CN114285010A - Line protection adjustment system of self-adaptation ground connection mode - Google Patents
Line protection adjustment system of self-adaptation ground connection mode Download PDFInfo
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- CN114285010A CN114285010A CN202111577004.2A CN202111577004A CN114285010A CN 114285010 A CN114285010 A CN 114285010A CN 202111577004 A CN202111577004 A CN 202111577004A CN 114285010 A CN114285010 A CN 114285010A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention relates to a line protection adjusting system adopting a self-adaptive grounding mode, which comprises a master station management system, an information transmission system and a line protection terminal; the master station management system is used for calculating parameters to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameters; the information transmission system is used for transmitting the adjustment data and the adjustment instruction sent by the master station management system; and the line protection terminal is used for correspondingly adjusting the power distribution network according to the adjustment data and the adjustment instruction received from the information transmission system. According to the invention, the power grid can be correspondingly adjusted at the first time of switching the grounding mode, and the reliable operation of the power grid is ensured.
Description
Technical Field
The invention belongs to the field of grounding modes and protection of power systems, and particularly relates to a line protection adjusting system adopting a self-adaptive grounding mode.
Background
The grounding modes in the existing power distribution network can be generally divided into two categories, namely a low-current grounding system in which the grounding current is relatively low when the power distribution network has a single-phase grounding fault and mainly comprises a neutral point which is not grounded or is grounded through a high-resistance arc suppression coil, and a high-current grounding system in which the grounding current is relatively high when the power distribution network has a single-phase grounding fault and mainly comprises a neutral point which is directly grounded and is grounded through a small resistor. In a low-current grounding system, when a feeder line has a single-phase grounding fault, the power grid can still operate for about 2 hours without cutting off a fault line because the fault current is small. However, for a large-current grounding system, due to the fact that fault current is large, equipment cannot tolerate the fault current, and therefore failure in time removal can have serious influence on the whole power distribution network.
In an urban power grid, in order to improve the power supply reliability, a small-current grounding system, particularly the grounding of an arc suppression coil, is adopted in a plurality of substations. However, in the current urban power grid, the requirement on the appearance is higher and higher, so that more and more cables buried under the ground are adopted for the feeder, which causes that the capacitance current is larger and larger when the feeder fails, the arc suppression coil cannot be over-compensated, and the grounding arc and overvoltage are easy to generate in practical use, so that a plurality of cities start to gradually transform a transformer substation with more cable lines into a large-current grounding system, mainly the low-resistance grounding is adopted, and the fault can be quickly removed.
For transition zones of cable lines and overhead lines, the number of mixed lines of the cable lines and the overhead lines is large, and some peripheral substations are low-current grounding systems, and some substations are high-current grounding systems. The zones are often compact areas constructed in power grid engineering, topology adjustment of a power distribution network is frequent, connection relations of equipment are variable, the same equipment can be connected to a low-current grounding system originally, and the same equipment is connected to a high-current grounding system after engineering implementation or operation side adjustment.
In order to improve the power supply reliability, more and more feeders start to adopt the grading protection, and circuit protection is also configured on a circuit breaker switch at the rear stage of the feeder. After engineering implementation or operation adjustment, the feeder line rear-stage circuit breaker switches need to adjust protection fixed values in time, and need to adjust protection types in time according to different grounding modes of different power supply points and substations. Therefore, it is necessary to design a system capable of adjusting the distribution network in time according to the change of the grounding mode.
Disclosure of Invention
The invention aims to provide a line protection adjusting system of a self-adaptive grounding mode, which can correspondingly adjust a power grid at the first time of switching the grounding mode so as to ensure the reliable operation of the power grid.
In order to achieve the purpose, the invention adopts the technical scheme that:
an adaptive ground mode line protection adjustment system, comprising:
the master station management system is used for calculating parameters to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameters;
the information transmission system is used for transmitting the adjustment data and the adjustment instruction which are issued by the master station management system;
the line protection terminal is used for correspondingly adjusting the power distribution network according to the adjustment data and the adjustment instruction received from the information transmission system;
the information transmission system is connected with the master station management system, and the line protection terminal is connected with the information transmission system and the power distribution network.
The master station management system includes:
the power distribution network real-time topology analysis module is used for analyzing the power distribution network topology in real time, determining the on-off state of a switch in the power distribution network, determining a power point of any equipment and confirming the grounding mode of a transformer substation;
the protection fixed value calculation module is used for calculating starting protection types and corresponding protection fixed values of all breaker switches in the power distribution network under the current topology according to the analysis result of the real-time topology analysis module on the topology of the power distribution network;
the protection fixed value issuing module is used for transmitting the protection fixed value calculated by the protection fixed value calculating module to the information transmission system;
and the remote control command issuing module is used for transmitting the switching-on/off command of any switch in the power distribution network to the information transmission system.
The information transmission system comprises an optical fiber system, a wireless public network system and/or a wireless private network system.
The line protection terminal comprises an overcurrent protection module, a zero sequence protection module and/or a distance protection module.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the invention, the power grid can be correspondingly adjusted at the first time of switching the grounding mode, and the reliable operation of the power grid is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a line protection adjustment system of the adaptive ground system of the present invention.
Fig. 2 is a schematic diagram of a connection relationship between two different grounding modes of substation lines.
Fig. 3 is a schematic diagram of the connection relationship between the two transformer substation lines with different grounding modes after the adjustment of the transportation party.
Fig. 4 is a schematic diagram of the working principle of the line protection adjustment system of the adaptive grounding mode of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.
The first embodiment is as follows: as shown in fig. 1, a line protection adjustment system adopting a self-adaptive grounding mode includes a master station management system, an information transmission system, and a plurality of line protection terminals, where the information transmission system is connected to the master station management system, and the line protection terminals are connected to the information transmission system and a power distribution network.
And the master station management system is used for calculating parameters to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameters. The master station management system comprises a power distribution network real-time topology analysis module, a protection fixed value calculation module, a protection fixed value issuing module and a remote control command issuing module, wherein the protection fixed value calculation module is connected with the power distribution network real-time topology analysis module, the protection fixed value issuing module is connected with the protection fixed value calculation module, and the protection fixed value issuing module and the remote control command issuing module are both connected with the information transmission system. The distribution network real-time topology analysis module is used for analyzing the distribution network topology in real time, determining the on-off state of a switch in the distribution network, determining a power supply point of any equipment and confirming the grounding mode of a transformer substation. And the protection fixed value calculation module is used for calculating the protection types and the corresponding protection fixed values started by the breaker switches in the power distribution network under the current topology according to the analysis result of the real-time topology analysis module of the power distribution network on the topology of the power distribution network. And the protection fixed value issuing module is used for transmitting the protection fixed value calculated by the protection fixed value calculating module to the information transmission system. And the remote control command issuing module is used for transmitting the switching-on/off command of any switch in the power distribution network to the information transmission system.
The information transmission system is used for transmitting the adjustment data and the adjustment instruction sent by the master station management system. Information transmission systems, such as optical fiber systems, wireless public network systems and/or wireless private network systems, can transmit information between systems through currently known information transmission means and protocols.
And the line protection terminal is used for correspondingly adjusting the power distribution network according to the adjustment data and the adjustment instruction received from the information transmission system, namely performing parameter setting of a protection function or switching on and switching off operation of a switch. The line protection terminal is equipped on each switch in the line, collects data such as current and voltage at the switch, can be configured to control the switch on and off and configure various protections including overcurrent protection, such as an overcurrent protection module, a zero sequence protection module and/or a distance protection module.
Taking the line shown in fig. 2 as an example, a power supply point of a feeder line 1 is a transformer substation 1, and the transformer substation 1 adopts a low-current grounding system; the power supply point of the feeder line 2 is a transformer substation 2, and the transformer substation 2 adopts a large-current grounding system. QF1 and QF2 are substation outlet breakers, QS1, QS2, QS3 and QS4 are section switches in the normal operation mode, and QS5 is a tie switch in the normal operation mode.
When the operation mode needs to be adjusted as shown in fig. 3 due to interference of external factors, QS4 is divided into QS5, and the master station management system performs real-time topology analysis.
At this time, for the feeder 1, the original three-segment line is changed into a four-segment line, the load of QS4-QS5 segment is transferred to the feeder 1, the original high-current grounding system is changed into a small-grounding-current system, the protection fixed values set by the original QF1, QS1 and QS2 are all failed, recalculation needs to be carried out in time, and QS5 can be introduced to carry out calculation together.
For the feed line 2, the original three-segment line is changed into two segments, and the load of QS4-QS5 segments is transferred to the feed line 1, so that the original high-current grounding system is changed into a low-grounding current system. Similarly, the set protection fixed values all fail, for QS4, the QS4 does not participate in the grading protection of the feeder 2 any more, meanwhile, the substation 2 adopts a high-current grounding system, the single-phase grounding fault is generally judged by adopting zero-sequence current protection, at this time, QS4 only serves as an interconnection switch, and the related protection configuration is forbidden.
In the above process, the operation mode of the whole set of system is as shown in fig. 4, the master station management system calculates the protection setting values and protection starting types of all switches in the new operation mode, and sends the protection setting values and protection starting types to the line protection terminal through the information transmission system, and the line protection terminal starts the new setting values and new types at the same time within the setting time of the following setting values. The triggering condition for the system operation is the telecommand deflection signal of the switch.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (4)
1. A line protection adjustment system of self-adaptation ground mode which characterized in that: the line protection adjustment system adopting the self-adaptive grounding mode comprises:
the master station management system is used for calculating parameters to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameters;
the information transmission system is used for transmitting the adjustment data and the adjustment instruction which are issued by the master station management system;
the line protection terminal is used for correspondingly adjusting the power distribution network according to the adjustment data and the adjustment instruction received from the information transmission system;
the information transmission system is connected with the master station management system, and the line protection terminal is connected with the information transmission system and the power distribution network.
2. The adaptive ground-based line protection adjustment system according to claim 1, wherein: the master station management system includes:
the power distribution network real-time topology analysis module is used for analyzing the power distribution network topology in real time, determining the on-off state of a switch in the power distribution network, determining a power point of any equipment and confirming the grounding mode of a transformer substation;
the protection fixed value calculation module is used for calculating starting protection types and corresponding protection fixed values of all breaker switches in the power distribution network under the current topology according to the analysis result of the real-time topology analysis module on the topology of the power distribution network;
the protection fixed value issuing module is used for transmitting the protection fixed value calculated by the protection fixed value calculating module to the information transmission system;
and the remote control command issuing module is used for transmitting the switching-on/off command of any switch in the power distribution network to the information transmission system.
3. The adaptive ground-based line protection adjustment system according to claim 1, wherein: the information transmission system comprises an optical fiber system, a wireless public network system and/or a wireless private network system.
4. The adaptive ground-based line protection adjustment system according to claim 1, wherein: the line protection terminal comprises an overcurrent protection module, a zero sequence protection module and/or a distance protection module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111577004.2A CN114285010B (en) | 2021-12-22 | 2021-12-22 | Circuit protection adjusting system of self-adaptive grounding mode |
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| CN202111577004.2A CN114285010B (en) | 2021-12-22 | 2021-12-22 | Circuit protection adjusting system of self-adaptive grounding mode |
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