CN105449650B - A kind of protection system and method for flexible direct current intelligence transmission and distribution network - Google Patents
A kind of protection system and method for flexible direct current intelligence transmission and distribution network Download PDFInfo
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- CN105449650B CN105449650B CN201610048170.6A CN201610048170A CN105449650B CN 105449650 B CN105449650 B CN 105449650B CN 201610048170 A CN201610048170 A CN 201610048170A CN 105449650 B CN105449650 B CN 105449650B
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- 230000001012 protector Effects 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims description 8
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Classifications
-
- 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
Abstract
The embodiment of the invention discloses a kind of protection system and method for flexible direct current intelligence transmission and distribution network, to three locality protections of flexible direct current intelligence transmission and distribution network point, including：Alternating-current switch field areas, transverter region and DC power transmission line region, wherein：In alternating-current switch field areas setting alternating-current switch field protective device；In transverter region, converter unit protection device is set；In DC power transmission line region, protection of direct current supply line device is set.It is overlapped protection by the subregion to circuit; the nothing " blind area " that flexible direct current intelligence transmission and distribution network system protection is arranged may be implemented; so that failure or abnormal running equipment in excision system rapidly under failure or other abnormal conditions; the normal work for preventing from damaging system or infecting other parts, to protect the safety and stability of all devices in flexible direct current electrical power trans mission/distribution system to carry out.
Description
Technical field
The present invention relates to electrical power distribution system protection technique fields, more particularly to a kind of flexible direct current intelligence transmission and distribution network
Protection system and method.
Background technology
Flexible direct current intelligence transmission and distribution network technology is a kind of novel direct current transmission and distribution technology, i.e., is answered in direct current transmission and distribution net
With middle transverter using IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) valves and
Two level (or more level) three-phase mechanism, and situation is cut-off using pulse modulation technology control IGBT valves, so that by it
The direct current transmission and distribution net system of composition overcomes the multi-class problem presented in conventional direct current transmission and distribution in many aspects.
Plurality of advantages is presented in the application for flexible direct current intelligence transmission and distribution network technology, as system is stablized by force；It can
Realize the interconnection of asynchronous system；When powering to passive region, commutation failure problem is not present；Convey active power and reactive power
It can quick independent control；It can preferably built by separate periods, favorable expandability；Fast recovery of power supply and black starting-up etc. after accident.
However, a kind of new technology of the flexible direct current intelligence transmission and distribution network system as direct current transportation, for the guarantor of its circuit
Shield measure is still left to be desired.
Invention content
A kind of protection system and method for flexible direct current intelligence transmission and distribution network are provided in the embodiment of the present invention, it is existing to solve
There is the problem of flexible direct current intelligence transmission and distribution network system lacks protection in technology.
In order to solve the above-mentioned technical problem, the embodiment of the invention discloses following technical solutions：
A kind of protection system of flexible direct current intelligence transmission and distribution network is applied to flexible direct current intelligence transmission and distribution network, feature
Be, flexible direct current intelligence transmission and distribution network include the ac bus being sequentially connected electrically, alternating-current switch, be coupled transformer, reactor,
Current conversion station and DC power transmission line and one end ground connection, the other end are electrically connected to the exchange being coupled between transformer and reactor
Filter；Protection system includes alternating-current switch field protective device, converter unit protection device and the DC transmission line being sequentially connected electrically
Line protection device, wherein：Alternating-current switch field protective device include be coupled tranformer protection component, AC filter protection component and
Change of current bus equipment protects component；It includes being coupled transformer differential protection device, being coupled transformer mistake to be coupled tranformer protection component
Stream and overloading protector are coupled transformer overexcitation protection device, are coupled transformer zero-sequence current protection device and are coupled transformer
Non-ionizing energy loss device；It is coupled transformer differential protection device and is coupled transformers connected in parallel connection, is coupled transformer overcurrent and overload
Protector be coupled transformer series connection and be set to be coupled transformer high-pressure side, be coupled transformer zero-sequence current protection
Device is set on the circuit of the ground connection one end for being coupled transformer, is coupled transformer overexcitation protection device and is coupled transformer non-electricity
Protector is coupled transformers connected in parallel connection with described；AC filter protection component is connected in series with alternating current filter, the change of current
Bus equipment protection component is connected in parallel with reactor；Converter unit protection device is connected in series with transverter, DC power transmission line
Protective device is set to DC transmission line road.
Preferably, change of current bus protection component includes change of current bus differential protecting device and change of current bus over voltage protection device.
Preferably, converter unit protection device includes transverter overcurrent protective device, the fast-speed direct current being set in current conversion station
Overvoltage protection device, exchange side overvoltage protection device touch valve pulse monitor, IGBT autoprotections device and ancillary equipment protection
Device.
Preferably, protection of direct current supply line device includes the differential under-voltage protection for being set in turn in DC transmission line road
Device, DC over-voltage protection device and DC voltage unbalance protection device.
Three regions of flexible direct current intelligence transmission and distribution network point are protected in a kind of guard method of flexible direct current intelligence transmission and distribution network
Shield, including：Alternating-current switch field areas, transverter region and DC power transmission line region, wherein：It is arranged in alternating-current switch field areas
Alternating-current switch field protective device passes through connection tranformer protection component, the AC filter protection of alternating-current switch field protective device
Component and change of current bus equipment protection component are protected be coupled transformer, alternating current filter and change of current bus equipment respectively；Pass through institute
It states and is coupled tranformer protection component protection connection transformer, wherein pass through and be coupled transformer differential protection device, be coupled transformer mistake
Stream and overloading protector are coupled transformer overexcitation protection device, are coupled transformer zero-sequence current protection device and are coupled transformation
Device non-ionizing energy loss device carries out differential protection, overcurrent and overload protection, overexcitation protection, zero-sequence current guarantor to being coupled transformer
Shield and non-ionizing energy loss；Transverter region be arranged converter unit protection device, by converter unit protection unit protection transverter with
And transverter and the connection line that is coupled transformer；Protection of direct current supply line device is set in DC power transmission line region, is led to
Cross protection of direct current supply line unit protection DC power transmission line.
Preferably, component protection change of current bus equipment is protected by change of current bus equipment, including：Pass through change of current bus differential
Protector and change of current bus over voltage protection device carry out differential protection and overvoltage protection to change of current bus equipment.
Preferably, by converter unit protection unit protection transverter and transverter and the connection line that is coupled transformer,
Including：By transverter overcurrent protective device, fast-speed direct current overvoltage protection device, exchange side overvoltage protection device, touch valve pulse
Monitor, IGBT autoprotections device and ancillary equipment protector are to transverter and transverter and the connection line that is coupled transformer
It carries out overcurrent protection, fast-speed direct current overvoltage protection, exchange side overvoltage protection, touch valve pulse monitoring, IGBT autoprotections
It is protected with ancillary equipment.
Preferably, by protection of direct current supply line unit protection DC power transmission line, including：Pass through differential under-voltage protection
Device, DC over-voltage protection device and DC voltage unbalance protection device carry out differential under-voltage protection, direct current mistake to DC power transmission line
Pressure protection and DC voltage unbalance protection.
By above technical scheme as it can be seen that the protection system of flexible direct current intelligence transmission and distribution network provided in an embodiment of the present invention and
Method is overlapped protection by the subregion to circuit, may be implemented that flexible direct current intelligence transmission and distribution network system protection is arranged
Nothing " blind area " so that failure or abnormal running equipment in excision system rapidly under failure or other abnormal conditions,
The normal work for preventing from damaging system or infecting other parts owns to protect in flexible direct current electrical power trans mission/distribution system
The safety and stability of equipment carries out.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is a kind of protection system schematic of flexible direct current intelligence transmission and distribution network provided in an embodiment of the present invention；
It illustrates：
1- alternating-current switch field protective device, 2- converter unit protection devices, 3- protection of direct current supply line devices, 11- are coupled
Tranformer protection component, 12- AC filter protection components, 13- change of current bus equipments protect component, and it is poor that 111- is coupled transformer
Dynamic protector, 112- are coupled transformer overcurrent and overloading protector, and 113- is coupled transformer zero-sequence current protection device.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work, should all belong to protection of the present invention
Range.
It is a kind of protection system schematic of flexible direct current intelligence transmission and distribution network provided in an embodiment of the present invention referring to Fig. 1.
Flexible direct current intelligence transmission and distribution network includes the ac bus being sequentially connected electrically, alternating-current switch, is coupled transformer, reactance
Device, current conversion station and DC power transmission line, further include alternating current filter, and alternating current filter one end ground connection, the other end are electrically connected to connection
It ties on the conducting wire between transformer and reactor.
Flexible direct current intelligence transmission and distribution network is divided into three regions, that is, includes ac bus, alternating-current switch, be coupled transformation
The alternating-current switch field areas of device, reactor and alternating current filter, including the transverter region of current conversion station and including direct current transportation
The DC power transmission line region of circuit.
As shown in Figure 1, the protection system of flexible direct current intelligence transmission and distribution network provided in an embodiment of the present invention is to flexible direct current
Point three locality protections of intelligent transmission and distribution network system, be included in the setting of alternating-current switch field areas alternating-current switch field protective device 1,
The converter unit protection device 2 of setting and the protection of direct current supply line dress in the setting of DC power transmission line region in transverter region
Set 3, wherein alternating-current switch field protective device 1 is by being coupled tranformer protection component 11, AC filter protection component 12 and changing
It flows bus equipment and protects component 13, realize the protection to being coupled transformer, alternating current filter and change of current bus equipment.
It is coupled tranformer protection component 11 by being coupled transformer differential protection device 111, being coupled transformer overcurrent and excessively negative
Lotus protector 112, connection transformer overexcitation protection device, connection transformer zero-sequence current protection device 113 and connection transformer are non-
Electric quantity protective device is realized carries out differential protection, overcurrent and overload protection, overexcitation protection, zero-sequence current guarantor to being coupled transformer
Shield and non-ionizing energy loss.
It is coupled transformer differential protection device 111 and is coupled transformers connected in parallel connection, such as voltmeter, connection can be detected and become
Failure current transformer of the depressor on from the current transformer on the casing of high-pressure side to low-pressure side casing, by detecting base
Wave current differential can determine whether to be coupled inside transformer earth fault or winding turn-to-turn short circuit, to take the locking change of current
Device and the mode for disconnecting exchange side breaker protect connection transformer.
Connection transformer overcurrent and overloading protector 112, which are connected and are set to connection transformer series, is coupled transformation
The high-pressure side of device, such as special insurance silk are coupled the electric current of high voltage side of transformer by detection, can determine whether be coupled transformer
For overcurrent or overload, when being coupled transformer overcurrent, protective device can cause locking transverter and disconnect exchange side breaker
Preservation tactics；When being coupled transformer overload, protective device can cause alarm.
It is coupled transformer zero-sequence current protection device 113 to be set on the circuit of the ground connection one end for being coupled transformer, passes through survey
Amount is coupled the current value of transformer central point, and by way of being latched transverter and tripping exchange side breaker, protection has two
The braking function of subharmonic.
Be coupled transformer overexcitation protection device and be coupled transformer non-electricity protector be coupled transformers connected in parallel and connect,
Being coupled transformer overexcitation protection device can be configured according to the overexcitation curve that producer provides, and it is female that selection is coupled transformer alternating
Line voltage ratio and frequency ratio and delay, determine protection seting value, are such as abnormal, and can be exchanged with jump by being latched transverter
Side breaker is implemented to protect；It is different in oil level exception, smell that connection transformer non-electricity protector can detect connection transformer
Often, winding temperature anomaly etc. is coupled transformer alternating switch disconnector by tripping and implements protection in exception conditions.
AC filter protection component 12 is connected in series with alternating current filter device, to constitute alternating current filter capacitor,
The elements such as reactor and resistance and shunt capacitor group are protected, and by being latched transverter and jumping exchange side breaker, are made
It is not damaged by under-voltage or overcurrent.
Change of current bus protection component 13 is connected in parallel with reactor, and change of current bus protection component 13 passes through change of current bus differential
Protector and change of current bus over voltage protection device carry out differential protection and overvoltage protection to change of current bus equipment, are changed by measuring
Each phase voltage and electric current of device busbar are flowed, and compared with setting valve, if being abnormal, by being latched transverter and jumping exchange side
Breaker is implemented to protect to change of current busbar.
Converter unit protection device 2 is connected in series with transverter, and converter unit protection device 2 passes through transverter overcurrent protection
Device, exchange side overvoltage protection device, touches valve pulse monitor, IGBT autoprotections device and auxiliary at fast-speed direct current overvoltage protection device
Equipment protection device is helped to transverter and transverter carries out overcurrent protection with the connection line for being coupled transformer, fast direct flows through
Voltage protection, exchange side overvoltage protection touch valve pulse monitoring, IGBT autoprotections and ancillary equipment protection.When pinpointing the problems,
Can by being latched transverter and jump exchange side breaker to transverter, transverter and the part connection line that is coupled transformer with
And the equipment such as converter Control protection system implement protection.
Protection of direct current supply line device 3 is set to DC transmission line road, and protection of direct current supply line device 3 is by micro-
Pressure-failure protector, DC over-voltage protection device and DC voltage unbalance protection device is divided to carry out the under-voltage guarantor of differential to DC power transmission line
Shield, DC over-voltage protection and DC voltage unbalance protection.When pinpointing the problems, it can be exchanged with tripping by being latched transverter, is straight
Stream side breaker implements to protect to DC power transmission line.
The protection system and method for flexible direct current intelligence transmission and distribution network provided in an embodiment of the present invention, by dividing circuit
Area overlapping configuration protection, may be implemented the nothing " blind area " that flexible direct current intelligence transmission and distribution network system protection is arranged so that in event
Failure or abnormal running equipment in excision system rapidly under barrier or other abnormal conditions, prevent from damaging system or
Person infects the normal work of other parts, to protect the safety and stability of all devices in flexible direct current electrical power trans mission/distribution system to carry out.
The above is only the specific implementation mode of the present invention, is made skilled artisans appreciate that or realizing this hair
It is bright.Various modifications to these embodiments will be apparent to one skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (6)
1. a kind of protection system of flexible direct current intelligence transmission and distribution network, is applied to flexible direct current intelligence transmission and distribution network, feature exists
In the flexible direct current intelligence transmission and distribution network includes the ac bus being sequentially connected electrically, alternating-current switch, is coupled transformer, reactance
Device, current conversion station and DC power transmission line and one end ground connection, the other end are electrically connected to the friendship being coupled between transformer and reactor
Flow filter；
The protection system includes the alternating-current switch field protective device (1) being sequentially connected electrically, converter unit protection device (2) and direct current
Line protection (3), wherein：
Alternating-current switch field protective device (1) includes being coupled tranformer protection component (11), AC filter protection component
(12) and change of current bus equipment protects component (13)；
The change of current bus equipment protection component (13) includes change of current bus differential protecting device and change of current bus over voltage protection device；
The connection tranformer protection component (11) include be coupled transformer differential protection device (111), be coupled transformer overcurrent and
Overloading protector (112) is coupled transformer overexcitation protection device, is coupled transformer zero-sequence current protection device (113) and is coupled
Transformer non-electricity protector；
The connection transformer differential protection device (111) connects with transformers connected in parallel is coupled, the connection transformer overcurrent and mistake
Load protector (112) connects and is set to the high-pressure side for being coupled transformer, the connection change with transformer series are coupled
Depressor zero-sequence current protection device (113) is set on the circuit of described ground connection one end for being coupled transformer, the connection transformer
Overexcitation protection device and connection transformer non-electricity protector are coupled transformers connected in parallel connection with described；
The AC filter protection component (12) is connected in series with the alternating current filter, the change of current bus equipment protection group
Part (13) is connected in parallel with the reactor；
The converter unit protection device (2) is set in the current conversion station, and the protection of direct current supply line device (3) is set to
The DC transmission line road.
2. the protection system of flexible direct current intelligence transmission and distribution network according to claim 1, which is characterized in that the transverter
Protective device (2) includes being series at the on high-tension side transverter overcurrent protective device of transverter and being parallel to the fast of transverter both ends
Fast DC overvoltage protection device, touches valve pulse monitor, IGBT autoprotections device and ancillary equipment at exchange side overvoltage protection device
Protector.
3. the protection system of flexible direct current intelligence transmission and distribution network according to claim 1, which is characterized in that the direct current is defeated
Electric wire line protection device (3) includes the differential pressure-failure protector for being parallel to DC transmission line road, DC over-voltage protection device and straight
Galvanic electricity presses unbalance protection device.
4. a kind of guard method of flexible direct current intelligence transmission and distribution network, which is characterized in that flexible direct current intelligence transmission and distribution network point
Three locality protections, including：Alternating-current switch field areas, transverter region and DC power transmission line region, wherein：
In alternating-current switch field areas setting alternating-current switch field protective device, pass through the connection transformer of alternating-current switch field protective device
Protection component, AC filter protection component and change of current bus equipment protection component are protected be coupled transformer, ac filter respectively
Device and change of current bus equipment；
It is coupled transformer by the connection tranformer protection component protection, wherein by being coupled transformer differential protection device, connection
Tie transformer overcurrent and overloading protector, be coupled transformer overexcitation protection device, be coupled transformer zero-sequence current protection device with
And be coupled transformer non-electricity protector to be coupled transformer carry out differential protection, overcurrent and overload protection, overexcitation protection,
Zero-sequence current protection and non-ionizing energy loss；
Converter unit protection device is set in transverter region, passes through converter unit protection unit protection transverter and transverter and connection
Tie the connection line of transformer；
In DC power transmission line region, protection of direct current supply line device is set, it is straight by protection of direct current supply line unit protection
Flow transmission line of electricity；
It is described that component protection change of current bus equipment is protected by change of current bus equipment, including：Pass through change of current bus differential protecting device
Differential protection and overvoltage protection are carried out to change of current bus equipment with change of current bus over voltage protection device.
5. the guard method of flexible direct current intelligence transmission and distribution network according to claim 4, which is characterized in that described by changing
The connection line for flowing device protective device protection transverter and transverter and being coupled transformer, including：
By transverter overcurrent protective device, fast-speed direct current overvoltage protection device, exchange side overvoltage protection device, touch valve pulse prison
Control device, IGBT autoprotections device and ancillary equipment protector are real to transverter and transverter and the connection line for being coupled transformer
Row overcurrent protection, fast-speed direct current overvoltage protection, exchange side overvoltage protection, touch valve pulse monitoring, IGBT autoprotections and
Ancillary equipment is protected.
6. the guard method of flexible direct current intelligence transmission and distribution network according to claim 4, which is characterized in that described by straight
It flows line protection and protects DC power transmission line, including：
DC power transmission line is carried out by differential pressure-failure protector, DC over-voltage protection device and DC voltage unbalance protection device
Differential under-voltage protection, DC over-voltage protection and DC voltage unbalance protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610048170.6A CN105449650B (en) | 2016-01-25 | 2016-01-25 | A kind of protection system and method for flexible direct current intelligence transmission and distribution network |
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| CN201610048170.6A CN105449650B (en) | 2016-01-25 | 2016-01-25 | A kind of protection system and method for flexible direct current intelligence transmission and distribution network |
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| CN105449650B true CN105449650B (en) | 2018-09-11 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106159913B (en) * | 2016-06-30 | 2018-05-18 | 天津大学 | Multi-terminal flexible direct current system direct current fault protecting method |
| CN106786422B (en) * | 2016-12-30 | 2021-11-19 | 中国电力科学研究院 | Protection method and system for direct-current power grid partition |
| CN109038520B (en) * | 2018-09-06 | 2020-04-07 | 华北电力大学（保定） | Method for identifying AC/DC fault in converter station and protecting and coordinating AC/DC fault in converter station |
| CN109888751B (en) * | 2019-04-11 | 2021-02-12 | 南方电网科学研究院有限责任公司 | Direct-current overvoltage protection method, device and equipment for extra-high voltage direct-current transmission |
| CN111030065A (en) * | 2019-12-10 | 2020-04-17 | 平高集团有限公司 | Fault protection area setting method for multi-terminal offshore direct current wind power plant system |
| CN111342428B (en) * | 2020-02-26 | 2022-03-15 | 合肥工业大学 | Transformer protection method based on temperature characteristic |
| CN111934302A (en) * | 2020-07-31 | 2020-11-13 | 国网福建省电力有限公司电力科学研究院 | System and method for restraining single-phase fault short-circuit current applied to flexible direct-current power transmission system |
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