CN114285010B - Circuit protection adjusting system of self-adaptive grounding mode - Google Patents
Circuit protection adjusting system of self-adaptive grounding mode Download PDFInfo
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- CN114285010B CN114285010B CN202111577004.2A CN202111577004A CN114285010B CN 114285010 B CN114285010 B CN 114285010B CN 202111577004 A CN202111577004 A CN 202111577004A CN 114285010 B CN114285010 B CN 114285010B
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- 230000004224 protection Effects 0.000 title claims abstract description 80
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
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- 230000011664 signaling Effects 0.000 claims description 2
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention relates to a line protection adjusting system of 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 carrying out parameter calculation required to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameter calculation; the information transmission system is used for transmitting the adjustment data and the adjustment instruction 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. According to the invention, the power grid can be correspondingly adjusted at the first time of the grounding mode switching, 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 circuit protection adjusting system of a self-adaptive grounding mode.
Background
At present, the grounding modes in the power distribution network can be generally divided into two major types, namely a small-current grounding system, namely the grounding current is smaller when the power distribution network has single-phase grounding faults, the grounding system mainly comprises neutral points which are not grounded or are grounded through high-resistance arc suppression coils, and the other type is a large-current grounding system, namely the grounding current is larger when the power distribution network has single-phase grounding faults, and the grounding system mainly comprises neutral points which are directly grounded through small resistors. In the case of a low current grounding system, when a feeder line has a single-phase earth fault, the power grid can still operate for about 2 hours without cutting off the fault line due to the small fault current. However, for a high-current grounding system, because the fault current is large, the equipment cannot withstand the fault current, and therefore, the fault is not timely removed, so that the whole power distribution network is seriously affected.
In an urban power grid, in order to improve the power supply reliability, a small-current grounding system, particularly an arc suppression coil, is adopted in many substations. However, in the current urban power grid, the attractive requirements are higher and higher, so that the feeder adopts a cable form buried underground more and more, the capacitance current is larger and larger when the feeder fails, the arc suppression coil cannot overcompensate, and grounding arc and overvoltage are easy to generate in actual use, so that a plurality of cities are gradually transformed into a large-current grounding system for substations with more cable lines, mainly small-resistance grounding is realized, and the faults can be rapidly removed.
For the transition zone of the cable line and the overhead line, the mixed lines of the cable line and the overhead line are more, and some peripheral substations are small-current grounding systems, and some peripheral substations are large-current grounding systems. The area is also often a dense area for power grid engineering construction, the topology adjustment of the power distribution network is frequent, the connection relation of equipment is changeable, the same equipment can be originally connected to a small-current grounding system, and the equipment becomes connected to a large-current grounding system after engineering implementation or operation party adjustment.
In order to improve the power supply reliability, more and more feeder lines begin to adopt grading protection, and a feeder line back-end circuit breaker switch is also provided with line protection. After engineering implementation or operation side adjustment, the feeder line post-stage breaker switches need to timely adjust protection fixed values, and also need to timely adjust protection types according to different grounding modes of transformer substations at different power points. Therefore, it is necessary to design a system that can adjust the distribution network accordingly in time according to the changing situation 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 grounding mode switching so as to ensure the reliable operation of the power grid.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a line protection conditioning system of adaptive grounding, comprising:
the master station management system is used for carrying out parameter calculation required to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameter calculation;
the information transmission system is used for transmitting the adjustment data and the adjustment instruction 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 comprises:
the power distribution network real-time topology analysis module is used for analyzing the power distribution network topology in real time, determining the switching state of a switch in the power distribution network, determining the power point of any equipment and confirming the grounding mode of a transformer substation;
the protection constant value calculation module is used for calculating the starting protection types and the corresponding protection constant values of all the breaker switches in the power distribution network under the current topology according to the analysis result of the power distribution network 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;
the remote control command issuing module is used for transmitting the switching instruction 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 the grounding mode switching, and the reliable operation of the power grid is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a line protection adjustment system with adaptive grounding according to the present invention.
Fig. 2 is a schematic diagram of the circuit connection relationship of two different grounding modes of the transformer substation.
Fig. 3 is a schematic diagram of the circuit connection relationship of two transformer substations in different grounding modes after the operation side is adjusted.
Fig. 4 is a schematic diagram of the working principle of the line protection adjusting system with the adaptive grounding mode according to the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
Embodiment one: as shown in figure 1, the line protection adjustment system in a self-adaptive grounding mode comprises a master station management system, an information transmission system and a plurality of line protection terminals, wherein the information transmission system is connected with the master station management system, and the line protection terminals are connected with the information transmission system and a power distribution network.
The master station management system is used for carrying out parameter calculation required to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameter calculation. 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 connected with the information transmission system. The power distribution network real-time topology analysis module is used for analyzing the power distribution network topology in real time, determining the switching state of a switch in the power distribution network, determining the power point of any equipment and confirming the grounding mode of a transformer substation. The protection fixed value calculation module is used for calculating the starting protection types and the corresponding protection fixed values of all the breaker switches in the power distribution network under the current topology according to the analysis result of the power distribution network real-time topology analysis module on the power distribution network. The protection constant value issuing module is used for transmitting the protection constant value calculated by the protection constant value calculating module to the information transmission system. The remote control command issuing module is used for transmitting the switching 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 issued by the master station management system. Information transmission systems may transmit information between systems by means of currently known information transmission means and protocols, such as information transmission systems including fiber optic systems, wireless public network systems, and/or wireless private network systems.
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 operation of a switch. The line protection terminal is arranged on each switch in the line, collects data such as current, voltage and the like at the switch, can be configured to control the switch to be opened and closed, and is configured with various protections including overcurrent protection, such as the line protection terminal comprises an overcurrent protection module, a zero sequence protection module and/or a distance protection module.
Taking a circuit shown in fig. 2 as an example, a power point of a feeder line 1 is a transformer substation 1, and the transformer substation 1 adopts a low-current grounding system; the power point of the feeder line 2 is a transformer substation 2, and the transformer substation 2 adopts a high-current grounding system. QF1 and QF2 are transformer substation outlet breakers, QS1, QS2, QS3 and QS4 are segment switches in a normal operation mode, and QS5 is a contact switch in the normal operation mode.
When the operation mode is required to be adjusted as shown in fig. 3 due to the interference of external factors, QS4 and QS5 are combined, and the master station management system performs real-time topology analysis.
At this time, for the feeder line 1, the original three-segment line is changed into four segments, the load of the QS4-QS5 segments is transferred to the feeder line 1, the original high-current grounding system is changed into a small-current grounding system, the protection fixed values set by the original QF1, the original QS1 and the original QS2 are all invalid, and the protection fixed values need to be recalculated in time, and the protection fixed values can be introduced into the QS5 to be calculated together.
For the feeder line 2, the original three-segment line is changed into two segments, and the load of the QS4-QS5 segments is transferred to the feeder line 1, and the original high-current grounding system is changed into a small-current grounding system. Likewise, the set protection constant values are all disabled, and for the QS4, the protection of the feeder line 2 in a grading manner is not participated, meanwhile, the substation 2 adopts a high-current grounding system, and the single-phase grounding fault is generally determined by adopting zero-sequence current protection, at this time, the QS4 only serves as a tie switch, and the related protection configuration is disabled.
In the above process, the whole set of system operation modes are shown in fig. 4, the master station management system calculates protection fixed values and types of starting protection of all switches in a new operation mode, the protection fixed values and types are issued to the line protection terminal through the information transmission system, and the line protection terminal starts new fixed values and types at the same time according to set time in the issued fixed values. The triggering condition of the system operation is the remote signaling displacement signal of the switch.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (3)
1. A line protection adjustment system of self-adaptive grounding mode is characterized in that: the line protection adjustment system of the self-adaptive grounding mode comprises:
the master station management system is used for carrying out parameter calculation required to be adjusted according to the real-time topology of the power distribution network and issuing adjustment data and adjustment instructions according to the parameter calculation;
the information transmission system is used for transmitting the adjustment data and the adjustment instruction 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 line protection adjusting system of the self-adaptive grounding mode correspondingly adjusts the power distribution network at the first time of switching of the grounding mode, and the triggering condition of system operation is a remote signaling deflection signal of a switch;
the master station management system comprises:
the power distribution network real-time topology analysis module is used for analyzing the power distribution network topology in real time, determining the switching state of a switch in the power distribution network, determining the power point of any equipment and confirming the grounding mode of a transformer substation;
the protection constant value calculation module is used for calculating the starting protection types and the corresponding protection constant values of all the breaker switches in the power distribution network under the current topology according to the analysis result of the power distribution network 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;
the remote control command issuing module is used for transmitting the switching instruction of any switch in the power distribution network to the information transmission system.
2. The adaptive ground mode line protection adjustment system of claim 1, wherein: the information transmission system comprises an optical fiber system, a wireless public network system and/or a wireless private network system.
3. The adaptive ground mode line protection adjustment system of 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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| 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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| CN114285010B true CN114285010B (en) | 2024-02-20 |
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