CN107317472A - A kind of full-bridge starts method with half-bridge mixed type module multilevel converter - Google Patents
A kind of full-bridge starts method with half-bridge mixed type module multilevel converter Download PDFInfo
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- CN107317472A CN107317472A CN201710527878.4A CN201710527878A CN107317472A CN 107317472 A CN107317472 A CN 107317472A CN 201710527878 A CN201710527878 A CN 201710527878A CN 107317472 A CN107317472 A CN 107317472A
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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 discloses a kind of full-bridge and starts method with half-bridge mixed type module multilevel converter, transverter is exchanged first does not control charging, when transverter each submodule voltage reach take can loop works threshold value after, make the consistent with half-bridge submodule to external characteristics of full-bridge submodule by triggering the IGBT of full-bridge submodule, system carries out secondary not controlling charging by starting resistance to all submodules；It is secondary not control after charging complete, make full-bridge and half-bridge submodule electric voltage equalization by valve control Pressure and Control；Finally start DC voltage control, complete transverter and start；It can solve because charge characteristic differs and causes the inconsistent situation of charging voltage between different submodules between different submodules; reduction hybrid type modular multilevel, which is not controlled, directly unlocks brought rush of current after charging, it is to avoid start failure and protection blocking caused by different submodule capacitor voltages are uneven.
Description
Technical field
The present invention relates to flexible direct-current transmission field, and in particular to a kind of full-bridge is changed with many level of half-bridge mixed type moduleization
Flow device and start method.
Background technology
Modularization multi-level converter (MMC) is to develop a kind of more rapid flexible DC power transmission topology in the world at present
Structure, at present, modular multilevel structure used is generally semi-bridge type in engineering, and it is relatively fewer because of switching device used, damages
Consumption it is small, the low advantage of cost is widely used, but its can not isolated DC failure, be not suitable for long range overhead transmission line, reduce
The operational reliability and the scope of application of flexible direct current power transmission system.
Bridge-type submodule possesses the ability of DC Line Fault isolation, but its switching device is more than half-bridge submodule, and loss is big,
Cost is high, adds the construction cost of system, reduces system operation income.
Modularization multi-level converter based on full-bridge and half-bridge submodule mixed type is straight possessing compared to full bridge structure
On the basis of the ability for flowing Fault Isolation, cost and loss are reduced, with good technical prospect.
But full-bridge and half-bridge mixed type transverter exchange do not control charge initiation when, the submodule of its different structure it is external
Characteristic is not quite identical, will cause in the case where parameter designing is consistent, and the charging voltage of full-bridge and half-bridge is inconsistent；If in son
Transverter is directly unlocked after module is powered, larger rush of current will be produced, in order to right during reducing submodule charging and starting
The impact of power network and primary equipment, a kind of rationally effective modular multi-level flexible direct-current transmission converter startup method is must
Indispensable.
The full-bridge of Chinese patent application 201510600148.3 and the modularization multi-level converter of half-bridge submodule series-parallel connection are opened
Dynamic method, introduces a kind of full-bridge and the modularization multi-level converter and startup method of half-bridge submodule series-parallel connection, its institute
The hybrid type transverter submodule parameter designing of introduction is inconsistent, and the capacitance of full-bridge submodule is set to half-bridge submodule electric capacity
Two times of value, suppress to exchange do not control that charging stage full-bridge and half-bridge submodule charge inconsistent with this.But this can be caused entirely
Bridge submodule capacitance is excessive, the manufacturing cost of submodule and the construction cost of system is significantly increased, in the fortune of high-power
In the case of row, existing submodule capacitor manufacturing process can not even produce and meet the capacitor that full-bridge submodule is used,
The patent, which only takes into account, simultaneously suppresses the inconsistent of different submodule charging voltages when charging is not controlled in exchange, but its design side used
Method occurs that half-bridge submodule voltage is two times of full-bridge submodule voltage when transverter is charged by DC side, and this is in engineering
In be worthless.
The content of the invention
To solve the deficiency that prior art is present, the invention discloses a kind of full-bridge and many level of half-bridge mixed type moduleization
Transverter starts method, and charging process is not controlled to solve full-bridge and half-bridge mixed type module multilevel converter in AC
The inconsistent situation of middle different submodule charging voltages；Ensure voltage uniformity of the submodule in start-up course, it is to avoid different
Start failure and protection blocking caused by submodule capacitor voltage is uneven.
To achieve the above object, the present invention uses following technical scheme：
A kind of full-bridge starts method, full-bridge and half-bridge mixed type module with half-bridge mixed type module multilevel converter
Multilevel converter includes three facies units, and each facies unit includes bridge arm and lower bridge arm in structure identical, and each bridge arm has A
Individual full-bridge submodule, B half-bridge submodule and bridge arm reactor composition；
Wherein, the rated direct voltage and submodule electric capacity all same of full-bridge submodule and half-bridge submodule；
The number A of full-bridge submodule, which is more than or equal to, meets full-bridge needed for isolated DC failure under DC bipolar short trouble
The minimum value of number of modules, according to different system and major loop parameter, the ratio of full-bridge submodule number and half-bridge submodule number is not
Together；
Multilevel converter starts method and comprised the following steps：
A, the AC circuit breaker for closing transverter AC, power supply, which is not controlled to the submodule of transverter by starting resistance, to be filled
Electricity, now the full-bridge submodule charging voltage of transverter is about 2 times of half-bridge submodule charging voltage；
B, when transverter each submodule voltage reach take can loop works threshold value after, each submodule is built with valve control system
Vertical communication, by triggering the IGBT of full-bridge submodule, makes the consistent with half-bridge submodule to external characteristics of full-bridge submodule, system is led to
Cross and start resistance all submodule is carried out secondary not control charging；
C, detection DC voltage, when DC voltage reaches setting value, bypass the startup resistance of current conversion station；
Submodule in D, unblock current conversion station, control excision bridge arm, remaining submodule keeps original locking not put into state；
Charged by way of gradually increasing submodule and cutting off quantity to submodule, and put into submodule Pressure and Control, when excision quantity
When reaching preset value, submodule excision quantity is not further added by, until full-bridge and half-bridge voltage reach unanimously；
E, current conversion station start DC voltage control, until DC voltage and all submodules charge to rated voltage, charge
Complete.
Further, the step D Neutron module Pressure and Control are：When bridge arm current direction is submodule charging direction,
Cut off the maximum N number of submodule of voltage in all submodules；When bridge arm current direction is submodule course of discharge, excision is all
The minimum N number of submodule of voltage in submodule, wherein N is the excision submodule number that sets, by main loop parameter, full-bridge with
The ratio of half-bridge and the submodule charging voltage maximum constraint of permission.
Further, current conversion station is by the DC voltage control with slop control in the step E, until DC voltage and institute
There is submodule to charge to rated voltage.
Further, in the step B, by being triggered to full-bridge submodule, make full-bridge submodule to external characteristics with
Half-bridge submodule in bridge arm is consistent, by change full-bridge submodule to external characteristics, make system by starting resistance to all
Submodule carry out secondary not controlling charging.
Further, when initially not controlling charging, the voltage of full-bridge submodule is two times of half-bridge submodule voltage.
The full-bridge of the present invention starts method with half-bridge mixed type module multilevel converter, when each submodule of transverter
Voltage reach takes can after loop works threshold value, by trigger the IGBT of full-bridge submodule make full-bridge submodule to external characteristics with
Half-bridge submodule is consistent, and system carries out secondary not controlling charging by starting resistance to all submodules；It can solve because of different sons
Intermodule charge characteristic, which differs, causes the inconsistent situation of charging voltage between different submodules, reduces hybrid type modular multilevel
Do not control and brought rush of current is directly unlocked after charging, it is to avoid start failure caused by different submodule capacitor voltages are uneven
And protection blocking.
Brief description of the drawings
Fig. 1 is full-bridge and half-bridge mixed type module multilevel converter structure
Fig. 2 is semi-bridge type submodule (HBSM) topological structure
Fig. 3 is bridge-type submodule (FBSM) topological structure
Embodiment
With reference to embodiment, the invention will be described in further detail.Two kinds of situations of alternating current-direct current.
As Figure 1-3, the full-bridge of the embodiment of the present invention is changed with many level flexible DC power transmissions of half-bridge mixed type moduleization
Flowing device includes three facies units, and each facies unit includes bridge arm and lower bridge arm in structure identical, and each bridge arm has A full-bridge
Module (FBSM), B half-bridge submodule (HBSM) and bridge arm reactor composition；
The wherein rated direct voltage of full-bridge submodule and half-bridge submodule and submodule electric capacity all same；
The number of full-bridge submodule, which is more than or equal to, meets full-bridge needed for isolated DC failure under DC bipolar short trouble
The minimum value of number of modules, according to different system and major loop parameter, the ratio regular meeting of full-bridge submodule number and half-bridge submodule number
It is different.
Full-bridge of the present invention starts method, bag with many level flexible direct-current transmission converters of half-bridge mixed type moduleization
Include：
A, the AC circuit breaker for closing transverter AC, power supply, which is not controlled to the submodule of transverter by starting resistance, to be filled
Electricity, now the station full-bridge submodule charging voltage is about 2 times of half-bridge submodule charging voltage；
B, when transverter each submodule voltage reach take can loop works threshold value after, each submodule is built with valve control system
Vertical communication, now by triggering the IGBT of full-bridge submodule, makes the consistent with half-bridge submodule to external characteristics of full-bridge submodule, is
Unite and all submodule is carried out secondary not control charging by starting resistance；(now to all full-bridge submodules of transverter
IGBT4 trigger signals, keep IGBT4 closures, and system carries out secondary not controlling charging by starting resistance to all submodule).
C, detection DC voltage, when DC voltage reaches setting value, bypass the startup resistance of current conversion station；
Submodule in D, unblock current conversion station, control excision bridge arm, remaining submodule keeps original locking not put into state；
Charged by way of gradually increasing submodule and cutting off quantity to submodule, and put into submodule Pressure and Control, because of charge circuit
In submodule quantity reduce, the charging voltage of submodule will become big with the increase of excision quantity, when excision quantity reaches
During preset value, submodule excision quantity is not further added by, by the Pressure and Control of submodule, until full-bridge and half-bridge voltage reach one
Cause；
The pressure equalizing control method of the submodule is：When bridge arm current direction is submodule charging direction, excision is all
The maximum N number of submodule of voltage in submodule, wherein N is the excision submodule number set；When bridge arm current direction is submodule
During course of discharge, the minimum N number of submodule of voltage in all submodules is cut off, wherein N is the excision submodule number set.
Described setting excision submodule number N is by the ratio of main loop parameter, full-bridge and half-bridge and the submodule of permission
Block charging voltage maximum constraint；Because it is initial do not control charging when, the voltage of full-bridge submodule is two times of semi-bridge type, it is secondary not
After control charging, the voltage of bridge-type submodule is still higher than semi-bridge type submodule, if persistently reducing N, is likely to occur full-bridge submodule
Block voltage exceedes rated voltage, and semi-bridge type submodule is still below rated voltage, therefore can be by systematic parameter and the son of permission
Module charging voltage maximum limits N maximum.
E, current conversion station start the DC voltage control with slop control, until DC voltage and all submodules charge to volume
Determine voltage, charging complete.
Although the above-mentioned embodiment to the present invention is described, not to the limit of the scope of the present invention
System, the art personnel should be understood that on the basis of technical scheme those skilled in the art need not pay
Go out various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (5)
1. a kind of full-bridge starts method with half-bridge mixed type module multilevel converter, it is characterised in that：Full-bridge is mixed with half-bridge
Mould assembly modularization multi-level converter includes three facies units, and each facies unit includes bridge arm and lower bridge arm in structure identical,
Each bridge arm is made up of A full-bridge submodule, B half-bridge submodule and bridge arm reactor；
Wherein, the rated direct voltage and submodule electric capacity all same of full-bridge submodule and half-bridge submodule；
The number A of full-bridge submodule, which is more than or equal to, meets full-bridge submodule needed for isolated DC failure under DC bipolar short trouble
Several minimum values, according to different system and major loop parameter, the ratio of full-bridge submodule number and half-bridge submodule number is different；
Multilevel converter starts method and comprised the following steps：
A, the AC circuit breaker for closing transverter AC, power supply do not control charging by starting resistance to the submodule of transverter,
Now the full-bridge submodule charging voltage of transverter is about 2 times of half-bridge submodule charging voltage；
B, when transverter each submodule voltage reach take can loop works threshold value after, each submodule sets up logical with valve control system
News, by triggering the IGBT of full-bridge submodule, make the consistent with half-bridge submodule to external characteristics of full-bridge submodule, system is by opening
Dynamic resistance carries out secondary not controlling charging to all submodules；
C, detection DC voltage, when DC voltage reaches setting value, bypass the startup resistance of current conversion station；
Submodule in D, unblock current conversion station, control excision bridge arm, remaining submodule keeps original locking not put into state；Pass through
Gradually the mode of increase submodule excision quantity charges to submodule, and puts into submodule Pressure and Control, when excision quantity reaches
During preset value, submodule excision quantity is not further added by, until full-bridge and half-bridge voltage reach unanimously；
E, current conversion station start DC voltage control, until DC voltage and all submodules charge to rated voltage, charging complete.
2. full-bridge according to claim 1 starts method with half-bridge mixed type module multilevel converter, its feature exists
In：The step D Neutron module Pressure and Control are：When bridge arm current direction is submodule charging direction, all submodules are cut off
The maximum N number of submodule of voltage in block；When bridge arm current direction is submodule course of discharge, voltage in all submodules is cut off
Minimum N number of submodule, wherein N is the excision submodule number that sets, by main loop parameter, full-bridge and half-bridge ratio and
The submodule charging voltage maximum constraint of permission.
3. full-bridge according to claim 1 starts method with half-bridge mixed type module multilevel converter, its feature exists
In：Current conversion station is by the DC voltage control with slop control in the step E, until DC voltage and all submodules charge
To rated voltage.
4. full-bridge according to claim 1 starts method with half-bridge mixed type module multilevel converter, its feature exists
In：In the step B, by being triggered to full-bridge submodule, make full-bridge submodule to the half-bridge in external characteristics and bridge arm
Submodule is consistent, by change full-bridge submodule to external characteristics, system is carried out by starting resistance to all submodules
It is secondary not control charging.
5. full-bridge according to claim 1 starts method with half-bridge mixed type module multilevel converter, its feature exists
In：When initially not controlling charging, the voltage of full-bridge submodule is two times of half-bridge submodule voltage.
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| CN107834518A (en) * | 2017-11-08 | 2018-03-23 | 南京南瑞继保电气有限公司 | The recognition methods of one seed module dispersed placement |
| CN107947618A (en) * | 2017-12-12 | 2018-04-20 | 荣信汇科电气技术有限责任公司 | The controllable charging method of converter valve exchange side based on h-bridge mixed connection topology |
| CN108471251A (en) * | 2018-04-27 | 2018-08-31 | 广州供电局有限公司 | The startup method and device for the modularization multi-level converter that half-bridge is mixed with full-bridge |
| CN108631573A (en) * | 2018-04-24 | 2018-10-09 | 华北电力科学研究院有限责任公司 | The converter deblocking method and flexible direct current power transmission system of flexible direct current power transmission system |
| CN109546882A (en) * | 2018-11-14 | 2019-03-29 | 华北电力大学 | A kind of half full mixing MMC and its control method based on hybrid full-bridge |
| CN110383659A (en) * | 2018-02-23 | 2019-10-25 | Abb瑞士股份有限公司 | The energization of mixed current transformer including half-bridge submodule and full-bridge submodule |
| CN110739871A (en) * | 2019-09-23 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司广州局 | alternating current charging control strategy suitable for hybrid MMC under different working conditions |
| CN110798058A (en) * | 2018-08-03 | 2020-02-14 | 西安西电电力系统有限公司 | Starting method and device of hybrid modular multilevel converter |
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| CN111900887A (en) * | 2020-07-08 | 2020-11-06 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Flexible direct current converter valve charging method and control system |
| CN112134470A (en) * | 2020-08-07 | 2020-12-25 | 国网浙江省电力有限公司电力科学研究院 | Submodule proportion constraint determining method for realizing reliable charging of mixed MMC (Modular multilevel converter) |
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| CN107834518B (en) * | 2017-11-08 | 2020-01-10 | 南京南瑞继保电气有限公司 | Identification method for distributed arrangement of submodules |
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| US11349384B2 (en) | 2018-02-23 | 2022-05-31 | Hitachi Energy Switzerland Ag | Energization of a converter including a mix of half-bridge and full-bridge submodules |
| CN110383659A (en) * | 2018-02-23 | 2019-10-25 | Abb瑞士股份有限公司 | The energization of mixed current transformer including half-bridge submodule and full-bridge submodule |
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| CN111697851A (en) * | 2019-03-15 | 2020-09-22 | 南京南瑞继保电气有限公司 | Voltage maintaining method and device for submodule of modular multilevel converter |
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| CN110739871A (en) * | 2019-09-23 | 2020-01-31 | 中国南方电网有限责任公司超高压输电公司广州局 | alternating current charging control strategy suitable for hybrid MMC under different working conditions |
| CN110739871B (en) * | 2019-09-23 | 2020-10-02 | 中国南方电网有限责任公司超高压输电公司广州局 | Alternating current charging control strategy suitable for hybrid MMC under two working conditions of short circuit and no short circuit on direct current side |
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Application publication date: 20171103 |