CN109066608A - A kind of hybrid high voltage DC breaker overcurrent protection method and device - Google Patents
A kind of hybrid high voltage DC breaker overcurrent protection method and device Download PDFInfo
- Publication number
- CN109066608A CN109066608A CN201810820987.XA CN201810820987A CN109066608A CN 109066608 A CN109066608 A CN 109066608A CN 201810820987 A CN201810820987 A CN 201810820987A CN 109066608 A CN109066608 A CN 109066608A
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- breaker
- high voltage
- changing rate
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention relates to a kind of hybrid high voltage DC breaker overcurrent protection method and devices; the guard method includes: the current changing rate for detecting the hybrid high voltage DC breaker side of DC line, and the current changing rate that will test is compared with protection definite value；If current changing rate is greater than protection definite value, controls and disconnect hybrid high voltage DC breaker, to carry out overcurrent protection to DC line and power electronic equipment.The present invention prejudges failure occurrence tendency according to the current changing rate di/dt detected, before fault current development to a certain extent, carries out breaker open operation operation, is not influenced by transmission line of electricity distance, transmission system parameter etc., has high reliability and sensitivity.
Description
Technical field
The present invention relates to a kind of hybrid high voltage DC breaker overcurrent protection method and devices, and it is short to belong to direct current transportation
Road protection technique field.
Background technique
High-voltage direct current or power transmission network have become one of the hot spot of current power domain development, also will be the following power grids
Important component.The power electronic devices such as used SCR, IGBT, diode in high-voltage direct current or power transmission network,
Its current stress be less than failure when system failure electric current development speed, therefore power electronic devices type selecting need to consider it is enough abundant
Degree, and the break of strict control fault current.It is required that high voltage DC breaker can within the shortest time disjunction failure
Electric current protects power electronic devices to reduce the impact to system.
In DC transmission system, the short-circuit protection technology of currently known use is broadly divided into following three kinds:
1) it cut-offs the change of current and becomes exchange side breaker
When line failure, faulty line is cut off from system by cut-offfing converter power transformer enter line side breaker,
Reliable breaking is higher；Break is longer, may cause the damage of converter valve power electronic devices or needs to increase power electronics
The safety margin of device；The complete power loss of DC fields, the route not broken down also can therefore out of service, system job stability
It is poor, it is unfavorable for the development of multi-terminal direct current transmission system.
2) converter valve is closed
When line failure, realize that short-circuit protection, short-circuit protection are swift in motion by closing converter valve, but to electric power
Electronic device impact is larger, is not suitable for the flexible direct current converter valve containing anti-paralleled diode, is not suitable for flexible DC transmission
Network.
3) high voltage DC breaker on polar curve with quick breaking function is cut-off
High voltage DC breaker is broadly divided into mechanical dc circuit breaker, full fixed DC breaker and hybrid straight
Three kinds of breaker of stream.Wherein, mechanical high-voltage dc circuit breaker needs artificially generated zero crossing, the mute time phase of fault current
To longer, cannot achieve flexibly, action message；All solid state formula dc circuit breaker breaking course does not generate electric arc, can be reliable, fast
Quick-action is made, but is confined to the voltage endurance capability of current electrons device, and high-power system needs series-parallel a large amount of power electronics
There is pressure, stream in device, the on-state loss of power electronic devices is also larger, there are problems that cooling heat dissipation, cost
Valuableness, operation expense are higher；Hybrid high voltage DC breaker has the good static characteristic of mechanical dc circuit breaker concurrently
With the good dynamic property of solid state dc circuit breaker, have many advantages, such as that switch off time is short, on-state loss is small, it also requires solving
Pressure, flow the problems such as, compared to solid state dc circuit breaker, reliability decreases, but price, occupied area, to consistent
The requirement of property decreases, and is the mainstream development direction of current high-voltage great-current DC transmission system.
Direct current system has the characteristics that line inductance is high, shutdown energy is big, direct-current arc is without zero crossing and in negative resistance charactertistic,
It is required that the breaker being mounted on polar conductor has high drop-out current, Millisecond breaking capacity, hybrid high voltage DC breaker
It is the optimal selection of current disjunction high-voltage great-current DC power transmission line.
Hybrid high voltage DC breaker generallys use the current protection technology based on detection size of current, works as transmission line of electricity
When longer, if short trouble occurs for protection end, short circuit current is smaller, influences the sensitivity of protection；When line construction is complicated, line
When road stray parameter is larger, need to increase the protection definite value of breaker to evade the influence of line parameter circuit value, reliability decrease.
Summary of the invention
The object of the present invention is to provide a kind of hybrid high voltage DC breaker overcurrent protection method and devices, for solving
Certainly existing overcurrent protection is influenced the problem of causing protection sensitivity, reliability to reduce by line current size, line parameter circuit value.
In order to solve the above technical problems, the present invention provides a kind of hybrid high voltage DC breaker overcurrent protection sides
Method, steps are as follows:
Detect the current changing rate of the hybrid high voltage DC breaker side of DC line, and the curent change that will test
Rate is compared with protection definite value；
If current changing rate is greater than protection definite value, controls and disconnect hybrid high voltage DC breaker, to DC line
And power electronic equipment carries out overcurrent protection.
The beneficial effects of the present invention are: failure occurrence tendency is prejudged according to the current changing rate di/dt detected, in event
Before hindering electric current development to a certain extent, breaker open operation operation is carried out, not by the shadow of transmission line of electricity distance, transmission system parameter etc.
It rings, there is high reliability and sensitivity.
Further, the influence that interference source detects current changing rate di/dt in order to prevent passes through the soft filter of certain time-delay
Wave mode carries out breaker control, further includes: if current changing rate is greater than protection definite value, electricity is judged in setting time interval
Rheology rate controls if current changing rate is consistently greater than protection definite value in entire setting time interval and disconnects hybrid height
Press dc circuit breaker.
The present invention also provides a kind of hybrid high voltage DC breaker overcurrent protections, including processor and storage
Device, the processor are used to handle the instruction of storage in the memory to realize following method:
Detect the current changing rate of the hybrid high voltage DC breaker side of DC line, and the curent change that will test
Rate is compared with protection definite value；
If current changing rate is greater than protection definite value, controls and disconnect hybrid high voltage DC breaker, to DC line
And power electronic equipment carries out overcurrent protection.
Further, further includes: if current changing rate is greater than protection definite value, judge that electric current becomes in setting time interval
Rate controls if current changing rate is consistently greater than protection definite value in entire setting time interval and disconnects hybrid high straightening
Flow breaker.
Detailed description of the invention
Fig. 1 is the flow chart of hybrid high voltage DC breaker overcurrent protection method；
Fig. 2 is the structural schematic diagram of hybrid high voltage DC breaker over-current protection system.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
The present invention will be described in further detail for example.
The present invention provides a kind of hybrid high voltage DC breaker overcurrent protections, including processor and storage
Device, the processor is for handling the instruction being stored in the memory, to realize that a kind of hybrid high voltage DC breaker is excessively electric
Flow guard method, flow chart as shown in Figure 1, specifically includes the following steps:
(1) current changing rate of the hybrid high voltage DC breaker side of DC line, and the electric current that will test are detected
Change rate is compared with protection definite value.
(2) it if current changing rate is greater than protection definite value, controls and disconnects hybrid high voltage DC breaker, to rear side
DC line carries out overcurrent protection.
The influence that interference source detects current changing rate di/dt in order to prevent, by using the soft filtering side of certain time-delay
Formula, to guarantee the reliability of protection.That is: if current changing rate di/dt is greater than protection definite value, judge in setting time interval
It is hybrid to control disconnection if current changing rate is consistently greater than protection definite value in entire setting time interval for current changing rate
High voltage DC breaker.It is, di/dt increases, when di/dt reaches when short trouble occurs for high voltage direct current electric line
It to when protecting setting value, (is delayed the separating brake stage) into disjunction delay stage, if in disjunction delay stage (delay separating brake stage)
It is interior, if di/dt value is consistently higher than protection definite value, it is determined as failure, starts to execute sub-switching operation；If di/dt is fallen back to
Protection definite value is hereinafter, determine that failure does not occur, protection returns.
Above-mentioned hybrid high voltage DC breaker overcurrent protection method and device pass through monitoring di/dt and prejudge failure
(development trend of fault current), fault current development to a certain extent before, carry out sub-switching operation, not by transmission line of electricity away from
Influence from, transmission system parameter etc. has high reliability and sensitivity.
In order to realize above-mentioned hybrid high voltage DC breaker overcurrent protection method and device, the present invention also provides
A kind of hybrid high voltage DC breaker over-current protection system, as shown in Fig. 2, the hybrid high voltage DC breaker overcurrent
Protection system includes breaker control protection device 1, di/dt detection device 2, mechanical switch control protection device 3, main branch solid-state switch control
Protection device 4 and transfer branch solid-state switch control protection device 5, wherein the function of each component parts is as follows:
Breaker control protection device 1: monitoring the operating status of hybrid high voltage DC breaker, including reads, stores other
The signal of component detection, is analyzed and processed signal, sends control signal to other component.
Di/dt detection device 2: the current changing rate of the hybrid high voltage DC breaker side of DC line is detected, and real
When to breaker control protection device 1 send current changing rate numerical signal.
Mechanical switch control protection device 3: monitoring the operating parameter of mechanical switch, and directly controls the disjunction of mechanical switch.
Main branch solid-state switch control protection device 4: hybrid high voltage DC breaker main branch power electronic devices is monitored
Operating parameter simultaneously controls the locking of main branch power electronic devices driving signal, unlock.
Transfer branch solid-state switch control protection device 5: hybrid high voltage DC breaker transfer branch power electronics device is monitored
The operating parameter of part simultaneously controls the locking of transfer branch power electronic devices driving signal, unlock.
Specifically, in order to realize communication process, breaker control protection device 1 by optical cable respectively with di/dt detection device 2,
Mechanical switch control protection device 3, main branch solid-state switch control protection device 4 and transfer branch solid-state switch control protection device 5 are attached.
In conjunction with above-mentioned hybrid high voltage DC breaker over-current protection system, hybrid high voltage DC breaker overcurrent protection side
The workflow of method is as follows:
1) when short circuit occurs, electric current increases suddenly, and current transformation rate is sent to breaker by optical cable by di/dt detection device 2
Control protection device 1.
2) current changing rate is compared by breaker control protection device 1 with protection definite value, after reaching protection definite value, and whole
It is all larger than protection definite value in a delay segmentation stage, then is protected to the transfer branch solid-state switch control of hybrid high voltage DC breaker
Device 5 sends order of closing a floodgate；Each power electronic devices triggering of the transfer control transfer branch of branch solid-state switch control protection device 5 is led
It is logical, and transfer membership signal is back to breaker control protection device 1.
3) it is disconnected to hybrid high voltage direct current after breaker control protection device 1 detects that transfer branch solid-state switch conducting is normal
The main branch solid-state switch control protection device 4 of road device sends separating brake order；It is solid that main branch solid-state switch control protection device 4 controls main branch
State switchs each power electronic devices unlock shutdown, and main branch solid-state switch status signal is back to breaker control protection device 1.
4) it after breaker control protection device 1 detects that the shutdown of main branch solid-state switch is normal, is sent out to mechanical switch control protection device 3
Send separating brake order；Mechanical switch control protection device 3 controls mechanical switch separating brake, and mechanical switch status signal is back to breaker
Control protection device 1.
5) after breaker control protection device 1 detects that mechanical switch separating brake is normal, to transfer branch solid-state switch control protection device 5
Send separating brake order；Shift each power electronic devices unlock of the control transfer branch solid-state switch of branch solid-state switch control protection device 5
Shutdown, and transfer branch solid-state switch status signal is back to breaker control protection device 1.
6) after the completion of working more than, the energy-storage travelling wave tube shifted in branch solid-state switch starts to charge boosting, when reaching energy
After the operation voltage of dissipative element, the energy dissipation element of hybrid high voltage DC breaker starts to act, point of absorption system
Disconnected energy, to realize overcurrent breaking course of the hybrid high voltage DC breaker based on di/dt.
It should be noted that the protection scope of hybrid high voltage DC breaker over-current protection system of the invention be with
The subsequent entirety of electric line, i.e., electric line, equipment after measuring device etc.；Position that it is installed in transmission line of electricity side,
Usually on converter station outlet polar conductor；It is mainly used for HVDC transmission line, distribution line etc., event occurs in above-mentioned position
When barrier, the generation of failure is prejudged by di/dt change rate, disengagement failure electric current protects converter valve, hybrid height in direct current station
Press the power electronic equipments and relevant direct current transmission and distribution route etc. such as dc circuit breaker.By the hybrid high voltage DC breaker mistake
The overcurrent protection method and device that current protection system is realized can be individually for direct current transmission and distribution route and provide protection, also may be used
As main protection or back-up protection, with other overcurrent protection methods (based on size of current, based on current increment-Sudden Changing Rate etc.
Overcurrent protection method) be used cooperatively, provide protection for electric line, further increase the reliability of protection.For example, right
In HVDC transmission line, longitudinal differential protection device can be increased at route both ends, and in the high voltage DC breaker of route
Side increases over-current protection system of the invention, and the protection definite value of the latter is slightly above the former, as the former back-up protection.
Hybrid high voltage DC breaker overcurrent protection method of the invention, apparatus and system, by system power
Change rate is monitored, analyzes, and directly controls breaker solid-state switch part and act in advance, shortens point of system failure electric current
The disconnected time improves reliability, the sensitivity of protection of circuit breaker failure protection, facilitates multiterminal, extra long distance flexible direct current
The development of transmission system has very big market prospects.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Finally it should be noted that: the above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand: those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, are applying within pending claims.
Claims (4)
1. a kind of hybrid high voltage DC breaker overcurrent protection method, which is characterized in that steps are as follows:
Detect DC line hybrid high voltage DC breaker side current changing rate, and the current changing rate that will test with
Protection definite value is compared；
If current changing rate is greater than protection definite value, controls and disconnect hybrid high voltage DC breaker, to DC line and electricity
Power electronic equipment carries out overcurrent protection.
2. hybrid high voltage DC breaker overcurrent protection method according to claim 1, which is characterized in that also wrap
It includes: if current changing rate is greater than protection definite value, current changing rate is judged in setting time interval, if in entire setting time
Current changing rate, which is consistently greater than, in being spaced protects definite value, then controls and disconnect hybrid high voltage DC breaker.
3. a kind of hybrid high voltage DC breaker overcurrent protection, which is characterized in that including processor and memory, institute
Processor is stated for handling the instruction of storage in the memory to realize following method:
Detect DC line hybrid high voltage DC breaker side current changing rate, and the current changing rate that will test with
Protection definite value is compared；
If current changing rate is greater than protection definite value, controls and disconnect hybrid high voltage DC breaker, to DC line and electricity
Power electronic equipment carries out overcurrent protection.
4. hybrid high voltage DC breaker overcurrent protection according to claim 3, which is characterized in that also wrap
It includes: if current changing rate is greater than protection definite value, current changing rate is judged in setting time interval, if in entire setting time
Current changing rate, which is consistently greater than, in being spaced protects definite value, then controls and disconnect hybrid high voltage DC breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810820987.XA CN109066608A (en) | 2018-07-24 | 2018-07-24 | A kind of hybrid high voltage DC breaker overcurrent protection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810820987.XA CN109066608A (en) | 2018-07-24 | 2018-07-24 | A kind of hybrid high voltage DC breaker overcurrent protection method and device |
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| CN109066608A true CN109066608A (en) | 2018-12-21 |
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| CN201810820987.XA Pending CN109066608A (en) | 2018-07-24 | 2018-07-24 | A kind of hybrid high voltage DC breaker overcurrent protection method and device |
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Cited By (6)
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|---|---|---|---|---|
| CN110571770A (en) * | 2019-09-20 | 2019-12-13 | 许继集团有限公司 | Overcurrent protection method and device for direct current circuit breaker |
| CN110661242A (en) * | 2019-01-24 | 2020-01-07 | 台达电子企业管理（上海）有限公司 | Direct current power transmission device, surge control circuit and method |
| CN113183762A (en) * | 2021-05-21 | 2021-07-30 | 中车大连电力牵引研发中心有限公司 | High-voltage electric device of non-contact net rail vehicle |
| CN114336509A (en) * | 2020-09-27 | 2022-04-12 | 中车株洲电力机车研究所有限公司 | Solid-state direct current breaker control system and direct current system |
| TWI784321B (en) * | 2020-03-19 | 2022-11-21 | 奇景光電股份有限公司 | Method for performing hybrid over-current protection detection in a display module, and associated timing controller |
| WO2024073929A1 (en) * | 2022-10-05 | 2024-04-11 | Hong Kong Applied Science and Technology Research Institute Company Limited | Method of identifying a short-circuit like event in a circuit breaker |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110661242A (en) * | 2019-01-24 | 2020-01-07 | 台达电子企业管理（上海）有限公司 | Direct current power transmission device, surge control circuit and method |
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| TWI784321B (en) * | 2020-03-19 | 2022-11-21 | 奇景光電股份有限公司 | Method for performing hybrid over-current protection detection in a display module, and associated timing controller |
| CN114336509A (en) * | 2020-09-27 | 2022-04-12 | 中车株洲电力机车研究所有限公司 | Solid-state direct current breaker control system and direct current system |
| CN113183762A (en) * | 2021-05-21 | 2021-07-30 | 中车大连电力牵引研发中心有限公司 | High-voltage electric device of non-contact net rail vehicle |
| WO2024073929A1 (en) * | 2022-10-05 | 2024-04-11 | Hong Kong Applied Science and Technology Research Institute Company Limited | Method of identifying a short-circuit like event in a circuit breaker |
| US12055601B2 (en) | 2022-10-05 | 2024-08-06 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Method of identifying a short-circuit like event in a circuit breaker |
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