CN104320011B - Hybrid sub-module MMC converter with direct-current fault ride-through capability - Google Patents
Hybrid sub-module MMC converter with direct-current fault ride-through capability Download PDFInfo
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- CN104320011B CN104320011B CN201410558336.XA CN201410558336A CN104320011B CN 104320011 B CN104320011 B CN 104320011B CN 201410558336 A CN201410558336 A CN 201410558336A CN 104320011 B CN104320011 B CN 104320011B
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- bridge
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- mmc
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without 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
- H02M7/217—Conversion of ac power input into dc power output without 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
- H02M7/25—Conversion of ac power input into dc power output without 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 arranged for operation in series, e.g. for multiplication of voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
-
- 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
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
Abstract
The invention relates to a hybrid sub-module MMC (multimedia card) converter with direct-current fault ride-through capability. The hybrid sub-module MMC is similar to the half-bridge MMC in topology, namely a three-phase six-bridge structure, but the single bridge is successively cascaded by m half-bridge sub-modules (HBSM), n full-bridge sub-modules (FBSM) and one clamp dual sub-module (CDSM); the high direct-current voltage utilization rate of FBSM, the direct-current fault current self-cleaning of FBSM and CDSM and the economic advantage of HBSM are integrated to optimally select the amount of m, n and one according to the actual demand, so that the converter can be applied to a flexible direct-current transmission system, in particular, to an occasion with the higher commissioning rate, when the system has one direct-current fault, it is promoted in capacity to save the economic cost under existence of the direct-current fault ride-through capability.
Description
Technical field
The present invention relates to Power System Flexible direct current transmission and distribution, power electronics and custom power technology field, specifically will relate to
And a kind of flexible DC power transmission MMC converter valves topology for possessing DC Line Fault ride-through capability.
Background technology
Direct-current short circuit failure is a kind of most commonly seen failure of MMC-HVDC systems, and tradition is based on semibridge system submodule
MMC inverters cannot cut off AC system in DC bipolar short trouble to direct-current short circuit point by locking submodule IGBT
Energy regenerative loop, it is necessary to faster trip AC circuit breaker or direct-current isolating switch this not only adds and be to remove fault current
System cost, improves the technical requirements to equipment, while also reducing system operational percentage, has slowed down fault recovery speed.
Adopt that manufacture difficulty is big, high cost direct current cables laying-out is to reduce DC Line Fault in engineering mostly at present
Raw rate, but can not be from the basic process Problem of Failure for solving semibridge system MMC inverter to DC Line Fault.In consideration of it, by changing
Stream device itself control realization fault current self-cleaning becomes a kind of most economical effective method, also causes to find with DC Line Fault
The inverter topology of ride-through capability becomes research tendency.
The inverter topology of DC Line Fault can be passed through at present two big class, and a class is based on IGBT tandem taps and full-bridge
The hybrid inverter topology of submodule series-parallel connection a, class is by new submodule topology, such as full-bridge submodule or clamper Shuangzi mould
The modularization multi-level converter topology of block cascade.Former structure is complicated, and control difficulty is high, is unfavorable for engineering construction.In the latter
In addition to DC Line Fault ride-through capability, also factor module negative voltage characteristic can improve DC voltage utilization rate to full-bridge submodular MMC,
So as to lift system capacity；Clamper Shuangzi modular MMC then has the device count less compared with full-bridge submodule, and economy is higher,
But compared to semibridge system MMC still in inferior position.Therefore, the MMC for being highly desirable to find class optimization is topological so as to have direct current concurrently
The advantages such as fault traversing function, high power capacity and low cost.
The content of the invention
It is an object of the invention to provide a kind of new mixing submodular MMC inverters topology, it passes through the locking change of current
Device is while with DC Line Fault ride-through capability, moreover it is possible to meet the requirement of system high power capacity and low cost.
For achieving the above object, the solution of the present invention includes：
Possess the mixing submodular MMC inverters of DC Line Fault ride-through capability, including three-phase totally six bridge arms, each bridge
Arm is by m semibridge system submodule (HBSM), n full-bridge type submodule (FBSM) and l clamper Shuangzi module (CDSM) level
Connection is constituted.
In known system active-power P, reactive power Q, total capacity S, DC voltage UdcAnd by device current stress
Bridge arm current I of restrictionarmUnder constraint etc. condition, electrical network phase voltage peak value (being converted to valve side) U is calculatedm=SUdc/
(3Iarm·Udc- P), and thus calculate system fully loaded modulation degree k when P, Q are fully exported；When k≤1, the configuration of full-bridge submodule number
For n=0；Work as k>When 1, full-bridge submodule number n=(k-1) Udc/2/Uc, wherein UcFor submodule electric capacity rated voltage；Consider
System overload ability and voltage ripple of power network scope.
M=Udc/Uc-2l。
Direct fault current self-cleaning and HBSM that High Level DC Voltage utilization rate, FBSM and CDSM with reference to FBSM has
Economic sexual clorminance, according to the actual requirements, selection is optimized to the number of m, n and l, be applied to can the inverter soft
Property DC transmission system, particularly require operational percentage during system dc failure higher occasion so as to possessing DC Line Fault
While ride-through capability, moreover it is possible to lift system capacity, Financial cost is saved.
Description of the drawings
Fig. 1 is mixing submodular MMC inverters and its submodule topology schematic diagram；
Fig. 2 (a), (b), (c) are respectively half-bridge submodule, full-bridge submodule, clamper Shuangzi module in direct fault current
Equivalent circuit during lower locking (arrow represents current direction, and thick lines represent current path)；
Fig. 3 (a), (b) are bridge arm voltage and DC voltage graph of a relation；
Fig. 4 is DC bipolar short-circuit current circuit diagram；
Fig. 5 is DC bipolar short-circuit simulation waveform；
Fig. 6 is mixing submodular MMC and half-bridge submodular MMC simulation comparison figures.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention will be further described in detail.
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is described in further detail.
Mixing submodular MMC inverters and its submodule topology are illustrated as shown in Figure 1.Inverter is adopted and half-bridge submodule
Block formula MMC identical structure, is still the bridge arm structure of three-phase six, but single bridge arm includes m semibridge system submodule, n full-bridge type
Submodule and l clamper Shuangzi module.
As shown in Fig. 1 Neutron modules topology, semibridge system submodule is by two IGBT/Diode components and a capacitor structure
Into full-bridge type submodule is made up of four IGBT/Diode components and a capacitor, and clamper Shuangzi module is by 4 IGBT/
Diode components, 1 guiding IGBT/Diode component, 2 diodes and two capacitors are constituted.By controlling IGBT/Diode
Component cut-offs, while control clamper Shuangzi module booting IGBT/Diode components turning on all the time, half-bridge submodule, full-bridge submodule
Block and clamper Shuangzi module can export respectively UcWith 0 two kinds of voltages, Uc, 0 and-UcThree kinds of voltages, and 2Uc、UcWith 0 three kinds
Voltage.Therefore two half-bridge sub-module cascades can be equivalent to when a clamper Shuangzi module is run, but compared with two half-bridge submodules
2 diodes and 1 guiding IGBT/Diode component have been used block more, it is relatively costly.Full-bridge submodular MMC is because submodule
Negative voltage characteristic, combined-voltage modulation ratio can be higher than 1, relative to equal DC voltage level half-bridge submodular MMC and
Clamper Shuangzi modular MMC, can lift transmission capacity by improving alternating voltage.
Fig. 2 sets forth equivalent circuit of three seed modules under direct fault current during locking.As seen from the figure, full-bridge
Submodule and clamper Shuangzi module can provide U in fault current loopcBack-emf, suppress fault current to zero so that
The inverter that two class submodules topology is constituted is respectively provided with DC Line Fault ride-through capability.
Therefore, by m half-bridge submodule, n full-bridge submodule and l clamper Shuangzi module in reasonable disposition bridge arm,
Inverter can be made while with DC Line Fault ride-through capability, moreover it is possible to lift system capacity, reduces cost.
Concrete submodule number collocation method is divided into following 4 step：
1, determine full-bridge submodule number n.In known system active-power P, reactive power Q, total capacity S, DC voltage
UdcAnd bridge arm current I limited by device current stressarmUnder constraint etc. condition, calculate electrical network phase voltage peak value and (be converted to
Valve side) Um=SUdc/(3Iarm·Udc- P), and thus calculate system fully loaded modulation degree k when P, Q are fully exported；When k≤1,
Full-bridge submodule number is configured to n=0, and it is just, without the need for full-bridge submodule that the bridge arm voltage as shown in Fig. 3 (a) is permanent；Work as k>When 1, entirely
Bridge submodule number n=(k-1) Udc/2/Uc, to ensure Fig. 3 (b) in dash area show negative part bridge arm voltage output；
Consider system overload ability and voltage ripple of power network scope, n values are taken should be as little as possible after appropriate allowance.
2, determine clamper Shuangzi number of modules l.DC bipolar short-circuit current loop as shown in Figure 4, only as 2 (n+l)
≥3UmWhen, the back-emf of two bridge arm submodule generations could be suppressed to AC system to the fault current that trouble point feeds
Zero, realize that DC Line Fault is passed through, therefore, chooseL values are as little as possible after appropriate nargin is considered, to subtract
The use of little IGBT device.
3, determine half-bridge submodule number m.As shown in figure 3, bridge arm voltage is (k+1) Udc/2 to the maximum, by m+n+2l electric capacity
Formed, therefore half-bridge submodule number m need to meet m=Udc/Uc- 2l, equivalent to m half-bridge submodule m/2 clamper is instead of
Shuangzi module, reduces derailing switch number of packages；
4, afterwards again to the appropriate redundancy of above-mentioned number consideration.
In order to verify it is of the present invention mixing submodular MMC inverters and its submodule number collocation method it is feasible
Property and effectiveness, the present embodiment establishes ± 160kV under MATLAB R2012b Simulink simulated environment, 100MW mixing
Modular MMC phantoms, bridge arm current Iarm300A is set to, system nominal submodule capacitor voltage is 20kV, thus obtains electricity
Net phase voltage peak value (being converted to valve side) is 170kV, and full-load voltage modulation ratio is 1.0935, therefore does not consider redundancy and allowance,
Calculate half-bridge, full-bridge and clamper Shuangzi number of modules and be respectively 2,1 and 7.
Fig. 5 gives DC current (lower section) and bridge arm current (top) waveform under DC bipolar short trouble, can see
Go out about 15ms DC currents drop zero after converter blocking, therefore designed mixing submodular MMC has reliable direct current event
Barrier ride-through capability.
Fig. 6 gives mixing submodular MMC inverters and has equal DC voltage level, equal maximum bridge arm current
And 0.85 unloaded modulation ratio the contrast of half-bridge submodular MMC outputs, it can be seen that by improving alternating voltage, mixing
Submodular MMC has the power output capacity higher than half-bridge submodular MMC.
In addition, replacing 1 clamper Shuangzi module, designed mixing submodular MMC to save by 2 half-bridge submodules
1 guiding IGBT/Diode component and 2 diodes, reduce cost, the Practical Project huge for submodule number, its Jing
Ji sexual clorminance will be more prominent.
To sum up, designed mixing submodular MMC has a reliable DC Line Fault ride-through capability, and can effective lifting system
System transmission capacity, while with relatively low loss, reducing system cost.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.The base of the present invention
This thinking is above-mentioned basic scheme, and for those of ordinary skill in the art, various changes are designed in teaching of the invention
The model of shape, formula, parameter simultaneously need not spend creative work.It is right without departing from the principles and spirit of the present invention
Change, modification, replacement and the modification that embodiment is carried out is still fallen within protection scope of the present invention.
Claims (3)
1. the mixing submodular MMC inverters of DC Line Fault ride-through capability are possessed, it is characterised in that including three-phase totally six bridges
Arm, each bridge arm is constituted by m semibridge system submodule, n full-bridge type submodule and l clamper Shuangzi module-cascade；
Known system active-power P, reactive power Q, total capacity S, DC voltage UdcAnd the bridge arm limited by device current stress
Electric current IarmUnder constraint etc. condition, electrical network phase voltage peak value U is calculatedm=SUdc/(3Iarm·Udc- P), and thus calculate P, Q
System fully loaded modulation degree k during output in full；When k≤1, full-bridge submodule number is configured to n=0；Work as k>When 1, full-bridge submodule
Number n=(k-1) Udc/2/Uc, wherein UcFor submodule electric capacity rated voltage；When the result of calculation of n is decimal, round up, n
For integer.
2. mixing submodular MMC inverters for possessing DC Line Fault ride-through capability according to claim 1, its feature exists
In,When the result of calculation of l is decimal, round up, l is integer.
3. mixing submodular MMC inverters for possessing DC Line Fault ride-through capability according to claim 2, its feature exists
In m=Udc/Uc-2l；When the result of calculation of m is decimal, round up, m is integer.
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| CN104320011B true CN104320011B (en) | 2017-04-19 |
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| CN104682751B (en) * | 2015-03-02 | 2017-07-25 | 上海交通大学 | Modularization based on PAM and PWM hybrid modulations cascades multilevel converter |
| CN105634259B (en) * | 2015-05-26 | 2019-04-19 | 华北电力大学 | A kind of fail-safe analysis and redundant configuration calculation method of mixing module multilevel converter |
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| CN105071425B (en) * | 2015-07-28 | 2017-08-25 | 国家电网公司 | A kind of Hybrid HVDC system based on LCC and MMC |
| CN105119508B (en) * | 2015-09-18 | 2017-09-22 | 山东建筑大学 | Full-bridge and the modularization multi-level converter and startup method of half-bridge submodule series-parallel connection |
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| CN105429496A (en) * | 2015-12-31 | 2016-03-23 | 北京四方继保自动化股份有限公司 | Modular multilevel converter with DC fault elimination function |
| CN105576691B (en) * | 2016-03-01 | 2018-07-03 | 西安许继电力电子技术有限公司 | Modularization multi-level converter DC Line Fault ride-through capability evaluation method and system |
| CN105763086B (en) * | 2016-04-07 | 2019-02-05 | 电子科技大学 | A kind of Pyatyi submodule capacitor voltage balance control method of modular multi-level converter |
| CN105914702A (en) * | 2016-05-18 | 2016-08-31 | 天津大学 | F-MMC type flexible DC transmission system fault reclosing method with low-current hazard |
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| CN106160545B (en) * | 2016-07-06 | 2018-12-11 | 清华大学 | A kind of bridge arm hybrid bipolar modular multi-level converter |
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| CN106411166A (en) * | 2016-11-15 | 2017-02-15 | 北京四方继保自动化股份有限公司 | Modular multi-level converter hybrid bridge arm topology structure |
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| CN109149621B (en) * | 2018-10-19 | 2024-01-26 | 哈尔滨工业大学（深圳） | Flexible direct current transmission device with fault ride-through capability and direct current transmission system |
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| CN110994560B (en) * | 2019-11-25 | 2020-11-20 | 上海交通大学 | Low-loss modular multilevel converter fault ride-through method |
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