CN109256951A - A kind of DC voltage conversion device and its control method - Google Patents
A kind of DC voltage conversion device and its control method Download PDFInfo
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- CN109256951A CN109256951A CN201811144825.5A CN201811144825A CN109256951A CN 109256951 A CN109256951 A CN 109256951A CN 201811144825 A CN201811144825 A CN 201811144825A CN 109256951 A CN109256951 A CN 109256951A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/285—Single converters with a plurality of output stages connected in parallel
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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
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0074—Plural converter units whose inputs are connected in series
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a kind of DC voltage conversion device and its method processed.The DC voltage conversion device exports current-limiting reactor by high-voltage end and n low-voltage direct converter unit is constituted, and wherein n is any positive integer.The high-voltage end of n low-voltage direct converter unit is connected in series with current-limiting reactor again after being connected in series, and low-pressure end is connected in parallel.The low-voltage direct converter unit is made of half-bridge module, isolated form DC/DC conversion module and chopper circuit module three-level.The present invention also provides corresponding failure current limit control methods, realize DC voltage conversion device high and low pressure short trouble and pass through function.
Description
Technical field
The invention belongs to electric power direct current transmission and distribution technical field, it is related to a kind of DC voltage conversion device and its controlling party
Method.
Background technique
With the application of DC distribution, need to study the direct current transformation equipment having with AC transformer similar performance,
While realizing DC voltage conversion, fault ride-through capacity of the DC converter under system short-circuit fault is furtherd investigate, is made
After equipment has short trouble removing, the ability that fast quick-recovery is restarted has important research meaning.
In DC distribution net application field, the commutator transformer based on type modular input connection output-parallel topological structure is obtained
Extensive research was obtained, but the topology commutator transformer is applied in direct current distribution and is also faced with following problem: (1) system high pressure at present
When short trouble occurs for end, high-pressure side serial module structure capacitor discharges direct short-circuit, and the increasing rate of short circuit current is exceedingly fast, and partly leads
Serious overcurrent can also occur for body device, larger to capacitor and semiconductor devices harm, simultaneously as module capacitance short circuit dischange, from
Capacitor takes the power supply media board of electricity to export undervoltage lockout, leads to commutator transformer disorderly closedown, cannot achieve fault traversing function,
Additionally due to this peak value of short is very big, but the duration is extremely short, and the protective relaying device of high-voltage fence can not utilize this
Fault current feature carries out fault location, so that fault clearance can not be carried out；(2) there is short trouble in converting means low-pressure end
When, low-pressure side parallel module capacitor discharges direct short-circuit, and the increasing rate of short circuit current is exceedingly fast, and semiconductor devices can also occur
Serious overcurrent, it is larger to capacitor and semiconductor devices harm, simultaneously as module capacitance short circuit dischange, the power supply of electricity is taken from capacitor
Board exports undervoltage lockout, leads to commutator transformer disorderly closedown, cannot achieve fault traversing function, additionally due to this is short-circuit
Current peak is very big, but the duration is extremely short, the protective relaying device of low voltage electric network can not using this fault current feature into
Row fault location, so that fault clearance can not be carried out.
Application No. is CN201510097371.0, a kind of entitled " High Frequency Link bidirectional, dc of switching capacity access
Transformer and its control method " patent, be related to it is a kind of by DC converting unit prime increase level-one half-bridge converter
The method for realizing Redundancy Design, the patent when short trouble occurs for high voltage direct current side or low-voltage direct side, can by capacitor from therefore
Barrier point excision, capacitance voltage are maintained.But all switching tubes need to be turned off when there is short trouble by this method, to short circuit
The shortcomings that it is zero that short circuit current is injected in fault point, the method is: the protective relaying device in DC grid will be unable to obtain failure
Fault current needed for positioning, can not cut off fault point, so leading to DC voltage conversion device and DC distribution net
Tripping is stopped transport, and system fault-free ride-through capability constrains the large-scale engineering applications of DC distribution net.
Summary of the invention
The purpose of the present invention is in order to solve the above technical problems, provide a kind of DC voltage conversion device and its controlling party
Method, the ability for making its internal subelement have the fast quick-recovery of system after short-circuit current limitation and fault clearance, realizes straight
Flow the fault traversing of distribution network system.
In order to achieve the above objectives, the technical scheme is that
A kind of DC voltage conversion device exports current-limiting reactor L1 by high-voltage end and n low-voltage direct converter unit is constituted,
Middle n is any positive integer；The input terminal of the n low-voltage direct converter unit is connected with current-limiting reactor L1 again after being connected in series
It is connected to the high-voltage end of DC voltage conversion device, the output end of the n low-voltage direct converter unit is connected in parallel conduct
The low-pressure end of DC voltage conversion device.
The low-voltage direct converter unit is by half-bridge module, isolated form DC/DC conversion module, chopper circuit module three-level
Composition.The half-bridge module input terminal is the input terminal of low-voltage direct converter unit, half-bridge module output end and isolated form DC/DC
The input terminal of conversion module connects, and the output end of isolated form DC/DC conversion module is connect with chopper circuit module input, copped wave
Circuit module output end is the output end of low-voltage direct converter unit.
The half-bridge module is made of two full-controlled switch pipes containing anti-paralleled diode, upper and lower two switching tubes series connection
Half-bridge module is constituted, the down tube both ends of half-bridge module are the input terminal of half-bridge module, upper and lower two switching tube pipes in series half
The output end of bridge module.
The isolated form DC/DC conversion module includes inverter, phase shift inductance, high-frequency isolation transformer, rectifier, described
Inverter direct-flow side, the equal shunt capacitor in rectifier DC side.The DC side of the inverter is isolated form DC/DC conversion module
Input terminal, the exchange side of the inverter connects and connects the primary side of high-frequency isolation transformer after the phase shift inductance link, described
The exchange side of rectifier connects the secondary side of the high-frequency isolation transformer, and the DC side of rectifier is that isolated form DC/DC converts mould
Block output end.The inverter and the rectifier include four full-controlled switch pipes containing anti-paralleled diode, and four contain
The full-controlled switch pipe of anti-paralleled diode connects into full bridge structure.
The chopper circuit module is made of two full-controlled switch pipes and a current sharing inductor containing anti-paralleled diode,
Input terminal of the half-bridge bridge arm of chopper circuit module in series as chopper circuit module, half-bridge bridge arm above and below two switching tubes
Midpoint concatenated with current sharing inductor after constitute the output head anode of chopper circuit module, the lower end of lower switch pipe is chopper circuit mould
Block negative pole of output end.
The present invention also provides a kind of control methods of above-mentioned DC voltage conversion device, comprising:
A) under normal operation, the conducting of half-bridge module upper switch pipe, the shutdown of lower switch pipe, high-voltage end DC voltage is by series connection company
The switching tube of the isolated form DC/DC conversion module inverter direct-flow side shared connect, isolated form DC/DC conversion module unlocks fortune
Row, realizes the transmission of power, the upper switch pipe conducting of chopper circuit module, the shutdown of lower switch pipe, the bearing power of low-pressure end by
The isolated form DC/DC conversion module rectifier DC side being connected in parallel provides jointly；
B) when short trouble occurs in high-voltage end, isolated form DC/DC conversion module keeps unlock operating status, is exported by high-voltage end
Current closed-loop adjust strategy or Hysteresis control strategy, control the upper and lower switching tube of half-bridge module conducting dutycycle, by device to
The short-circuit current of short dot injection is limited within limits；
C) after fault clearance, half-bridge module upper switch pipe is restored to the on state under normal operation, lower switch
Pipe is restored to the off state under normal operation, and DC voltage conversion device completes the fast quick-recovery after fault clearance,
It realizes high-voltage end short trouble and passes through function.
The present invention also provides a kind of control methods of above-mentioned DC voltage conversion device, comprising:
A) under normal operation, the conducting of half-bridge module upper switch pipe, the shutdown of lower switch pipe, high-voltage end DC voltage is by connecting
The isolated form DC/DC conversion module inverter direct-flow side shared of connection, the switching tube unlock of isolated form DC/DC conversion module
The transmission of power, the upper switch pipe conducting of chopper circuit module, the shutdown of lower switch pipe, the bearing power of low-pressure end are realized in operation
It is provided jointly by the isolated form DC/DC conversion module rectifier DC side being connected in parallel；
B) when short trouble occurs in low-pressure end, isolated form DC/DC conversion module keeps unlock operating status, is exported by low-pressure end
Current closed-loop adjust strategy or Hysteresis control strategy, control chopper circuit module switch pipe conducting dutycycle, by device to
The short-circuit current of short dot injection is limited within limits；
C) after fault clearance, chopper circuit module upper switch pipe is restored to the on state under normal operation, under
Switching tube is restored to the off state under normal operation, and DC voltage conversion device completes the fortune of the recovery after fault clearance
Row, realizes low-pressure end short trouble and passes through function.
Compared with existing DC voltage conversion device, the beneficial effects of the present invention are:
(1) when short trouble occurs in high pressure end system, isolated form DC/DC conversion module keeps unlock operating status, passes through half-bridge
Module control, limitation high-pressure series module capacitance electric discharge, realizes the limitation of fault current, after fault clearance, system can be with
Fast quick-recovery operates normally, and so that device is had high-voltage end short trouble ride-through capability, power supply reliability obtains larger raising.
(2) when short trouble occurs in low pressure end system, isolated form DC/DC conversion module keeps unlock operating status, passes through
Chopper circuit module control, limitation low pressure parallel module capacitor electric discharge, realizes the limitation of fault current, after fault clearance,
System can fast quick-recovery operate normally, so that device is had a low-pressure end short trouble ride-through capability, power supply reliability obtain compared with
It is big to improve.
(3) scheme of existing patent document is compared, when short trouble occurs in system high and low pressure end, device switching tube is not
It complete switches off, but by Current limited Control, regulating switch pipe conducting dutycycle continues to inject certain short circuit electricity to short dot
Stream, being conducive to power distribution network protective relaying device progress fault location to accurately be purged fault point makes DC distribution net
Fast quick-recovery operates normally, and solves the problems, such as the fault traversing of DC distribution net equipment.
Detailed description of the invention
Fig. 1 is DC voltage conversion device topology diagram of the invention；
Fig. 2 is the half-bridge module topology diagram in DC voltage conversion device of the invention.
Fig. 3 is the isolated form DC/DC conversion module topology diagram in DC voltage conversion device of the invention.
Fig. 4 is the chopper circuit module topology structure chart of DC voltage conversion device of the invention.
Fig. 5 is the short trouble current limliting and switching tube drive waveforms of DC voltage conversion device of the invention.
Specific embodiment
Below with reference to attached drawing, technical solution of the present invention is described in detail.
DC voltage conversion device topological structure of the invention is as shown in Figure 1, include that high-voltage end exports current-limiting reactor L1
It is constituted with n low-voltage direct converter unit, wherein n is any positive integer.The input terminal string of the n low-voltage direct converter unit
The high-voltage end as DC voltage conversion device, the n low-voltage direct is connected in series after connection connection with current-limiting reactor L1 again
The output end of converter unit is connected in parallel the low-pressure end as DC voltage conversion device.
The low-voltage direct converter unit is by half-bridge module, isolated form DC/DC conversion module, chopper circuit module three-level
Composition.The half-bridge module input terminal is the input terminal of low-voltage direct converter unit, half-bridge module output end and isolated form DC/DC
The input terminal of conversion module connects, and the output end of isolated form DC/DC conversion module is connect with chopper circuit module input, copped wave
Circuit module output end is the output end of low-voltage direct converter unit.
As shown in Fig. 2, the half-bridge module of the low-voltage direct converter unit, by two full controls containing anti-paralleled diode
Type switching tube S1, S2 composition, upper tube S1 and down tube S2 half-bridge module in series, the both ends down tube S2 of half-bridge module are half-bridge mould
The input terminal of block, S1, S2 series connection both ends constitute the output end of half-bridge module.
As shown in figure 3, the isolated form DC/DC conversion module of the low-voltage direct converter unit, including inverter full-bridge
Module, phase shift inductance L, high-frequency isolation transformer T, rectifier full-bridge modules, the inverter full-bridge modules DC side parallel electricity
Container C1, rectifier full-bridge modules DC side parallel capacitor C2.The DC side of the inverter is that isolated form DC/DC converts mould
Block input terminal, the exchange side of the inverter, which is connected, connects the primary side of the high-frequency isolation transformer T after the phase shift inductance L,
The exchange side of the rectifier connects the secondary side of the high-frequency isolation transformer T, and the DC side of the rectifier is isolated form DC/
DC conversion module output end.The inverter includes four full-controlled switch pipe Q1, Q2, Q3, Q4 containing anti-paralleled diode, institute
Stating rectifier includes four full-controlled switch pipe Q5, Q6, Q7, Q8 containing anti-paralleled diode.
As shown in figure 4, the chopper circuit module of the low-voltage direct converter unit, which is characterized in that by two containing anti-
Full-controlled switch pipe S3, S4 and current sharing inductor L2 of parallel diode are formed, two switching tubes chopper circuit module in series
Input terminal, S3, S4 series connection bridge arm midpoint concatenated with inductance L2 after composition chopper circuit module output head anode, the transmitting of S4
Extremely chopper circuit module negative pole of output end.
The present invention also provides a kind of control methods of above-mentioned DC voltage conversion device, comprising:
A) under normal operation, half-bridge module upper switch pipe S1 conducting, lower switch pipe S2 shutdown, high-voltage end DC voltage is by going here and there
Join the isolated form DC/DC conversion module inverter direct-flow side capacitor shared of connection, the switch of isolated form DC/DC conversion module
The transmission of power, the upper switch pipe S3 conducting of chopper circuit module, lower switch pipe S4 shutdown, low-pressure end are realized in pipe unlock operation
Bearing power provided jointly by the isolated form DC/DC conversion module rectifier DC side being connected in parallel；
B) when short trouble occurs in high-voltage end, isolated form DC/DC conversion module keeps unlock operating status, is exported by high-voltage end
Current closed-loop adjusts strategy or Hysteresis control strategy, controls the conducting dutycycle of half-bridge module switching tube S1, by device to short
The short-circuit current of waypoint injection is limited within limits, and when Fig. 5 is using Hysteresis control, short circuit current is limited in
The driving signal of current waveform and switching tube S1 within 1.3pu ~ 1.5pu rated current range, when S1 is opened, S2 is turned off,
Fault current rises, and when reaching 1.5pu to fault current, shutdown S1, opens S2, fault current starts decaying decline, works as decline
When to 1.3pu, S1, shutdown S2 are opened again, it is seen that pass through the above Hysteresis control, fault current average value is controlled in 1.4pu
Rated current, protective relaying device can execute differential overcurrent protection and carry out fault location and fault clearance, and Chinese patent " one
The High Frequency Link bidirectional, dc transformer and its control method of kind of switching capacity access " in take method to be will when there is short trouble
All switching tubes are turned off, and are zero to short circuit trouble point injection short circuit current, the protective relaying device in DC grid will be unable to
Fault current needed for obtaining fault location, and then fault point can not accurately be cut off；
C) after fault clearance, half-bridge module upper switch pipe S1 is restored to the on state under normal operation, under open
It closes pipe S2 and is restored to the off state under normal operation, DC voltage conversion device completes quick extensive after fault clearance
It is multiple, it realizes high-voltage end short trouble and passes through function.
The present invention also provides a kind of control methods of above-mentioned DC voltage conversion device, comprising:
A) under normal operation, half-bridge module upper switch pipe S1 conducting, lower switch pipe S2 shutdown, high-voltage end DC voltage by
The isolated form DC/DC conversion module inverter direct-flow side shared of series connection, the switching tube of isolated form DC/DC conversion module
The transmission of power, the upper switch pipe S3 conducting of chopper circuit module are realized in unlock operation, and lower switch pipe S4 is turned off, low-pressure end
Bearing power is provided jointly by the isolated form DC/DC conversion module rectifier DC side being connected in parallel；
B) when short trouble occurs in low-pressure end, isolated form DC/DC conversion module keeps unlock operating status, is exported by low-pressure end
Current closed-loop adjusts strategy or Hysteresis control strategy, the conducting dutycycle of chopper circuit module switch pipe S3 is controlled, by device
The short-circuit current injected to short dot is limited within limits, and when Fig. 5 is using Hysteresis control, short circuit current is limited
The driving signal for making the current waveform and switching tube S3 within 1.3pu ~ 1.5pu rated current range, when S3 is opened, S4 shutdown
When, fault current rises, and when reaching 1.5pu to fault current, shutdown S3, opens S4, fault current starts decaying decline, instantly
When dropping to 1.3pu, S3, shutdown S4 are opened again, it is seen that pass through the above Hysteresis control, fault current average value is controlled in
1.4pu rated current, protective relaying device can execute differential overcurrent protection and carry out fault location and fault clearance, and Chinese
Method is taken in patent " a kind of the High Frequency Link bidirectional, dc transformer and its control method of switching capacity access " to there is short circuit
All switching tubes are turned off when failure, are zero to short circuit trouble point injection short circuit current, the relay protection dress in DC grid
Fault current needed for will be unable to obtain fault location is set, and then fault point can not accurately be cut off；
C) after fault clearance, chopper circuit module upper switch pipe S3 is restored to the on state under normal operation,
Lower switch pipe S4 is restored to the off state under normal operation, and DC voltage conversion device completes extensive after fault clearance
Multiple operation, realizes low-pressure end short trouble and passes through function.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, is merely illustrative of the invention's technical idea,
This does not limit the scope of protection of the present invention.Person of an ordinary skill in the technical field is to be understood that: to of the invention
Specific embodiment is modified or replaced equivalently, and without departing from any modification of technical idea proposed by the present invention and range
Or equivalent replacement should all cover in the range of the claims in the present invention.
Claims (6)
1. a kind of DC voltage conversion device, it is characterised in that: export current-limiting reactor L1 and n low-pressure direct rheology by high-voltage end
Unit composition is changed, wherein n is any positive integer；The input terminal of the n low-voltage direct converter unit be connected in series after again with limit
Flow high-voltage end of the reactor L1 series connection as DC voltage conversion device, the output of the n low-voltage direct converter unit
End is connected in parallel the low-pressure end as DC voltage conversion device；
The low-voltage direct converter unit is made of half-bridge module, isolated form DC/DC conversion module, chopper circuit module three-level；
The half-bridge module input terminal is the input terminal of low-voltage direct converter unit, half-bridge module output end and isolated form DC/DC
The input terminal of conversion module connects, and the output end of isolated form DC/DC conversion module is connect with chopper circuit module input, copped wave
Circuit module output end is the output end of low-voltage direct converter unit.
2. a kind of DC voltage conversion device as described in claim 1, it is characterised in that: the half-bridge module is by two containing anti-
The full-controlled switch pipe of parallel diode forms, upper and lower two switching tubes half-bridge module in series, the down tube two of half-bridge module
End is the input terminal of half-bridge module, the output end of upper and lower two switching tubes half-bridge module in series.
3. a kind of DC voltage conversion device as claimed in claim 1 or 2, it is characterised in that: the isolated form DC/DC transformation
Module includes inverter, phase shift inductance, high-frequency isolation transformer, rectifier, and the inverter direct-flow side, rectifier DC side are equal
Shunt capacitor；The DC side of the inverter is isolated form DC/DC conversion module input terminal, the exchange side series connection institute of inverter
The primary side that the high-frequency isolation transformer is connected after phase shift inductance is stated, the exchange side of the rectifier connects high-frequency isolation transformer
Secondary side, the DC side of rectifier is isolated form DC/DC conversion module output end；The inverter and rectifier include four
Full-controlled switch pipe containing anti-paralleled diode, four full-controlled switch pipes containing anti-paralleled diode connect into full bridge structure.
4. a kind of DC voltage conversion device as claimed in any one of claims 1-3, it is characterised in that: the chopper circuit
Module is made of two full-controlled switch pipes and a current sharing inductor containing anti-paralleled diode, structure of connecting above and below two switching tubes
Input terminal at the half-bridge bridge arm of chopper circuit module as chopper circuit module, the midpoint of half-bridge bridge arm are concatenated with current sharing inductor
The output head anode of chopper circuit module is constituted afterwards, and the lower end of lower switch pipe is chopper circuit module negative pole of output end.
5. such as a kind of control method of DC voltage conversion device of any of claims 1-4, it is characterised in that:
A) under normal operation, the conducting of half-bridge module upper switch pipe, the shutdown of lower switch pipe, high-voltage end DC voltage is by series connection company
The switching tube of the isolated form DC/DC conversion module inverter direct-flow side shared connect, isolated form DC/DC conversion module unlocks fortune
Row, realizes the transmission of power, the upper switch pipe conducting of chopper circuit module, the shutdown of lower switch pipe, the bearing power of low-pressure end by
The isolated form DC/DC conversion module rectifier DC side being connected in parallel provides jointly；
B) when short trouble occurs in high-voltage end, isolated form DC/DC conversion module keeps unlock operating status, is exported by high-voltage end
Current closed-loop adjust strategy or Hysteresis control strategy, control the upper and lower switching tube of half-bridge module conducting dutycycle, by device to
The short-circuit current of short dot injection is limited within limits；
C) after fault clearance, half-bridge module upper switch pipe is restored to the on state under normal operation, lower switch
Pipe is restored to the off state under normal operation, and DC voltage conversion device completes the fast quick-recovery after fault clearance,
It realizes high-voltage end short trouble and passes through function.
6. a kind of control method of such as DC voltage conversion device of any of claims 1-4, it is characterised in that:
A) under normal operation, the conducting of half-bridge module upper switch pipe, the shutdown of lower switch pipe, high-voltage end DC voltage is by connecting
The isolated form DC/DC conversion module inverter direct-flow side shared of connection, the switching tube unlock of isolated form DC/DC conversion module
The transmission of power, the upper switch pipe conducting of chopper circuit module, the shutdown of lower switch pipe, the bearing power of low-pressure end are realized in operation
It is provided jointly by the isolated form DC/DC conversion module rectifier DC side being connected in parallel；
B) when short trouble occurs in low-pressure end, isolated form DC/DC conversion module keeps unlock operating status, is exported by low-pressure end
Current closed-loop adjust strategy or Hysteresis control strategy, control chopper circuit module switch pipe conducting dutycycle, by device to
The short-circuit current of short dot injection is limited within limits；
C) after fault clearance, chopper circuit module upper switch pipe is restored to the on state under normal operation, under
Switching tube is restored to the off state under normal operation, and DC voltage conversion device completes the fortune of the recovery after fault clearance
Row, realizes low-pressure end short trouble and passes through function.
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| CN201811144825.5A CN109256951B (en) | 2018-09-29 | 2018-09-29 | Direct-current voltage conversion device and control method thereof |
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| CN201811144825.5A CN109256951B (en) | 2018-09-29 | 2018-09-29 | Direct-current voltage conversion device and control method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336470A (en) * | 2019-07-09 | 2019-10-15 | 许继电气股份有限公司 | Electric power electric transformer system, transformer and its fault traversing control method |
| CN110677026A (en) * | 2019-07-25 | 2020-01-10 | 西安交通大学 | Double-active-bridge-structure-based fault current limiting topology and current limiting method for solid-state transformer |
| CN111245261A (en) * | 2020-03-11 | 2020-06-05 | 深圳供电局有限公司 | Low-voltage ride-through AC/DC converter and control method thereof |
| CN111669029A (en) * | 2020-07-14 | 2020-09-15 | 西南交通大学 | Fault reconstruction method for power electronic transformer system |
| CN113924721A (en) * | 2019-06-07 | 2022-01-11 | 松下知识产权经营株式会社 | Vehicle-mounted power supply system |
| CN114175432A (en) * | 2019-07-30 | 2022-03-11 | 宝马股份公司 | Vehicle onboard power supply system and method for protecting a vehicle onboard power supply system |
| US20220115957A1 (en) * | 2019-01-29 | 2022-04-14 | US Gov't as represented by Secretary of Air Force | High-bandwidth analog-controlled DC breaker on DC/DC converter with galvanic isolation |
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