CN107294088B - Incremental power distribution network construction application method for electric power change and multi-power direct power supply system - Google Patents
Incremental power distribution network construction application method for electric power change and multi-power direct power supply system Download PDFInfo
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- CN107294088B CN107294088B CN201710507139.9A CN201710507139A CN107294088B CN 107294088 B CN107294088 B CN 107294088B CN 201710507139 A CN201710507139 A CN 201710507139A CN 107294088 B CN107294088 B CN 107294088B
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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Abstract
An application method for quickly constructing an industrial park incremental power distribution network suitable for electric modification comprises the following steps: the power generation and power utilization enterprises in the same industrial park form an electricity selling company, and the incremental power distribution network is invested and operated; quickly constructing an incremental power distribution network by means of a large-scale thermal power plant, wherein the incremental power distribution network consists of a high-voltage power transmission network, a high-voltage power distribution network and a medium-voltage power distribution network; the method comprises the steps of building a junction substation by using a booster station of a thermal power plant on the same site, directly outputting 110 kilovolt lines from a bus on the middle voltage side of the junction substation to supply power to a public substation and a special substation of a user in an industrial park, and adopting a double-loop power supply mode; a plurality of 10 kilovolt feeder lines are arranged on a public transformer station in a 110 kilovolt industrial park for radiation power supply, and a plurality of 10 kilovolt feeder lines are laid on the same tower; an access point is provided for a new energy power station, and a multi-power direct power supply system composed of power sources such as thermal power, wind power and the like is formed. And a high-voltage class transformer substation and a high-voltage transmission line are not required to be newly built in different places, so that the power supply capacity and the power supply reliability are ensured, and a line corridor is saved.
Description
Technical Field
The invention relates to the technical field of electric power system marketing reform and electric company increment distribution network, in particular to a rapid construction and application method of an industrial park increment distribution network applicable to electric power reform (electric power reform is short for electric power system reform).
Background
In 3 months of 2015, the central national institute of China (issue [2015] 9) opens a large screen of new power system reform, relates to reform tasks such as power transmission and distribution price, power transaction mechanism, power generation plan, power distribution side and the like, and aims to solve the outstanding problem of restricting the scientific development of the power industry.
In the year 2016, 10 months, the national institute of improvement and delivery of power distribution network business management method (the body of improvement of delivery of the national energy bureau [2016] 2120) provides an incremental power distribution network which encourages orderly investment and operation of social capital, the business scope comprises the investment construction and operation of the incremental power distribution network which meets the requirements of power distribution and planning, the capacity expansion and the extension of the power distribution network are invested in a mixed mode, and the power distribution network is mainly defined to be a 110 kilovolt and lower voltage level power grid, a 220 (330) kilovolt and lower voltage level industrial park (economic development area) and other local power grids.
Currently, hundreds of electricity-selling companies are established in 31 provinces (municipal and autonomous areas) of the country, but the construction mode of the incremental power distribution network is just explored, and many specific policies and technical problems are still needed to be solved: on one hand, the contradiction between the excessively high cost of electricity charge of an electricity enterprise in an industrial park and the insufficient power generation plan index of a power generation enterprise is prominent, and the high electricity price becomes an important factor for restricting the economic development; on the other hand, compared with a national power grid with huge scale and mature technology, the foundation for planning and constructing the incremental power distribution network of the electricity selling company is zero, and the technical problems of the connection mode with the external high-voltage power transmission network, the internal structure of the power distribution network and the like need to be continuously searched and innovated.
Therefore, research on an industrial park increment distribution network suitable for electric improvement and a multi-power direct-supply system of an electricity selling company based on a large-scale thermal power plant has important significance in improving a propulsion electric system, improving the operation efficiency of the distribution network, reducing the power consumption cost of enterprises and promoting the in-situ consumption of new energy.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a rapid construction and application method of an industrial park incremental power distribution network suitable for electric modification; the invention aims to solve the technical problem of providing an incremental power distribution network and a multi-power direct power supply system based on a large-scale thermal power plant.
The technical scheme adopted for solving the first technical problem is as follows: the utility model provides an industrial park increment distribution network quick construction application method suitable for electricity changes, its characterized in that improved technical scheme includes:
(1) Incremental power distribution network voltage class setting: the connection voltage class with the high-voltage transmission network is 220 kilovolts or more, the voltage class of the high-voltage distribution network is 110 kilovolts, and the voltage class of the medium-voltage distribution network is 10 kilovolts; the existing double-loop back line of the large-scale thermal power plant is used as a connecting line for connecting the high-voltage transmission network and the external incremental power distribution network, the power exchange task between the high-voltage transmission network and the external incremental power distribution network is born, and the operation safety of the incremental power distribution network is ensured.
(2) The construction and application method of the incremental power distribution network is characterized in that a large thermal power plant is used as a main power source, power is supplied to power loads in the industrial park range in a radiation mode through a newly built hub transformer substation, and construction elements comprise the large thermal power plant, the hub transformer substation, the industrial park public transformer substation, a power supply circuit and a user transformer substation.
(2.1) the junction substation for supplying power and the booster station of the thermal power plant are built on the same site, the junction substation is built back to back in a close range by utilizing the existing booster station of the thermal power plant on the same site, and the built junction substation is provided with two step-down transformers for supplying power for the high-voltage distribution network.
(2.2) carrying out two-time depressurization through a hub transformer substation and an industrial park public transformer substation to construct a 110 kilovolt high-voltage distribution network and a 10 kilovolt medium-voltage distribution network; 110 kilovolt lines are directly output from a bus at the middle voltage side of the hub substation to supply power to a public substation and a special substation for users in an industrial park, and a double-loop power supply mode is adopted; a plurality of 10 kilovolt feeder lines are arranged on a public transformer station in a 110 kilovolt industrial park for radiation power supply, and a plurality of 10 kilovolt feeder lines are laid on the same tower; forming a radial power supply system.
And (2.3) providing access points for wind power, photoelectricity and photo-thermal new energy power stations by using a hub transformer station and an industrial park public transformer station to form a multi-power direct power supply system consisting of thermal power, wind power, photoelectricity and photo-thermal energy sources, so that the new energy can be consumed in situ.
The technical scheme adopted by the invention for solving the second technical problem is as follows: incremental distribution network and multi-power supply direct power supply system based on large-scale thermal power plant, including high-voltage transmission network and thermal power plant's two circuit that send out, its characterized in that: the system also comprises a high-voltage distribution network and a medium-voltage distribution network; the high-voltage power transmission network is connected with the high-voltage power distribution network through a double-loop-back line of the thermal power plant, and the high-voltage power distribution network is connected with the medium-voltage power distribution network.
The high-voltage distribution network comprises a booster station of a thermal power plant, a hub transformer substation, a user-specific transformer substation, a park public transformer substation, a photo-thermal power station, a wind power plant and a photovoltaic power station; the high-voltage power transmission network transformer substation of the high-voltage power transmission network is connected with the booster station of the thermal power plant through a double-return-transmission line of the thermal power plant; the thermal power plant booster station is connected with the hub transformer substation back to back, the hub transformer substation is connected with a plurality of user-specific transformer substations through a power supply line, the hub transformer substation is connected with a park public transformer substation through a power supply line, the photo-thermal power station and the wind farm are connected with the hub transformer substation, and the photovoltaic power station is connected with the park public transformer substation; the medium-voltage distribution network comprises a plurality of back-distribution power feeder lines which are respectively connected with the public substation of the park.
Aiming at the construction problem of an industrial park incremental power distribution network of an electricity-selling company, the invention provides a set of complete industrial park incremental power distribution network rapid construction application method and a novel technology of a multi-power direct power supply system of the electricity-selling company based on a large-scale thermal power plant.
The innovation points and the technical effects of the invention are detailed as follows:
(1) The power generation enterprises and the power utilization enterprises which reside in the same industrial park jointly fund to form the power selling company, the industrial park incremental power distribution network is built and operated in investment, the power supply range is the industrial park incremental power utilization load, the power generation, power selling and power utilization integration is realized, the improvement of the transmission and distribution price is facilitated, the operation efficiency of the power distribution network is improved, and the investment risk of the power selling company is reduced; through market guidance and reasonable electricity price negotiation mechanism, two targets of improving a power generation plan and reducing electricity consumption cost are simultaneously realized, and the problems of insufficient power generation plan index of a power generation enterprise and huge enterprise electricity consumption cost are solved, so that win-win of the power generation enterprise and the power consumption enterprise is realized.
(2) The incremental power distribution network is communicated with an external high-voltage power transmission network through the existing double-loop transmission line of the large-scale thermal power plant, bears the power exchange task between the two, and the thermal power operates according to the principles of preferential self-use and surplus internet surfing, so that the power generation plan is improved, and the high-voltage power transmission network supplements power when the thermal power overhauls or breaks down, so that the power supply capacity of the industrial park power distribution network can be ensured; and ensure system voltage and system frequency and ensure the operation safety of the distribution network, and also play a role in maintenance reserve or accident guarantee, and the electricity selling company pays the safety guarantee cost to the high-voltage transmission network.
(3) The method relies on the large-scale thermal power plant to quickly construct the incremental distribution network, and the large-scale thermal power plant, the hub transformer substation, the power supply line and the user transformer substation in the industrial park correspondingly represent the power generation, transformation, distribution and power utilization processes and functions of the power system; the connection voltage class with the high-voltage transmission network is 220 kilovolts or more, the voltage class of the high-voltage distribution network is 110 kilovolts, and the voltage class of the medium-voltage distribution network is 10 kilovolts.
(4) The hub transformer station for power supply and the booster station of the thermal power plant are built on the same site, and the existing booster station of the thermal power plant is utilized for 'back-to-back' building the hub transformer station, and the specific scheme is that two step-down transformers are built, the step-up transformer and the step-down transformer share a high-voltage side bus of the booster station of the thermal power plant, the medium-voltage side bus of the hub transformer station is used as a power supply of a power distribution network, and the low-voltage side bus is used for installing reactive compensation equipment; according to the technical scheme, a transformer station with a high voltage level and a high-voltage transmission line are not required to be newly built in different places, so that the method meets the spirit of electricity modification, saves investment of an electricity selling company to the greatest extent, and reduces the difficulty of operation of a power distribution network;
(5) The hub transformer substation and the park public transformer substation are subjected to two-time depressurization, a 110 kilovolt high-voltage distribution network and a 10 kilovolt medium-voltage distribution network are constructed, a radial power supply network is formed, and the wiring of the power network is simple and clear; the double-loop power supply mode is adopted, so that the power supply capacity and the power supply reliability are ensured, and a line corridor can be saved by adopting the same-tower multi-loop laying mode;
(6) The hub transformer substation and the park public transformer substation provide access points for the new energy power station to form a multi-power direct power supply system composed of power supplies such as thermal power, wind power, photoelectricity, photo-thermal power and the like, so that the space resources of a public power grid are saved, and the coordination and sustainable development of the power grid are facilitated; the distribution network of the electricity selling company has independent and autonomous scheduling authority, and the peak regulation capacity is provided for new energy actively by the coordination control of the electricity load and the power generation load in the network and the thermal power, so that the new energy power can be received to the maximum extent, the problems of new energy electricity nest and wind discarding and light discarding can be effectively solved, and the on-site consumption of the new energy is further realized.
Drawings
FIG. 1 is a schematic diagram of an incremental power distribution network and a multi-power direct-supply system based on a large-scale thermal power plant;
fig. 2 is a schematic diagram of an electrical structure of a booster station and a junction substation of a thermal power plant.
In the figure: 1-high voltage transmission network, 2-high voltage distribution network, 3-medium voltage distribution network, 4-high voltage transmission network transformer substation, 5-high voltage transmission network line, 6-thermal power plant double-return transmission line, 7-thermal power plant booster station, 8-hub substation, 9-power supply line, 10-user special substation, 11-park public substation, 12-distribution feeder line, 13-photo-thermal power station, 14-wind farm, 15-photovoltaic power station, 16-thermal power plant booster station high-voltage side bus bar, 17-thermal power plant booster station booster transformer, 18-thermal power plant generator set, 19-hub substation booster transformer, 20-hub substation medium-voltage side bus bar, 21-hub substation low-voltage side bus bar, 22-hub substation reactive compensation equipment.
Detailed Description
A system embodiment; as shown in fig. 1: an incremental power distribution network and multi-power direct power supply system based on a large-scale thermal power plant comprises a high-voltage power transmission network 1 and a dual-loop-back line 6 of the thermal power plant, wherein the high-voltage power transmission network 1 comprises a high-voltage power transmission network transformer substation 4, and the high-voltage power transmission network transformer substation 4 is connected with a high-voltage power transmission network line 5; the method is characterized in that: the system also comprises a high-voltage distribution network 2 and a medium-voltage distribution network 3; the high-voltage transmission network 1 is connected with the high-voltage distribution network 2 through a double-loop-back line 6 of the thermal power plant, and the high-voltage distribution network 2 is connected with the medium-voltage distribution network 3.
The high-voltage distribution network 2 comprises a thermal power plant booster station 7, a hub transformer substation 8, a user-specific transformer substation 10, a park public transformer substation 11, a photo-thermal power station 13, a wind power plant 14 and a photovoltaic power station 15; the high-voltage power transmission network transformer substation 4 is connected with a booster station 7 of the thermal power plant through a double loop-back line 6 of the thermal power plant; the thermal power plant booster station 7 and the junction substation 8 are arranged in a back-to-back connection mode, namely in practical application, the junction substation is directly built in a close range at the same site of the existing thermal power plant booster station, a high-voltage class substation and a high-voltage transmission line are not required to be newly built in different places, investment of an electricity selling company is saved to the greatest extent, and operation difficulty of a power distribution network is reduced; the hub transformer substation 8 is connected with a plurality of user-specific transformer substations 10 through a power supply line 9, the hub transformer substation 8 is connected with a park public transformer substation 11 through the power supply line 9, the photo-thermal power station 13 and the wind power station 14 are connected with the hub transformer substation 8, and the photovoltaic power station 15 is connected with the park public transformer substation 11; the medium voltage distribution network 3 comprises a plurality of distribution feeders 12 (three loops are shown in fig. 1), and the distribution feeders 12 are respectively connected with a park public substation 11.
In this way, the high-voltage distribution network 2 supplies power to the user-specific substation 10 and the park public substation 11 through the hub substation 8, and the medium-voltage distribution network 3 supplies power in a radiation manner through the distribution feeder line 12 of the park public substation 11; the photo-thermal power station 13 and the wind farm 14 are connected to the hub substation 8, and the photovoltaic power station 15 is connected to the park public substation 11. The hub transformer station and the park public transformer station provide access points for new energy power stations to form a multi-power direct power supply system composed of power supplies such as thermal power, wind power, photoelectricity, photo-thermal power and the like; the distribution network of the electricity selling company has independent and autonomous scheduling authority, and through coordination control of the electricity load and the power generation load in the network, the thermal power actively provides peak regulation capacity for the new energy power station, can furthest receive the new energy power, relieves the problems of new energy nest electricity and wind abandon and light abandon, and realizes the on-site consumption of the new energy.
See fig. 2: the thermal power plant booster 7 comprises a thermal power plant booster high-voltage side bus 16, a thermal power plant booster transformer 17 and a thermal power plant generator set 18, wherein the thermal power plant generator set 18 is connected with the thermal power plant booster transformer 17, and the thermal power plant booster transformer 17 is connected with the thermal power plant booster high-voltage side bus 16; the extended hub transformer substation 8 comprises two hub transformer substation step-down transformers 19, a hub transformer substation medium-voltage side bus 20, two hub transformer substation low-voltage side bus 21 and two hub transformer substation reactive compensation devices 22; the high-voltage sides of the two junction substation step-down transformers 19 are respectively connected to the high-voltage side bus 16 of the step-up station of the thermal power plant, the medium-voltage sides of the two junction substation step-down transformers 19 are respectively connected to the medium-voltage side bus 20 of the junction substation, the low-voltage side of the junction substation step-down transformer 19 is connected to the low-voltage side bus 21 of the junction substation, and the reactive compensation equipment 22 is installed on the low-voltage side bus 21 of the junction substation.
The core technical content of the system is mainly that a hub transformer substation for supplying power to a power distribution network of a park is built back to back by utilizing a booster station of a thermal power plant, and the booster transformer and a power supply step-down transformer of the thermal power plant share a high-voltage side bus of the booster station of the thermal power plant; the medium-voltage distribution network takes an industrial park hub transformer substation as a center, adopts a radial mode to supply power to public and user transformer substations in the industrial park, and supplies power to the medium-voltage distribution network in the industrial park in a radial mode through the public transformer substation; the park hub transformer substation and the public transformer substation provide access points for new energy sources such as wind power, photoelectricity and photo-thermal, and a multi-power direct power supply system is formed. The industrial park incremental distribution network consists of three parts, namely a high-voltage distribution network (110 kilovolts) and a medium-voltage distribution network (10 kilovolts), which are connected with a high-voltage transmission network (220 kilovolts or more).
Method embodiments; an application method for quickly constructing an industrial park incremental power distribution network suitable for electric modification is as follows:
1. see fig. 1: the high-voltage distribution network is invested and built by the electricity generation enterprises and a plurality of electricity utilization enterprises, so that the hub transformer substation, the power supply line and the public transformer substation of the industrial park are built by the electricity generation enterprises, and the special transformer substation for users is invested and built by the electricity utilization enterprises.
2. The voltage level of the industrial park incremental power distribution network consists of three parts, the connection voltage level with the high-voltage power transmission network is 220 kilovolts or more, the voltage level of the high-voltage power distribution network is 110 kilovolts, and the voltage level of the medium-voltage power distribution network is 10 kilovolts; the existing double-loop back line of the large-scale thermal power plant is used as a connecting line for connecting the high-voltage transmission network and the external incremental power distribution network, and the tasks of power exchange and safe operation guarantee between the high-voltage transmission network and the external incremental power distribution network are undertaken.
2.1, the junction substation for supplying power and the booster station of the thermal power plant are built on the same site, the junction substation is built by utilizing the close-range expansion of the existing booster station of the thermal power plant, and the built junction substation is provided with two step-down transformers for supplying power for the high-voltage distribution network.
2.2, carrying out two-time depressurization through a hub transformer substation and an industrial park public transformer substation to construct a 110 kilovolt high-voltage distribution network and a 10 kilovolt medium-voltage distribution network; 110 kilovolt lines are directly output from a bus at the middle voltage side of the hub substation to supply power to a public substation and a special substation for users in an industrial park, and a double-loop power supply mode is adopted; a plurality of 10 kilovolt feeder lines are arranged on a public transformer station in a 110 kilovolt industrial park for radiation power supply, and a plurality of 10 kilovolt feeder lines are laid on the same tower; forming a radial power supply system.
And 2.3, the hub transformer substation and the public transformer substation in the industrial park provide access points for wind power, photoelectricity and photo-thermal new energy power stations to form a multi-power direct power supply system consisting of thermal power, wind power, photoelectricity and photo-thermal energy sources, so that the new energy can be consumed in situ.
Conventionally, a thermal power plant is used as a power supply terminal, and the power supply task is never carried out only by sending out the network through the power plant.
Claims (2)
1. The utility model provides an industrial park increment distribution network quick construction application method suitable for electricity changes, its characterized in that improved technical scheme includes:
(1) Incremental power distribution network voltage class setting: the connection voltage class with the high-voltage transmission network is 220 kilovolts or more, the voltage class of the high-voltage distribution network is 110 kilovolts, and the voltage class of the medium-voltage distribution network is 10 kilovolts; the existing double-loop back line of the large-scale thermal power plant is used as a connecting line for connecting the high-voltage transmission network and the external incremental power distribution network, so that the power exchange task between the high-voltage transmission network and the external incremental power distribution network is born, and the operation safety of the incremental power distribution network is ensured;
(2) The construction application method of the incremental power distribution network is characterized in that a large thermal power plant is used as a main power source, power is supplied to power loads in the industrial park range in a radiation mode through a newly built hub transformer substation, and construction elements comprise the large thermal power plant, the hub transformer substation, an industrial park public transformer substation, a power supply line and a user transformer substation;
(2.1) establishing a junction substation for supplying power and a booster station of a thermal power plant at the same site, and setting the junction substation by utilizing the close-range expansion of the existing booster station of the thermal power plant at the same site, wherein the expanded junction substation is provided with two step-down transformers for supplying power for a high-voltage distribution network;
(2.2) carrying out two-time depressurization through a hub transformer substation and an industrial park public transformer substation to construct a 110 kilovolt high-voltage distribution network and a 10 kilovolt medium-voltage distribution network; 110 kilovolt lines are directly output from a bus at the middle voltage side of the hub substation to supply power to a public substation and a special substation for users in an industrial park, and a double-loop power supply mode is adopted; a plurality of 10 kilovolt feeder lines are arranged on a public transformer station in a 110 kilovolt industrial park for radiation power supply, and a plurality of 10 kilovolt feeder lines are laid on the same tower; forming a radial power supply system;
and (2.3) providing access points for wind power, photoelectricity and photo-thermal new energy power stations by using a hub transformer station and an industrial park public transformer station to form a multi-power direct power supply system consisting of thermal power, wind power, photoelectricity and photo-thermal energy sources, so that the new energy can be consumed in situ.
2. Incremental distribution network and multi-power supply direct power supply system based on large-scale thermal power plant, including high-voltage transmission network and thermal power plant's two circuit that send out, its characterized in that: the system also comprises a high-voltage distribution network (2) and a medium-voltage distribution network (3); the high-voltage distribution network (2) comprises a thermal power plant booster station (7), a hub transformer substation (8), a user special transformer substation (10), a park public transformer substation (11), a photo-thermal power station (13), a wind power plant (14) and a photovoltaic power station (15); the thermal power plant booster station (7) is connected with the hub transformer station (8) at the same site, the hub transformer station (8) is connected with a plurality of user special transformer stations (10) through a power supply circuit (9), the hub transformer station (8) is connected with a park public transformer station (11) through the power supply circuit (9), the photo-thermal power station (13) and the wind farm (14) are connected with the hub transformer station (8), and the photovoltaic power station (15) is connected with the park public transformer station (11); the medium-voltage distribution network (3) comprises a plurality of return distribution feeder lines (12), and the plurality of return distribution feeder lines (12) are respectively connected with a park public transformer substation (11);
the connection voltage class with the high-voltage transmission network is 220 kilovolts or more, the voltage class of the high-voltage distribution network (2) is 110 kilovolts, and the voltage class of the medium-voltage distribution network (3) is 10 kilovolts.
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