CN104868498A - Topological structure for wind-solar integrated large-power grid-connected converter system - Google Patents
Topological structure for wind-solar integrated large-power grid-connected converter system Download PDFInfo
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Classifications
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- H02J3/385—
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention relates to the field of wind-solar complementation, and discloses a circuit topological structure integrating wind power generation and photovoltaic power generation. The structure comprises a machine side converter, a grid side converter, and a photovoltaic Boost voltage booster, wherein the machine side converter, the grid side converter and the photovoltaic Boost voltage booster are in parallel connection at a DC bus part. A system enables the wind power generation and photovoltaic power generation to be combined at a grid-connected converter part, thereby achieving independent operation and parallel operation, weakening the adverse impact on grid connection from intermittent interferences, improving the operation reliability of the whole system, and adapting to the combination of a large-power wind power converter and a photovoltaic inverter. Meanwhile, the structure can save a set of photovoltaic grid-connected inverter, a set of grid-connected transformer, and a high-voltage grid-connected switch, thereby achieving the wind power and photovoltaic integration at the grid-connected converter part and other subsequent parts. The wind-power machine side converter, the grid side converter and the photovoltaic Boost voltage booster can form a body, can be cooled completely through water cooling, and are disposed in a wind power tower, thereby reducing the size and reducing the cost of equipment.
Description
Technical field
The present invention relates to wind light mutual complementing field, the circuit structure scheme that particularly wind power generation is integrated with photovoltaic generation.
Background technology
Along with the change of world energy sources general layout, photovoltaic generation and wind power generation become the focus that various countries further investigate, greatly develop day by day.China is vast in territory, honourable aboundresources, successively establishes large quantities of wind energy turbine set, photovoltaic plant.In view of regional difference, wind energy turbine set and the photovoltaic plant independent operating of wind energy and luminous energy.But all there is intermittent feature due to wind energy and solar energy, also all there is the shortcoming of energy instability in independent wind generator system and independent solar electricity generation system.Overcast and rainy or night, the generating efficiency of solar cell is very low or do not generate electricity, and now may wind speed very large, be more conducive to wind power generation; Time bright and sunny, be more conducive to photovoltaic generation, therefore there is complementarity to a certain degree in honourable two spike-type cultivars; Given this, the comprehensive utilization of wind energy, solar energy is subject to the most attention of various countries, wind light mutual complementing power generation problem study by scholar.The application of wind and solar hybrid generating system, just at present, many conducts are small-power electric power system independently, for the area away from electrical network, as the work station etc. of the signal station of the relay station of the frontier sentry of army, post and telecommunications, highway and railway, geological prospecting and field study.
Current wind and solar hybrid generating system mostly is the low capacity system of special-purpose, inverter is from network operation, generally that the direct current of variable voltage variable frequency AC rectification that the direct current that exported by solar panel and wind energy conversion system export is stored in batteries by controller, when user needs electricity consumption, inverter changes the direct current stored in batteries into alternating current, delivers to user load place by transmission line.Wind light mutual complementing power generation station system forms an electricity generation system, by grid-connected for electric power feeding normal grid primarily of wind-driven generator, solar cell array, intelligent controller, batteries, Multifunctional inverter, cable and support and auxiliary member etc.This low capacity wind and solar hybrid generating system also can be described as off-grid type wind and optical energy integrated power generation system.
The many Gobi deserf in NORTHWEST CHINA portion, the north and grassland, many wilderness, northeast, physical features is compared smooth, honourable aboundresources but meagrely-populated.Large-sized photovoltaic power station and wind energy turbine set compare occupation of land side, photovoltaic plant installed capacity as 10MW takes up an area about 300 mu, the wind energy turbine set (in single-machine capacity 1.5MW) of 49.5MW is taken up an area and is about 150 mu, if be blower fan above, be photovoltaic battery panel below, the two ground on the scene is combined, then on 150 mu of same soils, may build out the wind light generation field more than 49.5MW, therefore barren beach Gobi desert, grassland, wilderness become the suitable factory site building large-scale ground photovoltaic plant, wind energy turbine set.Some special area, because of military base, wasteland irrigate, outlying without electric user and some other reasonses, photovoltaic plant and wind energy turbine set is needed to gather together, realize making full use of of limited resources space, reduce one-time investment, be convenient to integrated maintenance, management, reduce the adverse effect that view energy source intermittence is brought.
Wind energy turbine set and photovoltaic plant capacity are comparatively large, are all independent operating substantially at present, realize grid-connected separately, and space length are far away each other.For giving full play to the complementary advantage of wind, light resources, realize the Appropriate application in ground and high-altitude, improve facility, utilization rate of equipment and installations, improve single power supply power supply quality and reliability, Countries demonstrative project have employed wind and solar hybrid generating system, serves positive role to guarantee power network safety operation, and compensate for photovoltaic plant to exert oneself night be zero defect, exert oneself to play to power plants generating electricity and good smoothly turn use into, make it more close with the load index accessing electrical network.Current Large Copacity parallel net type wind and solar hybrid generating system, adopts AC (10kV or 35kV or 110kV) parallel connection to enter current collection station more, and EMS gathers voltage and current signal, user power situation, realizes the unified allocation of resources of wind-powered electricity generation and photoelectricity.
Present main flow directly drive or double-fed fan motor mostly is the low-pressure system of 660V or 690V, direct voltage is generally about 1050V and does not change under normal circumstances, and usual capacity is at 2.5MW and following; Power station type photovoltaic DC-to-AC converter capacity is generally 500kW, and output voltage is that 270V or 315V or 400V(America and Europe are in the majority), bus MPPT voltage is 450V-900V(270V system) or 500V-900V(315V system), busbar voltage fluctuation during MPPT.Wind-powered electricity generation and photovoltaic export constant voltage constant frequency three-phase alternating current after net side converter, are 10kV(or 35kV or 110kV by respective rear class transformer boost), unification is incorporated to middle pressure bus and delivers to current collection station, and typical system topological is as shown in Figure 1.
Affect by energy distribution character, traditional wind energy turbine set and photovoltaic plant, space length is comparatively far away each other, is difficult to realize United Dispatching in system, is incorporated to bulk power grid after can only boosting separately, constrains the flexibility of distributed energy scheduling.At some specific national Demonstration Bases, wind energy turbine set and photovoltaic plant close together or unite two into one, from overall bulk power grid angle, the middle pressure achieving wind-powered electricity generation and photovoltaic is grid-connected, United Dispatching, give full play to the complementary advantage of wind, light resources, but still do not walk out the shade that traditional independence is grid-connected, with regard to respective convertor assembly and front stage configuration thereof, with the independent synchronizing mode of tradition not without consistent.
Summary of the invention
For realizing the flexible United Dispatching of distributed wind, solar energy electricity generation grid-connecting, the invention provides a kind of novel photovoltaic wind integrated circuit topological structure, giving full play to the complementary advantage of wind, light resources.
The present invention adopts following technical scheme:
A kind of wind and optical energy integrated high-power grid-connected converter system topology, comprise a pusher side current transformer and a net side converter, characterized by further comprising a photovoltaic Boost stepup transformer, described pusher side current transformer, photovoltaic Boost stepup transformer and net side converter are in parallel at DC bus sections;
Described pusher side current transformer is made up of at least one commutating circuit, becomes DC bus-bar voltage for the AC rectification exported by wind-driven generator;
Described photovoltaic Boost stepup transformer is made up of, for the dc voltage boost that exported by photovoltaic array to DC bus-bar voltage at least one boosting loop;
Described net side converter is made up of at least one inversion circuit, exports for DC bus-bar voltage being reverse into alternating current.
Beneficial effect of the present invention:
A. photovoltaic generation and wind power generation integrated design is realized, pusher side current transformer, Boost stepup transformer and net side converter are in parallel by DC bus, both can wind-powered electricity generation or photovoltaic independent operating, also can parallel running, wind-powered electricity generation (or photovoltaic) is only affected grid-connected during pusher side (or stepup transformer side) fault, and trouble-free stepup transformer side (or pusher side) and net side are not almost affected, can be normally grid-connected, improve the serious forgiveness of system;
B. be incorporated to wind electric converter DC bus after photovoltaic busbar voltage being boosted, saved the quantity of photovoltaic DC-to-AC converter and rear class step-up transformer and the grid-connected switch of high pressure etc., reduce the input cost in device requirement and power station;
C. achieve the mutual supplement with each other's advantages of wind-powered electricity generation and photoelectricity, reduce the adverse effect that view energy source intermittence is brought to the full extent, eliminate photovoltaic side energy storage device, space, power station is fully used, and achieves the United Dispatching of distributed energy electricity generation grid-connecting;
D. pusher side current transformer, photovoltaic Boost stepup transformer and net side converter can concentrate placement according to power station actual conditions, also can split, and save volume and equipment, flexibly and easily;
E., when bulk power grid is not accessed in power station, photovoltaic battery panel provides DC power supply there being the daytime at sunshine, and the debugging efforts for unit provides more facility, can shorten grid-connected before debugging cycle, for more income is created in power station;
F. power station later stage upgrading is beneficial to, for the laying of " ice-melt " function system and the expansion of work increasing blade or power network line provides favourable conditions;
G. when net side converter adopts two-way or multichannel inversion circuit composition, increase inversion capacity, and the loop of upper and lower two groups of parallel connections can redundancy each other, time breaking down in a loop, does not affect other loops and normally runs;
H. during grid-connected transformer employing three-winding transformer, net side converter connects two low pressure windings on former limit respectively after filter, Parallel opertation after electromagnetic isolation, thus decreases net side converter quantity directly in parallel, reduces circulation.
Accompanying drawing explanation
Fig. 1 presses grid-connected system topological diagram in traditional wind-powered electricity generation photovoltaic.
Fig. 2 is Novel photovoltaic wind-powered electricity generation integral system of the present invention topology.
Fig. 3 is simplex winding blower fan pusher side rectification topology.
Fig. 4 is double winding blower fan pusher side rectification topology.
Fig. 5 is traditional single stage Boost circuit.
Fig. 6 is three level Boost circuit.
Fig. 7 is modified model twin-stage Boost circuit.
Fig. 8 is double wrap networking side converter topology.
Fig. 9 three winding net side converter topology.
Figure 10 LC filter (the star-like connection of electric capacity).
Figure 11 is LCL filter (the star-like connection of electric capacity).
Figure 12 is LC filter (electric capacity Angle connection).
Figure 13 is LCL filter (electric capacity Angle connection).
Figure 14 is three-winding transformer version 1.
Figure 15 is three-winding transformer version 2.
Embodiment
Below in conjunction with specific embodiment, the present invention is further detailed.
Fig. 2 is the system principle diagram of technical solution of the present invention, primarily of three part controllable current transformer compositions, comprise pusher side current transformer (being also rectifier), photovoltaic Boost stepup transformer and net side converter (being also inverter), three is at system dc bus part in parallel.
The variable voltage variable frequency AC rectification that blower fan exports by pusher side current transformer becomes unipolarity direct voltage Ud(Ud to be DC bus-bar voltage) be fed to DC bus, wind-driven generator can be low speed or high speed direct wind-driven generator, or be the permanent magnetism of tandem or the use of non-tandem or electric excitation direct driving wind driven generator, motor form can adopt simplex winding motor (as shown in Figure 3) or double-winding motor (as shown in Figure 4), according to different motor occupation modes, rectifier can have corresponding single loop, double loop or multiloop (three tunnels and three tunnels more than), the direct current output-parallel of all commutating circuits together.
Photovoltaic Boost stepup transformer comprises at least one boosting loop, and the dc voltage boost exported by photovoltaic array is fed to DC bus to Ud and realizes photovoltaic array MPPT function.Actual conditions according to power station can select different stepup transformers, as traditional single-stage Boost circuit (as shown in Figure 5), three level Boost circuit (as shown in Figure 6) or modified model twin-stage Boost circuit (as shown in Figure 7).
Net side converter comprises at least one inversion circuit, for stable DC busbar voltage, and is the alternating current of constant voltage constant frequency by direct current energy inversion.The outlet side of net side converter connects grid-connected transformer, and the alternating current that inversion obtains to 10kV or 35kV or 110kV etc. by grid-connected transformer boost, to adapt to grid requirements, and is fed to middle pressure bus, then delivers to current collection station.According to the difference of power grade, grid-connected transformer can select two winding transformer or three-winding transformer (as shown in Figure 8 and Figure 9).When the grid-connected transformer of employing three winding, net side converter is made up of two independent inversion circuits, and the direct current input of two inversion circuits is connected in parallel, upper and lower two loop redundancies each other, the two-way three-phase alternating voltage of two independent inversion circuit outputs connects two low pressure windings of the grid-connected transformer primary side of three winding respectively, as shown in Figure 14 and Figure 15, transformer can adopt Y, Y, the d mode of connection, also D can be adopted, D, the y mode of connection.
In various topographical form, inversion exports the conceptual design of Three-phase electric-wave filter as shown in Figure 10-Figure 13, and this filter can adopt the filtering of LC structure, also can adopt the filtering of LCL structure, in two kinds of filter circuit constructions, electric capacity C can angle-style connect or star-like connection.
Integrated converter can adopt concentrated placement schemes, making an entirety by pusher side current transformer, Boost stepup transformer and net side converter concentrates in a cupboard or multiple cabinet carries out and cabinet, whole water cooling, be placed in wind-power tower, thus saving volume, save a photovoltaic DC-to-AC converter room or container.So not only be convenient to concentrated heat dissipation design, decrease connector (or cable) each other.Also separation scheme can be adopted, pusher side current transformer is placed in wind column overhead, net side inverter is placed at the bottom of tower, photovoltaic Boost stepup transformer is placed near header box (DC cabinet) or is installed together with net side inverter, DC bus is utilized to carry out power delivery, the transmission of middle long distance DC bus, the topological structure of similar HVDC Light, thus the ac cable length of more effective saving generator side, reduce the overvoltage possibility that causes because of voltage reflection, reduce the electric cable heating phenomenon that the kelvin effect because of high-frequency ac current causes.
Wind power generation combines in combining inverter part with photovoltaic generation by system, can independent operating, also can parallel running, weaken intermittent interference to the grid-connected adverse effect brought, strengthen whole system reliability of operation, be applicable to the combination of high-power wind power converter and photovoltaic DC-to-AC converter; Can save simultaneously a set of photovoltaic combining inverter, a set of grid-connected transformer and and the equipment such as the grid-connected switch of high pressure, thus realize wind-powered electricity generation and integrated photovoltaic runs in follow-up equipment parts such as grid-connected converters.When wind-powered electricity generation pusher side breaks down, pusher side current transformer locking pulse, Boost stepup transformer and net side converter normally run; When breaking down in photovoltaic side, Boost stepup transformer locking pulse, pusher side and net side converter still normally run; When net side converter breaks down, pusher side current transformer, Boost stepup transformer and the equal locking pulse of net side converter, stop sending electric energy to electrical network, if net side converter has a more than loop and the problems such as non-shorting, insulation breakdown, only can block fault loop, improve utilization rate of equipment and installations.
Claims (9)
1. a wind and optical energy integrated high-power grid-connected converter system topology, comprise a pusher side current transformer and a net side converter, characterized by further comprising a photovoltaic Boost stepup transformer, described pusher side current transformer, photovoltaic Boost stepup transformer and net side converter are in parallel at DC bus sections;
Described pusher side current transformer is made up of at least one commutating circuit, becomes DC bus-bar voltage for the AC rectification exported by wind-driven generator;
Described photovoltaic Boost stepup transformer is made up of, for the dc voltage boost that exported by photovoltaic array to DC bus-bar voltage at least one boosting loop;
Described net side converter is made up of at least one inversion circuit, exports for DC bus-bar voltage being reverse into alternating current.
2. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, it is characterized in that pusher side current transformer is made up of at least two independent commutating circuits, the direct current output-parallel of all commutating circuits together.
3. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, is characterized in that net side converter is made up of at least two independent inversion circuits, and the direct current input of all inversion circuits is connected in parallel.
4. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, it is characterized in that described net side converter is made up of the independent inversion circuit of two redundancies each other, the output of two independent inversion circuits connects two low pressure windings of the grid-connected transformer primary side of three winding respectively.
5. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, is characterized in that described photovoltaic Boost stepup transformer adopts traditional single stage Boost circuit, modified model twin-stage Boost circuit or three level Boost circuit.
6. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, is characterized in that described commutating circuit, boosting loop, inversion circuit are controlled loop.
7. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, is characterized in that described pusher side current transformer and the arbitrary independent operating of photovoltaic Boost stepup transformer or both parallel runnings.
8. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, is characterized in that described pusher side current transformer, photovoltaic Boost stepup transformer and net side converter become one and is arranged in wind tower cylinder.
9. wind and optical energy integrated high-power grid-connected converter system topology as claimed in claim 1, it is characterized in that described pusher side current transformer is placed in wind column overhead, net side converter is placed at the bottom of Feng Tata, and photovoltaic Boost stepup transformer is placed near header box or is installed together with net side converter.
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| CN105680771A (en) * | 2016-03-25 | 2016-06-15 | 南通大学 | Wind-solar complementary generation system and control method |
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| CN110768300A (en) * | 2019-12-11 | 2020-02-07 | 阳光电源股份有限公司 | Wind-solar hybrid power generation system |
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