CN103199630A - High-capacity medium voltage battery energy storage system - Google Patents
High-capacity medium voltage battery energy storage system Download PDFInfo
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Abstract
The invention discloses a high-capacity medium voltage battery energy storage system. An output end of an energy storage battery unit is connected with an input end of a pre-charging circuit to transfer a direct current voltage, an output end of the pre-charging circuit is connected with a direct current end of a single phase H bridge converter to transfer the direct current voltage, and an output end of the single phase H bridge converter is connected with a reactor in series. Therefore, one energy storage unit is formed, alternating current sides of a plurality of energy storage units are connected in series and then are connected with a connection inductor in series to form a branch circuit, three branch circuits are connected in an end-to-end mode to form a triangular connection, and then three endpoints of the triangular are connected with a medium voltage power grid in a three-phase mode. A grid inductor is formed by connecting of inductors of all energy storage units in series, the effect of single inductor fault on the system is small, and reliability is high. Under the same power, the high-capacity medium voltage battery energy storage system is high in voltage, small in current and current harmonics and low in demands on single capacity of a battery. Redundancy can be realized through a bypath, and reliability is high. The high-capacity medium voltage battery energy storage system has a balancing function on the battery. Compared with a medium voltage energy storage system of primary side star connection, the high-capacity medium voltage battery energy storage system is easy to control and high in reliability.
Description
Technical field
What the present invention relates to is a kind of jumbo middle energy-storage system of pressing, and specifically is the modular interchange cascade structure of a kind of employing energy-storage system, is used for the occasion of high capacity cell energy storage.Belong to electric energy storage field.
Background technology
Adopting battery energy storage system smooth wind power and photovoltaic generation power is to solve the be incorporated into the power networks effective way of the difficult and wind-powered electricity generation problem of " abandoning wind " of new forms of energy.The application of big capacity electricity energy storage in electrical network changed that electric energy can only transmit can not stored historical, brings revolutionary impact to electrical network production and operation, greatly promotes the development of China's intelligent grid.
Battery energy storage system adopts the DC/AC bidirectional power converter, realizes that the power bi-directional between battery and the electrical network flows, and power inverter is the core of energy-storage system energy control.In most of stored energy application, power inverter adopts the low pressure scheme, exchange side voltage general≤AC690V, the single-machine capacity capacity is generally at hundreds of kW, bigger capacity then need exchange side realization in parallel by many power inverters.Indivedual model power inverters of ABB AB adopt the IGCT power device, and dc voltage can reach 3-5kV, exchange side voltage and can reach 2kV.
The power inverter separate unit capacity of low pressure scheme is limited, needs the mode dilatation by many parallel connections and adopt step-up transformer to boost when big capacity applications.The power inverter of using in the current battery energy storage mainly contains DC/AC single step arrangement and two kinds of versions of DC/DC+DC/AC stage type structure.Consider single stage type power inverter efficient＜98%, stage type power inverter efficient＜96%, transformer loss 2%, the energy-storage system gross efficiency is respectively＜and 96% and＜94%, system effectiveness is low.
The power inverter dc voltage of the energy-storage system of ABB is too high, needs extremely a large amount of battery series connection to use, and the short slab effect of battery is remarkable, and existing cell balancing can't guarantee its operation steady in a long-term.
(publication number: CN102355065), its primary side adopts Y-connection, realizes discharging and recharging and function such as equilibrium by the control to three phase voltages at disclosed Chinese invention patent " pressing energy-storage system in a kind of modularization ".Its weak point is that energy-storage system needs amplitude and the phase place of three-phase voltage are suitably controlled when carrying out alternate equilibrium and fault redundance control, but intercouples in the control of three phase voltages, and the control difficulty is higher, is unfavorable for its stable operation.
In the device of similar chain structure, primary side is incorporated into the power networks and all adopts centralized connection reactance, reason owing to structural configuration, consider the reactance lower end that may exist directly over the ground/phase fault, connecting reactance need be according to the electric power design of bearing direct short-circuit, cost height, big, the anti-saturation requirement height of volume.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, a kind of jumbo middle energy-storage system of pressing is proposed, three-phase adopts the structure of modularization energy-storage units cascade, energy-storage units inside carries the connection reactor, adopt triangle to connect after the energy-storage units cascade, leg-of-mutton three summits connect medium voltage network three lines.Three branch currents are controlled mutual decoupling zero, and control is simple, and the reliability height can be realized the equalization function to battery.
For realizing above-mentioned purpose, the invention provides piezoelectricity pond energy-storage system in a kind of big capacity, comprise the energy-storage battery unit, pre-charge circuit, single-phase H bridge two way convertor and connection reactance, wherein: the output of energy-storage battery unit links to each other with the input of pre-charge circuit and transmits direct voltage, the output of pre-charge circuit links to each other with the dc terminal of single-phase H bridging parallel operation with the transmission direct voltage, the output of single-phase H bridging parallel operation be connected reactance series connection, so constitute energy-storage units, a plurality of energy-storage units exchange side series connection back and form a branch road, three branch roads join end to end and form the triangle connection, leg-of-mutton three end points are connected with medium voltage network three again, described system takes the leg-of-mutton H bridge of three-phase cascade structure, each line props up a plurality of energy-storage units series connection of route and constitutes, and energy-storage units adopts single-phase H bridging parallel operation to realize the AC/DC two-way changing of electric energy.
Described energy-storage battery unit is made up of the connection in series-parallel of rechargeable battery.
Described pre-charge circuit comprises: 1 resistance and 1 contactor, wherein: resistance and contactor parallel connection.
Described single-phase H bridging parallel operation comprises 4 electronic power switch devices and dc capacitor, and 4 switching devices are connected to single-phase H bridge construction, and dc capacitor is connected in parallel on DC side, the output of single-phase H bridging parallel operation be connected inductance series connection.
Described connection reactance both can be air core reactor, also can be the reactor of ribbon core.
Can utilize the mutual ratio of controlling each energy-storage units output voltage amplitude to realize the balancing energy of the different energy-storage units on the same line voltage branch road among the present invention.
Can utilize the current ratio of controlling three line voltage branch roads to realize the gross energy equilibrium of the energy-storage units on the not collinear branch road among the present invention.
Compared with prior art, the invention has the beneficial effects as follows: under constant power, high voltage, little electric current, current harmonics are little, and be low to the battery cell capacity requirement; Can realize redundancy by bypass; Has the equalization function to battery.Cost is low than low pressure energy storage scheme during the big capacity of MW level.Middle pressure energy-storage system control than the primary side Y-connection is simple, and reliability is higher.Energy-storage units inside carries the connection reactor, and single connection reactor only needs to design according to the electric pressure of H bridge current transformer, and requirement of withstand voltage is low.Owing to need not to connect in addition centralized connection reactor, integral body is fit to modular arrangement more, and is maintainable better, reduced floor space and cost simultaneously.Under constant power, little than three-phase Y-connection mode electric current, lower to the battery cell capacity requirement.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the energy-storage units schematic diagram of one embodiment of the invention.
Fig. 2 is the structure chart of pressing the integral body of energy-storage system in the big capacity of one embodiment of the invention.
Fig. 3 is the circuit theory diagrams of one embodiment of the invention.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit the present invention in any form.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Shown in Fig. 1-2, piezoelectricity pond energy-storage system comprises in the big capacity provided by the present invention: 3N energy-storage battery unit, a 3N pre-charge circuit, a 3N single-phase H bridging parallel operation, a 3N connection reactance.Wherein: the output of 3N energy-storage battery links to each other with the input of 3N pre-charge circuit respectively and transmits direct voltage, the output of 3N pre-charge circuit links to each other with the transmission direct voltage with the dc terminal of 3N single-phase H bridging parallel operation respectively, 3N 3N of H bridging parallel operation output series connection connects reactance, so constitute 3N energy-storage units AB1, the AB2 that structure is identical ... ABN, BC1, BC2 ... BCN, CA1, CA2 ... CAN.Line voltage U AB props up route N energy-storage units AB1, AB2 ... ABN exchanges side and is composed in series; Line voltage U BC props up route N energy-storage units BC1, BC2 ... BCN exchanges side and is composed in series; Line voltage U CA props up route N energy-storage units CA1, CA2 ... CAN exchanges side and is composed in series; Three branch roads join end to end, and constitute triangle and connect, and leg-of-mutton three end points are connected with medium voltage network three again.
Embodiment
Present embodiment is the 2MW*2h battery energy storage system, rated voltage 10kV.
As shown in Figure 3, the energy-storage units of present embodiment comprises: 1 batteries, 1 resistance, 1 contactor, 1 group of electric capacity, 4 IGBT are connected reactance and form with 1.Each 20 energy-storage units of A, B, C three-phase connect and compose according to the mode of Fig. 2 and to press energy-storage system in whole.
In the present embodiment, described 1 secondary battery unit rated voltage 960V, nominal capacity 200Ah.
In the present embodiment, described pre-charge circuit is made up of 1 resistance R 1,1 contactor K1.Wherein: resistance R 1 and contactor K1 parallel connection.The end of resistance R 1, contactor K1 is connected to the positive pole of batteries, is the input of pre-charge circuit; The other end of resistance R 1 and contactor K1 is the output of pre-charge circuit.The resistance of R1 is 200 ohm, the rated voltage 1200VDC of K1, rated current 100A.
In the present embodiment, described single-phase H bridging parallel operation is by 1 group capacitor C1, IGBT device V1, V2, V3, V4 and be connected reactance L and form.Wherein: V1 and V2 series connection constitutes a branch road, and V3 and V4 series connection constitute a branch road, and above-mentioned two branch roads and capacitor group C1 are in parallel again, the output of H bridging parallel operation be connected inductance L and connect.Capacitor group C1 rated voltage 1400VDC, capacity 4000uF.IGBT device V1, V2, V3, V4 rated voltage 1700V, rated current 200A.The connection reactance L inductance value 1mH of H bridging parallel operation, rated voltage 800V, rated current 200A.Make that so the total inductance amount of single line branch road is 20mH.
The course of work of present embodiment is as follows:
1, keep switching device V1, V2, V3, the V4 of the single-phase H bridging parallel operation of each energy-storage units to be in off state.
2, will be composed in series rated voltage 960V, the secondary battery unit of nominal capacity 200Ah by 20 nominal voltage 48V/200Ah ferric phosphate lithium cell modules.Each energy-storage units left side secondary battery unit input dc power is because the secondary battery unit pressure changes its scope range of the fluctuation of voltage 800-1200VDC along with the variation of its electric weight.
3, at first charge to capacitor group C1 through resistance R 1, to the initial charge current 15-20A of capacitor group C1, capacitor group C1 powers on to press and is raised near DC input voitage behind the process 3s.Closed K1 is with resistance R 1 bypass, and capacitor group C1 voltage equates fully with accumulator battery voltage.
When 4, charging to energy-storage system from electrical network, the energy-storage units H bridging parallel operation of control UAB, UBC, three branch roads of UCA, make that the phase difference that flows into energy-storage system electric current I ab, Ibc, Ica and Uab, Ubc, Uca is 90 degree, the phase place of its three branch road output voltage U vab of while, Uvbc, Uvca slightly is ahead of grid line voltage U sab, Usbc and the certain electrical degree of Usca gets final product.Regulate the size that phase angle difference between the two can be regulated charge power.
When 5, discharging from energy-storage system to electrical network, the energy-storage units H bridging parallel operation of control UAB, UBC, three branch roads of UCA, make that the phase difference that flows into energy-storage system electric current I ab, Ibc, Ica and Uab, Ubc, Uca is 90 degree, the phase place of its three branch road output voltage U vab of while, Uvbc, Uvca slightly lags behind line voltage Usab, Usbc and the certain electrical degree of Usca gets final product.Regulate the size that phase angle difference between the two can be regulated discharge power.
6, during energy storage system discharges, when the energy of 20 energy-storage units storage of UAB branch road is unequal, according to the output voltage amplitude of the single-phase H bridging parallel operation of each energy-storage units of proportional control of the energy of each energy-storage units storage, can make the active power of output of each energy-storage units on the UAB branch road be directly proportional with the energy of its storage.Thereby reach balancing energy between each energy-storage units on the UAB branch road, prevent the purpose of overdischarge.
7, operation in like manner, in the time of can making energy storage system discharges, energy reaches balanced between the energy-storage units of UBC branch road, UCA branch road, prevents overdischarge.
When 8, energy-storage system charges, when the energy of 20 energy-storage units storage of UAB branch road is unequal, according to the output voltage amplitude of the single-phase H bridging parallel operation of each energy-storage units of proportional control of the chargeable energy of each energy-storage units, can make the defeated as meritorious power of each energy-storage units on the UAB branch road be directly proportional with its chargeable energy.Thereby reach balancing energy between each energy-storage units on the UAB branch road, prevent the purpose of overcharging.
9, operation in like manner, in the time of can making energy storage system discharges, energy reaches balanced between the energy-storage units of UBC branch road, UCA branch road, prevents from overcharging.
10, during energy storage system discharges, gross energy three as the gross energy of 20 energy-storage units storages of gross energy, UBC branch road of 20 energy-storage units of energy-storage system UAB branch road storage and 20 energy-storage units storages of UCA branch road is unequal, the energy-storage units H bridging parallel operation of control UAB, UBC, three branch roads of UCA makes the ratio of branch road output total voltage Uvab, Uvbc, Uvca equal the ratio of the gross energy of energy-storage units storage on three branch roads.Thereby can realize the discharge energy equilibrium between UAB, UBC, three branch roads of UCA.
When 11, energy-storage system charges, gross energy three as the gross energy of 20 energy-storage units storages of gross energy, UBC branch road of 20 energy-storage units of energy-storage system UAB branch road storage and 20 energy-storage units storages of UCA branch road is unequal, the energy-storage units H bridging parallel operation of control UAB, UBC, three branch roads of UCA makes the ratio of branch road output total voltage Uvab, Uvbc, Uvca equal the ratio of the chargeable gross energy of energy-storage units on three branch roads.Thereby can realize the rechargeable energy equilibrium between UAB, UBC, three branch roads of UCA.
The advantage of present embodiment is 10kV direct screening electrical network, transless, and single-machine capacity is big, efficient is high; Cost is low than the low pressure scheme under the equal capacity of MW level; Under the equal capacity, present embodiment than low pressure scheme voltage height, electric current is little, current harmonics is little, and is low to the battery cell capacity requirement; Can realize the equalization function to battery.When some energy-storage units faults, can realize the fault redundance operation of energy-storage system by the control bypass fault energy-storage units to the switching device of its H bridging parallel operation.
Compare in the primary side Y-connection and press energy-storage system, its energy-storage units is more under the equal capacity, and therefore required energy-storage units power and electric current are littler, require lower to battery capacity.When some energy-storage units faults, its influence only only limits to the energy-storage units place branch road of fault, to the not influence fully of other branch roads, does not have the problem that influences to other two-phases that exists in the primary side star structure.When realizing three branch roads balanced, its voltage control also is full decoupled, does not have the amplitude that needs in the primary side star structure to coordinate between the three-phase voltage and the problem of phase place.Therefore, simpler in the control, reliability is higher.
Because each energy-storage units inside all carries the connection reactor, flat ripple effect is played in the connection reactance of the energy-storage units inside on each branch road jointly, and single reactor inductance amount requires little, and requirement of withstand voltage is low.Because need not the centralized connection reactor of outside series connection, overall structure is modularization more, maintains easily and changes, and has reduced floor space and cost simultaneously.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned specific implementations, those skilled in the art can make various distortion or modification within the scope of the claims, and this does not influence flesh and blood of the present invention.
Claims (5)
1. piezoelectricity pond energy-storage system in the big capacity, it is characterized in that comprising the energy-storage battery unit, pre-charge circuit, single-phase H bridging parallel operation and connection inductance, wherein: the output of energy-storage battery unit links to each other with the input of pre-charge circuit and transmits direct voltage, the output of pre-charge circuit links to each other with the dc terminal of single-phase H bridging parallel operation with the transmission direct voltage, the output of single-phase H bridging parallel operation be connected reactance series connection, so constitute energy-storage units, a plurality of energy-storage units exchange side series connection back and form a branch road, three branch roads join end to end and form the triangle connection, leg-of-mutton three end points are connected with medium voltage network three again, described system takes the leg-of-mutton H bridge of three-phase cascade structure, each line props up a plurality of energy-storage units series connection of route and constitutes, and energy-storage units adopts single-phase H bridging parallel operation to realize the AC/DC two-way changing of electric energy.
2. piezoelectricity pond energy-storage system in the big capacity according to claim 1 is characterized in that: the balancing energy of realizing different energy-storage units on the same line voltage branch road by the mutual ratio of controlling each described energy-storage units output voltage amplitude.
3. piezoelectricity pond energy-storage system in the big capacity according to claim 1 is characterized in that: realize the gross energy equilibrium of the energy-storage units on the not collinear voltage branch road by the current amplitude ratio of controlling three line voltage branch roads.
4. according to pressing energy-storage system in each described modularization of claim 1-3, it is characterized in that: described energy-storage battery unit is made up of the connection in series-parallel of rechargeable battery.
5. according to piezoelectricity pond energy-storage system in each described big capacity of claim 1-3, it is characterized in that: described single-phase H bridging parallel operation comprises 4 electronic power switch devices and dc capacitor, 4 switching devices are connected to single-phase H bridge construction, dc capacitor is connected in parallel on DC side, the output of single-phase H bridging parallel operation be connected inductance series connection.
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| CN105071547A (en) * | 2015-09-23 | 2015-11-18 | 山东圣阳电源股份有限公司 | Cascaded battery energy storage system and maintenance method therefor |
| CN105552454A (en) * | 2015-10-31 | 2016-05-04 | 芜湖宏景电子股份有限公司 | Redundant active equalization battery pack |
| US10270328B2 (en) | 2015-02-04 | 2019-04-23 | Abb Schweiz Ag | Multilevel converter with energy storage |
| CN110679054A (en) * | 2017-06-02 | 2020-01-10 | 松下知识产权经营株式会社 | Electricity storage system |
| CN114336701A (en) * | 2021-12-01 | 2022-04-12 | 国网江苏省电力有限公司盐城供电分公司 | Medium-voltage direct-hanging energy storage system topological structure suitable for high power and large capacity |
| CN114465255A (en) * | 2022-01-06 | 2022-05-10 | 中国能源建设集团广东省电力设计研究院有限公司 | Angle-shaped modular electric energy storage system |
| CN114865755A (en) * | 2022-07-06 | 2022-08-05 | 荣耀终端有限公司 | Multi-battery power supply, charging and discharging method and electronic equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10270328B2 (en) | 2015-02-04 | 2019-04-23 | Abb Schweiz Ag | Multilevel converter with energy storage |
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| CN114336701B (en) * | 2021-12-01 | 2023-11-24 | 国网江苏省电力有限公司盐城供电分公司 | Medium-voltage direct-hanging energy storage system topological structure suitable for high power and large capacity |
| CN114465255A (en) * | 2022-01-06 | 2022-05-10 | 中国能源建设集团广东省电力设计研究院有限公司 | Angle-shaped modular electric energy storage system |
| CN114865755A (en) * | 2022-07-06 | 2022-08-05 | 荣耀终端有限公司 | Multi-battery power supply, charging and discharging method and electronic equipment |
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Application publication date: 20130710 |