CN105958856A - Novel hybrid MMC topology with capabilities of direct current fault removing and partial automatic voltage sharing - Google Patents
Novel hybrid MMC topology with capabilities of direct current fault removing and partial automatic voltage sharing Download PDFInfo
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- CN105958856A CN105958856A CN201610451209.9A CN201610451209A CN105958856A CN 105958856 A CN105958856 A CN 105958856A CN 201610451209 A CN201610451209 A CN 201610451209A CN 105958856 A CN105958856 A CN 105958856A
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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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides a novel hybrid MMC topology with capabilities of direct current fault removing and partial automatic voltage sharing. In the power transmission and distribution technical field, each bridge arm of the novel MMC consists of two kinds of novel MMC sub modules, a bridge arm inductor and the like which are connected in series; the two kinds of the novel MMC sub module topologies comprise a Double Half-bridge Sub-module (D-HBSM) and a paralleled Full-bridge Sub-module (P-FBSM); the D-HBSM is obtained by turnover of the reverse serial-connection topology of two half-bridge sub modules, and has a partial automatic voltage sharing capability; and the P-FBSM is obtained by turnover of the full-bridge sub module, and has the global automatic voltage sharing capability. According to the two kinds of novel sub module topologies, the sub modules in the bridge arm have the partial or global automatic voltage sharing capability through topology reconstruction under the premise of not increasing the number of the power electronic devices and maintaining the direct current fault removing capability of the MMC system, so that the requirement on the capacitance value can be lowered under the same capacitor voltage ripple wave amplitude.
Description
Technical field
The invention belongs to power transmission and distribution technical field, be specifically related to have DC Line Fault concurrently and remove and locally from the novel mixing MMC topology of equal pressure energy power.
Background technology
Use voltage source converter D.C. high voltage transmission (the Voltage Source Converter of wholly-controled device
Based HVDC, VSC-HVDC) have four-quadrant independently control meritorious and reactive power, be easy to trend reversion, can be as unique technology advantages such as black starting-up power supplys.Modularization multi-level converter (Modular Multilevel Converter, MMC) it is a kind of novel VSC topology, on the basis of there is above-mentioned advantage, use the mode of sub module cascade, avoid the problems such as triggering concordance and short-circuit failure that in two, three level VSC, the series connection of power device compression joint type is caused, it has also become the development trend of VSC-HVDC.
At present, MMC-HVDC faces the problem that direct fault current fast and reliable is removed.The MMC-HVDC engineering put into operation uses semi-bridge type submodule (Half-bridge Sub-module, HBSM) mostly, though DC Line Fault occur after the reliable locking of MMC, due in submodule with igbt (Insulated Gate Bipolar
Transistor, IGBT) the afterflow effect of anti-paralleled diode, AC system is still continuously fed to short circuit current by MMC to DC Line Fault point, so that it does not possess dc-side short-circuit electric current Scavenging activity.Owing to the direct fault current spread speed of MMC-HVDC is exceedingly fast, cannot meet rapidity requirement in view of AC circuit breaker, dc circuit breaker technology is immature and half-bridge MMC cannot block the factors such as direct fault current, in the state of the art, the novel MMC topology possessing direct fault current Scavenging activity is used to become the feasible program solving MMC-HVDC DC Line Fault problem.
Being supported different from two level, three level VSC DC voltages by a bulky capacitor, the DC voltage of MMC is supported by a series of separate submodule capacitances in series.In order to ensure that in waveform quality that AC voltage exports and module, each power semiconductor bears identical stress, also for preferably supporting DC voltage, it is necessary to assure the concordance of submodule capacitor voltage and stability.Sequence based on submodule capacitor voltage sequence all presses algorithm to be the main flow thinking solving MMC Neutron module capacitance voltage equalization problem at present, all demonstrates its good all pressures effect, but there is also some inherent shortcomings in emulation and practice.First, the realization of ranking function has to rely on the Millisecond sampling of capacitance voltage, needs substantial amounts of sensor and optical-fibre channel to match；Secondly, when group number of modules increases, the operand of capacitance voltage sequence increases rapidly, and the hardware designs for controller brings huge challenge；Additionally, submodule is cut-off frequency and has the highest requirement by realizations of sequence all pressure algorithms, cut-off frequency and be closely related with all pressure effects, may all press for guarantee effect improve the triggering frequency of submodule in practice, and then bring the increase that inverter is lost.
Document " A submodule implementation
for parallel connection of capacitors in modular multilevel converters”“Modular multilevel
Converter with series and parallel module connectivity:topology and control " propose double half-bridge submodule (Double Half-bridge respectively
Sub-module, D-HBSM) and full-bridge submodule (Paralleled Full-bridge in parallel
Sub-module, P-FBSM), both novel submodule topologys have in various degree from equal pressure energy power.But original text is offered the submodule characteristic only for single type and is analyzed, it is not directed to the research of the mixing MMC characteristic the two mixed, and original text is offered and all used phase-shifting carrier wave sinusoidal pulse width modulation (the Carrier Phase being applicable to low-voltage low capacity
ShiftedSinusoidal Pulse Width Modulation, CPS-SPWM), the nearest level not extending to generally use in high-voltage large-capacity MMC-HVDC engineering approaches modulation (Nearest Level Modulation, NLM), the many theory and technology problems therefore faced need further investigation.
Summary of the invention
For the problems referred to above, on the basis of academia is to modular multi-level converter topological structure research, the present invention is by two kinds of novel submodule mixed configuration in brachium pontis of D-HBSM and P-FBSM, nearest level is used to approach modulation, design corresponding submodule switching logic, give full play to the voltage support ability of D-HBSM and the DC Line Fault Scavenging activity of P-FBSM, and two seed module in various degree from equal pressure energy power, propose a kind of DC Line Fault that has concurrently and remove and local is from the novel mixing MMC topology of equal pressure energy power.
What the present invention proposed has DC Line Fault removing and the local novel mixing MMC topology from equal pressure energy power concurrently, in the case of considering switching device parallel connection, obtained by the way of overturning reconstruction by tradition submodule topology, with conventional hybrid MMC, there is identical power device quantity and voltage fan-out capability.Respective from uniform voltage function in order to realize, the on off state collection of zygote module devises corresponding switch triggering logic, ensure that the DC Line Fault Scavenging activity of mixing MMC simultaneously.
Accompanying drawing explanation
Fig. 1 is the novel mixing MMC entirety topological diagram being made up of two seed module；
Fig. 2 is the structural representation of double half-bridge submodule (D-HBSM) topology；Wherein, T11、T12、T21、T22、T31、T32、T41、T42Represent insulated gate bipolar transistor, D11、D12、D21、D22、D31、D32、D41、D42Representing diode, C1, C2 represent capacitor；U C1、U C2Represent submodule capacitor voltage；
Fig. 3 is that D-HBSM bypasses output 0 level schematic diagram completely；
Fig. 4 is D-HBSM topology electric capacity Parallel opertationU CLevel conditions one schematic diagram；
Fig. 5 is D-HBSM topology electric capacity Parallel opertationU CLevel conditions two schematic diagram；
Fig. 6 is the series connection C1 bypass C2 output of D-HBSM topologyU CLevel schematic diagram；
Fig. 7 is the bypass C1 series connection C2 output of D-HBSM topologyU CLevel schematic diagram；
Fig. 8 is D-HBSM topology output 2U CLevel schematic diagram；
Fig. 9 is full-bridge submodule (P-FBSM) topological structure schematic diagram in parallel；Wherein, T11、T12、T21、T22、T31、T32、T41、T42Represent insulated gate bipolar transistor, D11、D12、D21、D22、D31、D32、D41、D42Representing diode, C represents capacitor；U CRepresent submodule capacitor voltage；
Figure 10 is that P-FBSM bypasses situation one schematic diagram；
Figure 11 is that P-FBSM bypasses situation two schematic diagram；
Figure 12 is that P-FBSM adjacent submodule electric capacity is connected in parallel schematic diagram；
Figure 13 be P-FBSM output-U CLevel schematic diagram；
Figure 14 is P-FBSM outputU CLevel schematic diagram.
Detailed description of the invention
For performance and the operation principle of the present invention are expanded on further, below in conjunction with accompanying drawing, the constituted mode of invention is specifically described with operation principle.
Fig. 1 is the mixing MMC current conversion station schematic diagram being made up of two kinds of novel submodules.Six brachium pontis of three-phase, according to identical two kinds of novel submodules of proportional arrangement, make MMC system have submodule electric capacity concurrently from equal pressure energy power and DC Line Fault Scavenging activity.
Fig. 2 is double half-bridge submodule (D-HBSM) topologys, two HBSM anti-series topologys be inverted and obtain.One D-HBSM comprises 8 IGBT switches set and two electric capacity, remains the number of devices identical for HBSM with two and voltage fan-out capability.Under normal operation, single D-HBSM can export 0,U C、2U CThree kinds of level.Representing IGBT switch conduction with " 1 " below, " 0 " represents shutoff.Submodule exports current path that 0 level i.e. bypasses as it is shown on figure 3, T11~T42Corresponding on off state is 11000011 successively；Submodule electric capacity Parallel opertationU CThe current path of level conditions one as shown in Figure 4, T11~T42Corresponding on off state is 10011001 successively；Submodule electric capacity Parallel opertationU CThe current path of level conditions two is as it is shown in figure 5, T11~T42Corresponding on off state is 01100110 successively；Submodule series connection C1 bypass C2 outputU CThe current path of level as shown in Figure 6, T11~T42Corresponding on off state is 00110011 successively；Submodule bypass C1 series connection C2 outputU CThe current path of level is as it is shown in fig. 7, T11~T42Corresponding on off state is 11001100 successively；Submodule output 2U CThe current path of level as shown in Figure 8, T11~T42Corresponding on off state is 00111100 successively.Wherein, in order to exportU CLevel, should not accessed single electric capacity, and should be coordinated by switch conduction and make two electric capacity C1 and C2 Parallel opertation.In moment in parallel,U C1It is equal toU C2, it is achieved that submodule from uniform voltage function.Owing to this all pressures are limited between two electric capacity of a sub-inside modules, therefore referred to as local is from all pressing.
Fig. 9 is full-bridge submodule (P-FBSM) topology in parallel, a FBSM obtain through switch upset.One P-FBSM comprises 8 IGBT switches set and 1 electric capacity, remains the number of devices identical for FBSM with 1 and voltage fan-out capability.Under normal operation, single P-FBSM can export 0,U C、-U CThree kinds of level.Representing IGBT switch conduction with " 1 " below, " 0 " represents shutoff.Submodule exports 0 level and i.e. bypasses the current path of situation one as shown in Figure 10, T11~T42Corresponding on off state is 11001100 successively；Submodule exports 0 level and i.e. bypasses the current path of situation two as shown in figure 11, T11~T42Corresponding on off state is 00110011 successively；Submodule neighbour's submodule electric capacity is connected in parallel schematic diagram as shown in figure 12, T11~T42Corresponding on off state is 01101001 successively；Submodule output-U CThe current path of level as shown in figure 13, T11~T42Corresponding on off state is 11000011 successively；Submodule series connection outputU CThe current path of level as shown in figure 14, T11~T42Corresponding on off state is 00111100 successively.Group wired in parallel exportsU CLevel, two adjacent submodule electric capacity are in parallel, it is achieved that submodule from uniform voltage function.If in a brachium pontis, the most all multiple submodule electric capacity exist parallel connection, thus realize the equilibrium of its voltage, the most overall from all pressing.
Owing to novel submodule topology possesses partly or wholly from uniform voltage function, make electric capacity parallel connection reach all by specific conducting state and press effect, so can simplify even cancellation sequence and all press algorithm.Now determine that the factor which submodule puts into will be submodule charge and discharge balancing control mechanism.For D-HBSM, two electric capacity that D-HBSM is comprised, in identical parallel branch, carry out charge and discharge process simultaneously, and its voltage should keep equal or closely the moment.For give full play to D-HBSM from uniform voltage function, two electric capacity in submodule should be made in parallel with output as far as possibleU CLevel.P-FBSM compares the tradition many ports of MMC submodule, controls more flexible, has overall from uniform voltage function.All press characteristic for making full use of parallel connection, electric capacity between submodule should be made the most in parallel.P-FBSM relies on parallel process all to press, it is not necessary to submodule capacitor voltage information, when making full use of all submodule parallel connections, it is believed that each submodule capacitor voltage difference is the least；For making the change of all submodule capacitor voltage reach unanimity, capacitor charge and discharge process should be uniformly distributed between each submodule, i.e. take switches set rotation conducting strategy.
P-FBSM is by FBSM overturning reconstruction, and it is identical with FBSM that it removes direct fault current principle.In the MMC-HVDC system comprising P-FBSM, when DC side generation one pole ground connection or double-click short trouble, along with the charge effects putting into module capacitance, ensure that and put into module capacitance voltage sum rapidly more than the amplitude of alternating voltage, thus realize the reverse bias of diode, reach to suppress the effect of fault current.
Being illustrated from above-mentioned, in conjunction with suitable control method, the novel mixing MMC topology proposed possesses DC Line Fault and removes with submodule capacitor voltage from the ability of equalization.
Finally should be noted that: described embodiment is only some embodiments of the present application rather than whole embodiments.Based on the embodiment in the application, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of the application protection.
Claims (5)
1. have DC Line Fault concurrently to remove and locally from the novel mixing MMC topology of equal pressure energy power, it is characterised in that: including the MMC model being made up of A, B, C three-phase, A, B, C three-phase is respectively by 2NIndividual submodule and 2 brachium pontis reactors are in series；At every half brachium pontis mutuallyNIn individual submodule, haveMIndividual pair of half-bridge submodule (Double Half-bridge Sub-module, D-HBSM) and (N-M) individual full-bridge submodule (Paralleled Full-bridge Sub-module, P-FBSM) in parallel, whereinM、NIt is positive integer, andM<N。
2. remove and locally from the novel mixing MMC topology of equal pressure energy power according to the DC Line Fault that has concurrently described in right 1, it is characterized in that: when considering IGBT switches set parallel connection, the double half-bridge submodule (D-HBSM) of novel submodule topology that novel mixing MMC topology is comprised is inverted reconstruct by two half-bridge submodules (Half-bridge Sub-module, HBSM) anti-series topology and obtains；
One D-HBSM remains the number of devices identical for HBSM with two and voltage fan-out capability, can export 0,U C、2U CThree kinds of level；
When D-HBSM exportsU CTime, the on off state of Rational choice IGBT, it is possible to achieve the parallel connection of two electric capacity in submodule, thus realize the local of internal two electric capacity of each D-HBSM from voltage.
3. remove and locally from the novel mixing MMC topology of equal pressure energy power according to the DC Line Fault that has concurrently described in right 1, it is characterized in that: when considering IGBT switches set parallel connection, novel submodule topology parallel connection full-bridge submodule (P-FBSM) that novel mixing MMC topology is comprised is inverted reconstruct is obtained by full-bridge submodule (Full-bridge Sub-module, FBSM) topology；
One P-FBSM remains the number of devices identical for FBSM with and voltage fan-out capability, can export 0,U C、-U CThree kinds of level；
By the control of IGBT can make arbitrary neighborhood P-FBSM electric capacity in parallel, the MMC of P-FBSM is therefore used to possess overall from equal pressure energy power.
4. remove and locally from the novel mixing MMC topology of equal pressure energy power according to the DC Line Fault that has concurrently described in right 1, it is characterised in that: P-FBSM is overturn by FBSM, possesses direct fault current clamping ability；
This topology is applied in direct current transportation, when DC side generation one pole ground connection or bipolar short trouble, along with the charge effects putting into module capacitance, ensure that and put into module capacitance voltage sum rapidly more than the amplitude of alternating voltage, thus realize the reverse bias of diode, reach to suppress the effect of fault current；
P-FBSM with D-HBSM composition is mixed MMC, may be used for removing DC Line Fault.
5. remove and locally from the novel mixing MMC topology of equal pressure energy power according to the DC Line Fault that has concurrently described in right 1, it is characterized in that: have DC Line Fault concurrently and remove and locally from the novel mixing MMC topology of equal pressure energy power, not only serve as multi-level voltage source current converter and directly apply to flexible direct-current transmission field, also can be similar to the device of MMC by principle of compositionality and be applied to flexible AC transmission field；Other application scenarios of this invention topology of indirect utilization and thought are in interest field.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453635A (en) * | 2017-09-01 | 2017-12-08 | 东南大学 | A kind of hybrid modular multi-level converter topological structure of n+1 and its control strategy |
| CN107748313A (en) * | 2017-10-16 | 2018-03-02 | 华北电力大学 | Based on or logic identification HBSM MMC internal short circuit faults method |
| CN107769598A (en) * | 2017-10-26 | 2018-03-06 | 华北电力大学 | A kind of new Two-port netwerk half-bridge full-bridge mixing submodule MMC topologys |
| CN107800317A (en) * | 2017-10-26 | 2018-03-13 | 华北电力大学 | A kind of parallel half-bridge full-bridge mixing submodule MMC topologys |
| CN107834868A (en) * | 2017-10-25 | 2018-03-23 | 华北电力大学 | A kind of capacitor voltage balance method of the MMC submodules mixed based on double half-bridges and full-bridge in parallel |
| CN107911023A (en) * | 2017-11-07 | 2018-04-13 | 天津大学 | The more level dynamic switching DC DC transformers of cascade moduleization |
| CN107947213A (en) * | 2016-10-12 | 2018-04-20 | 特变电工新疆新能源股份有限公司 | A kind of startup method of the Multi-end flexible direct current transmission system containing full-bridge modules |
| CN108763835A (en) * | 2018-07-06 | 2018-11-06 | 国网浙江省电力有限公司电力科学研究院 | Modularization multi-level converter topology reconstruction type submodule and its modeling method |
| CN111559266A (en) * | 2020-06-10 | 2020-08-21 | 南京工程学院 | Charging device for electric automobile |
| CN111756265A (en) * | 2020-07-28 | 2020-10-09 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN112134253A (en) * | 2020-08-19 | 2020-12-25 | 许继集团有限公司 | Unbalance identification and protection method of direct current energy consumption device |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107947213A (en) * | 2016-10-12 | 2018-04-20 | 特变电工新疆新能源股份有限公司 | A kind of startup method of the Multi-end flexible direct current transmission system containing full-bridge modules |
| CN107947213B (en) * | 2016-10-12 | 2021-04-13 | 特变电工新疆新能源股份有限公司 | Starting method of multi-terminal flexible direct-current power transmission system with full-bridge module |
| CN107453635A (en) * | 2017-09-01 | 2017-12-08 | 东南大学 | A kind of hybrid modular multi-level converter topological structure of n+1 and its control strategy |
| CN107748313A (en) * | 2017-10-16 | 2018-03-02 | 华北电力大学 | Based on or logic identification HBSM MMC internal short circuit faults method |
| CN107748313B (en) * | 2017-10-16 | 2019-12-03 | 华北电力大学 | Based on or logic identification HBSM-MMC internal short circuit fault method |
| CN107834868A (en) * | 2017-10-25 | 2018-03-23 | 华北电力大学 | A kind of capacitor voltage balance method of the MMC submodules mixed based on double half-bridges and full-bridge in parallel |
| CN107800317A (en) * | 2017-10-26 | 2018-03-13 | 华北电力大学 | A kind of parallel half-bridge full-bridge mixing submodule MMC topologys |
| CN107769598A (en) * | 2017-10-26 | 2018-03-06 | 华北电力大学 | A kind of new Two-port netwerk half-bridge full-bridge mixing submodule MMC topologys |
| CN107911023A (en) * | 2017-11-07 | 2018-04-13 | 天津大学 | The more level dynamic switching DC DC transformers of cascade moduleization |
| CN108763835A (en) * | 2018-07-06 | 2018-11-06 | 国网浙江省电力有限公司电力科学研究院 | Modularization multi-level converter topology reconstruction type submodule and its modeling method |
| CN108763835B (en) * | 2018-07-06 | 2024-05-10 | 国网浙江省电力有限公司电力科学研究院 | Topological reconstruction sub-module of modularized multi-level converter and modeling method thereof |
| CN111559266A (en) * | 2020-06-10 | 2020-08-21 | 南京工程学院 | Charging device for electric automobile |
| CN111756265A (en) * | 2020-07-28 | 2020-10-09 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN111756265B (en) * | 2020-07-28 | 2023-09-01 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN112134253A (en) * | 2020-08-19 | 2020-12-25 | 许继集团有限公司 | Unbalance identification and protection method of direct current energy consumption device |
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Application publication date: 20160921 |