CN113113917A - 10KV power distribution network system - Google Patents
10KV power distribution network system Download PDFInfo
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- CN113113917A CN113113917A CN202010033512.3A CN202010033512A CN113113917A CN 113113917 A CN113113917 A CN 113113917A CN 202010033512 A CN202010033512 A CN 202010033512A CN 113113917 A CN113113917 A CN 113113917A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a 10KV power distribution network system which comprises a 10KV voltage distribution line, a transformer substation, a switch station, a distribution room and control protection equipment, wherein the 10KV power distribution network system further comprises a reactive compensation device, the reactive compensation device comprises a passive reactive compensation module, an active reactive compensation module and a control module, the capacity of the active reactive compensation module is equal to the maximum capacity level difference between the passive public service compensation modules, the passive reactive compensation module and the active compensation module are connected into a power grid in parallel through a vertical bus bar through the control module, the passive reactive compensation module comprises a plurality of reactive compensation units, the active reactive compensation module adopts a static reactive generator, and the control module comprises a reactive compensation control unit, a first optical coupling isolation unit, a second optical coupling isolation unit, a reactive generator control unit and a first controller.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to a 10KV power distribution network system.
Background
The power system is composed of five links of power generation, power transformation, power transmission, power distribution, power utilization and the like. In an electric power system, various types of large numbers of electric devices are closely connected together by electric lines. The five links of power generation, power transformation, power transmission, power distribution and power utilization are linked, balanced in real time and impossible to lack, and accidents happen anywhere in the power system, which may have great influence on the operation of the power system.
The 10KV power distribution network system is a part of a power system, whether the system can safely, stably and reliably operate or not is directly related to the smoothness of power consumption of enterprises and the normal operation of the power system, however, the contradiction of lagging power grid development formed by long-term accumulation is still outstanding, the power grid structure is weak, especially the extra-high voltage and the two ends of the power distribution network are weak, in the primary stage of power grid construction, a medium-low voltage power distribution network is basically constructed along with the requirements of users and is greatly influenced by investors, and the power distribution network system and the grid structure in the power distribution network system are lack of reasonable design, so that the power supply reliability of the 10KV power distribution network is low.
In addition, because the impedance of the network element of the power system is mainly inductive, the voltage amplitude of the receiving end is unstable when the reactive power is transmitted in the power grid, which is the transmission capability of the transmission line is reduced, therefore, the balance of the reactive power in the power system is the necessary condition for ensuring the power quality, the voltage quality, the power grid loss and the safe and stable operation of the power system, and the method for ensuring the reactive power balance of the system is to perform reactive compensation on the power system to improve the power factor of the power supply system and the load, reduce the equipment capacity and the power loss, thereby improving the stability of the system and improving the power supply quality, the existing reactive compensation device mainly comprises a power semiconductor device, a switch switching fixed capacitor and a reactive generator, but the reactive compensation effect of the reactive compensation devices is not ideal, and the harmonic effect generated by a power electronic device can not be solved, thereby failing to ensure safe and reliable operation of the system.
The wiring of distribution network line is generally in outdoor open area, and the requirement to the cable sheath is higher, and the cable sheath on the market at present uses natural rubber and butylbenzene rubber more, and this kind of material elasticity is good, but weatherability is poor, and in the in-service use process, easy ageing fracture still can not satisfy the demand in some special places or the abominable place in environment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a 10KV power distribution network system which is used for solving the problems that the existing power distribution network cannot safely and reliably operate and cables in the existing power distribution network cannot be used in some special places.
In order to achieve the purpose, the invention provides the following technical scheme:
a 10KV power distribution grid system comprising: the 10KV power distribution system comprises a 10KV voltage distribution line, a transformer substation, a switch station, a distribution room and control protection equipment, wherein the 10KV voltage distribution line is connected through a distribution network rack, the distribution network rack comprises an overhead network rack and a cable network rack, the transformer substation is used for converting the transmission voltage of a power grid into the distribution voltage, the switch station is used for distributing the 10KV voltage distribution line, the distribution room is used for converting the 10KV voltage into the power consumption voltage, the control protection equipment is used for detecting the fault of the 10KV power distribution network system, the 10KV power distribution network system further comprises a reactive compensation device, the reactive compensation device comprises a passive reactive compensation module, an active reactive compensation module and a control module, the capacity of the active reactive compensation module is equal to the maximum capacity level difference between the passive public service compensation modules, and the passive reactive compensation module is connected into the power grid in parallel through a vertical busbar, the passive reactive compensation module comprises a plurality of reactive compensation units, each reactive compensation unit is connected with a power grid through a contactor, each reactive compensation unit comprises two thyristors which are reversely connected in parallel, one end of each thyristor is connected with the power grid after being connected in parallel, the other end of each thyristor is grounded through a first inductor and a first capacitor in sequence, the active reactive power compensation module adopts a static reactive power generator which is connected with the power grid through a second inductor, the control module comprises a reactive compensation control unit, a first optical coupling isolation unit, a second optical coupling isolation unit, a reactive generator control unit and a first controller, the output end of the first controller is connected with each reactive power compensation unit through a first optical coupling isolation unit and a reactive power compensation control unit in sequence, the output end of the first controller is also connected with the static var generator sequentially through the second optical coupling isolation unit and the reactive generator control unit.
Through the technical scheme, the passive reactive compensation and the active reactive compensation are combined to perform reactive compensation on the power grid, the advantages of the passive reactive compensation and the active reactive compensation are fully exerted to make up the respective defects, meanwhile, harmonic current contained in a load can be filtered, the reactive compensation effect of the power grid is improved, the electric energy quality of the power grid is improved, the safe and reliable operation of the power grid is ensured, and in the compensation capacity range, the residual reactive power is always smaller than the level difference of the passive reactive compensation module, so that the active reactive compensation module can make up the level difference of the passive reactive compensation module in the whole process, and the continuity of the output capacity of the compensation device is realized.
The invention is further configured to: the overhead network frame comprises a multi-section single-connection structure or a multi-section moderate-connection structure.
Through the technical scheme, the power supply reliability of the 10KV power distribution network system is improved.
The invention is further configured to: the cable net rack comprises a single-ring structure, a double-ring structure, a multi-branch multi-connection structure or an N supply-standby structure.
Through the technical scheme, the power supply reliability of the 10KV power distribution network system is improved.
The invention is further configured to: the control protection device comprises at least one of a circuit breaker, a relay protector, a voltage transformer and a current transformer.
Through the technical scheme, the power supply reliability of the 10KV power distribution network system is improved.
The invention is further configured to: the passive reactive compensation module is composed of a capacitor and reactance series circuit which adopts a solid state relay as a switching element, wherein the passive reactive compensation module is composed of a capacitor and a reactance series circuit and is connected with the solid state relay in series.
Through the technical scheme, the active reactive power compensation module can make up the level difference of the passive reactive power compensation module in the whole process, and the continuity of the output capacity of the compensation device is realized.
The invention is further configured to: the reactive power compensation device further comprises an overvoltage protection module, the overvoltage protection module comprises a detection unit, a processing unit and a protection unit which are connected in sequence, the detection unit comprises a three-phase power meter, the three-phase power meter is arranged on a bus of a load side, the processing unit comprises a comparator and a second controller, a first input end of the comparator is connected with an output end of the three-phase power meter, a second input end of the comparator inputs a threshold signal, an output end of the comparator is connected with the second controller, an output end of the second controller is connected with the protection unit, the protection unit comprises a compound switch, the compound switch is arranged between each contactor and the reactive power compensation unit, and an output end of the second controller is connected with the compound switch in a control mode.
Through the technical scheme, when the voltage of the load exceeds the set value, the overvoltage module cuts off the connection between the reactive power compensation device and the power grid, so that the phenomenon that the reactive power compensation unit is damaged when the system voltage is too large is effectively prevented, and the service life of the compensation device is prolonged.
The invention is further configured to: the adopted cable sheath is a corrosion-resistant insulating sheath which comprises, by weight, 7 parts of phthalic acid ester, 8 parts of polycarbonate, 9 parts of sodium stearate, 6 parts of a stabilizer, 9 parts of polypropylene, 9 parts of melamine, 8 parts of an antioxidant, 3 parts of triethylene diamine, 8 parts of paraffin oil, 6 parts of three-type polyvinyl chloride, 46 parts of nylon, 17 parts of chlorinated rubber, 19 parts of an inorganic flame retardant and 7 parts of asbestos.
Through the technical scheme, the cable sheath adopts the corrosion-resistant insulating sheath, has excellent flame retardant property and corrosion resistance, is not easy to be damaged by external factors, is not easy to ignite in short circuit, greatly improves the safety performance of the cable, and has the characteristics of wear resistance and high temperature resistance by using the nylon component, so that the insulating sheath can not crack in a low-temperature state.
The invention is further configured to: when the load density is 1000 and 5000KW/km, the overhead network frame is a multi-segment single-connection structure; when the load density is 5000 + 10000KW/km, the overhead network rack is a multi-segment moderate connection structure, and the cable network rack is of a single-ring structure, a multi-branch multi-connection structure and an N-standby structure; when load density is 10000 + 30000KW/km, the cable net rack is a dual-ring structure.
Through above-mentioned technical scheme, the structure service environment of difference overhead net rack and cable network rack that can be audio-visual to, overhead net rack adopts the proper degree of many segmentations to contact the reliability higher, and cable network rack adopts the double ring net reliability higher.
The invention is further configured to: when the overhead network rack is of a multi-section single-connection structure, the number of sections in the overhead network rack line is 3-5, the number of connections is 1, the power supply radius is less than or equal to 2 kilometers, the section switch and the connection switch are selected as load switches, and in a distribution automation planning area, the connection switch, the section switch of each line are provided with a remote sensing module, a remote signaling module and a remote control module.
Through the technical scheme, the reliability of the operation of the power grid can be improved through reasonable segmentation, and the switch node can realize the functions of remote sensing, remote signaling and remote control according to the remote sensing module, the remote signaling module and the remote control module.
The invention is further configured to: when the overhead network rack is of a multi-section moderate connection structure, the number of sections in the overhead network rack line is 3-5, the number of connections is 2-3, the power supply radius is less than or equal to 2 kilometers, a section switch and a connection switch select a load switch, and in the distribution automation planning area, the connection switch, the section switch of each line are provided with a remote sensing module, a remote signaling module and a remote control module.
Through the technical scheme, the reliability of the operation of the power grid can be improved through reasonable segmentation, and the switch node can realize the functions of remote sensing, remote signaling and remote control according to the remote sensing module, the remote signaling module and the remote control module.
In conclusion, the invention has the following beneficial effects:
(1) the passive reactive compensation and the active reactive compensation are combined to perform reactive compensation on the power grid, so that the advantages of the passive reactive compensation and the active reactive compensation are fully exerted to make up the respective defects, the reactive compensation effect of the power grid is improved, the electric energy quality of the power grid is improved, the safe and reliable operation of the power grid is ensured, and in the compensation capacity range, the residual reactive power is always smaller than the level difference of the passive reactive compensation module, so that the active reactive compensation module can make up the level difference of the passive reactive compensation module in the whole process, and the continuity of the output capacity of the compensation device is realized;
(2) by arranging the overvoltage protection module, when the voltage of the load exceeds a set value, the overvoltage module cuts off the connection between the reactive power compensation device and the power grid, so that the phenomenon that the reactive power compensation unit is damaged when the voltage of the system is too high is effectively prevented, and the service life of the compensation device is prolonged;
(3) through being corrosion-resistant insulating crust with the cable crust, possess good flame retardant property and corrosion resisting property, be difficult for receiving external factor to damage to difficult the firing during the short circuit, greatly increased the security performance of cable.
Drawings
FIG. 1 is a schematic diagram of the 10KV power distribution grid system of the present invention;
fig. 2 is a schematic diagram of the internal structure of the reactive power compensation device of the present invention;
fig. 3 is a functional block diagram of an overvoltage protection module of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Example 1
Please refer to fig. 1, which is a schematic structural diagram of a 10KV distribution network system of the present invention, as shown in the figure, the 10KV distribution network system may include a 10KV voltage distribution line, a transformer substation, a switch station, a distribution room, a control protection device, and a reactive power compensation device, where the 10KV voltage distribution line is electrically connected to the transformer substation, the switch station, and the control protection device, the transformer substation is electrically connected to the control protection device, the switch station is electrically connected to the control protection device and the distribution room, the distribution room is electrically connected to the control protection device, and the reactive power compensation device is electrically connected to the control protection device, and the structure of each component is described in further detail below.
The 10KV voltage distribution lines are connected through a distribution network rack, wherein, preferably, in this embodiment, the distribution network rack may include an overhead network rack and a cable network rack, the overhead network rack may be any one or more of structures such as a multi-segment single-connection structure and a multi-segment moderate-connection structure, and the cable network rack may be any one or more of structures such as a single-ring structure, a double-ring structure, a multi-branch multi-connection structure, and an N supply one backup structure, wherein, preferably, in this embodiment, when the overhead network rack includes a multi-segment single-connection structure, the overhead network rack is divided into three segments through a load switch, and two overhead lines from different substations are connected.
The transformer substation is used for converting power transmission voltage of a power grid into distribution voltage and outputting the distribution voltage through a 10KV voltage distribution line.
The switching station is used for distributing 10KV voltage distribution lines, wherein the 10KV voltage distribution lines distributed through the switching station are led into the distribution room.
The power distribution room is internally provided with a transformer and a 10KV switch cabinet and is used for converting 10KV voltage into power utilization voltage.
The control protection device is used for detecting a fault of a 10KV voltage distribution network system or protecting the 10KV distribution network system when the fault occurs, wherein preferably, in this embodiment, the control protection device may include at least one of a circuit breaker, a relay protector, a voltage transformer and a current transformer.
In addition, it should be noted that, in this embodiment, the distribution network rack structure refers to a distribution network connection structure that is fed out from a power point, is composed of elements such as lines, switches and distribution transformers according to a certain connection manner, has a mutual connection relationship, and is capable of distributing electric energy, and the load density is low load density between 1000 and 5000KW/km, the load density is medium load density between 5000 and 10000KW/km, and the load density is high load density between 10000 and 30000 KW/km.
Preferably, in the present embodiment, when the load density is 1000-; when the load density is 5000 + 10000KW/km, the overhead network rack is a multi-segment moderate connection structure, and the cable network rack is of a single-ring structure, a multi-branch multi-connection structure and an N-standby structure; when load density is 10000 + 30000KW/km, the cable net rack is a dual-ring structure.
The overhead distribution line in the low-load density area can adopt a multi-section single-connection wiring mode, the open-loop operation is carried out, the line is generally divided into 3 sections according to the property, the capacity, the number of users and the line length of the line load, the number of the sections can be properly increased when necessary, and necessary margins are reserved for the maximum load rate of the whole line and the sections so as to realize load transfer under fault or overhaul.
The preferred, when the cable network rack includes a plurality of single-ring structures, set up the tie between two sets of single-ring structures, distribution network rack wiring structure is two main one of three powers of single looped netowrk and is equipped with the mode of connection, and single looped netowrk rack structure contains two power stations, and the transformer is established ties between two power stations, and the tie switch is normally open tie switch, sets up on the transformer.
Preferably, when the overhead network frame comprises a multi-segment single-connection structure, the number of segments in the line of the overhead network frame is 3-5, the number of connections is 1, the power supply radius is less than or equal to 2 kilometers, the load switches are selected for the segment switches and the connection switches, in a distribution automation planning area, the connection switches, the segment switches of each line are provided with the remote sensing module, the remote signaling module and the remote control module, and specifically, the multi-segment single-connection structure is suitable for an area with a load density of 1000 plus 5000 KW/km.
Preferably, when the overhead network grid structure comprises a multi-section moderate connection structure, the overhead network line is divided into three sections through load switches, and each section of line is connected with another line from the same transformer substation or lines from other transformer substations; the line is generally divided into three sections by using column switches according to the load and capacity, each section of line is communicated with other lines of the transformer substation 1 or other transformer substation lines, the open-loop operation is realized, the section switch can be installed at the first section of the longer branch line, and further, in the actual use, the appropriate section configuration is automated to save investment.
The overhead distribution line of the medium load density region can adopt a multi-section multi-connection wiring mode and open-loop operation, so that the operation is flexible and the equipment investment benefit is brought into play, generally, three sections and three networks are good, each section is connected with other lines in one place and is connected with other same-station or different-station lines, the number of the sections can be properly increased when necessary, a section switch can be installed at the first section of the longer branch line, and the number of the sections and the connection of the lines can be properly increased for implementing the distribution automation line.
Preferably, when the overhead network frame comprises a multi-segment moderate connection structure, the number of segments in the overhead network frame line is 3 to 5, the number of connections is 2 to 3, the power supply radius is less than or equal to 2 kilometers, the sectionalizing switch and the connecting switch select load switches, in a distribution automation planning area, the connecting switch, the sectionalizing switch of each line configure a remote sensing module, a remote signaling module and a remote control module, and particularly, the multi-segment moderate connection structure is suitable for an area with a load density of 10000KW/km plus 5000.
In the city center and high load density area, in order to meet the power supply requirement of important loads, a double-ring network connection mode can be adopted, cable double-line lines can be built at the initial stage according to the important load requirement, investment scale and area economic development, transition to the double-ring network is carried out as necessary and feasible, the number of connected users is comprehensively determined according to factors such as load property, load capacity and power supply reliability requirement, and the maximum load rate of a line trunk line is controlled to be below 50% so as to realize load transfer under fault or overhaul.
Preferably, when cable network rack includes dual ring structure, dual ring structure's segmentation number can not exceed 6, and the contact number is 1, and power supply radius is less than or equal to 2 kilometers, section switch, contact switch select the looped netowrk cabinet for use, and in distribution automation planning region, contact switch configuration remote sensing module, remote signaling module and remote control module, specifically, dual ring structure is applicable to load density and is between 10000 and 30000 KW/km.
The N-supply backup structure mentioned in this embodiment means that N cable lines are used as power supply lines, and another line is used as a public backup line to form a cable ring network for operation, and the power supply lines can be operated in full load, and if a certain power supply line fails, the backup line can be switched to operate.
Among various grid structures, the reliability of multi-segment (moderate) connection in the overhead network is higher, the reliability of a double-ring network in the cable network is higher, the reliability of the grid structures in different load density areas is basically unchanged, but the reliability difference among the grid structures in the area with higher load density is smaller.
Referring to fig. 2, which is a schematic diagram of an internal structure of the reactive power compensation device of the present invention, as shown in the figure, the reactive power compensation device may include a passive reactive power compensation module, an active reactive power compensation module, and a control module, wherein a capacity of the active reactive power compensation module is equal to a maximum capacity difference between the passive reactive power compensation modules, the passive reactive power compensation module is connected in parallel to a power grid through a vertical bus bar via the control module and the active reactive power compensation module, and the passive reactive power compensation module and the active reactive power compensation module are configured to compensate for required reactive power according to an output signal of the control module. In addition, the structures and the working principles of the passive reactive compensation module and the active reactive compensation module are the prior art, and therefore, the details are not repeated herein.
The passive reactive compensation module can comprise a plurality of reactive compensation units, each reactive compensation unit is connected with a power grid through a contactor, each reactive compensation unit comprises two thyristors which are reversely connected in parallel, one end of each thyristor is connected with the power grid after being connected in parallel, the other end of each thyristor is grounded through a first inductor and a first capacitor in sequence, preferably, in the embodiment, the first inductor can adopt an adjustable inductor, the adjustable inductor comprises a coil and an iron core which is arranged in the coil and moves along the coil, one end of the iron core is fixedly connected with a rack, a gear is meshed on the rack and is connected with an output shaft of a motor, the motor is connected with the output end of the control module, the inductance value of the first inductor can be adjusted by adjusting the length of the iron core in the coil, so that the reactive compensation units avoid the main harmonic frequency of the power grid, and main harmonics of the power grid flow to the ground through the first inductor and, thus, the harmonic waves of the power grid are treated.
In this embodiment, the passive reactive compensation module is composed of a capacitor and reactance series circuit using a solid-state relay as a switching element, and the passive reactive compensation module is composed of a capacitor and a reactance series circuit and is connected in series with the solid-state relay.
The active reactive compensation module adopts a static var generator, the static var generator is connected with the power grid through a second inductor, wherein, the better, in this embodiment, the static var generator can adopt a voltage type three-phase full-bridge inverter, the three-phase output end of the three-phase full-bridge inverter is connected with the power grid through the second inductor respectively.
Control module can include reactive compensation control unit, first opto-coupler isolation unit, second opto-coupler isolation unit, reactive generator control unit and first controller, the output of first controller loops through first opto-coupler isolation unit and reactive compensation control unit and links to each other with each reactive compensation unit, the output of first controller still loops through second opto-coupler isolation unit and reactive generator control unit and links to each other with static reactive generator.
Example 2
Referring to fig. 3, which is a schematic block diagram of an overvoltage protection module of the present invention, as shown in the figure, the present embodiment is different from the previous embodiment in that the reactive power compensation device of the present invention may further include an overvoltage protection module, where the overvoltage protection module may include a detection unit, a processing unit, and a protection unit, which are connected in sequence, the detection unit employs a three-phase power meter, the three-phase power meter is disposed on a bus on a load side and is used to detect a voltage value, a current value, and a power value of the bus end, the processing unit employs a comparator and a second controller, a first input end of the comparator is connected to an output end of the three-phase power meter, a second input end of the comparator inputs a threshold signal, an output end of the comparator is connected to the second controller, an output end of the second controller is connected to the protection unit, and the protection unit employs a compound switch, the composite switch sets up between each contactor and reactive power compensation unit, composite switch is connected in the output control of second controller, the voltage value of detecting element real-time detection load side, the comparator compares this voltage value and threshold value signal, and when the voltage value of load side exceeded the threshold value, the disconnection of second controller control composite switch, with reactive power compensation unit and electric wire netting disconnection, prevent to cause the phenomenon that reactive power compensation unit damaged when system voltage is too big, improve reactive power compensation device's life.
When the load contains harmonic waves, the static var generator filters harmonic current contained in the load, and simultaneously adjusts the inductance value of a first inductor in the reactive compensation unit, so that the reactive compensation unit avoids the main harmonic frequency of the power grid, thereby governing the harmonic waves of the power grid and further improving the power quality of the power grid.
In addition, the wiring of the power distribution network line is generally in an outdoor open area, the requirement on the cable sheath is higher, the cable sheath on the market at present mostly uses natural rubber and styrene-butadiene rubber, the material has good elasticity but poor weather resistance, is easy to age and crack in the actual use process, and still cannot meet the requirements in some special places or places with severe environment.
Preferably, in this embodiment, the cable sheath is a corrosion-resistant insulating sheath, and the corrosion-resistant insulating sheath may include, by weight, 7 parts of phthalate, 8 parts of polycarbonate, 9 parts of sodium stearate, 6 parts of a stabilizer, 9 parts of polypropylene, 9 parts of melamine, 8 parts of an antioxidant, 3 parts of triethylene diamine, 8 parts of paraffin oil, 6 parts of polyvinyl chloride, 46 parts of nylon, 17 parts of chlorinated rubber, 19 parts of an inorganic flame retardant, and 7 parts of asbestos; the specific manufacturing process may be to stir and mix the above raw materials in parts by weight, and then perform a melting operation, preferably, the melting time may be 20 minutes to 40 minutes, specifically 35 minutes, and the melting temperature may be maintained at 200 degrees and 300 degrees, specifically 250 degrees, and finally cool to a normal temperature state to obtain the corrosion-resistant insulating sheath.
The raw materials of the corrosion-resistant insulating sheath mentioned in the embodiment are obtained after being formed by the plastic extruding machine, so that the corrosion-resistant insulating sheath has excellent flame retardant property and corrosion resistance, is not easy to be damaged by external factors, is not easy to ignite in short circuit, greatly increases the safety performance of the cable, uses the nylon component, enables the insulating sheath to have the characteristics of wear resistance and high temperature resistance, and cannot crack in a low-temperature state.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A 10KV power distribution grid system comprising: the 10KV power distribution system comprises 10KV voltage distribution lines, a transformer substation, a switch station, a distribution room and control protection equipment, wherein the 10KV voltage distribution lines are connected through a distribution network rack, the distribution network rack comprises an overhead network rack and a cable network rack, the transformer substation is used for converting the transmission voltage of a power grid into the distribution voltage, the switch station is used for distributing the 10KV voltage distribution lines, the distribution room is used for converting the 10KV voltage into the power consumption voltage, the control protection equipment is used for detecting the faults of the 10KV power distribution system,
the 10KV power distribution network system further comprises a reactive power compensation device, the reactive power compensation device comprises a passive reactive power compensation module, an active reactive power compensation module and a control module, wherein the capacity of the active reactive power compensation module is equal to the maximum capacity level difference between the passive reactive power compensation modules, the passive reactive power compensation module and the active reactive power compensation module are connected in parallel to a power grid through a vertical busbar through the control module, the passive reactive power compensation module comprises a plurality of reactive power compensation units, each reactive power compensation unit is connected with the power grid through a contactor, each reactive power compensation unit comprises two thyristors in inverse parallel connection, one end of each thyristor is connected with the power grid after being connected in parallel, the other end of each thyristor is grounded through a first inductor and a first capacitor, the active reactive power compensation module adopts a static reactive power generator, and the static reactive power generator is connected with the power grid through a second inductor, the control module includes reactive compensation control unit, first opto-coupler isolation unit, second opto-coupler isolation unit, reactive generator control unit and first controller, the output of first controller loops through first opto-coupler isolation unit and reactive compensation control unit and links to each other with each reactive compensation unit, the output of first controller still loops through second opto-coupler isolation unit and reactive generator control unit and links to each other with static reactive generator.
2. The 10KV power distribution network system of claim 1, wherein the overhead network rack comprises a multi-segment single-contact structure or a multi-segment medium-contact structure.
3. The 10KV power distribution network system of claim 2, wherein the cable grid comprises a single-loop configuration, a double-loop configuration, a multi-branch multi-connection configuration, or an N-supply-one-backup configuration.
4. The 10KV power distribution grid system of claim 3, wherein the control protection device comprises at least one of a circuit breaker, a relay protector, a voltage transformer, and a current transformer.
5. The 10KV power distribution network system of claim 1, wherein the passive reactive compensation module is composed of a capacitor and reactance series circuit using a solid state relay as a switching element, wherein the passive reactive compensation module is composed of a capacitor and reactance series circuit and is connected in series with a solid state relay.
6. The 10KV power distribution network system according to claim 1, wherein the reactive compensation device further comprises an overvoltage protection module, the overvoltage protection module comprises a detection unit, a processing unit and a protection unit which are connected in sequence, the detection unit comprises a three-phase power meter which is arranged on a bus on the load side, the processing unit comprises a comparator and a second controller, wherein a first input end of the comparator is connected with an output end of the three-phase power meter, a second input end of the comparator inputs a threshold signal, an output end of the comparator is connected with the second controller, the output end of the second controller is connected with a protection unit, the protection unit comprises a compound switch, the composite switches are arranged between the contactors and the reactive compensation units, and the output end of the second controller is connected with the composite switches in a control mode.
7. The 10KV power distribution network system of claim 1, wherein the cable sheath used is a corrosion-resistant insulating sheath comprising, by weight, 7 parts of phthalate, 8 parts of polycarbonate, 9 parts of sodium stearate, 6 parts of stabilizer, 9 parts of polypropylene, 9 parts of melamine, 8 parts of antioxidant, 3 parts of triethylene diamine, 8 parts of paraffin oil, 6 parts of tri-type polyvinyl chloride, 46 parts of nylon, 17 parts of chlorinated rubber, 19 parts of inorganic flame retardant, and 7 parts of asbestos.
8. The 10KV power distribution grid system of claim 3,
when the load density is 1000 and 5000KW/km, the overhead network frame is a multi-segment single-connection structure;
when the load density is 5000 + 10000KW/km, the overhead network rack is a multi-segment moderate connection structure, and the cable network rack is of a single-ring structure, a multi-branch multi-connection structure and an N-standby structure;
when load density is 10000 + 30000KW/km, the cable net rack is a dual-ring structure.
9. The 10KV power distribution network system according to claim 8, wherein when the overhead network rack is a multi-segment single-connection structure, the number of segments in the overhead network rack lines is 3 to 5, the number of connections is 1, the power supply radius is less than or equal to 2 kilometers, load switches are selected as the segment switches and the connection switches, and a remote sensing module, a remote signaling module and a remote control module are configured on the connection switches and the segment switches of each line in a distribution automation planning area.
10. The 10KV power distribution network system according to claim 9, wherein when the overhead network grid is a multi-segment moderate interconnection structure, the number of segments in the overhead network grid lines is 3 to 5, the interconnection number is 2 to 3, the power supply radius is less than or equal to 2 kilometers, load switches are selected as the segment switches and the interconnection switches, and a remote sensing module, a remote signaling module and a remote control module are configured for the interconnection switch, the segment switch and the interconnection switch of each line in the distribution automation planning area.
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| CN202010033512.3A CN113113917A (en) | 2020-01-13 | 2020-01-13 | 10KV power distribution network system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117767569A (en) * | 2023-12-27 | 2024-03-26 | 国网黑龙江省电力有限公司大庆供电公司 | Remote control system based on relay |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882883A (en) * | 2015-06-29 | 2015-09-02 | 国家电网公司 | 10 KV power distribution network system |
| CN108306307A (en) * | 2017-12-29 | 2018-07-20 | 河南北瑞电子科技有限公司 | A kind of reactive power compensator |
| CN108559180A (en) * | 2018-05-10 | 2018-09-21 | 徐州通用高新磁电有限公司 | A kind of corrosion-resistant plastic electric wire skin |
-
2020
- 2020-01-13 CN CN202010033512.3A patent/CN113113917A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882883A (en) * | 2015-06-29 | 2015-09-02 | 国家电网公司 | 10 KV power distribution network system |
| CN108306307A (en) * | 2017-12-29 | 2018-07-20 | 河南北瑞电子科技有限公司 | A kind of reactive power compensator |
| CN108559180A (en) * | 2018-05-10 | 2018-09-21 | 徐州通用高新磁电有限公司 | A kind of corrosion-resistant plastic electric wire skin |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117767569A (en) * | 2023-12-27 | 2024-03-26 | 国网黑龙江省电力有限公司大庆供电公司 | Remote control system based on relay |
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