CN106941315A - A kind of Modular multilevel converter MMC precharge control methods and its control device - Google Patents
A kind of Modular multilevel converter MMC precharge control methods and its control device Download PDFInfo
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- CN106941315A CN106941315A CN201611096482.0A CN201611096482A CN106941315A CN 106941315 A CN106941315 A CN 106941315A CN 201611096482 A CN201611096482 A CN 201611096482A CN 106941315 A CN106941315 A CN 106941315A
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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
- H02M1/36—Means for starting or stopping converters
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Abstract
The present invention provides a kind of Modular multilevel converter MMC precharge control methods and its control device, including：Uncontrollable charging is carried out to Modular multilevel converter MMC systems, submodule capacitances in series voltage on charge circuit is charged to the charging voltage of AC system offer；It is determined that the capacitance voltage of each facies unit upper and lower bridge arm electric current and submodule；The direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；As submodule capacitor voltage uciReach after steady-state voltage reference voltage, cut off submodule, and unlock next submodule progress aforesaid operations；When proceeding to last submodule charging complete of bridge arm one by one, the marking signal of bridge arm charging complete is returned；The submodule electric capacity of all bridge arms is charged into steady-state voltage successively, start-up course is completed.This method is simple, and is easy to expand to different level numbers, can be on the basis of uncontrollable charging by all submodule capacitor voltage rapid uplifts to voltage level needed for converter steady-state operation.
Description
Technical field
The present invention relates to Power System Flexible direct current transmission and distribution and electric and electronic technical field, and in particular to a kind of modularization
Multi-level converter MMC precharge control methods and its control device.
Background technology
Modular multilevel converter since its birth just due to its control flexibly, sub-modular structure be easy to expand etc. it is excellent
Point receives the extensive concern of domestic and international researcher.Require that system possesses certain initial voltage, but MMC during its steady-state operation
It is different from traditional two level converter, because comprising the submodule electric capacity largely suspended, initial time, all submodule electric capacity are equal
Without initial voltage；, it is necessary to take corresponding control strategy first to enter to sub- module capacitance before stable operation working condition is entered
Row charging, steady-state voltage is charged to by submodule electric capacity.MMC precharge start-up course is the base of systematic steady state operation
Plinth, further lifting preliminary filling electrical property has highly important meaning.
At present, it is pre-charged existing following publication in control strategy for Modular multilevel converter：
[1] Xiao shakes celebrating, and Xu Zheng, Xue Yinglin wait startup control strategy [J] high voltages of Multi-end flexible direct current transmission systems
Technology, 2014,40 (8):2550-2557.
[2] Kong Ming, Qiu Yufeng, He Zhiyuan, wait the preliminary filling electric control of modular multilevel formula flexible direct-current transmission converters
Tactful [J] electric power network techniques, 2011,35 (11):67-73.
[3] Lee visits, and Zhao Chengyong, imperial court is bright, and the MMC-HVDC system converter stations that waiting is used for power grid"black-start" start strategy
[J] Automation of Electric Systems, 2013,37 (9):117-122.
[4] Chinese-language, Zhao Xiaoming, Huang Xiaoming wait startup strategy [J] electricity of modular multi-level flexible direct-current transmission systems
Force system is automated, 2015,39 (11):51-58.
Mention and being charged using separate excitation mode in document [1], this method refers to using extra auxiliary charging power supply to conversion
Device submodule electric capacity is charged, although control method is simple, but is due to the specified electricity in practical engineering application Neutron module
Pressure may be up to more than thousands of volts, to be realized such high-tension dc source and be the tens of up to a hundred submodule electricity of converter
Hold and complete charging, financial cost is higher.Document [2,3] is literary using slop control is incorporated into MMC controllable preliminary filling electric control
Offer [4] the then influence of the different earthing modes of selective analysis converter to start-up course.Above-mentioned document is to controllable pre-charge process
Control carried out on the premise of charging current limiter resistance is bypassed, current-limiting resistance is used as limitation MMC to start charging current
Critical component, is essential in MMC start-up courses, its current limliting is then limited in controllable pre-charging stage bypass current-limiting resistance
Ability.
At present, existing module multi-level converter precharge control strategy or financial cost are higher, or need to be controllable pre-
Charging stage bypasses current-limiting resistance.
The content of the invention
To solve above-mentioned deficiency of the prior art, it is an object of the invention to provide a kind of Modular multilevel converter
MMC precharge control methods and its control device, this method are put into system in controllable pre-charging stage holding current-limiting resistance and filled
In electrical circuit, limitation capability of the current-limiting resistance to charging current is taken full advantage of, by submodule capacitor voltage fast lifting to steady
State runtime value, effectively reduction converter from pre-charge process switch to normal operation when voltage fluctuation of capacitor.
The purpose of the present invention is realized using following technical proposals：
The present invention provides a kind of Modular multilevel converter MMC precharge control methods, and the modular multilevel becomes
Parallel operation MMC is made up of three converter facies units, and each facies unit includes two bridge arms up and down, and each bridge arm is by N number of semi-bridge type
Submodule, a bridge arm inductance LarmAnd current-limiting resistance RlimIn series, it is theed improvement is that, the control method bag
Include following step：
A1 uncontrollable charging) is carried out to Modular multilevel converter MMC systems, by submodule electric capacity string on charge circuit
Connection voltage Ucs charges to the charging voltage of AC system offer；
A2 the capacitance voltage of each facies unit upper and lower bridge arm electric current and submodule) is determined；
A3) the direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；
A4) as submodule capacitor voltage uciReach steady-state voltage reference voltage UcrefAfterwards, submodule is cut off, and is unlocked
Next submodule, repeats step A2)~A4)；
When A5) proceeding to last submodule charging complete of bridge arm one by one, the marking signal of bridge arm charging complete is returned；
A6 the submodule electric capacity of all bridge arms) is charged into steady-state voltage U successivelycref, pre-charge process completion.
Further, the step A1) in, gather submodule electric capacity on each phase bridge arm respectively using voltage hall sensor
Series voltage UcsCharging and AC system line voltage Ulabc, line voltage amplitude U is obtained by Fourier analysisLL, when each phase bridge arm
Upper submodule capacitances in series voltage UcsEqual to ULLWhen uncontrollable charging complete, into the controllable charging stage.
Further, the step A2) in, all submodules are bypassed, each phase is gathered respectively using current Hall sensor
Upper bridge arm current ipiWith lower bridge arm current ini；Utilize voltage hall sensor collection submodule capacitor voltage uci, wherein, i takes 1
To N, N is bridge arm submodule number.
Further, the step A3) in, if upper bridge arm current ipi>0 or lower bridge arm current ini>0, if so, then putting into
I-th of submodule, and the electric capacity of i-th of submodule is charged；Otherwise, i-th of submodule is cut off.
Further, in the step A5, the marking signal is：Whether the submodule number for having completed charging is equal to conversion
The submodule number N that device bridge arm is included；If reaching marking signal, step A6 is carried out)；Otherwise return to step A2).
The present invention also provides a kind of Modular multilevel converter MMC preliminary filling controller for electric consumption, and it is theed improvement is that, institute
Stating control device includes：
Charging module：, will be sub on charge circuit for carrying out uncontrollable charging to Modular multilevel converter MMC systems
Module capacitance series voltage Ucs charges to the charging voltage of AC system offer；
Determining module：Capacitance voltage for determining each facies unit upper and lower bridge arm electric current and submodule；
Judge module：For the direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；
Unlocked state：As submodule capacitor voltage uciReach steady-state voltage reference voltage UcrefAfterwards, for cutting off son
Module, and next submodule is unlocked, repeat step A2)~A4)；
Return to module：When proceeding to last submodule charging complete of bridge arm one by one, for returning to bridge arm charging complete
Marking signal；
Complement mark module：For determining that the submodule electric capacity by all bridge arms charges to steady-state voltage successively
Ucref, mark pre-charge process completion.
Further, the charging module is additionally operable to：Gather submodule on each phase bridge arm respectively using voltage hall sensor
Block capacitances in series voltage UcsCharging and AC system line voltage Ulabc, line voltage amplitude U is obtained by Fourier analysisLL, when each
Submodule capacitances in series voltage U on phase bridge armcsEqual to ULLWhen uncontrollable charging complete, into the controllable charging stage.
Further, the determining module is additionally operable to：All submodules are bypassed, are gathered respectively using current Hall sensor
Bridge arm current i in each phasepiWith lower bridge arm current ini；Utilize voltage hall sensor collection submodule capacitor voltage uci, wherein, i
1 is taken to arrive N, N is bridge arm submodule number.
Further, the judge module is additionally operable to：If upper bridge arm current ipi>0 or lower bridge arm current ini>0, if so, then
I-th of submodule is put into, and the electric capacity of i-th of submodule is charged；Otherwise, i-th of submodule is cut off.
Further, the marking signal of the complement mark module is：Whether the submodule number for having completed charging is equal to change
The submodule number N that parallel operation bridge arm is included.
There is a basic understanding for some aspects of the embodiment to disclosure, shown below is simple summary.Should
Summarized section is not extensive overview, nor to determine key/critical component or describe the protection domain of these embodiments.
Its sole purpose is that some concepts are presented with simple form, in this, as the preamble of following detailed description.
Compared with immediate prior art, the excellent effect that the technical scheme that the present invention is provided has is：
The present invention provides a kind of simple and effective controllable unblock control strategy, and the strategy keeps limiting in controllable pre-charging stage
Leakage resistance is put into system charge circuit, takes full advantage of limitation capability of the current-limiting resistance to charging current, by submodule electricity
Hold voltage fast lifting to steady-state operation value, effectively reduction converter from pre-charge process switch to normal operation when capacitance voltage
Fluctuation.
The control method is simple, can make full use of the current limiting capacity of current-limiting resistance, submodule capacitor voltage is quickly carried
The capacitance voltage of converter steady-state operation needs is risen to, while special pre-charge controller need not be designed, and can effectively be dropped
The fluctuation of submodule capacitor voltage when low converter switchs to normal course of operation by pre-charge process, reduction is rushed to capacitor
Hit, extend the service life of capacitor.
For above-mentioned and related purpose, one or more embodiments include will be explained in below and in claim
In the feature that particularly points out.Following explanation and accompanying drawing describe some illustrative aspects in detail, and its indicate be only
Some modes in the utilizable various modes of principle of each embodiment.Other benefits and novel features will be under
The detailed description in face is considered in conjunction with the accompanying and becomes obvious, the disclosed embodiments be will include all these aspects and they
Be equal.
Brief description of the drawings
Fig. 1 is that controllable precharge unlocks flow chart；
Fig. 2 is MMC back-to-back system (CCC-0) structure charts；
(converter facies unit includes two bridge arms up and down in figure, and each bridge arm is by N number of semi-bridge type submodule (sub-
Modules, SM) and a bridge arm inductance Larm and current-limiting resistance Rlim be in series)；
Fig. 3 be MMC be pre-charged start-up course simulation result figure, wherein (a) for precharge when MMC1 and MMC2 in a facies units
Upper bridge arm submodule capacitor voltage waveform, (b) is converter AC charging current waveform in pre-charge process；
Fig. 4 becomes a full member for precharge often runs contrast simulation result figure, and (a) is to be introduced directly into two close cycles after uncontrollable charging
Control method MMC1, (b) be introduced directly into after uncontrollable charging two close cycles control method MMC2 submodule electric capacity
Voltage waveform, (c) is the MMC1 submodule capacitor voltage waveforms using this method, and (d) is the MMC2 submodules using this method
Capacitance voltage waveform.
Embodiment
The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings.
The following description and drawings fully show specific embodiments of the present invention, to enable those skilled in the art to
Put into practice them.Other embodiments can include structure, logic, electric, process and other changes.Embodiment
Only represent possible change.Unless explicitly requested, otherwise single component and function are optional, and the order operated can be with
Change.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.This hair
The scope of bright embodiment includes the gamut of claims, and claims is all obtainable equivalent
Thing.Herein, these embodiments of the invention can individually or generally be represented that this is only with term " invention "
For convenience, and if in fact disclosing the invention more than one, it is not meant to automatically limit the scope of the application to appoint
What single invention or inventive concept.
The present invention provides a kind of Modular multilevel converter MMC precharge control methods, and the modular multilevel becomes
Parallel operation MMC is made up of three converter facies units, and each facies unit includes two bridge arms up and down, and each bridge arm is by N number of semi-bridge type
Submodule, a bridge arm inductance LarmAnd current-limiting resistance RlimIn series, control method comprises the steps：
A1 uncontrollable charging) is carried out to Modular multilevel converter MMC systems, by submodule electric capacity string on charge circuit
Connection voltage Ucs charges to the charging voltage of AC system offer；
A2 the capacitance voltage of each facies unit upper and lower bridge arm electric current and submodule) is determined；
A3) the direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；
A4) as submodule capacitor voltage uciReach steady-state voltage reference voltage UcrefAfterwards, submodule is cut off, and is unlocked
Next submodule repeats step A2~A4；
When A5) proceeding to last submodule charging complete of bridge arm one by one, the marking signal of bridge arm charging complete is returned
[whether the submodule number for having completed charging is equal to the submodule number N that converter bridge arm is included]；
A6 the submodule electric capacity of all bridge arms) is charged into steady-state voltage U successivelycref, start-up course completion.
Specifically：
Step A1) in, gather submodule capacitances in series voltage U on each phase bridge arm respectively using voltage hall sensorcsFill
Electricity and AC system line voltage Ulabc, line voltage amplitude U is obtained by Fourier analysisLL, work as UcsEqual to ULLWhen uncontrollable charging
Complete, into the controllable charging stage.
Step A2) in, all submodules are bypassed, bridge arm current i in each phase is gathered respectively using voltage hall sensorpi、
Lower bridge arm current iniWith submodule capacitor voltage uci, wherein, i takes 1 to arrive N, and N is bridge arm submodule number.
Step A3) in, if upper bridge arm current ipi>0 or small bridge arm current ini>0, if so, i-th of submodule is then put into, and
The electric capacity of i-th of submodule is charged, i-th of submodule is otherwise cut off；
Step A5) in, the marking signal is：Whether the submodule number for having completed charging is equal to what converter bridge arm was included
Submodule number N；If reaching marking signal, step A6 is carried out)；Otherwise return to step A2).
The present invention also provides a kind of Modular multilevel converter MMC preliminary filling controller for electric consumption, including：
Charging module：, will be sub on charge circuit for carrying out uncontrollable charging to Modular multilevel converter MMC systems
Module capacitance series voltage Ucs charges to the charging voltage of AC system offer；
Determining module：Capacitance voltage for determining each facies unit upper and lower bridge arm electric current and submodule；
Judge module：For the direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；
Unlocked state：As submodule capacitor voltage uciReach steady-state voltage reference voltage UcrefAfterwards, for cutting off son
Module, and next submodule is unlocked, repeat step A2)~A4)；
Return to module：When proceeding to last submodule charging complete of bridge arm one by one, for returning to bridge arm charging complete
Marking signal；
Complement mark module：For determining that the submodule electric capacity by all bridge arms charges to steady-state voltage successively
Ucref, mark pre-charge process completion.
It is preferred that, the charging module is additionally operable to：Gather submodule on each phase bridge arm respectively using voltage hall sensor
Capacitances in series voltage UcsCharging and AC system line voltage Ulabc, line voltage amplitude U is obtained by Fourier analysisLL, Dang Gexiang
Submodule capacitances in series voltage U on bridge armcsEqual to ULLWhen uncontrollable charging complete, into the controllable charging stage.
It is preferred that the determining module be additionally operable to：All submodules are bypassed, are gathered respectively respectively using current Hall sensor
Bridge arm current i in phasepiWith lower bridge arm current ini；Utilize voltage hall sensor collection submodule capacitor voltage uci, wherein, i takes
1 arrives N, and N is bridge arm submodule number.
It is preferred that, the judge module is additionally operable to：If upper bridge arm current ipi>0 or lower bridge arm current ini>0, if so, then throwing
Enter i-th of submodule, and the electric capacity of i-th of submodule is charged；Otherwise, i-th of submodule is cut off.
It is preferred that, the marking signal of the complement mark module is：Whether the submodule number for having completed charging is equal to conversion
The submodule number N that device bridge arm is included.
Embodiment
Flow diagram is unlocked as shown in Figure 1, changes the solution lock control that parameter N is the converter for being suitable for varying level number
System, the different level number quite convenient for extending to, and carry it is tactful need not design special controller can be by all submodules
The voltage that electric capacity is charged to needed for steady-state operation, enormously simplify MMC startup control.
Simulation parameter sets as follows：Converter AC phase voltage amplitude Upm=20kV, submodule number N=10, current limliting electricity
Hinder Rlim=20 Ω, bridge arm inductance Larm=4mH, submodule electric capacity C=6000 μ F, submodule electric capacity reference voltage Ucref=4kV,
Emulation uses converter MMC2 ACs in back-to-back system (CCC-0) shown in Fig. 2, simulation process to be disconnected with AC system 2.
Bridge arm submodule capacitor voltage waveform on a facies units in MMC1 and MMC2 when Fig. 3 (a) is precharge.Fig. 3 (b) is
Converter AC charging current waveform in pre-charge process.Represent uncontrollable precharge in figure before and after dotted line respectively and controllable pre-
Charge two startup stages.From Fig. 3 (a) (b), in uncontrollable pre-charging stage, submodule capacitor voltage waveform from zero by
Steady-state value is gradually risen to, in the presence of current-limiting resistance, charging starting stage maximum charging current is about 1kA.By dotted line in figure
Later simulation waveform can be seen that in controllable pre-charging stage, and it is steady that bridge arm Neutron module capacitance voltage is raised to its one by one
State reference value 4kV, is bypassed afterwards, and capacitance voltage keeps constant.As shown in Fig. 3 (b) chain lines, due in now system
All submodule electric capacity have been provided with certain DC voltage, charging current maximum and when starting not less than uncontrollable charging process
The current peak at quarter, therefore, using the unblock control strategy of the present invention, does not interfere with the configuration of current-limiting resistance.
Fig. 4 (a) (b) represents to be introduced directly into MM1 and above and below the MMC2 bridge of the control method of two close cycles after uncontrollable charging
Arm submodule capacitor voltage waveform, (c) (d) represents MM1 the and MMC2 upper and lower bridge arm submodule capacitor voltage ripples using this method
Shape.The simulation result for contrasting two kinds of control strategies is understood, if directly using double-closed-loop control, is become a full member often by being pre-charged in converter
During operation, larger fluctuation occurs in submodule capacitor voltage, and excessive voltage pulsation can increase the impact to sub- module capacitance, contracting
Short capacitor service life；And under unblock policy control of the present invention, due to submodule capacitor voltage quilt in advance
Steady-state voltage is charged to, submodule capacitor voltage fluctuation amplitude significantly drops when converter goes to normal operation by being pre-charged
Low, the handoff procedure of working condition is more smooth, and the impact that capacitor is caused is obviously reduced for voltage pulsation, is conducive to extension
The service life of module capacitors.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than its limitations, although with reference to above-described embodiment pair
The present invention is described in detail, and those of ordinary skill in the art can still enter to the embodiment of the present invention
Row modification or equivalent, these any modifications or equivalent without departing from spirit and scope of the invention, in application
Within pending claims of the invention.
Claims (10)
1. a kind of Modular multilevel converter MMC precharge control methods, the Modular multilevel converter MMC is by three
Converter facies unit constitute, each facies unit include up and down two bridge arms, each bridge arm by N number of semi-bridge type submodule, one
Bridge arm inductance LarmAnd current-limiting resistance RlimIt is in series, it is characterised in that the control method comprises the steps：
A1 uncontrollable charging) is carried out to Modular multilevel converter MMC systems, by submodule capacitances in series electricity on charge circuit
Press UCSThe charging voltage of AC system offer is provided；
A2 the capacitance voltage of each facies unit upper and lower bridge arm electric current and submodule) is determined；
A3) the direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；
A4) as submodule capacitor voltage uciReach steady-state voltage reference voltage UcrefAfterwards, submodule is cut off, and is unlocked next
Individual submodule, repeats step A2)~A4)；
When A5) proceeding to last submodule charging complete of bridge arm one by one, the marking signal of bridge arm charging complete is returned；
A6 the submodule electric capacity of all bridge arms) is charged into steady-state voltage U successivelycref, pre-charge process completion.
2. Modular multilevel converter precharge control method as claimed in claim 1, it is characterised in that the step
A1 in), submodule capacitances in series voltage U on each phase bridge arm is gathered respectively using voltage hall sensorcsCharging and AC system
Line voltage Ulabc, line voltage amplitude U is obtained by Fourier analysisLL, as submodule capacitances in series voltage U on each phase bridge armcsDeng
In ULLWhen uncontrollable charging complete, into the controllable charging stage.
3. Modular multilevel converter precharge control method as claimed in claim 1, it is characterised in that the step
A2 in), all submodules is bypassed, bridge arm current i in each phase is gathered respectively using current Hall sensorpiWith lower bridge arm current
ini；Utilize voltage hall sensor collection submodule capacitor voltage uci, wherein, i takes 1 to arrive N, and N is bridge arm submodule number.
4. Modular multilevel converter precharge control method as claimed in claim 1, it is characterised in that the step
A3 in), if upper bridge arm current ipi>0 or lower bridge arm current ini>0, if so, i-th of submodule is then put into, and to i-th of submodule
The electric capacity of block is charged；Otherwise, i-th of submodule is cut off.
5. Modular multilevel converter precharge control method as claimed in claim 1, it is characterised in that the step A5
In, the marking signal is：Whether the submodule number for having completed charging is equal to the submodule number N that converter bridge arm is included；If reaching
To marking signal, then step A6 is carried out)；Otherwise return to step A2).
6. a kind of Modular multilevel converter MMC preliminary filling controller for electric consumption, it is characterised in that the control device includes：
Charging module：For carrying out uncontrollable charging to Modular multilevel converter MMC systems, by submodule on charge circuit
Capacitances in series voltage UCSThe charging voltage of AC system offer is provided；
Determining module：Capacitance voltage for determining each facies unit upper and lower bridge arm electric current and submodule；
Judge module：For the direction of bridge arm current where judging submodule, and judge whether bridge arm current is more than 0；
Unlocked state：As submodule capacitor voltage uciReach steady-state voltage reference voltage UcrefAfterwards, for cutting off submodule,
And next submodule is unlocked, and repeat step A2)~A4)；
Return to module：When proceeding to last submodule charging complete of bridge arm one by one, the mark for returning to bridge arm charging complete
Will signal；
Complement mark module：For determining that the submodule electric capacity by all bridge arms charges to steady-state voltage U successivelycref, mark
Pre-charge process is completed.
7. Modular multilevel converter MMC preliminary filling controller for electric consumption as claimed in claim 6, it is characterised in that described to fill
Electric module is additionally operable to：Gather submodule capacitances in series voltage U on each phase bridge arm respectively using voltage hall sensorcsCharging and friendship
Streaming system line voltage Ulabc, line voltage amplitude U is obtained by Fourier analysisLL, when submodule capacitances in series electricity on each phase bridge arm
Press UcsEqual to ULLWhen uncontrollable charging complete, into the controllable charging stage.
8. Modular multilevel converter MMC preliminary filling controller for electric consumption as claimed in claim 6, it is characterised in that described true
Cover half block is additionally operable to：All submodules are bypassed, bridge arm current i in each phase is gathered respectively using current Hall sensorpiWith lower bridge
Arm electric current ini；Utilize voltage hall sensor collection submodule capacitor voltage uci, wherein, i takes 1 to arrive N, and N is bridge arm submodule
Number.
9. Modular multilevel converter MMC preliminary filling controller for electric consumption as claimed in claim 6, it is characterised in that described to sentence
Disconnected module is additionally operable to：If upper bridge arm current ipi>0 or lower bridge arm current ini>0, if so, i-th of submodule is then put into, and to i-th
The electric capacity of individual submodule is charged；Otherwise, i-th of submodule is cut off.
10. Modular multilevel converter MMC preliminary filling controller for electric consumption as claimed in claim 6, it is characterised in that described complete
Marking signal into Sign module is：Whether the submodule number for having completed charging is equal to the submodule number N that converter bridge arm is included.
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Cited By (7)
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| CN108933543A (en) * | 2018-09-04 | 2018-12-04 | 兰州理工大学 | The precharge control method of inverter in a kind of back-to-back MMC structure |
| CN109861266A (en) * | 2019-01-15 | 2019-06-07 | 南京工程学院 | The flexible starting method of the flexible HVDC transmission system of the access containing extensive new energy |
| CN109950940A (en) * | 2017-12-20 | 2019-06-28 | 广州供电局有限公司 | Valve group charging unit and valve group charge control method |
| CN112165245A (en) * | 2020-07-31 | 2021-01-01 | 国电南瑞科技股份有限公司 | MMC converter starting method and system |
| CN115622383A (en) * | 2022-12-20 | 2023-01-17 | 国网经济技术研究院有限公司 | High-voltage direct-current transformer pre-charging circuit and method for direct-current boosting and collecting |
| CN117040082A (en) * | 2023-10-08 | 2023-11-10 | 国网江苏省电力有限公司电力科学研究院 | M3C converter bridge arm non-invasive precharge method, device, equipment and medium |
| CN117155105A (en) * | 2023-11-01 | 2023-12-01 | 国网浙江省电力有限公司电力科学研究院 | Method and system for controlling starting of direct-current transformer of full direct-current system |
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| CN115622383A (en) * | 2022-12-20 | 2023-01-17 | 国网经济技术研究院有限公司 | High-voltage direct-current transformer pre-charging circuit and method for direct-current boosting and collecting |
| CN117040082A (en) * | 2023-10-08 | 2023-11-10 | 国网江苏省电力有限公司电力科学研究院 | M3C converter bridge arm non-invasive precharge method, device, equipment and medium |
| CN117040082B (en) * | 2023-10-08 | 2024-01-05 | 国网江苏省电力有限公司电力科学研究院 | M3C converter bridge arm non-invasive precharge method, device, equipment and medium |
| CN117155105A (en) * | 2023-11-01 | 2023-12-01 | 国网浙江省电力有限公司电力科学研究院 | Method and system for controlling starting of direct-current transformer of full direct-current system |
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