CN109888743A - A kind of decompression clamping type dc circuit breaker suitable for DC grid - Google Patents
A kind of decompression clamping type dc circuit breaker suitable for DC grid Download PDFInfo
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- CN109888743A CN109888743A CN201910149915.1A CN201910149915A CN109888743A CN 109888743 A CN109888743 A CN 109888743A CN 201910149915 A CN201910149915 A CN 201910149915A CN 109888743 A CN109888743 A CN 109888743A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The present invention relates to a kind of decompression clamping type dc circuit breakers suitable for DC grid, belong to multiterminal element, DC grid technical field;The topology can be divided into four branches, and respectively pincers pressure current limliting branch, charging paths, stable state low-loss branch and afterflow is consumed energy branch, need using to devices such as capacitor, disconnecting switch, resistance and inductance.Net side line voltage distribution is reduced to zero, to eliminate DC Line Fault by accessing recharged capacitance, and the effect of the clamp voltage and limitation increase in current generated using its charging in fault loop by the decompression clamping type dc circuit breaker.
Description
Technical field
The present invention relates to a kind of decompression clamping type dc circuit breakers suitable for DC grid, belong to multiterminal element, direct current
Electrical network field.
Background technique
Flexible DC transmission is power transmission technology of new generation, can be used for the neck such as Power System Interconnection and renewable energy access
Domain.Multiterminal element and DC grid based on flexible DC transmission are one of the important directions of the following power network development and change.Mesh
Preceding is the landmark project of China's direct current transportation in Zhangbei County's engineering built, following DC grid engineering will to more multiterminal, it is bigger
Capacity, higher reliability direction develop.In remote DC transmission engineering, overhead line transmission is main transmission mode,
Overhead line is exposed to the external world, and failure risk is high;In addition, the development speed of DC Line Fault is exceedingly fast, fault current is big and there is no certainly
Right zero crossing, so that the removing of DC Line Fault is more difficult, this proposes very high requirement to DC grid fault clearance strategy.
Current implementation method is divided into following several: generating current zero-crossing point based on superimposed oscillation electric current, and then realizes electric current disjunction, lacks
Point be off delay it is too long, cut-off current is limited;DC line increases inversion-rectification link, and the exchange side after inversion is handed over
Circuit breaker trip electric current is flowed, the disadvantage is that turn-off delay is big, could be turned off until current zero-crossing point, and loss is big, involves great expense;
With a large amount of power electronic devices connect, above lightning arrester connected in parallel, electric current flows through the lower branch of impedance in normal work, rise
To low-loss effect is dropped, electric current is first transferred to power electronics branch when off, then opens disconnecting switch, then electricity consumption
Power electronic device is turned off, and absorbs fault energy with arrester.The disadvantage is that cut-off current is limited, and will first will be electric when turning off
Circulation moves on to power electronics branch, also waits for disconnecting switch and fully opens, increases turn-off delay to a certain extent.Part
Independent of the fault clearance strategy of dc circuit breaker, such as half full mixed topology, due to biggish number of devices and operation damage
Consumption, is difficult to realize preferable economy.The exploitation of dc circuit breaker in the following multiterminal element and DC grid still has very much
Problems demand solves, and research is suitable for high voltage, high current occasion, and has good rapidity, the DC Line Fault of economy clear
Except strategy have become there is an urgent need to.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of decompression clamping types suitable for DC grid
Dc circuit breaker.
It is an object of the invention to overcome low current high voltage DC breaker capacity, rapidity and less economical disadvantage.
The technical scheme adopted by the invention is that: when operating normally, breaker flows through normal operating current, no
The normal operation of influence system;When DC line fault occurs, by the clamp capacitor that charge circuit is pre-charged, limited in clamper
It flows back to by access main circuit in road, the high voltage generated using its charging and metering function make line voltage distribution be reduced zero, route
On disconnecting switch can disjunction faulty line;The energy of the route storage of failure side can be consumed by afterflow energy consumption circuit
Energy.
Compared with prior art, the present invention has the advantage that are as follows:
1, rapidity is high, firstly, this programme after voltage is reduced to zero can disjunction Fast mechanical switch, Quick mechanical opens
Failure after opening is closed just to be removed, it is fully erased without waiting for failure, reduce turn-off delay;Further, since capacitor passes through
Precharge is crossed, so capacitor has had higher voltage when failure occurs, so Fault Isolation can be more quickly completed
Operation, further improves removing speed.
2, at low cost, this programme does not need to carry out a large amount of power electronic devices in series and parallel to realize fault clearance, only
The capacitor of low-capacitance is needed to carry out auxiliary operation, the cost of capacitor can be far smaller than the cost of power electronic devices.
3, economical operation, for this programme in steady-state operation, the power electronic devices quantity accessed in circuit is much
Less than Traditional DC breaker scheme, so generated turn-on consumption and turn-off power loss are smaller, always in steady-state operation
Loss it is also just more low so that the operation of breaker is more economical.
Detailed description of the invention
The following further describes the present invention with reference to the drawings.
Fig. 1 shows a kind of decompression clamping type direct-current breaker topology structural schematic diagram suitable for DC grid, including
Pincers pressure current limliting branch, charging paths, stable state low-loss branch and afterflow energy consumption branch;
Fig. 2 shows charging stage schematic diagrames;
Fig. 3 shows pincers pressure current limliting stage schematic diagram;
Fig. 4 shows afterflow energy consumption stage schematic diagram.
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.
A kind of decompression clamping type direct-current breaker topology structural schematic diagram suitable for DC grid is as shown in Figure 1, include
Pincers pressure current limliting branch, charging paths, stable state low-loss branch and afterflow energy consumption branch;
Fig. 2 shows charging stage schematic diagrames, when charging starts, open disconnecting switch UFD2 for derided capacitors Cc, charging
Resistance Rc and charging inductance Lc accesses charge circuit, and DC line starts to charge to clamp capacitor C at this time, and DC current Idc points
Stream is steady-state current Isteady and charging current Icharge two parts, as shown in Fig. 2 (b).Due to having accessed two poles in circuit
Pipe, after the voltage of clamp capacitor C reaches peak, which will not enter concussion process, and electric current will drop to zero, at this time
It turns off UFD2 and charging paths is isolated, charging process terminates.
Fig. 3 shows pincers pressure current limliting stage schematic diagram, and t0 moment failure occurs, and fault current Ifault is by converter station through low
Loss branch flows to fault point, as shown in Fig. 3 (a).
T1 moment system detection issues instruction locking T1 to failure, and the fault current of low-loss branch road is quickly transferred to
In the branch of T2 and current-limiting resistance R composition, and preliminary current limliting is carried out by current-limiting resistance R, as shown in Fig. 3 (b).When flowing through UFD1's
When electric current is reduced to 0, UFD1 is turned off.Since disconnecting switch shutdown generally has 2-3ms delay, therefore need that UFD1 is waited to complete switch off,
Next step operation can just be carried out.
T2 moment, UFD1 are complete switched off, and are latched T2 at this time clamp capacitor C is accessed fault current circuit, are made it first
It further charges on the basis of beginning voltage, utilizes the DC voltage of its backward voltage clamper converter station generated.In the process,
Electric current in pincers pressure current limliting branch is declined with biggish speed, therefore also needs to open T3 simultaneously to provide afterflow time for fault current
Road.Current on line side Igrid is by pincers pressure branch current Iclamp and afterflow energy consumption electric current Iconsume two parts, such as figure during being somebody's turn to do
Shown in 3 (c).
T3 moment, pincers pressure branch current are down to zero, UFD3 are turned off with isolated fault route, which also needs 2-
The delay of 3ms.
Fig. 4 shows afterflow energy consumption stage schematic diagram, and t4 moment UFD3 is complete switched off, and is latched T3, by energy consumption capacitor Cc, consumption
The energy consumption branch access of energy resistance Rc and energy consumption inductance Lc composition, the process of quickening route energy consumption.
T5 moment, energy consumption are completed, and fault clearance operation is completed.
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 decompression clamping type dc circuit breaker suitable for DC grid, it is characterised in that: including pincers pressure current limliting branch, fill
Electric branch, stable state low-loss branch and afterflow consume energy branch, need using to IGBT switch, capacitor, disconnecting switch, resistance and electricity
The devices such as sense.
2. a kind of decompression clamping type dc circuit breaker suitable for DC grid according to claim 1, it is characterised in that:
The effect of pincers pressure current limliting branch is that capacitor is accessed circuit, to play the role of failure clamper and current limliting;The work of charging paths
With being pre-charged to capacitor;The effect of stable state low-loss branch is to flow through steady-state current in stable state;The road of afterflow energy consumption
Effect be to provide continuous current circuit after Fault Isolation for the residual current on route, consume energy simultaneously.
3. a kind of decompression clamping type dc circuit breaker suitable for DC grid according to claim 1, it is characterised in that:
Charging stage, charge circuit by capacitor and charging resistor, derided capacitors etc. jointly access, line voltage distribution to capacitor charging so that
Capacitance voltage can have certain initial voltage before fault clearance operation.
4. a kind of decompression clamping type dc circuit breaker suitable for DC grid according to claim 1, it is characterised in that:
Electric current is transferred to pincers pressure current limliting circuit, later again by clamp capacitor by pincers pressure current limliting stage, the first IGBT in disconnection major loop
Circuit is accessed, so that the clamp capacitor for having initial voltage limits electric current, while the high voltage after charging can be right
Failure DC voltage carries out clamper.
5. a kind of decompression clamping type dc circuit breaker suitable for DC grid according to claim 1, it is characterised in that:
It consumes energy the stage in afterflow, since clamper terminates, failure is isolated, and the residual current by failure side line road is needed to disappear at this time
Consumption is to remove failure, by providing continuous current circuit for residual current, while utilizing resistance and electricity for afterflow energy consumption circuit access
Hold consumption residual current.
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110350491A (en) * | 2019-06-14 | 2019-10-18 | 华北电力大学 | Decompression clamping type direct-current breaker topology suitable for DC grid |
CN110571814A (en) * | 2019-07-31 | 2019-12-13 | 全球能源互联网研究院有限公司 | energy control circuit and method based on resistance-capacitance device |
CN111030060A (en) * | 2019-12-06 | 2020-04-17 | 华北电力大学 | Clamp-on circuit breaker topology suitable for direct current fault removal |
CN112152599A (en) * | 2020-08-13 | 2020-12-29 | 中车株洲电力机车研究所有限公司 | All-solid-state direct current circuit breaker |
CN112886550A (en) * | 2021-01-12 | 2021-06-01 | 天津大学 | MMC flexible direct-current power grid self-adaptive fault clearing scheme based on source network coordination |
WO2021119938A1 (en) * | 2019-12-16 | 2021-06-24 | 西门子股份公司 | Hybrid circuit breaker, hybrid circuit breaker system, and circuit breaker method |
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CN108258669A (en) * | 2018-02-05 | 2018-07-06 | 全球能源互联网研究院有限公司 | A kind of secondary phase changing type direct current limiter and its control method |
CN108448548A (en) * | 2018-04-26 | 2018-08-24 | 东南大学 | A kind of combined DC breaker and its control method based on recharged capacitance |
CN109286182A (en) * | 2018-11-14 | 2019-01-29 | 华北电力大学 | A kind of DC voltage clamper removed for flexible direct current electric network fault |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN110350491A (en) * | 2019-06-14 | 2019-10-18 | 华北电力大学 | Decompression clamping type direct-current breaker topology suitable for DC grid |
CN110571814A (en) * | 2019-07-31 | 2019-12-13 | 全球能源互联网研究院有限公司 | energy control circuit and method based on resistance-capacitance device |
CN111030060A (en) * | 2019-12-06 | 2020-04-17 | 华北电力大学 | Clamp-on circuit breaker topology suitable for direct current fault removal |
WO2021119938A1 (en) * | 2019-12-16 | 2021-06-24 | 西门子股份公司 | Hybrid circuit breaker, hybrid circuit breaker system, and circuit breaker method |
CN114667657A (en) * | 2019-12-16 | 2022-06-24 | 西门子股份公司 | Hybrid circuit breaker, hybrid circuit breaking system and circuit breaking method |
CN114667657B (en) * | 2019-12-16 | 2024-04-09 | 西门子股份公司 | Hybrid circuit breaker, hybrid circuit breaking system and circuit breaking method |
CN112152599A (en) * | 2020-08-13 | 2020-12-29 | 中车株洲电力机车研究所有限公司 | All-solid-state direct current circuit breaker |
CN112886550A (en) * | 2021-01-12 | 2021-06-01 | 天津大学 | MMC flexible direct-current power grid self-adaptive fault clearing scheme based on source network coordination |
CN112886550B (en) * | 2021-01-12 | 2022-08-12 | 天津大学 | MMC flexible direct-current power grid self-adaptive fault clearing method based on source network coordination |
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