CN110609206B - Fault identification method for high-voltage direct-current transmission system - Google Patents
Fault identification method for high-voltage direct-current transmission system Download PDFInfo
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Abstract
A method for judging and identifying fault areas of a high-voltage direct-current power transmission system belongs to the technical field of power system dispatching automation and comprises the following steps: establishing various mapping relations; receiving control and protection signals in the direct current transmission fault, and receiving a switch displacement signal of a direct current transmission system; dividing the grade of the control and protection signal, and intercepting the control and protection signal of a preset time period after a fault when the control and protection signal is in emergency; screening out the protection type of the relay protection action element; identifying a direct-current transmission fault area according to the established mapping relation; identifying the running modes of the direct current system before and after the fault according to the established mapping relation; and outputting a fault report of the direct current power transmission system. The method solves the problem that the direct current transmission system fault is judged by manual experience for a long time and has low efficiency, and provides a new means for quickly positioning the fault area of the direct current transmission system.
Description
Technical Field
The invention belongs to the technical field of power system dispatching automation, and particularly relates to a fault identification method for a high-voltage direct-current power transmission system.
Background
The high-voltage direct-current transmission technology develops rapidly in recent years, and the high-voltage direct-current transmission system has the transmission capability of long distance, large capacity and low loss, and is low in circuit cost and good in control performance. The high-voltage direct-current transmission technology gradually becomes an important means for solving high-voltage, large-capacity and long-distance power transmission and power grid interconnection in each power country with remarkable economic benefit and social benefit. Along with the effect that high voltage direct current transmission technology played in the electric wire netting is more and more serious, how to improve the security and the reliability of system operation also become the problem that await the solution urgently, because direct current system is more complicated, distribution range is wide, the interact between the alternating current-direct current system is more complicated, the probability that complicated system broke down is great, very easily make relay protection device and control circuit malfunction, lead to the interrupt of direct current power transmission, influence whole alternating current-direct current system's steady operation, cause big trouble hidden danger for electric power system, and then cause more serious electric power accident.
The method has the advantages that the fault property of the direct-current transmission system is rapidly identified, and the fault area is positioned, so that the method is an effective way for timely processing the fault of the direct-current transmission system and eliminating the hidden danger of the operation of the power grid. The traditional direct current power grid fault identification seriously depends on modes such as manual inspection and the like to determine a fault area, the efficiency is low, along with the development of an intelligent power grid, the automation level of power grid operation is continuously improved, and the online monitoring technology and the identification of complex direct current system faults become possible. The method can effectively improve the efficiency of judging the direct-current transmission fault.
Disclosure of Invention
The principle of the method is that based on relay protection configuration of each link of a direct current transmission system, a corresponding relation between a relay protection action element and a fault area is established, and when a fault of the direct current transmission system occurs, the fault area of the direct current transmission system is judged according to signals generated by a relay protection and control system. The present invention adopts the following scheme.
A method for identifying faults of a high-voltage direct-current power transmission system comprises the following specific steps:
step 1: establishing various mapping relations, including: establishing a mapping relation between a relay protection action element and a control and protection signal, establishing a mapping relation between the relay protection action element and a fault area of the high-voltage direct-current power transmission system, and establishing a mapping relation between an operation mode of the high-voltage direct-current power transmission system and each switch position;
step 2: receiving control and protection signals in the high-voltage direct-current transmission fault, and receiving switch deflection signals of the high-voltage direct-current transmission system;
and step 3: dividing the grade of the control and protection signals, and intercepting the control and protection signals of a set time period after a fault when the control and protection signals are in emergency;
and 4, step 4: according to the mapping relation between the relay protection action element and the control and protection signals, manually screening out the specific protection type of the relay protection action element;
and 5: identifying a high-voltage direct-current power transmission fault area according to a mapping relation between the relay protection action element and the high-voltage direct-current power transmission system fault area and the identified protection type of the relay protection action element;
step 6: identifying the operation modes of the high-voltage direct-current system before and after a fault according to the received switch deflection signals of the high-voltage direct-current transmission system and the mapping relation between the operation mode of the direct-current transmission system and the positions of the switches;
and 7: outputting a DC power transmission system fault report comprising: high-voltage direct-current transmission fault region and high-voltage direct-current system operation mode before and after the fault.
In the step 1, the relay protection action element information specifically includes a mapping relationship between the relay protection action element and a fault area of the dc power transmission system: protected device type, protection type, corresponding fault type.
The fault area of the high-voltage direct-current transmission system is divided into 10 protection areas, if a certain protection area is identified to have a fault, the protection area is called as a fault area, and the protection area comprises: the protection device comprises a converter protection area, a polar bus protection area, a neutral bus protection area, a direct current filter protection area, a direct current line protection area, a bipolar protection area, a grounding electrode lead protection area, a converter connecting wire protection area, a converter transformer protection area and an alternating current filter protection area.
The mapping relationship between the operation mode of the high-voltage direct-current power transmission system and the positions of the switches in the step 1 comprises the following steps: and the corresponding relation between the operation mode and the wiring mode of the direct current system and the switch number.
In step 3, the dividing of the control and protection signal level intercepts the control and protection signal of the time period required by the fault according to the signal level, and specifically includes: dividing the control and protection signal grades according to the importance of the control and protection signals, comprising: and (3) emergently, alarming and slightly, intercepting information of the control and protection signals in a preset time period after receiving the control and protection signals when the control and protection signals are emergent, turning to the step 4 to start identification, and returning to the step 2 to continuously receive the control and protection signals in the high-voltage direct-current power transmission fault and simultaneously receive switch and disconnecting link displacement signals of the high-voltage direct-current power transmission system when the control and protection signals are non-emergent.
The beneficial technical effects are as follows:
the method solves the problem that the fault judgment of the direct current power transmission system depends on manual and visual judgment for a long time and the efficiency is low, avoids the problem of information waste that a large number of direct current system signals cannot be effectively utilized, and explores a feasible new road for the application of relay protection equipment data in the direct current power transmission system.
Drawings
Fig. 1 is a flowchart of a method for identifying a fault of a high-voltage direct-current power transmission system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings. The invention provides a fault identification method for a high-voltage direct-current power transmission system, which comprises the following steps: and acquiring signals of a control and relay protection device in the direct current power transmission system, uniformly and comprehensively processing output information of relay protection equipment at a dispatching end according to relay protection functional elements configured for faults in different links in the direct current power transmission system, and identifying a direct current power transmission fault area. The application discloses a method for identifying a fault of a high-voltage direct-current power transmission system, as shown in fig. 1, the method comprises the following steps:
step 1: establishing various mapping relations, including: establishing a mapping relation between a relay protection action element and a control and protection signal, establishing a mapping relation between the relay protection action element and a fault area of the high-voltage direct-current power transmission system, and establishing a mapping relation between an operation mode of the high-voltage direct-current power transmission system and each switch position;
in the step 1, the relay protection action element information specifically includes a mapping relationship between the relay protection action element and a fault area of the high-voltage direct-current power transmission system: the type of the protected equipment, the protection type and the corresponding fault type;
the fault area of the hvdc transmission system is divided into 10 protection zones, and if a certain protection zone is identified as faulty, the protection zone is called as a fault area, as shown in table 1, the protection zone includes: the protection device comprises a converter protection area, a polar bus protection area, a neutral bus protection area, a direct current filter protection area, a direct current line protection area, a bipolar protection area, a grounding electrode lead protection area, a converter connecting wire protection area, a converter transformer protection area and an alternating current filter protection area.
TABLE 1 DC POWER TRANSMISSION SYSTEM FAULT REGION SEPARATION
The mapping relationship between the operation mode of the direct-current power transmission system and the positions of the switches in the step 1 includes: operation mode, wiring mode and switch number.
The direct current transmission system consists of a plurality of links, including an alternating current area, a converter transformer, a converter, a filter, a direct current circuit, a grounding circuit, a bypass, a plurality of inter-converter connecting circuits and the like. One or more sets of relay protection functions are configured for the fault of each link, and the relay protection functions are used for cutting off the fault when the fault occurs. As shown in table 1, the dc transmission system is divided into 10 protected areas, i.e., areas where a failure may occur. Aiming at the relay protection function configured in each region, the table 1 and the table 2 are used for establishing a mapping relation between a relay protection action element and a fault region of the high-voltage direct-current power transmission system, and the mapping relation between various faults and the relay protection action element in a fault region of the converter is described in the table 2, wherein M represents a strong mapping relation, O represents a possible mapping relation, and X represents no mapping relation;
TABLE 2 mapping relationship between various faults and relay protection action elements in converter fault area
As shown in table 3, the dc power transmission system can be classified into operation modes such as bipolar, unipolar metal return, unipolar earth return, etc. according to different switch and knife position combinations, where C1-C46 are numbers of switch knives in the dc power transmission system. And aiming at each operation mode, the device corresponds to the position combination of various switch disconnecting links. After the mapping relation between the operation mode of the direct current power transmission system and the positions of the relevant switches and the disconnecting links is established, the current operation mode can be identified according to the positions of the switches and the disconnecting links in the current direct current power transmission system.
Table 3 establishes a mapping relationship between the operation mode of the HVDC transmission system and the positions of the switches
Step 2: receiving control and protection signals in the direct current transmission fault, and receiving a switch displacement signal of a direct current transmission system;
and step 3: dividing the grade of the control and protection signal, and intercepting the control and protection signal of a preset time period after a fault when the control and protection signal is in emergency;
the method specifically comprises the following steps: dividing the control and protection signal grades according to the importance of the control and protection signals, comprising: and (3) emergently, alarming and slightly, intercepting information of the control and protection signals within a preset time period T after receiving the control and protection signals when the control and protection signals are emergent, turning to the step 4 to start identification, and returning to the step 2 to continuously receive the control and protection signals in the direct current transmission fault and simultaneously receive the direct current transmission system switch and disconnecting link displacement signals when the control and protection signals are non-emergent.
In the invention, information levels are divided into 'accident, abnormity, out-of-limit, deflection and notification' in QGDW 11021-2013 transformer substation regulation and control data interaction specification 6.3.1, wherein the emergency is an accident in the information levels, the alarm is an abnormity in the information levels, and the slight is out-of-limit, deflection and notification in the information levels;
numerous direct current control and relay protection equipment information can be generated in a primary direct current system fault, a large amount of equipment operation information can be generated in normal operation, and information which is not classified and processed cannot be applied to identification of fault information. Therefore, the information of the direct current control and relay protection equipment is divided into four categories of emergency, warning, slight and normal according to the importance of the signals, wherein the emergency category comprises relay protection action signals and control signals of the control equipment. The method is used for starting triggering the fault analysis process when the fault of the direct current transmission system occurs. And meanwhile, according to the description of the action signal of the relay protection, establishing a mapping relation between the action signal of the relay protection and the action functional element, and using the mapping relation for semantic recognition of the action signal of the relay protection.
When a direct current fault occurs, the in-station direct current control system and the relay protection equipment transmit the operation information of the equipment to the dispatching end monitoring system through the station control layer network, and the dispatching end monitoring system integrates the signals into a fault information packet according to the type grade of the signals as a trigger condition and according to the time sequence. Meanwhile, the dispatching end monitoring system collects the switch knife switch position information of the transformer substation alternating current-direct current system in real time;
when a direct current fault occurs, the corresponding direct current control and relay protection device acts according to preset logic, the operation of a direct current transmission system is adjusted, signals of the action and the adjustment are sent to a direct current substation control layer, a monitoring system of a dispatching end collects the signals, and a fault integration and analysis function is triggered according to the grade of the signals, for example: triggered when a signal of an emergency level is received. The information of the direct current control device and the relay protection device at a later period of time of the signal is integrated into a primary fault information packet, and because the logics of the direct current control device and the relay protection device are different, the method adopts the experience time which can be manually configured as an information interception standard, for example, 20 seconds. When the signals are collected, the position information of the switch knife switch of the alternating current and direct current system of the transformer substation can be collected in real time.
And 4, step 4: screening out the protection type of the relay protection action element according to the mapping relation between the control of the relay protection action element and the protection signal; as shown in table 4, a relay protection operation element may correspond to a plurality of relay protection signals, and the names of the relay protection signal descriptions do not have corresponding specifications, so that a mapping relationship between the relay protection signal descriptions and the relay protection operation elements is established.
TABLE 4 mapping relationship between relay protection action element and relay control and protection signal
| Relay protection signal description | Relay protection operation element |
| Valve short-circuit protection X-lock | Valve short circuit protection |
| Valve short-circuit protection S lock | Valve short circuit protection |
| Valve short circuit protection trip | Valve short circuit protection |
| Valve short-circuit protection isolation valve group | Valve short circuit protection |
| Valve group differential protection alarm | Differential protection for current converter |
| Differential protection S lock of valve group | Differential protection for current converter |
| Differential protection trip of valve group | Differential protection for current converter |
| Differential protection locking pole of valve group | Differential protection for current converter |
| …… | …… |
And 5: identifying a high-voltage direct-current power transmission fault area according to a mapping relation between the relay protection action element and the high-voltage direct-current power transmission system fault area and the identified protection type of the relay protection action element;
step 6: identifying the operation modes of the high-voltage direct-current system before and after the fault according to the received switch deflection signals of the direct-current power transmission system and the mapping relation between the operation mode of the high-voltage direct-current power transmission system and the positions of the switches;
and 7: outputting a fault report for a high voltage direct current transmission system comprising: high-voltage direct-current transmission fault region and direct-current system operation modes before and after the fault.
According to the change of the fault area and the operation mode of the direct current transmission system, analysis protection for describing the whole direct current transmission fault process is formed and used for quickly judging the fault property and timely recovering power supply.
As an example, in the implementation process of the fault identification method for the high-voltage direct-current power transmission system, various mapping relationships are established according to the flow of step 1, as shown in tables 1, 2 and 3; receiving signals according to the flow of the step 2; obtaining fault information according to the flow of the step 3; according to step 4, if the received packet is as shown in table 4, for example, the first row information of the first column in table 4 is received: and (3) locking the valve short-circuit protection X, and manually screening the protection types of the relay protection action elements according to the corresponding relation in the table 4, wherein the protection types are as follows: valve short circuit protection; according to the flow of step 5, as shown in table 2, the fault area corresponding to the valve short-circuit protection is: a converter fault region; according to the process of step 6, according to the received switch and disconnecting link deflection signals of the high-voltage direct-current power transmission system, the corresponding state of the corresponding switch number before the fault is as follows: the C01-C17 switches are all closed, and the corresponding state of the corresponding switch number after the fault is as follows: C01-C8 are closed, and C9-C17 are opened; according to the corresponding relation in table 3, the operation mode of the pre-fault high-voltage direct-current transmission system is as follows: complete bipole in the bipole; the operation mode after the fault is as follows: 1/2 dipoles among dipoles; step 7, outputting a fault report of the high-voltage direct-current transmission system, including: the fault area is: a converter fault region; the operation mode of the high-voltage direct-current transmission system before the fault is as follows: complete bipole in the bipole; the operation mode after the fault is as follows: 1/2 dipoles among dipoles;
while the best mode for carrying out the invention has been described in detail and illustrated in the accompanying drawings, it is to be understood that the foregoing description is only illustrative of the presently preferred embodiments of the invention and that no limitation on the scope of the invention is thereby intended, such an improvement or modification being obvious to one skilled in the art.
Claims (4)
1. A fault identification method for a high-voltage direct-current power transmission system is characterized by comprising the following specific steps:
step 1: establishing various mapping relations, including: establishing a mapping relation between a relay protection action element and a control and protection signal, establishing a mapping relation between the relay protection action element and a fault area of the high-voltage direct-current power transmission system, and establishing a mapping relation between an operation mode of the high-voltage direct-current power transmission system and each switch position;
step 2: receiving control and protection signals in the high-voltage direct-current transmission fault, and receiving switch and disconnecting link deflection signals of the high-voltage direct-current transmission system;
and step 3: dividing the control and protection signal grades according to the importance of the control and protection signals, comprising: emergency, alarm and slight, when the control and protection signal is emergency, intercepting the information of the control and protection signal of a preset time period T after the fault, and turning to the step 4 to start identification; when the received control and protection signals are non-emergency, returning to the step 2 to continue receiving the control and protection signals in the high-voltage direct-current transmission fault, and simultaneously receiving switch and disconnecting link deflection signals of the high-voltage direct-current transmission system;
and 4, step 4: screening out the specific protection type of the relay protection action element according to the mapping relation between the relay protection action element and the control and protection signal;
and 5: identifying a fault area of the high-voltage direct-current power transmission system according to a mapping relation between the relay protection action element and the fault area of the high-voltage direct-current power transmission system and the identified protection type of the relay protection action element;
step 6: identifying the operation modes of the high-voltage direct-current transmission system before and after a fault according to the received switch deflection signal of the high-voltage direct-current transmission system and the mapping relation between the operation mode of the high-voltage direct-current transmission system and the positions of the switches;
and 7: outputting a fault report for a high voltage direct current transmission system comprising: the high-voltage direct-current transmission system is operated in a fault area and before and after the fault.
2. The method of fault identification for an hvdc transmission system in accordance with claim 1, wherein:
in the step 1, the relay protection action element information specifically includes a mapping relationship between the relay protection action element and a fault area of the high-voltage direct-current power transmission system: protected device type, protection type, corresponding fault type.
3. The method of fault identification for an hvdc transmission system according to claim 1 or claim 2, wherein:
the fault area of the high-voltage direct-current transmission system is divided into 10 protection areas, if a certain protection area is identified to have a fault, the protection area is called as a fault area, and the protection area comprises: the protection device comprises a converter protection area, a polar bus protection area, a neutral bus protection area, a direct current filter protection area, a direct current line protection area, a bipolar protection area, a grounding electrode lead protection area, a converter connecting wire protection area, a converter transformer protection area and an alternating current filter protection area.
4. The method of fault identification for an hvdc transmission system in accordance with claim 1, wherein:
the mapping relationship between the operation mode of the high-voltage direct-current power transmission system and the positions of the switches in the step 1 comprises the following steps: and the corresponding relation between the operation mode and the wiring mode of the high-voltage direct-current power transmission system and the switch number.
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| CN111175602A (en) * | 2020-01-03 | 2020-05-19 | 云南电网有限责任公司电力科学研究院 | Direct-current power transmission protection test system and method |
| CN113203899A (en) * | 2021-04-21 | 2021-08-03 | 国网安徽省电力有限公司电力科学研究院 | Converter station fault discrimination system and method based on fault recording |
| CN114285005B (en) * | 2021-10-27 | 2025-01-14 | 国网浙江省电力有限公司海宁市供电公司 | A method for rapid fault isolation of a common DC bus system |
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| KR101050550B1 (en) * | 2009-12-29 | 2011-07-19 | 주식회사 효성 | Fault point detection method of transmission line using secondary difference of traveling wave signal |
| CN102707194B (en) * | 2012-05-17 | 2015-03-25 | 中国电力科学研究院 | Power distribution network broken line fault location method |
| WO2016191187A1 (en) * | 2015-05-27 | 2016-12-01 | University Of Pittsburgh-Of The Commonwealth System Of Higher Education | Communication-less fault section identification for hybrid hvdc transmission systems |
| CN106646140B (en) * | 2017-01-25 | 2019-07-12 | 国网四川省电力公司电力科学研究院 | HVDC transmission line internal fault external fault recognition methods based on measurement wave impedance |
| JP6804358B2 (en) * | 2017-03-27 | 2020-12-23 | 三菱電機株式会社 | Single point of failure indicator |
| CN107453387B (en) * | 2017-08-24 | 2020-01-14 | 中国南方电网有限责任公司 | Power transmission control method and flexible direct current power transmission device |
| DE102017215006A1 (en) * | 2017-08-28 | 2019-02-28 | Siemens Aktiengesellschaft | Detecting a fault in a DC transmission system |
| CN108169612A (en) * | 2017-12-29 | 2018-06-15 | 全球能源互联网研究院有限公司 | The localization method of overhead line DC transmission system DC short trouble |
| CN108490369B (en) * | 2018-03-07 | 2019-03-15 | 西南交通大学 | HVDC transmission system inverter fast fault locating method |
| CN108683160B (en) * | 2018-04-28 | 2020-01-14 | 西安理工大学 | Transient energy protection method for fault current of direct-current transmission line |
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| CN109507526B (en) * | 2018-10-29 | 2020-01-07 | 山东大学 | Fault diagnosis method for distribution network based on synchrophasor measurement and covariance matrix theory |
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| CN109270407B (en) * | 2018-11-16 | 2022-02-25 | 国网山东省电力公司电力科学研究院 | Fault identification method for UHVDC transmission lines based on multi-source information fusion |
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