CN105656081A - Large-capacity new energy power generation system - Google Patents
Large-capacity new energy power generation system Download PDFInfo
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- CN105656081A CN105656081A CN201610120267.3A CN201610120267A CN105656081A CN 105656081 A CN105656081 A CN 105656081A CN 201610120267 A CN201610120267 A CN 201610120267A CN 105656081 A CN105656081 A CN 105656081A
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- 238000010248 power generation Methods 0.000 title claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 43
- 230000001360 synchronised effect Effects 0.000 claims abstract description 36
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000004146 energy storage Methods 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 45
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000026683 transduction Effects 0.000 description 1
- 238000010361 transduction Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a large-capacity new energy power generation system. The system comprises the three new energy power stations of a photovoltaic power station, a wind power station, an energy storage power station, direct current transmission lines and an energy conversion system; each new energy power station is connected to the energy conversion system through the corresponding direct current transmission line, a middle-high voltage converter, a middle-high voltage electric motor, a coupler and a synchronous generator serve as core devices of the energy conversion system, the positive pole of each direct current transmission line is connected with the positive pole of the middle-high voltage converter, the negative pole of each direct current transmission line is connected with the positive pole of the middle-high voltage converter, the middle-high voltage converter drives the middle-high voltage electric motor to run in a variable-frequency speed-regulation mode, the middle-high voltage electric motor is connected with the synchronous generator through the coupler to drive the synchronous generator to generate power, and conversion from a direct current to an alternating current is achieved. The three running modes of grid-connection power generation, grid-connection frequency regulation and isolated grid power supply are achieved.
Description
Technical field
The present invention relates to a kind of containing photovoltaic plant, wind power station, energy-accumulating power station new energy power station access, through DC power transmission line, the electricity generation system of energy conversion system being core apparatus with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator, specifically, particularly a kind of Large Copacity photovoltaic plant, wind power station, energy-accumulating power station adopt synchronous generator to generate electricity by way of merging two or more grid systems, the electricity generation system of grid-connected frequency modulation and lonely net power supply.
Background technology
The fossil energies such as coal, oil, natural gas have unsustainable property, utilize the problems such as the global warming, the ecological deterioration that produce to jeopardize human social in a large number, on the other hand, along with technological progress and cost of electricity-generating decline, solar energy, the renewable and clean energy resource generating scale continuous enlargement such as wind-power electricity generation, the ratio accounting for generated energy is increasing, but solar energy, wind-power electricity generation has randomness, intermittent, single photovoltaic combining inverter, wind energy converter is less by the restriction rated power of power electronic devices, more than 100MW Large Copacity photovoltaic plant, wind-force sends out station to be needed to use tens the even photovoltaic DC-to-AC converter of thousands of, wind energy converter, and photovoltaic DC-to-AC converter, wind energy converter concentrates grid-connected easy generation line voltage in a region, the power quality problem such as frequency fluctuation and harmonic wave, electrical network resonance is there is time serious, jeopardize electric power netting safe running, along with new forms of energy large-scale grid connection, add power system peak regulation difficulty, in the urgent need to supporting the friendly grid-connected generation technology of Large Copacity solar wind power station.
Conventional variable frequency power source response speed is slow, Ramp Rate is low, has not adapted to the demand that power system is fast-developing and new forms of energy access on a large scale; And energy storage frequency modulation has quickly accurate power tracking ability, more efficient than conventional variable frequency power source; But the key equipment energy storage inverter playing energy transduction at present between energy storage and electrical network is also affected by the restriction of power electric component, and the separate unit peak power of main flow is 500KW, limits the application of energy storage frequency modulation.
In a lot of islands and outlying district, there is no bulk power grid, rely on power supply cost height and the contaminated environment of diesel generation, or there are photovoltaic, wind-power electricity generation and batteries to store energy, and use the power generating equipment of inverter power supply, but the rated power of single inverter is limited and especially heavy-duty motor adaptability is poor to load.
Summary of the invention
In view of this, the invention provides a kind of photovoltaic plant, wind power station, energy-accumulating power station through DC transmission line access with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator be core apparatus the scheme of energy conversion system and embodiment, when described electricity generation system is used for generating electricity by way of merging two or more grid systems, the quality of power supply that raising Large Copacity photovoltaic plant, wind power station generate electricity by way of merging two or more grid systems;When described electricity generation system is for grid-connected frequency modulation, energy is response scheduling quickly, and Stored energy inverter has the advantage that rated power is big, expands the range of application of energy storage frequency modulation; When described electricity generation system is for orphan's net power supply, relative inverter has the rated power general adaptive capacity greatly and to load.
Medium-high voltage frequency converter is the rated voltage medium voltage frequency converter more than 1000V and high voltage converter, and medium-high voltage motor is the rated voltage middle voltage electromotor more than 1000V and high-tension motor.
It is different from traditional parallel network power generation, wind power grid-connected generating, this electricity generation system is first transported to energy conversion system the direct current energy of photovoltaic plant, wind power station output through DC power transmission line, carry out concentrating electric energy conversion and output at energy conversion system, isolate the impact on electrical network of the large number of power electronic equipment, improved the electrical network quality of power supply and ensure electric power netting safe running.
Energy-accumulating power station accesses energy conversion system through DC power transmission line.
Rated voltage between positive pole and the negative pole of DC power transmission line is more than 1500V.
The operation logic of energy conversion system is that DC power transmission line inputs medium-high voltage frequency converter the direct current energy of new energy power station, its positive pole connects medium-high voltage frequency converter positive pole, its negative pole connects medium-high voltage frequency converter negative pole, medium-high voltage frequency converter drives medium-high voltage motor frequency control to run, direct current energy is converted to mechanical energy, medium-high voltage motor is by shaft coupling and the generating of synchronous generator connecting belt engine alternator, it is AC energy changes mechanical energy, thus realizing the direct current energy conversion to AC energy.
This electricity generation system has 3 kinds of operational modes.
1st kind is generate electricity by way of merging two or more grid systems, and photovoltaic plant, wind power station input unstable power to DC power transmission line; For ensureing DC power transmission line stable operation, namely the input of DC power transmission line, output balance are first ensured, by controlling the voltage of the input power stable DC transmission line of electricity of medium-high voltage frequency converter in real time, its process is that medium-high voltage frequency converter drives medium-high voltage motor, regulate the torque of medium-high voltage motor in real time thus controlling the input power of medium-high voltage frequency converter in real time, by shaft coupling, energy being transferred to synchronous generator by medium-high voltage motor, synchronous generator is transported to electrical network electric energy again; Energy-accumulating power station is by charging from DC power transmission line absorbed power, by discharging to DC power transmission line input power, therefore, photovoltaic plant, wind power station output-power fluctuation can be smoothed by controlling the charging and discharging power of energy-accumulating power station in real time, further, it is capable of photovoltaic plant, delivers power to bulk power grid to wind power station schedulable by controlling the charging and discharging power of energy-accumulating power station in real time.
2nd kind is grid-connected frequency modulation, principle is change synchronous generator according to mains frequency to carry active power regulation mains frequency to electrical network, the torque being controlled medium-high voltage motor by medium-high voltage frequency converter in real time makes synchronous generator input active power to electrical network, for ensureing DC power transmission line stable operation, namely the input of DC power transmission line, output balance are first ensured, by controlling the voltage of the charging and discharging power stability DC power transmission line of energy-accumulating power station in real time.
3rd kind is lonely net power supply, this electricity generation system constitutes 1 isolated electrical network, first pass through the voltage of the charging and discharging power stability DC power transmission line controlling energy-accumulating power station in real time, the output of synchronous generator is determined by network load, make the load torque real-time change of medium-high voltage motor, the torque that medium-high voltage frequency converter regulates medium-high voltage motor in real time is needed to make medium-high voltage motor band engine alternator stable electric generation, major part photovoltaic, wind-power electricity generation is first stored in energy-accumulating power station, small part is immediately supplied load by synchronous generator, unstable photovoltaic, wind-power electricity generation needs output by the adjustment of energy storage according to load, realize photovoltaic, the utilization nearby of wind-power electricity generation.
Accompanying drawing explanation
Fig. 1 is the disclosed a kind of Large Copacity grid-connected power generation system schematic diagram of the invention process example.
Fig. 2 is the disclosed a kind of Large Copacity photovoltaic plant schematic diagram of the invention process example.
Fig. 3 is the disclosed a kind of Large Copacity wind power station schematic diagram of the invention process example.
Fig. 4 is the disclosed a kind of Large Copacity solar wind power station schematic diagram of the invention process example.
Fig. 5 is the invention process example disclosed a kind of Large Copacity energy storage frequency modulation power station schematic diagram.
Fig. 6 is the disclosed a kind of Large Copacity photovoltaic of the invention process example and energy-accumulating power station schematic diagram.
Fig. 7 is the disclosed a kind of Large Copacity wind-force of the invention process example and energy-accumulating power station schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the present invention is carried out clear, complete description, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on inventive embodiment, the every other embodiment that those skilled in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Referring to Fig. 1, the invention discloses a kind of Large Copacity grid-connected power generation system, the electric energy that photovoltaic plant, wind power station send is transported to energy conversion system through DC power transmission line, energy-accumulating power station passed through DC power transmission line and accessed energy conversion system, photovoltaic, wind-power electricity generation, with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator for core apparatus, are concentrated through synchronous generator and access electrical network by energy conversion system; This electricity generation system have generate electricity by way of merging two or more grid systems, grid-connected frequency modulation, lonely net 3 kinds of operational modes of power supply.
Referring to Fig. 2, a kind of Large Copacity photovoltaic plant embodiment for the present invention, photovoltaic generation is transported to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator for core apparatus, photovoltaic generation is concentrated through synchronous generator and accesses electrical network, improve grid stability and receive the ability of photovoltaic generation.
Referring to Fig. 3, a kind of Large Copacity wind power station embodiment for the present invention, wind-power electricity generation is transported to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, high-tension motor, shaft coupling and synchronous generator for core apparatus, wind-power electricity generation is concentrated through synchronous generator and accesses electrical network, improve grid stability and receive the ability of wind-power electricity generation.
Referring to Fig. 4, a kind of Large Copacity solar wind power station embodiment for invention, photovoltaic, wind-power electricity generation are transported to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, medium-high voltage motor, synchronous generator for core apparatus, photovoltaic, wind-power electricity generation are concentrated through synchronous generator and access electrical network, improves grid stability and receive the ability of photovoltaic, wind-power electricity generation.
Referring to Fig. 5, a kind of Large Copacity energy storage frequency modulation power station embodiment for the present invention, energy-accumulating power station is connected to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, medium-high voltage motor, synchronous generator is core apparatus, it is schedulable that synchronous generator is transported to the active power of electrical network, to realize frequency modulation function, medium-high voltage frequency converter is that input power can change along with dispatch command, for ensureing hvdc transmission line stable operation, namely the energy balance of high voltage dc bus is first ensured, the voltage of the charging and discharging power stability HVDC transmission line of energy-accumulating power station need to be controlled in real time.
Referring to Fig. 6, a kind of Large Copacity photovoltaic and energy-accumulating power station embodiment for the present invention, photovoltaic plant, energy-accumulating power station is connected to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator are core apparatus, by photovoltaic plant, energy-accumulating power station is concentrated through synchronous generator and accesses electrical network, this power station has 2 kinds of operational modes, one is to generate electricity by way of merging two or more grid systems, steady for unstable photovoltaic generation, it is transported to bulk power grid to schedulable, the second is lonely net power supply, by controlling the voltage of the charging and discharging power stability DC power transmission line of energy-accumulating power station in real time, the output of synchronous generator is determined by network load, realize photovoltaic generation to utilize nearby.
Referring to Fig. 7, a kind of Large Copacity wind-force and energy-accumulating power station embodiment for the present invention, wind power station, energy-accumulating power station is transported to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator are core apparatus, by wind power station, energy-accumulating power station is concentrated through synchronous generator and accesses electrical network, this power station has operation state mode in 2, one is to generate electricity by way of merging two or more grid systems, steady for unstable wind-power electricity generation, it is transported to bulk power grid to schedulable, the second is lonely net power supply, by controlling the voltage of the charging and discharging power stability DC power transmission line of energy-accumulating power station in real time, the output of synchronous generator is determined by network load, realize wind-power electricity generation to utilize nearby.
Referring to Fig. 1, a kind of Large Copacity photovoltaic for the present invention, wind-force and energy-accumulating power station embodiment, photovoltaic plant, wind power station and energy-accumulating power station are transported to energy conversion system through DC power transmission line, energy conversion system is with medium-high voltage frequency converter, medium-high voltage motor, shaft coupling and synchronous generator are core apparatus, by photovoltaic plant, wind power station, energy-accumulating power station is concentrated through synchronous generator and accesses electrical network, this power station has operational mode in 2, one is to generate electricity by way of merging two or more grid systems, unstable photovoltaic, wind-power electricity generation is steady, it is transported to bulk power grid to schedulable, the second is lonely net power supply, by controlling the voltage of the charging and discharging power stability DC power transmission line of energy-accumulating power station in real time, the output of synchronous generator is determined by network load, realize photovoltaic, wind-power electricity generation utilizes nearby.
Claims (2)
1. a Large Copacity grid-connected power generation system, it is characterised in that including:
This electricity generation system is containing photovoltaic plant, wind power station, 3 kinds of new energy power station of energy-accumulating power station, DC power transmission line and energy conversion system;
Photovoltaic plant, wind power station DC power output are transported to energy conversion system through DC power transmission line;
Energy-accumulating power station accesses energy conversion system through DC power transmission line;
Rated voltage between DC power transmission line positive pole, negative pole is more than 1500V;
Energy conversion system is with medium-high voltage frequency converter, mesohigh motor, shaft coupling and synchronous generator for core apparatus, the positive pole of DC power transmission line connects medium-high voltage frequency converter positive pole, DC power transmission line negative pole connects medium-high voltage frequency converter negative pole, medium-high voltage frequency converter drives medium-high voltage motor frequency control to run, medium-high voltage motor is by the generating of shaft coupling and synchronous generator connecting belt engine alternator, it is achieved unidirectional current is to the conversion of alternating current;
Medium-high voltage frequency converter is the rated voltage medium voltage frequency converter more than 1000V and high voltage converter, and medium-high voltage motor is the rated voltage middle voltage electromotor more than 1000V and high-tension motor.
2. electricity generation system according to claim 1, it is characterised in that:
This electricity generation system has 3 kinds of operational modes:
1st kind is generate electricity by way of merging two or more grid systems, voltage by medium-high voltage frequency converter stable DC transmission line of electricity, by controlling the charging and discharging power smooth photovoltaic plant of energy-accumulating power station, wind power station output-power fluctuation in real time, unstable photovoltaic, wind-power electricity generation is steady, be transported to bulk power grid to schedulable;
2nd kind is grid-connected frequency modulation, and by the voltage of energy-accumulating power station stable DC transmission line of electricity, the torque being controlled medium-high voltage motor by medium-high voltage frequency converter in real time makes synchronous generator carry active power to regulate mains frequency to electrical network;
3rd kind is lonely net power supply, this electricity generation system constitutes 1 isolated electrical network, voltage by energy-accumulating power station stable DC transmission line of electricity, the torque being controlled medium-high voltage motor by medium-high voltage frequency converter in real time makes synchronous generator stable operation under different loads, and unstable photovoltaic, wind-power electricity generation are exported according to workload demand by the adjustment of energy storage.
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| CN201610120267.3A CN105656081A (en) | 2016-03-03 | 2016-03-03 | Large-capacity new energy power generation system |
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| CN201610120267.3A CN105656081A (en) | 2016-03-03 | 2016-03-03 | Large-capacity new energy power generation system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106786787A (en) * | 2017-02-14 | 2017-05-31 | 北京清能世福科技有限公司 | A kind of grid-connected Large Copacity energy-accumulating power station of synchronized motor |
| CN110445182A (en) * | 2019-09-06 | 2019-11-12 | 集美大学 | Wind mobile platform wind-light storage direct current power system and control method are surveyed in a kind of highly reliable floatation type sea |
| CN112886631A (en) * | 2020-02-29 | 2021-06-01 | 贵州电网有限责任公司 | MGP new energy grid-connected control method and system |
| CN114204600A (en) * | 2021-12-15 | 2022-03-18 | 山东大学 | An AC self-synchronizing wind power generation system and its working method |
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| CN112886631A (en) * | 2020-02-29 | 2021-06-01 | 贵州电网有限责任公司 | MGP new energy grid-connected control method and system |
| CN112886631B (en) * | 2020-02-29 | 2023-11-10 | 贵州电网有限责任公司 | MGP new energy grid-connected control method and system |
| CN114204600A (en) * | 2021-12-15 | 2022-03-18 | 山东大学 | An AC self-synchronizing wind power generation system and its working method |
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