CN108322073A - A kind of mixed type module multilevel converter lightness method and apparatus - Google Patents
A kind of mixed type module multilevel converter lightness method and apparatus Download PDFInfo
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- CN108322073A CN108322073A CN201810052594.9A CN201810052594A CN108322073A CN 108322073 A CN108322073 A CN 108322073A CN 201810052594 A CN201810052594 A CN 201810052594A CN 108322073 A CN108322073 A CN 108322073A
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Classifications
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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Abstract
The present invention provides a kind of mixed type module multilevel converter lightness method and apparatus, when mixed type module multilevel converter is stablized, determine third harmonic voltage correction amount, then three-phase loop current suppression voltage increment is determined, it finally determines the modulation wave voltage of mixed type module multilevel converter and reduces submodule capacitor voltage fluctuation, lightness is with obvious effects, and mixed type module multilevel converter being capable of stable operation.Technical solution provided by the invention introduces third harmonic voltage correction amount, solve the problems, such as that voltage negative landing occurs in full-bridge submodule when modulation ratio increase, and it gives full play to mixed type MMC and can pass through DC Line Fault without locking, the characteristics of taking into account economy and control flexibility, it can be under the premise of keeping DC bus-bar voltage and constant transmission power, the cost of the degree and submodule capacitance of submodule capacitor voltage fluctuation can be greatly lowered, and realize the lightness of modularization multi-level converter.
Description
Technical field
The present invention relates to flexible DC transmission technology fields, and in particular to a kind of mixed type module multilevel converter is light
Type method and apparatus.
Background technology
Flexible DC power transmission (VSC-HVDC) is the direct current transportation skill of new generation after ac transmission, customary DC transmission of electricity
Art.Flexible DC transmission technology have it is active and reactive can be separately adjustable, light current net access and low voltage ride-through capability it is strong, low friendship
The features such as stream filtering and reactive-load compensation demand.Flexible DC power transmission is the important equipment for building intelligent grid, with traditional approach phase
Than flexible DC power transmission is grid-connected in island with power, the capacity-increasing transformation of urban power distribution network, AC system interconnection, large-scale wind power field
Etc. have stronger technical advantage, be change bulk power grid development pattern strategic choice.Due to the modular multilevel change of current
Device (modular multilevel converter, MMC) have easily extension, waveform is good, fault ride-through capacity is strong and modularization
The features such as design, is suitable for occasions, the MMC such as high-power and is concerned in flexible direct-current transmission field.
However, core equipment of the mixed type module multilevel converter as flexible direct current power transmission system, is still deposited at present
In many bottlenecks.Compared with Traditional DC current transmission device, the more level changes of current of mixed type moduleization of equivalent capability grade
Capacitance volume bigger in device, thus the cost brought can not be ignored.And carrying with transmission capacity and DC bus-bar voltage grade
Height, economic and technical problem caused by capacitance popularization will be more serious.In the prior art since how electric mixed type moduleization is
The busbar voltage fluctuation of flat transverter is larger, and mixed type module multilevel converter is caused to be unable to stable operation and lightness effect
Fruit is poor.
Invention content
It is led to overcome the busbar voltage fluctuation of the above-mentioned multilevel converter of mixed type module in the prior art larger
The deficiency of the lightness effect difference of cause, a kind of mixed type module multilevel converter lightness method of present invention offer and dress
It sets, when mixed type module multilevel converter is stablized, third harmonic voltage correction amount is determined, then according to mixed type module
The bridge arm current for changing multilevel converter determines three-phase loop current suppression voltage increment, then passes through third harmonic voltage correction amount
The modulation wave voltage that mixed type module multilevel converter is determined with three-phase loop current suppression voltage increment, finally by mixing
The modulating wave voltage of type modularization multi-level converter reduces submodule capacitor voltage fluctuation, and the more level of mixed type moduleization change
Flow device can stable operation, lightness is with obvious effects.
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 a kind of mixed type module multilevel converter lightness method, including：
When mixed type module multilevel converter is stablized, third harmonic voltage correction amount is determined；
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 transverter；
Submodule capacitor voltage fluctuation is reduced by the modulating wave voltage of mixed type module multilevel converter.
The constraints such as following formula that mixed type module multilevel converter is stablized：
Wherein, m indicates that the voltage modulated ratio of mixed type module multilevel converter, p indicate voltage modulated than the upper limit, andN2Indicate full-bridge submodule number, UcIndicate capacitance voltage reference value in submodule, UdcIndicate DC bus
Voltage, N indicate bridge arm submodule number.
The third harmonic voltage correction amount determines as the following formula：
Δ v=(1/2) [max (UA,UB,UC)+min(UA,UB,UC)]
Wherein, Δ v indicates third harmonic voltage correction amount, UA、UB、UCIndicate mixed type module multilevel converter
Three-phase alternating voltage reference value.
The bridge arm current according to mixed type module multilevel converter determines three-phase loop current suppression voltage increment,
Including：
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 transverter：
Wherein, icirjIndicate the three-phase internal current of mixed type module multilevel converter, j=a, b, c, ipjIndicate mixed
The electric current of upper bridge arm, i in mould assembly modularization multi-level converternjIndicate lower bridge arm in mixed type module multilevel converter
Electric current；
By icirjAbc/dq transformation is carried out, the d axis components and q of the change of current inside mixed type module multilevel converter are obtained
Axis component；
According to the d axis components and q axis components 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 increments：
Wherein, ucird_refIndicate d axis loop current suppression voltage increments, ucirq_refIndicate q axis loop current suppression voltage amendments
Amount, i2fdIndicate the d shaft current components of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current components of device, i2fd_refIndicate the d shaft current reference values of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference values of mould assembly modularization multi-level converter, k1、k3Indicate proportionality coefficient, k2、k4Indicate integral coefficient, ω tables
Show angular 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, including：
The current reference value of Outer Loop Power Controller output is determined as the following formula：
Wherein, id_refIndicate the d shaft current reference values of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference values of device output, P indicate that the active power of mixed type module multilevel converter output, Q indicate 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, k5、k7Expression ratio system
Number, k6、k8Indicate 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 values of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference values of device output, idIndicate the d axis actual currents of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual currents of device output, k9、k11Indicate proportionality coefficient, k10、k12Indicate 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 v, three-phase virtual video gesture and three-phase loop current suppression voltage increment, and press
Following formula determines the modulation wave voltage of mixed type module multilevel converter：
Wherein, upj_refIndicate the modulation wave voltage of upper bridge arm in mixed type module multilevel converter, unj_refIt indicates
The modulation wave voltage of lower bridge arm, e in mixed type module multilevel converterj_refIndicate three-phase virtual video gesture, ucirj_refTable
Show 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, including：
Harmonic oscillator, for when mixed type module multilevel converter is stablized, determining third harmonic voltage amendment
Amount；
Change of current suppressor determines three-phase loop current suppression voltage according to the bridge arm current of mixed type module multilevel converter
Correction amount；
First controller, for determining mixing by third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of type modularization multi-level converter；
Second controller, for reducing submodule capacitance by the modulating wave voltage of mixed type module multilevel converter
Voltage fluctuation.
The harmonic oscillator includes：
Judging unit, for judging whether mixed type module multilevel converter is stablized according to following constraintss, if
Meet constraints, mixed type module multilevel converter is stablized：
Wherein, m indicates that the voltage modulated ratio of mixed type module multilevel converter, p indicate voltage modulated than the upper limit, andN2Indicate full-bridge submodule number, UcIndicate capacitance voltage reference value in submodule, UdcIndicate DC bus
Voltage, N indicate bridge arm submodule number.
The harmonic oscillator further includes：
Third harmonic voltage correction amount determination unit, for determining third harmonic voltage correction amount as the following formula：
Δ v=(1/2) [max (UA,UB,UC)+min(UA,UB,UC)]
Wherein, Δ v indicates third harmonic voltage correction amount, UA、UB、UCIndicate mixed type module multilevel converter
Three-phase alternating voltage reference value.
The change of current suppressor includes：
Three-phase internal current determination unit, the bridge arm current for acquiring 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 three-phase internal current of mixed type module multilevel converter, j=a, b, c, ipjIndicate mixed
The electric current of upper bridge arm, i in mould assembly modularization multi-level converternjIndicate lower bridge arm in mixed type module multilevel converter
Electric current；
Abc/dq converter units are used for icirjAbc/dq transformation is carried out, mixed type module multilevel converter is obtained
The d axis components and q axis components of the internal change of current；
Loop current suppression voltage increment determination unit, for according to the change of current inside mixed type module multilevel converter
D axis components and q axis components determine d axis loop current suppression voltage increments and q axis loop current suppression voltage increments as the following formula：
Wherein, ucird_refIndicate d axis loop current suppression voltage increments, ucirq_refIndicate q axis loop current suppression voltage amendments
Amount, i2fdIndicate the d shaft current components of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current components of device, i2fd_refIndicate the d shaft current reference values of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference values of mould assembly modularization multi-level converter, k1、k3Indicate proportionality coefficient, k2、k4Indicate integral coefficient, ω tables
Show angular frequency, LarmIndicate bridge arm inductance；
First dq/abc converter units are 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, the current reference value for determining Outer Loop Power Controller output as the following formula：
Wherein, id_refIndicate the d shaft current reference values of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference values of device output, P indicate that the active power of mixed type module multilevel converter output, Q indicate 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, k5、k7Expression ratio system
Number, k6、k8Indicate integral coefficient；
Voltage reference value determination unit, for according to id_refAnd iq_ref, and inner ring current controller output is determined as the following formula
Voltage reference value：
Wherein, ed_refIndicate the d shaft voltage reference values of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference values of device output, idIndicate the d axis actual currents of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual currents of device output, k9、k11Indicate proportionality coefficient, k10、k12Indicate integral coefficient；
2nd dq/abc converter units are 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 v, 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_refIndicate the modulation wave voltage of upper bridge arm in mixed type module multilevel converter, unj_refIt indicates
The modulation wave voltage of lower bridge arm, e in mixed type module multilevel converterj_refIndicate three-phase virtual video gesture, ucirj_refTable
Show three-phase loop current suppression voltage increment.
Compared with the immediate prior art, technical solution provided by the invention has the advantages that：
In mixed type module multilevel converter lightness method provided by the invention, when the more level of mixed type moduleization
When transverter is stablized, third harmonic voltage correction amount is determined, then according to the bridge arm of mixed type module multilevel converter electricity
Stream determines three-phase loop current suppression voltage increment, then passes through third harmonic voltage correction amount and three-phase loop current suppression voltage amendment
Amount determines the modulation wave voltage of mixed type module multilevel converter, finally by mixed type module multilevel converter
Modulating wave voltage reduces submodule capacitor voltage fluctuation.Method provided by the invention is due to can effectively reduce submodule capacitance
Voltage fluctuation, thus mixed type module multilevel converter can stable operation, in stable operation capacitor requirements amount reduce, because
This can realize the lightness of mixed type module multilevel converter；
Mixed type module multilevel converter lightness device provided by the invention includes harmonic oscillator, change of current inhibition
Device, the first controller and second controller, harmonic oscillator are used for when mixed type module multilevel converter is stablized, really
Determine third harmonic voltage correction amount, change of current suppressor determines three according to the bridge arm current of mixed type module multilevel converter
Phase circulation inhibits voltage increment, the first controller, for passing through third harmonic voltage correction amount and three-phase loop current suppression voltage
Correction amount determines the modulation wave voltage of mixed type module multilevel converter, second controller, for passing through mixed type module
Changing the modulating wave voltage of multilevel converter reduces submodule capacitor voltage fluctuation, and mixed type module multilevel converter can
Stable operation, lightness are with obvious effects；
Technical solution provided by the invention, which has given full play to mixed type MMC, to 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 the cost of the degree and submodule capacitance of submodule capacitor voltage fluctuation, and realizes the light of modularization multi-level converter
Type；
Technical solution provided by the invention introduces third harmonic voltage correction amount, full-bridge when solving modulation ratio increase
There is the problem of voltage negative landing in module.
Description of the drawings
Fig. 1 is mixed type module multilevel converter lightness method flow diagram in the embodiment of the present invention；
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 realized by third harmonic voltage correction amount and three-phase loop current suppression voltage increment in the embodiment of the present invention
The flow chart of mixed type module multilevel converter lightness；
Fig. 5 is mixed type module multilevel converter lightness structure drawing of device in the embodiment of the present invention.
Specific implementation mode
Invention is further described in detail below in conjunction with the accompanying drawings.
An embodiment of the present invention provides a kind of mixed type module multilevel converter lightness methods, and particular flow sheet is such as
Shown in Fig. 1, detailed process is as follows：
S101：When mixed type module multilevel converter is stablized, third harmonic voltage correction amount is determined；
S102：Three-phase loop current suppression voltage amendment is determined according to the bridge arm current of mixed type module multilevel converter
Amount；
S103：The three-phase loop current suppression voltage amendment determined by the S101 third harmonic voltage correction amounts determined and S102
Amount determines the modulation wave voltage of mixed type module multilevel converter；
S104：Submodule capacitor voltage fluctuation is reduced by the modulating wave voltage of mixed type module multilevel converter.
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 constraints such as following formula of mixed type module multilevel converter stabilization：
Wherein, m indicates that the voltage modulated ratio of mixed type module multilevel converter, p indicate voltage modulated than the upper limit, andN2Indicate full-bridge submodule number, UcIndicate capacitance voltage reference value in submodule, UdcIndicate DC bus
Voltage, N indicate bridge arm submodule number.
The position that load tap changer can be adjusted makes the voltage modulated ratio of mixed type module multilevel converter to the greatest extent may be used
Mixed type module multilevel converter lightness effect can be made more preferable in this way close to p, load tap changer position meetsUTFor load tap changer position corresponding voltage.
Further, third harmonic voltage correction amount determination process as shown in Fig. 2, third harmonic voltage correction amount as the following formula
It determines：
Δ v=(1/2) [max (UA,UB,UC)+min(UA,UB,UC)]
Wherein, Δ v indicates third harmonic voltage correction amount, UA、UB、UCIndicate mixed type module multilevel converter
Three-phase alternating voltage reference value.
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 three-phase internal current of mixed type module multilevel converter, j=a, b, c, ipjIndicate mixed
The electric current of upper bridge arm, i in mould assembly modularization multi-level converternjIndicate lower bridge arm in mixed type module multilevel converter
Electric current, bridge arm in p expressions, n indicate lower bridge arm；
2, by icirjAbc/dq transformation is carried out, the d axis components of the change of current inside mixed type module multilevel converter are obtained
With q axis components；
3, according to the d axis components and q axis components 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 increments：
Wherein, ucird_refIndicate d axis loop current suppression voltage increments, ucirq_refIndicate q axis loop current suppression voltage amendments
Amount, i2fdIndicate the d shaft current components of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current components of device, i2fd_refIndicate the d shaft current reference values of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference values of mould assembly modularization multi-level converter, k1、k3Indicate proportionality coefficient, k2、k4Indicate integral coefficient, ω tables
Show angular 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 are 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 values of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference values of device output, P indicate that the active power of mixed type module multilevel converter output, Q indicate 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, k5、k7Expression ratio system
Number, k6、k8Indicate 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 values of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference values of device output, idIndicate the d axis actual currents of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual currents of device output, k9、k11Indicate proportionality coefficient, k10、k12Indicate integral coefficient；
3, by ed_ref、eq_refDq/abc transformation is carried out, three-phase virtual video gesture is obtained；
4, according to Δ v, three-phase virtual video gesture and three-phase loop current suppression voltage increment, and mixing mould is determined as the following formula
The modulation wave voltage of block multilevel converter：
Wherein, upj_refIndicate the modulation wave voltage of upper bridge arm in mixed type module multilevel converter, unj_refIt indicates
The modulation wave voltage of lower bridge arm, e in mixed type module multilevel converterj_refIndicate three-phase virtual video gesture, ucirj_refTable
Show three-phase loop current suppression voltage increment.
Based on 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 oscillator therein, for when mixed type module multilevel converter is stablized, determining triple-frequency harmonics electricity
Press correction amount；
Change of current suppressor therein,ForThree-phase ring is determined according to the bridge arm current of mixed type module multilevel converter
Stream inhibits voltage increment；
First controller therein, 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；
Second controller therein, for reducing submodule by the modulating wave voltage of mixed type module multilevel converter
Block voltage fluctuation of capacitor.
Above-mentioned harmonic oscillator specifically includes judging unit and third harmonic voltage correction amount determination unit, specific as follows：
1, judging unit, for judging whether mixed type module multilevel converter is stablized according to following constraintss,
If meeting constraints, mixed type module multilevel converter is stablized：
Wherein, m indicates that the voltage modulated ratio of mixed type module multilevel converter, p indicate voltage modulated than the upper limit, andN2Indicate full-bridge submodule number, UcIndicate capacitance voltage reference value in submodule, UdcIndicate DC bus
Voltage, N indicate bridge arm submodule number.
2, third harmonic voltage correction amount determination unit, for determining third harmonic voltage correction amount as the following formula：
Δ v=(1/2) [max (UA,UB,UC)+min(UA,UB,UC)]
Wherein, Δ v indicates third harmonic voltage correction amount, UA、UB、UCIndicate mixed type module multilevel converter
Three-phase alternating voltage reference value.
Above-mentioned change of current suppressor includes three-phase internal current determination unit, abc/dq converter units, loop current suppression voltage
Correction amount determination unit and the first dq/abc converter units, it is specific as follows：
1, three-phase internal current determination unit, the bridge arm current for acquiring 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 three-phase internal current of mixed type module multilevel converter, j=a, b, c, ipjIndicate mixed
The electric current of upper bridge arm, i in mould assembly modularization multi-level converternjIndicate lower bridge arm in mixed type module multilevel converter
Electric current；
2, abc/dq converter units are used for icirjAbc/dq transformation is carried out, the more level changes of current of mixed type moduleization are obtained
The d axis components and q axis components of the change of current inside device；
3, loop current suppression voltage increment determination unit, for according to the change of current inside mixed type module multilevel converter
D axis components and q axis components, determine d axis loop current suppression voltage increments and q axis loop current suppression voltage increments as the following formula：
Wherein, ucird_refIndicate d axis loop current suppression voltage increments, ucirq_refIndicate q axis loop current suppression voltage amendments
Amount, i2fdIndicate the d shaft current components of mixed type module multilevel converter, i2fqIndicate the more level changes of current of mixed type moduleization
The q shaft current components of device, i2fd_refIndicate the d shaft current reference values of mixed type module multilevel converter, i2fq_refIndicate mixed
The q shaft current reference values of mould assembly modularization multi-level converter, k1、k3Indicate proportionality coefficient, k2、k4Indicate integral coefficient, ω tables
Show angular frequency, LarmIndicate bridge arm inductance；
4, the first dq/abc converter units are used for ucird_refAnd ucirq_refDq/abc transformation is carried out, three phase circulations are obtained
Inhibit voltage increment.
Above-mentioned third module includes current reference value determination unit, voltage reference value determination unit, the 2nd dq/abc changes
It changes unit and modulating wave voltage determination unit is specific as follows：
1, current reference value determination unit, the current reference value for determining Outer Loop Power Controller output as the following formula：
Wherein, id_refIndicate the d shaft current reference values of Outer Loop Power Controller output, iq_refIndicate open sea wharf
The q shaft current reference values of device output, P indicate that the active power of mixed type module multilevel converter output, Q indicate 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, k5、k7Expression ratio system
Number, k6、k8Indicate 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
The voltage reference value gone out：
Wherein, ed_refIndicate the d shaft voltage reference values of inner ring current controller output, eq_refIndicate inner ring current control
The q shaft voltage reference values of device output, idIndicate the d axis actual currents of Outer Loop Power Controller output, iqIndicate open sea wharf
The q axis actual currents of device output, k9、k11Indicate proportionality coefficient, k10、k12Indicate integral coefficient；
3, the 2nd dq/abc converter units are 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 v, three-phase virtual video gesture and three-phase loop current suppression voltage amendment
Amount, and the modulation wave voltage of mixed type module multilevel converter is determined as the following formula：
Wherein, upj_refIndicate the modulation wave voltage of upper bridge arm in mixed type module multilevel converter, unj_refIt indicates
The modulation wave voltage of lower bridge arm, e in mixed type module multilevel converterj_refIndicate three-phase virtual video gesture, ucirj_refTable
Show 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 be provided 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, the application can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The application is with reference to method, the flow 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 can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of 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 count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows 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 with reference to above-described embodiment still can to the present invention specific implementation mode modify 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 (10)
1. a kind of mixed type module multilevel converter lightness method, which is characterized in that including：
When mixed type module multilevel converter is stablized, third harmonic voltage correction amount is determined；
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；
Submodule capacitor voltage fluctuation is reduced by the modulating wave voltage of mixed type module multilevel converter.
2. mixed type module multilevel converter lightness method according to claim 1, which is characterized in that described mixed
The constraints such as following formula that mould assembly modularization multi-level converter is stablized：
Wherein, m indicates that the voltage modulated ratio of mixed type module multilevel converter, p indicate voltage modulated than the upper limit, andN2Indicate full-bridge submodule number, UcIndicate capacitance voltage reference value in submodule, UdcIndicate DC bus
Voltage, N indicate bridge arm submodule number.
3. mixed type module multilevel converter lightness method according to claim 1, which is characterized in that described three
Subharmonic voltage correction amount determines as the following formula：
Δ v=(1/2) [max (UA,UB,UC)+min(UA,UB,UC)]
Wherein, Δ v indicates third harmonic voltage correction amount, UA、UB、UCIndicate the three-phase of mixed type module multilevel converter
Alternating voltage reference value.
4. mixed type module multilevel converter lightness method according to claim 1, which is characterized in that described
Three-phase loop current suppression voltage increment is determined according to the bridge arm current of mixed type module multilevel converter, including：
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 the three-phase internal current of device：
Wherein, icirjIndicate the three-phase internal current of mixed type module multilevel converter, j=a, b, c, ipjIndicate mixed type
The electric current of upper bridge arm, i in modularization multi-level converternjIndicate the electricity of lower bridge arm in mixed type module multilevel converter
Stream；
By icirjAbc/dq transformation is carried out, the d axis components of the change of current and q axis point inside mixed type module multilevel converter are obtained
Amount；
According to the d axis components and q axis components of the change of current inside mixed type module multilevel converter, d collar streams are determined as the following formula
Inhibit voltage increment and q axis loop current suppression voltage increments：
Wherein, ucird_refIndicate d axis loop current suppression voltage increments, ucirq_refIndicate q axis loop current suppression voltage increments, i2fd
Indicate the d shaft current components 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 values of mixed type module multilevel converter, i2fq_refIndicate mixed type
The q shaft current reference values of modularization multi-level converter, k1、k3Indicate proportionality coefficient, k2、k4Indicate that integral coefficient, ω indicate angle
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. mixed type module multilevel converter lightness method according to claim 1, which is characterized in that described logical
It crosses third harmonic voltage correction amount and three-phase loop current suppression voltage increment determines the tune of mixed type module multilevel converter
Wave voltage processed, including：
The current reference value of Outer Loop Power Controller output is determined as the following formula：
Wherein, id_refIndicate the d shaft current reference values of Outer Loop Power Controller output, iq_refIndicate Outer Loop Power Controller output
Q shaft current reference values, 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, k5、k7Indicate proportionality coefficient, k6、k8
Indicate 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 values of inner ring current controller output, eq_refIndicate the output of inner ring current controller
Q shaft voltage reference values, idIndicate the d axis actual currents of Outer Loop Power Controller output, iqIndicate Outer Loop Power Controller output
Q axis actual currents, k9、k11Indicate proportionality coefficient, k10、k12Indicate 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 v, three-phase virtual video gesture and three-phase loop current suppression voltage increment, and as the following formula
Determine the modulation wave voltage of mixed type module multilevel converter：
Wherein, upj_refIndicate the modulation wave voltage of upper bridge arm in mixed type module multilevel converter, unj_refIndicate mixing
The modulation wave voltage of lower bridge arm, e in type modularization multi-level converterj_refIndicate three-phase virtual video gesture, ucirj_refIndicate three
Phase circulation inhibits voltage increment.
6. a kind of mixed type module multilevel converter lightness device, which is characterized in that including：
Harmonic oscillator, for when mixed type module multilevel converter is stablized, determining third harmonic voltage correction amount；
Change of current suppressor,ForThree-phase loop current suppression voltage is determined according to the bridge arm current of mixed type module multilevel converter
Correction amount；
First controller determines mixing mould for passing through third harmonic voltage correction amount and three-phase loop current suppression voltage increment
The modulation wave voltage of block multilevel converter；
Second controller, for reducing submodule capacitor voltage by the modulating wave voltage of mixed type module multilevel converter
Fluctuation.
7. mixed type module multilevel converter lightness device according to claim 6, which is characterized in that described humorous
Wave producer includes：
Judging unit, for judging whether mixed type module multilevel converter is stablized according to following constraintss, if meeting
Constraints, mixed type module multilevel converter are stablized：
Wherein, m indicates that the voltage modulated ratio of mixed type module multilevel converter, p indicate voltage modulated than the upper limit, andN2Indicate full-bridge submodule number, UcIndicate capacitance voltage reference value in submodule, UdcIndicate DC bus
Voltage, N indicate bridge arm submodule number.
8. mixed type module multilevel converter lightness device according to claim 6, which is characterized in that described humorous
Wave producer further includes：
Third harmonic voltage correction amount determination unit, for determining third harmonic voltage correction amount as the following formula：
Δ v=(1/2) [max (UA,UB,UC)+min(UA,UB,UC)]
Wherein, Δ v indicates third harmonic voltage correction amount, UA、UB、UCIndicate the three-phase of mixed type module multilevel converter
Alternating voltage reference value.
9. mixed type module multilevel converter lightness device according to claim 6, which is characterized in that described to change
Flowing suppressor includes：
Three-phase internal current determination unit, the bridge arm current for acquiring mixed type module multilevel converter, and under
Formula determines the three-phase internal current of mixed type module multilevel converter：
Wherein, icirjIndicate the three-phase internal current of mixed type module multilevel converter, j=a, b, c, ipjIndicate mixed type
The electric current of upper bridge arm, i in modularization multi-level converternjIndicate the electricity of lower bridge arm in mixed type module multilevel converter
Stream；
Abc/dq converter units are used for icirjAbc/dq transformation is carried out, obtains changing inside mixed type module multilevel converter
The d axis components and q axis components of stream；
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 components determine d axis loop current suppression voltage increments and q axis loop current suppression voltage increments as the following formula：
Wherein, ucird_refIndicate d axis loop current suppression voltage increments, ucirq_refIndicate q axis loop current suppression voltage increments, i2fd
Indicate the d shaft current components 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 values of mixed type module multilevel converter, i2fq_refIndicate mixed type
The q shaft current reference values of modularization multi-level converter, k1、k3Indicate proportionality coefficient, k2、k4Indicate that integral coefficient, ω indicate angle
Frequency, LarmIndicate bridge arm inductance；
First dq/abc converter units are used for ucird_refAnd ucirq_refDq/abc transformation is carried out, three-phase loop current suppression electricity is obtained
Press correction amount.
10. mixed type module multilevel converter lightness device according to claim 6, which is characterized in that described
First controller includes：
Current reference value determination unit, the current reference value for determining Outer Loop Power Controller output as the following formula：
Wherein, id_refIndicate the d shaft current reference values of Outer Loop Power Controller output, iq_refIndicate Outer Loop Power Controller output
Q shaft current reference values, 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, k5、k7Indicate proportionality coefficient, k6、k8
Indicate 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 values of inner ring current controller output, eq_refIndicate the output of inner ring current controller
Q shaft voltage reference values, idIndicate the d axis actual currents of Outer Loop Power Controller output, iqIndicate Outer Loop Power Controller output
Q axis actual currents, k9、k11Indicate proportionality coefficient, k10、k12Indicate integral coefficient；
2nd dq/abc converter units are 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 v, three-phase virtual video gesture and three phase circulations
Inhibit voltage increment, and determines the modulation wave voltage of mixed type module multilevel converter as the following formula：
Wherein, upj_refIndicate the modulation wave voltage of upper bridge arm in mixed type module multilevel converter, unj_refIndicate mixing
The modulation wave voltage of lower bridge arm, e in type modularization multi-level converterj_refIndicate three-phase virtual video gesture, ucirj_refIndicate three
Phase circulation inhibits voltage increment.
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