CN105449650A - Protection system and method for intelligent flexible direct-current transmission and distribution power grid - Google Patents
Protection system and method for intelligent flexible direct-current transmission and distribution power grid Download PDFInfo
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- CN105449650A CN105449650A CN201610048170.6A CN201610048170A CN105449650A CN 105449650 A CN105449650 A CN 105449650A CN 201610048170 A CN201610048170 A CN 201610048170A CN 105449650 A CN105449650 A CN 105449650A
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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
Abstract
The embodiment of the invention discloses a protection system and method for an intelligent flexible direct-current transmission and distribution power grid. The intelligent flexible direct-current transmission and distribution power grid is protected from three areas which comprise the alternating-current switching station area, the current converter area and the direct-current transmission line area. An alternating-current switching station protection device is arranged in the alternating-current switching station area, a current converter protection device is arranged in the current converter area, and a direct-current transmission line protection device is arranged in the direct-current transmission line area. By means of partition overlapped deploy protection of a line, the system of the intelligent flexible direct-current transmission and distribution power grid can be protected without blind areas, faulty or abnormal operating equipment in the system is quickly cut off in the fault or other abnormal situations, the system is protected against damage or influences on normal working of other parts are avoided, and then all equipment in the system of the intelligent flexible direct-current transmission and distribution power grid is protected to operate safely and stably.
Description
Technical field
The present invention relates to electrical power distribution system resist technology field, particularly relate to protection system and the method for a kind of flexible direct current intelligence transmission and distribution network.
Background technology
Flexible direct current intelligence transmission and distribution network technology is a kind of novel direct current transmission and distribution technology, namely in the application of direct current transmission and distribution net, converter adopts IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) valve and two level (or many level) three-phase mechanism, and use pulse modulation technology control IGBT valve cut-off situation, thus make the direct current transmission and distribution net system be made up of it overcome the multi-class problem presented in conventional direct current transmission and distribution in many aspects.
In the application plurality of advantages is presented, as system stability is strong for flexible direct current intelligence transmission and distribution network technology; The interconnected of asynchronous system can be realized; When powering to passive region, there is not commutation failure problem; Conveying active power and reactive power can independently control fast; Can built by separate periods, favorable expandability preferably; Fast recovery of power supply and black starting-up etc. after accident.
But flexible direct current intelligence transmission and distribution network system is as a kind of new technology of direct current transportation, and the safeguard measure for its circuit is still left to be desired.
Summary of the invention
Provide protection system and the method for a kind of flexible direct current intelligence transmission and distribution network in the embodiment of the present invention, lack the problem of protection to solve flexible direct current intelligence transmission and distribution network system in prior art.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
A kind of protection system of flexible direct current intelligence transmission and distribution network, be applied to flexible direct current intelligence transmission and distribution network, it is characterized in that, flexible direct current intelligence transmission and distribution network comprises the ac bus, alternating-current switch, connection transformer, reactor, current conversion station and the DC power transmission line that are electrically connected successively, and one end ground connection, the other end are electrically connected on the alternating current filter between connection transformer and reactor; Protection system comprises the alternating-current switch field protective device, converter unit protection device and the protection of direct current supply line device that are electrically connected successively, wherein: alternating-current switch field protective device comprises connection tranformer protection assembly, AC filter protection assembly and change of current bus equipment protection assembly; Connection tranformer protection assembly comprises connection transformer differential protection device, connection transformer overcurrent and overloading protector, connection transformer overexcitation protection device, connection transformer zero-sequence current protection device and connection transformer non-electricity protector; Connection transformer differential protection device is connected with connection transformers connected in parallel, connection transformer overcurrent and overloading protector are connected with connection transformer series and are arranged at the high-pressure side connecting transformer, connection transformer zero-sequence current protection device is arranged on the circuit of ground connection one end of connection transformer, and connection transformer overexcitation protection device is all connected with described connection transformers connected in parallel with connection transformer non-electricity protector; AC filter protection assembly and alternating current filter are connected in series, and change of current bus equipment protection assembly and reactor are connected in parallel; Converter unit protection device and converter are connected in series, and protection of direct current supply line device is arranged in DC power transmission line.
Preferably, change of current bus protection assembly comprises change of current bus differential protecting device and change of current bus over voltage protection device.
Preferably, converter unit protection device comprises the converter overcurrent protective device be arranged in current conversion station, fast-speed direct current overvoltage protection device, AC overvoltage protection device, touches valve pulse monitor, IGBT autoprotection device and auxiliary equipment protector.
Preferably, protection of direct current supply line device comprises the differential pressure-failure protector be set in turn in DC power transmission line, DC over-voltage protection device and direct voltage unbalance protection device.
A kind of guard method of flexible direct current intelligence transmission and distribution network, three locality protections are divided to flexible direct current intelligence transmission and distribution network, comprise: alternating-current switch field areas, converter region and DC power transmission line region, wherein: in alternating-current switch field areas, alternating-current switch field protective device is set, connection transformer, alternating current filter and change of current bus equipment is protected respectively by the connection tranformer protection assembly of alternating-current switch field protective device, AC filter protection assembly and change of current bus equipment protection assembly; By described connection tranformer protection component protection connection transformer, wherein, by connection transformer differential protection device, connection transformer overcurrent and overloading protector, connection transformer overexcitation protection device, connection transformer zero-sequence current protection device and connection transformer non-electricity protector, differential protection, overcurrent and overload protection, overexcitation protection, zero-sequence current protection and non-ionizing energy loss are carried out to connection transformer; Converter unit protection device is set in converter region, by the connection line of converter unit protection unit protection converter and converter and connection transformer; Protection of direct current supply line device is set in DC power transmission line region, by protection of direct current supply line unit protection DC power transmission line.
Preferably, by change of current bus equipment protection component protection change of current bus equipment, comprising: by change of current bus differential protecting device and change of current bus over voltage protection device, differential protection and overvoltage protection are carried out to change of current bus equipment.
Preferably; by the connection line of converter unit protection unit protection converter and converter and connection transformer, comprising: by converter overcurrent protective device, fast-speed direct current overvoltage protection device, AC overvoltage protection device, touch that valve pulse monitor, IGBT autoprotection device and the auxiliary equipment protector connection line to converter and converter and connection transformer carries out overcurrent protection, fast-speed direct current overvoltage protection, AC overvoltage protection, tactile valve pulse are monitored, IGBT autoprotection and auxiliary equipment protect.
Preferably; by protection of direct current supply line unit protection DC power transmission line, comprising: by differential pressure-failure protector, DC over-voltage protection device and direct voltage unbalance protection device, differential under-voltage protection, DC over-voltage protection and direct voltage unbalance protection are carried out to DC power transmission line.
From above technical scheme; the protection system of the flexible direct current intelligence transmission and distribution network that the embodiment of the present invention provides and method; by protecting the subregion overlay configuration of circuit; the nothing " blind area " that flexible direct current intelligence transmission and distribution network system protection is arranged can be realized; to make under fault or other abnormal conditions fault or abnormal operational outfit in rapid excision system; prevent normal work system being caused damage or infects other parts, thus in protection flexible direct current electrical power trans mission/distribution system, the safety and stability of all devices is carried out.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The protection system schematic diagram of a kind of flexible direct current intelligence transmission and distribution network that Fig. 1 provides for the embodiment of the present invention;
Illustrate:
1-alternating-current switch field protective device; 2-converter unit protection device; 3-protection of direct current supply line device; 11-connects tranformer protection assembly; 12-AC filter protection assembly, 13-change of current bus equipment protection assembly, 111-connects transformer differential protection device; 112-connects transformer overcurrent and overloading protector, and 113-connects transformer zero-sequence current protection device.
Embodiment
Technical scheme in the present invention is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
See Fig. 1, it is the protection system schematic diagram of a kind of flexible direct current intelligence transmission and distribution network that the embodiment of the present invention provides.
Flexible direct current intelligence transmission and distribution network comprises the ac bus, alternating-current switch, connection transformer, reactor, current conversion station and the DC power transmission line that are electrically connected successively, also comprise alternating current filter, alternating current filter one end ground connection, the other end are electrically connected on the wire between connection transformer and reactor.
Flexible direct current intelligence transmission and distribution network is divided into three regions, namely comprise the alternating-current switch field areas of ac bus, alternating-current switch, connection transformer, reactor and alternating current filter, comprise the converter region of current conversion station and comprise the DC power transmission line region of DC power transmission line.
As shown in Figure 1, the protection system of the flexible direct current intelligence transmission and distribution network that the embodiment of the present invention provides divides three locality protections to flexible direct current intelligence transmission and distribution network system, be included in the alternating-current switch field protective device 1 that alternating-current switch field areas is arranged, the converter unit protection device 2 arranged in converter region and the protection of direct current supply line device 3 arranged in DC power transmission line region, wherein, alternating-current switch field protective device 1 is by connection tranformer protection assembly 11, AC filter protection assembly 12 and change of current bus equipment protection assembly 13, realize connection transformer, the protection of alternating current filter and change of current bus equipment.
Connection tranformer protection assembly 11 realizes carrying out differential protection, overcurrent and overload protection, overexcitation protection, zero-sequence current protection and non-ionizing energy loss to connection transformer by connection transformer differential protection device 111, connection transformer overcurrent and overloading protector 112, connection transformer overexcitation protection device, connection transformer zero-sequence current protection device 113 and connection transformer non-electricity protector.
Connection transformer differential protection device 111 is connected with connection transformers connected in parallel; as voltmeter etc.; can detect connection transformer from the current transformer the sleeve pipe of high-pressure side to the current transformer on low-pressure side sleeve pipe fault; by detecting fundamental current difference; connection inside transformer earth fault or winding turn-to-turn short circuit can be determined whether, thus take the mode of locking converter and disconnection AC circuit breaker to protect connection transformer.
Connection transformer overcurrent and overloading protector 112 are connected in series with connection transformer and are arranged at the high-pressure side connecting transformer, as special insurance silk etc., by detecting the electric current of connection high voltage side of transformer, can judge whether connection transformer is overcurrent or overload, when connecting transformer overcurrent, protective device can cause locking converter and disconnect the Preservation tactics of AC circuit breaker; When connecting transformer overload, protective device can cause warning.
Connection transformer zero-sequence current protection device 113 is arranged on the circuit of ground connection one end of connection transformer; by measuring the current value of connection transformer central point; by the mode of locking converter and tripping AC circuit breaker, protection has the braking function of second harmonic.
Connection transformer overexcitation protection device is all connected with connection transformers connected in parallel with connection transformer non-electricity protector, the overexcitation curve that connection transformer overexcitation protection device can provide according to producer is configured, select connection transformer alternating busbar voltage ratio and frequency ratio and time delay, determine protection seting value, as there is exception, implement protection by locking converter and jumping AC circuit breaker; Connection transformer non-electricity protector can detect connection transformer in oil level exception, smell exception, winding temperature anomaly etc., in exception conditions, implements protection by tripping connection transformer alternating switch disconnector.
AC filter protection assembly 12 and alternating current filter device are connected in series; protect forming the capacitor of alternating current filter, reactor and the element such as resistance and Shunt Capacitor Unit; by locking converter with jump AC circuit breaker, make its not by under voltage or overcurrent damage.
Change of current bus protection assembly 13 and reactor are connected in parallel; change of current bus protection assembly 13 carries out differential protection and overvoltage protection by change of current bus differential protecting device and change of current bus over voltage protection device to change of current bus equipment; by measuring each phase voltage and the electric current of converter bus; and compared with setting value; if occur abnormal, by locking converter and jumping AC circuit breaker, protection is implemented to change of current bus.
Converter unit protection device 2 and converter are connected in series, converter unit protection device 2 by converter overcurrent protective device, fast-speed direct current overvoltage protection device, AC overvoltage protection device, touch that valve pulse monitor, IGBT autoprotection device and the auxiliary equipment protector connection line to converter and converter and connection transformer carries out overcurrent protection, fast-speed direct current overvoltage protection, AC overvoltage protection, tactile valve pulse are monitored, IGBT autoprotection and auxiliary equipment protect.When pinpointing the problems, implement to protect to equipment such as the part connection line of converter, converter and connection transformer and converter control protection systems by locking converter and jumping AC circuit breaker.
Protection of direct current supply line device 3 is arranged in DC power transmission line, and protection of direct current supply line device 3 carries out differential under-voltage protection, DC over-voltage protection and direct voltage unbalance protection by differential pressure-failure protector, DC over-voltage protection device and direct voltage unbalance protection device to DC power transmission line.When pinpointing the problems, exchange with tripping by locking converter, DC side circuit breaker come to DC power transmission line implement protection.
The protection system of the flexible direct current intelligence transmission and distribution network that the embodiment of the present invention provides and method; by protecting the subregion overlay configuration of circuit; the nothing " blind area " that flexible direct current intelligence transmission and distribution network system protection is arranged can be realized; to make under fault or other abnormal conditions fault or abnormal operational outfit in rapid excision system; prevent normal work system being caused damage or infects other parts, thus in protection flexible direct current electrical power trans mission/distribution system, the safety and stability of all devices is carried out.
The above is only the specific embodiment of the present invention, those skilled in the art is understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. the protection system of a flexible direct current intelligence transmission and distribution network, be applied to flexible direct current intelligence transmission and distribution network, it is characterized in that, described flexible direct current intelligence transmission and distribution network comprises the ac bus, alternating-current switch, connection transformer, reactor, current conversion station and the DC power transmission line that are electrically connected successively, and one end ground connection, the other end are electrically connected on the alternating current filter between connection transformer and reactor;
Described protection system comprise be electrically connected successively alternating-current switch field protective device (1), converter unit protection device (2) and protection of direct current supply line device (3), wherein:
Described alternating-current switch field protective device (1) comprises connection tranformer protection assembly (11), AC filter protection assembly (12) and change of current bus equipment protection assembly (13);
Described connection tranformer protection assembly (11) comprises connection transformer differential protection device (111), connection transformer overcurrent and overloading protector (112), connection transformer overexcitation protection device, connection transformer zero-sequence current protection device (113) and connection transformer non-electricity protector;
Described connection transformer differential protection device (111) is connected with connection transformers connected in parallel, described connection transformer overcurrent is connected with overloading protector (112) with connection transformer series and is arranged at the high-pressure side of described connection transformer, described connection transformer zero-sequence current protection device (113) is arranged on the circuit of ground connection one end of described connection transformer, and described connection transformer overexcitation protection device is all connected with described connection transformers connected in parallel with connection transformer non-electricity protector;
Described AC filter protection assembly (12) and described alternating current filter are connected in series, and described change of current bus equipment protection assembly (13) is connected in parallel with described reactor;
Described converter unit protection device (2) is arranged in described current conversion station, and described protection of direct current supply line device (3) is arranged in described DC power transmission line.
2. the protection system of flexible direct current intelligence transmission and distribution network according to claim 1, it is characterized in that, described change of current bus protection assembly (13) comprises change of current bus differential protecting device and change of current bus over voltage protection device.
3. the protection system of flexible direct current intelligence transmission and distribution network according to claim 1; it is characterized in that, described converter unit protection device (2) comprise be series at the on high-tension side converter overcurrent protective device of converter and be parallel to converter two ends fast-speed direct current overvoltage protection device, AC overvoltage protection device, touch valve pulse monitor, IGBT autoprotection device and auxiliary equipment protector.
4. the protection system of flexible direct current intelligence transmission and distribution network according to claim 1; it is characterized in that, described protection of direct current supply line device (3) comprises the differential pressure-failure protector be parallel in DC power transmission line, DC over-voltage protection device and direct voltage unbalance protection device.
5. a guard method for flexible direct current intelligence transmission and distribution network, is characterized in that, divides three locality protections, comprising: alternating-current switch field areas, converter region and DC power transmission line region flexible direct current intelligence transmission and distribution network, wherein:
Alternating-current switch field protective device is set in alternating-current switch field areas, protects connection transformer, alternating current filter and change of current bus equipment respectively by the connection tranformer protection assembly of alternating-current switch field protective device, AC filter protection assembly and change of current bus equipment protection assembly;
By described connection tranformer protection component protection connection transformer, wherein, by connection transformer differential protection device, connection transformer overcurrent and overloading protector, connection transformer overexcitation protection device, connection transformer zero-sequence current protection device and connection transformer non-electricity protector, differential protection, overcurrent and overload protection, overexcitation protection, zero-sequence current protection and non-ionizing energy loss are carried out to connection transformer;
Converter unit protection device is set in converter region, by the connection line of converter unit protection unit protection converter and converter and connection transformer;
Protection of direct current supply line device is set in DC power transmission line region, by protection of direct current supply line unit protection DC power transmission line.
6. the guard method of flexible direct current intelligence transmission and distribution network according to claim 5, is characterized in that, described by change of current bus equipment protection component protection change of current bus equipment, comprising:
By change of current bus differential protecting device and change of current bus over voltage protection device, differential protection and overvoltage protection are carried out to change of current bus equipment.
7. the guard method of flexible direct current intelligence transmission and distribution network according to claim 5, it is characterized in that, the described connection line passing through converter unit protection unit protection converter and converter and connection transformer, comprising:
By converter overcurrent protective device, fast-speed direct current overvoltage protection device, AC overvoltage protection device, touch that valve pulse monitor, IGBT autoprotection device and the auxiliary equipment protector connection line to converter and converter and connection transformer carries out overcurrent protection, fast-speed direct current overvoltage protection, AC overvoltage protection, tactile valve pulse are monitored, IGBT autoprotection and auxiliary equipment protect.
8. the guard method of flexible direct current intelligence transmission and distribution network according to claim 5, is characterized in that, described by protection of direct current supply line unit protection DC power transmission line, comprising:
By differential pressure-failure protector, DC over-voltage protection device and direct voltage unbalance protection device, differential under-voltage protection, DC over-voltage protection and direct voltage unbalance protection are carried out to DC power transmission line.
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| 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 CN105449650B (en) | 2018-09-11 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106159913A (en) * | 2016-06-30 | 2016-11-23 | 天津大学 | Multi-terminal flexible direct current system direct current fault protecting method |
| CN106786422A (en) * | 2016-12-30 | 2017-05-31 | 中国电力科学研究院 | A kind of guard method and system for direct current network subregion |
| CN109038520A (en) * | 2018-09-06 | 2018-12-18 | 华北电力大学（保定） | The identification and its protection coordination method of alternating current-direct current failure in a kind of converter station |
| CN109888751A (en) * | 2019-04-11 | 2019-06-14 | 南方电网科学研究院有限责任公司 | A kind of DC overvoltage protection method, apparatus, the equipment of 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 |
| CN111342428A (en) * | 2020-02-26 | 2020-06-26 | 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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| CN103296671B (en) * | 2013-04-09 | 2016-08-10 | 国家电网公司 | For flexible direct current power transmission system AC overvoltage protection and guard method |
| 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 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106159913A (en) * | 2016-06-30 | 2016-11-23 | 天津大学 | Multi-terminal flexible direct current system direct current fault protecting method |
| CN106159913B (en) * | 2016-06-30 | 2018-05-18 | 天津大学 | Multi-terminal flexible direct current system direct current fault protecting method |
| CN106786422A (en) * | 2016-12-30 | 2017-05-31 | 中国电力科学研究院 | A kind of guard method and system for direct current network subregion |
| 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 |
| CN109038520A (en) * | 2018-09-06 | 2018-12-18 | 华北电力大学（保定） | The identification and its protection coordination method of alternating current-direct current failure in a kind of converter station |
| 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 |
| CN109888751A (en) * | 2019-04-11 | 2019-06-14 | 南方电网科学研究院有限责任公司 | A kind of DC overvoltage protection method, apparatus, the equipment of 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 |
| CN111342428A (en) * | 2020-02-26 | 2020-06-26 | 合肥工业大学 | Transformer protection method based on temperature characteristic |
| 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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