CN201887525U - Hybrid energy storage system for photovoltaic power generation system - Google Patents
Hybrid energy storage system for photovoltaic power generation system Download PDFInfo
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- CN201887525U CN201887525U CN2010206793930U CN201020679393U CN201887525U CN 201887525 U CN201887525 U CN 201887525U CN 2010206793930 U CN2010206793930 U CN 2010206793930U CN 201020679393 U CN201020679393 U CN 201020679393U CN 201887525 U CN201887525 U CN 201887525U
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The utility model relates to a hybrid energy storage system for a photovoltaic power generation system, which is used for solving the problems that the energy storage system of a traditional storage battery has low power density and a short service life. The technical scheme is as follows: the hybrid energy storage system for the photovoltaic power generation system comprises a chopper circuit, a first boosting circuit, a second boosting circuit, a storage battery group and a super capacitor group; the high-voltage side of the chopper circuit is connected with a direct current bus of the photovoltaic power generation system, and the low-voltage side of the chopper circuit is connected with the storage battery group; the low-voltage side of the first boosting circuit is connected with the storage battery group, and the high-voltage side of the first boosting circuit is connected with the super capacitor group; and the low-voltage side of the second boosting circuit is connected with the super capacitor group, and the high-voltage side of the second boosting circuit is connected with the direct current bus of the photovoltaic power generation system. Compared with traditional energy storage devices, the hybrid energy storage system for the photovoltaic power generation system provided by the utility model has the advantages that the storage batteries have high energy density and the super capacitors have high power density, so that the electricity output quality of the photovoltaic power generation system is greatly improved, the service life is long, and the integrated operation cost of the photovoltaic power generation system is reduced.
Description
Technical field
The utility model relates to that a kind of what be used for photovoltaic generating system is the mixed energy storage system of energy-storage travelling wave tube with ultracapacitor and storage battery, belongs to technical field of power generation.
Background technology
Photovoltaic generating system is different from the conventional power generation usage system, is subjected to the influence of natural causes such as intensity of illumination and temperature, and the power output of photo-voltaic power supply can produce bigger fluctuation, to such an extent as to can not be the conventional load normal power supply.In order to suppress this fluctuation, energy-storage system need be installed in photovoltaic generating system.At present, energy storage device commonly used in the photovoltaic generating system is an energy storage battery, storage battery production technology maturation, energy density is big, price is relatively low, and what be fit to discharges and recharges control, and the batteries to store energy system provides guarantee for the power supply reliability of photovoltaic generating system.But the power density of storage battery is low, be not suitable for the occasion of high-power power supply, and its cycle life is short, and the energy-storage system partial circulating charge and discharge phenomena that illumination variation and load frequent fluctuation cause can shorten the useful life of storage battery, causes photovoltaic generating system integrated operation cost to increase.
Ultracapacitor is a kind of emerging energy storage device, it have extended cycle life, discharge and recharge that speed is fast, power density is big, therefore, ultracapacitor is applicable to the occasion of photo-voltaic power supply power output frequent variations and is the occasion of high power load power supply in short-term.And these characteristics of ultracapacitor can form with storage battery just and have complementary advantages.At the energy storage characteristics of ultracapacitor and storage battery, there are some experts, scholar to propose two kinds of elements are united the hybrid energy-storing pattern of use in recent years, but up to the present, also do not have a kind of feasible technical scheme.
The utility model content
The utility model be used to overcome prior art defective, provide a kind of energy density and power density big, and the mixed energy storage system that is used for photovoltaic generating system of long service life.
The alleged problem of the utility model realizes with following technical proposals:
A kind of mixed energy storage system that is used for photovoltaic generating system, comprise chopper circuit, first booster circuit, second booster circuit, batteries and bank of super capacitors in the formation, the high pressure side joint photovoltaic generating system dc bus of described chopper circuit, low pressure side joint batteries, the low pressure side joint batteries of first booster circuit, high pressure side joint bank of super capacitors, the low pressure side joint bank of super capacitors of second booster circuit, the dc bus of high pressure side joint photovoltaic generating system.
The above-mentioned mixed energy storage system that is used for photovoltaic generating system, described chopper circuit is made up of first insulated gate bipolar transistor, first inductance, first diode and first electric capacity, the collector electrode of first insulated gate bipolar transistor connects photovoltaic generating system dc bus positive pole, emitter charges through the first inductance accumulators group, the base stage connection control circuit, first diode is a fly-wheel diode, and first electric capacity is the chopper circuit output filter capacitor; Described first booster circuit is made up of second insulated gate bipolar transistor, second inductance and second diode, second inductance, one termination batteries positive pole, the other end charges to bank of super capacitors through second diode, the collector electrode of second insulated gate bipolar transistor connects the serial connection point of second inductance and second diode, emitter connects the public negative pole of bank of super capacitors, batteries and photovoltaic generating system dc bus, base stage connection control circuit; Described second booster circuit is made up of the 3rd insulated gate bipolar transistor, the 3rd inductance, the 3rd diode and second electric capacity, the 3rd inductance one termination bank of super capacitors positive pole, the electric current of other end output is delivered to photovoltaic generating system dc bus positive pole through the 3rd diode, the collector electrode of the 3rd insulated gate bipolar transistor connects the serial connection point of the 3rd inductance and the 3rd diode, emitter connects the bank of super capacitors negative pole, base stage connection control circuit, second electric capacity are the output filter capacitors of second booster circuit.
The utility model is with bank of super capacitors and the batteries energy-storage travelling wave tube as photovoltaic generating system, thereby have the big and big advantage of ultracapacitor power density of storage battery energy density concurrently, improved the quality that photovoltaic generating system is exported electric energy greatly.Chopper circuit and two booster circuits are used for accurately controlling the charge and discharge process of bank of super capacitors and batteries, make the bank of super capacitors power density big, have extended cycle life, advantage that storage battery energy density is big can be not fully exerted, and prevent the overcharging of storage battery, overdischarge, reduce even avoid the generation of accumulator cell charging and discharging partial circulating phenomenon, prolong the useful life of storage battery to greatest extent, reduced the integrated operation cost of photovoltaic generating system.
Description of drawings
Fig. 1 is the electric theory diagram of photovoltaic generating system;
Fig. 2 is an electrical schematic diagram of the present utility model;
Fig. 3 is that the mixed energy storage system capacity is distributed the method calculation flow chart rationally.
Each symbol is among the figure: DC/DC1, chopper circuit; DC/DC2, first booster circuit, DC/DC3, second booster circuit; B, batteries; EDLC, bank of super capacitors; T1, T2, T3, insulated gate bipolar transistor; L1, L2, L3, inductance; C1, C2, electric capacity; D1, D2, D3, diode.
Embodiment
Referring to Fig. 1 and Fig. 2, the utility model mainly is made up of five parts, is respectively: chopper circuit DC/DC1, the first booster circuit DC/DC2, the second booster circuit DC/DC3, bank of super capacitors EDLC and batteries B.
The high-pressure side of chopper circuit DC/DC1 directly is connected with the photovoltaic generating system dc bus, low-pressure side connects batteries B, the low-pressure side of the first booster circuit DC/DC2 connects batteries B, the high-pressure side connects bank of super capacitors EDLC, the low-pressure side of the second booster circuit DC/DC3 connects bank of super capacitors EDLC, and the dc bus of photovoltaic generating system is directly inserted in the high-pressure side; Mixed energy storage system can be according to the power demand situation on the photovoltaic generating system dc bus, by chopper circuit DC/DC1, the first booster circuit DC/DC2, the second booster circuit DC/DC3 batteries B and bank of super capacitors EDLC are discharged and recharged control flexibly, solve the confession electricity consumption imbalance problem of photovoltaic generating system; Power among the chopper circuit DC/DC1 of this system, the first booster circuit DC/DC2, the second booster circuit DC/DC3 all is one-way flow, and is faster than the reversible controller response speed; The first booster circuit DC/DC2 can different bank of super capacitors EDLC and the batteries B of link voltage, make both can be more flexible in capacity configuration; The discharge mode of second booster circuit DC/DC3 control mixed energy storage system can also play the effect of stable DC busbar voltage simultaneously, has suppressed the influence of bank of super capacitors EDLC terminal voltage variation to electric, has improved the electric quality of power supply.
Because bank of super capacitors EDLC power density is big, have extended cycle life, and batteries B cycle life is short, the condition that discharges and recharges is strict relatively, therefore, when photo-voltaic power supply output pulsation or bearing power fluctuation, should control discharging and recharging of mixed energy storage system flexibly, in the assurance system power supply quality of power supply, optimize the charging and discharging of accumulator process, prolong its useful life.
The utility model should be optimized configuration to the capacity of bank of super capacitors EDLC and batteries B according to local climate feature, photovoltaic generating system scale and factors such as technical indicator, part throttle characteristics, and the concrete method of distributing rationally is as follows:
(1) analyzes local radiation data, temperature data, obtain representative day radiation variation rule and degree/day Changing Pattern;
(2), obtain the day generating curve of photovoltaic generating system according to photovoltaic cell parameter, photovoltaic generating system scale and degree/day Changing Pattern and day radiation variation rule;
(3) analyze local power load, obtain to characterize the load parameter of local part throttle characteristics;
(4) according to the charge-discharge characteristic of photovoltaic generating system power generation features, load operation characteristic, bank of super capacitors EDLC and batteries B, and, list bank of super capacitors EDLC and batteries B stored energy capacitance and discharge and recharge the requirement of power according to the every technical indicator of photovoltaic generating system;
(5) be constraints with the every technical indicator of photovoltaic generating system, macroeconomic with energy-storage system is an optimization aim, after constraints carried out linearization process, use simplex method to solve the mathematical optimization problem, thereby obtain the configuration scheme of bank of super capacitors EDLC and batteries B.
The utility model is at the above-mentioned method of distributing rationally, be platform development with VC++6.0 the mixed energy storage system capacity distribute software rationally, photovoltaic generating system at different regions, different scales and different part throttle characteristics, import corresponding characteristic parameter, can obtain the configuration scheme of ultracapacitor and storage battery.
In charge and discharge process, the operating state of chopper circuit DC/DC1, the first booster circuit DC/DC2, the second booster circuit DC/DC3 and the feature that discharges and recharges of bank of super capacitors and batteries have following several modes:
(1) the sufficient period of daylight, it is bigger that photo-voltaic power supply sends power, bearing power is also bigger, dump power on the dc bus is within the scope of storage battery safe charging power requirement, at this moment, chopper circuit DC/DC1 works in the syllogic charge mode according to the energy storage state of batteries, and DC/DC2 and DC/DC3 power output are zero.Under this working method, the photovoltaic bus is a battery charging, and bank of super capacitors is neither charged and also do not discharged;
(2) the sufficient period of daylight, it is bigger that photo-voltaic power supply sends power, bearing power is less, dump power on the dc bus is greater than the storage battery safe charging power requirement upper limit, at this moment, DC/DC1 works in the syllogic charge mode according to the energy storage state of batteries, and the DC/DC2 power output is the difference of system's charging gross power and batteries safe charging power, and the DC/DC3 power output is zero.Under this working method, the photovoltaic bus is a battery charging, and bank of super capacitors is in charged state, absorbs superfluous electric energy, thus the protection batteries;
(3) be subjected in short-term that cloud layer blocks or high-power load impact causes photo-voltaic power supply in short-term can not be for the load normal power supply time when photovoltaic generating system, the DC/DC1 power output is zero, and the DC/DC2 power output is zero, and DC/DC3 is with the constant-voltage mode power output.Under this working method, batteries is neither charged and is not also discharged, and bank of super capacitors is in discharge condition provides in short-term energy requirement for load, thereby has prevented the partial circulating that discharges and recharges of batteries, has prolonged batteries useful life;
(4) unglazed during when being in not enough period of illumination such as morning, dusk or wet weather, night etc. according to the period, photo-voltaic power supply can not be the load normal power supply, the DC/DC1 power output is zero, DC/DC2 exports with the inductive current constant-mode, power output is this period load average power, and DC/DC3 is with the constant-voltage mode power output.Under this working method, batteries is discharged with cross-flow mode, and discharge power is for the average power of this period load, and when load power was higher than average power, bank of super capacitors was discharged, and discharge power is the difference of load power and batteries discharge power; When load power was lower than average power, the batteries discharge power was satisfying under the demand of load operation, was the bank of super capacitors charging with dump power, and is required in order to next load peak.Like this, improved the power output capacity of energy-storage system and optimized the discharge process of batteries.
Claims (2)
1. mixed energy storage system that is used for photovoltaic generating system, it is characterized in that, comprise chopper circuit (DC/DC1) in the formation, first booster circuit (DC/DC2), second booster circuit (DC/DC3), batteries (B) and bank of super capacitors (EDLC), the high pressure side joint photovoltaic generating system dc bus of described chopper circuit (DC/DC1), low pressure side joint batteries (B), the low pressure side joint batteries (B) of first booster circuit (DC/DC2), high pressure side joint bank of super capacitors (EDLC), the low pressure side joint bank of super capacitors (EDLC) of second booster circuit (DC/DC3), the dc bus of high pressure side joint photovoltaic generating system.
2. according to the described mixed energy storage system that is used for photovoltaic generating system of claim 1, it is characterized in that, described chopper circuit (DC/DC1) is by first insulated gate bipolar transistor (T1), first inductance (L1), first diode (D1) and first electric capacity (C1) are formed, the collector electrode of first insulated gate bipolar transistor (T1) connects photovoltaic generating system dc bus positive pole, emitter charges through first inductance (L1) accumulators group (B), the base stage connection control circuit, first diode (D1) is a fly-wheel diode, and first electric capacity (C1) is chopper circuit (DC/DC1) output filter capacitor; Described first booster circuit (DC/DC2) is by second insulated gate bipolar transistor (T2), second inductance (L2) and second diode (D2) are formed, second inductance (L2) termination batteries (B) positive pole, the other end is given bank of super capacitors (EDLC) charging through second diode (D2), the collector electrode of second insulated gate bipolar transistor (T2) connects the serial connection point of second inductance (L2) and second diode (D2), emitter connects bank of super capacitors (EDLC), the public negative pole of batteries (B) and photovoltaic generating system dc bus, the base stage connection control circuit; Described second booster circuit (DC/DC3) is by the 3rd insulated gate bipolar transistor (T3), the 3rd inductance (L3), the 3rd diode (D3) and second electric capacity (C2) are formed, the 3rd inductance (L3) termination bank of super capacitors (EDLC) positive pole, the electric current of other end output is connected to photovoltaic generating system dc bus positive pole through the 3rd diode (D3), the collector electrode of the 3rd insulated gate bipolar transistor (T3) connects the serial connection point of the 3rd inductance (L3) and the 3rd diode (D3), emitter connects bank of super capacitors (EDLC) negative pole, the base stage connection control circuit, second electric capacity (C2) is the output filter capacitor of second booster circuit (DC/DC3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206793930U CN201887525U (en) | 2010-12-24 | 2010-12-24 | Hybrid energy storage system for photovoltaic power generation system |
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| CN2010206793930U CN201887525U (en) | 2010-12-24 | 2010-12-24 | Hybrid energy storage system for photovoltaic power generation system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842963A (en) * | 2012-09-21 | 2012-12-26 | 中国科学院广州能源研究所 | Secondary battery and super capacitor mixed energy storage management system |
| CN102931687A (en) * | 2012-10-12 | 2013-02-13 | 华北电力大学（保定） | Power adjustment method for hybrid energy storage photovoltaic power station |
| CN103001331A (en) * | 2012-11-13 | 2013-03-27 | 中国电力科学研究院 | Economic optimized dispatching method for energy storage power stations |
| CN103072854A (en) * | 2013-01-15 | 2013-05-01 | 福建省特种设备检验研究院 | Elevator energy-saving device based on solar technology and operation control method thereof |
| CN103683848A (en) * | 2012-09-19 | 2014-03-26 | 株式会社东芝 | Power supply system and power supply controller |
| CN106921174A (en) * | 2015-12-25 | 2017-07-04 | 富士电机株式会社 | Control device |
-
2010
- 2010-12-24 CN CN2010206793930U patent/CN201887525U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683848A (en) * | 2012-09-19 | 2014-03-26 | 株式会社东芝 | Power supply system and power supply controller |
| CN102842963A (en) * | 2012-09-21 | 2012-12-26 | 中国科学院广州能源研究所 | Secondary battery and super capacitor mixed energy storage management system |
| CN102931687A (en) * | 2012-10-12 | 2013-02-13 | 华北电力大学（保定） | Power adjustment method for hybrid energy storage photovoltaic power station |
| CN102931687B (en) * | 2012-10-12 | 2014-10-22 | 华北电力大学（保定） | Power adjustment method for hybrid energy storage photovoltaic power station |
| CN103001331A (en) * | 2012-11-13 | 2013-03-27 | 中国电力科学研究院 | Economic optimized dispatching method for energy storage power stations |
| CN103072854A (en) * | 2013-01-15 | 2013-05-01 | 福建省特种设备检验研究院 | Elevator energy-saving device based on solar technology and operation control method thereof |
| CN103072854B (en) * | 2013-01-15 | 2014-08-13 | 福建省特种设备检验研究院 | Elevator energy-saving device based on solar technology and operation control method thereof |
| CN106921174A (en) * | 2015-12-25 | 2017-07-04 | 富士电机株式会社 | Control device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110629 Termination date: 20131224 |