CN205509845U - Quick isolating device of MMC direct current trouble - Google Patents
Quick isolating device of MMC direct current trouble Download PDFInfo
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- CN205509845U CN205509845U CN201620246524.3U CN201620246524U CN205509845U CN 205509845 U CN205509845 U CN 205509845U CN 201620246524 U CN201620246524 U CN 201620246524U CN 205509845 U CN205509845 U CN 205509845U
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims description 8
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- 238000005070 sampling Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 238000002955 isolation Methods 0.000 abstract description 8
- 230000009194 climbing Effects 0.000 abstract description 6
- 230000005540 biological transmission Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000001629 suppression Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 241001672018 Cercomela melanura Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model relates to a quick isolating device of MMC direct current trouble, but include switch -off power device valve section and the impedance unit that comprises resistance device and inductance component, this valve section comprises at least one power device, but the impedance unit is parallelly connected with switch -off power device valve section. This impedance unit not only has the effect of the current -limiting of resistance to and the effect of absorption short circuit energy, guarantee that fault current attenuates fast, so that take failure isolation measure on next step as early as possible, and the inductance element in the impedance unit can restrain short -circuit current's climbing, avoids fault current's slewing rate too big to reduction fault current charges to system device's, makes system device protected effectively, and help MMC system is resumeed after the direct current trouble fast.
Description
Technical field
This utility model relates to a kind of MMC DC Line Fault and quickly isolates device, belongs to power system and electric power
Electronics flexible direct current converter valve field.
Background technology
Flexible direct current power transmission system based on MMC controls flexibly, it is possible to realize meritorious, idle independence solution
Coupling controls, at large-scale distributed new-energy grid-connected, urban electricity supply, island with power, power grid"black-start", many
The end field such as DC online, weak systems connection has very big market application prospect.Current domestic existing multiple
MMC topological structure application project.
Direct-current short circuit fault is a kind of catastrophe failure type that must take into during inverter design is run, either
Temporary or permanent fault, the measure that MMC system generally uses is locking converter valve tripping exchange
Chopper, especially for Multi-end flexible direct current transmission system, if there is DC bipolar short trouble in one end,
Other multiterminal also can constitute DC bipolar short trouble by this end system trouble point simultaneously, causes multi-terminal system
In succession stop transport, have a strong impact on system power supply quality.For reduce DC Line Fault probability of happening, the most put into operation or
Positive construction project all uses cable run, and this makes flexible DC power transmission engineering economy cost be greatly increased.
Flexible direct current power transmission system DC Line Fault crossing technology is divided into employing with quickly isolating technology path at present
Possess the submodule topology of DC Line Fault ride-through capability and the development of dc circuit breaker.But use and possess direct current
The submodule topology cost of fault ride-through capacity at least to double than current half-bridge sub modular structure cost,
And the development of dc circuit breaker is limited by device for high-power power electronic manufacturing technology level, in the short time
Critical breakthrough cannot be realized.In order to overcome the problems referred to above, in Application No. 201410848005.X
State's patent application discloses a kind of isolation scheme being adapted to semibridge system MMC DC Line Fault, and it includes one
There is the MMC inverter improved structure of DC Line Fault current limiting capacity, be provided with in each brachium pontis of inverter
Current limliting module, this current limliting module includes the power cell being made up of at least one power device, and current limliting electricity
Resistance, power cell and current-limiting resistance are in parallel, when DC Line Fault occurs, control power cell and turn off, now
Fault current flows through current-limiting resistance, and current-limiting resistance plays the effect of failure current limit.But, this current limliting module is only
The effect of current limliting can be played when fault occurs, when the rate of change of fault current is bigger, this current-limiting resistance without
Method plays the effect reducing rate of change, and then cannot reduce the fault current impact to system equipment, can damage
System equipment.
Utility model content
The purpose of this utility model is to provide a kind of MMC DC Line Fault and quickly isolates device, in order to solve limit
Leakage resistance cannot reduce the fault current problem to the impact of system equipment.
For achieving the above object, scheme of the present utility model includes that a kind of MMC DC Line Fault quickly isolates dress
Put, including can switch-off power device valve section, this valve section is made up of at least one power cell, described isolation dress
Putting the impedance unit also including being made up of resistance device and inductance component, described impedance unit turns off with described
Power device valve section is in parallel.
Described isolating device also includes Absorption Capacitance unit, described Absorption Capacitance unit with described can switch-off power
Device valve section is in parallel.
Described isolating device also includes by-pass switch, described by-pass switch with described can switch-off power device valve section
In parallel.
Described isolating device also includes that control module, the sampling of described control module connect described Absorption Capacitance, institute
Stating control module and connect described power device by driving module to control, the control of described control module connects described
By-pass switch.
Described impedance unit is made up of an inductance and at least one resistant series.
Described Absorption Capacitance unit is made up of an Absorption Capacitance or by least two Absorption Capacitance series connection structure
Become.
Described power cell is a power device or is made up of the series connection of at least two power device.
Described isolating device also include for the DC capacitor power taking from MMC submodule take can unit,
Described taking can supply to electrically connect described control module by unit.
Described power device is also correspondingly arranged protected branch road, and described protection branch road is with corresponding power device also
Connection is arranged, and on described protection branch road, string is provided with protective resistance and protection electric capacity, described protective resistance and a guarantor
Protect diodes in parallel.
Described power device is GTO, IGBT, IEGT or IGCT.
The MMC DC Line Fault that this utility model provides quickly isolates device and includes impedance unit, this impedance list
Unit is made up of resistive element and inductance element, so, this impedance unit not only has the effect of the current limliting of resistance,
And absorb the effect of short circuit energy, it is ensured that fault current rapid decay, in order to take next step fault as early as possible
Quarantine measures；And, the inductance element in impedance unit can suppress the climbing of short circuit current, it is to avoid therefore
The rate of change of barrier electric current is excessive, thus reduces the charging of fault current and system equipment, makes system equipment obtain
Effectively protect, help MMC system fast quick-recovery after DC Line Fault.
Accompanying drawing explanation
Fig. 1 is that MMC DC Line Fault quickly isolates device overall structure schematic diagram；
Fig. 2 is the annexation figure between isolating device and MMC submodule；
Fig. 3 is the detail of construction that MMC DC Line Fault quickly isolates device；
Fig. 4 is the control flow chart of isolating device；
Fig. 5 is the annexation schematic diagram of multiple isolating device.
Detailed description of the invention
The utility model is described in more detail below in conjunction with the accompanying drawings.
Embodiment 1
As depicted in figs. 1 and 2, MMC DC Line Fault quickly isolates device serial connection in MMC system
On brachium pontis, it is arranged in series with the MMC submodule on this brachium pontis, and this isolating device is particularly suited for
Semibridge system MMC system.
This MMC DC Line Fault quickly isolate device include by-pass switch 1, can switch-off power device valve section 2,
Impedance unit 3 and Absorption Capacitance unit 4, this four part is parallel relationship.
Switch-off power device valve section 2 (can include that inverter transmits according to the power system capacity of MMC system
Capacity and AC system capacity of short circuit) and DC voltage level and be made up of one or more snippets valve, and each
The quantity of valve Duan Zhongke switch-off power device can be 1, it is also possible to be n (n is more than or equal to 2,
Depending on n is according to MMC system voltage grade), as shown in Figure 3.
Can valve hop count amount (m) in switch-off power device valve section 2 depend on single DC Line Fault quickly every
From valve group put into moment valve group two ends pressure-bearing (Uf), valve Duan Zhongke switch-off power device pressure-bearing (Usm) with
Can the quantity (n) of switch-off power device, be specifically represented by:
M=Uf/(n×Usm)。
It addition, can switch-off power device valve section 2 comprise can switch-off power device can be GTO, IGBT,
IEGT and IGCT etc. numerous can one or more series-parallel connections composition in switch-off power device, and be not limited to
A certain.It is to say, can switch-off power device valve section 2 by one or more power devices above-mentioned connect structure
Become.
In a word, can switch-off power device valve section 2 be connected structure by a power device or at least two power device
Becoming, the concrete number arranged and choosing of type of device can select according to practical situation.
In order to protect each power device, each power device is all parallel with a protection
Road, as it is shown on figure 3, protection branch road is arranged in parallel with corresponding power device, on protection branch road, string is provided with guarantor
Protect resistance and protection electric capacity, protective resistance and a protection diodes in parallel.
Impedance unit 3 is made up of resistance device and inductance component, wherein resistance device and the number of inductance component
It is configured as the case may be, such as: include a resistance and an inductance, or multiple resistance is with many
Individual inductance, or a resistance and multiple inductance, then or an inductance and multiple resistance；And inductance and
Annexation between resistance can carry out series, parallel as required or series-parallel forms, concrete
Join the value power system capacity (including inverter transmission capacity and AC system capacity of short circuit) according to MMC system
And DC voltage level determines.As it is shown on figure 3, give a specific embodiment, impedance unit 3 is by many
Individual resistance and an inductance are in series.Choosing of inductance value depends on that MMC brachium pontis submodule valve module is pacified
Full tolerance range and converter valve locking moment bridge arm current instantaneous value.It is permissible that impedance unit 3 seals in short-circuit loop
Limiting short-circuit current amplitude, suppression short circuit current climbing and quickly absorb short circuit energy, thus shorten fault
Fault Isolation condition reaches the time, and wherein, resistance plays current limliting, and the effect of absorption short circuit energy, protects
Card fault current rapid decay；Inductance can suppress the climbing of short circuit current, it is to avoid the change of fault current
Rate is excessive.
By-pass switch 1 controls switch for high speed machine switch or other relay etc..
The Absorption Capacitance unit 4 peak voltage in absorption circuit, reaches the effect of mild voltage pulsation.
This capacitor cell can be made up of an Absorption Capacitance；Can also be in series by least two Absorption Capacitance,
As shown in Figure 3.
In order to control effectively by-pass switch 1 and valve section 2, this isolating device is additionally provided with control module,
This control module can be existing control chip, such as: single-chip microcomputer, according to its internal software program arranged
Realize the function of correspondence.
MMC system is monitored by Control protection system in MMC system in real time, when direct-current short circuit event occur
During barrier, this Control protection system sends the control signal of correspondence, and control module receives this control signal and by driving
Dynamic model block drives that control can power component action message in switch-off power device valve section 2.This control module
Also sampling connects Absorption Capacitance unit 4, controls to connect by-pass switch 1.
It addition, in order to valve section and control module are powered, this isolating device is provided with power taking unit,
This takes can power link control module by unit.This power taking unit can be DC/DC module, and it is from adjacent
DC capacitor power taking in MMC submodule, then flows to control module by electric energy, as in figure 2 it is shown,
Two arrows in Fig. 2 represent electric energy and carry out power taking from adjacent submodule.
This MMC DC Line Fault quickly isolates device two states in systems, and one is excision state,
Another kind is input state.Excision state refers to be in opening state by switch-off power device, puts into state
Finger can be off state by switch-off power device.When this isolating device is in excision state, at MMC system
Under normal operating condition；When this isolating device is in input state, MMC system is in malfunction
Under.
When MMC system is properly functioning, MMC DC Line Fault quickly isolates device and is in normal operating condition,
Power device T (T1, T2 ..., Tn) is in the conduction state, and T and anti-paralleled diode thereof lead to respectively
Cross the forward and reverse electric current of brachium pontis.
After Control protection system detects that direct-current short circuit fault occurs, it is immediately performed MMC converter valve locking,
This belongs to prior art, no longer describes in detail；Meanwhile, Control protection system controls letter to control module one
Number, control module turns off by driving module to control power device T (T1, T2 ..., Tn), impedance
Unit puts in fault loop, thus limits the bridge arm current that flexible DC power transmission DC side fault causes and cross stream
Peak value, and shorten fault current die-away time.As other embodiment, this control module can also be straight
Connect detection direct-current short circuit fault, then by driving module to control power device T (T1, T2 ..., Tn)
Turn off.
It addition, control module detects the voltage at capacitor cell two ends in real time, the voltage at capacitor cell two ends is for being somebody's turn to do
The voltage at isolating device two ends, when owing to occurring that emergency case or failure condition cause capacitor cell two ends
During overtension, control module issues by-pass switch close command immediately, by by-pass switch this isolation of short circuit
Device, to avoid this isolating device to damage.
Fig. 4 is the control flow chart of this isolating device.
It addition, can also arrange multiple isolating device on MMC brachium pontis, annexation is as shown in Figure 5.
In above-described embodiment, isolating device is provided with control module, realizes isolation dress according to this control module
Putting excision and put into and the control of Absorption Capacitance overvoltage, as other embodiment, this control module is permissible
It is not provided with, and uses the original related control device in MMC system to carry out isolating device excision and throwing
Enter and the control of Absorption Capacitance overvoltage.
Embodiment 2
This embodiment is with the difference of embodiment 1: isolating device is not related to Absorption Capacitance unit 4 and bypass
Switch 1, then, control module also cannot be sampled and be connected Absorption Capacitance unit, controls to connect by-pass switch,
The most just cannot be carried out the control of overvoltage.So, the isolating device in the present embodiment does not carry out Absorption Capacitance two ends
The detection of voltage and the control of by-pass switch, only carry out following control: utilize the inductance in impedance unit and electricity
Resistance realizes limiting short-circuit current amplitude, suppression short circuit current climbing and quickly absorbs short circuit energy, thus contracts
Short fault Fault Isolation condition reaches the purpose of time.
Embodiment 3
This embodiment is with the difference of embodiment 1: isolating device is not related to by-pass switch 1, then, should
Control device and cannot be carried out the control of overvoltage.So, the isolating device in the present embodiment does not carry out Absorption Capacitance
The detection of both end voltage and the control of by-pass switch, only carry out following control: utilize the inductance in impedance unit
Realize limiting short-circuit current amplitude, suppression short circuit current climbing with resistance and quickly absorb short circuit energy, profit
Carry out the absorption of peak voltage with capacitor cell, thus shorten fault Fault Isolation condition and reach the mesh of time
's.
It is presented above specific embodiment, but this utility model is not limited to described embodiment.
Basic ideas of the present utility model are above-mentioned basic scheme, for those of ordinary skill in the art, according to
Teaching of the present utility model, designs the model of various deformation, formula, parameter are not required to spend creativeness
Work.The change that in the case of without departing from principle of the present utility model and spirit, embodiment carried out, repair
Change, replace and modification still falls within protection domain of the present utility model.
Claims (10)
1. MMC DC Line Fault quickly isolates a device, including can switch-off power device valve section, this valve
Section is made up of at least one power cell, it is characterised in that described isolating device also include by resistance device and
Inductance component constitute impedance unit, described impedance unit with described can switch-off power device valve section in parallel.
MMC DC Line Fault the most according to claim 1 quickly isolates device, it is characterised in that
Described isolating device also includes Absorption Capacitance unit, described Absorption Capacitance unit with described can switch-off power device
Valve section is in parallel.
MMC DC Line Fault the most according to claim 2 quickly isolates device, it is characterised in that
Described isolating device also includes by-pass switch, described by-pass switch with described can switch-off power device valve section also
Connection.
MMC DC Line Fault the most according to claim 3 quickly isolates device, it is characterised in that
Described isolating device also includes that control module, the sampling of described control module connect described Absorption Capacitance, described control
Molding block is by driving module to control to connect described power device, and described control module controls to connect described bypass
Switch.
5. quickly isolating device according to the MMC DC Line Fault described in claim 1-4 any one, it is special
Levying and be, described impedance unit is made up of an inductance and at least one resistant series.
6. quickly isolating device according to the MMC DC Line Fault described in claim 2-4 any one, it is special
Levying and be, described Absorption Capacitance unit is made up of an Absorption Capacitance or is connected by least two Absorption Capacitance
Constitute.
7. quickly isolating device according to the MMC DC Line Fault described in claim 1-4 any one, it is special
Levying and be, described power cell is a power device or is made up of the series connection of at least two power device.
MMC DC Line Fault the most according to claim 4 quickly isolates device, it is characterised in that
Described isolating device also include for the DC capacitor power taking from MMC submodule take can unit, described
Take and can supply to electrically connect described control module by unit.
MMC DC Line Fault the most according to claim 7 quickly isolates device, it is characterised in that
Described power device is also correspondingly arranged protected branch road, and described protection branch road sets with corresponding power device parallel connection
Putting, on described protection branch road, string is provided with protective resistance and protection electric capacity, described protective resistance and a protection two
Pole pipe is in parallel.
MMC DC Line Fault the most according to claim 7 quickly isolates device, it is characterised in that
Described power device is GTO, IGBT, IEGT or IGCT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620246524.3U CN205509845U (en) | 2016-03-28 | 2016-03-28 | Quick isolating device of MMC direct current trouble |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620246524.3U CN205509845U (en) | 2016-03-28 | 2016-03-28 | Quick isolating device of MMC direct current trouble |
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| CN205509845U true CN205509845U (en) | 2016-08-24 |
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ID=56734342
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| CN201620246524.3U Active CN205509845U (en) | 2016-03-28 | 2016-03-28 | Quick isolating device of MMC direct current trouble |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849635A (en) * | 2017-04-01 | 2017-06-13 | 中国科学院电工研究所 | Cascade connection multi-level transverter submodule pressure bypass circuit out of control |
| CN107070246A (en) * | 2017-04-19 | 2017-08-18 | 南京南瑞继保电气有限公司 | A kind of energy supplying system and method |
| CN110896209A (en) * | 2019-12-09 | 2020-03-20 | 西安交通大学 | Flexible direct-current transmission rapid protection switch system and use method |
| CN113872158A (en) * | 2021-11-09 | 2021-12-31 | 广东电网有限责任公司广州供电局 | IGCT device converter station locking method, system and storage medium |
-
2016
- 2016-03-28 CN CN201620246524.3U patent/CN205509845U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849635A (en) * | 2017-04-01 | 2017-06-13 | 中国科学院电工研究所 | Cascade connection multi-level transverter submodule pressure bypass circuit out of control |
| CN106849635B (en) * | 2017-04-01 | 2019-07-30 | 中国科学院电工研究所 | Cascade connection multi-level inverter submodule pressure bypass circuit out of control |
| CN107070246A (en) * | 2017-04-19 | 2017-08-18 | 南京南瑞继保电气有限公司 | A kind of energy supplying system and method |
| CN110896209A (en) * | 2019-12-09 | 2020-03-20 | 西安交通大学 | Flexible direct-current transmission rapid protection switch system and use method |
| CN113872158A (en) * | 2021-11-09 | 2021-12-31 | 广东电网有限责任公司广州供电局 | IGCT device converter station locking method, system and storage medium |
| CN113872158B (en) * | 2021-11-09 | 2023-08-04 | 广东电网有限责任公司广州供电局 | IGCT device converter station locking method, system and storage medium |
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