CN102074952B - Independent micro-grid system - Google Patents
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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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
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/14—District level solutions, i.e. local energy networks
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/14—Energy storage units
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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Abstract
The invention discloses an independent micro-grid system which is used for connecting different types of regenerative-energy power supplies, loads, energy storage devices and the like together through electric and electronic devices and through a power transmission network to form an independent running micro-grid system, so that a stable and reliable power supply is provided for the loads by mainly using large-scale power generation from regenerative energy sources and secondly using power generation from traditional energy sources. The system provided by the invention is beneficial to design, control, maintain and expansion of the micro grid, and thus the power-supply stability and economical efficiency of the micro grid can be improved.
Description
Technical field
The present invention relates to micro-grid system, particularly a kind of independent micro-grid system based on renewable energy power generation.
Background technology
Tapping a new source of energy and regenerative resource, is the inevitable choice that solves China's energy scarcity, using energy source and environmental protection contradiction.Renewable energy power generation has the characteristics such as randomness, discontinuity, energy-flux density is low, and the electric power that only relies on regenerative resource to send often can not guarantee the continuous energy supply of loading.Such as, wind energy, solar energy, oceanic energy etc.
Because the characteristics of the output energy change at random that regenerative resource has, therefore, the extensive direct grid-connected of regenerative resource brings very large impact can for little electrical network, affect stability and the electric energy quality of little electrical network, when little electrical network is not connected with large electrical network, affect particularly evident when being in independent operation mode.
Therefore, core key technology problem how to utilize the reliable and stable little electrical network of the regenerative resource electric power generating composition of multiple output electric energy change at random will solve with regard to the little electrical network of independence that becomes based on the multiple renewable energy sources generating.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of independent micro-grid system, the space-time that takes full advantage of regenerative resource is complementary, improve the economy of energy supplying system, for the user provides reliability height, good stability, the excellent green electric power supply of cost performance, realize extensive efficient utilization of regenerative resource.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of independent micro-grid system wherein, comprises voltage node, generating set, the first load, electric power transmission network and a plurality of zone and a plurality of interconnection switch; Each zone comprises a power node; Each power node further comprises renewable energy power generation power supply, the second energy storage device, three port current transformers and the second load; Described voltage node further comprises the first energy storage device and two way convertor; Described the first energy storage device is connected to electric power transmission network by two way convertor, described generating set and the first load are directly connected to respectively electric power transmission network, described renewable energy power generation power supply and the second energy storage device are connected on the interconnection switch by three port current transformers respectively, and described the second load is connected to electric power transmission network by interconnection switch.
Described independent micro-grid system wherein, also comprises the second renewable energy power generation power supply and the second combining inverter; Described the second renewable energy power generation power supply is connected to electric power transmission network by the second combining inverter.
Described independent micro-grid system, wherein, each zone also comprises power quality controlling unit, the 3rd renewable energy power generation power supply and the 3rd combining inverter; Described power quality controlling unit is connected to electric power transmission network by corresponding interconnection switch; Described the 3rd renewable energy power generation power supply is connected to electric power transmission network by the 3rd combining inverter with corresponding interconnection switch.
Described independent micro-grid system, wherein, described generating set is diesel generating set or fuel gas generation unit.
Described independent micro-grid system, wherein, described renewable energy power generation power supply comprises wind power generation, solar power generation, power generation with marine energy, biomass power generation.
Described independent micro-grid system, wherein, described the first energy storage device and the second energy storage device all are electrochemical energy storage devices.
Described independent micro-grid system, wherein, described electrochemical energy storage device is that lead-acid battery, nickel are that battery, lithium are battery, flow battery or sodium-sulphur battery.
Described independent micro-grid system, wherein, described electric power transmission network is topological structure.
Described independent micro-grid system, wherein, described topological structure is star, annular or tree-like.
Described independent micro-grid system, wherein, described independent micro-grid system also comprises step-up transformer and step-down transformer, described step-up transformer and step-down transformer are connected on the electric power transmission network.
A kind of independent micro-grid system provided by the invention, be used for polytype renewable energy power generation power supply, load, energy storage device etc. are coupled together the micro-grid system that consists of independent operating by power electronic equipment and electric power transmission network, extensive generating with regenerative resource is utilized as the master, the conventional energy resource generating is auxiliary, for load provides reliable and stable supply of electric power.This system is conducive to design, control, maintenance and the dilatation of little electrical network, can improve the power supply reliability of little electrical network, economy.
Description of drawings
Fig. 1 is the schematic configuration schematic diagram of the independent micro-grid system of the embodiment of the invention;
Fig. 2 is the composition structural representation of the independent micro-grid system of first embodiment of the invention;
Fig. 3 is the composition structural representation of the independent micro-grid system of second embodiment of the invention.
Embodiment
The invention provides a kind of independent micro-grid system, the space-time that takes full advantage of regenerative resource is complementary, improve the economy of energy supplying system, for the user provides reliability height, good stability, the excellent green electric power supply of cost performance, realize extensive efficient utilization of regenerative resource.
For making purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail referring to the accompanying drawing examples.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
See also Fig. 1, Fig. 1 is the schematic configuration schematic diagram of the independent micro-grid system of the embodiment of the invention.As shown in the figure, independent micro-grid system comprises voltage node, generating set, the first load, electric power transmission network and a plurality of zone (comprising zone 1, regional 2...... zone N) and a plurality of interconnection switch (comprising interconnection switch 1, interconnection switch 2...... interconnection switch N); Described voltage node, generating set, the first load are connected respectively on the electric power transmission network, and each zone is connected to electric power transmission network by an interconnection switch.
The dilatation of described micro-grid system is carried out as the unit take the zone, the modular construction that the zone has identical (or similar), and each zone includes power node, realizes the on the spot generation of energy and on the spot consumption.
Each zone is connected with electric power transmission network by corresponding interconnection switch, when both were communicated with, the zone showed as a controlled node on the micro-grid system, the just characteristic of this controlled node on the whole, so that the stable control of micro-grid system, it is easier that the optimization adjusting implements.The trend at interconnection switch place can be controlled according to different targets, and the electric energy on electric power transmission network is abundant, and when satisfying the need for electricity of the first load fully, the trend that can control the interconnection switch place is zero, realizes the self-sufficient of power supplied locally; When having more energy storage in the zone, the trend that can control corresponding interconnection switch place is that set point is exported energy to little electrical network, and this time domain is a power stage source with respect to the external world; When outside energy is more than needed and when also not being in full state in the zone, also extraneous excess energy can be stored in the zone, this time domain is a load for extraneous.When because micro-grid system breaks down, and the zone can also provide independently voltage support for the first load, realize local independently-powered.
Described the first load comprises conventional commercial power load, also can comprise Peak Load, central heating device for example, the central cooling device, ice storage unit etc., at a low ebb when the first load electricity consumption, the unlatching Peak Load effectively utilizes renewable energy power generation when having more than needed and the renewable energy power generation power supply generates electricity.
Please further consult Fig. 2, Fig. 2 is the composition structural representation of the independent micro-grid system of first embodiment of the invention.As shown in the figure, described voltage node comprises the first energy storage device, two way convertor; Described power node comprises renewable energy power generation power supply, the second energy storage device, three port current transformers and the second load; Described the first energy storage device is connected on the electric power transmission network by two way convertor, described generating set and the first load are directly connected to electric power transmission network, described renewable energy power generation power supply and the second energy storage device are connected on the interconnection switch by three port current transformers respectively, and the second load is connected on the electric power transmission network by interconnection switch.
The composition structure of described independent micro-grid system, for polytype renewable energy power generation power supply, load, energy storage device etc. and electric power transmission network being coupled together the micro-grid system that consists of independent operating, extensive generating with regenerative resource is utilized as the master, the conventional energy resource generating is auxiliary, for load provides reliable and stable supply of electric power.The method comprises: energy storage device and two way convertor consist of the voltage node of little electrical network, support for micro-grid system provides the three-phase voltage of amplitude and frequency stabilization; Renewable energy power generation power supply, energy storage device and three port current transformers consist of the power node of little electrical network, can be to stablize controlled power stream to output to micro-grid system with the renewable energy conversion of input fluctuation, can with the power storage in the micro-grid system in energy storage device, realize the two-way controllable flow of energy again.
Specifically, the first energy storage device comprises that lead-acid battery, nickel are that battery, lithium are the electrochemical energy storage devices such as battery and flow battery, sodium-sulphur battery, also can comprise various electric capacity.The first energy storage device is realized the extensive quick storage of electric energy, can tolerate quick charge or discharge.Two way convertor is the voltage-type 3-phase power converter, is comprised of two parts, and left-hand component is the DC converting link, directly is connected with the first energy storage device, realizes the charge/discharge to the first energy storage device.According to the needs of practical application, can comprise and boosting, step-down, the DC transfer circuit of the various functions such as buck can be Boost, Buck, the various forms of circuit topologies such as Buck-boost.Right-hand component is DC-AC inversion link, all can keep the output voltage of three-phase equilibrium under any uncompensated load, can be and realizes the randomly topologically structured of three-phase equilibrium Voltage-output.The first energy storage device and two way convertor support for micro-grid system provides the three-phase voltage of amplitude and frequency stabilization together, and energy can be realized two-way flowing freely via two way convertor between little electrical network and the first energy storage device.
Generating set is connected on the electric power transmission network, by to the first energy storage device residue energy storage assessment, on the power consumption prediction basis of the first load, judges the power shortage of micro-grid system.Get final product the pre-cooling generating set when energy shortage, and make generating set with rated power output operation a period of time, generating set operates in the peak efficiency state, if there is unnecessary energy will be stored in the first energy storage device.
Further, described generating set can be the fuel electric generator group, also can be the gas electricity generator group.
Described renewable energy power generation power supply, the second energy storage device and three port current transformers form the energy smooth unit, and wherein core apparatus is three port current transformers.Three port current transformers are comprised of three parts, and the DC part in left side directly is connected with the renewable energy power generation power supply, the direct and little grid power transmission network connection of AC part on right side, and middle DC part directly is connected with the second energy storage device.The at random instant maximum power that the DC-DC link of left side and centre is sent the renewable energy power generation power supply is converted to direct current and is stored in the second energy storage device.Middle DC-AC link with the right side is transported to the form of the direct current in the second energy storage device with controlled AC power source (controlled active power and/or reactive power output) in the micro-grid system, perhaps with the form of controlled AC power source (controlled active power and/or reactive power output) with the power delivery in little electrical network in the second energy storage device.The energy smooth unit can realize that the controllable bidirectional of energy flows freely.When the renewable energy power generation power supply is abundant, with the regenerative resource of at random input through storage level and smooth after, be converted to and stablize controlled AC power and be transported in little electrical network.Energy in little electrical network is more than needed, be that other local renewable energy power generation is when more than needed, unnecessary energy storage can be stored in the second energy storage device, therefore can realize the mutual support of energy between a plurality of energy smooth unit, mutually regulate, improved reliability and the controllability of system.
In addition, described independent micro-grid system can also comprise the second renewable energy power generation power supply and the second combining inverter; Described the second renewable energy power generation power supply is connected to electric power transmission network by the second combining inverter.In this case, regenerative resource input at random immediately is converted into output electric energy at random, form with current source is injected in the micro-grid system, the stability of micro-grid system is brought very large impact, and the quality of power supply is brought very large negative effect, the voltage flickers that cause such as wind power generation etc., therefore this proportion of form in little electrical network that utilizes can not be too large, only suitablely adopts on a small scale.
Further, can also according to the practical application needs, can comprise that described power quality controlling unit, power quality controlling unit comprises reactive power compensator, dynamic voltage compensator in the described zone, the power quality controlling devices such as harmonic treating apparatus satisfy the user to the requirement of power quality; Also can adopt part the 3rd renewable energy power generation power supply through the 3rd combining inverter direct grid-connected.At random regenerative resource input immediately is converted into output electric energy at random in this case, form with current source is injected in the micro-grid system, the stability of micro-grid system is brought very large impact, and the quality of power supply is brought very large negative effect, voltage flicker that causes such as wind power generation etc., therefore this proportion of form in the structure of independent micro-grid system of the present invention that utilizes can not be too large, only suitable on a small scale employing.Excessive for fear of random shock, also can in independent micro-grid system of the present invention, cancel the form of utilizing of this direct grid-connected output.
In addition, the electric power transmission network of described micro-grid system can be star, annular, any suitable topological structure such as tree-like, and the power transmission and transformation part can increase step-up transformer as required, step-down transformer, and described step-up transformer and step-down transformer are connected on the electric power transmission network.
Please continue to consult Fig. 3, Fig. 3 is the composition structural representation of the independent micro-grid system of second embodiment of the invention.This is the structure structure of an island independent micro-grid system.Described micro-grid system is comprised of 3 zones, electric power transmission network, batteries, two way convertor, diesel generating set etc.Batteries and two way convertor consist of the voltage node (balance node) of little electrical network, support for little electrical network provides the three-phase voltage of amplitude and frequency stabilization.The composition in zone 1 and zone 2 is identical, each zone forms by energy smooth unit, local load, power quality controlling unit, building photovoltaic and combining inverter, wherein, in the present embodiment, described regional 1 and zone 2 energy smooth unit comprise photovoltaic, batteries and three port transformers, the energy smooth unit be input as photovoltaic.Zone 3 is comprised of energy smooth unit, Peak Load (ice accumulation of energy), power generation with marine energy, Biogas Generator Set, photovoltaic, combining inverter, for micro-grid system provides powerful power injection.Wherein, described regional 3 energy smooth unit comprises blower fan (wind-driven generator), batteries and three port transformers, and it is input as blower fan.Diesel generating set starts when the regenerative resource supply of electric power is not enough, operates in rated output power and provides auxiliary supply of electric power for little electrical network.The island load has local characteristics of assembling, and therefore electric power transmission network shown in Figure 3 adopts the middle pressure electric power transmission network of 380V-10KV-380V.
The independent little electrical network in island shown in Figure 3, take full advantage of the solar energy on island, wind energy, the renewable energy power generations such as oceanic energy, and the island house refuse is processed (being used for biogas power generation), utilize the low power consumption of little electrical network to carry out cold storage of ice making, the commercial and fishery cooling for the island, so the micro-grid system has here promoted the Island Economy social development greatly for the island energy provides a comprehensive solution.Little electric network composition shown in Figure 3 is clear, is easy to expansion, has larger promotional value.
Independent micro-grid system of the present invention presents the layered distribution type general layout, and each zone had both kept relative independence, can intercommunicate support again, carries out Power Exchange.This networking mode also helps the scheduling controlling of independent micro-grid system, its layered distribution type structure was so that both can carry out Local Optimization Algorithm, can also carry out global optimization approach, each Regional Synergetic effect so that the charge and discharge maintenance work of energy storage device become easier and do not produce extra consumption.
A kind of independent micro-grid system provided by the present invention, the space-time that takes full advantage of regenerative resource is complementary, improve the economy of energy supplying system, for the user provides reliability height, good stability, the excellent green electric power supply of cost performance, realize extensive efficient utilization of regenerative resource.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (9)
1. an independent micro-grid system is characterized in that, comprises voltage node, generating set, the first load, electric power transmission network and a plurality of zone and a plurality of interconnection switch; Each zone comprises a power node; Each power node further comprises renewable energy power generation power supply, the second energy storage device, three port current transformers and the second load; Described voltage node further comprises the first energy storage device and two way convertor; Described the first energy storage device is connected to electric power transmission network by two way convertor, described generating set and the first load are directly connected to respectively electric power transmission network, described renewable energy power generation power supply and the second energy storage device are connected on the interconnection switch by three port current transformers respectively, and described the second load is connected to electric power transmission network by interconnection switch.
2. independent micro-grid system according to claim 1 is characterized in that, also comprises the second renewable energy power generation power supply and the second combining inverter; Described the second renewable energy power generation power supply is connected to electric power transmission network by the second combining inverter.
3. independent micro-grid system according to claim 1 and 2 is characterized in that, each zone also comprises power quality controlling unit, the 3rd renewable energy power generation power supply and the 3rd combining inverter; Described power quality controlling unit is connected to electric power transmission network by corresponding interconnection switch; Described the 3rd renewable energy power generation power supply is connected to electric power transmission network by the 3rd combining inverter with corresponding interconnection switch.
4. independent micro-grid system according to claim 1 is characterized in that, described generating set is diesel generating set or fuel gas generation unit.
5. independent micro-grid system according to claim 1 is characterized in that, described renewable energy power generation power supply comprises wind power generation, solar power generation, power generation with marine energy, biomass power generation.
6. independent micro-grid system according to claim 1 is characterized in that, described the first energy storage device and the second energy storage device all are electrochemical energy storage devices.
7. independent micro-grid system according to claim 6 is characterized in that, described electrochemical energy storage device is that lead-acid battery, nickel are that battery, lithium are battery, flow battery or sodium-sulphur battery.
8. independent micro-grid system according to claim 1 is characterized in that, the topological structure of described electric power transmission network is star, annular or tree-like.
9. independent micro-grid system according to claim 1 is characterized in that, described independent micro-grid system also comprises step-up transformer and step-down transformer, and described step-up transformer and step-down transformer are connected on the electric power transmission network.
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