CN101567564B - Voltage and power regulator based on the composite energy storage of storage battery and super capacitor - Google Patents
Voltage and power regulator based on the composite energy storage of storage battery and super capacitor Download PDFInfo
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- CN101567564B CN101567564B CN2009100624555A CN200910062455A CN101567564B CN 101567564 B CN101567564 B CN 101567564B CN 2009100624555 A CN2009100624555 A CN 2009100624555A CN 200910062455 A CN200910062455 A CN 200910062455A CN 101567564 B CN101567564 B CN 101567564B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention discloses a voltage and power regulator based on the composite energy storage of a storage battery and a super capacitor. The regulator comprises an energy storage module, an electricity-electron transformation module and a transformer; the energy storage module comprises a plurality of composite energy storage units and the electricity-electron transformation module comprises a plurality of electricity-electron transformers; all the composite energy storage units are connected at the direct current bus side of the electricity-electron transformers in parallel and the alternatingcurrent side of each electricity-electron transformer is connected with the auxiliary-side winding of a voltage transformer correspondingly while the original-side winding thereof is connected into a power network. When in normal operation, the regulator can provide reactive power compensation for the power network to effectively stabilize the active power fluctuation; when failure or switching l oad transmission operation occurs in the power supply line, the regulator provides short-time power supply for load so as to avoid load power supply interruption and further rapidly traces the voltagemagnitude and phase of spare lines, thereby realizing that no impact is made in a spare power circuit.
Description
Technical field
The present invention relates to a kind of voltage and power regulator that adopts storage battery and ultracapacitor composite energy storage, belong to electrical equipment technical field.
Background technology
The large scale industry user generally has dual power supply.During operate as normal, loop line road power supply, another time is as standby.When supply line need overhaul or supply line is when breaking down, first tripping supply line drops into extension wire automatically by the prepared auto restart control device again.At this moment, user side has power failure (being generally several seconds) in short-term.And this power failure of several seconds for the large scale industry user, can cause enormous economic loss.Why not dropping into extension wire earlier when loading, is that the cyclization operation can produce impulse current, influences the safe operation of electrical network because may have the loop electromotive force between supply line and the extension wire this moment.
The harm of reply power failure, traditional improvement measure is to adopt the stand-by power supply of uninterrupted power supply (ups) Unity as load, but power quality problems such as the voltage fluctuation that this method just often all can not take place distribution in system's power supply, flickering carry out real-time reactive power compensation.
In order to tackle power quality problem, generally adopt STATCOM (STATCOM).STATCOM is based on the full-control type voltage source converter, it is idle to control output by adjusting current transformer output voltage, has the idle and capacitive reactive power bidirectional modulation function of output perception, can improve the line power factor, and can reach the purpose of effective inhibition voltage fluctuation and flickering, improve the quality of power supply of distribution.But the little electric capacity of STATCOM DC side parallel, capacity is very little, can only satisfy the meritorious consumption of STATCOM, so can only exchange reactive power in two quadrants between STATCOM and the electrical network, can not exchange active power with electrical network.
Summary of the invention
The object of the present invention is to provide a kind of voltage and power regulator based on storage battery and ultracapacitor composite energy storage, it provides reactive power compensation for electrical network when normally moving, and effectively stabilizes the active power fluctuation of load; When supply line breaks down or when falling the load operation, it provides in short-term supply of electric power avoiding the power failure of loading for load, and follows the tracks of the voltage magnitude and the phase place of extension wire fast, realizes not having impacting and drops into the stand-by power supply circuit.
Based on the voltage and power regulator of storage battery and ultracapacitor composite energy storage, comprise energy-storage module 3, Technics of Power Electronic Conversion module 4 and transformer T2; Described energy-storage module 3 is made of M composite energy storage unit 5, and Technics of Power Electronic Conversion module 4 is made of N converters 6, M 〉=1, N 〉=1; Composite energy storage unit 5 all is connected in parallel on the dc bus side of converters 6, and secondary side's winding of the AC side of each converters 6 and transformer T2 connects one to one, and former side's winding of transformer T2 inserts electrical network.
The output voltage of the secondary side's winding of each of described transformer T2 has phase angle difference.
Technique effect of the present invention is embodied in:
(1) the present invention can be meritorious and idle at four quadrants and electrical network exchange.Use the voltage and power regulator of energy storage device when electrical network normally moves, both to have the function of STATCOM (STATCOM), promptly improve power factor of electric network, suppress harmonic wave, suppress voltage fluctuation and flickering, improve the quality of power supply, have again and stabilize the function of the meritorious fluctuation of load the influence of electrical network.When system's generation power failure, the discharge by control composite energy storage unit continues to provide electric energy to load in short-term, and follows the tracks of the voltage magnitude and the phase angle of stand-by power supply circuit fast, realizes the level and smooth input of stand-by power supply, has improved power supply reliability.
(2) composite energy storage of storage battery and ultracapacitor formation is realized both mutual supplement with each other's advantages.The advantage of storage battery is that cost is lower, uses simply, and energy density is big.But storage battery is because the restriction of self charging and discharging currents, and its power density that discharges and recharges is lower, and battery cycle life is short, is not suitable for frequently discharging and recharging.It is big that ultracapacitor then has power density, has extended cycle life, and safeguards simple advantage, is suitable for the occasion that needs frequently discharge and recharge fast.But, can not provide the electric power of long period to load because the energy density of ultracapacitor is lower.Therefore, the composite energy storage that adopts storage battery and ultracapacitor to constitute can remedy the other side's shortcoming mutually, and have both advantages concurrently.The composite energy storage that storage battery and ultracapacitor constitute, it is big to have energy density, and power density is big, and the speed that discharges and recharges is fast, has extended cycle life the efficiency for charge-discharge advantages of higher.
(3) cost performance height: because storage battery and ultracapacitor belong to static energy-storage travelling wave tube, thereby simple and reliable when mixing use, operating cost is low, and maintenance cost is few, need not auxiliary equipment.During mixed energy storage system work, instantaneous large-current is mainly born by ultracapacitor, can effectively reduce the charging and discharging of accumulator cycle-index, prolongs the useful life of a whole set of energy-storage system, can also dwindle the volume of energy storage device, improve the reliability and the economy of electric power system.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 inserts a kind of access way of power distribution network for the present invention;
Fig. 3 inserts the another kind of access way of power distribution network for the present invention;
Fig. 4 is first kind of structural representation of composite energy storage of the present invention unit;
Fig. 5 is second kind of structural representation of composite energy storage of the present invention unit;
Fig. 6 is the third structural representation of composite energy storage of the present invention unit;
Fig. 7 is the structural representation of converters of the present invention.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing and example.
Fig. 1 is an overall structure schematic diagram of the present invention, and energy-storage module 3 is connected in parallel on the dc bus side of Technics of Power Electronic Conversion module 4, and the AC side of Technics of Power Electronic Conversion module 4 connects the low-pressure side of transformer T2, and electrical network is inserted in the high-pressure side of transformer T2.Energy-storage module 3 is made of M composite energy storage unit 5.Technics of Power Electronic Conversion module 4 adopts multiple technology, is made of N converters 6.The number N of the number M of composite energy storage unit 5 and converters 6 determines according to the user side load capacity.Transformer T2 adopts misphase position technology, and the mode of connection that suitably designs secondary side's winding differs output voltage each other
Phase place, for example, when N=4, each winding phase place is followed successively by 22.5 °, 7.5 ° ,-7.5 ° ,-22.5 °, the fractional harmonic of generation is cancelled out each other, thereby effectively reduces the harmonic wave that converters produces, and improves the system harmonics characteristic.
During work, the high-pressure side of transformer T2 connects the low-pressure side of power distribution network transformer T1, as shown in Figure 2, also the high-pressure side of transformer T2 can be connected the high-pressure side of transformer T1, as shown in Figure 3.
Fig. 4 is first kind of structural representation of composite energy storage unit 5.Ultracapacitor 8 connects an end of a DC/DC translation circuit 9, the other end of the one DC/DC translation circuit 9 is in parallel with storage battery 7 and the 2nd DC/DC translation circuit 10 respectively, and the 2nd DC/DC translation circuit 10 is connected in parallel on the dc bus side of Technics of Power Electronic Conversion module 4.During work, the terminal voltage of ultracapacitor 8 is consistent through the conversion of a DC/DC translation circuit 9 and the terminal voltage of storage battery 7, the 2nd DC/DC translation circuit 10 controls discharging and recharging storage battery 7 and ultracapacitor 8.
Fig. 5 is the another kind of structural representation of composite energy storage unit 5.Storage battery 7 connects an end of a DC/DC translation circuit 9, the other end of the one DC/DC translation circuit 9 is in parallel with ultracapacitor 8 and the 2nd DC/DC translation circuit 10 respectively, and the 2nd DC/DC translation circuit 10 is connected in parallel on the dc bus side of Technics of Power Electronic Conversion module 4.During work, the terminal voltage of storage battery 7 is consistent through the conversion of a DC/DC translation circuit 9 and the terminal voltage of ultracapacitor, the 2nd DC/DC translation circuit 10 controls discharging and recharging storage battery 7 and ultracapacitor 8.
Fig. 6 is the third structural representation of composite energy storage unit 5, and storage battery 7 connects a DC/DC translation circuit 9, and ultracapacitor 8 connects the dc bus side that 10, two DC/DC translation circuits of the 2nd DC/DC translation circuit all are connected in parallel on converters.During work, a DC/DC translation circuit 9 is discharging and recharging of control storage battery 7 separately, and the 2nd DC/DC translation circuit 10 is discharging and recharging of control ultracapacitor 8 separately.
Fig. 7 is the structural representation of converters, adopts voltage-type three-phase bridge full-control type converter, and electric capacity of its DC side parallel provides current transformer required meritorious consumption, and its AC side is connected to the low-pressure side of transformer T2 by inductance.
Operation principle of the present invention is as follows:
1, provides reactive power compensation for electrical network
Voltage fluctuation and flickering take place, in the time of need providing reactive power compensation, do not work in composite energy storage unit 5, by adjusting to Technics of Power Electronic Conversion module 4 output voltages, make 4 absorptions of Technics of Power Electronic Conversion module or send the dynamic passive compensation that the reactive current that meets the demands realizes power distribution network, suppress voltage fluctuation and flickering.
2, the power fluctuation that suppresses load side
Load side generation power fluctuation can utilize the fast charging and discharging characteristic of ultracapacitor 8, provides fast active power to regulate to load.Some load can bring the energy feedback to system under the particular job mode, as elevator in the process that descends, machine operation is at generating state, just have the part electric energy and feed back to electrical network, at this moment control ultracapacitor and absorb this part electric energy, can reduce the power fluctuation of grid side.
3, realize the free of discontinuities power supply
With structure shown in Figure 2 is example, and when distribution system current supply circuit 1 breaks down when maybe needing to overhaul, tripping supply line 1 drops into extension wire 2, and before, this a power failure will occur.3 discharges of control energy-storage module are through 4 inversions of Technics of Power Electronic Conversion module, for load provides electric power in short-term (general several seconds～tens seconds).When dropping into extension wire 2, control system is regulated the output voltage amplitude and the phase angle of Technics of Power Electronic Conversion module 4, follows the tracks of the voltage magnitude and the phase angle of stand-by circuit 2 fast, realizes taking over seamlessly of stand-by circuit 2, realize not having impacting and drop into extension wire, improve the fail safe and the reliability of electric power system.
Claims (4)
1. based on the voltage and power regulator of storage battery and ultracapacitor composite energy storage, comprise energy-storage module (3), Technics of Power Electronic Conversion module (4) and transformer (T2); Described energy-storage module (3) is made of M composite energy storage unit (5), and Technics of Power Electronic Conversion module (4) is made of N converters (6), M 〉=1, N＞1; Composite energy storage unit (5) all is connected in parallel on the dc bus side of converters (6), and secondary side's winding of AC side of each converters (6) and transformer (T2) connects one to one, and former side's winding of transformer (T2) inserts electrical network;
Described composite energy storage unit (5) comprises storage battery (7), ultracapacitor (8), a DC/DC translation circuit (9) and the 2nd DC/DC translation circuit (10), ultracapacitor (8) connects an end of a DC/DC translation circuit (9), the other end of the one DC/DC translation circuit (9) is in parallel with an end of storage battery (7) and the 2nd DC/DC translation circuit (10) respectively, and the other end of the 2nd DC/DC translation circuit (10) is connected in parallel on the dc bus side of converters (6).
2. based on the voltage and power regulator of storage battery and ultracapacitor composite energy storage, comprise energy-storage module (3), Technics of Power Electronic Conversion module (4) and transformer (T2); Described energy-storage module (3) is made of M composite energy storage unit (5), and Technics of Power Electronic Conversion module (4) is made of N converters (6), M 〉=1, N＞1; Composite energy storage unit (5) all is connected in parallel on the dc bus side of converters (6), and secondary side's winding of AC side of each converters (6) and transformer (T2) connects one to one, and former side's winding of transformer (T2) inserts electrical network;
Described composite energy storage unit (5) comprises storage battery (7), ultracapacitor (8), a DC/DC translation circuit (9) and the 2nd DC/DC translation circuit (10), storage battery (7) connects an end of a DC/DC translation circuit (9), the other end of the one DC/DC translation circuit (9) is in parallel with an end of ultracapacitor (8) and the 2nd DC/DC translation circuit (10) respectively, and the other end of the 2nd DC/DC translation circuit (10) is connected in parallel on the dc bus side of converters (6).
3. based on the voltage and power regulator of storage battery and ultracapacitor composite energy storage, comprise energy-storage module (3), Technics of Power Electronic Conversion module (4) and transformer (T2); Described energy-storage module (3) is made of M composite energy storage unit (5), and Technics of Power Electronic Conversion module (4) is made of N converters (6), M 〉=1, N＞1; Composite energy storage unit (5) all is connected in parallel on the dc bus side of converters (6), and secondary side's winding of AC side of each converters (6) and transformer (T2) connects one to one, and former side's winding of transformer (T2) inserts electrical network;
Described composite energy storage unit (5) comprises storage battery (7), ultracapacitor (8), a DC/DC translation circuit (9) and the 2nd DC/DC translation circuit (10), storage battery (7) connects an end of a DC/DC translation circuit (9), ultracapacitor (8) connects an end of the 2nd DC/DC translation circuit (10), first, the other end of two DC/DC translation circuits (9,10) is connected in parallel on the dc bus side of converters (6) respectively.
4. according to claim 1 or 2 or 3 described voltage and power regulators, it is characterized in that the output voltage of each secondary side's winding of described transformer (T2) has phase angle difference.
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| CN2009100624555A CN101567564B (en) | 2009-06-09 | 2009-06-09 | Voltage and power regulator based on the composite energy storage of storage battery and super capacitor |
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| CN2009100624555A CN101567564B (en) | 2009-06-09 | 2009-06-09 | Voltage and power regulator based on the composite energy storage of storage battery and super capacitor |
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| CN101567564B true CN101567564B (en) | 2011-04-20 |
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