CN104205607B - Modular electrical Source Converter - Google Patents
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- CN104205607B CN104205607B CN201180076027.3A CN201180076027A CN104205607B CN 104205607 B CN104205607 B CN 104205607B CN 201180076027 A CN201180076027 A CN 201180076027A CN 104205607 B CN104205607 B CN 104205607B
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Abstract
A kind of Modular electrical Source Converter (100) includes the multiple unit conformal with elementary cell design, at least two switch that the design of this elementary cell includes the first and second terminals, capacitor and employing half-bridge or full bridge configuration and arranges.In the converter, quantity n unit that first group is connected in series by the terminal at them (101 k, k=1 ... n) formed, and second group of equal quantity n unit being connected in series by the terminal at them (102 k, k=1 ... n) are formed.The terminal of the corresponding unit (102 k) that the terminal of unit (101 k) is connected in described second group via resistance or sensing connecting element (110 k) in described first group.
Description
Technical field
Invention disclosed herein relates generally to the field of power semiconductor arrangement.More accurately, it relates to Modular electrical Source Converter (VSC), and it includes series connection and/or the switch element being arranged in parallel, and wherein the quantity of these switch elements and configuration are variable to change VSC to meet different switching task.
Background technology
VSC is controllable voltage source, and wherein input is connected at least one capacitor, and it plays the effect of DC voltage source.At output, transducer is operable to form variable AC voltage.This realizes by using the switch in VSC to make the voltage of capacitor or multiple capacitor be directly connected to any one during transducer exports.In the transducer utilizing pulsewidth modulation (PWM), input D/C voltage generally remains constant when forming output voltage waveforms (it is averagely sinusoidal).The amplitude of AC voltage, frequency and phase place can control by changing switching mode.
As discussed in WO 2010/102666 A1, VSC can be formed by the converter unit being connected in series.This improves smoothing that the AC to constant switching frequency with for given filtering exports.Unit can be single-phase full bridge transducer, is typically called link units.Transducer based on chain link includes multiple unit module being connected in series, each unit except outside the Pass also include capacitor.In each phase, the quantity of the unit of series connection is proportional to the AC rated voltage of system and therefore can include a large amount of unit for high AC electrical voltage system.
In order to make the VSC of this general type be adapted to given AC rated current, two main method known in the art.One option is to be arranged in parallel the unit sequence being connected in series, and the most each sequence provides total current share in the case of without departing from the rated current of its own.Owing to the complexity of corresponding sequence is dynamic, need senior control to avoid the imbalance between Parallel Sequence.Another option is design link units, and its critical component bears the switching current of needs, wherein the copy of unit will switching voltage as required and be arranged in single sequence.In order to the VSC of gained meets rational quality expectations (especially in regard to energy efficiency), the method makes designer depart from the crag-fast situation about the range size providing battery types.In little scope, there are some unit and will be arranged in the application that they are not fully utilized but still occupy the big statistics definitiveness taken up room.Therefore, the cost for the VSC according to the method can unexpectedly change about the electrical power standing switch.On the other hand, big battery types scope must develop input, high manufacturing cost (such as, the quantity of common elements is the least) and the difficulty relevant with stock control in a large number.
Summary of the invention
The present invention is made in view of the restriction of prior art above.It is an object of the present invention to propose novel and favourable VSC design.Specific objective is to provide basic VSC design, and it easily adapts in the given switching task specified by such as rated current and/or rated voltage.Other specific objective is to provide adaptable VSC design, and it has stable cost-power relation.
Therefore, the present invention provides modularity VSC being such as defined in the independent claim and the method providing such modularity VSC.
According in modularity VSC of the present invention, unit is connected and is arranged in parallel in cell matrix.Being connected in series between unit terminal is embodied as connecting line, i.e. Low ESR transport element.It is connected in parallel the element of the electric current of flowing between the corresponding output by making dynamically or statically to limit the counter element in different group to connect and realize.Described connecting element can be sensing or resistance.Each connecting element can have resistance and inductance characteristics and/or different types of connecting element can be deployed in a single VSC.
Unit in VSC in all respects need not be identical, but is conformal for elementary cell design.Although the unit of arranged in series is not identical, the unit being arranged in parallel preferably has identical or almost identical quantity character, such as, characterize the numerical value of parts.Elementary cell designs especially regulation unit and includes the first and second terminals.If two unit in different groups they be arranged in the correspondence position in respective sets; be " corresponding " in the sense that claim.It is to say, unit is neighbours about the direction in parallel of cell matrix.If two terminals are all the first terminal in they corresponding units or are all the second terminals, it is " corresponding ".In symmetrical cell, the state as " first " and " second " terminal can determine about loop circuit；Conventionally, it is contemplated that in the unit with given serial number, the terminal with next relatively low serial number being connected to adjacent cells is " first ", or the terminal being most closely connected to given current rail is " first ".
Connect by the resistance between corresponding unit in parallel or sensing, the specified VSC of the switching task for needing can be designed and it assembles from unit (module) easily.VSC is the most adaptable about rated voltage and voltage.The quantity of parallel units (that is, corresponding unit in parallel) is relevant with the rated current of VSC, and often the length of the unit that group is connected in series is relevant with switching voltage.Therefore, if the rated voltage of unit is CUV and rated current are CIA, then include that the VSC specified switching voltage in principle of n series unit of m joint group will be n × CUV and specified switching current will be m × CIA.This is about resolution problem, i.e. in terms of rated value elementary cell design small and exquisite: the VSC of assembling will have the most closely with design requirement mate.If connecting element and non-resistive interconnection are out in the cold, total VSC cost is by proportional to the element number needed for approximation and therefore proportional with the product of the rated voltage needed and electric current.Therefore, at least one during the present invention meets its target.
Emphasize that the existence self of the some parallel units interconnected by connecting element does not represent the security risk bigger than individual unit.Really, the capacitor of different units will position in the case of lacking connecting element electrically in parallelly.In this case, the electric fault in unit will discharge the accumulation electric energy of the electric capacity sum corresponding to shnt capacitor.There is the VSC of these characteristics by needs structurally stalwartness.VSC equipped with the resistance according to the present invention or sensing interconnection element cannot stand this failure scenario.Therefore, single capacitor failure becomes the load of measuring in structure really, and the requirement about structure vigorousness can be loosened.This provides the weight of VSC, cost and the potential minimizing of size.This represents another advantage of the present invention.
Additionally, because connecting element even helps the electric current between corresponding unit, each unit will have the electric current of stable amplitude to total current contribution that exports of VSC.This is for service intervals that the cell life time is useful and expansible VSC.
Elementary cell design can include extra switch.Such as, it can include four switches using full bridge configuration to arrange, wherein unit can operate with opposite polarity in two conducted states.
The switch of elementary cell design can include semiconductor switch parts known per se, i.e. insulated gate bipolar transistor IGBT, it may be formed against leading igbt RC-IGBT, double mode gated transistor BIGT, gate turn-off thyristor GTO, integrated grid change transistor IGCT or mos field effect transistor MOSFET equipped with fly-wheel diode.Different types of switch can combine in unit designs.Equally, parts (realizing the switch of unit from it), discrepant unit can combine (assuming that they are conformal with elementary cell design) in modularity VSC.But, the most best option can be still the identical elementary cell design repeating in whole VSC in the same manner.
Advantageously, the also joint group of n unit is interconnected by n+1 connecting element so that the terminal of at least one corresponding unit that each terminal is connected in different group via connecting element.It is to say, the first and second terminals of unit both connect (possible, according to the accurate location of connecting element, via the terminal section of adjacent cells) terminal to other unit.
In one embodiment, VSC includes more than two and joint group, and the first terminal of all corresponding units in different group is interconnected by common connecting element.Such as, include ten unit each group of the VSC(with six and joint group) in, there are 11 connecting elements, each non-outer member and 12 unit outside it directly make electrical contact with.Alternatively, can arrange that group mode that uses into connects some connecting elements of terminal.
As the further development of embodiment (it includes common connecting element) above, common connecting element can be designed and install so that the layout of the unit structurally in reinforcing VSC.First, the optional material of each connecting element, shape, manufacture method and size obtain desirable engineering properties.As example, each connecting element can be straight, angled or the solid hopkinson bar of bending, and its material is high-resistance effectively to limit electric current, even if to have relatively large cross-sectional area the most such for bar.Secondly, the size of the optional terminal making common connecting element connect is so that the relative movement of limiting unit.3rd, terminal (or non-rotatably) can be attached to common connecting element rigidly, such as by weldering pricker, welding or by using the plug being suitable for.As the 4th option, the electric layout of optional unit to make connecting more than the element extended in a dimension, such as, plays the effect of the cross-bar making structure hardening.
In use, preferably operate for the purpose of the corresponding unit belonging to different group exports identical terminal voltage always according to the unit in the VSC of the present invention.Such as, if each unit comprises is configured to accept to express the high-level command of voltage to be provided by unit and for controlling switch and other subelement parts are to realize this logic possibly, then this can be implemented.Therefore, in normal operating, owing to component tolerance and analog, only weak current can flow through each connecting element, and energy dissipation is little.Connecting element mainly functions to when there is imbalance or unusual condition.
As to wherein output voltage being this situation alternative of the quantity controlled, the control signal identical or corresponding to inductive switch supply in corresponding unit, this is possible.It is to say, the copy putting on one group of control signal of the switch of a unit can be forwarded to its corresponding unit in other groups.Because only generating the individual control signal that quantity reduces, this simplifies the control of VSC.
As already noted, when VSC normal operating, the least electric current flows in each connecting element.This fact available is to use simple mode to detect unusual condition.Advantageously, VSC is equipped with the current sensor detecting whether that the electric current can not ignore flows in connecting element.This current sensor can be the shunt being connected in series, the potentiometer connected at two points in connecting element, the comparator or the induction instrument aratus that are arranged to detect the voltage across element.Current sensor can be configured to the electric current with the intensity beyond predetermined threshold in response to detection and sends disablement signal.In including the VSC more than two unit groups, some current sensors may be arranged at the connecting element between the corresponding unit in identical group.Because the starting and ending point of given electric current can use this setting to determine with bigger accuracy, making the quantity of the possible position of out of order unit reduce, this is possible.
Anomaly unit can be by monitoring that the electric current in the connecting element that unit is connected flows or by relying on other diagnostic metrics (disablement signal such as, unit self sent) to position.In this situation, corresponding unit uses no-voltage pattern to operate.The unit recalling correspondence is any unit connected between two continuously coupled elements that out of order unit is identical.As in WO 2010/102666 A1 in greater detail, such no-voltage pattern can include by maintain on its terminal zero potential difference and walk around out of order unit.But, the normal switch operation of VSC continues in maximum possible degree.Elapsing over time, unless no-voltage Schema control realizes its expected structure ideally, the most out of order unit can develop into electricity completely to interrupt, and need not be further continued for no-voltage pattern at this point.
The method aspect of the present invention can be embodied as computer-readable instruction, and it is stored or distributed on computer-readable medium being formed computer program.
Note the present invention relates to all combinations of feature, even if enumerating the most such in mutually different claim.
Accompanying drawing explanation
Embodiments of the invention describe referring now to accompanying drawing, wherein:
Fig. 1,3 and 5 illustrate modularity VSC according to an embodiment of the invention；
Fig. 2 explains the unit symbol used in Fig. 1,3 and 5；And
Fig. 4 is the simplified electrical circuit diagram of the intended application of the diagram present invention.
All figures are schematically and normally only to illustrate to illustrate part essential to the invention, and other parts can be omitted or be only proposed.Unless otherwise instructed, similar label refers to the like in different figure.
Detailed description of the invention
Fig. 1 is the circuit diagram of modularity VSC 100 according to the first embodiment of the present invention.This VSC 100 includes first group n unit 101-1,101-2,101-3 ... 101-n, second group n unit 102-1,102-2,102-3 ... 102-n, the 3rd group of n unit 103-1,103-2,103-3 ... 103-n and the 4th group of n unit 104-1,104-2,104-3 ... 104-n.In this embodiment, it is provided that have left converter output terminals (or rail) 181,182,183,184 and right converter output terminals (or rail) 191,192,193,194.Therefore, these groups are the most electrically in parallel in a meaning, but only via current limliting connecting element.In each unit group, the terminal series-shunt of unit connects.Additionally, group is by n+1 connecting element 110-1,110-2 ... 110-(n+1) and interconnect.In the first embodiment described in FIG, each connecting element 110-k is shown as some resistors, and it carries identical label and makes the terminal belonging to the corresponding unit of different groups to connection.Use term introduced above, there is n group corresponding unit, i.e. 101-k, 102-k, 103-k and 104-k, arbitrary integer k are in interval [1, n].
If cells rated voltage has the order of magnitude of about 1 to 5kV, the resistance (or resistance component of impedance) of each connecting element not should be greater than approximating 1 Ω, and the most hundreds of m Ω.Have the unit of more high voltage-rated can use have relatively more low-resistance connecting element and interconnect, and vice versa.Other design rule can be formulated as above supplementary or alternative, i.e. the resistance invariant to be passed through of each connecting element and relevant with the resistance difference produced by the tolerance in corresponding unit.Such as, if the resistance of two corresponding units stands the ± tolerance of 5m Ω, then resistance can at most differ the resistance of the one or more connecting elements between 10m Ω, and these unit and can be set to the value of 10 or 100 times that are this resistance difference, i.e. 100m Ω or 1 Ω.
Fig. 2 illustrates three possible implications of the unit symbol used in FIG, i.e. the unit drawn according to elementary cell design 200 signal.First, with reference to the top of figure, unit can be embodied as half-bridge (or CTL), and wherein capacitor 240 is connected to the first and second terminals 201,202 via switch 221,222.Here, switch 221,222 is embodied as RC-IGBT, and its conducted state can control by applying applicable gate voltage at gate terminal 231,232.Typically, gate voltage is produced by grid unit, and this grid unit (or gate control device) the most for simplicity omits from figure.
Secondly, Fig. 2 illustrates such unit, they four switches 221,222,223,224 including using full-bridge (or H bridge or chain link) configuration and connecting.Full-bridge circuit includes capacitor 240.
3rd, with reference to the bottom of Fig. 2, unit can include one or more BIGT, and it plays the effect of switch 221,222.In addition to this difference, upper and lower half-bridge cells shown in figure 2 can cannot distinguish between from the angle of electricity.
On the whole with reference to Fig. 2, those noting the terminal 201,202 with symbol and side circuit 200 are consistent.In the VSC assembled, it defers to this: can be consistent, as illustrated in fig. 1 with second terminal 202 of adjacent cells 101-k in identical group to the first terminal 201 of cell 101-(k+1).Alternatively, in the case of common connecting element provides between corresponding unit, the element of the structure independence that the first and second terminals of adjacent cells can also be arranged on every side of connecting element, as illustrated in Figure 5.
With reference now to Fig. 3, similar to Fig. 1, modularity VSC according to the second embodiment of the present invention includes two groups of 101-k, 102-k(k=1 ... .n) n unit and converter output terminals 181,182,191,192.With current sensor 130-k(k=1 ... .n+1) each junction point of connecting between 110-k adjacent cells from first group of the resistance of arranged in series expands to the corresponding junction point in second group.Alternative as the ammeter 130-k being connected in series, big electric current can connect the voltage of 110-k across each resistance advantageous by monitoring and indirectly measure.Controller 120 is responsible for promoting unit to switch at suitable time point, in order to obtain desired output waveform at converter output terminals 181,182,191,192.Such as indicated by the dotted line on figure, controller 120 1 aspect is each by measured by each reception from current sensor 130-k to unit supply control signal and another aspect and be communicably connected in unit.This allows controller 120 detect out of order unit and take suitable action, described above.Notice that the operation of one or more out of order unit is by some in dissipation input power.Therefore, not damaging the safety during temporary faulty condition to meet given demanded power output, arrange for a certain power redundancy on the input side of VSC, this is wise.
VSC according to the present invention is adaptable to as the part of AC power distribution network or is used together together with it.Especially, VSC can be used in the future the most from childhood with in the feeding power of medium sized factory to commercial power grid.Therefore, even if adaptability is the outstanding advantage of the present invention, main expection provides VSC to the switching voltage in the range of 1kV to hundreds of kV.In order to only illustrate purpose, Fig. 4 illustrates that three-phase VSC arranges, wherein the converter output terminals 181,191 of three VSC unit 100 is in series using phase place L1 of delta configuration with corresponding sensing element, is being connected between L2, L3.
VSC 100 according to the 3rd embodiment that figure 5 illustrates illustrates potential structural benefit provided by the present invention.In this embodiment, 4 × 4 layouts of unit are formed by five insertion connecting elements 110-1,110-2,110-3,110-4, the 110-5 using rigidity conductive bar form to provide.Connecting element extends between the insulating bar 171,172 extending transverse to transport element.Six non-rotatable joints are in rod 171,172 and connecting element 110-1, formation between 110-2,110-3,110-4,110-5.
Possible alternative as the structure that figure 5 illustrates, non-rotatable joint can be replaced by But rotary joint such that it is able to transmits compression and/or tension force but is not the most torque.But, the shearing rigidity enough in order to give structure in the plane of figure, add the one or more pillars across the extension of structure deflection or frenulum (not shown), this is possible.If the element electric insulation added or be made up of insulant, they can directly connection at the point in connecting element.
The size of each bar 110-k can relate generally to desired engineering properties (rigidity of structure such as needed and/or ductility) and select, in order to stand it is contemplated that in short circuit event occur mechanical stress.Once the cross-sectional area of bar is determined, selects its material so that the resistance of gained has the value being deemed appropriate to purpose.More accurately, the dynamic electric character that unit is arranged can access by calculating and simulate and can form the basis for finding such resistance, and at this resistance, interconnection allows electricity imbalance impartial by the time constant being suitable for when they are suitably limited between counter element any electric current of flowing.If using high-resistivity alloy (such as, Nichrome, Kanthal, Chromel or bulk ceramic material), then can meet this design requirement.Other metals or the nonmetal high resistivity material that are adapted in high-voltage resistor use generally it is expected to be suitable for manufacturing the connecting element according to the present invention.
Even if the present invention describes by reference to its certain illustrated embodiment, many different changes and amendment will become obvious for those skilled in that art after studying this description.Therefore the embodiment described is not intended to limit the scope of the present invention, and it is only limited by the claim enclosed.Such as, VSC can be formed by using 16 × 1,8 × 2,4 × 3,4 × 4 configurations to carry out arrangement unit without departing from the scope of the present invention.
Claims (15)
1. a Modular electrical Source Converter (100), including:
Multiple unit, it is conformal with elementary cell design (200), described elementary cell design (200) include the first and second terminals (201,202), capacitor (240) and use half-bridge configuration and arrange first switch (221) and second switch (222), wherein:
(101-k, k=1 ... n) are formed first group of described unit of quantity n being connected in series by the terminal at them；And
The described unit of second group of equal quantity n being connected in series by the terminal at them (102-k, k=1 ... n) are formed,
Described in wherein said first group, the terminal of unit (101-k) is via current limliting connecting element (110-k, 110-(k+1)) and the terminal of corresponding unit (102-k) that is connected in described second group, make unit described in described first group in parallel with the described corresponding unit in described second group, and being connected in series between described unit is embodied as Low ESR transport element.
2. Modular electrical Source Converter as claimed in claim 1, the design of wherein said elementary cell farther includes the 3rd switch and the 4th switch, and described first switch, described second switch, described 3rd switch and described 4th switch use full bridge configuration to arrange.
3. Modular electrical Source Converter as claimed in claim 1 or 2, at least one in wherein said connecting element is resistive element.
4. Modular electrical Source Converter as claimed in claim 1 or 2, at least one in wherein said connecting element is sensing element.
5. Modular electrical Source Converter as claimed in claim 1 or 2, wherein said connecting element is adapted to structurally reinforce described transducer.
6. Modular electrical Source Converter as claimed in claim 4, wherein said connecting element is to have the bar of high resistivity material.
7. the Modular electrical Source Converter as described in claim 1,2 or 6, the corresponding unit in parallel wherein belonging to different group uses the identical such mode of moment terminal voltage of offer to operate.
8. the Modular electrical Source Converter as described in claim 1,2 or 6, farther including the controller (120) of conducted state for controlling the switch in described unit, what wherein said controller was configured to the corresponding unit in parallel by belonging to different group is arranged to common conductive state to inductive switch.
9. the Modular electrical Source Converter as described in claim 1,2 or 6, farther includes to be arranged to sensing at least one current sensor (130-k, k=1 ... n-1) of the electric current of flowing in described connecting element.
10. the Modular electrical Source Converter as described in claim 1,2 or 6, wherein:
(103-k, 104-k, k=1 ... n) are formed equal quantity n the unit that at least one other group (103,104) is connected in series by the terminal at them；And
Described at least one other group described, the terminal of unit is connected to the terminal of corresponding unit in described second group via other current limliting connecting element, make unit described at least one other group (103,104) described in parallel with corresponding unit (102-k) in described first and second groups.
The 11. Modular electrical Source Converter as described in claim 1,2 or 6, wherein said elementary cell design in switch be following in one:
Insulated gate bipolar transistor IGBT；
Against leading igbt RC-IGBT；
Double mode gated transistor BIGT；
Gate turn-off thyristor GTO；
Integrated grid change transistor IGCT；
Mos field effect transistor MOSFET.
Method in 12. 1 kinds of Modular electrical Source Converter (100), comprises the following steps:
Repeating elementary cell design (200), it includes the first and second terminals (201,202), capacitor (240) and employing half-bridge configuration and two switches (221 of arranging, 222) or use full bridge configuration and four switches (221,222,223 of arranging, 224), multiple unit is provided；
(101-k, k=1 ... n) are connected in series at their terminal and form first group (101) to make quantity n described unit；
(102-k, k=1 ... n) are connected in series at their terminal and form second group (102) to make equal quantity n described unit；And
The terminal making unit (101-k) described in described first group uses current limliting connecting element (110-k) to be parallel-connected to the terminal of corresponding unit (102-k),
Quantity n unit in the most each group selects according to specified switching voltage and being connected in series between described unit terminal is embodied as Low ESR transport element.
13. methods as claimed in claim 12, further include steps of
I) (103-k, 104-k, k=1 ... n) are connected in series and form other group (103,104) to make equal quantity n unit；
Ii) by described other group (103,104) terminal of unit described in is connected to the terminal of corresponding unit in previous group via other current limliting connecting element, make unit described in described other group (103,104) in parallel with corresponding unit (102-k) in all groups before；And
Repeating step i) and ii) until providing quantity m joint group, wherein said quantity m joint group select according to specified switching current.
14. methods as described in claim 12 or 13, further include steps of
Using this sample loading mode of the moment terminal voltage operation providing identical at each terminal in described unit to belong to the corresponding unit of different group, the terminal of wherein said unit interconnects via described connecting element；
Sensing flows through the electric current of described connecting element and in response to exceeding the electric current of threshold value to detect unusual condition.
15. methods as described in claim 12 or 13, farther include in response to it has been determined that the following steps of unusual condition:
Position at least one out of order unit；And
The operation of no-voltage pattern is used corresponding to described out of order unit and to belong to different those unit organized.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2011/074288 WO2013097906A1 (en) | 2011-12-30 | 2011-12-30 | Modular voltage source converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104205607A CN104205607A (en) | 2014-12-10 |
| CN104205607B true CN104205607B (en) | 2016-11-30 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3741595C1 (en) * | 1987-12-08 | 1989-07-06 | Magnet Motor Gmbh | Converter |
| EP1113570A1 (en) * | 1999-12-28 | 2001-07-04 | Electric Boat Corporation | Modular transformer for use with multi-level power converter |
| CN101548454A (en) * | 2006-09-06 | 2009-09-30 | 北方电力***公司 | Multiphase power converters and multiphase power converting methods |
| CN102067430A (en) * | 2008-05-07 | 2011-05-18 | Abb技术有限公司 | A voltage source converter |
| CN102077454A (en) * | 2008-06-27 | 2011-05-25 | Abb研究有限公司 | Battery energy source arrangement and voltage source converter system |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3741595C1 (en) * | 1987-12-08 | 1989-07-06 | Magnet Motor Gmbh | Converter |
| EP1113570A1 (en) * | 1999-12-28 | 2001-07-04 | Electric Boat Corporation | Modular transformer for use with multi-level power converter |
| CN101548454A (en) * | 2006-09-06 | 2009-09-30 | 北方电力***公司 | Multiphase power converters and multiphase power converting methods |
| CN102067430A (en) * | 2008-05-07 | 2011-05-18 | Abb技术有限公司 | A voltage source converter |
| CN102077454A (en) * | 2008-06-27 | 2011-05-25 | Abb研究有限公司 | Battery energy source arrangement and voltage source converter system |
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