CN105762822A - Grid-connected structure of compressed air energy storage system - Google Patents
Grid-connected structure of compressed air energy storage system Download PDFInfo
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- CN105762822A CN105762822A CN201610325688.XA CN201610325688A CN105762822A CN 105762822 A CN105762822 A CN 105762822A CN 201610325688 A CN201610325688 A CN 201610325688A CN 105762822 A CN105762822 A CN 105762822A
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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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- 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
- H02J15/00—Systems for storing electric energy
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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
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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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a grid-connected structure of a compressed air energy storage system. Electric energy of energy storage equipment is connected into an alternating-current network sequentially through a motor-side current transformer, a DC-DC converter and a grid-connected inverter. The grid-connected structure is characterized in that a motor-side outer ring controller is arranged to collect state information of a motor and the motor-side current transformer in real time, and then the motor revolving speed, the direct current-side voltage and the motor-end voltage of the motor-side current transformer are controlled sequentially through a motor-side inner ring controller and a motor-side PWM generator. By adopting the structure, it is guaranteed that the compressed air energy storage system is stable in load characteristic and high in conversion efficiency during energy storage and achieves scale electric energy storage when a power grid is at a load valley.
Description
Technical field
The present invention relates to compressed air energy storage technology field, particularly to the grid connected structure of a kind of compressed-air energy-storage system.
Background technology
Compressed-air energy storage (Compressedairenergystorage, CAES) adopts the form of pressure-air to carry out electric power storage.In thermal energy storage process, power driven compressor (or directly being driven by mechanical energy) compression air into storage is in air storage chamber；Exoergic process then discharges pressure-air expansion work, the external output power of drive electrical generators.
Compared with other energy storage technologies, the feature that compressed-air energy-storage system has small investment, operation and maintenance cost is low, dynamic response is fast, the method for operation is flexible, economic performance is high, environmental pollution is little, floor space is little, it is subject to the attention of various countries gradually.All there are compressed-air energy storage power station in the developed countries such as Germany, the U.S., Japan, Italy just in process of construction.China greatly develops compressed air energy storage technology in economy, and society and national security aspect have important strategic importance, and it can promote the fast development of China's intelligent grid related industry and Grand Equipments manufacturing technology.
But the scarcity in compressed-air energy storage rationale and experimental system research and deficiency at present, simultaneously existing compressed-air energy-storage system research still fails to break through the key technologies such as grid-connected, the further development of serious restriction compressed-air energy-storage system.
For upper problem, it is provided that a kind of novel grid connected structure, it is ensured that compressed-air energy-storage system part throttle characteristics when energy storage is stable, and conversion efficiency is high, and when electrical network is in load valley, it is achieved the large scale storage of electric energy.
Summary of the invention
The technical problem to be solved is to provide the grid connected structure of a kind of compressed-air energy-storage system, it is ensured that compressed-air energy-storage system part throttle characteristics when energy storage is stable, and conversion efficiency is high, and when electrical network is in load valley, it is achieved the large scale storage of electric energy.
For reaching above-mentioned purpose, the technical scheme is that, a kind of grid connected structure of compressed-air energy-storage system, pass sequentially through motor side current transformer including the electric energy of energy storage device, DC/DC changer, combining inverter are linked in AC network, it is characterised in that: described grid connected structure passes sequentially through ring controller and motor side PWM generator in motor side after being provided with the status information of the outer ring controller motor in real time of motor side and motor side current transformer and the motor speed of motor side current transformer, DC voltage, set end voltage is controlled；Described grid connected structure is provided with the voltage of voltage power computing unit Real-time Collection AC network and power and is transported to grid-connected outer ring controller and produces reference signal to grid-connected interior ring controller, and combining inverter is carried out electric current adjustment by grid-connected PWM generator by grid-connected interior ring controller；Described grid connected structure be provided with outer ring controller gather energy storage device voltage signal after parameter reference signal send in ring controller, DC/DC changer is carried out electric current adjustment by PWM generator by interior ring controller.
In described motor side, ring controller output reference signal is to the outer ring controller of motor side.
Described grid-connected interior ring controller gathers the current information of AC network.
The current information of described interior ring controller Real-time Collection energy storage device.
The grid connected structure of a kind of compressed-air energy-storage system, owing to adopting above-mentioned structure, present invention ensure that compressed-air energy-storage system part throttle characteristics when energy storage is stable, and conversion efficiency is high, and when electrical network is in load valley, it is achieved the large scale storage of electric energy.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation；
Fig. 1 is the connection diagram of the grid connected structure of a kind of compressed-air energy-storage system of the present invention；
Fig. 2 be a kind of compressed-air energy-storage system of the present invention grid connected structure in the connection diagram of motor side current transformer；
Fig. 3 be a kind of compressed-air energy-storage system of the present invention grid connected structure in the connection diagram of combining inverter；
Fig. 4 be a kind of compressed-air energy-storage system of the present invention grid connected structure in the connection diagram of DC/DC changer；
In figures 1-4,1, motor side current transformer；2, DC/DC changer；3, combining inverter；4, energy storage device；5, AC network；6, the outer ring controller of motor side；7, ring controller in motor side；8, motor side PWM generator；9, grid-connected outer ring controller；10, grid-connected interior ring controller；11, grid-connected PWM generator；12, outer ring controller；13, interior ring controller；14, PWM generator；15, voltage power computing unit.
Detailed description of the invention
AC type compressed-air energy-storage system mainly includes compressed-air energy-storage system and flywheel energy storage system.Both energy-storage systems all need to couple with motor, adopt alternating current generator more, therefore, both energy-storage systems are classified as AC type energy-storage system in power system is applied.The structure of the distributed energy storage system of AC type has similarity, is all absorbed by alternating current generator or send power；System is generally adopted high-revolving permagnetic synchronous motor, induction machine etc., it is necessary to after the AC rectification of high frequency and inversion, the alternating current becoming power frequency is grid-connected.
Couple with motor at a high speed owing to AC type energy-storage system is general, therefore require over that power electronic equipment is rectified and grid-connected after inversion, typical case's grid connected structure is made up of motor side current transformer and combining inverter, adding a DC/DC changer at motor side current transformer and combining inverter, Main Function is that motor side current transformer direct current exit potential is boosted simultaneously.
Specifically as Figure 1-4, the present invention includes that the electric energy of energy storage device 4 passes sequentially through motor side current transformer 1, DC/DC changer 2, combining inverter 3 are linked in AC network 5, it is characterised in that: described grid connected structure passes sequentially through ring controller 7 and motor side PWM generator 8 in motor side after being provided with the status information of outer ring controller 6 motor in real time of motor side and motor side current transformer 1 and the motor speed of motor side current transformer 1, DC voltage, set end voltage is controlled；Described grid connected structure is provided with the voltage of voltage power computing unit 15 Real-time Collection AC network 5 and power and is transported to grid-connected outer ring controller 9 and produces reference signal to grid-connected interior ring controller 10, and combining inverter 3 is carried out electric current adjustment by grid-connected PWM generator 11 by grid-connected interior ring controller 10；Described grid connected structure is provided with ring controller 13 in parameter reference signal after outer ring controller 12 gathers the voltage signal of energy storage device 4 is sent into, and DC/DC changer 2 is carried out electric current adjustment by PWM generator 14 by interior ring controller 13.
In motor side, ring controller 7 exports reference signal to the outer ring controller 6 of motor side.Grid-connected interior ring controller 10 gathers the current information of AC network 5.The current information of interior ring controller 13 Real-time Collection energy storage device 4.
Motor is mainly controlled by the control system of motor side current transformer 1, adopts permagnetic synchronous motor more, and only need to consider control when discharging in compressed-air energy-storage system.All in all, what type the motor no matter adopted in AC type energy-storage system is, is in which kind of mode of operation, and its motor side current transformer 1 all can adopt double-loop control structure.According to different control targets, the electric parameters such as motor speed, DC voltage, set end voltage can be controlled by the outer ring controller 6 of motor side, and obtains the reference signal of ring controller 7 in motor side；Internal ring is generally adopted PI controller and controls current of electric, and produces the modulation signal of current transformer.
Combining inverter 3 has polytype, according to the character of DC side power supply, it is possible to be divided into voltage source inverter and current source inverter；The number of phases according to output voltage, it is possible to be divided into single-phase inverter, three-phase inverter and polyphase inverter；It addition, also can by its output-voltage levels number, voltage waveform type, frequency, whether have isolation etc. to classify.The control structure of combining inverter 3 adopts double-loop control structure, and wherein grid-connected outer ring controller 9 is mainly used in embodying the different purpose that controls, and the current reference signal of generation internal ring, dynamic response is slower；Grid-connected interior ring controller 10 is substantially carried out electric current fine, quick and regulates, and dynamic response is very fast.
During energy-storage system application scenarios difference, its combining inverter 3 need to take different control strategies, and the difference of control strategy is mainly reflected in the outer shroud of inverter and controls.The outer loop control method of common energy storage combining inverter has: power limitation control (PQ control), constant voltage constant frequency control (V/f control), droop control (Droop control).The major function of power limitation control is that the meritorious and reactive power making inverter export follows value and power reference, its essence is and is respectively controlled after active power and reactive power decoupling.The function that constant voltage constant frequency controls is the power by adjusting inverter output, makes the alternating voltage amplitude at inverter outlet place and frequency remain unchanged, is generally used for the situation of micro-capacitance sensor independent operating.Droop control is a kind of control method of simulation generator set " merit frequency static characteristic ", make use of and inject the principle that the active power of AC network, reactive power are linear with voltage phase angle, amplitude respectively, droop control has method two kinds basic: by regulating electric voltage frequency and amplitude controls the power of output；By regulating power control voltage frequency and the amplitude of output.
Comparing inverter, what DC/DC changer 2 related in controlling is DC quantity, is not related to coordinate transform, by a relatively simple.The control of DC/DC changer 2 also more adopts twin nuclei, and outer ring controller 12 produces the reference signal of internal ring according to no control purpose, and interior ring controller 13 carries out quick electric current adjustment.
The present invention, with its good power supply characteristic having and part throttle characteristics, provides sharp weapon for realizing " source-net-He " overall process flexibility interaction.During as load energy storage, it is stable that compression air carries out part throttle characteristics during energy storage, conversion efficiency is high, especially wind-powered electricity generation, photoelectricity exert oneself big and when electrical network is in load valley, electric energy is carried out large scale storage, promoting the development of generation of electricity by new energy, avoiding abandoning wind, abandon the wastings of resources such as light there is positive effect；And at wind-powered electricity generation, photoelectricity without exerting oneself and when electrical network is in load peak, quickly response makes up power notch for electrical network, it is provided that electric energy continually and steadily, it is ensured that power network safety operation.
Above in conjunction with accompanying drawing, the present invention is exemplarily described; the obvious present invention implements and is not subject to the restrictions described above; as long as have employed the various improvement that technical solution of the present invention carries out, or not improved that directly apply to other occasion, all within protection scope of the present invention.
Claims (4)
1. the grid connected structure of a compressed-air energy-storage system, electric energy including energy storage device (4) passes sequentially through motor side current transformer (1), DC/DC changer (2), combining inverter (3) is linked in AC network (5), it is characterized in that: described grid connected structure is provided with outside motor side and passes sequentially through ring controller in motor side (7) and the motor side PWM generator (8) motor speed to motor side current transformer (1) after the status information of ring controller (6) motor in real time and motor side current transformer (1), DC voltage, set end voltage is controlled；Described grid connected structure is provided with the voltage of voltage power computing unit (15) Real-time Collection AC network (5) and power and is transported to grid-connected outer ring controller (9) and produces reference signal to grid-connected interior ring controller (10), and combining inverter (3) is carried out electric current adjustment by grid-connected PWM generator (11) by grid-connected interior ring controller (10)；Described grid connected structure be provided with outer ring controller (12) gather energy storage device (4) voltage signal after parameter reference signal send in ring controller (13), DC/DC changer (2) is carried out electric current adjustment by PWM generator (14) by interior ring controller (13).
2. the grid connected structure of a kind of compressed-air energy-storage system according to claim 1, it is characterised in that: in described motor side, ring controller (7) output reference signal is to the outer ring controller (6) of motor side.
3. the grid connected structure of a kind of compressed-air energy-storage system according to claim 1, it is characterised in that: described grid-connected interior ring controller (10) gathers the current information of AC network (5).
4. the grid connected structure of a kind of compressed-air energy-storage system according to claim 1, it is characterised in that: the current information of described interior ring controller (13) Real-time Collection energy storage device (4).
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| CN201610325688.XA CN105762822A (en) | 2016-05-17 | 2016-05-17 | Grid-connected structure of compressed air energy storage system |
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| CN201610325688.XA CN105762822A (en) | 2016-05-17 | 2016-05-17 | Grid-connected structure of compressed air energy storage system |
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Application publication date: 20160713 |
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