CN108155826A - Consider the investment appraisal model of the flexible direct current transverter of redundancy - Google Patents
Consider the investment appraisal model of the flexible direct current transverter of redundancy Download PDFInfo
- Publication number
- CN108155826A CN108155826A CN201711472650.6A CN201711472650A CN108155826A CN 108155826 A CN108155826 A CN 108155826A CN 201711472650 A CN201711472650 A CN 201711472650A CN 108155826 A CN108155826 A CN 108155826A
- Authority
- CN
- China
- Prior art keywords
- submodule
- redundancy
- work
- mmc
- failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000004224 protection Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009183 running Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000009021 linear effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention relates to a kind of investment appraisal models for the flexible direct current transverter for considering redundancy, belong to flexible direct-current transmission field.Special redundancy submodule is not set, all submodule rotation works are not involved in the redundancy submodule taken turns thus of work；Within the work period, suitable n are chosen from 2 (n+m) a submodules of a phase to devote oneself to work, remaining sequence and the switching operation that all redundancy submodules also moment are participated in submodule, by bypassing failure submodule after failure, input redundancy submodule takes over the work of failure submodule, can at most hold m submodule and break down.It can guarantee that MMC is constantly in symmetrical operation, there is the situation of asymmetric operation compared to other schemes, the harmonic circulating current of generation is smaller, simultaneously compared with the problem of needing charge to it before redundancy submodule input in other schemes, effectively reduce the charging time, it is only necessary to determine that the submodule of input is completed it input and acted by selection strategy.
Description
Technical field
The present invention relates to flexible direct-current transmission field, more particularly to a kind of investment for the flexible direct current transverter for considering redundancy
Assessment models.
Background technology
From the high voltage dc transmission technology based on voltage source converter (Voltage source converter, VSC)
Since (High voltage direct current, HVDC) occurs, the commutation components of direct current transportation are reformed constantly.It is early
The HVDC of phase is using two level or three-level converter technology, valve is directly connected by a large amount of IGBT, although circuit structure
Simply, but technical difficulty is very big, and is lost higher.Modularization multi-level converter (Modular multilevel
Converter, MMC) be a kind of novel voltage source converter, the structure for having high modularization, be easy to expansion system and
Realize Redundant Control, switching frequency is low, and output voltage waveforms are good, is widely used in flexible DC power transmission in recent years
(VSC-HVDC).Flexible DC power transmission compares traditional HVDC Transmission Technology, there is very big advantage.Can such as adjust simultaneously it is active and
It is idle, it carries out power conveying and power grid can be stablized；It can be that passive network is powered, not need to reactive-load compensation；Without changing
Stream communicates between station；Harmonics level is low, reduces filter capacity；Using DC line asynchronous interlinkage between large regional grid, can avoid
Alternating current-direct current transmission line malfunction arranged side by side；The Emergency Assistance of active power and reactive power to system can be provided simultaneously, make it can
The renewable sources of energy are grid-connected, played to fields such as Special section and energy shortages regional power supply, island power supply, Asynchronous Communication Power System Interconnections
Distinctive advantage.Moreover, the centre of traditional two-terminal direct current transmission system is overhead transmission line, and flexible DC power transmission is using underground electricity
Cable can not only reduce the adverse effect in terms of appearance and environment, moreover it is possible to eliminate transmission line of electricity by lightning fault and forest fire
Influence.So as to play greatest benefit.
The voltage of MMC DC sides is mainly supported by submodule (Sub-module, SM) capacitance voltage, the switching shape of submodule
State determines the working condition of MMC, and failure submodule influences system normal operation in order to prevent, it is necessary to redundancy submodule is set, it is right
Redundancy submodule, which carries out a series of researchs, can make redundant system play greatest benefit.Modularization multi-level converter has altitude module
The structure of change.Switching frequency is low, many advantages, such as being easy to expansion system, but MMC is cascaded by multiple submodule, output work
Submodule can be largely relied on, once there is submodule to break down, MMC normal works will be influenced, be so as to reduce
System reliability of operation, it is therefore necessary to which a certain number of redundancy submodules are set, and redundant module can replace failure submodule, protect
Card system safety and stability, the research of MMC redundancy runnings control are particularly important.For flexible DC power transmission construction and put into operation
How Cheng Zhong, select transverter model on the basis of redundancy is considered, investment appraisal is carried out to selected model.
Invention content
The purpose of the present invention is to provide a kind of investment appraisal models for the flexible direct current transverter for considering redundancy, solve
The above problem of the existing technology.For the redundancy structure transverter of n+m submodule, since level number does not change, institute
It is constant with the submodule number that input state is on a bridge arm, remains n, and cuts off the number of state submodule
Than irredundant structure MMC bridge arms more than m.For this m redundancy submodule, the stand-by state of redundancy submodule is considered, needing
It can quickly be put into when wanting, replace failure submodule, select most suitable redundancy submodule quantity, obtain MMC redundancy structures
It is most efficient to utilize.
On the basis of existing redundant module structure, a kind of new dynamic redundancy scheme is proposed.By all submodules in turn
It puts into operation, i.e., redundancy SM also assists in period internal sort and switching operation.Failure SM, input redundancy SM are bypassed after breaking down
Instead of ensureing that MMC quickly resumes work, and the redundancy strategy can guarantee that MMC is constantly in symmetrical operation, going out compared to other schemes
The situation of existing asymmetric operation, the harmonic circulating current of generation are smaller.
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
Consider the investment appraisal model of the flexible direct current transverter of redundancy, be not provided with specific redundancy SM, but all
It chooses suitable n in submodule to devote oneself to work, the remaining redundancy SM as in this period.
Special redundancy submodule is not set, all submodule rotation works are not involved in the redundancy taken turns thus of work
Submodule；Within the work period, suitable n are chosen from 2 (n+m) a submodules of a phase and is devoted oneself to work, it is remaining by institute
Having redundancy submodule, also the moment participates in sequence and the switching operation of submodule, by bypassing failure submodule after failure, puts into
Redundancy submodule takes over the work of failure submodule, can at most hold m submodule and break down.
The beneficial effects of the present invention are：The redundancy strategy can guarantee that MMC is constantly in symmetrical operation, compared to other schemes
There is the situation of asymmetric operation, the harmonic circulating current of generation is smaller, while with being needed before redundancy submodule input in other schemes
Compared the problem of charging to it, effectively reduce the charging time, it is only necessary to the son of input is determined by selection strategy
Module completes it input action.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and forms the part of the application, this hair
Bright illustrative example and its explanation do not constitute improper limitations of the present invention for explaining the present invention.
Fig. 1 is abstract of description attached drawing；
Fig. 2 is the equivalent circuit diagram of MMC redundancy structures；
Fig. 3 is the reliability curve figure based on SM number of redundancy；
Fig. 4 is redundancy submodule quantity configuration figure；
Fig. 5 is dynamic redundancy protection scheme block diagram.
Specific embodiment
The detailed content and its specific embodiment further illustrated the present invention below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Fig. 5, it is of the invention the considerations of redundancy flexible direct current transverter investment appraisal model, MMC's
Stable operation is related to the reliability and stability of MMC-HVDC systems, and redundancy submodule is the important means of MMC error protections,
Other normal submodules or system function can be influenced when there is sub-module fault to avoid MMC.With voltage class
Raising, power module quantity will be substantially improved, and in the case of longtime running, power module failure is inevitable, to avoid it
The normal operation of influence system, needs to configure redundant module.When operational module failure, bypassed first, then use redundancy
Module works instead of malfunctioning module, ensures the safe and reliable operation of system.For redundancy submodule quantity, configuration is more, and system can
It is higher by property, but cost is also higher.And redundancy submodule utilization rate is relatively low, it is uneconomical；Configuration is fewer, and cost is relatively low, but is
The reliability of system cannot ensure.Therefore, rationally, effectively configuring redundancy submodule quantity is particularly significant.Accordingly, it is considered to it designs
The investment appraisal model of the flexible direct current transverter of redundancy structure is of great significance for Practical Project and relation technological researching.
The three-phase MMC of n+m redundancy structures, each bridge arm have n+m SM, wherein n common SM, m redundancy SM.In general, in n numbers
When measuring smaller, m takes 1 or 2.Sub-modular structure is constant or by an IGBT half-bridge, two anti-paralleled diodes and one
Storage capacitor is formed.The present invention proposes a kind of new redundancy scheme, that is, is not provided with specific redundancy SM, but in all submodules
Middle suitable n of selection is devoted oneself to work, the remaining redundancy SM as in this period.All submodules are put into operation in turn,
I.e. redundancy SM also assists in period internal sort and switching operation.Failure SM is bypassed after breaking down, input redundancy SM is replaced, ensured
MMC quickly resumes work, and the redundancy strategy can guarantee that MMC is constantly in symmetrical operation.
It is shown in Figure 2, the equivalent circuit diagram of MMC redundancy structures.
It is smaller in level number, it is generally 1 or 2 to the number of the redundancy submodule of MMC configurations.If level
Number is larger, then needs using special quantity configuration computational methods, to ensure that system can obtain the configuration of best price/performance ratio.It is fixed
Justice MMC system reliabilities in a period of time t are RMMC, the reliability of submodule is RSM.And SM is mainly by IGBT, FWD and electricity
Container composition, reliability codetermines [45] by the reliability of contained IGBT, diode and capacitor.Set IGBT
Reliability be RI, the reliability of FWD is RF, the reliability of capacitor is RC, SM contains 2 IGBT, 2 FWD, 1 capacitance
Device, it may be considered that the reliability R of SMSMFor：
The major power unit of MMC is SM, it is possible to think that the reliability of MMC is also just mainly determined by the reliability of SM
It is fixed, for simplifying the analysis, only consider influence of the SM reliabilities to MMC reliabilities, other devices and auxiliary device are put aside.It is right
In there is n common SM on the MMC of n+m redundancy structures a, bridge arm, m redundancy SM, a MMC have 6 bridge arms, can allow m
A submodule breaks down, according to probability theory knowledge, it is known that the reliability R of MMCMMCFor：
In formula, i is the number of failure SM on a bridge arm.
Under the conditions of the redundancy SM of identical quantity, the total submodule number of MMC bridge arms is more, then MMC reliabilities are lower；And in son
MMC in the case that number of modules is identical, redundancy submodule configuration is more, and reliability is bigger.But redundancy SM quantity is bigger, it is practical
Cost is higher, and operation and the difficulty safeguarded also further increase, and find the variation of redundant configuration quantity to MMC reliability effects
Rule can obtain the redundancy SM quantity of most cost performance, not only ensure the reliability of system, but also can reduce certain cost.
With the variation of m, the reliability curve of MMC is fitted letter as shown in figure 3, multinomial least square method is taken to obtain it
Number f (x) ask its second order differentiation function that can obtain the inflection point x of f (x) according to mathematical knowledge1、x2。
The reliability index for enabling MMC is IMMC：
In formula, RMMC(M1) be SM number of redundancy it is M1When MMC reliabilities, RMMC(M2) be SM number of redundancy it is M2When
Reliability, M1For x1Round up gained number, M2For x2Number obtained by downward rounding.
In the curve, SM number of redundancy is discrete, SM number of redundancy is caused in practical application for integer, so right
x1And x2It rounds up respectively and downward rounding.As seen from Figure 4, slope of a curve meaning is increases redundancy submodule
The MMC reliabilitys that number m is improved, IMMCWhat is represented is the reliability in region (x1, x2).In region (x1, x2) in, RMMC
As M approximately linears change, outside the region, reliable point variation is slow.So the level number as MMC is more, SM number is more
When, it can be considered according to the curve in region (x1, x2) configuring redundancy submodule number, with reference to practical application, it is economical situations such as,
According to redundancy submodule quantity configuration block diagram shown in Fig. 4, most suitable redundancy submodule number m is selected.
It is shown in Figure 5, it is the functional block diagram of dynamic redundancy scheme.Special redundancy submodule, Suo Youzi are not set
Module rotation work is not involved in the redundancy submodule taken turns thus of work.Within the work period, from 2 (n+m) height of a phase
Suitable n is chosen in module to devote oneself to work, it is remaining by all redundancy submodules also moment participate in submodule sequence and
Switching operation, by bypassing failure submodule after failure, input redundancy submodule is taken over the work of failure submodule, can at most be held
Lower m submodule breaks down.
The foregoing is merely the preferred embodiments of the present invention, are not intended to restrict the invention, for the technology of this field
For personnel, the invention may be variously modified and varied.All any modification, equivalent substitution, improvement and etc. made for the present invention,
It should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of investment appraisal model for the flexible direct current transverter for considering redundancy, it is characterised in that：It is not provided with specific redundancy
SM, but suitable n are chosen in all submodules and is devoted oneself to work, the remaining redundancy SM as in this period.
2. the investment appraisal model of the flexible direct current transverter according to claim 1 for considering redundancy, it is characterised in that：No
Set special redundancy submodule, all submodule rotation works are not involved in the redundancy submodule taken turns thus of work；In work
Make in the period, suitable n are chosen from 2 (n+m) a submodules of a phase and is devoted oneself to work, it is remaining by all redundancy submodules
Also the moment participates in sequence and the switching operation of submodule to block, by bypassing failure submodule after failure, puts into redundancy submodule
The work of failure submodule is taken over, m submodule can be at most held and break down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711472650.6A CN108155826A (en) | 2017-12-29 | 2017-12-29 | Consider the investment appraisal model of the flexible direct current transverter of redundancy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711472650.6A CN108155826A (en) | 2017-12-29 | 2017-12-29 | Consider the investment appraisal model of the flexible direct current transverter of redundancy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108155826A true CN108155826A (en) | 2018-06-12 |
Family
ID=62463889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711472650.6A Pending CN108155826A (en) | 2017-12-29 | 2017-12-29 | Consider the investment appraisal model of the flexible direct current transverter of redundancy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108155826A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683040A (en) * | 2018-12-25 | 2019-04-26 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Reliability checking method, device and the equipment of flexible direct current transmission converter valve |
| CN109801899A (en) * | 2018-12-27 | 2019-05-24 | 全球能源互联网研究院有限公司 | A kind of power semiconductor modular |
-
2017
- 2017-12-29 CN CN201711472650.6A patent/CN108155826A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683040A (en) * | 2018-12-25 | 2019-04-26 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Reliability checking method, device and the equipment of flexible direct current transmission converter valve |
| CN109683040B (en) * | 2018-12-25 | 2021-10-15 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Method, device and equipment for detecting reliability of flexible direct-current transmission converter valve |
| CN109801899A (en) * | 2018-12-27 | 2019-05-24 | 全球能源互联网研究院有限公司 | A kind of power semiconductor modular |
| CN109801899B (en) * | 2018-12-27 | 2021-04-23 | 全球能源互联网研究院有限公司 | Power semiconductor module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Soong et al. | Evaluation of emerging modular multilevel converters for BESS applications | |
| CN103337951B (en) | A kind of implementation method of the MMC redundancy protecting strategy based on phase-shifting carrier wave modulation | |
| Guo et al. | Reliability modeling and evaluation of MMCs under different redundancy schemes | |
| CN106787885B (en) | A kind of MMC System Fault Tolerance control method of irredundant submodule | |
| US8730696B2 (en) | Multi-level voltage converter | |
| CN106452136A (en) | Multi-port power electronic converter for energy internet | |
| WO2012024984A1 (en) | Modular multilevel converter-based transformerless battery energy storage topology | |
| CN112152496B (en) | Bridge arm multiplexing modular multilevel converter | |
| CN105634259A (en) | Reliability analysis and redundancy configuration calculation method for hybrid modular multilevel converter | |
| CN108306320A (en) | A kind of energy accumulation current converter and energy storage converter system | |
| Zhang et al. | A modular multilevel converter-based grid-tied battery-supercapacitor hybrid energy storage system with decoupled power control | |
| CN106410932A (en) | Chained battery energy storage converter suitable for medium-voltage DC power distribution network and control method | |
| CN105743360A (en) | Distributed sub module control method, device and system | |
| CN108155826A (en) | Consider the investment appraisal model of the flexible direct current transverter of redundancy | |
| Delavari et al. | A comparative study of different multilevel converter topologies for battery energy storage application | |
| Madichetty et al. | A survey and experimental verification of modular multilevel converters | |
| CN106208649A (en) | The failure reconfiguration method that parallel connection type current transformer controls based on virtual brachium pontis | |
| CN104037754A (en) | Modularized multi-level flexible DC (Direct Current) topology circuit applicable to fault ride-through | |
| Bezhenar et al. | Multilevel inverter as var-compensator | |
| Hussain et al. | Current controlled operation of cascaded H-bridge converter for fast SoC balancing in grid energy storage | |
| Cheng et al. | Hot-swappable grid-connected multilevel converter for battery energy storage system | |
| Pires et al. | PV generators combined with UPQC based on a dual converter structure | |
| Dhekekar et al. | H-Bridge Cascade Multilevel VSC Control for Effective VAR Compensation of Transmission Line | |
| Lu et al. | Comparison Analysis of the Flexible Sub-module voltage modulation and NLM for MMC-DC grid | |
| CN205754046U (en) | The distributed half-bridge of auxiliary capacitor based on equality constraint/full-bridge series-parallel connection MMC is from all pressing topology |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180612 |