CN103872702A - Main wiring structure of intelligent MG (microgrid) power distribution network - Google Patents
Main wiring structure of intelligent MG (microgrid) power distribution network Download PDFInfo
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Abstract
The invention discloses a main wiring structure of an intelligent MG (microgrid) power distribution network, which can optimally select the configuration of DG (distributed generation) and guarantee the safe and reliable running of an MG. The input end of a main wiring is connected with an extranet power source, the main wiring consists of a plurality of parallel main lines, the parallel main lines are connected by sectional circuit breakers, one main line consists of a plurality of groups of circuit breakers, a transformer and the MG, the circuit breakers are sequentially and serially connected, the MG comprises a plurality of micro-gas turbines, a 380V bus DGM, a double-power source transfer switch ATS and a test load D, and the 380V bus DGM passes through the double-power source transfer switch ATS and then is connected with the test load D. The structure has the advantages that according to the characteristics of the intelligent MG, the DG is furthest utilized, and the structure can be applied to the intelligent MG project consisting of a plurality of DGs, such as wind, solar energy, micro-gas turbines, diesel and stored energy.
Description
Technical field
The present invention relates to a kind of electric power system distribution technique, particularly relate to a kind of mode of connection of intelligent micro-grid power supply main electrical scheme.
Background technology
The kind of distributed power source (DG-Dispersed Generation) is a lot, comprises small power station, wind power generation, photo-voltaic power supply, miniature turbine, fuel cell, miniature gas turbine and energy storage device (as flywheel, ultracapacitor, the storage of superconduction magnetic energy and sodium sulfur storage battery etc.).In general, its capacity is from several kW to tens MW.DG in power distribution network, due near load center, has reduced the needs to electrical network expansion, and has improved power supply reliability, is therefore widely adopted.Particularly contribute to alleviate the distribution type renewable energy of greenhouse effect, under the support energetically in many national government policies, increase rapidly.
At present; a large amount of distributed power sources also moves on the net in middle pressure or low-voltage distribution; thoroughly change the feature of traditional unidirectional trend of distribution system, required system service-strong power supply main electrical scheme and new protection scheme, voltage control and instrument to meet the needs of bi-directional current.
Summary of the invention
Based on this, be necessary for prior art problem, a kind of intelligent micro-grid distribution network main electrical scheme structure is provided, proposed a kind of power supply main electrical scheme optimization method of the flexible operation for intelligent micro-grid, optimize the configuration of choosing distributed power source, ensure the safe and reliable operation of micro-electrical network.
For solving prior art problem, the present invention by the following technical solutions:
A kind of intelligent micro-grid distribution network main electrical scheme structure, the input of main electrical scheme is connected with outer network source, main electrical scheme is made up of some parallel main lines, between parallel main line, connected by section breaker, wherein a main line is made up of the circuit breaker, transformer and the micro-electrical network MG that organize series connection successively more; Micro-electrical network MG comprises some miniature combustion engines, 380V bus DGM, double power supply converting switch ATS, test load D; Outer network source is by two main lines road access network, outer network source is divided into external electrical network B1 and external electrical network B2, external electrical network B1 is through this main line of 10kV bus M2, transformer T2 access 380V bus LM2, external electrical network B2 is through another main line of 10kV bus M1, transformer T1 access 380V bus LM1, between 10kV bus M1 and 10kV bus M2, be connected by section breaker 600, between 380V bus LM1 and 380V bus LM2, be connected by section breaker 4000,380V bus LM1 connects the 380V bus DGM of micro-electrical network MG; In micro-electrical network MG, some miniature combustion engine access 380V bus DGM, described 380V bus DGM is by joint test load D after double power supply converting switch ATS, and described 380V bus LM1 is joint test load D after double power supply converting switch ATS.
In certain embodiments, described micro-electrical network MG comprises 3 miniature combustion engines, on-load switch, isolating switch, circuit breaker and 380V bus DGM, double power supply converting switch ATS, test load D, 3 miniature combustion engines are miniature combustion engine A1, miniature combustion engine A2, miniature combustion engine A3, miniature combustion engine A1, miniature combustion engine A2, miniature combustion engine A3 passes through on-load switch successively, after isolating switch, access 380V bus DGM, 380V bus DGM is by circuit breaker 4518, joint test load D after double power supply converting switch ATS, 380V bus LM1 is through circuit breaker 4111, joint test load D after double power supply converting switch ATS, 380V bus LM1 connects 380V bus DGM through circuit breaker 4101.
In certain embodiments, described 380V bus DGM is by the rear connection combustion of circuit breaker 4519 machine load NL.
In certain embodiments, described miniature combustion engine A1 is successively by on-load switch 4611, the rear access of isolating switch 4541 380V bus DGM, miniature combustion engine A2 is successively by on-load switch 4612, the rear access of isolating switch 4542 380V bus DGM, and miniature combustion engine A3 is successively by on-load switch 4613, the rear access of isolating switch 4543 380V bus DGM.
In certain embodiments, described outer network source is outside 10kV power distribution network, 35kV power distribution network, medium-voltage distribution station or power plant, outside 10kV power distribution network is divided into external electrical network B1 and external electrical network B2, external electrical network B1 accesses this main line of 10kV bus M2 through circuit breaker 603, and external electrical network B2 accesses another main line of 10kV bus M1 through circuit breaker 602; 10kV bus M1 is successively by circuit breaker 801, transformer T1, the rear access of circuit breaker 4021 380V bus LM1.
In certain embodiments, described 10kV bus M1 is successively by powering to synthetic load NT after circuit breaker 601, transformer T3; 380V bus LM1 is by the rear connection of circuit breaker 302 C2 that generally loads.
In certain embodiments, described 10kV bus M2 is successively by circuit breaker 802, transformer T2, the rear access of circuit breaker 4131 380V bus LM2, and 380V bus LM2 is by the rear connection of circuit breaker 301 C1 that generally loads.
In certain embodiments, described distributed power source DG is miniature gas turbine, interior miniature combustion engine, fuel cell, solar cell, wind-driven generator or biomass energy.
In certain embodiments, described section breaker disconnects in the time that electrical network normally moves, selectivity closure when electrical network breaks down.
The present invention is directed to the feature of intelligent micro-grid, consider the resource randomness in the project planning phase, according to the resource situation of project location and part throttle characteristics, maximum using DG power supply, makes investment and the running cost optimum of intelligent micro-grid in Life cycle.The method the present invention relates to, can be widely applied to the intelligent micro-grid project being formed by multiple distributed power sources such as wind, light, miniature combustion engine, bavin, storages, especially in intelligent micro-grid project, optimize the micro-electrical network main electrical scheme configuration of various distributed power supply smarts for determining in the time that project construction is planned.
Brief description of the drawings
Fig. 1 is the main wiring circuit figure of the embodiment of the present invention.
Embodiment
For further understanding feature of the present invention, technological means and the specific purposes that reach, function, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Micro-electrical network MG is a kind of by load and distributed power source DG(micro power) system that forms, it can provide electric energy and heat simultaneously, can be incorporated into the power networks and lonely network operation.Shown in accompanying drawing 1, in testing site, improve utilance and the economy of distributed combined cooling and power system, the capacity of co-feeding system only partly meets maximum electric loading and the refrigeration duty demand of testing site.Except combustion machine load NL(flue gas lithium bromide refrigerator), in the synthetic load NT of testing site, general load, test load D, be equipped with electric air-conditioning system, jointly meet the refrigeration duty demand in region, testing site.Testing site is connected with electrical network, when miniature combustion engine electrical power is not enough to meet testing site electrical load requirement, is supplemented by external power grid power supply.
The input of main line is connected with outside 10kV power distribution network, outside 10kV power distribution network enters by two main lines road, outside 10kV power distribution network is divided into external electrical network B1 and external electrical network B2, external electrical network B1 accesses this main line of 10kV bus M2 through circuit breaker 603, external electrical network B2 accesses another main line of 10kV bus M1 through circuit breaker 602, (accessing respectively 10kV bus M1, M2 through circuit breaker 602,603), is connected by section breaker 600 between the 10kV bus M1 of two sections of 10kV buses and 10kV bus M2.
10kV bus M1 is successively by powering to synthetic load NT after circuit breaker 601, transformer T3.
10kV bus M1 is successively by circuit breaker 801, transformer T1, the rear access of circuit breaker 4021 380V bus LM1, and 380V bus LM1 is by the rear connection of circuit breaker 302 C2 that generally loads, and the C2 that generally loads is powered by 380V bus LM1.10kV bus M2 is successively by circuit breaker 802, transformer T2, the rear access of circuit breaker 4131 380V bus LM2, and 380V bus LM2 is by the rear connection of circuit breaker 301 C1 that generally loads, and the C1 that generally loads is powered by 380V bus LM2.(two sections of 10kV buses access respectively two sections of 380V bus LM1, LM2 by two transformer T1, T2), is connected by section breaker 4000 between 380V bus LM1 and 380V bus LM2.
380V bus LM1 connects 380V bus DGM through circuit breaker 4101, described section breaker 600, section breaker 4000 disconnect in the time that electrical network normally moves, these two sections of buses of 380V bus LM1 and 380V bus LM2 independent operating separately, when electrical network breaks down, circuit breaker, section breaker carry out selectivity switching.
Distributed power source DG comprises 3 miniature combustion engine (miniature combustion engine A1, miniature combustion engine A2, miniature combustion engine A3), 3 miniature combustion engines pass through on-load switch successively, after isolating switch, access 380V bus DGM, miniature combustion engine A1 is successively by on-load switch 4611, the rear access of isolating switch 4541 380V bus DGM, miniature combustion engine A2 is successively by on-load switch 4612, the rear access of isolating switch 4542 380V bus DGM, miniature combustion engine A3 is successively by on-load switch 4613, the rear access of isolating switch 4543 380V bus DGM, 380V bus DGM is by the rear connection combustion of circuit breaker 4519 machine load NL, 380V bus DGM is by the rear joint test load of circuit breaker 4518 D, 380V bus LM1 is joint test load D after circuit breaker 4111, test load D is through double power supply converting switch ATS connecting breaker 4518 and circuit breaker 4111 respectively.
On-load switch, for cut-offfing and close the load current of distributed power source DG, has live road with manual mode break-make.Isolating switch makes 380V bus DGM or test load D and distributed power source DG isolation, forms obvious fracture and isolates with live part, in order to ensure attendant's personal safety in the time of 380V bus DGM and test load D maintenance.
380V bus DGM is connected with 380V bus LM1 by circuit breaker 4101.General load C1, generally the C2 that loads is powered by 380V bus LM2,380V bus LM1 respectively, combustion machine load NL is powered by 380V bus DGM, test load D respectively connects a power supply by circuit breaker 4111 and circuit breaker 4518 respectively by 380V bus LM1 and 380V bus DGM, powers through double power supply converting switch ATS.Synthetic load NT is powered by 10kV bus M1 after 10kV circuit breaker 601, transformer T3.
When normal, section breaker 600, section breaker 4000 disconnect, these two sections of buses of 10kV bus M1,10kV bus M2 independent operating separately, in the time of arbitrary incoming power (external electrical network B1, external electrical network B2) dead electricity or transformer fault, can continue as load power supply by the switching of lead-in circuit breaker and section breaker.Miniature combustion engine (miniature combustion engine A1, miniature combustion engine A2, miniature combustion engine A3) at ordinary times with electrical network paired running, its Capacity Selection and 380V bus LM1 and 380V bus DGM meet test load D and match; For ensureing distributed power source DG economical operation, distributed power source DG capacity is generally less than the load of 380V bus LM1; Can stable operation when making lonely net, miniature combustion engine total capacity is greater than the load of 380V bus DGM and test load D again.In the time that external electrical network breaks down, the relay protection device that can install by miniature combustion engine or circuit breaker 4,101 two places detect, cut-off breaker 4101 after protection action, and miniature combustion engine continues as test load D power supply, and it is reliable that proof load is powered.After external electrical network is recovered normally, miniature combustion engine is incorporated into the power networks again.
Main task of the present invention is to build distributed energy station, for newly-built general load and original synthetic load and test load power supply, is general load and synthetic load cooling, to realize the comprehensive utilization of the energy simultaneously.Intelligent micro-grid power supply main electrical scheme is most important for fail safe, reliability, the economy of micro-operation of power networks, the present invention is directed to the power supply main electrical scheme optimization method of the flexible operation of intelligent micro-grid, and tool has the following advantages:
1) design of this intelligent micro-grid power supply main electrical scheme, can ensure the safety of power consumption equipment in region, ensures the reliable of load power supply.In the time that electrical network breaks down, intelligent micro-grid can be as early as possible departs from electrical network, and in intelligent micro-grid, the fault of various device can be isolated as early as possible, DG(distributed power source) continuity that can guarantee test load customer power supply, after power system restoration is normal, intelligent micro-grid can be again grid-connected as early as possible.The relaying protection of micro-electrical network inside and the configuration of automatics also will be taking safe and reliable as prerequisite, taken into full account that the access of DG is on the impact of external electrical network simultaneously.Be integrated in electrical network to come and coordinated operation seamless these distributed power sources by senior automated system, can bring huge benefit.Except saving the investment of power transmission network, it can improve system-wide reliability and efficiency, and urgent power and on-peak power support to electrical network are provided, and some other assistant service function, as reactive power support, quality of power supply improvement etc.;
2) simultaneously, it is also for system operation provides huge flexibility.As under storm and ice and snow weather, in the time that large electrical network is seriously damaged, these distributed power sources can form lonely net voluntarily, and guarantee test load user provides emergency service.The intelligent micro-grid main electrical scheme of this patent design can be realized the switching of various operational modes, the flexible and convenient operation of the regular maintenance of equipment etc.
3) taken into full account that the access of DG is on the impact of external electrical network.Consider the access point of DG, distributed power generation power in region, testing site and power load are carried out to balance, the electric weight that can make user priority use micro-electrical network inside to send of this patent distribution structure, take into account the demand of cold (heat) load simultaneously, improve the using energy source benefit of DG, saved user cost.DG not only can save conventional energy resource, can also improve energy resource structure, reduce environmental pollution, can bring direct economic benefit, social benefit and environmental benefit.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (7)
1. an intelligent micro-grid distribution network main electrical scheme structure, the input of main electrical scheme is connected with outer network source, it is characterized in that, described main electrical scheme is made up of some parallel main lines, between described parallel main line, connected by section breaker, wherein a main line is made up of the circuit breaker, transformer and the micro-electrical network MG that organize series connection successively more; Described micro-electrical network MG comprises some miniature combustion engines, 380V bus DGM, double power supply converting switch ATS, test load D;
Outer network source is by two main lines road access network, outer network source is divided into external electrical network B1 and external electrical network B2, external electrical network B1 is through this main line of 10kV bus M2, transformer T2 access 380V bus LM2, external electrical network B2 is through another main line of 10kV bus M1, transformer T1 access 380V bus LM1, between described 10kV bus M1 and 10kV bus M2, be connected by section breaker 600, between described 380V bus LM1 and 380V bus LM2, be connected by section breaker 4000, described 380V bus LM1 connects the 380V bus DGM of micro-electrical network MG;
In described micro-electrical network MG, some miniature combustion engine access 380V bus DGM, described 380V bus DGM is by joint test load D after double power supply converting switch ATS, and described 380V bus LM1 is joint test load D after double power supply converting switch ATS.
2. a kind of intelligent micro-grid distribution network main electrical scheme structure according to claim 1, it is characterized in that, described micro-electrical network MG comprises 3 miniature combustion engines, on-load switch, isolating switch, circuit breaker and 380V bus DGM, double power supply converting switch ATS, test load D, 3 miniature combustion engines are miniature combustion engine A1, miniature combustion engine A2, miniature combustion engine A3, described miniature combustion engine A1, miniature combustion engine A2, miniature combustion engine A3 passes through on-load switch successively, after isolating switch, access 380V bus DGM, described 380V bus DGM is by circuit breaker 4518, joint test load D after double power supply converting switch ATS, described 380V bus LM1 is through circuit breaker 4111, joint test load D after double power supply converting switch ATS, described 380V bus LM1 connects 380V bus DGM through circuit breaker 4101.
3. a kind of intelligent micro-grid distribution network main electrical scheme structure according to claim 2, is characterized in that, described 380V bus DGM is by the rear connection combustion of circuit breaker 4519 machine load NL.
4. a kind of intelligent micro-grid distribution network main electrical scheme structure according to claim 2, it is characterized in that, described miniature combustion engine A1 is successively by on-load switch 4611, the rear access of isolating switch 4541 380V bus DGM, described miniature combustion engine A2 is successively by on-load switch 4612, the rear access of isolating switch 4542 380V bus DGM, and described miniature combustion engine A3 is successively by on-load switch 4613, the rear access of isolating switch 4543 380V bus DGM.
5. a kind of intelligent micro-grid distribution network main electrical scheme structure according to claim 1, it is characterized in that, described outer network source is outside 10kV power distribution network, 35kV power distribution network, medium-voltage distribution station or power plant, described outside 10kV power distribution network is divided into external electrical network B1 and external electrical network B2, described external electrical network B1 accesses this main line of 10kV bus M2 through circuit breaker 603, and described external electrical network B2 accesses another main line of 10kV bus M1 through circuit breaker 602; Described 10kV bus M1 is successively by circuit breaker 801, transformer T1, the rear access of circuit breaker 4021 380V bus LM1.
6. a kind of intelligent micro-grid distribution network main electrical scheme structure according to claim 5, is characterized in that, described 10kV bus M1 is successively by powering to synthetic load NT after circuit breaker 601, transformer T3; Described 380V bus LM1 is by the rear connection of circuit breaker 302 C2 that generally loads.
7. a kind of intelligent micro-grid distribution network main electrical scheme structure according to claim 5, it is characterized in that, described 10kV bus M2 is successively by circuit breaker 802, transformer T2, the rear access of circuit breaker 4131 380V bus LM2, and described 380V bus LM2 is by the rear connection of circuit breaker 301 C1 that generally loads.
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| CN104065064A (en) * | 2014-07-14 | 2014-09-24 | 国网上海市电力公司 | Control method for a 110 kilovolt transformer substation micro-grid |
| CN105634022A (en) * | 2016-02-02 | 2016-06-01 | 黄钰雪 | Resource comprehensive utilization method for hydraulic power plant by adding biomass power generation apparatus |
| CN106877384A (en) * | 2015-12-14 | 2017-06-20 | 沙洋弘润建材有限公司 | For the electric power system of floatation glass production line |
| CN107612031A (en) * | 2017-09-30 | 2018-01-19 | 安徽海螺建材设计研究院 | Cogeneration grid-connected system |
| CN108616114A (en) * | 2018-05-16 | 2018-10-02 | 国网山东省电力公司电力科学研究院 | A kind of power distribution network distributed layer protection system and method for the group containing microgrid |
| US11283263B2 (en) | 2015-12-11 | 2022-03-22 | Hitachi Energy Switzerland Ag | Microgrid segmentation |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CN104065064A (en) * | 2014-07-14 | 2014-09-24 | 国网上海市电力公司 | Control method for a 110 kilovolt transformer substation micro-grid |
| US11283263B2 (en) | 2015-12-11 | 2022-03-22 | Hitachi Energy Switzerland Ag | Microgrid segmentation |
| CN106877384A (en) * | 2015-12-14 | 2017-06-20 | 沙洋弘润建材有限公司 | For the electric power system of floatation glass production line |
| CN105634022A (en) * | 2016-02-02 | 2016-06-01 | 黄钰雪 | Resource comprehensive utilization method for hydraulic power plant by adding biomass power generation apparatus |
| CN105634022B (en) * | 2016-02-02 | 2018-08-24 | 黄钰雪 | Power station increases the Resource comprehensive utilization method of biomass generator |
| CN107612031A (en) * | 2017-09-30 | 2018-01-19 | 安徽海螺建材设计研究院 | Cogeneration grid-connected system |
| CN107612031B (en) * | 2017-09-30 | 2024-01-23 | 安徽海螺建材设计研究院 | Waste heat power generation grid-connected system |
| CN108616114A (en) * | 2018-05-16 | 2018-10-02 | 国网山东省电力公司电力科学研究院 | A kind of power distribution network distributed layer protection system and method for the group containing microgrid |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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Address after: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant after: Company limited of China Energy Engineering Group Guangdong Electric Power Design Institute Address before: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant before: Guangdong Electric Power Design Institute of CEEC |
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Free format text: CORRECT: APPLICANT; FROM: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE TO: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE CO., LTD. |
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