CN109546674A - A kind of bridge-type direct current energy-consuming device and control method - Google Patents
A kind of bridge-type direct current energy-consuming device and control method Download PDFInfo
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- CN109546674A CN109546674A CN201811491666.6A CN201811491666A CN109546674A CN 109546674 A CN109546674 A CN 109546674A CN 201811491666 A CN201811491666 A CN 201811491666A CN 109546674 A CN109546674 A CN 109546674A
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- 238000005265 energy consumption Methods 0.000 claims abstract description 221
- 239000004065 semiconductor Substances 0.000 claims abstract description 122
- 239000003990 capacitor Substances 0.000 claims abstract description 48
- 230000015556 catabolic process Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention discloses a kind of bridge-type direct current energy-consuming device, including at least two bridge-types energy consumption module；Bridge-type energy consumption module is connected and composed by DC capacitor, the first energy consumption branch, the second energy consumption branch circuit parallel connection；First energy consumption branch routes the first power semiconductor and the first energy consumption resistor is connected in series and constitutes, and the tie point of the two, which is drawn, is used as the first exit；Second energy consumption branch routes the second power semiconductor and the second energy consumption resistor is connected in series and constitutes, and the tie point of the two, which is drawn, is used as the second exit；At least two bridge-types energy consumption equidirectional bridge-type direct current energy-consuming device in series of module.Invention additionally discloses a kind of control methods based on bridge-type direct current energy-consuming device, when AC line voltage increases, are moved back by the throwing that control power semiconductor controls energy consumption resistor, with stable DC voltage；When DC line short circuit, the first energy consumption resistor and the electric discharge series connection of the second energy consumption resistor, to limit DC capacitor electric current.Device cost performance is high, high reliablity, it is easy to accomplish.
Description
Technical field
The invention belongs to High Power Electronic Converter Technology fields, and in particular to a kind of bridge-type direct current energy-consuming device and control
Method processed.
Background technique
In HVDC transmission system, direct current energy-consuming device is vital equipment.Direct current energy-consuming device is mainly answered
For the application scenarios of generation of electricity by new energy conveying, if power generation end is the inertia power supply similar with wind-powered electricity generation, when event occurs for receiving end
When barrier, since power can not be sent out, the voltage of DC power transmission line will be caused to increase, to equipment in DC side cumlative energy
Safe operation causes damages.
Currently used technical solution is directly to be connected and concentrated using power semiconductor, such as IGBT in the prior art
Resistor proposal constitute, high pressure is born by IGBT valve string, lumped resistance consumes energy, and all IGBT are led simultaneously when the program works
Logical, the coherence request turned on and off to device is high, once appearance is inconsistent, will lead to part valve section over-voltage and burns, by
Shutdown can be constantly opened when work, the risk of device damage is very high.
There is technical solution to propose modular arrangement, but scheme there are number of devices more, at high cost, the low defect of reliability,
If patent CN102132484B is with the solution proposed in the converter of distributed brake resistances, as shown in Fig. 2, the program
The defect being primarily present is: the bridge arm current potential that diode is constituted is complicated: wherein the upper tube Yu proximity modules of diode bridge arm connect
It connecing, capacitor can not play clamping action to it, and in device operation, due to method of operation complexity, work between the modules not
When synchronous, the current potential between module is uncertain, and there are the risks of over-voltage breakdown for the diode；Meanwhile number of devices in the program
It is more, it altogether include 4 groups of power semiconductors, the failure rate and cost of entire module are higher；And in the module of the program
Contain two bridge arms being made of power semiconductor, there are current potential connections between bridge arm, increase the difficulty of structure design
Degree.
In order to overcome drawbacks described above, the present invention provides a kind of at low cost, high reliablity and solution.
Summary of the invention
To solve the above-mentioned problems, the invention proposes the controls of a kind of bridge-type direct current energy-consuming device and use above-mentioned apparatus
Method processed, device are connected in parallel between DC line, using the bridge-type energy consumption direct series system of module, reduce semiconductor devices
Dosage simplifies the design of energy-consuming device, is convenient for integral arrangement；It solves the problems, such as to press using modular arrangement；Using side
Road branch has ensured bypass reliability when bridge-type consumes energy module failure；Cooperate charging resistor, it can be achieved that bridge-type energy-consuming device
It is online throwing move back；In DC line fault, using the series connection of energy consumption resistor come limiting short-circuit current.Mentioned bridge-type direct current energy consumption
Device has the characteristics of at low cost, high reliablity.
In order to achieve the above objectives, the specific scheme that the present invention uses is as follows:
Described device includes at least two bridge-types energy consumption module；The bridge-type energy consumption module is by DC capacitor, the first energy consumption
Branch, the second energy consumption branch circuit parallel connection connect and compose；The first energy consumption branch routes the first power semiconductor and the first energy consumption
Resistance series connection connects and composes, and the tie point of the two, which is drawn, is used as the first exit, the other end and direct current of the first energy consumption resistor
Hold anode to be connected；The second energy consumption branch routes the second power semiconductor and the second energy consumption resistor is connected in series and constitutes, and two
The tie point of person, which is drawn, is used as the second exit, and one end of the second energy consumption resistor is separately connected with DC capacitor cathode；It is described at least
Two bridge-types energy consumption equidirectional bridge-type direct current energy-consuming devices in series of module, described bridge-type direct current energy-consuming device one end and direct current
High-potential electrode connection, the other end are connect with direct current low-potential electrode.
Wherein, the first by-pass switch in parallel between bridge-type energy consumption first exit of module and the second exit.
Wherein, first by-pass switch is mechanical switch or the solid-state switch that is made of power semiconductor.
Wherein, a protection semiconductor device in parallel between bridge-type energy consumption first exit of module and the second exit
Part, the device can actively be connected or passively puncture, and bridge-type is consumed energy module bypass.
Wherein, a bridge-type energy consumption module DC capacitor both ends equalizing resistance in parallel.
Wherein, the first power semiconductor in the bridge-type direct current energy-consuming device and the second power semiconductor are
Full-control type power semiconductor, the full-control type power semiconductor further includes anti-paralleled diode.
Wherein, the first energy consumption resistor in the bridge-type direct current energy-consuming device and the second energy consumption resistor both ends are respectively and union II
Pole pipe.
Wherein, direct current high-potential electrode and direct current are connected to after the bridge-type direct current energy-consuming device series connection one-way conduction unit
Between low-potential electrode, the one-way conduction unit is connected including at least two power semiconductors, the power semiconductor
The anti-and diode of device and the first semiconductor devices is arranged according to the current direction opposite direction allowed to flow through.
Wherein, a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: the bridge-type energy consumption mould
Block is using N group energy consumption branch, and N >=3, wherein the structure type of third energy consumption branch and the second energy consumption branch are identical, third
Consume energy branch and the second energy consumption branch circuit parallel connection, and the third energy consumption resistor in third energy consumption branch is in parallel with the second energy consumption resistor；When
When in the presence of more energy consumption branches, the first energy consumption branch and the second energy consumption branch both ends are successively parallel to by identical set mode.
Wherein, direct current height is connected to after bridge-type direct current energy-consuming device second by-pass switch of series connection and the first disconnecting switch
Between potential electrode and direct current low-potential electrode, the second by-pass switch both ends parallel connection pre-charge resistance.
The invention also includes a kind of control methods of bridge-type direct current energy-consuming device:
(1) when device starts, the control method be may include steps of:
Step 1: the power semiconductor shutdown in the bridge-type energy consumption module；
Step 2: as route DC voltage rises, the DC voltage at device both ends rises simultaneously；
Step 3: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
(2) the online investment of bridge-type direct current energy-consuming device, described method includes following steps:
Step 1: power semiconductor shutdown of the route DC voltage it has been established that the bridge-type consumes energy in module, institute
State the second by-pass switch disjunction, the first disconnecting switch disjunction；
Step 2: the first disconnecting switch of closure is charged by DC capacitor of the pre-charge resistance into bridge-type energy consumption module；
Step 3: when DC capacitor voltage is greater than a certain threshold value, being closed the second by-pass switch, pre-charge resistance is bypassed；
Step 4: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
(3) the online of bridge-type direct current energy-consuming device exits, and described method includes following steps:
Step 1: route DC voltage is it has been established that bridge-type energy consumption module DC capacitor voltage is at equilibrium；
Step 2: the power semiconductor in shutdown bridge-type energy consumption module, the first disconnecting switch of disjunction.
(4) the power semiconductor device when the DC line connecting with device operates normally, in the bridge-type energy consumption module
Part is in an off state；When DC line over-voltage, described method includes following steps:
Step 1: setting AC line voltage controls target upper limit value 1, and upper limit value 2, normal value, wherein upper limit value 2 is greater than
Upper limit value 1, upper limit value 1 are greater than normal value；
Step 2: when detecting that AC line voltage is more than upper limit value 1, in turning part or whole bridge-type energy consumption modules
The first power semiconductor or the second power semiconductor, until AC line voltage restore normal value, turn off bridge-type
The first power semiconductor or the second power semiconductor in the module that consumes energy；
Step 3: when detecting that AC line voltage is more than upper limit value 2, in turning part or whole bridge-type energy consumption modules
The first power semiconductor and the second power semiconductor；When AC line voltage declines and is restored to upper limit value 1,
Turn off the first power semiconductor or the second power semiconductor in bridge-type energy consumption module；When AC line voltage declines simultaneously
When being restored to normal value, the first power semiconductor and the second power semiconductor in shutdown bridge-type energy consumption module.
(5) when bridge-type energy consumption module breaks down, described method includes following steps:
Step 1: when detecting that bridge-type energy consumption module breaks down, turning off the first power semiconductor and the second power
Semiconductor devices；
Step 2: the first by-pass switch of closure, DC capacitor are discharged by the first energy consumption resistor and the second energy consumption resistor；
Step 3: failure bridge-type energy consumption module is bypassed by the first by-pass switch, and bridge-type direct current energy-consuming device continues to run.
(6) when short trouble occurs for DC line, described method includes following steps:
Step 1: when detecting that DC line breaks down, the first power semiconductor in shutdown bridge-type direct current energy consumption module
Device and the second power semiconductor；
Step 2: in bridge-type direct current energy-consuming device after all DC capacitor series connection, passing through the series connection of the first energy consumption resistor and second
Energy consumption resistor series loop discharges to DC line fault point；
Step 3: the second by-pass switch of disjunction, the first disconnecting switch of disjunction；
Step 4: after DC line fault is removed and voltage restores normal value, by step described in claim 11 by bridge-type
Direct current energy-consuming device is put into online.
Beneficial effects of the present invention:
1, bridge-type direct current energy-consuming device proposed by the present invention is connected in parallel between the high and low current potential of middle high-pressure DC line, is utilized
Device is split into each submodule by bridge-type energy consumption module, and each module includes DC capacitor, can bear line voltage distribution jointly,
Reduce the risk that power semiconductor in bridge-type energy consumption module bears overvoltage.
2, bridge-type energy consumption module proposed by the present invention is using two or more groups energy consumption branch, when the energy consumption branch for having more multiple groups
Lu Shi can be uniformly distributed and be parallel to the first and second energy consumption branches, then be then parallelly connected with DC capacitor both ends, pass by AC line
Energy consumption branch can be put into when pressure according to definite value rotation, single energy consumption branch is avoided and frequently puts into, causes energy consumption resistor heat tired
Long-pending and heat dissipation equipment increased costs, and increase the flexibility of control；Investment accelerates straight while multiple energy consumption branches
The velocity of discharge that galvanic electricity is held enhances the ability that energy-consuming device inhibits DC line overvoltage, can have in some extreme operating conditions
The guarantee converter station equipment safety of effect.
3, bridge-type energy consumption module proposed by the present invention is configured with by-pass switch, and in module failure, by-pass switch closes a floodgate.It will
Malfunctioning module excision when by-pass switch closes a floodgate, inhibits the discharge current of DC capacitor after the energy consumption resistor series connection for the branch that consumes energy,
It ensure that the reliability that by-pass switch closes a floodgate.
4, the energy consumption resistor of two energy consumption branches and DC capacitor are presented in bridge-type direct current energy-consuming device proposed by the present invention
Series relationship plays metering function in device starting, when device is put into online, can save pre- or reduction charging electricity
Resistance；In DC line short trouble, the energy consumption resistor in all bridge-type direct current energy consumption modules is connected, and limits DC capacitor to event
Hinder the discharge current of point.
5, bridge-type direct current energy-consuming device proposed by the present invention can also connect one-way conduction unit, and one-way conduction unit is concentrated
Arrangement, one-way conduction unit main function are when avoiding DC line short circuit, and capacitor group is discharged to fault point, plays protection
Diode is distributed across each consumption in traditional technology generally using diode as one way conducting device by the effect of isolation
Can be in module, main problem is: on the one hand, in energy-consuming device work, current potential between module is there are certain fluctuation, and two
There are over-voltage risks for pole pipe, and on the other hand, diode is dispersed in each module, it is difficult to be monitored and be managed, the present invention will
Diode centralized arrangement constitutes a diode valve string, and in valve section both ends parallel connection nonlinear resistance, avoids diode valve section
Overvoltage is born, concentrated protection can also be reduced compared with traditional scheme in overall quantity convenient for monitoring and management.
It 6, include power semiconductor in bridge-type of the invention energy consumption module, usually with anti-paralleled diode
IGBT, energy consumption resistor both ends parallel diode, energy consumption branch is directly concatenated where the power semiconductor in module, should
Series arm only includes power semiconductor, and contains all power semiconductors, can be pressed in structure design
Be fitted together, substantially reduce the volume of device, at the same advantageously ensure that device work consistency, and make between device etc.
Inductance value is imitated to reduce.
Detailed description of the invention
Fig. 1 is the topological diagram of bridge-type direct current energy-consuming device of the present invention.
Fig. 2 is the structure chart of prior art direct current energy-consuming device submodule.
Fig. 3 is that bridge-type of the present invention consumes energy module containing the structure chart for protecting power semiconductor.
Fig. 4 is the first embodiment of bridge-type direct current energy-consuming device of the present invention.
Fig. 5 is the second embodiment of bridge-type direct current energy-consuming device of the present invention.
Fig. 6 is the 3rd embodiment of bridge-type direct current energy-consuming device of the present invention.
Fig. 7 is the fourth embodiment of bridge-type direct current energy-consuming device of the present invention.
Fig. 8 is the 5th embodiment of bridge-type direct current energy-consuming device of the present invention.
Figure label title: 1, bridge-type direct current energy-consuming device；2, bridge-type energy consumption module；3, the first disconnecting switch；4, second
By-pass switch；5, pre-charge resistance；6, one-way conduction unit；7, nonlinear resistance；21, the first by-pass switch；22, direct current
Hold；23, the first power semiconductor；24, the second power semiconductor；25, the first energy consumption resistor；26, the first energy consumption electricity
Hinder parallel diode；27, the second energy consumption resistor；28, the second energy consumption resistor parallel diode；29, semiconductor devices is protected.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
As shown in Figure 1, a kind of bridge-type direct current energy-consuming device 1 of the present invention includes at least two bridge-types energy consumption module 2, the bridge
Formula energy consumption module is connected and composed by DC capacitor, the first energy consumption branch, the second energy consumption branch circuit parallel connection；The first energy consumption branch routing
First power semiconductor and the first energy consumption resistor, which are connected in series, to be constituted, and the tie point of the two, which is drawn, is used as the first exit,
The other end of first energy consumption resistor is connected with DC capacitor anode；It is described second energy consumption branch route the second power semiconductor with
Second energy consumption resistor, which is connected in series, to be constituted, and the tie point of the two, which is drawn, is used as the second exit, the other end of the second energy consumption resistor
It is connected with DC capacitor cathode；At least two bridge-types energy consumption equidirectional bridge-type direct current energy-consuming device in series of module, institute
It states bridge-type direct current energy-consuming device one end to connect with direct current high-potential electrode, the other end is connect with direct current low-potential electrode.
Fig. 3 is the structure chart of this bridge-type energy consumption module 2 power semiconductor containing protection.
Wherein, a protection semiconductor device in parallel between bridge-type energy consumption 2 first exit of module and the second exit
Part, the device can actively be connected or passively puncture, and bridge-type is consumed energy module bypass.
In the present embodiment, the anode of semiconductor devices is protected to connect with bridge-type energy consumption the first exit of module, cathode and bridge
Formula energy consumption the second exit of module connection, when bridge-type energy consumption module breaks down, active trigger protection semiconductor devices, direct current
Capacitor burns protection semiconductor by the first energy consumption resistor, the second energy consumption resistor, the series loop short circuit for protecting semiconductor devices
Device, the bridge-type energy consumption module of effective bypass failure.
In the present embodiment, cathode can also be connect by protection semiconductor devices with bridge-type energy consumption the first exit of module, sun
Pole is connect with bridge-type energy consumption the second exit of module, and when bridge-type energy consumption module breaks down, DC capacitor voltage is constantly increased,
Until breakdown protection semiconductor devices, DC capacitor passes through the first energy consumption resistor, the second energy consumption resistor, protects semiconductor devices
Series loop electric discharge, the bridge-type energy consumption module of effective bypass failure.
Fig. 4 is the first embodiment that bridge-type direct current energy-consuming device 1 of the present invention works.
Wherein, the first power semiconductor in the bridge-type energy consumption module 2 and the second power semiconductor are complete
Control type power semiconductor, the full-control type power semiconductor further includes anti-paralleled diode.
Wherein, the first energy consumption resistor in bridge-type energy consumption module 2 and the second energy consumption resistor both ends simultaneously union II pole respectively
Pipe.
The bridge-type direct current energy-consuming device 1 can put into energy consumption branch in DC line over-voltage according to definite value rotation, avoid
Single energy consumption branch is frequently put into, and causes the increased costs of energy consumption resistor accumulation of heat and heat dissipation equipment, and increase control
The flexibility of system；Investment accelerates the velocity of discharge of DC capacitor while multiple energy consumption branches,
When the DC line connecting with device operates normally, at the power semiconductor in the bridge-type energy consumption module
In off state；When DC line over-voltage, include the following steps:
Step 1: setting AC line voltage controls target upper limit value 1, and upper limit value 2, normal value, wherein upper limit value 2 is greater than
Upper limit value 1, upper limit value 1 are greater than normal value；
Step 2: when detecting that AC line voltage is more than upper limit value 1, in turning part or whole bridge-type energy consumption modules
The first power semiconductor or rotation the first power semiconductor and the second power semiconductor is connected, until straight
Flow Line voltage restores normal value, the first power semiconductor and the second power semiconductor device in shutdown bridge-type energy consumption module
Part；
Step 3: when detecting that AC line voltage is more than upper limit value 2, in turning part or whole bridge-type energy consumption modules
The first power semiconductor and the second power semiconductor；When AC line voltage declines and is restored to upper limit value 1,
Turn off the first power semiconductor or the second power semiconductor in bridge-type energy consumption module；When AC line voltage declines simultaneously
When being restored to normal value, the first power semiconductor and the second power semiconductor in shutdown bridge-type energy consumption module.
In the present embodiment, when DC line over-voltage, into energy consumption mode.Set the upper limit value 1 of voltage control target
For 420kV, upper limit value 2 is 440kV, normal value 400kV.
The first function when detecting that AC line voltage is more than 420kV, in turning part or whole bridge-type energy consumption modules
Rate semiconductor devices, electric current flow through the first energy consumption resistor as shown in figure 3, due to energy consumption resistor investment, energy is consumed, direct current
The variation of voltage value depends on the speed of energy accumulation and the speed of consumption.In order to reduce the heat consumption of the first energy consumption resistor,
The first power semiconductor and the second power semiconductor can also be connected by some cycles rotation, electric current flows through the at this time
One energy consumption resistor or the second energy consumption resistor, as shown in Figure 3.
If the energy velocity of accumulation is greater than the speed of consumption, DC voltage continues to rise, and DC voltage is more than
440kV, at this point, the first power semiconductor and the second power semiconductor device in turning part or whole bridge-type energy consumption modules
Part, electric current flow through the first energy consumption resistor and the second energy consumption resistor, as shown in Figure 3.When AC line voltage declines and is restored to
When 420kV, the first power semiconductor or the second power semiconductor in shutdown bridge-type energy consumption module；When DC line electricity
Drops and when being restored to 400kV, the first power semiconductor and the second power semiconductor device in shutdown bridge-type energy consumption module
Part.
Fig. 5 is the second embodiment of bridge-type direct current energy-consuming device 1 of the present invention.
Wherein, the first by-pass switch in parallel between bridge-type energy consumption first exit of module and the second exit.
Wherein, first by-pass switch is mechanical switch or the solid-state switch that is made of power semiconductor.
In the present embodiment, bridge-type energy consumption module 201 breaks down, and described method includes following steps:
Step 1: when detecting that bridge-type energy consumption module 201 breaks down, turning off its first power semiconductor and the
Two power semiconductors；
Step 2: closure bridge-type energy consumption 201 first by-pass switch of module, DC capacitor pass through the first energy consumption resistor and second
Energy consumption resistor electric discharge；
Step 3: failure bridge-type consumes energy module 201 by the bypass of the first by-pass switch, and bridge-type direct current energy-consuming device 1 is after reforwarding
Row.
In the present embodiment, when short trouble occurs for DC line, described method includes following steps:
Step 1: when detecting that DC line breaks down, first power is partly led in shutdown bridge-type direct current energy consumption module 2
Body device and the second power semiconductor；
Step 2: in bridge-type direct current energy-consuming device 1 after the series connection of all DC capacitors, passing through the series connection of the first energy consumption resistor and the
Two energy consumption resistor series loops discharge to DC line fault point.
Fig. 6 is the 3rd embodiment of bridge-type direct current energy-consuming device 1 of the present invention.
In the present embodiment, bridge-type direct current energy-consuming device 1 uses 3 groups of energy consumption branches, wherein the structure shape of third energy consumption branch
Formula is identical with the second energy consumption branch, third energy consumption branch and the second energy consumption branch circuit parallel connection, the third in third energy consumption branch
Energy consumption resistor is in parallel with the second energy consumption resistor.
It, can be successively in parallel by identical set mode when there is more energy consumption branches in bridge-type direct current energy-consuming device 1
In the first energy consumption branch and the second energy consumption branch both ends.
Fig. 7 is the fourth embodiment of bridge-type direct current energy-consuming device 1 of the present invention.
Wherein, direct current is connected to after second by-pass switch of series connection of bridge-type direct current energy-consuming device 1 and the first disconnecting switch
Between high-potential electrode and direct current low-potential electrode, the second by-pass switch both ends parallel connection pre-charge resistance.
In the present embodiment, bridge-type direct current energy-consuming device 1 can be put into online, and method includes the following steps:
Step 1: power semiconductor shutdown of the route DC voltage it has been established that the bridge-type consumes energy in module, institute
State the second by-pass switch disjunction, the first disconnecting switch disjunction；
Step 2: the first disconnecting switch of closure is charged by DC capacitor of the pre-charge resistance into bridge-type energy consumption module；
Step 3: when DC capacitor voltage is greater than a certain threshold value, being closed the second by-pass switch, pre-charge resistance is bypassed；
Step 4: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
In the present embodiment, bridge-type direct current energy-consuming device 1 can exit online, and method includes the following steps:
Step 1: route DC voltage is it has been established that bridge-type energy consumption module DC capacitor voltage is at equilibrium；
Step 2: the power semiconductor in shutdown bridge-type energy consumption module, the first disconnecting switch of disjunction.
Fig. 8 is the 5th embodiment of bridge-type direct current energy-consuming device 1 of the present invention.
Wherein, direct current high-potential electrode and direct current are connected to after the bridge-type direct current energy-consuming device series connection one-way conduction unit
Between low-potential electrode, the one-way conduction unit is connected including at least two power semiconductors, the power semiconductor
The anti-and diode of device and the first semiconductor devices is arranged according to the current direction opposite direction allowed to flow through.
Wherein, one-way conduction unit both ends one or more concatenated nonlinear resistances in parallel, can also be by one-way conduction
Unit is divided into several groups, respectively nonlinear resistance in parallel, plays the role of limiting one-way conduction unit overvoltage.
In the present embodiment, one-way conduction unit prevents in bridge-type direct current energy-consuming device 1 all DC capacitors to AC line
The electric discharge of road fault point.
The invention also includes a kind of control methods of direct current energy-consuming device:
A, method 1: device is completed to start together with inverter, includes the following steps:
Step 1: the power semiconductor shutdown in the bridge-type energy consumption module；
Step 2: as route DC voltage rises, the DC voltage at device both ends rises simultaneously；
Step 3: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
B, method 2, using in device carry charge circuit, include the following steps:
Step 1: power semiconductor shutdown of the route DC voltage it has been established that the bridge-type consumes energy in module, institute
State the second by-pass switch disjunction, the first disconnecting switch disjunction；
Step 2: the first disconnecting switch of closure is charged by DC capacitor of the pre-charge resistance into bridge-type energy consumption module；
Step 3: when DC capacitor voltage is greater than a certain threshold value, being closed the second by-pass switch, pre-charge resistance is bypassed；
Step 4: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
The above examples are only used to illustrate the technical scheme of the present invention rather than its limitations, carries out referring to above-described embodiment
Various forms is modified or is changed within the scope of the present invention.
Claims (17)
1. a kind of bridge-type direct current energy-consuming device, which is characterized in that described device includes at least two bridge-types energy consumption module；The bridge
Formula energy consumption module is connected and composed by DC capacitor, the first energy consumption branch, the second energy consumption branch circuit parallel connection；The first energy consumption branch routing
First power semiconductor and the first energy consumption resistor, which are connected in series, to be constituted, and the tie point of the two, which is drawn, is used as the first exit,
The other end of first energy consumption resistor is connected with DC capacitor anode；It is described second energy consumption branch route the second power semiconductor with
Second energy consumption resistor, which is connected in series, to be constituted, and the tie point of the two, which is drawn, is used as the second exit, the other end of the second energy consumption resistor
It is connected with DC capacitor cathode；At least two bridge-types energy consumption equidirectional bridge-type direct current energy-consuming device in series of module, institute
It states bridge-type direct current energy-consuming device one end to connect with direct current high-potential electrode, the other end is connect with direct current low-potential electrode.
2. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: the bridge-type energy consumption module first is drawn
First by-pass switch in parallel between outlet and the second exit.
3. a kind of bridge-type direct current energy-consuming device as claimed in claim 2, it is characterised in that: first by-pass switch is mechanical
Switch or the solid-state switch being made of power semiconductor.
4. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: the bridge-type energy consumption module first is drawn
A protection semiconductor devices in parallel between outlet and the second exit, the device actively conducting or passive breakdown, bridge-type is consumed
It can module bypass.
5. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: the bridge-type energy consumption module direct current
Hold a both ends equalizing resistance in parallel.
6. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: in the bridge-type direct current energy-consuming device
The first power semiconductor and the second power semiconductor be full-control type power semiconductor, the full-control type power
Semiconductor devices further includes anti-paralleled diode.
7. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: in the bridge-type direct current energy-consuming device
The first energy consumption resistor and the second energy consumption resistor both ends distinguish parallel diode.
8. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: the bridge-type direct current energy-consuming device string
It is connected between direct current high-potential electrode and direct current low-potential electrode after connection one-way conduction unit, the one-way conduction unit includes
The series connection of at least two power semiconductors, the anti-and diode of the power semiconductor and the first semiconductor devices according to
The current direction opposite direction arrangement allowed to flow through.
9. a kind of bridge-type direct current energy-consuming device as described in claim 1, it is characterised in that: the bridge-type energy consumption module uses N
Group energy consumption branch, N >=3, wherein the structure type of third energy consumption branch is identical with the second energy consumption branch, third energy consumption branch
With second energy consumption branch circuit parallel connection, third consume energy branch in third energy consumption resistor it is in parallel with the second energy consumption resistor；It is more when existing
Energy consumption branch when, by identical set mode be successively parallel to the first energy consumption branch and second energy consumption branch both ends.
10. a kind of bridge-type direct current energy-consuming device as described in any one of claim 1 to 9, it is characterised in that: the bridge-type direct current
Direct current high-potential electrode and direct current low-potential electrode are connected to after energy-consuming device the second by-pass switch of series connection and the first disconnecting switch
Between, the second by-pass switch both ends parallel connection pre-charge resistance.
11. a kind of control method based on any one of the claim 1-10 bridge-type direct current energy-consuming device, it is characterised in that: when
When device starts, described method includes following steps:
Step 1: the power semiconductor shutdown in the bridge-type energy consumption module；
Step 2: as route DC voltage rises, the DC voltage at device both ends rises simultaneously；
Step 3: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
12. a kind of online input control method based on bridge-type direct current energy-consuming device described in claim 10, it is characterised in that: institute
The method of stating includes the following steps:
Step 1: route DC voltage is it has been established that power semiconductor shutdown in bridge-type energy consumption module, and described the
Two by-pass switch disjunctions, the first disconnecting switch disjunction；
Step 2: the first disconnecting switch of closure is charged by DC capacitor of the pre-charge resistance into bridge-type energy consumption module；
Step 3: when DC capacitor voltage is greater than a certain threshold value, being closed the second by-pass switch, pre-charge resistance is bypassed；
Step 4: utilizing the voltage of capacitor in the balanced each bridge-type energy consumption module of energy consumption branch.
13. a kind of online withdrawal control method based on bridge-type direct current energy-consuming device described in claim 10, it is characterised in that: institute
The method of stating includes the following steps:
Step 1: route DC voltage is it has been established that bridge-type energy consumption module DC capacitor voltage is at equilibrium；
Step 2: the power semiconductor in shutdown bridge-type energy consumption module, the first disconnecting switch of disjunction.
14. a kind of control method based on any one of the claim 1-10 bridge-type direct current energy-consuming device, it is characterised in that: when
When the DC line connecting with device operates normally, the power semiconductor in the bridge-type energy consumption module is off shape
State；When DC line over-voltage, described method includes following steps:
Step 1: setting AC line voltage controls target upper limit value 1, and upper limit value 2, normal value, wherein upper limit value 2 is greater than the upper limit
Value 1, upper limit value 1 are greater than normal value；
Step 2: when detecting that AC line voltage is more than upper limit value 1, in turning part or whole bridge-type energy consumption module the
One power semiconductor or the second power semiconductor, until AC line voltage restores normal value, shutdown bridge-type energy consumption
The first power semiconductor or the second power semiconductor in module；
Step 3: when detecting that AC line voltage is more than upper limit value 2, in turning part or whole bridge-type energy consumption module the
One power semiconductor and the second power semiconductor；When AC line voltage declines and is restored to upper limit value 1, shutdown
First power semiconductor or the second power semiconductor in bridge-type energy consumption module；When AC line voltage declines and restores
When to normal value, the first power semiconductor and the second power semiconductor in shutdown bridge-type energy consumption module.
15. a kind of control method based on bridge-type direct current energy-consuming device described in claim 2, it is characterised in that；When bridge-type consumes energy
When module breaks down, described method includes following steps:
Step 1: when detecting that bridge-type energy consumption module breaks down, turning off the first power semiconductor and the second power is partly led
Body device；
Step 2: the first by-pass switch of closure, DC capacitor are discharged by the first energy consumption resistor and the second energy consumption resistor；
Step 3: failure bridge-type energy consumption module is bypassed by the first by-pass switch, and bridge-type direct current energy-consuming device continues to run.
16. a kind of control method based on any one of the claim 1-9 bridge-type direct current energy-consuming device, it is characterised in that；When
When short trouble occurs for DC line, described method includes following steps:
Step 1: when detecting that DC line breaks down, the first power semiconductor in shutdown bridge-type direct current energy consumption module
With the second power semiconductor；
Step 2: in bridge-type direct current energy-consuming device after all DC capacitor series connection, passing through the series connection of the first energy consumption resistor and the second energy consumption
Resistance series loop discharges to DC line fault point.
17. a kind of control method based on bridge-type direct current energy-consuming device described in claim 10, it is characterised in that；Work as DC line
When short trouble occurs, described method includes following steps:
Step 1: when detecting that DC line breaks down, the first power semiconductor in shutdown bridge-type direct current energy consumption module
With the second power semiconductor；
Step 2: in bridge-type direct current energy-consuming device after all DC capacitor series connection, passing through the series connection of the first energy consumption resistor and the second energy consumption
Resistance series loop discharges to DC line fault point；
Step 3: the second by-pass switch of disjunction, the first disconnecting switch of disjunction；
Step 4: after DC line fault is removed and voltage restores normal value, bridge-type direct current energy-consuming device being put into online.
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