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 PDF

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Publication number
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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protection
direct current
current
transformer
transverter
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CN105449650A (en
Inventor
沈鑫
黄星
张林山
周年荣
闫永梅
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Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised 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

A kind of protection system and method for flexible direct current intelligence transmission and distribution network
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.
CN201610048170.6A 2016-01-25 2016-01-25 A kind of protection system and method for flexible direct current intelligence transmission and distribution network Active CN105449650B (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103296671A (en) * 2013-04-09 2013-09-11 国家电网公司 Overvoltage protection device and method for alternating current side of voltage source converter high voltage direct current transmission system
CN205377272U (en) * 2016-01-25 2016-07-06 云南电网有限责任公司电力科学研究院 Protection system of flexible direct current intelligence transmission & distribution electric wire netting

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103296671A (en) * 2013-04-09 2013-09-11 国家电网公司 Overvoltage protection device and method for alternating current side of voltage source converter high voltage direct current transmission system
CN205377272U (en) * 2016-01-25 2016-07-06 云南电网有限责任公司电力科学研究院 Protection system of flexible direct current intelligence transmission & distribution electric wire netting

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
±800kV特高压直流系统保护配置;李辉等;《湖南电力》;20120831;第32卷(第4期);24-28 *
南澳多端柔性直流输电示范工程系统集成设计方案;杨柳等;《南方电网技术》;20150930;第9卷(第1期);63-67 *

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