CN109888745A - A kind of fault current fast transfer formula high-voltage direct-current breaker topology - Google Patents
A kind of fault current fast transfer formula high-voltage direct-current breaker topology Download PDFInfo
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- CN109888745A CN109888745A CN201910166775.9A CN201910166775A CN109888745A CN 109888745 A CN109888745 A CN 109888745A CN 201910166775 A CN201910166775 A CN 201910166775A CN 109888745 A CN109888745 A CN 109888745A
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Abstract
The present invention relates to a kind of fault current fast transfer formula high-voltage direct-current breaker topologies, belong to multiterminal element, DC grid technical field；The fault current fast transfer formula high-voltage direct-current breaker topology includes two kinds of modules of cutout valve section and flow-limiting valve section, the flexible switching between three groups of series-parallel connection status of reactor is realized by the state control to each valve section, and transient performance is promoted while not influencing steady-state performance.Voltage balancing circuit and corresponding arrester MOA are arranged to directly concatenated electronic power switch devices (IGBT) all in each valve section simultaneously, in order to avoid partly or wholly overvoltage is generated, protection long term device normal reliable operation.
Description
Technical field
The present invention relates to a kind of fault current fast transfer formula high-voltage direct-current breaker topologies, belong to multiterminal element, direct current
Electrical network field.
Background technique
With in world wide fossil resource it is increasingly depleted, the development of renewable energy is irresistible, flexible direct current electricity
Net is also with fast development.Currently, the tetra- end flexible direct current power grid demonstration project of Zhangbei County ± 500kV built will be in the whole world
Realize that wind-powered electricity generation is powered through DC grid to megalopolis in range for the first time.And compared to conventional AC system, it is set by power electronics
The DC grid of standby composition is " low inertia, Low ESR " system, and responsive time constant is than AC network to when young 2 quantity
Grade.When DC line occur catastrophe failure when, the various energy-storage travelling wave tubes of inverter and DC side all can to fault point feed in energy analysis,
Cause the electric current for flowing through electronic power switch device to rise rapidly, if failure is isolated and is removed not in time, will endanger
The safety of device even entire DC grid and ac grid system.Therefore, faulty line is removed in time, guarantees sound circuit
Power transmission is to guarantee the premise of DC grid reliability service.The scheme for removing DC Line Fault at this stage has very much, according to direct current
The difference of main switch element in breaker, can be divided into: mechanical dc circuit breaker, all solid state dc circuit breaker and hybrid
Dc circuit breaker.Under higher DC voltage level, the above dc circuit breaker only has single DC Line Fault excision function,
The particular demands such as dynamic current limiting are unable to satisfy, need to be used cooperatively with direct current limiter.At the same time, power grid actual motion
Experience have shown that overhead line Many times occur failure be all transient fault, the failure only less than 10% be it is permanent,
Current most of hybrid high voltage DC breakers are provided with reclosing ability, but do not design specific reclosing strategy.Therefore,
The exploitation of dc circuit breaker in the following multiterminal element and DC grid still has many problems demands to solve, and there is an urgent need to study
Suitable for high voltage, high current occasion, there is metering function and have the direct current for the reclosing ability for adapting to various faults situation
Breaker.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of fault current fast transfer formula high voltage direct current
Breaker topology.
It is an object of the invention to overcome current high voltage DC breaker without metering function, cost is excessively high, does not have coincidence
The shortcomings that lock ability.
The technical scheme adopted by the invention is that: when system operates normally, the work of cutout valve section is in low-loss state, limit
Stream valve section is in the conductive state, and low reactance state is presented in three reactor parallel connections of breaker.When DC line breaks down,
Breaker immediately enters limited current state, and cutout valve section enters electric current transfering state, and open-circuit condition, three branches are presented in flow-limiting valve section
Reactance be connected in series, limit the climbing speed of line current.Judgement by system to line fault, it is final to carry out breaking behaviour
Make or restores to operate normally by breaker.
Compared with prior art, the present invention has the advantage that are as follows:
1, have metering function: by the design of topological structure and control strategy, realizing the low reactance of stable state and transient state is high
The flexible switching of current-limiting reactor realizes metering function on the basis of having cut-out function.
2, at low cost: to realize bidirectionally conductive using diode rectifier bridge model, reduce IGBT usage amount, save
Cost enhances engineering feasibility.
3, have reclosing ability and reduce maloperation possibility: under system-level and cost constraint, by configuring branch
Number amount can maximize metering function, so that the climbing of fault current is significantly limited, when increasing fault detection redundancy
Between, the sufficient time is provided for being detected and confirmed for failure.
4, control complexity is low and is swift in motion: flow-limiting valve section only has IGBT switching group device, and supper-fast machinery is not present
Devices such as (UFD) are switched, once IGBT switching group acts, electric current will shift branch immediately.
5, device reliability is high: arranging to directly concatenated electronic power switch devices (IGBT) all in each valve section
Voltage balancing circuit and corresponding arrester MOA protect long term device normal reliable in order to avoid generating partly or wholly overvoltage
Operation.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 shows a kind of structural schematic diagram of fault current fast transfer formula high-voltage direct-current breaker topology, including 1
Cutout valve section, 2 flow-limiting valve sections and 3 groups of reactors；
Fig. 2 shows three kinds of operational mode current paths of fault current fast transfer formula high-voltage direct-current breaker topology
Figure；
Fig. 3 shows the control flow chart in fault treating procedure.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description.
The topological structure of fault current fast transfer formula high voltage DC breaker is as shown in Figure 1, include 1 cutout valve section, 2
A flow-limiting valve section and 3 groups of reactors, wherein its cutout valve section includes three branches: branch 1 is the through-flow branch of low-loss, main
It to be made of UFD, anti-series IGBT switching tube and arrester MOA matched with its；Branch 2 is energy absorption branch, mainly
It is made of multiple groups arrester MOA, for protecting device and consumption line residual energy；Branch 3 is power electronics open circuit branch, main
It to be made of diode rectifier bridge inscribe IGBT structure, so that the unidirectional arrangement of IGBT meets the requirement of two-way open-circuit operation.
Flow-limiting valve section only includes a branch, is made of multiple groups inverse parallel IGBT switching tube and arrester MOA matched with its.Direct current
After line failure, flow-limiting valve section cooperates the reactance group of three branch roads that the electric current for flowing through the valve section originally is transferred to reactance
In group, to reach current limitation effect.All directly concatenated IGBT switching devices all devise voltage balancing circuit in each valve section,
And it is configured with corresponding arrester MOA, it avoids generating partly or wholly overvoltage, protection long term device normal reliable operation.
The novel high-pressure direct-current breaker topology may operate at following 3 kinds of operating modes, be illustrated in figure 2 various Working moulds
Current path figure under formula: 1. normal mode of operation, as shown in Fig. 2 (a).When systems are functioning properly, which runs herein
Under mode.At this point, three reactors of different branch are connected in parallel, low reactance state is presented, reduces to dynamic performance
Influence.2. current-limit mode, as shown in Fig. 2 (b).When disturbance or fault condition occur for system, which immediately will originally simultaneously
Three reactors of connection state put into series connection, and reactance value increases to N*L from L/N, and high reactance state is presented, and limit route
The climbing speed of electric current provides the sufficient reaction time for system detection judgement.3. open circuit mode after failure current limit, such as Fig. 2 (c)
It is shown.When system jam, each branch operates in current-limit mode immediately, limits current rise rate, judges this to system
When failure when being permanent fault, operate cutout valve section and flow-limiting valve section, disengagement failure route, while by concatenated reactor
Again in parallel, low reactance state is presented, realizes Fault Isolation and quickly carries out the dissipation of fault current.
Control flow chart in fault treating procedure is as shown in figure 3, UFD when system operates normally, in cutout valve section
Low-loss on state is in the IGBT being connected in series with it, power electronics open circuit branch is in high-impedance state off state, limit
All IGBT for flowing valve section are in the conductive state, and the breaker topology operates in the 1. state of the mode as shown in Fig. 2 (a) at this time.
When system detection to be suspected to be failure occur when, enter limited current state: opening the institute of power electronics open circuit branch in cutout valve section
There is IGBT, simultaneously turns off all IGBT in the low-loss branch and flow-limiting valve section of cutout valve section, at this time the reactance of three branches
Device is converted into series connection by parallel connection, and big reactance state is presented, and the first moment limited the climbing speed of line current, simultaneously
Line current is gradually transferred to power electronics open circuit branch from the low-loss branch of cutout valve section.Ultra fast breaker UFD to be passed through
Electric current when being down to zero, open UFD, line current flows completely through power electronics open circuit branch.
In whole process, system is constantly carrying out being detected and confirmed for fault type.If confirming the failure occurred at this time
For the erroneous judgement (microvariations etc. occur for system) of temporary fault or failure: firstly, line current and voltage is waited to restore normal water
It is flat；Then, UFD is opened, allows its contact to reach and come into full contact with, and any electric arc will not be generated at this time；Finally, giving cutout valve section
Low-loss branch and all IGBT of flow-limiting valve section issue Continuity signal, while in cutout valve section power electronics open circuit branch
IGBT issues cut-off signals, and three reactor recoveries are connected in parallel, and system restores normal operating condition.If system confirmation at this time
Fault type is permanent fault: immediately turning off the IGBT of power electronics open circuit branch, disengagement failure electric current at the same time will
All IGBT of flow-limiting valve section are connected, and put into operation again, reactor is connected in parallel again, and purpose is exactly in order to which low electricity is presented
Anti- value accelerates the dissipation rate of fault current.With rising rapidly for voltage, the voltage at the both ends cutout valve section MOA is more than quickly
Its protection value, remaining fault current just pass through the MOA and carry out fast dissipation to zero, to realize the isolation of faulty line.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (5)
1. a kind of fault current fast transfer formula high-voltage direct-current breaker topology, it is characterised in that: including 1 cutout valve section, 2
Flow-limiting valve section and 3 groups of reactors；Wherein cutout valve section includes wholly-controled device (IGBT), diode, supper-fast mechanical switch
(UFD), metal oxide arrester (MOA), conducting wire etc.；Flow-limiting valve section includes diode, IGBT, metal oxide arrester
Deng.
2. a kind of fault current fast transfer formula high-voltage direct-current breaker topology according to claim 1, it is characterised in that:
Its cutout valve section include three branches: branch 1 be the through-flow branch of low-loss, mainly by UFD, anti-series IGBT switching tube and with
Its matched arrester MOA composition；Branch 2 is energy absorption branch, is mainly made of multiple groups arrester MOA, and protector is used for
Part and consumption line residual energy；Branch 3 is power electronics open circuit branch, mainly by diode rectifier bridge inscribe IGBT structure group
At so that the unidirectional arrangement of IGBT meets the requirement of two-way open-circuit operation.
3. a kind of fault current fast transfer formula high-voltage direct-current breaker topology according to claim 1, it is characterised in that:
Flow-limiting valve section only includes a branch, is made of multiple groups inverse parallel IGBT switching tube and arrester MOA matched with its.Direct current
After line failure, flow-limiting valve section cooperates the reactance group of three branch roads that the electric current for flowing through the valve section originally is transferred to reactance
In group, to reach current limitation effect.
4. a kind of fault current fast transfer formula high-voltage direct-current breaker topology according to claim 1, it is characterised in that:
The high-voltage direct-current breaker topology may operate at these three works of open circuit mode after normal mode of operation, current-limit mode, faulty line
Operation mode.When system jam, each branch operates in current-limit mode immediately, limits current rise rate, judges to system
When failure at this time is permanent fault, cutout valve section and flow-limiting valve section are operated, disengagement failure route, while by concatenated reactance
Think highly of new parallel connection, low reactance state is presented, realize Fault Isolation and quickly carries out the dissipation of fault current.
5. a kind of fault current fast transfer formula high-voltage direct-current breaker topology according to claim 1, it is characterised in that:
Due to the presence of limited current state, so that the climbing speed of fault current is being inhibited at the first time, to be the inspection of failure
It surveys and confirmation provides the sufficient time.If failure is permanent fault, open-circuit operation is carried out；If failure is temporary event
Barrier then first carries out current-limiting operation, carries out reclosing operation after waiting failure vanishes；If failure is that (system is disturbed for failure erroneous judgement
Move), it first passes through metering function and as early as possible restores line current and voltage to normal level, then by breaker reclosing.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720552A (en) * | 2016-01-25 | 2016-06-29 | 华北电力大学 | Current-limiting high-voltage direct current breaker |
| US20180138689A1 (en) * | 2016-11-11 | 2018-05-17 | Xi'an Jiaotong University | Dc circuit breaker combining magnetic induction transfer and resistance current limiting |
| CN109193580A (en) * | 2018-09-12 | 2019-01-11 | 山东大学 | A kind of current-limiting type high-speed reclosure direct-current breaker topology structure and control method |
| CN109193625A (en) * | 2018-09-11 | 2019-01-11 | 华南理工大学 | A kind of novel combination type direct-current breaker topology |
-
2019
- 2019-03-06 CN CN201910166775.9A patent/CN109888745A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105720552A (en) * | 2016-01-25 | 2016-06-29 | 华北电力大学 | Current-limiting high-voltage direct current breaker |
| US20180138689A1 (en) * | 2016-11-11 | 2018-05-17 | Xi'an Jiaotong University | Dc circuit breaker combining magnetic induction transfer and resistance current limiting |
| CN109193625A (en) * | 2018-09-11 | 2019-01-11 | 华南理工大学 | A kind of novel combination type direct-current breaker topology |
| CN109193580A (en) * | 2018-09-12 | 2019-01-11 | 山东大学 | A kind of current-limiting type high-speed reclosure direct-current breaker topology structure and control method |
Non-Patent Citations (2)
| Title |
|---|
| 李帅等: "一种新型限流式高压直流断路器拓扑", 《电工技术学报》 * |
| 李承昱等: "适用于直流电网的限流混合式直流断路器", 《中国电机工程学报》 * |
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Application publication date: 20190614 |