CN207910487U - A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption - Google Patents
A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption Download PDFInfo
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- CN207910487U CN207910487U CN201820027621.2U CN201820027621U CN207910487U CN 207910487 U CN207910487 U CN 207910487U CN 201820027621 U CN201820027621 U CN 201820027621U CN 207910487 U CN207910487 U CN 207910487U
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Abstract
A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption, including：One direct-current micro-grid group network system, at least one wind power plant, at least one large-capacity power transformation system, one ac bus, one wind-powered electricity generation conveys special line, the direct-current micro-grid group network system, including at least two direct-current micro-grid units, one system-level control centre, the wind power plant is connected by large-capacity power transformation system with ac bus, the ac bus is connected with wind-powered electricity generation conveying special line, and the wind-powered electricity generation conveying special line is connected with the direct-current micro-grid unit that direct-current micro-grid group network system is included, and the system-level control centre is connected with each direct-current micro-grid unit.The utility model solves the problems, such as the consumption of high-power wind turbine difficulty, abandons higher wind rate, excess capacity and electric vehicle charging load to distribution capacity and the high problem of capacity requirement that generates electricity simultaneously.
Description
Technical field
The utility model belongs to micro-capacitance sensor technical field, and in particular to a kind of direct current suitable for high-power wind turbine consumption is micro-
Net group network system.
Background technology
In recent years, to cope with global warming, the clean energy resource of alternative oil will all be sought and develop in countries in the world
It is promoted on the height of entire energy strategy.Wind energy is generally acknowledged to generate electricity by the whole world as one of cleaning new energy, using wind-force
It is the effective scheme that climate change can be effectively relieved, improve energy security, low-carbon economy is promoted to increase, therefore, wind-power electricity generation
Obtain the highest attention of national governments, mechanism and enterprise etc..For China, Wind Power Development is even more with the speed of " Great Leap Forward formula "
It grows rapidly, becomes that global wind-power electricity generation is largest, fastest-rising market.However, the background advanced triumphantly in wind-powered electricity generation it
Under, but there are a series of urgent problems to be solved, such as abandon wind and ration the power supply seriously, wind electricity digestion is difficult, grid-connected to be obstructed, excess capacity
Deng.At the same time, new energy is made full use of in order to improve, in World Automobile Industry, has also started development new-energy automobile
Upsurge.Various countries fully pay attention to the development and popularization and application of electric vehicle, and China is also using Development of EV as the reply energy, ring
Border and climate change challenge, one of the optimal path for keeping sustainable development.However, greatly developing electric vehicle and implementing vapour
The problem of during vehicle industrial transformation strategy, also encountering many problems, removing electric vehicle itself and electric vehicle charging and conversion electric
Outside the problems such as auxiliary facility is unsound, it is necessary to pay attention to the impact to power grid and shadow when electric vehicle charging and conversion electric load accesses power grid
It rings, payes attention to the electric vehicle requirements at the higher level that access proposes net capacity and electricity generation system capacity on a large scale.In face of problem above,
One side wind energy cannot be utilized efficiently, and the extensive access of the consumption of wind-powered electricity generation difficulty, excess capacity, another aspect electric vehicle needs
More electric energy supplies, need to improve power system capacity, have researcher to propose by building direct-current micro-grid or AC microgrids or alternating current-direct current
The scheme of micro-capacitance sensor is mixed to solve the problems, such as influence of the electric vehicle charging and conversion electric to power grid, the program by distributed power generation with it is electronic
Automobile charging and conversion electric is combined, and alleviating electric vehicle using the distributed power generation energy supply in direct-current micro-grid influences the impact of power grid,
Idea is feasible, still, can not still solve the problems, such as that high-power wind turbine dissolves, because single direct-current micro-grid operation inertia is small, Shandong
Stick is poor, and power supply characteristic difference is big, does not have stronger new energy digestion capability, it is difficult to stabilize asking for wind power fluctuation
Topic.
Invention content
For deficiencies of the prior art, the utility model solves the consumption of high-power wind turbine difficulty, abandons wind rate simultaneously
The problem of higher, excess capacity and the electric vehicle charging load problem high to distribution capacity and power generation capacity requirement, propose
A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption.
The technical solution that the utility model is taken is：
A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption, including：
One direct-current micro-grid group network system,
At least one wind power plant,
At least one large-capacity power transformation system,
One ac bus,
One wind-powered electricity generation conveys special line,
The direct-current micro-grid group network system, including：
At least two direct-current micro-grid units,
One system-level control centre, system-level control centre is for coordinating each microgrid unit consumption generation of electricity by new energy work(
The ratio of rate, is mainly made of communication module and data processing module, receives the state of each microgrid unit by communication module
Amount, then calculate by data processing module the dispatch command of each microgrid unit under current state, finally by communication module by this
A little dispatch commands are transmitted to microgrid unit.
The wind power plant is connected by large-capacity power transformation system with ac bus, and the ac bus is conveyed with wind-powered electricity generation
Special line is connected, and the wind-powered electricity generation conveying special line is connected with the direct-current micro-grid unit that direct-current micro-grid group network system is included, the system
Grade control centre is connected with each direct-current micro-grid unit.
The direct-current micro-grid unit includes：
One step-down transformer,
One be made of two breaker/switches and an AC/DC converter and a two-way AC/DC converter it is straight
Microgrid cell scheduling center is flowed,
One DC bus,
At least one distributed generation unit,
At least one AC/DC converters,
At least one AC load,
At least one DC/AC converters,
At least two DC/DC converters,
At least two two-way DC/DC converters,
At least one fuel cell,
At least one photovoltaic generation unit,
At least one energy-storage system,
At least one electric vehicle charge and discharge stake,
At least one DC load；
The end of the wind-powered electricity generation conveying special line is connected with the high-pressure side of step-down transformer, the low pressure of the step-down transformer
Side is connected with one end of the first breaker/switch；The other end of first breaker/switch is exchanged with AC/DC converters
Side is connected, and the DC side of the AC/DC converters is connected with DC bus；
Second breaker/switch one end is connected with power grid, and the second breaker/switch other end becomes with two-way AC/DC
Parallel operation is connected；
Described two-way AC/DC converters one end is connected with the second breaker/switch, the two-way AC/DC converters other end
It is connected with DC bus；
The fuel cell is connected by the first DC/DC converters with DC bus；
The photovoltaic generation unit is connected by the 2nd DC/DC converters with DC bus；
The energy-storage system is connected by the first two-way DC/DC converters with DC bus；
The electric vehicle charge and discharge stake is connected by the second two-way DC/DC converters with DC bus；
The distributed generation unit is connected by AC/DC converters with DC bus；
The AC load is connected by DC/AC converters with DC bus.
Then the electric energy that the wind power plant is sent out passes through wind by large-capacity power transformation system incoming transport busbar
Electric energy is transmitted in each direct-current micro-grid unit in direct-current micro-grid group network system by electricity conveying special line；The system-level control centre
According to the energy supply/demand in each direct-current micro-grid unit, come whether decision high-power wind turbine accesses each direct-current micro-grid unit, and
Instruction is assigned to direct-current micro-grid cell scheduling center；Each direct-current micro-grid cell scheduling center receives and implements system-level tune
The instruction that degree center is assigned, and according to the energy supply/demand inside direct-current micro-grid unit, come decision direct-current micro-grid unit and
Network operation or islet operation pattern.
The electric energy that wind power plant is sent out, after carrying out power converter by large-capacity power transformation system, incoming transport busbar, and
Special line is conveyed by wind-powered electricity generation, electric energy is sent in each direct-current micro-grid unit in direct-current micro-grid group network system, using drop
After pressure transformer decompression, it can be used for direct-current micro-grid.Direct-current micro-grid group network system is by multiple direct-current micro-grids in certain space
Unit carries out networking, improves power system capacity, has high-power wind turbine digestion capability, therefore, for being sent to each direct-current micro-grid
The wind-powered electricity generation of unit, system-level control centre go out whether wind-powered electricity generation connects according to the energy supply/demand in each direct-current micro-grid unit, decision
Enter the direct-current micro-grid unit, when supply falls short of demand for direct-current micro-grid unit self-energy, then by wind power integration direct-current micro-grid unit, i.e.,
Breaker/switch that special line is connected is conveyed with wind-powered electricity generation by controlling in direct-current micro-grid cell scheduling center, wind-powered electricity generation is conveyed into special line
What is sent accesses DC bus after the electric energy of decompression processing carries out power converter by AC/DC converters, with direct current
The power supply units such as distributed generation unit, photovoltaic generation unit in microgrid unit together, are given in direct-current micro-grid unit jointly
Each type load power supply.When the direct-current micro-grid unit self-energy equilibrium of supply and demand, then the direct-current micro-grid unit does not access wind-powered electricity generation, and not to
Bulk power grid conveys electric energy, direct-current micro-grid cell processing islet operation pattern.When drug on the market for direct-current micro-grid unit self-energy, then
Direct-current micro-grid cell operation can be allowed by controlling the breaker/switch being connected with bulk power grid in direct-current micro-grid cell scheduling center
In grid-connect mode, it is incorporated to greatly after the excess energy in direct-current micro-grid unit is carried out power converter by two-way AC/DC converters
In power grid.
Compared to existing micro-capacitance sensor technical solution, a kind of direct current suitable for high-power wind turbine consumption of the utility model is micro-
Net group network system, has the following advantages that：
1, the utility model builds direct-current micro-grid networking, and power system capacity can be improved, and solves the difficulty of high-power wind turbine difficulty consumption
Wind rate is abandoned in topic, reduction.
2, the utility model set wind-powered electricity generation conveying special line, and ad hoc breaker/switch and using multilayer scheduling method to wind-powered electricity generation
Access situation is regulated and controled, and is conducive to while dissolving wind-powered electricity generation, is kept in piconet networking system and direct-current micro-grid unit as possible
Balancing energy.
3, the microgrid unit of the utility model uses DC mode, and the high-power wind turbine and alternating current of alternation can be isolated
Net plays the role of being greatly reduced high-power wind turbine consumption to electric network influencing.
4, New-energy electric vehicle charging pile is included in direct-current micro-grid unit by the utility model, rather than is directly accessed exchange
Power grid carries out charging and conversion electric, the main trend popularized with respect to electric vehicle, while the electricity provided using high-power wind turbine
Influence of the electric vehicle to power grid can be stabilized.
5, compared with existing direct-current grid or alternating current-direct current mixing micro-capacitance sensor, the utility model is suggested plans direct current is micro-
Net unit carries out networking, and power system capacity on the one hand can be improved, and support is provided for high-power wind turbine consumption, on the other hand, for handing over
For the high-power wind turbine and AC network of change, during the power converter of cross-straight-intersection, direct-current micro-grid unit or direct current are micro-
Net networking can play buffer action, and high-power wind turbine is allowed not to be directly incorporated into AC network, and high-power wind turbine will be greatly reduced in this
Consumption is on the impact of power grid and influence.In addition, the utility model, which is suggested plans, sets wind-powered electricity generation conveying special line, the scheduling mould that special line is specially controlled
Formula improves the controllability of system and the flexibility of control, is conducive to balanced direct-current micro-grid unit and direct-current micro-grid group network system
Interior homeostasis energy.In addition to this, the utility model is suggested plans is included in direct-current micro-grid list by electric vehicle charge and discharge stake
It in member, can not only stabilize when electric vehicle accesses on a large scale on the impact of system and influence, moreover it is possible to be carried for balancing energy adjusting
For supporting.
6, the high-power wind turbine and AC network of alternation are isolated using direct-current micro-grid, plays high-power wind turbine is greatly reduced disappears
The effect received to electric network influencing.
Description of the drawings
Fig. 1 is a kind of knot of one embodiment of direct-current micro-grid group network system suitable for high-power wind turbine consumption of the utility model
Structure schematic diagram.
Fig. 2 is the structural representation of one example of DC micro-electric unit in the carried direct-current micro-grid group network system of the utility model
Figure.
Fig. 3 is the structural schematic diagram that large-capacity power transformation series unifies example in the utility model.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, a kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption, including a direct-current micro-grid
Group network system 1, at least one voltage class be 690V to 3.3kV wind power plant 2, at least one large-capacity power transformation system 3,
One ac bus 4, a wind-powered electricity generation convey special line 5；The direct-current micro-grid group network system 1, including at least two direct-current micro-grids
Unit 6, a system-level control centre 7；The wind power plant 2 passes through large-capacity power transformation system 3 and 4 phase of ac bus
Even；The ac bus 4 is connected with wind-powered electricity generation conveying special line 5；The wind-powered electricity generation conveying special line 5 and direct-current micro-grid group network system 1
Including direct-current micro-grid unit 6 be connected；The system-level control centre 7 is connected with each direct-current micro-grid unit 6.
Direct-current micro-grid unit 6 shown in Fig. 2 is exactly an example of the direct-current micro-grid unit 6 in direct-current micro-grid group network system 1
Structural schematic diagram, including a step-down transformer 30, one by the first breaker/switch 9, the second breaker/switch 11, first
The direct-current micro-grid cell scheduling center 8 of AC/DC converters 10, two-way AC/DC converters 12 composition, a DC bus 13, until
Few two DC/DC converters：First DC/DC converters 14, the 2nd DC/DC converters 16, at least two two-way DC/DC transformation
Device：First two-way DC/DC converters 19, the second two-way DC/DC converters 21, at least one fuel cell 15, at least one packet
Photovoltaic generation unit 18 containing photovoltaic module 17, at least one energy-storage system 20 are at least one to be used for what electric vehicle 22 charged
Electric vehicle charge and discharge stake 23, at least one DC load 24, at least one distributed generation unit 25, at least one second
AC/DC converters 26, at least one AC load 27, at least one DC/AC converters 28；The wind-powered electricity generation conveying special line 5
End is connected with the high-pressure side of step-down transformer 30；One end of the low-pressure side and breaker/switch 9 of the step-down transformer 30
It is connected；The other end of first breaker/switch 9 is connected with the exchange side of the first AC/DC converters 10；Described first
The DC side of AC/DC converters 10 is connected with DC bus 13；Second breaker/switch, 11 one end and 29 phase of power grid
Even, the other end is connected with two-way AC/DC converters 12；Described two-way 12 one end of AC/DC converters and 11 phase of breaker/switch
Even, the other side is connected with DC bus 13；The fuel cell 15 passes through the first DC/DC converters 14 and 13 phase of DC bus
Even；The photovoltaic generation unit 18 is connected by the 2nd DC/DC converters 16 with DC bus 13；The energy-storage system 20
It is connected with DC bus 13 by the first two-way DC/DC converters 19；The electric vehicle charge and discharge stake 23 passes through second pair
It is connected to DC/DC converters 21 with DC bus 13；The distributed generation unit 25 by the 2nd AC/DC converters 26 with
DC bus 13 is connected；The AC load 27 is connected by DC/AC converters 28 with DC bus 13.
For the connection relation of Fig. 1 and Fig. 2, specifically, the wind-powered electricity generation conveying special line 5 in Fig. 1 and step-down transformer in Fig. 2
30 high-pressure side is connected, and the system call center 7 in Fig. 1 is connected with the direct-current micro-grid cell scheduling center 8 in Fig. 2.
Fig. 3 show an exemplary construction schematic diagram of the large-capacity power transformation system 3 in Fig. 1, including large capacity AC/AC
32 two parts of converter 31 and step-up transformer.The electric energy that the wind power plant 2 is sent out first passes through large capacity AC/AC current transformers
31 are handled, and are boosted using step-up transformer 32, and ac bus 4 is then incorporated into.
In conclusion a kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption that the utility model is carried,
In order to solve the problems, such as that high-power wind turbine dissolves, multiple direct-current micro-grid units are subjected to networking and centralized dispatching；In order to solve big work(
Rate wind electricity digestion influences problem to the impact of power grid, and the wind-powered electricity generation and AC network of alternation are isolated using DC link, micro- with direct current
Net pattern is powered for system internal loading, even if being incorporated to excess energy in the case where drug on the market for direct-current micro-grid unit self-energy
Power grid, the influence to power grid are also largely weakened；In order to improve the controllability of wind power integration as far as possible and reduce wind
Electricity influences the impact of direct-current micro-grid unit, if wind-powered electricity generation conveys special line, only just when supply falls short of demand for direct-current micro-grid unit self-energy
Access wind-powered electricity generation；In order to take influence problem of the electric vehicle charge and discharge to power grid into account and make full use of electric vehicle charging and conversion electric load
Electric vehicle charge and discharge stake is included in direct-current micro-grid unit by Modulatory character, and in direct-current micro-grid unit self-energy well-balanced adjustment
Play the role of very important.
The above-mentioned implementation example of the utility model is not to this only to illustrate the utility model example
The restriction of the embodiment of utility model.For those of ordinary skill in the art, on the basis of the above description also
Other various forms of variations and variation can be made.Here all embodiments can not be exhaustive.It is every to belong to this
The technical solution changes and variations that derived from of utility model still in the scope of protection of the utility model it
Row.
Claims (2)
1. a kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption, it is characterised in that including：
One direct-current micro-grid group network system（1）,
At least one wind power plant（2）,
At least one large-capacity power transformation system（3）,
One ac bus（4）,
One wind-powered electricity generation conveys special line（5）,
The direct-current micro-grid group network system（1）, including：
At least two direct-current micro-grid units（6）,
One system-level control centre（7）,
The wind power plant（2）Pass through large-capacity power transformation system（3）With ac bus（4）It is connected, the ac bus（4）With
Wind-powered electricity generation conveys special line（5）It is connected, the wind-powered electricity generation conveys special line（5）With direct-current micro-grid group network system（1）Including direct-current micro-grid
Unit（6）It is connected, the system-level control centre（7）With each direct-current micro-grid unit（6）It is connected.
2. a kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption according to claim 1, it is characterised in that：
The direct-current micro-grid unit（6）Including：
One step-down transformer（30）,
One by two breaker/switches and a first AC/DC converter（10）An and two-way AC/DC converter（12）
The direct-current micro-grid cell scheduling center of composition（8）,
One DC bus（13）,
At least one distributed generation unit（25）,
At least one 2nd AC/DC converters（26）,
At least one AC load（27）,
At least one DC/AC converters（28）,
At least two DC/DC converters,
At least two two-way DC/DC converters,
At least one fuel cell（15）,
At least one photovoltaic generation unit（18）,
At least one energy-storage system（20）,
At least one electric vehicle charge and discharge stake（23）,
At least one DC load（24）；
The wind-powered electricity generation conveys special line（5）End and step-down transformer（30）High-pressure side be connected, the step-down transformer
（30）Low-pressure side and the first breaker/switch（9）One end be connected；First breaker/switch（9）The other end and
One AC/DC converters（10）Exchange side be connected, the first AC/DC converters（10）DC side and DC bus（13）
It is connected；
Second breaker/switch（11）One end and power grid（29）It is connected, the second breaker/switch（11）The other end and two-way AC/
DC converters（12）It is connected；
The two-way AC/DC converters（12）One end and the second breaker/switch（11）It is connected, two-way AC/DC converters
（12）The other end and DC bus（13）It is connected；
The fuel cell（15）Pass through the first DC/DC converters（14）With DC bus（13）It is connected；
The photovoltaic generation unit（18）Pass through the 2nd DC/DC converters（16）With DC bus（13）It is connected；
The energy-storage system（20）Pass through the first two-way DC/DC converters（19）With DC bus（13）It is connected；
The electric vehicle charge and discharge stake（23）Pass through the second two-way DC/DC converters（21）With DC bus（13）It is connected；
The distributed generation unit（25）Pass through the 2nd AC/DC converters（26）With DC bus（13）It is connected；
The AC load（27）Pass through DC/AC converters（28）With DC bus（13）It is connected.
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| CN108199408A (en) * | 2018-01-08 | 2018-06-22 | 三峡大学 | A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption |
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| CN108199408A (en) * | 2018-01-08 | 2018-06-22 | 三峡大学 | A kind of direct-current micro-grid group network system suitable for high-power wind turbine consumption |
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