CN202602306U - Grid-connected offline micro-grid system - Google Patents
Grid-connected offline micro-grid system Download PDFInfo
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- CN202602306U CN202602306U CN2012202481680U CN201220248168U CN202602306U CN 202602306 U CN202602306 U CN 202602306U CN 2012202481680 U CN2012202481680 U CN 2012202481680U CN 201220248168 U CN201220248168 U CN 201220248168U CN 202602306 U CN202602306 U CN 202602306U
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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
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- Y02P80/00—Climate change mitigation technologies for sector-wide applications
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- Y02P80/14—District level solutions, i.e. local energy networks
Abstract
The utility model discloses a grid-connected offline micro-grid system which comprises a distributed power generation system, a distributed energy storage system, a user load and a micro-grid central controller, wherein the distributed power generation system and the distributed energy storage system are connected with a low-voltage alternating current bus through respective energy conversion equipment, and the low-voltage alternating current bus is connected with a high-voltage alternating current bus through a boosting transformer; the user load is connected with the high-voltage alternating current bus through the boosting transformer in a grouping mode; the high-voltage alternating current bus is connected to a public power grid through a common connecting point; a static switch is arranged at the common connecting point; and the micro-grid central controller is in communication connection with the distributed power generation system, the distributed energy storage system and the static switch through cables. Due to the structure and active energy management of the micro-grid central controller, new energy power generation is completely for self-sufficiency, the power is not reversely supplied to the public power grid, and the public power grid cannot be impacted; and meanwhile, under the support of the public power grid, the user load obtains high power supply reliability and electric energy quality.
Description
Technical field
The utility model relates to the integrated application of microgrid, microgrid energy management and control technology field, particularly, relates to a kind of microgrid system that do not surf the Net that is incorporated into the power networks.
Background technology
In recent years; Continuous development raising along with the generation of electricity by new energy technology; The generating permeability of intermittent energy source such as wind energy and solar energy also constantly increases thereupon; But because the relative public electric wire net of distributed power source is uncontrollable generator unit, therefore big system often reduces its impact to public electric wire net through the mode of restriction and isolation.
In order to weaken impact and the negative effect of distributed power generation to public electric wire net, optimize and combine distributed generation system through the microgrid integrated technology, can well solve present large-scale distributed electricity generation grid-connecting difficult problem.
In general, the microgrid system have with outside public electric wire net be incorporated into the power networks with two kinds of operational modes of lonely network operation.Under the mode of being incorporated into the power networks, microgrid is through interconnection and outside public electric wire net paired running, and according to the supply/demand of microgrid internal electric source and load, the trend on the interconnection can two-way flow; Under lonely network operation mode, microgrid and outside public electric wire net break off and form isolated island, the load power supply of the inner little source of microgrid in microgrid, thus guarantee that its power supply reliability and power supply are continuous.
In fact, for the economy and the stable operation that guarantee the microgrid system, distributed energy need adopt the mode that is incorporated into the power networks with outside public electric wire net usually." being incorporated into the power networks " is meant distributed energy resource system under normal operating condition, exists on major loop with utility network to be electrically connected.Be electrically connected comprise cable directly connect, through transformer connect, through modes such as inverter connections.Distributed energy resource system is incorporated into the power networks and can be divided into " be incorporated into the power networks and do not surf the Net " and " be incorporated into the power networks and surf the Net " two kinds according to the Power Exchange mode." be incorporated into the power networks and do not surf the Net " under the mode, then distributed energy only is incorporated into the power networks with public electric wire net, and the direction of interconnection flow of power can only be to flow to the distributed energy resource system user from utility network; " be incorporated into the power networks and surf the Net " under the mode, distributed energy resource system not only can be incorporated into the power networks with public electric wire net, can also carry unnecessary electric weight to utility network simultaneously.
Yet; Distributed energy generates electricity by way of merging two or more grid systems and does not have the friendly type characteristic of electrical network; If directly the feed-in electrical network can cause certain impact, the particularly quality of power supply, power supply reliability and the relaying protection to power distribution network all can produce bigger influence to the safe and stable operation of electrical network.
To the above policy and the state of the art; Be necessary to propose not network connection of the distributed energy electricity generation grid-connecting scheme that a kind of existing theoretical policy support has the promotional value put into practice again; To have great realistic significance to the fast development of wind-powered electricity generation, photovoltaic distributed energy industry; And along with progressively ripe with interconnection technology of becoming better and approaching perfection day by day of energy policy, can on the existing hardware basis, accomplish functions expanding smoothly, thereby realizing that distributed energy generates electricity surfs the Net.
The utility model content
The purpose of the utility model provides a kind of microgrid system that is incorporated into the power networks and does not surf the Net.
To achieve these goals, the utility model adopts following technical scheme:
A kind of microgrid system that do not surf the Net that is incorporated into the power networks comprises distributed generation system, distributed energy-storage system, user load and microgrid central controller; Said distributed generation system and distributed energy-storage system insert the low-voltage alternating-current bus through energy conversion devices separately, and the low-voltage alternating-current bus inserts the high-voltage alternating bus through step-up transformer again; User load inserts the high-voltage alternating bus with the mode of dividing into groups through step-up transformer; The high-voltage alternating bus inserts public electric wire net through the points of common connection single-point; The points of common connection place is provided with static switch; Said microgrid central controller is connected through the cable communication with distributed generation system, distributed energy-storage system and static switch.
Further, said distributed generation system comprises wind generator system, photovoltaic generating system; Said distributed energy-storage system comprises battery energy storage system.
Further, said user load comprises load on the spot and conventional load; Said load on the spot realizes the quick switching between itself and public electric wire net and this duplex feeding system of little electrical network through convertible static switch.
Further, be provided with the reverse power protection device at the points of common connection place of said high-voltage alternating bus and public electric wire net.
Further, also be provided with unidirectional electric power meter at the points of common connection place of said high-voltage alternating bus and public electric wire net.
Owing to adopt technique scheme, the utlity model has following beneficial effect:
1, the utility model bases oneself upon " be incorporated into the power networks and do not surf the Net " operational mode; Basically do not changing under the situation of original distribution system structure; Utilize the microgrid integrated technology polytype distributed power source; Effectively integrate like wind power system, photovoltaic generating system and energy-storage system etc., incorporate public electric wire net together into user load, be incorporated into the power networks through rational load planning and the realization of energy management initiatively microgrid system and do not surf the Net through ac bus.On the one hand; Through the management of microgrid central controller active energy, generation of electricity by new energy is generated power for their own use fully, does not oppositely send to public network; In the need for electricity and maximum using generation of electricity by new energy that effectively reduce public electric wire net, can also avoid the normal power supply of public electric wire net is impacted.On the other hand, rely on the support of public electric wire net, customer charge obtains the better power supply reliability and the quality of power supply; This scheme is specially adapted to city photovoltaic roof working, and the BIPV power station can effectively overcome large-scale photovoltaic electricity generation grid-connecting difficulty under existing be incorporated into the power networks policy and the technical conditions, further enlarges its application scale, has sizable actual application value.
2, the utility model is taken into account " independent of net " operational mode; When public electric wire net is unavailable; By distributed generation system, distributed energy-storage system and on the spot load constitute one independently from the net system, keep system voltage and frequency stabilization and microgrid system power balance, and emergency power supply be provided; Possess good engineering demonstration benefit, bring about entirely new prospect for what wind-powered electricity generation, photovoltaic distributing inserted.
3, the utility model is provided with the reverse power protection device between high-voltage alternating bus and public electric wire net, under the inefficacy of microgrid central controller or other abnormal conditions, can prevent anti-power delivery through the reverse power protection device, and system provides backup protection for microgrid.
4, the utility model inserts being incorporated into the power networks of distributed energy and has the effect of forming a connecting link; On the one hand under current policy and technical conditions; Actively push forward the access of being incorporated into the power networks of new forms of energy, on the other hand, along with progressively ripe with interconnection technology of becoming better and approaching perfection day by day of energy policy; Can on the existing hardware basis, accomplish functions expanding smoothly, thereby realize distributed energy generating online.
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Description of drawings
Fig. 1 major loop sketch map of microgrid system of not surfing the Net that is incorporated into the power networks for the utility model is a kind of.
Embodiment
Describe below in conjunction with the preferred embodiment of accompanying drawing, should be appreciated that preferred embodiment described herein only is used for explanation and explains the utility model, and be not used in qualification the utility model the utility model.
The be incorporated into the power networks microgrid system configuration of not surfing the Net of the utility model a kind of is as shown in Figure 1, comprises distributed generation system (wind generator system, photovoltaic generating system), distributed energy-storage system (battery energy storage system) and user load (load on the spot, conventional load); Wherein, distributed generation system and distributed energy-storage system pass through the low-voltage alternating-current bus of energy conversion devices access 380V separately, and the low-voltage alternating-current bus is incorporated into the power networks through the high-voltage alternating bus realization interchange of step-up transformer access 10kV again; User load passes through the high-voltage alternating bus that step-up transformer inserts 10kV with the mode of dividing into groups, from the power taking of high-voltage alternating bus; The high-voltage alternating bus inserts public electric wire net through points of common connection (PCC) single-point; Wherein, the points of common connection place is provided with static switch (K0); Load is through convertible static switch (K on the spot
Ld1-3) realize the quick switching between itself and public electric wire net and this duplex feeding system of little electrical network.The microgrid system that do not surf the Net of being incorporated into the power networks also comprises microgrid central controller (MGCC), and the microgrid central controller is connected through the cable communication with distributed generation system, distributed energy-storage system and each static switch; Points of common connection place at high-voltage alternating bus and public electric wire net is provided with the reverse power protection device; Points of common connection place at high-voltage alternating bus and public electric wire net also is provided with unidirectional electric power meter.
Wherein:
Static switch: when externally public electric wire net runs into serious power quality problem, can make microgrid withdraw from main electrical network rapidly, get into the isolated island mode operation, and possess and prevent unplanned isolated island defencive function.After main power system restoration was normal, static switch can be connected to the grid microgrid the same period safely; In addition, static switch also is used for the double loop power supply switching of important load on the spot.
Microgrid central controller (MGCC): carry out communication management through distributed generation system, distributed energy-storage system in the communications cable and the system; And each and site switch controlled; Power is not counter under main realization " be incorporated into the power networks and do not surf the Net " operational mode send; System power balance under " independent " operational mode from net, and be incorporated into the power networks and the mode switch function between the network operation mode.
The reverse power protection device: the not network connection mode that is incorporated into the power networks is less to the influence of system's relaying protection, but need dispose independently reverse power protection, prevents that microgrid from sending electric power to public electric wire net.
Electric power meter: unidirectional electric power meter, the electric weight that unidirectional metering user obtains from public electric wire net are installed at points of common connection.
For the abundant safeguards system safe and stable operation that " is incorporated into the power networks and do not surf the Net ", the control and the guard method of microgrid system of not surfing the Net of being incorporated into the power networks proposed " safety guarantee defence line, three roads ":
At first be the power ACTIVE CONTROL of distributed energy-storage system, when microgrid system either electric light volt energy output or customer charge changed, energy-storage system can make an immediate response, and plays the effect of balanced power.Totally load scale under the basic premise of wind light generation capacity the user, be aided with the active adjustment function of energy-storage system, can satisfy in most cases power folk prescription to flowing.
Next is the limit power operation Passive Control of distributed generation system (intermittent grid-connected power generation system); When microgrid system wind light generation amount greater than customer charge, and when absorbing active power and also be difficult to satisfy microgrid internal power balance, in view of the grouping control flexibility of photovoltaic generating system through energy-storage system charging; Can limit photovoltaic generation output earlier; Carry out the control of wind-powered electricity generation limit power again, under extreme case, even cut entirely.Otherwise, when customer charge increases, divide into groups to drop into photovoltaic system and wind-powered electricity generation unit, fully ensureing under the not anti-situation about sending of power, utilize regenerative resource to greatest extent.
Be the inverse probability backup protection at last; Under nominal situation through microgrid central controller (MGCC) control energy-storage system discharge and recharge and the switching of wind-powered electricity generation photovoltaic system is realized the internal power balance of whole microgrid system guaranteeing that the power of points of common connection (PCC) position flows to the microgrid system from public electric wire net all the time; Under microgrid central controller (MGCC) inefficacy or other abnormal conditions, through reverse power protection device preventing anti-power delivery.Protection is totally independent of control, has further ensured the power one-way flow of points of common connection.
Be incorporated into the power networks the do not surf the Net course of work of microgrid system of the utility model a kind of is:
(K0, K1, K2 closure, the while is the static switch K of load on the spot when being incorporated into the power networks
Ld1-3Be in " 0 " position; Whole like this microgrid system locates to insert public electric wire net through the 10kV ac bus at points of common connection (PCC)) require " be incorporated into the power networks and do not surf the Net "; Adjusting through microgrid central controller (MGCC); Control whole microgrid system only to the public electric wire net power taking, and do not send to public electric wire net.
(K1, K2 break off, simultaneously the static switch K of load on the spot independent during from network operation
Ld1-3Switch to " 1 " position; Scene storage constitutes independent of the net system with load on the spot like this); Energy-storage system provides the voltage and the frequency reference of ac bus, and wind-powered electricity generation and photovoltaic generating system are pooled to ac bus and energy-storage system provides reliable and stable supply of electric power for together load on the spot.
Be incorporated into the power networks at microgrid and do not surf the Net under the operational mode, our definition:
∑ Pwind-wind-powered electricity generation unit gross capability
∑ Ppv-photovoltaic generating system is exerted oneself
∑ Pload-system's total load (comprising load on the spot and conventional load here)
Δ Load-system's net load
The minimum net load of Δ Lmin-system
Δ Pdis-discharge threshold value (Δ Pdis>Δ Lmin)
Δ Load=∑ Pload-∑ Pwind-∑ Ppv then,
When the net load Δ Load of system when the current capacity of Δ Lmin and energy-storage system does not reach its upper energy limit, the countermeasure that just can take the initiative: at first adjust the energy storage charge power, absorbing redundant active power; Next limits photovoltaic power output, even excises blower fan again and ensure that power is not counter and send;
As the net load Δ Load of system>Δ Pdis and the current capacity of energy-storage system do not reach under its energy in limited time, and then energy storage system discharges discharges active power and supplies with local load, and wherein net load deducts the energy storage delivered power unnecessary part is provided by public electric wire net.When the net load Δ Load of system is big, can divide into groups to drop into photovoltaic and wind-powered electricity generation unit simultaneously, strive for honourable utilization of resources maximization according to actual conditions.
Under the network operation mode, we define independent:
∑ Pload-system's total load (only referring to load on the spot here)
∑ Pess-energy-storage system power
Δ P-system's net power
Then net power Δ P=∑ Pwind+ ∑ Ppv-∑ Pload gets energy-storage system power ∑ Pess=Δ P.Net power for just and the current capacity of energy-storage system when reaching its upper energy limit, the energy-storage system charging absorbs energy; Net power is not prescribed a time limit for negative and the current capacity of energy-storage system reach under its energy, and energy storage system discharges releases energy.
Here wind-powered electricity generation and photovoltaic system are realized permanent power control, and energy-storage system is realized electric voltage frequency control, and promptly energy-storage system is kept the power-balance of whole independence from the net system when system voltage and frequency reference are provided.
What should explain at last is: the above is merely the preferred embodiment of the utility model; Be not limited to the utility model; Although the utility model has been carried out detailed explanation with reference to previous embodiment; For a person skilled in the art, it still can be made amendment to the technical scheme that previous embodiment is put down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (5)
1. the microgrid system that do not surf the Net that is incorporated into the power networks is characterized in that, comprises distributed generation system, distributed energy-storage system, user load and microgrid central controller;
Said distributed generation system and distributed energy-storage system insert the low-voltage alternating-current bus through energy conversion devices separately, and the low-voltage alternating-current bus inserts the high-voltage alternating bus through step-up transformer again; User load inserts the high-voltage alternating bus with the mode of dividing into groups through step-up transformer; The high-voltage alternating bus inserts public electric wire net through the points of common connection single-point; The points of common connection place is provided with static switch;
Said microgrid central controller is connected through the cable communication with distributed generation system, distributed energy-storage system and static switch.
2. the microgrid system that do not surf the Net that is incorporated into the power networks according to claim 1 is characterized in that said distributed generation system comprises wind generator system, photovoltaic generating system; Said distributed energy-storage system comprises battery energy storage system.
3. the microgrid system that do not surf the Net that is incorporated into the power networks according to claim 1 is characterized in that said user load comprises load on the spot and conventional load;
Said load on the spot realizes the quick switching between itself and public electric wire net and this duplex feeding system of little electrical network through convertible static switch.
4. according to each described microgrid system that do not surf the Net that is incorporated into the power networks of claim 1-3, it is characterized in that, be provided with the reverse power protection device at the points of common connection place of said high-voltage alternating bus and public electric wire net.
5. according to each described microgrid system that do not surf the Net that is incorporated into the power networks of claim 1-3, it is characterized in that, also be provided with unidirectional electric power meter at the points of common connection place of said high-voltage alternating bus and public electric wire net.
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| CN2012202481680U CN202602306U (en) | 2012-05-29 | 2012-05-29 | Grid-connected offline micro-grid system |
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| CN2012202481680U CN202602306U (en) | 2012-05-29 | 2012-05-29 | Grid-connected offline micro-grid system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN103066585A (en) * | 2012-12-13 | 2013-04-24 | 中国矿业大学 | Power supply detection and abnormal reverse power transmission control device |
| CN103872702A (en) * | 2014-03-13 | 2014-06-18 | 中国能源建设集团广东省电力设计研究院 | Main wiring structure of intelligent MG (microgrid) power distribution network |
| CN104333042A (en) * | 2014-11-17 | 2015-02-04 | 国网上海市电力公司 | Energy storage current transformer grid connection and grid disconnection seamless switching device and method |
| CN107453414A (en) * | 2017-09-18 | 2017-12-08 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of portable micro-grid system |
| CN110224432A (en) * | 2019-06-13 | 2019-09-10 | 乐山一拉得电网自动化有限公司 | A kind of box-type substation and its microgrid system control method |
| CN112350368A (en) * | 2020-10-13 | 2021-02-09 | 芜湖泰伦特能源科技有限公司 | Off-grid and on-grid control method for micro-grid |
-
2012
- 2012-05-29 CN CN2012202481680U patent/CN202602306U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664429A (en) * | 2012-05-29 | 2012-09-12 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN102664429B (en) * | 2012-05-29 | 2014-05-14 | 国电联合动力技术有限公司 | Grid-connected non-networking micro-grid system and control protection method thereof |
| CN103066585A (en) * | 2012-12-13 | 2013-04-24 | 中国矿业大学 | Power supply detection and abnormal reverse power transmission control device |
| CN103872702A (en) * | 2014-03-13 | 2014-06-18 | 中国能源建设集团广东省电力设计研究院 | Main wiring structure of intelligent MG (microgrid) power distribution network |
| CN103872702B (en) * | 2014-03-13 | 2016-03-16 | 中国能源建设集团广东省电力设计研究院有限公司 | A kind of intelligent micro-grid distribution network main electrical scheme structure |
| CN104333042A (en) * | 2014-11-17 | 2015-02-04 | 国网上海市电力公司 | Energy storage current transformer grid connection and grid disconnection seamless switching device and method |
| CN107453414A (en) * | 2017-09-18 | 2017-12-08 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of portable micro-grid system |
| CN110224432A (en) * | 2019-06-13 | 2019-09-10 | 乐山一拉得电网自动化有限公司 | A kind of box-type substation and its microgrid system control method |
| CN112350368A (en) * | 2020-10-13 | 2021-02-09 | 芜湖泰伦特能源科技有限公司 | Off-grid and on-grid control method for micro-grid |
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Owner name: NATIONAL ELECTRIC NEW ENERGY TECHNOLOGY INSTITUTE Effective date: 20130703 |
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Effective date of registration: 20130703 Address after: 100000 Beijing City, Zhongguancun, South Street, building B, building No., level 56, level 16 Patentee after: Guodian United Power Technology Co., Ltd. Patentee after: Guodian New Energy Technology Institute Address before: 100000 Beijing City, Zhongguancun, South Street, building B, building No., level 56, level 16 Patentee before: Guodian United Power Technology Co., Ltd. |
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Granted publication date: 20121212 |