
Capacitance voltage reference value in module, UdcIndicate that DC bus-bar voltage, N indicate single bridge arm submodule number, F indicates single bridge arm
Full-bridge submodule number.
The inhibition dress of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 6
It sets, which is characterized in that the harmonic oscillator further include:
Third harmonic voltage correction amount determination unit, for determining third harmonic voltage correction amount as the following formula:
Wherein, Δ uTHIIndicating third harmonic voltage injection rate, ω is system frequency,For phase angle, k is third harmonic voltage note
Enter coefficient, expression formula is as follows:
8. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 6
Device, which is characterized in that the change of current suppressor includes:
Three-phase internal current determination unit, for acquiring the bridge arm current of mixed type module multilevel converter, and under
Formula determines the three-phase internal current of mixed type module multilevel converter:
Wherein, icirjIndicate the inside circulation of mixed type module multilevel converter, j=a, b, c, ipj、injIt respectively indicates mixed
The electric current of upper and lower bridge arm in mould assembly modularization multi-level converter；
By icirjAbc/dq transformation is carried out, the d axis component of the change of current and q axis point inside mixed type module multilevel converter are obtained
Measure i2fdAnd i2fq；
Loop current suppression voltage increment determination unit, for the d axis according to the change of current inside mixed type module multilevel converter
Component and q axis component determine d axis loop current suppression voltage increment and q axis loop current suppression voltage increment as the following formula:
Wherein, ucird_refIndicate d axis loop current suppression voltage increment, ucirq_refIndicate q axis loop current suppression voltage increment, i2fd
Indicate the d shaft current component of mixed type module multilevel converter, i2fqIndicate the q of mixed type module multilevel converter
Shaft current component, i2fd_refIndicate the d shaft current reference value of mixed type module multilevel converter, i2fq_refIndicate mixed type
The q shaft current reference value of modularization multi-level converter, kp1、kp2Indicate proportionality coefficient, ki1、ki2Indicate that integral coefficient, ω indicate
System frequency, LarmIndicate bridge arm inductance；
First dq/abc converter unit is used for ucird_refAnd ucirq_refDq/abc transformation is carried out, three-phase loop current suppression electricity is obtained
Press correction amount.
9. the inhibition of mixed type module multilevel converter submodule capacitor voltage fluctuation difference according to claim 6
Device, which is characterized in that first controller includes:
Current reference value determination unit, for determining the current reference value of Outer Loop Power Controller output as the following formula:
Wherein, id_refIndicate the d shaft current reference value of Outer Loop Power Controller output, iq_refIndicate Outer Loop Power Controller output
Q shaft current reference value, P indicate mixed type module multilevel converter output active power, Q indicate mixed type module
The reactive power of multilevel converter output, PrefIndicate the active power reference of mixed type module multilevel converter output
Value, QrefIndicate the reactive power reference qref of mixed type module multilevel converter output, kp3、kp4Indicate proportionality coefficient, ki3、
ki4Indicate integral coefficient；
Voltage reference value determination unit, for according to id_refAnd iq_ref, and the electricity of inner ring current controller output is determined as the following formula
Press reference value:
Wherein, ed_refIndicate the d shaft voltage reference value of inner ring current controller output, eq_refIndicate the output of inner ring current controller
Q shaft voltage reference value, idIndicate the d axis actual current of Outer Loop Power Controller output, iqIndicate Outer Loop Power Controller output
Q axis actual current, kp5、kp6Indicate proportionality coefficient, ki5、ki6Indicate integral coefficient；
2nd dq/abc converter unit is used for ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video gesture is obtained；
Modulating wave voltage determination unit, for according to third harmonic voltage correction amount uTHI, three-phase virtual video gesture and three-phase ring
Stream inhibits voltage increment, and determines the modulation wave voltage of mixed type module multilevel converter as the following formula:
Wherein, upj_ref、unj_refIndicate the modulation wave voltage of upper and lower bridge arm in mixed type module multilevel converter, ej_ref
Indicate three-phase virtual video gesture, ucirj_refIndicate three-phase loop current suppression voltage increment.
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