CN107026577B - Modular multilevel converter capable of cutting off direct-current short-circuit fault current - Google Patents
Modular multilevel converter capable of cutting off direct-current short-circuit fault current Download PDFInfo
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- CN107026577B CN107026577B CN201710266790.1A CN201710266790A CN107026577B CN 107026577 B CN107026577 B CN 107026577B CN 201710266790 A CN201710266790 A CN 201710266790A CN 107026577 B CN107026577 B CN 107026577B
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 35
- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 239000004065 semiconductor Substances 0.000 claims description 31
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 claims description 11
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 claims description 11
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 claims description 11
- 101150105073 SCR1 gene Proteins 0.000 claims description 11
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 claims description 11
- 230000002459 sustained effect Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000009194 climbing Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 230000002000 scavenging effect Effects 0.000 description 1
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
- H02M7/145—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 thyratron or thyristor type requiring extinguishing means
- H02M7/155—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/162—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- 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
- H02M7/145—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 thyratron or thyristor type requiring extinguishing means
- H02M7/155—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/1552—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 thyratron or thyristor type requiring extinguishing means using semiconductor devices only in a biphase or polyphase arrangement
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
Abstract
The invention relates to a modular multilevel converter capable of cutting off direct-current short-circuit fault current, and belongs to the technical field of power electronic power conversion. The three upper converter bridge arms are connected together with the anode of the energy absorption branch thyristor and one end of the fast mechanical switch, the other end of the fast mechanical switch is connected with one end of the auxiliary electronic switch, the other end of the auxiliary electronic switch is used as the direct current positive end of the converter, the three lower converter bridge arms are connected together with the cathode of the energy absorption capacitor and the cathode of the freewheeling diode and are used as the direct current negative end of the converter, each bridge arm is formed by connecting a plurality of identical power modules in series, and the alternating current port of each power unit is connected in parallel with one group of bidirectional bypass thyristors. The modular multilevel converter capable of cutting off the direct-current short-circuit fault current can enable the modular multilevel converter to have the capability of cutting off the direct-current fault current through a simple quick mechanical switch and an energy absorption circuit.
Description
Technical field
The present invention relates to a kind of modularization multi-level converters of cut-off direct-current short circuit fault current, belong to power electronics
Power conversion technology field.
Background technique
Flexible DC transmission has become the novel electric power transmission mode being most potential at present.Since modular multilevel changes
Flowing device has public direct-current end, and has that Yi Tuozhan, active reactive can decoupling control, harmonic characterisitic be outstanding, switching device loss is small
The features such as, it is very suitable for flexible HVDC transmission system.But in the case where short trouble occurs for DC line, modularization
Multilevel converter will generate a uncontrollable rectifier device effect, using the modularization multi-level converter of conventional half bridge power module
Oneself direct-current short circuit fault current can not be removed, this to be restricted in engineering using direct current overhead line.
A kind of settling mode is the topological structure for improving the power module of modularization multi-level converter.Such as in half-bridge function
Topological structure improvement is carried out on the basis of rate module, by increasing additional semiconductor switch device and two poles in power module
Tube device blocks direct-current short circuit fault current, makes it have the ability for blocking direct-current short circuit fault current.Full-bridge can also be used
Power module makes direct-current short circuit fault current flow through power module capacitor, blocks fault current by power module capacitance voltage
Access.But increased semiconductor switch device required for this scheme for improving power module is more, can bring bigger
The increase of cost.On the other hand, normal operating current can flow through the increased semiconductor switch device of institute, this leads to inverter again
On-state loss increase, be greatly lowered the efficiency of device.
Another kind of mode is to install dc circuit breaker additional.Current high voltage DC breaker includes mechanical breaker, is based on
The schemes such as the solid circuit breaker of pure power electronic devices and the hybrid circuit breaker combined based on the two.DC solid circuit breaker
Main through-flow branch routing semiconductor switch is constituted, and normal operating current all flows through semiconductor switch device, this causes solid-state breaking
The power loss of device is larger.The mechanical through-flow branch routing high speed machine switch of dc circuit breaker master is constituted, and transfer branch routing is reversed
Current injection circuit is constituted, and for injecting reverse current when turning off DC current, realizes high-speed switch blow-out.Mechanical direct current
Breaker is also faced with high di/dt switch off current reliability, series connection multi-break synchronism and switch off time one in high pressure field application
The problems such as cause property.The hybrid through-flow branch routing high speed machine switch of dc circuit breaker master is constituted with auxiliary converter circuit, transfer branch
It routes semiconductor switch to constitute, normal operating current flows through main through-flow branch, and electric current is transferred to by semiconductor switch structure when cut-offfing
At transfer branch, by semiconductor switch cut-off current, this can take into account on-state loss characteristic and quick breaking characteristics.But it is mixed
Dc circuit breaker is closed due to there are electric current transfer time, generally requiring by installing biggish direct current reactor fault current limiting additional
Climbing, since the rising of fault current causes the fault current of shutdown needed for semiconductor switch also larger.Therefore mixed DC
Breaker there is also installation costs at present it is high, volume is big the disadvantages of, and can drop-out current also by Turn-off semiconductor device
Limitation.On the whole, the technical maturity of high voltage DC breaker is not also high at present, and cost and volume are yet all bigger.
Summary of the invention
The purpose of the present invention is do not have direct-current short circuit fault current for current semi-bridge type modularization multi-level converter
Scavenging activity, increase of the power module improved modular multilevel converter in terms of cost and loss is bigger, and high pressure
Dc circuit breaker there is also technical maturities it is low, cost and volume are big the disadvantages of, propose a kind of cut-off direct-current short circuit failure electricity
The modularization multi-level converter of stream bypasses turn on thyristors limit by triggering power module when direct-current short circuit failure occurs
Energy Absorption Capacitance branch is put by triggering and conducting energy absorption branch thyristor, is assisted by shutdown by DC voltage processed
Electronic switch, which forces direct-current short circuit fault current, to be transferred in energy absorption capacitor and freewheeling diode and rapid decay is to zero,
It cut-offs Fast mechanical switch under zero current and no-voltage, realizes the cutting of direct fault current.
The modularization multi-level converter of cut-off direct-current short circuit fault current proposed by the present invention, including three upper changes of current
2, two groups of three filter reactors 3 of bridge arm 1, three lower change of current bridge arm, energy absorption bypass thyristor TB, energy absorption capacitor
CB, Fast mechanical switch KM, auxiliary electron switch SM, sustained diode F；Three cathode of the upper change of current bridge arm of described three
End is connected respectively to one end of first group of three filter reactors LA1, LB1, LC1, and three of the lower change of current bridge arm of described three
Positive terminal is connected respectively to one end of second group of three filter reactors LA2, LB2, LC2, first group of three filter reactor
The other end of LA1, LB1, LC1 are connected to and can cut with the other end of second group of three filter reactors LA2, LB2, LC2 respectively
Three-phase alternating current phase line end A, B, C of the modularization multi-level converter of disconnected direct-current short circuit fault current, three lower change of current bridge arms
The cathode that negative pole end connects together afterwards with the cathode of energy absorption capacitor CB, sustained diode F is connected to cut-off direct current
The direct current negative pole end DC- of the modularization multi-level converter of short-circuit current, the positive terminal of three upper change of current bridge arms are connected to
It is connect after together with one end of the anode of energy absorption bypass thyristor TB, Fast mechanical switch KM；Energy absorption bypasses brilliant lock
The cathode of pipe TB is connect with the CB anode of energy absorption capacitor；The other end of Fast mechanical switch KM is with auxiliary electron switch SM's
One end connection, the other end of auxiliary electron switch SM is as the straight of the modularization multi-level converter that direct-current short circuit electric current can be cut off
Flow positive terminal DC+.
In the modularization multi-level converter of above-mentioned cut-off direct-current short circuit fault current, the upper change of current bridge arm is under
The structure of change of current bridge arm is identical, and each change of current bridge arm, using being connected in series, forms change of current bridge arm by multiple identical power modules
A positive terminal and a negative pole end.
In the modularization multi-level converter of above-mentioned cut-off direct-current short circuit fault current, the power module is by first
Semiconductor switch S1, the second semiconductor switch S2, first diode D1, the second diode D2, DC capacitor CD, the first bypass are brilliant
Brake tube SCR1, the second bypass thyristor SCR2 composition；The emitter of the first semiconductor switch S1, first diode D1
Anode, the collector of the second semiconductor switch S2, the cathode of the second diode D2, the anode of the first bypass thyristor SCR1, the
The SCR2 cathode of two bypass thyristors constitutes the first terminal T1 of power module after being connected with each other；First semiconductor switch
The anode of the collector of S1, the cathode of first diode D1 and DC capacitor CD is connected with each other；Second semiconductor switch
The emitter of S2, the anode of the second diode D2, the cathode of DC capacitor CD, the cathode of the first bypass thyristor SCR1, second
The anode of bypass thyristor SCR2 is interconnected to constitute the Second terminal T2 of power module.
The modularization multi-level converter of cut-off direct-current short circuit fault current proposed by the present invention, its advantage is that:
The modularization multi-level converter of cut-off direct-current short circuit fault current proposed by the present invention, by direct-current short circuit failure
Electric current is forced and is transferred in energy absorption capacitor and freewheeling diode, opens Fast mechanical switch under zero current and no-voltage
It is disconnected, realize the cutting of direct fault current, the ability for making modularization multi-level converter itself have cutting direct fault current.
For existing mixed high-voltage dc circuit breaker scheme, the transfer branch being made of semiconductor device switch is to cut-off fault current
Core and the highest part of cost.Modularization multi-level converter through the invention, it may not be necessary to by partly leading
The transfer branch that body devices switch is constituted, it is only necessary to simple Fast mechanical switch and energy absorption circuit.In addition, passing through
The voltage and direct-current short circuit of inverter DC port during the bidirectional thyristor bypass limitation direct-current short circuit failure of power module
The rate of climb of fault current can also be avoided using direct current current-limiting reactor needed for conventional high-pressure dc circuit breaker scheme.
Modularization multi-level converter through the invention, can be by modularization multi-level converter function and dc circuit breaker function knot
It is combined, and the cost and land occupation of device greatly reduces.
Detailed description of the invention
Fig. 1 is the circuit theory of the modularization multi-level converter of cut-off direct-current short circuit fault current proposed by the present invention
Figure.
Fig. 2 is upper change of current bridge arm and lower change of current bridge arm circuit diagram in modularization multi-level converter shown in FIG. 1.
Fig. 3 is the circuit diagram of the power module of upper change of current bridge arm shown in Fig. 2 and lower change of current bridge arm circuit.
Fig. 4 is the DC current path schematic diagram of modularization multi-level converter of the invention when operating normally.
Fig. 5 is the direct-current short circuit failure electricity that the moment occurs in direct-current short circuit failure for modularization multi-level converter of the invention
Logical circulation road schematic diagram.
Fig. 6 is the current path schematic diagram that direct-current short circuit fault current is transferred to energy absorption capacitor and freewheeling diode.
Specific embodiment
The modularization multi-level converter of cut-off direct-current short circuit fault current proposed by the present invention, circuit diagram is such as
Shown in Fig. 1, including three upper 2, two groups of three filter reactors 3 of the lower change of current bridge arm of change of current bridge arm 1, three, energy absorption bypass
Thyristor TB, energy absorption capacitor CB, Fast mechanical switch KM, auxiliary electron switch SM, sustained diode F；Described three
Three negative pole ends of upper change of current bridge arm are connected respectively to one end of first group of three filter reactors LA1, LB1, LC1, described
Three positive terminals of three lower change of current bridge arms are connected respectively to one end of second group of three filter reactors LA2, LB2, LC2, the
The other end of one group of three filter reactors LA1, LB1, LC1 respectively with second group of three filter reactors LA2, LB2, LC2
The other end be connected to the modularization multi-level converter of cut-off direct-current short circuit fault current three-phase alternating current phase line end A, B,
C, the negative pole end of three lower change of current bridge arms connect together the cathode with the cathode of energy absorption capacitor CB, sustained diode F afterwards
It is connected to the direct current negative pole end DC- of the modularization multi-level converter of cut-off direct-current short circuit fault current, three upper changes of current
One end that the positive terminal of bridge arm connects together afterwards with the anode of energy absorption bypass thyristor TB, Fast mechanical switch KM connects
It connects；The cathode of energy absorption bypass thyristor TB is connect with the CB anode of energy absorption capacitor；Fast mechanical switch KM's is another
End is connect with one end of auxiliary electron switch SM, mould of the other end of auxiliary electron switch SM as cut-off direct-current short circuit electric current
The direct-flow positive pole end DC+ of block multilevel converter.
Upper change of current bridge arm and the lower change of current in the modularization multi-level converter of above-mentioned cut-off direct-current short circuit fault current
The structure of bridge arm is identical, is connected in series as shown in Fig. 2, each change of current bridge arm is used by multiple identical power modules, formation is changed
Flow the positive terminal and a negative pole end of bridge arm.The circuit diagram of the power module by the first half as shown in figure 3, led
Body switch S1, the second semiconductor switch S2, first diode D1, the second diode D2, DC capacitor CD, the first bypass thyristor
SCR1, the second bypass thyristor SCR2 composition；The sun of the emitter of the first semiconductor switch S1, first diode D1
Pole, the collector of the second semiconductor switch S2, the cathode of the second diode D2, the anode of the first bypass thyristor SCR1, second
The SCR2 cathode of bypass thyristor constitutes the first terminal T1 of power module after being connected with each other；The first semiconductor switch S1
Collector, first diode D1 cathode and DC capacitor CD anode be connected with each other；The second semiconductor switch S2
Emitter, the anode of the second diode D2, the cathode of DC capacitor CD, the cathode of the first bypass thyristor SCR1, by second
The anode of road thyristor SCR2 is interconnected to constitute the Second terminal T2 of power module.
Below in conjunction with attached drawing, the working principle of the invention and the course of work is discussed in detail.When operating normally, change of current bridge arm
First bypass thyristor SCR1 and the second thyristor SCR2 of each power module all in off state, in power module first
Semiconductor switch S1 and the second semiconductor switch S2 is in normal burst switch state, and modularization multi-level converter operates normally
With output DC voltage.As shown in figure 4, Fast mechanical switch KM and auxiliary electron switch SM is all in closed form when operating normally
State, the average anode current of inverter flow through Fast mechanical switch KM and auxiliary electron switch SM.When short circuit occurs for DC line
When failure, the modularization multi-level converter of cut-off direct-current short circuit fault current of the invention cuts off direct current in accordance with the following steps
Fault current:
1) when short trouble occurs for DC line, direct-current short circuit fault current is begun to ramp up.When detecting direct-current short circuit therefore
When barrier electric current is excessive, it is latched the pulse signal of all power modules immediately, makes the semiconductor switch S1 and S2 of all power modules
All in off state.Trigger bypass thyristor switch SCR1 and the SCR2 conducting of all power modules immediately simultaneously.Each power
After the bypass turn on thyristors of module, the equivalent circuit of inverter is as shown in Figure 5.Since power module bypass thyristor switch is complete
Portion's conducting, is equivalent to three-phase alternating-current supply by direct short-circuit at this time, eliminates the uncontrollable rectifier effect of inverter, be applied to direct current
Voltage on route also becomes close to zero, and direct fault current is made to stop rising.
2) triggering and conducting energy absorption branch thyristor TB is then powered off auxiliary electron switch SM, forces direct-current short circuit event
Barrier electric current shifts.As shown in fig. 6, the direct-current short circuit fault current of inverter side will after auxiliary electron switch SM shutdown
It is forced to be transferred in energy absorption branch, be charged by energy absorption branch thyristor TB to energy absorption capacitor CB；Direct current
The fault current in line side will be forced to be transferred in sustained diode F.
3) after direct fault current is transferred completely into energy absorption capacitor CB and sustained diode F, Fast mechanical switch
It is turned off under near zero voltage and zero current.
4) direct fault current of inverter side charges to energy absorption capacitor CB, and electric current rapid decay to zero works as electric current
Energy absorption branch thyristor TB is turned off naturally when zero passage.
5) the gate pole trigger signal for removing power module bypass thyristor bypasses thyristor in bridge arm current zero crossing and closes
It is disconnected.After the bypass thyristor of all power modules is turned off, inverter is restored to structure when normal operation.
6) fault current of AC line trackside flows through freewheeling diode and rapid decay is to zero, and DC line short dot is natural
Arc extinguishing is restored to normal condition after cutting off DC line short dot, is finally completed the cutting of direct-current short circuit fault current.
The modularization multi-level converter of cut-off direct-current short circuit fault current proposed by the present invention, by by power module
Bypass IGBT group conducting limitation direct-current short circuit failure during inverter DC port voltage and direct-current short circuit failure
The climbing of electric current absorbs direct-current short circuit fault current by energy absorption capacitor and freewheeling diode, makes Fast mechanical switch
It is cut-off under zero current and no-voltage, realizes the cutting of direct-current short circuit fault current.It is changed compared to conventional modular multilevel
Device is flowed, modularization multi-level converter of the invention itself has the ability of cutting direct fault current.Compared to high voltage direct current
Breaker scheme, modularization multi-level converter of the invention can greatly reduce the cost and land occupation of device.
Claims (1)
1. a kind of modularization multi-level converter of cut-off direct-current short circuit fault current, which is characterized in that how electric the modularization is
Flat inverter includes three upper 2, two groups of three filter reactors 3 of the lower change of current bridge arm of change of current bridge arm 1, three, energy absorption bypass
Thyristor TB, energy absorption capacitor CB, Fast mechanical switch KM, auxiliary electron switch SM, sustained diode F；Described three
Three negative pole ends of upper change of current bridge arm are connected respectively to one end of first group of three filter reactors LA1, LB1, LC1, described
Three positive terminals of three lower change of current bridge arms are connected respectively to one end of second group of three filter reactors LA2, LB2, LC2, the
The other end of one group of three filter reactors LA1, LB1, LC1 respectively with second group of three filter reactors LA2, LB2, LC2
The other end be connected to the modularization multi-level converter of cut-off direct-current short circuit fault current three-phase alternating current phase line end A, B,
C, the negative pole end of three lower change of current bridge arms connect together the anode with the cathode of energy absorption capacitor CB, sustained diode F afterwards
It is connected to the direct current negative pole end DC- of the modularization multi-level converter of cut-off direct-current short circuit fault current, three upper changes of current
One end that the positive terminal of bridge arm connects together afterwards with the anode of energy absorption bypass thyristor TB, Fast mechanical switch KM connects
It connects；The cathode of energy absorption bypass thyristor TB is connect with the CB anode of energy absorption capacitor；Fast mechanical switch KM's is another
End is connect with one end of auxiliary electron switch SM, mould of the other end of auxiliary electron switch SM as cut-off direct-current short circuit electric current
The direct-flow positive pole end DC+ of block multilevel converter；Wherein the upper change of current bridge arm is identical with the structure of lower change of current bridge arm, often
A change of current bridge arm, using being connected in series, forms the positive terminal and a cathode of change of current bridge arm by multiple identical power modules
End；Wherein the power module is by the first semiconductor switch S1, the second semiconductor switch S2, first diode D1, the two or two
Pole pipe D2, DC capacitor CD, the first bypass thyristor SCR1, the second bypass thyristor SCR2 composition；First semiconductor
The emitter of switch S1, the anode of first diode D1, the collector of the second semiconductor switch S2, the second diode D2 yin
Pole, the anode of the first bypass thyristor SCR1, the second SCR2 cathode for bypassing thyristor constitute power module after being connected with each other
First terminal T1；The collector of first semiconductor switch S1, the cathode of first diode D1 and the DC capacitor CD is just
Pole is connected with each other；The emitter of second semiconductor switch S2, the anode of the second diode D2, DC capacitor CD it is negative
Pole, the cathode of the first bypass thyristor SCR1, the second bypass thyristor SCR2 anode be interconnected to constitute the of power module
Two-terminal T2.
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| CN201710266790.1A CN107026577B (en) | 2017-04-21 | 2017-04-21 | Modular multilevel converter capable of cutting off direct-current short-circuit fault current |
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| CN201710266790.1A CN107026577B (en) | 2017-04-21 | 2017-04-21 | Modular multilevel converter capable of cutting off direct-current short-circuit fault current |
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| CN107026577B true CN107026577B (en) | 2019-05-21 |
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| CN110611421A (en) * | 2019-09-16 | 2019-12-24 | 山东泰开高压开关有限公司 | Modular multilevel converter bypass mechanism and working method |
| CN110677029A (en) * | 2019-10-21 | 2020-01-10 | 中国南方电网有限责任公司超高压输电公司 | Power module topology with passive overvoltage protection modular multilevel converter |
| CN111181416B (en) * | 2020-01-09 | 2021-03-19 | 华北电力大学 | Modular multilevel converter and direct-current fault clearing method |
| CN111142044B (en) * | 2020-02-05 | 2022-03-18 | 东南大学 | Direct current line fault secondary detection device with short-circuit fault energy absorption capacity |
| CN111786355A (en) * | 2020-06-23 | 2020-10-16 | 上海电器科学研究所（集团）有限公司 | Protection device and protection method for restraining short circuit of direct current bus support capacitor |
| CN112039354A (en) * | 2020-09-11 | 2020-12-04 | 华北电力大学 | Parallel hybrid MMC topology suitable for flexible direct-current power grid fault clearing |
| EP4007139B1 (en) * | 2020-11-25 | 2023-04-05 | Hitachi Energy Switzerland AG | Module comprising a switchable bypass device |
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| CN103337829B (en) * | 2013-07-04 | 2016-08-10 | 国家电网公司 | A kind of half control type passive injection current high voltage direct current breaker and its implementation |
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