CN105846704B - Power module and transverter and its charging method and DC Line Fault self-cleaning method - Google Patents
Power module and transverter and its charging method and DC Line Fault self-cleaning method Download PDFInfo
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- CN105846704B CN105846704B CN201610326336.6A CN201610326336A CN105846704B CN 105846704 B CN105846704 B CN 105846704B CN 201610326336 A CN201610326336 A CN 201610326336A CN 105846704 B CN105846704 B CN 105846704B
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- insulated gate
- gate bipolar
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of power module and transverter and its charging method and DC Line Fault self-cleaning method, the first wholly-controled device is concatenated with the second wholly-controled device in power module, and the second wholly-controled device is reversely concatenated with third wholly-controled device；First diode and the first wholly-controled device reverse parallel connection, second diode and the second wholly-controled device reverse parallel connection, third diode and third wholly-controled device reverse parallel connection, the first wholly-controled device, the second wholly-controled device and third wholly-controled device are in parallel with capacitance after concatenating；It applies in transverter, when the positive and negative extreme generation short trouble of transverter, as long as being latched all power modules simultaneously, capacitance voltage in the possible passage path of fault current in each power module and the alternating voltage connected higher than transverter, there will be no electric currents to flow through for current path in the possible passage path of fault current, realizes the self-cleaning of Converter DC-side failure.
Description
Technical field
The present invention relates to power electronics fields, more particularly to power module and transverter and its charging method and directly
Flow failure self-cleaning method.
Background technology
With the continuous development of power electronic technique, high voltage, large capacity have become the important development of power electronic technique
Direction, high voltage, large capacity power electronics transverter have important application in numerous occasions, such as：Light high pressure direct current
Transmission of electricity (Voltage Source Converter-High Voltage Direct Current, VSC-HVDC), Static Synchronous
Compensator (Static Synchronous Compensator, STATCOM), Active Power Filter-APF (Active Power
Filter, APF), high-voltage frequency converter etc., and just obtaining more and more concerns.
High voltage, large capacity multilevel power electronic inverter have various topological structures, including be based on valve group string
Two level blocks of connection, the more level blocks of diode clamp, the more level blocks of striding capacitance, combination converter structure, the cascade of H bridges
More level blocks, modular multilevel structure (Modular Multilevel Converter, MMC) etc..Wherein, H bridges grade
Join more level blocks, MMC structures because lacking nothing with modularized design, convenient for dilatation, exchange outlet side exit potential harmonic content
The advantages that needing alternating current filter, has in power grid and is more applied successfully.
Existing MMC structures are all made of half-H-bridge, H bridges or CDSM, and (Clamp Doulbe Sub-modular clamp double work(
Rate module) it is (as shown in Figure 1) as power unit module, high voltage, great Rong are reached by the output port serial cascade of module
The purpose of amount.Wherein SMnIndicate n-th of power module, UdcIndicate MMC Converter DC-side voltages.
It is existing not have direct current self-cleaning ability using the MMC structures of half H slab bridge structures, it need to closed in DC side failure
After locking all modules, jumping AC circuit breaker could be by fault clearance, and flow is complicated, and event is longer.It is changed using the MMC of CDSM structures
Stream device has DC Line Fault self-cleaning ability, but component is more in the power cell used, connects and control is more complicated.
Invention content
Based on this, it is necessary to do not have for existing modularization multi-level converter or DC Line Fault from understanding ability,
Or have DC Line Fault and remove function but complicated problem, a kind of new power module and transverter and its charging side are provided
Method and DC Line Fault self-cleaning method.
A kind of power module, including the first wholly-controled device, the second wholly-controled device, third wholly-controled device, the one or two
Pole pipe, the second diode, third diode and capacitance；
First wholly-controled device is concatenated with the second wholly-controled device, and the second wholly-controled device and third wholly-controled device are reversed
Concatenation；First diode and the first wholly-controled device reverse parallel connection, the second diode and the second wholly-controled device reverse parallel connection, the
Three diodes and third wholly-controled device reverse parallel connection, the first wholly-controled device, the second wholly-controled device and third full-control type device
It is in parallel with capacitance after part concatenation；
The tie point of first wholly-controled device and the second wholly-controled device is as the first connection terminal, third wholly-controled device
Tie point with capacitance is as second connection end, the output end of the first connection terminal and second connection end as power module
Son.
A kind of transverter, including first group of change of current bridge arm, second group of change of current bridge arm, first group of bridge arm reactor, second group
Bridge arm reactor, three charging resistors, one group of three-phase isolation switch and one group of single-phase isolating switch, first group of change of current bridge arm and
The item number of change of current bridge arm in two groups of change of current bridge arms is three, the bridge in first group of bridge arm reactor and second group of bridge arm reactor
The number of arm reactor is three；
The positive terminal of three change of current bridge arms in first group of change of current bridge arm is all connected to third tie point, second group of converter bridge
The negative pole end of three articles of change of current bridge arms in arm is all connected to the 4th tie point；
Three bridge arm electricity in the negative pole end and first group of bridge arm reactor of three change of current bridge arms in first group of change of current bridge arm
One end of anti-device connects one to one, the positive terminal of three change of current bridge arms in second group of change of current bridge arm and second group of bridge arm reactance
One end of three bridge arm reactors connects one to one in device, the other end of three bridge arm reactors in first group of bridge arm reactor
It connects one to one with the other end of three bridge arm reactors in second group of bridge arm reactor；
The other end one-to-one correspondence company of the other end and second group of three bridge arm reactor of first group of three bridge arm reactor
The three-phase of three tie points and three-phase isolation switch that connect connects one to one, the three-phase of three-phase isolation switch and three charging electricity
Resistance corresponds in parallel；
Second disconnecting switch is connected between third tie point and the 4th tie point；
Any one change of current bridge arm in first group of change of current bridge arm and second group of change of current bridge arm includes several of concatenation
Above-mentioned power module, the second tie point in previous power module are connect with the first tie point in the latter power module,
Positive terminal of first tie point as change of current bridge arm after concatenation in the power module of stem, second in the power module of tail portion
Negative pole end of the tie point as change of current bridge arm.
According to the power module and transverter of aforementioned present invention, the first wholly-controled device and the second full-control type in power module
Device concatenates, and the second wholly-controled device is reversely concatenated with third wholly-controled device；First diode and the first wholly-controled device are anti-
To parallel connection, the second diode and the second wholly-controled device reverse parallel connection, third diode and third wholly-controled device reverse parallel connection,
Entirety after first wholly-controled device, the second wholly-controled device and third wholly-controled device concatenation is in parallel with capacitance, the first full control
The tie point and the tie point of third wholly-controled device and capacitance of type device and the second wholly-controled device are as the defeated of power module
Go out terminal；During specific implementation, when normal work, three wholly-controled devices shutdowns are controlled by controlling signal, output needs
The level wanted, fail lockout power module, power module only have the current path to capacitor charging；It applies in transverter
In, when the positive and negative extreme generation short trouble of transverter, as long as being latched all power modules simultaneously, fault current is possible logical
Capacitance voltage in the path of road in each power module and the alternating voltage connected higher than transverter, the possible access of fault current
There will be no electric currents to flow through for current path in path, realizes the self-cleaning of Converter DC-side failure, and compared to CDSM
The MMC transverters of structure, the structure of the power module of transverter of the invention is simpler, and component is less, inside connection and
It controls simpler, reduces cost.
A kind of charging method of transverter, includes the following steps：
Disconnect three-phase isolation switch, be closed single-phase isolating switch, wherein transverter by three charging resistors and exchange be
System connection, AC system charge to all change of current bridge arms of transverter by three charging resistors；
All stablize to the half to AC system line voltage in the voltage of all change of current bridge arms, switches in each change of current bridge arm
The unlock of power module and blocking make the voltage of the power module of each change of current bridge arm all stablize to AC system line voltage；
The power module being latched in all change of current bridge arms disconnects single-phase isolating switch, is closed three-phase isolation switch；
The number for adjusting the power module unlocked in each change of current bridge arm makes the power module of each change of current bridge arm charge to specified
Voltage.
The charging to transverter may be implemented according to the charging method of the transverter of aforementioned present invention.
A kind of DC Line Fault self-cleaning method of transverter, includes the following steps：
After transverter charging complete, if short circuit occurs for third tie point and the 4th tie point, it is latched all change simultaneously
Flow the power module in bridge arm.
According to the DC Line Fault self-cleaning method of the transverter of aforementioned present invention, after transverter charging complete, if third
Short circuit occurs for tie point and the 4th tie point, then the power module being latched simultaneously in all change of current bridge arms, not because of transverter at this time
There are the accesses of fault current, and DC Line Fault self-cleaning may be implemented.
Description of the drawings
Fig. 1 is the structural schematic diagram of the power module and transverter in traditional technology；
Fig. 2 is the structural schematic diagram of the power module of one of embodiment；
Fig. 3 is a kind of concrete structure schematic diagram of the power module of one of embodiment；
Fig. 4 is another concrete structure schematic diagram of the power module of one of embodiment；
Fig. 5 is the structural schematic diagram of the transverter of one of embodiment；
Fig. 6-a illustrate for a kind of current path of the working condition one of power module in the transverter of one of embodiment
Figure；
Fig. 6-b show for another current path of the working condition one of power module in the transverter of one of embodiment
It is intended to；
Fig. 7-a illustrate for a kind of current path of the working condition two of power module in the transverter of one of embodiment
Figure；
Fig. 7-b show for another current path of the working condition two of power module in the transverter of one of embodiment
It is intended to；
Fig. 8 illustrates for a kind of current path of the working condition three of power module in the transverter of one of embodiment
Figure；
Fig. 9-a are a kind of charging current path schematic diagram of the transverter of one of embodiment；
Fig. 9-b are another charging current path schematic diagram of the transverter of one of embodiment.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to the accompanying drawings and embodiments, to this
Invention is described in further detail.It should be appreciated that the specific embodiments described herein are only used to explain the present invention,
Do not limit protection scope of the present invention.
It is shown in Figure 2, it is the structural schematic diagram of the power module of one embodiment.Power module in the embodiment,
Including the first wholly-controled device 110, the second wholly-controled device 120, third wholly-controled device 130, the first diode 140, second
Diode 150, third diode 160 and capacitance 170；
First wholly-controled device 110 is concatenated with the second wholly-controled device 120, and the second wholly-controled device 120 is controlled entirely with third
Type device 130 reversely concatenates；110 reverse parallel connection of first diode 140 and the first wholly-controled device, the second diode 150 and
Two wholly-controled devices, 120 reverse parallel connection, third diode 160 and 130 reverse parallel connection of third wholly-controled device, the first full-control type device
Part 110, the second wholly-controled device 120 and third wholly-controled device 130 are in parallel with capacitance 170 after concatenating；
The tie point of first wholly-controled device 110 and the second wholly-controled device 120 as the first connection terminal, control entirely by third
Type device 130 and the tie point of capacitance 170 are sub as second connection end, and the first connection terminal and second connection end are as power
The leading-out terminal of module.
In the present embodiment, the first wholly-controled device 110 is concatenated with the second wholly-controled device 120 in power module, and second
Wholly-controled device 120 is reversely concatenated with third wholly-controled device 130；First diode 140 and the first wholly-controled device 110 are reversed
Parallel connection, 120 reverse parallel connection of the second diode 150 and the second wholly-controled device, third diode 160 and third wholly-controled device
130 reverse parallel connections, the first wholly-controled device 110, the second wholly-controled device 120 and third wholly-controled device 130 concatenate after with electricity
Hold 170 in parallel, the leading-out terminals of the first connection terminal and second connection end as power module.During specific implementation,
When normal work, three wholly-controled device shutdowns are controlled by controlling signal, export the level of needs, fail lockout power mould
Block, power module only have the current path to capacitor charging；Apply in transverter, when transverter it is positive and negative extremely occur it is short
When the failure of road, as long as being latched all power modules simultaneously, the capacitance in the possible passage path of fault current in each power module
Voltage and the alternating voltage connected higher than transverter, there will be no electricity for the current path in the possible passage path of fault current
Stream flows through, and realizes the self-cleaning of Converter DC-side failure, and compared to the MMC transverters of CDSM structures, of the invention changes
The structure for flowing the power module of device is simpler, and component is less, inside connection and controls simpler, reduces cost.
First wholly-controled device 110, the second wholly-controled device 120 and third full-control type device in one of the embodiments,
The type and parameter all same of part 130.
In the present embodiment, the first wholly-controled device 110, the second wholly-controled device 120 and third wholly-controled device 130 are
Same type of wholly-controled device, parameter all same.
In one of the embodiments, the first diode 140, the second diode 150, third diode 160 type and
Parameter all same.
In the present embodiment, the first diode 140, the second diode 150, third diode 160 are same type of
Diode, parameter all same.
The first wholly-controled device 110 is concatenated with 120 forward direction of the second wholly-controled device in one of the embodiments,.
In one of the embodiments, as shown in figure 3, the first wholly-controled device 110 is the first insulated gate bipolar crystal
Pipe T1, the second wholly-controled device 120 are the second insulated gate bipolar transistor T2, and third wholly-controled device 130 insulate for third
Grid bipolar transistor T3；
The collector of the emitter of first insulated gate bipolar transistor T1 and the second insulated gate bipolar transistor T2 connect
It connects, the emitter of the second insulated gate bipolar transistor T2 is connect with the emitter of third insulated gate bipolar transistor T3；
First diode 140 is diode D1, and the second diode 150 is diode D2, and third diode 160 is diode
D3；
Diode D1 anode connect with the emitter of the first insulated gate bipolar transistor T1, the cathode of diode D1 and
The collector of first insulated gate bipolar transistor T1 connects；Anode and the second insulated gate bipolar transistor T2 of diode D2
Emitter connection, the cathode of diode D2 connect with the collector of the second insulated gate bipolar transistor T2；Diode D3's
Anode is connect with the emitter of third insulated gate bipolar transistor T3, and the cathode and third insulated gate bipolar of diode D3 is brilliant
The collector of body pipe T3 connects；
The anode of capacitance 170 is connect with the collector of the first insulated gate bipolar transistor T1, the cathode of capacitance 170 and the
The collector of three insulated gate bipolar transistor T3 connects.
In the present embodiment, wholly-controled device is insulated gate bipolar transistor, the first insulated gate bipolar transistor T1
It is concatenated with the second insulated gate bipolar transistor T2 forward directions, the second insulated gate bipolar transistor T2 and third insulated gate bipolar
Transistor T3 is reversely concatenated, and diode D1, diode D2, diode D3 and the first insulated gate bipolar transistor T1, second are absolutely
Edge grid bipolar transistor T2, third insulated gate bipolar transistor T3 correspond reverse parallel connection, the first insulated gate bipolar
After transistor T1, the second insulated gate bipolar transistor T2 and third insulated gate bipolar transistor T3 concatenation simultaneously with capacitance 170
Connection.The first insulated gate bipolar transistor T1, the second insulated gate bipolar transistor T2 and third insulated gate are controlled by triggering
The conducting state of bipolar transistor T3 can make power module be in different working conditions, to export different level,
U in Fig. 3SMFor the output voltage of power module, iSMFor the output current of power module, UcFor the voltage value of capacitance C.
The first wholly-controled device 110 is reversely concatenated with the second wholly-controled device 120 in one of the embodiments,.
In one of the embodiments, as shown in figure 4, the first wholly-controled device 110 is the first insulated gate bipolar crystal
Pipe T1, the second wholly-controled device 120 are the second insulated gate bipolar transistor T2, and third wholly-controled device 130 insulate for third
Grid bipolar transistor T3；
The emitter of the emitter of first insulated gate bipolar transistor T1 and the second insulated gate bipolar transistor T2 connect
It connects, the collector of the second insulated gate bipolar transistor T2 is connect with the collector of third insulated gate bipolar transistor T3；
First diode 140 is diode D1, and the second diode 150 is diode D2, and third diode 160 is diode
D3；
Diode D1 anode connect with the emitter of the first insulated gate bipolar transistor T1, the cathode of diode D1 and
The collector of first insulated gate bipolar transistor T1 connects；Anode and the second insulated gate bipolar transistor T2 of diode D2
Emitter connection, the cathode of diode D2 connect with the collector of the second insulated gate bipolar transistor T2；Diode D3's
Anode is connect with the emitter of third insulated gate bipolar transistor T3, and the cathode and third insulated gate bipolar of diode D3 is brilliant
The collector of body pipe T3 connects；
The anode of capacitance 170 is connect with the collector of the first insulated gate bipolar transistor T1, the cathode of capacitance 170 and the
The emitter of three insulated gate bipolar transistor T3 connects.
In the present embodiment, wholly-controled device is insulated gate bipolar transistor, the first insulated gate bipolar transistor T1
It is reversely concatenated with the second insulated gate bipolar transistor T2, the second insulated gate bipolar transistor T2 and third insulated gate bipolar
Transistor T3 is reversely concatenated, and diode D1, diode D2, diode D3 and the first insulated gate bipolar transistor T1, second are absolutely
Edge grid bipolar transistor T2, third insulated gate bipolar transistor T3 correspond reverse parallel connection, the first insulated gate bipolar
After transistor T1, the second insulated gate bipolar transistor T2 and third insulated gate bipolar transistor T3 concatenation simultaneously with capacitance 170
Connection.The first insulated gate bipolar transistor T1, the second insulated gate bipolar transistor T2 and third insulated gate are controlled by triggering
The conducting state of bipolar transistor T3 can make power module be in different working conditions, to export different level,
U in Fig. 4SMFor the output voltage of power module, iSMFor the output current of power module, UCFor the voltage value of capacitance C.
In the power module of the present invention, the first wholly-controled device 110 and the second wholly-controled device 120 be positive to be concatenated or instead
To concatenation, and wholly-controled device can be not only insulated gate bipolar transistor, can also be other kinds of complete
Control type device.
According to above-mentioned power module, the present invention also provides a kind of transverters, below with regard to the embodiment of the transverter of the present invention
It is described in detail.
It is shown in Figure 5, it is the structural schematic diagram of the transverter of one embodiment.Transverter in the embodiment includes the
One group of change of current bridge arm, second group of change of current bridge arm, first group of bridge arm reactor, second group of bridge arm reactor, three charging resistors, one
Group three-phase isolation switch and one group of single-phase isolating switch, first group of change of current bridge arm and the change of current bridge arm in second group of change of current bridge arm
Item number is three, and the number of first group of bridge arm reactor and the bridge arm reactor in second group of bridge arm reactor is three；
The positive terminal of three change of current bridge arms 210,220,230 in first group of change of current bridge arm is all connected to third tie point,
The negative pole end of three articles of change of current bridge arms 240,250,260 in second group of change of current bridge arm is all connected to the 4th tie point；
In the negative pole end and first group of bridge arm reactor of three change of current bridge arms 210,220,230 in first group of change of current bridge arm
One end of three bridge arm reactors Lc1, Lc2, Lc3 connect one to one, three change of current bridge arms in second group of change of current bridge arm
240, one end one of three bridge arm reactors Lc4, Lc5, Lc6 are a pair of in 250,260 positive terminal and second group of bridge arm reactor
It should connect, the other end and second group of bridge arm reactor of three bridge arm reactors Lc1, Lc2, Lc3 in first group of bridge arm reactor
In the other end of three bridge arm reactors Lc4, Lc5, Lc6 connect one to one；
The other end and second group of three bridge arm reactor Lc4, Lc5 of first group of three bridge arm reactors Lc1, Lc2, Lc3,
The three-phase for three tie points and three-phase isolation switch S1 that the other end of Lc6 connects one to one connects one to one, and three are separated by
The three-phase for leaving pass S1 is in parallel with three charging resistor R1, R2, R3 one-to-one correspondence；
Single-phase isolating switch S2 is connected between third tie point and the 4th tie point；
Any one change of current bridge arm in first group of change of current bridge arm and second group of change of current bridge arm includes several of concatenation
Above-mentioned power module, the second tie point in previous power module are connect with the first tie point in the latter power module,
Positive terminal of first tie point as change of current bridge arm after concatenation in the power module of stem, second in the power module of tail portion
Negative pole end of the tie point as change of current bridge arm.
In the present embodiment, above-mentioned power module is applied in transverter, when transverter works normally, if transverter
Positive and negative extreme (i.e. third tie point and the 4th tie point) generation short trouble when, as long as being latched power module simultaneously, for some reason
The voltage of capacitance in the barrier possible passage path of electric current in each power module and the alternating voltage connected higher than transverter, therefore
There will be no electric currents to flow through in the barrier possible passage path of electric current, realizes the self-cleaning of Converter DC-side failure, and compares
In the MMC transverters of CDSM structures, the structure of the power module of transverter of the invention is simpler, and component is less, internal
It connects and controls simpler, reduce cost.
Preferably, three charging resistor R1, R2, R3 parameters are identical.
In a specific embodiment, using wholly-controled device as insulated gate bipolar transistor (Insulated Gate
Bipolar Transistor) for, the operation principle of transverter is illustrated：
Power module in transverter controls the conducting state of insulated gate bipolar transistor by triggering, can make power
Module is in different working conditions, and there are three types of working conditions altogether for power module.
Working condition one, insulated gate bipolar transistor T1 conductings, insulated gate bipolar transistor T2, T3 cut-off；
As the output current i of power moduleSM<When 0, for current path as shown in Fig. 6-a, electric current passes through insulated gate bipolar
Transistor T1 and capacitance C forms access, and the voltage of power module output is the voltage U of capacitance CC, capacitance C is in discharge condition；
As the output current i of power moduleSM>When 0, for current path as shown in Fig. 6-b, electric current passes through diode D1 and electricity
Hold C and form access, the voltage of power module output is the voltage U of capacitance CC, capacitance C is in discharge condition.
Working condition two, insulated gate bipolar transistor T2, T3 conducting, insulated gate bipolar transistor T1 cut-offs；
As the output current i of power moduleSM<When 0, current path is as shown in Fig. 7-a, and electric current is by diode D2 and absolutely
Edge grid bipolar transistor T3 forms access, and the voltage of power module output is 0, and capacitance C is in bypass condition；
As the output current i of power moduleSM>When 0, for current path as shown in Fig. 7-b, electric current passes through insulated gate bipolar
Transistor T2 and diode D3 forms access, and the voltage of power module output is 0, and capacitance C is in bypass condition.
Working condition three, insulated gate bipolar transistor T1, T2, T3 are turned off；
As the output current i of power moduleSM<When 0, entire power module is in cut-off state, does not have current path；
As the output current i of power moduleSM>When 0, current path is as shown in figure 8, electric current passes through diode D2 and capacitance
C forms access, and the voltage of power module output is the voltage U of capacitance CC, capacitance C is in charged state.
According to above-mentioned transverter, the present invention also provides a kind of charging methods of transverter, below with regard to the transverter of the present invention
The embodiment of charging method be described in detail.
In one embodiment, a kind of charging method of transverter, includes the following steps：
Disconnect three-phase isolation switch S1, be closed single-phase isolating switch S2, wherein transverter by three charging resistor R1,
R2, R3 and AC system connect, and AC system charges to all change of current bridge arms of transverter by three charging resistors；
All stablize to the half to AC system line voltage in the voltage of all change of current bridge arms, switches in each change of current bridge arm
The unlock of power module and blocking make the voltage of the power module of each change of current bridge arm all stablize to AC system line voltage；
The power module being latched in all change of current bridge arms disconnects single-phase isolating switch S2, is closed three-phase isolation switch S1；
The number for adjusting the power module unlocked in each change of current bridge arm makes the power module of each change of current bridge arm charge to specified
Voltage.
Preferably, transverter needs to carry out initialization charging before normal work.By the operation principle of transverter it is found that
In the case that T1, T2, T3 are latched, on transverter three-phase between bridge arm (i.e. first group of change of current bridge arm) or three-phase lower bridge arm (i.e.
Second group of change of current bridge arm) between cannot constitute access, i.e. exchange side breaker only in closing, transverter cannot complete initialization and fill
Electricity.The present invention by increasing single-phase isolating switch S2 between the positive and negative electrode busbar of transverter (i.e. transverter positive and negative extreme),
To realize that entire charging process, charging process divide three phases.
Stage one is charged to the half of ac line voltage with charging resistor.Process is：By the three-phase isolation switch S1 of exchange side
It disconnects, charging resistor is put into, while the single-phase isolating switch S2 of DC side being closed, then positive and negative electrode bus short join closes
Upper exchange side breaker starts to charge up.When certain phase voltage amplitude highest, realize to the upper of this phase lower bridge arm and remaining two-phase
Bridge arm charges；When certain phase voltage amplitude is minimum, the lower bridge arm of upper bridge arm and remaining two-phase to this phase charges.By taking A phases as an example,
When A phase voltage highests, the charging to bridge arm in A phases lower bridge arm and its B, C phase is realized, charging process is as shown in Fig. 9-a；A phases
When voltage is minimum, the charging to bridge arm in A phases and its B, C phase lower bridge arm is realized, charging process is as shown in Fig. 9-b.Charging is steady
After fixed, the half of the voltage of all bridge arms close to AC system line voltage.
Stage two：Transverter is unlocked, bridge arm all power module conducting T2, T3, the locking of remaining bridge arm in A phases are made, you can
The upper and lower bridge arm of B, C phase is set to charge to close to AC system line voltage；Then make in B phases all power modules conducting T2 of bridge arm,
T3, remaining bridge arm locking, you can the upper and lower bridge arm of A phases is made also to charge to close to AC system line voltage；
Stage three：All bridge arms are latched, single-phase isolating switch S2 is disconnected and is unlocked again after closing three-phase isolation switch S1
All bridge arms, into the normal controllable charging per phase bridge arm.By taking bridge arm on three-phase as an example, implementation process is to keep bridge in A phases all
T2, T3 is connected in power module, the number of the input power module by controlling bridge arm in B, C two-phase, you can make its power module
Charge to load voltage value；Similarly, by making all power modules of bridge in B phases that T2, T3 be connected, by controlling bridge arm in A two-phases
Input power module number, you can so that the power module of A phases is also charged to load voltage value.The charging of lower bridge arm three-phase
Journey is similar with upper bridge arm.
According to above-mentioned transverter, the present invention also provides a kind of DC Line Fault self-cleaning methods of transverter, below with regard to this hair
The embodiment of the DC Line Fault self-cleaning method of bright transverter is described in detail.
In one embodiment, a kind of DC Line Fault self-cleaning method of transverter, includes the following steps：
After transverter charging complete, if short circuit occurs for third tie point and the 4th tie point, it is latched all change simultaneously
Flow the power module in bridge arm.
Preferably, transverter charging complete disconnects single-phase isolating switch S2, into after normal mode of operation, if hair
Raw transverter positive and negative electrode terminal shortcircuit failure, while after being latched all power modules of each bridge arm, theoretically there is also Fig. 9-for electric current
Circulation path in a and Fig. 9-b.But when working normally, power module capacitance voltage and higher than ac line voltage in above-mentioned path,
The T1 of all power modules is in reverse blocking state, it is impossible to be connected, so when Fig. 9-a and Fig. 9-b in current path not
There may be electric current to flow through, that is, realize the self-cleaning of DC side failure.
In case of monopole shorted to earth, while after being latched all power modules of each bridge arm, then not there is electric current
Access also achieves the self-cleaning of DC side failure.
The transverter of the present invention has DC Line Fault self-cleaning ability, and exchange need to be disconnected by solving semi-bridge type MMC transverters
Breaker removes the defect of DC side failure, it is found that insulated gate bipolar used in the power module of the present invention compared with Fig. 1
The number of transistor is the 3/4 of bridge-type MMC transverters；Compared with CDSM, more 1/2 IGBT, a few diode per level,
Economy is suitable, but component is less, and inside connection and control are more simple.
In the present invention, the ordinal numbers such as " first ", " second " are intended merely to distinguish involved component, are not
Component itself is defined.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of power module, which is characterized in that including the first wholly-controled device, the second wholly-controled device, third full-control type device
Part, the first diode, the second diode, third diode and capacitance；
First wholly-controled device is concatenated with second wholly-controled device, and second wholly-controled device and the third are complete
Control type device reversely concatenates；First diode and the first wholly-controled device reverse parallel connection, second diode with
The second wholly-controled device reverse parallel connection, the third diode and the third wholly-controled device reverse parallel connection, described the
It is in parallel with the capacitance after one wholly-controled device, second wholly-controled device and third wholly-controled device concatenation；
For the tie point of first wholly-controled device and second wholly-controled device as the first connection terminal, the third is complete
Control type device and the tie point of the capacitance are sub as second connection end, first connection terminal and second connection end
Leading-out terminal as the power module.
2. power module according to claim 1, which is characterized in that first wholly-controled device, the second full control
The type and parameter all same of type device and the third wholly-controled device.
3. power module according to claim 1, which is characterized in that first diode, second diode, institute
State the type and parameter all same of third diode.
4. power module according to claim 1, which is characterized in that first wholly-controled device and the described second full control
Type device forward direction concatenates.
5. power module according to claim 4, which is characterized in that first wholly-controled device is that the first insulated gate is double
Bipolar transistor, second wholly-controled device are the second insulated gate bipolar transistor, and the third wholly-controled device is the
Three insulated gate bipolar transistors；
The emitter of first insulated gate bipolar transistor and the collector of second insulated gate bipolar transistor connect
It connects, the emitter of second insulated gate bipolar transistor and the emitter of the third insulated gate bipolar transistor connect
It connects；
The anode of first diode is connect with the emitter of first insulated gate bipolar transistor, the one or two pole
The cathode of pipe is connect with the collector of first insulated gate bipolar transistor；The anode of second diode and described the
The emitter of two insulated gate bipolar transistors connects, and the cathode of second diode is brilliant with second insulated gate bipolar
The collector of body pipe connects；The anode of the third diode connects with the emitter of the third insulated gate bipolar transistor
It connects, the cathode of the third diode is connect with the collector of the third insulated gate bipolar transistor；
The anode of the capacitance is connect with the collector of first insulated gate bipolar transistor, the cathode of the capacitance and institute
State the collector connection of third insulated gate bipolar transistor.
6. power module according to claim 1, which is characterized in that first wholly-controled device and the described second full control
Type device reversely concatenates.
7. power module according to claim 6, which is characterized in that first wholly-controled device is that the first insulated gate is double
Bipolar transistor, second wholly-controled device are the second insulated gate bipolar transistor, and the third wholly-controled device is the
Three insulated gate bipolar transistors；
The emitter of first insulated gate bipolar transistor and the emitter of second insulated gate bipolar transistor connect
It connects, the collector of second insulated gate bipolar transistor and the collector of the third insulated gate bipolar transistor connect
It connects；
The anode of first diode is connect with the emitter of first insulated gate bipolar transistor, the one or two pole
The cathode of pipe is connect with the collector of first insulated gate bipolar transistor；The anode of second diode and described the
The emitter of two insulated gate bipolar transistors connects, and the cathode of second diode is brilliant with second insulated gate bipolar
The collector of body pipe connects；The anode of the third diode connects with the emitter of the third insulated gate bipolar transistor
It connects, the cathode of the third diode is connect with the collector of the third insulated gate bipolar transistor；
The anode of the capacitance is connect with the collector of first insulated gate bipolar transistor, the cathode of the capacitance and institute
State the emitter connection of third insulated gate bipolar transistor.
8. a kind of transverter, which is characterized in that including first group of change of current bridge arm, second group of change of current bridge arm, first group of bridge arm reactance
Device, second group of bridge arm reactor, three charging resistors, one group of three-phase isolation switch and one group of single-phase isolating switch, described first
Group change of current bridge arm and the item number of the change of current bridge arm in second group of change of current bridge arm are three, first group of bridge arm reactor and
The number of bridge arm reactor in second group of bridge arm reactor is three；
The positive terminal of three change of current bridge arms in first group of change of current bridge arm is all connected to third tie point, and described second group is changed
The negative pole end of three articles of change of current bridge arms in stream bridge arm is all connected to the 4th tie point；
The negative pole end of three change of current bridge arms in first group of change of current bridge arm and three bridges in first group of bridge arm reactor
One end of arm reactor connects one to one, the positive terminal of three change of current bridge arms in second group of change of current bridge arm and second group
One end of three bridge arm reactors connects one to one in bridge arm reactor, three bridge arm electricity in first group of bridge arm reactor
The other end of anti-device and the other end of three bridge arm reactors in second group of bridge arm reactor connect one to one；
The other end of first group of three bridge arm reactor and the other end one of second group of three bridge arm reactor are a pair of
The three-phase of three tie points and the three-phase isolation switch that should connect connects one to one, the three-phase of the three-phase isolation switch
It is in parallel with three charging resistor one-to-one correspondence；
The single-phase isolating switch is connected between the third tie point and the 4th tie point；
Any one change of current bridge arm in first group of change of current bridge arm and second group of change of current bridge arm includes several of concatenation
Power module as claimed in any of claims 1 to 7 in one of claims, the second tie point in previous power module and the latter work(
Rate mould the first tie point in the block connects, and the first tie point after concatenation in the power module of stem is as the change of current bridge arm
Positive terminal, negative pole end of second tie point as the change of current bridge arm in the power module of tail portion.
9. a kind of charging method of transverter as claimed in claim 8, which is characterized in that include the following steps：
The three-phase isolation switch is disconnected, the single-phase isolating switch is closed, wherein transverter passes through three charging resistors
It is connect with AC system, the AC system carries out all change of current bridge arms of the transverter by three charging resistors
Charging；
All stablize to the half to AC system line voltage in the voltage of all change of current bridge arms, switches power in each change of current bridge arm
The unlock of module and blocking make the voltage of the power module of each change of current bridge arm all stablize to the AC system line voltage；
The power module being latched in all change of current bridge arms, disconnects the single-phase isolating switch, is closed the three-phase isolation switch；
The number for adjusting the power module unlocked in each change of current bridge arm makes the power module of each change of current bridge arm charge to specified electricity
Pressure.
10. a kind of DC Line Fault self-cleaning method of transverter as claimed in claim 8, which is characterized in that include the following steps：
After the transverter charging complete, if short circuit occurs for the third tie point and the 4th tie point, it is latched institute simultaneously
There is the power module in change of current bridge arm.
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| CN107728508B (en) * | 2017-09-01 | 2019-11-01 | 中国南方电网有限责任公司电网技术研究中心 | A kind of control guard method of flexible direct current system and its control protective unit |
| WO2019228028A1 (en) * | 2018-05-28 | 2019-12-05 | 南京南瑞继保电气有限公司 | Compensator, control method and device therefor |
| CN109088549B (en) * | 2018-08-23 | 2020-08-04 | 中国能源建设集团广东省电力设计研究院有限公司 | Current converter using split reactance |
| CN112436724B (en) * | 2019-08-26 | 2022-05-17 | 南京南瑞继保电气有限公司 | Current conversion device and assembly thereof, reactive power compensation device, current converter and control method thereof |
| CN110868084B (en) * | 2019-11-20 | 2020-11-10 | 中国南方电网有限责任公司超高压输电公司广州局 | Power module charging mode conversion strategy based on temporary locking function |
| CN113904573B (en) * | 2021-10-13 | 2023-10-27 | 山东大学 | Half-bridge improved MMC submodule topological structure and control method thereof |
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| CN103731059A (en) * | 2013-06-13 | 2014-04-16 | 华北电力大学 | Novel double-clamping sub-module structure circuit of modular multilevel converter |
| CN104052026A (en) * | 2014-05-29 | 2014-09-17 | 华中科技大学 | Submodule topology for modular multi-level transverter and application of modular multi-level transverter |
| CN204304822U (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | A kind of modularization multi-level converter of mixed structure |
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| CN103731059A (en) * | 2013-06-13 | 2014-04-16 | 华北电力大学 | Novel double-clamping sub-module structure circuit of modular multilevel converter |
| CN104052026A (en) * | 2014-05-29 | 2014-09-17 | 华中科技大学 | Submodule topology for modular multi-level transverter and application of modular multi-level transverter |
| CN204304822U (en) * | 2014-12-31 | 2015-04-29 | 国家电网公司 | A kind of modularization multi-level converter of mixed structure |
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