CN109742740A - A kind of reciprocal current-limiting type high-voltage direct-current breaker topology of modular type - Google Patents
A kind of reciprocal current-limiting type high-voltage direct-current breaker topology of modular type Download PDFInfo
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- CN109742740A CN109742740A CN201811552131.5A CN201811552131A CN109742740A CN 109742740 A CN109742740 A CN 109742740A CN 201811552131 A CN201811552131 A CN 201811552131A CN 109742740 A CN109742740 A CN 109742740A
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Abstract
The present invention provides a kind of reciprocal current-limiting type high voltage DC breaker of modular type (Clamped Single Module Type Reciprocating High Voltage DC Circuit Breaker With Current-Limiting Capability) topology.The breaker is made of x (x >=3 and be an odd number) branch.It include a current-limiting inductance L in every branchpWith a cutout valve section (Breaking Valve, BV).Include 3 branches in each BV: wherein through-flow branch routes Fast mechanical switch a S and N1A submodule (Submodule, SM) is connected in series；It shifts branch and routes N2A sub- block coupled in series forms；Arrester branch routes several arresters and is connected in series.The breaker topology converts IGBT group equipped with x-1 group in specific position, and conversion IGBT group is connected in series by several IGBT, and each IGBT is furnished with an anti-paralleled diode.The breaker can work in branch circuit parallel connection mode and branch series model.Under normal operating condition, x branch circuit parallel connection of breaker influences the steady-state performance of DC grid smaller；Under nonserviceabling, x branch series connection of breaker has stronger fault current inhibitory effect and breaking capability.
Description
Technical field
The invention belongs to transmission & distribution electro-technical fields, and in particular to a kind of reciprocal current-limiting type high voltage DC breaker of modular type is opened up
Flutter (Clamped Single Module Type Reciprocating High Voltage DC Circuit Breaker
With Current-Limiting Capability)。
Background technique
With with insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) be representative
All-controlling power electronics device large-scale application, the flexible DC transmission technology with good controllability and scalability is rapid
Development.In recent years, correlative study deepens continuously, and the research in relation to flexible DC transmission technology is gradually sent out from previous point-to-point transmission of electricity
Exhibition is flexible direct current power grid.Flexible direct current power grid can integrate various loads to the maximum extent, have complementary advantages, in conjunction with advanced storage
Energy means will become the effective means of extensive new energy consumption.However DC grid has the spy of " low inertia, Low ESR "
Property, after dc-side short-circuit fault occurs, fault current will substantial increase in a very short period of time, seriously affect DC grid system
Safety and stability.
Most reliable Fault Isolation mode first is that using dc circuit breaker (Direct Current in DC grid
Circuit Breaker,DCCB).Protection scheme based on dc circuit breaker can be realized quick faulty line and remove and be
System is restarted.Therefore, dc circuit breaker is of great significance to the stable operation of DC grid.Direct-current breaker topology is numerous, root
According to the type of switching device main in breaker, mechanical dc circuit breaker, pure solid-state direct-current breaker and mixing can be divided into
Formula dc circuit breaker.In the breaker of three types, hybrid dc circuit breaker has both the economy of mechanical dc circuit breaker
The reaction speed of property and pure solid-state direct-current breaker, has broad application prospects in DC grid.
Topology, which is proposed, with ABB AB relies primarily on full-control type power electronic device for the hybrid high voltage DC breaker of representative
The cutting of part completion electric current.But the use of the wholly-controled devices such as current IGBT is limited to individual devices voltage rating, electric current, in height
The occasion for pressing high-capacity direct current power grid, needs big metering device series-parallel, the consistency of switch motion is difficult to be guaranteed, reliability
It is poor.And the higher cost of IGBT, largely it will increase economic cost using IGBT.
Summary of the invention
In view of the above-mentioned problems, the present invention designs a kind of reciprocal current-limiting type high-voltage direct-current breaker topology of modular type.Normal fortune
When row, which, which can work, is influencing lesser branch circuit parallel connection mode to DC grid steady-state performance；After breaking down, this is opened up
Flutterring can work in the higher branch series model of impedance, to inhibit fault current and complete disjunction.
The reciprocal current-limiting type high-voltage direct-current breaker topology of a kind of modular type proposed by the present invention, in order to realize that fault current limits
The function of stream and fault current disjunction, devises relevant workflow and control logic.
Detailed description of the invention
Fig. 1 is 3 branch form topology structures of mentioned breaker.Wherein LpFor branch current-limiting inductance, TH1, TH2 are conversion
IGBT group.S is Fast mechanical switch.SM is the submodule schematic illustration for meeting breaker requirement, if switch K is opened, electricity
Hold investment circuit, the capacitor of submodule is illustrated to put into state；If switch K is closed, capacitor is bypassed, and illustrates the bypass of submodule
State.N1For through-flow branch submodule series connection number, N2For transfer branch submodule series connection number.
Fig. 2 is the simple system topological diagram of breaker workflow analysis.Wherein, u1、u2Respectively both ends inverter direct current
Voltage, L01、L02For both ends converter station smoothing reactor, R01、R02For line equivalent resistance, imFor the total current for flowing through breaker,
By two converter stations with the mentioned dc circuit breaker of the present invention, BV is cutout valve section by DCCB1, DCCB2.
Fig. 3 is t0~t1Moment steady state operation phase system equivalent circuit diagram.
Fig. 4 is t1~t2Moment fault detection stage system equivalent circuit diagram.
Fig. 5 is t2~t3Moment current limliting stage system equivalent circuit diagram.
Fig. 6 is t2+When etching system equivalent circuit computing circuit figure.
Fig. 7 is electric current schematic diagram of transfer process.
Fig. 8 is t3~t4The transfer of moment electric current and disjunction delay stage system equivalent circuit diagram.
Fig. 9 is t4~t5Fault clearance stage at moment, the system equivalent circuit diagram before lightning arrestor movement.
Figure 10 is 5 branch form topology structure charts of breaker.
Specific embodiment
It is topological that breaker is mentioned for the present invention as shown in Figure 1, and submodule, which can be, any meets breaker functional requirement
Submodule, all have locking, the submodule of bypass functionality is all satisfied breaker functional requirement.Wherein, blocking refers to
Only when electric current is capacitor charging, capacitor is accessed in circuit, and a kind of state of the capacitor without normal direction circuit discharging；Bypass condition is
Refer to that capacitor is bypassed by submodule self structure, a kind of state not interacted with circuit.SM schematic construction institute as shown in figure 1
Show, when K is opened, capacitor C is unidirectionally accessed in circuit, indicates that submodule is in blocking；When K closure, capacitor C is other
Road indicates that submodule is in bypass condition.It should be mentioned that Fig. 3 only illustrates the locking of submodule, bypass condition, do not indicate
The particular circuit configurations of submodule, all submodules (such as full-bridge submodule, half-bridge submodule etc.) for meeting breaker requirement
Use in the present invention is within that scope of the present invention.
In breaker proposed by the invention, control mode all phases of whole submodules in all cutout valve section branches of the same name
Together, for simplicity, all submodules in the branch are hereafter referred to " certain branch locking/bypass " is uniformly controlled state.
For example, " locking of transfer branch " indicates in the transfer branch of all cutout valve sections that the state of a control of whole submodules is side
Road.
For the performance and working principle that the present invention is further explained, below with reference to attached drawing, in simple system as shown in Figure 2
The workflow of disjunction is completed after breaker is introduced in system from steady-state operation to failure.
In the breaker course of work, from t0Moment steady-state operation is to t5Moment breaker completes disjunction, the shared t in centre1、t2、
t3、t4Four crucial moments: t1DC Line Fault, t occur for the moment2Moment mechanical switch receives separating brake instruction, t3Moment terminates failure
Current limliting, t4Moment mechanical switch separating brake is completed.
t0~t1Moment, steady state operation phase: when systematic steady state operation, conversion IGBT group TH1, TH2 conducting, through-flow branch
Roadside road, transfer branch locking, steady-state current flow through breaker through through-flow branch.3 branches of breaker are in parallel connection,
The steady-state performance of system is influenced smaller.Its steady-state current access is as shown in Fig. 1 gray dash-dotted line.
t1~t2Moment, fault detection stage: t1Moment failure occur, protective device it is still necessary to want certain time to be detected,
This period, inner breaker was failure to actuate, and fault current will be through through-flow branch Free Development.Fault current path such as Fig. 1 grey click and sweep
Shown in line.This stage system equivalent circuit is as shown in Figure 4.
t2~t3Moment, current limliting stage: after protective device detects failure, in t2Moment issues instruction, and through-flow branch is enabled to close
Lock, submodule access circuit in carry out current limliting, while convert IGBT group TH1, TH2 turn off, three branches of breaker from and be coupled
Structure becomes connecting, into limited current state.Under limited current state, not only current-limiting inductance series connection accesses circuit, all sons in through-flow branch
Module capacitance, which is also connected, accesses circuit, and fault current path is as shown in figure 1 shown in black chain-dotted line.This stage system it is equivalent
Circuit is as shown in Figure 5.
t3~t4Moment, electric current transfer and disjunction delay stage: t3Before moment, if failure has been removed, fault current will no longer
Continue to develop, through-flow branch can be made to bypass with retriggered submodule, directly restores to operate normally；It is on the contrary then break
Road movement.After protective device judgement needs tripping action, transfer branch bypass is enabled, fault current will be transferred to from through-flow branch
Move branch.The electric current for further detecting through-flow branch, when it after cut-offfing permission electric current, provides separating brake less than Fast mechanical switch
Instruction.Electric current transfer process is as shown in Figure 7.After the completion of electric current transfer, mechanical switch receives separating brake instruction.In general, mechanical
The break of switch is 2ms.
t4~t5Moment, the fault clearance stage: after the complete disjunction of mechanical switch, locking transfer branch.Fault current is first to turn
Branch capacitor charging is moved, after capacitance voltage reaches protection of arrester voltage, fault current passes through arrester dissipation energy, failure
Electric current decline.Arrester is non-linear element, and before lightning arrestor movement, the equivalent circuit of system is as shown in Figure 9.
It is illustrated by above-mentioned it is found that a kind of reciprocal current-limiting type of the modular type proposed is high in conjunction with control method appropriate
Pressure dc circuit breaker has the function of fault current limitation and fault current disjunction.
3 branch shapes of the above procedure based on the reciprocal current-limiting type high voltage DC breaker of a kind of modular type proposed by the invention
Formula is analyzed, and when number of branches is more, breaker has similar action process.It is as shown in Figure 10 proposed by the invention
Breaker 5 branch forms.
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 (6)
1. a kind of reciprocal current-limiting type high-voltage direct-current breaker topology of modular type, it is characterised in that: include x branch, x is arbitrarily large
In or equal to 3 odd number.Each branch is by a current-limiting inductance LpIt is constituted with a cutout valve section.In addition to this, break
Be further equipped in the device of road x-1 group conversion IGBT group TH1, TH2 ..., THx-1, allocation position is as shown in Figure of abstract.It needs
Bright, Figure of abstract is illustrated in the form of 3 branches of mentioned breaker topology, and the circuitry number of the practical breaker can be any
Odd number more than or equal to 3.
2. the reciprocal current-limiting type high-voltage direct-current breaker topology of a kind of modular type according to claim 1, it is characterised in that: every
A cutout valve segment structure is identical, includes through-flow branch, transfer 3 branches of branch and arrester branch.Wherein through-flow branch routing one
A Fast mechanical switch S and N1A sub- block coupled in series forms；It shifts branch and routes N2A sub- block coupled in series forms, in general, N2It answers
It is far longer than N1；Arrester branch routes several arresters and is connected in series, and series connection number is related with protection voltage swing.
3. the reciprocal current-limiting type high-voltage direct-current breaker topology of a kind of modular type according to claim 1, it is characterised in that: disconnected
Submodule in the valve section of road can be any submodule for meeting breaker functional requirement, and the effect of capacitor is to participate in submodule
Failure current limit and fault current disjunction, all have locking and the submodule of bypass functionality is all satisfied breaker functional requirement.Its
In, blocking refers to that capacitor accesses in circuit, and the one kind of capacitor without normal direction circuit discharging only when electric current is capacitor charging
State；Bypass condition refers to that capacitor is bypassed by submodule self structure, a kind of state not interacted with circuit.
4. the reciprocal current-limiting type high-voltage direct-current breaker topology of a kind of modular type according to claim 1, it is characterised in that: should
In breaker specific position equipped with conversion IGBT group TH1, TH2 ..., THx-1, total x-1 group.It is equipped with position such as Figure of abstract
It is shown.When circuitry number increases, need to increase with conversion IGBT group.IGBT group is converted by the concatenated IGBT of several forward directions and identical number
The IGBT of mesh differential concatenation is connected in series, and can satisfy two-way through-flow demand, and each IGBT is furnished with an anti-paralleled diode
To prevent from being reversed voltage breakdown.In same conversion IGBT group, the control signal of all IGBT is all the same.
5. the reciprocal current-limiting type high-voltage direct-current breaker topology of a kind of modular type according to claim 1, it is characterised in that: should
Breaker can work in branch circuit parallel connection and branch series connection two states, and can switch mutually between the two states.
When steady-state operation, breaker work is in branch circuit parallel connection state, and converting IGBT group TH1 to THx-1 is on state, so that x item
Branch is in parallel connection, influences on the steady-state performance of DC grid smaller；After breaking down, breaker work is connected in branch
State, all conversion IGBT groups are off state, so that x branch is in series connection, are conducive to failure current limit and failure
The disjunction of electric current.
6. the reciprocal current-limiting type high-voltage direct-current breaker topology of a kind of modular type according to claim 1, it is characterised in that: one
The kind reciprocal current-limiting type high-voltage direct-current breaker topology of modular type, not only serves as high voltage DC breaker and directly applies to direct current
Net field can also be applied to other related fieldss, indirect utilization invention topology by the similar release unit of principle of compositionality
And the other application occasion of thought is in interest field.
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| CN110061483A (en) * | 2019-05-28 | 2019-07-26 | 华北电力大学 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section |
| CN110112716A (en) * | 2019-05-28 | 2019-08-09 | 华北电力大学 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with diode bidirectional bridge |
| CN110739662A (en) * | 2019-05-29 | 2020-01-31 | 华北电力大学 | module type reciprocating current-limiting high-voltage direct-current breaker topology |
| CN111030059A (en) * | 2019-12-06 | 2020-04-17 | 华北电力大学 | Flexible module type reciprocating current-limiting high-voltage direct-current circuit breaker topology |
| CN113809724A (en) * | 2020-06-15 | 2021-12-17 | 许继集团有限公司 | Method and device for protecting main branch electronic switch of hybrid high-voltage direct-current circuit breaker |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110061483A (en) * | 2019-05-28 | 2019-07-26 | 华北电力大学 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with flow-limiting valve section |
| CN110112716A (en) * | 2019-05-28 | 2019-08-09 | 华北电力大学 | The reciprocal current-limiting type high voltage DC breaker of single clamper modular type with diode bidirectional bridge |
| CN110739662A (en) * | 2019-05-29 | 2020-01-31 | 华北电力大学 | module type reciprocating current-limiting high-voltage direct-current breaker topology |
| CN111030059A (en) * | 2019-12-06 | 2020-04-17 | 华北电力大学 | Flexible module type reciprocating current-limiting high-voltage direct-current circuit breaker topology |
| CN113809724A (en) * | 2020-06-15 | 2021-12-17 | 许继集团有限公司 | Method and device for protecting main branch electronic switch of hybrid high-voltage direct-current circuit breaker |
| CN113809724B (en) * | 2020-06-15 | 2023-10-20 | 许继集团有限公司 | Main branch electronic switch protection method and device for hybrid high-voltage direct-current breaker |
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