CN104993517A - High-reliability power distribution network system having new energy power source - Google Patents

High-reliability power distribution network system having new energy power source Download PDF

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Publication number
CN104993517A
CN104993517A CN201510452617.1A CN201510452617A CN104993517A CN 104993517 A CN104993517 A CN 104993517A CN 201510452617 A CN201510452617 A CN 201510452617A CN 104993517 A CN104993517 A CN 104993517A
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main feeder
feeder
main
feeder line
load branch
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CN104993517B (en
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周鹏
金蓉英
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention discloses a high-reliability power distribution network system having a new energy power source. The system comprises a main feeder connected with a main power source. A plurality of main feeder load branch circuits are arranged on the main feeder in a parallel-connection way. Isolation switches are arranged between adjacent main feeder load branch circuits. The system further comprises a secondary feed line. A plurality of secondary feed line load branch circuits are arranged on the secondary feed line in a parallel-connection way. Isolation switches are arranged between adjacent secondary feed line load branch circuits. The head end of the secondary feed line is connected with an interconnection switch on the main feeder through a breaker to the main feeder to form a secondary feed line isolation region. The tail end of the secondary feed line isolation region is connected with the output end of a wind light storage combined system. The head end of the main feeder is provided with a breaker. A head end main feeder isolation region is formed on the main feeder load branch circuits between the breaker and an interconnection switch nearest to the breaker. Other main feeder load branch circuits located between two adjacent interconnection switches form a plurality of main feeder isolation regions. The tail end feed line of each main feeder isolation region is connected with the output end of the wind light storage combined system. The system reliability can be improved. Relatively great economic and environmental benefits can be achieved. The system has a good application prospect.

Description

A kind of high reliability distribution network system containing new forms of energy power supply
Technical field
The present invention relates to the system layout field of new forms of energy plant-grid connection power distribution network, be specifically related to a kind of high reliability distribution network system containing new forms of energy power supply.
Background technology
China while industrialization and rapid economic development, consume by fossil energy the greenhouse gas emission that causes and problem of environmental pollution more remarkable.The CO2 emissions in especially flourishing city, many areas constantly increases on the one hand, and air pollution is on the rise.On the other hand, the fast development in city makes its demand for energy constantly increase, and wherein the demand of electric energy is wherein very important one.In power system reform, improving as reducing electricity shortage of electric network composition, improves electric network reliability and has played key effect.
Still based on traditional coal generating, there is more problem: coal resources are exhausted, thermal power generation produces a large amount of atmosphere pollutions in the electric network composition of current China; Large-scale hydropower station concentrates on west area, electric power difficulty of transportation; In the generation of electricity by new energy stage at the startup, using energy source amount is less; Densely populated urban electricity supply is nervous, and short of electricity amount is large; Remote districts power grid construction imperfection, cannot power.
For the problems referred to above, current existing solution has following four:
One is build extensive generation of electricity by new energy power plant; Generation of electricity by new energy is defined as the strength by means of new technology and new science and technology, selects renewable resource (as wind energy, solar energy, biomass energy, geothermal energy etc.) as generating raw material, obtains clean green electric power energy by power conversion; Be characterized in renewable, clean environment firendly.But build on a large scale, cost of investment is high, require high to the amount to obtain of natural resources.
Two is development distributed new power supplys; Distributed new power supply is defined as the new forms of energy power supply of 35KV and the following electric pressure be not directly connected with concentrated transmission system; Be characterized in that installed capacity is little, convenient flexibly, near user, gather materials on the spot, consume on the spot.Non-firm power demand that is remote or densely inhabited district can be met, save power transmission and distribution investment, peak-clipping and valley-filling.But its small scale, the intermittence of new forms of energy and randomness feature cause its instability of exerting oneself, and affect electric network reliability.
Three is access large-scale energy storage device; Energy storage device based on storage battery, with new forms of energy power supply with the use of, can the instability of level and smooth new forms of energy power supply exert oneself, to improve power supply reliability.Large-scale energy storage device cost is very high, and utilance is lower.
Four is upgrading grid equipments, development intelligent grid; Intelligent grid is defined as full automation, intelligentized electric power transmission network, grid nodes is controlled, the information in guarantee power plant to terminal use's power transmission and distribution process between all nodes and the two-way flow of electric energy based on communication network, information technology, control technology etc.Be characterized in the information integerated of height, stronger electrical network self-healing ability, power grid visualization manages.But it is very high to the requirement of technology maturity and the level of economic development.
Summary of the invention
In order to solve the deficiencies in the prior art, the object of this invention is to provide a kind of place in circuit optimizing access infrastructure, rationally system layout, fast the new forms of energy plant-grid connection power distribution network of response fault, can system reliability be improved and realize good economic and environmental benefit.
The present invention adopts following technical scheme:
Containing a high reliability distribution network system for new forms of energy power supply, comprise the main feeder be connected with main power source, multiple feeder lines; Described main feeder is parallel with multiple main feeder load branch, between adjacent main feeder line load branch, is provided with isolating switch; Described feeder line is parallel with multiple feeder line load branch, isolating switch is provided with between adjacent feeder line load branch, the head end of secondary feeder line is connected on main feeder by the interconnection switch of the correspondence on circuit breaker and main feeder and forms time feeder line isolated area, and the tail end feeder line of secondary feeder line isolated area is connected with the output of the wind-solar-storage joint system for providing power supply; The head end of described main feeder is provided with circuit breaker, this circuit breaker and and the interconnection switch nearest from it between main feeder load branch form the main feeder isolated area of head end, on main feeder, other main feeder load branch between adjacent two interconnection switches form multiple main feeder isolated area, and the tail end feeder line of each main feeder isolated area is connected with the output of wind-solar-storage joint system.
Further, each load branch on described main feeder and time feeder line includes power load, and power load is connected on main feeder or secondary feeder line by the fuse of contacting and transformer.
Further, described circuit breaker is primary cut-out.
Further, described wind-solar-storage joint system comprises controller, the output of controller is connected with the control end of Wind turbines, solar array and storage battery respectively, described controller is also connected with inverter, and the output of inverter is connected with the tail end feeder line of each main feeder isolated area and time feeder line isolated area respectively.
Further, described controller is FACTS controller.
Beneficial effect of the present invention:
(1) the present invention is by distributed wind-solar-storage joint system access electrical network, is formed the system configuration of high reliability by access infrastructure and rational layout.Wind-solar-storage joint system is by wind-driven generator, solar panel and Combined storage battery, the optimization system of collaborative power supply, this system gives full play to the generating advantage of new forms of energy no pollution, high flexibility ratio, energy storage device is combined with new forms of energy power supply and reduces the intermittent feature of generation of electricity by new energy, ensure the stability of exerting oneself of powering, best on-position and rational system layout improve system reliability on the basis not increasing Financial cost.
(2) electric network reliability optimization is made.First by the tail end of each isolated island of wind-solar-storage joint system access, the load point by fault effects can be made necessarily to have the possibility being resumed power supply, make the robustness of fault occurrence positions stronger, guarantee that as far as possible many load point can be resumed power supply when fault occurs, the short of electricity time of minimizing system, thus improve system reliability.Secondly in the peak times of power consumption of peak times of power consumption in summer or every day, wind-solar-storage joint system can increase power supply according to load point demand, and alleviate peak electricity, supply falls short of demand to prevent electricity, the situation of system cut-off.The present invention makes electric network reliability optimization by the design of access infrastructure.
(3) utilization of new energy resources is maximized.Design of the present invention, by extensive power station blocking, is divided into multiple small-scale power supply, new forms of energy is accessed on the spot, consumes on the spot, especially promotes remote districts and densely populated urban area utilization of new energy resources.
(4) failure response is changed the soonest.Multiple wind-solar-storage joint system access point is set, for each isolated island accesses a wind-solar-storage joint system.On the one hand, when system element breaks down, in the fastest time, make response, for influenced load point continues power supply, without the need to waiting for fault restoration.On the other hand, the wind-solar-storage joint system access point of setting is more, and new forms of energy power supply is shorter to the distance of load point, can make response in beeline to Demand-side, is Demand-side continued power.
(5) environmental benefit is maximized.Traditional energy generating can produce the atmosphere pollutions such as a large amount of carbon dioxide, sulfur dioxide, dust, and the maximum feature of generation of electricity by new energy is clean green, can not pollute environment.The present invention can make utilization of new energy resources maximize, and then substitutes traditional energy generating to the full extent, reduces the discharge of atmosphere pollution, realizes the maximization of environmental benefit.
(6) popularization of family utilization of new energy resources is promoted.The present invention design new forms of energy plant-grid connection structure can make system reliability optimization, utilization of new energy resources maximize, along with generation technology, information technology, control technology constantly perfect, the access of family new forms of energy power supply has a extensive future.By new forms of energy plant-grid connection point familyization, ensure that the electric energy self-supporting of each family is self-sustaining, for the development for electrical stability and electric power system of self plays maximum social benefit.
(7) the present invention is to power distribution network zoning, for a wind-solar-storage joint system (RG) is accessed in each region; Two is that distribution network reliability at tail end, farthest must can be improved in the on-position of wind-solar-storage joint system (RG).So the innovation in general in distribution net work structure and layout.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of an embodiment of the present invention;
Fig. 2 is the wind-solar-storage joint system of an embodiment of the present invention is the schematic diagram that load point is powered.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The high reliability distribution network system containing new forms of energy power supply of a kind of embodiment of the present invention, comprises the main feeder be connected with main power source, multiple feeder lines; Described main feeder is parallel with multiple main feeder load branch, between adjacent main feeder line load branch, is provided with isolating switch; Described feeder line is parallel with multiple feeder line load branch, isolating switch is provided with between adjacent feeder line load branch, the head end of secondary feeder line is connected on main feeder by the interconnection switch of the correspondence on circuit breaker and main feeder and forms time feeder line isolated area, and the tail end feeder line of secondary feeder line isolated area is connected with the output of the wind-solar-storage joint system for providing power supply; The head end of described main feeder is provided with circuit breaker, this circuit breaker and and the interconnection switch nearest from it between main feeder load branch form head end main feeder isolated area, on main feeder, other main feeder load branch between adjacent two interconnection switches form multiple main feeder isolated area, and the tail end feeder line of each main feeder isolated area is connected with the output of wind-solar-storage joint system.The output of wind-solar-storage joint system is connected with the tail end of main feeder isolated area and time feeder line isolated area, the load point by fault effects can be made necessarily to have the possibility being resumed power supply, make the robustness of fault occurrence positions stronger, guarantee that as far as possible many load point can be resumed power supply when fault occurs, the short of electricity time of minimizing system, thus improve system reliability.
Each load branch on main feeder in the present invention and time feeder line includes power load, and power load is connected on main feeder or secondary feeder line by the fuse of contacting and transformer.
Circuit breaker described in the present invention is primary cut-out, is the most complicated most important device for switching in high voltage switchgear, can cuts off normal duty electric current, but can go out short-circuit current rapidly again, carry the dual role of control and protection simultaneously.Circuit breaker can after fixing a breakdown, and automatic reclosing operates, and recovers normal in time and run.
The system of wind-solar-storage joint described in the present invention comprises controller, controller in the present invention is FACTS controller, namely based on the controller of flexible AC transmission technology, its effect is transient stability, dynamic stability, voltage stabilization, suppress sub-synchronous oscillation, the suppression of voltage fluctuation and flickering, power flowcontrol is the critical elements of the conveying capacity improving power transmission network direction of tide control ability and improve transmission line; The output of controller is connected with the control end of Wind turbines, solar array and storage battery respectively, and described controller is also connected with inverter, and the output of inverter is connected with the tail end feeder line of each main feeder isolated area and time feeder line isolated area respectively.Wind-solar-storage joint system is by Wind turbines, solar array and Combined storage battery, and the optimization system of collaborative power supply, Wind turbines and solar array, be wind-force-solar energy complementary operation system, and combine with energy storage device, the electric energy of stable output.Wind turbines in the present invention and solar array scale less, natural resources can be obtained on the spot, access distribution system on the spot, easy for installation.As shown in Figure 2, Wind turbines and solar array form generation of electricity by new energy power supply jointly, and storage battery associated wind group of motors, solar array use, exerting oneself of level and smooth wind light generation.Wind turbines, solar array and storage battery are all connected to FACTS controller, and FACTS controller controls flexibly to the input voltage of electric energy, electric current, power and resistance etc., improves the stability of existing transmission line.FACTS controller is connected to inverter and the direct current that generation of electricity by new energy produces is converted to alternating current, is connected to the tail end feeder line of each main feeder isolated area and time feeder line isolated area, for powering for the power load in Fig. 2, for user provides reliable electric energy.Meanwhile, system also for power load is powered, realizes wind-solar-storage joint system and original system is incorporated into the power networks by main feeder, provides electric energy simultaneously, effectively guarantee that user can not power-off to user.In the present invention, the mode of operation of storage battery is: the complementary output power of false wind group of motors and solar array is P dG, the demand power of power load is P lif, P dG>P l, then charge in batteries, by unnecessary electrical power storage; If P dG<P l, then battery discharging, exports electric energy jointly with Wind turbines and solar array, meets the electricity needs of power load.In the present invention, breaker control and protection system electric current, circuit breaker is connected with fuse, when system power exceedes setting, the Melt molten open circuit of fuse; The output of fuse is connected with transformer, the conversion of transformer energy control voltage, electric current, resistance etc., by stable system power supply power load.When system jam, also by disconnecting the interconnection switch on main feeder, reduce the coverage to downstream power load.
One embodiment of the present of invention, are specially:
The main feeder adopted in the present embodiment is primal system is IEEE-RBTS Bus 6 main feeder F4, comprises 23 load circuit LP1-LP23,21 isolating switch K1-K21,23 fuses, 23 transformer T1-T23,4 circuit breaker Q F1-QF4; Wind-solar-storage joint system (RG) comprises 5 output RG01-RG05.
As shown in fig. 1, circuit breaker Q F1, interconnection switch C1 and be arranged on 7 load circuit LP1-LP7 therebetween and form the first main feeder isolated area (isolated island 1) of head ends; Interconnection switch C1, interconnection switch C2 and be arranged on 3 load circuit LP8-LP10 therebetween and form the second main feeder isolated area (isolated island 2); Circuit breaker Q F2, interconnection switch C1,5 the load branch LP11-LP15 be connected in parallel on the secondary feeder line that is connected with circuit breaker Q F2 form first time feeder line isolated area (isolated island 3); Circuit breaker Q F3, interconnection switch C2,3 the load branch LP16-LP18 be connected in parallel on the secondary feeder line that is connected with circuit breaker Q F3 form second time feeder line isolated area (isolated island 4); Circuit breaker Q F4, interconnection switch C2,5 the load branch LP19-LP23 be connected in parallel on the secondary feeder line that is connected with circuit breaker Q F4 form third time feeder line isolated area (isolated island 5), wind-solar-storage joint system comprises 5 output RG01-RG05 and is connected with the tail end feeder line of isolated island 1, isolated island 2, isolated island 3, isolated island 4, isolated island 5 respectively, be each isolated island and access a RG power supply, thus realize to power for the load point as much as possible in the isolated island of place, and when electric energy allows, close on island with power for what have an electrical energy demands.
System failure type is divided into feeder line, transformer and new forms of energy power failure, if certain element failure in system, all load point be affected are found according to the position of fault element, determine the load point that can not be resumed power supply by BFS method, and to be restored electricity by main feeder respectively and by the load point of wind-solar-storage joint system resumes power.All isolated islands after this fault element carry out islet operation by wind-solar-storage joint system resumes power.Main feeder place as being connected with load circuit LP5 in Fig. 1 breaks down, LP1-LP4 totally 4 load circuits is still restored electricity by main feeder, but system cannot be powered and to be powered to LP5-LP7, RG01 can respond fast, for LP5-LP7 provides power supply signal to restore electricity, isolated island 2, isolated island 3, isolated island 4, isolated island 5 carry out islet operation respectively, and restored electricity by RG02, RG03, RG04, RG05 respectively, realize wind-solar-storage joint system and original system is incorporated into the power networks, there is provided electric energy to user simultaneously, effectively guarantee that user can not power-off; Under identical fault, if RG01 connects the main feeder place be connected with load circuit LP4 in FIG, then RG01 can only be that LP1-LP4 continues power supply, cannot power to LP5-LP7, the most remarkable to the power supply function of isolated island when therefore each output of wind-solar-storage joint system accesses the tail end of each isolated island.This system layout feature is: on a small scale, multi-access point, and wind-solar-storage joint system scale is little, requires less, and install convenient to construct to the amount to obtain of natural resources; Multiple access point at utmost can shorten transmission distance, responds fast, is that affected load point continues power supply, without the need to waiting for fault restoration in the shortest time.
More than show and describe general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof.

Claims (5)

1., containing a high reliability distribution network system for new forms of energy power supply, it is characterized in that: comprise the main feeder be connected with main power source, multiple feeder lines; Described main feeder is parallel with multiple main feeder load branch, between adjacent main feeder line load branch, is provided with isolating switch; Described feeder line is parallel with multiple feeder line load branch, isolating switch is provided with between adjacent feeder line load branch, the head end of secondary feeder line is connected on main feeder by the interconnection switch of the correspondence on circuit breaker and main feeder and forms time feeder line isolated area, and the tail end feeder line of secondary feeder line isolated area is connected with the output of the wind-solar-storage joint system for providing power supply; The head end of described main feeder is provided with circuit breaker, this circuit breaker and and the interconnection switch nearest from it between main feeder load branch form the main feeder isolated area of head end, on main feeder, other main feeder load branch between adjacent two interconnection switches form multiple main feeder isolated area, and the tail end feeder line of each main feeder isolated area is connected with the output of wind-solar-storage joint system.
2. a kind of high reliability distribution network system containing new forms of energy power supply according to claim 1, it is characterized in that: each load branch on described main feeder and time feeder line includes power load, power load is connected on main feeder or secondary feeder line by the fuse of contacting and transformer.
3. a kind of high reliability distribution network system containing new forms of energy power supply according to claim 1, is characterized in that: described circuit breaker is primary cut-out.
4. a kind of high reliability distribution network system containing new forms of energy power supply according to claim 1, it is characterized in that: described wind-solar-storage joint system comprises controller, the output of controller is connected with the control end of Wind turbines, solar array and storage battery respectively, described controller is also connected with inverter, and the output of inverter is connected with the tail end feeder line of each main feeder isolated area and time feeder line isolated area respectively.
5. a kind of high reliability distribution network system containing new forms of energy power supply according to claim 4, is characterized in that: described controller is FACTS controller.
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CN103914788A (en) * 2014-03-04 2014-07-09 广东电网公司电力科学研究院 Reliability assessment method for power grid multi-link system
CN104167734A (en) * 2014-08-29 2014-11-26 重庆大学 Method for evaluating reliability of grid-connected microgrid based on timing simulation
CN104218604A (en) * 2014-08-19 2014-12-17 上海交通大学 Network equivalent method based power distribution network reliability analysis method and system
JP2015039247A (en) * 2009-10-27 2015-02-26 阿部 力也 Multi-terminal power conversion/distribution device, electrical equipment, distribution network system and method of operating the same
CN104504524A (en) * 2014-12-25 2015-04-08 国家电网公司 Reliability assessment method and load curtailing method applied to active distribution network
CN204947609U (en) * 2015-07-29 2016-01-06 南京航空航天大学 A kind of high reliability distribution network system containing new forms of energy power supply

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015039247A (en) * 2009-10-27 2015-02-26 阿部 力也 Multi-terminal power conversion/distribution device, electrical equipment, distribution network system and method of operating the same
CN203617954U (en) * 2013-11-13 2014-05-28 天津世冠自动化科技有限公司 Novel wind and light storage combination power generation system
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