CN103236747B - Photovoltaic power supply hybrid energy storage system - Google Patents
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- 238000004146 energy storage Methods 0.000 title claims abstract description 152
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- 230000008859 change Effects 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 13
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
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- 238000005286 illumination Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
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- 238000004364 calculation method Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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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 invention relates to a photovoltaic power supply hybrid energy storage system which comprises a super capacitor, a storage battery pack, a backup energy storage system, three energy storage inductances, six IGBTs (Insulated Gate Bipolar Transistors) with antiparallel diodes and a state monitor. After the super capacitor is connected in series with a first energy storage inductance, one end of the super capacitor is connected with a cathode of a photovoltaic power supply DC (Direct Current) bus and the other end of the super capacitor is respectively connected with the cathode and an anode of the DC bus by a first IGBT and a second IGBT; after the storage battery pack is connected in series with a second energy storage inductance, one end of the storage battery pack is connected with the cathode of the DC bus and the other end of the storage battery pack is respectively connected with the cathode and the anode of the DC bus by a third IGBT and a fourth IGBT; and after the backup energy storage system is connected in series with a third energy storage inductance, one end of the backup energy storage system is connected with the cathode of the DC bus and the other end of the backup energy storage system is respectively connected with the cathode and the anode of the DC bus by a fifth IGBT and a sixth IGBT. According to the invention, the advantages of three types of energy storage units are complemented; power supply quality and utilization rate of light energy are improved; operating life of the system is effectively prolonged; and operating cost is reduced.
Description
Technical field
The present invention relates to a kind of mixed energy storage system for the adjustment of photovoltaic generating system running status, belong to technical field of power generation.
Background technology
Solar energy power generating is a kind of mode effectively utilizing solar energy, has in running and does not consume the advantages such as primary energy, pollution-free, noiseless, construction scale are changeable.But photovoltaic generating system has the poor shortcoming lower with the efficiency of light energy utilization in running of the produced quality of power supply, have impact on the practical application of photovoltaic power generation technology simultaneously.Occur that the main cause of these problems is that the generating capacity of photovoltaic cell can the equidirectional non-linear change along with the change of sunlight illumination, the changing inversely along with the change of temperature, and only have could Maximum Power Output when its generating capacity and load match.Because the situation of change of load is determined by user completely, and the output voltage of photo-voltaic power supply significantly can change along with the change of load, so rely on photo-voltaic power supply self cannot meet the requirement of conventional electric power user to power quality.This generating capacity feature that non-linear change and generating capacity cannot be mated with load with Environmental variations of photo-voltaic power supply, result in the efficiency of light energy utilization in system operation very low, the photovoltaic cost of electric energy is higher.A kind of effective ways solved the problem are the energy storage devices installing certain capacity in photovoltaic generating system, utilize energy storage device to improve the efficiency of light energy utilization in the power quality of photovoltaic generating system and running.
Current photovoltaic generating system generally adopts batteries to carry out energy storage, and when electricity generation system energy is sufficient, photo-voltaic power supply is the charging of energy storage battery group, and to power or to electrical network transmission of electric energy (networking operation mode) for power consumer; When electricity generation system energy shortage maybe cannot generate electricity, batteries is discharged for power consumer or electrical network continue to provide electric energy.Adopt batteries to carry out energy storage and there is certain defect, first there is electrochemical reaction in internal storage battery, and charge/discharge rates is slow; Secondly accumulator cell charging and discharging number of times is limited, and useful life is short, and discarded storage battery to environment, often can be changed storage battery and the photovoltaic cost of electric energy also can be made to increase further.Therefore, some researchers propose and the technology such as Flywheel energy storage technique, ultracapacitor energy storage technology, superconducting energy storage are applied to photovoltaic generating system, these energy storage technologies all have long service life, power density is large, charge/discharge rates is fast and the advantage of non-environmental-pollution, but they all exist again the shortcoming that energy storage density is low and cost is higher, replace batteries completely and be difficult to realize in engineering reality.In recent years, some researchers propose from the useful life of improving storage battery and storage battery and ultracapacitor are composed in parallel the method for mixed energy storage system by reactor, and carried out, to improve the running simulation study and part Experiment research that service lifetime of accumulator is target, obtaining improving the useful conclusion of the life of storage battery.In fact, continuous several days of photovoltaic generating system operating area situation sunny or cloudy and drizzly for days on end happens occasionally, simple dependence ultracapacitor and batteries meet the long-time demand continuing charge or discharge, very uneconomical from the viewpoint of the investment utilance of energy-storage system.Therefore, how to improve by most economical method time, the raising photovoltaic generating system power quality that mixed energy storage system continues charge or discharge, just become current the faced difficult problem of relevant technologies personnel.
Summary of the invention
The object of the invention is to the drawback for prior art, provide a kind of energy storage capacity large, have extended cycle life, fast response time, power handling capacity are strong, small investment and long photo-voltaic power supply mixed energy storage system of lasting charge or discharge time.
Problem of the present invention realizes with following technical proposals:
A kind of photo-voltaic power supply mixed energy storage system, formation comprises ultracapacitor, batteries, standby energy-storage system, three energy storage inductors, six IGBT with inverse parallel fast recovery diode and status monitor, a termination photo-voltaic power supply DC bus negative pole after described ultracapacitor is connected in series with the first energy storage inductor, the other end connects negative pole and the positive pole of photo-voltaic power supply DC bus respectively through an IGBT and the 2nd IGBT, a termination photo-voltaic power supply DC bus negative pole after described batteries is connected in series with the second energy storage inductor, the other end connects negative pole and the positive pole of photo-voltaic power supply DC bus respectively through the 3rd IGBT and the 4th IGBT, a termination photo-voltaic power supply DC bus negative pole after described standby energy-storage system is connected in series with the 3rd energy storage inductor, the other end connects negative pole and the positive pole of photo-voltaic power supply DC bus respectively through the 5th IGBT and the 6th IGBT,
Described photo-voltaic power supply mixed energy storage system operates as follows:
In photovoltaic generating system running, status monitor detects the DC bus-bar voltage of photo-voltaic power supply, ultracapacitor voltage, accumulator battery voltage and standby energy-storage system voltage in real time, and adjusts the running status of mixed energy storage system by the following method according to the monitor value of each voltage:
If the DC bus-bar voltage of photo-voltaic power supply is at its rated value
u n98% ~ 102% scope within, then original state of a control is constant;
When the DC bus-bar voltage of photo-voltaic power supply is lower than its rated value
u n98% time, if mixed energy storage system current be charged state, then reduce the charge power of energy-storage system; If mixed energy storage system is current is not charged state, then carry out Generation Control, the power that energy-storage system transmits to the DC bus of photo-voltaic power supply is increased;
When the DC bus-bar voltage of photo-voltaic power supply is higher than its rated value
u n102% time, if mixed energy storage system current be generating state, then reduce the generated output of mixed energy storage system; If mixed energy storage system is current is not generating state, carries out charging and control, photo-voltaic power supply is increased to the charge power of energy-storage system.
Above-mentioned photo-voltaic power supply mixed energy storage system, the method that mixed energy storage system is increased to the power that the DC bus of photo-voltaic power supply transmits is: the break-make duty ratio increment first controlling an IGBT, makes the power increase that ultracapacitor transmit to the DC bus of photo-voltaic power supply; If now super capacitor electrode forces down 0.2 times in its maximum operating voltage, then change the break-make duty ratio increment of control the 3rd IGBT into, the power that batteries is transmitted to the DC bus of photo-voltaic power supply is increased; If now accumulator battery voltage is less than its specified electricity 0.8 times of value, then change the break-make duty ratio increment of control the 5th IGBT into, make the power increase that energy-storage system for subsequent use transmits to the DC bus of photo-voltaic power supply.
Above-mentioned photo-voltaic power supply mixed energy storage system, the method that photo-voltaic power supply is increased to the charge power of mixed energy storage system is: the break-make duty ratio increment first controlling the 2nd IGBT, makes photo-voltaic power supply increase to the charge power of ultracapacitor; If now ultracapacitor voltage reaches its maximum operating voltage, then change the break-make duty ratio increment of control the 4th IGBT into, photo-voltaic power supply is increased to the charge power of batteries; If now accumulator battery voltage is greater than 1.3 times of its rated voltage, then change the break-make duty ratio increment of control the 6th IGBT into, photo-voltaic power supply is increased to the charge power of energy-storage system for subsequent use.
Above-mentioned photo-voltaic power supply mixed energy storage system, described standby energy-storage system is electrolytic hydrogen production-generating equipment.
Above-mentioned photo-voltaic power supply mixed energy storage system, when increasing the charge and discharge power of mixed energy storage system, each IGBT break-make duty ratio increment
computational methods be:
, wherein,
for photo-voltaic power supply DC bus-bar voltage,
k 1,
k 2for the positive coefficient relevant with the carrier frequency of control circuit to the voltage of DC bus rated voltage, current operation energy-storage units.
Above-mentioned photo-voltaic power supply mixed energy storage system, also comprises voltage stabilizing electrochemical capacitor in formation, and the positive pole of described voltage stabilizing electrochemical capacitor and negative pole connect positive pole and the negative pole of photo-voltaic power supply DC bus respectively.
Above-mentioned photo-voltaic power supply mixed energy storage system, is provided with fling-cut switch between energy-storage system and photo-voltaic power supply DC bus.
Ultracapacitor, batteries and standby energy-storage system organically combine and carry out cooperation control by the present invention, achieve the mutual supplement with each other's advantages of dissimilar energy-storage units.When photo-voltaic power supply normally runs, supply power voltage quality brings up to the fluctuation range of 2% ~ 3% from the excursion of about 25% when originally regulating without energy storage; The efficiency of light energy utilization improved nearly 50% more originally.The short-term imbalance power caused due to sunlight illumination frequent variations and load random fluctuation is by can the ultracapacitor of discharge and recharge more than 500,000 times is born, secular disequilibrium power born by standby energy-storage system, substantially prolongs the length of service of the shorter batteries of cycle life, the also configurable batteries compared with low capacity under the prerequisite improving quality of voltage and power supply reliability, reduces the comprehensive method of investment and the operation and maintenance cost of energy-storage system.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is system configuration schematic diagram of the present invention.
In figure, each symbol inventory is: GV, solar battery array, C1, ultracapacitor, B2, batteries, B3, standby energy-storage system, T0 ~ T5, an IGBT(insulated gate bipolar transistor) ~ the 6th IGBT, D0 ~ D5, the first fast recovery diode ~ the 6th fast recovery diode, L1 ~ L3, the first energy storage inductor ~ the 3rd energy storage inductor, C
p, voltage stabilizing electrochemical capacitor, D
p, counnter attack diode, DC/DC, photo-voltaic power supply MPPT maximum power point tracking controller, DC/AC, inverter, K, fling-cut switch,
u s, mixed energy storage system output voltage,
u pV, (its rated value is photo-voltaic power supply DC bus-bar voltage
u n),
u c1, ultracapacitor voltage,
u b2, accumulator battery voltage,
u b3, standby energy-storage system voltage.
Embodiment
They are divided three classes according to the essential characteristic such as response speed, power handling capacity, energy storage capacity, cycle life of various energy-storage system by the present invention.The first kind is the energy-storage systems such as ultracapacitor, flywheel, superconduction, and such energy-storage system has the advantage that fast response time, power handling capacity are strong, have extended cycle life, and has energy storage capacity little or carry out the very high inferior position of Large Copacity energy storage cost simultaneously.Equations of The Second Kind is various types of energy-storage system of accumulator, as lead acid accumulator, lithium ion battery etc., such energy-storage system generally possesses skills maturation, the lower-cost advantage of larger capacity energy storage, has the inferior position that response speed is medium, power handling capacity is medium, cycle life is shorter simultaneously.3rd class is for toggle speed is comparatively slow, can provide the standby energy storage device of electric energy and consumption electric energy for a long time, as electrolytic hydrogen production-generating equipment, the equipment etc. that combines with stand-by power supply without the load of quality requirement, this kind of energy-storage system can solve the electric energy that photovoltaic generating system continues and lack and overstock problem within the long time.Ultracapacitor, storage battery are become mixed energy storage system with the energy-storage units of standby energy-storage system three types by Technics of Power Electronic Conversion electrical combination by the present invention, this mixed energy storage system is utilized to regulate and control the running status of photo-voltaic power supply, solve a difficult problem for photovoltaic generating system power quality difference, improve the efficiency of light energy utilization in photo-voltaic power supply running simultaneously.
The present invention includes ultracapacitor C1, batteries B2, standby energy-storage system B3, three energy storage inductors (L1, L2, L3), six insulated gate bipolar transistors (T0, T1, T2, T3, T4, T5), six fast recovery diodes (D0, D1, D2, D3, D4, D5), voltage stabilizing electrochemical capacitor C
p, status monitor, fling-cut switch K.
In Fig. 1, photo-voltaic power supply comprises solar battery array GV, counnter attack diode D
p, DC/DC MPPT maximum power point tracking controller, DC/AC inverter, DC bus.DC bus in photovoltaic generating system is linked together by the output of fling-cut switch K and mixed energy storage system.
When K switch disconnects, mixed energy storage system does not participate in controlling, because the change of sunlight, temperature, load cannot be avoided, and DC bus-bar voltage
u pVbe difficult to operate in the stable operating point that meets quality of voltage standard; In addition, because the generating capacity of solar battery array cannot be mated with the electric power of user or electrical network, the effect of DC/DC MPPT maximum power point tracking controller cannot be brought into play, illumination comparatively good times volt power supply " light can only be abandoned " run, the efficiency of light energy utilization of system is lower.
K switch closed, mixed energy storage system participates in photovoltaic generating system and runs control.In system operation, status monitor detects the voltage of photovoltaic generating system DC bus in real time
u pV, ultracapacitor voltage
u c1, batteries voltage
u b2with the voltage of standby energy-storage system
u b3calculate each energy-storage units of mixed energy storage system fast and run control strategy, by the running status of six insulated gate bipolar transistors (T0, T1, T2, T3, T4, T5) in result of calculation real-time control circuit, ultracapacitor, batteries and standby energy-storage system time-division operation are released in charging energy-storing state or generating can state.Under the effect charge in order at mixed energy storage system, generated electricity, no matter how sunlight, temperature, load change, DC bus-bar voltage
u pVall the time the steady operation region meeting quality of voltage standard is operated in; Simultaneously, because the generating capacity of solar battery array remains matching status with the total electric power comprising mixed energy storage system, the effect total energy of DC/DC MPPT maximum power point tracking controller is normal to be played, no matter how illumination changes, photovoltaic battery array can operate in maximum power output state, the running status of system obtains Effective Regulation, and the efficiency of light energy utilization is improved.
The present invention, according to the ruuning situation of DC bus-bar voltage in photovoltaic generating system, to charge to the mixed energy storage system be made up of ultracapacitor, batteries and standby energy-storage system, optimum control for generation in order, and this control method is carried out according to following steps:
A. status monitor detects photo-voltaic power supply DC bus-bar voltage in real time
u pV, ultracapacitor voltage
u c1, batteries voltage
u b2, standby energy-storage system voltage
u b3, real-time judge goes out the generating of each energy-storage units in mixed energy storage system and charging bearing capacity.
B. DC bus-bar voltage is judged
u pVwhether operate in rated voltage
u n98% ~ 102% scope within, if meet quality requirement, original state of a control is constant, proceed A step operation.
If C. DC bus-bar voltage
u pVdo not meet quality requirement, namely 98%
u n~ 102%
u nbeyond scope, then carry out following corresponding operating 1. or 2..
If 1.
u pVlower than 98%
u n, judge mixed energy storage system current whether be charged state, be that charged state then reduces charging duty cycle to reduce the charge power of mixed energy storage system, then return steps A.That charged state then carries out Generation Control, first control IGBT(and T0) break-make duty ratio increment ultracapacitor is increased to DC bus through-put power; If now ultracapacitor does not possess generating bearing capacity, namely
u c1lower than 0.2 times of its maximum operating voltage, then change control the 3rd IGBT(and T2 into) break-make duty ratio increment batteries is increased to the through-put power of DC bus; If now batteries does not possess generating bearing capacity, namely
u b2be less than 0.8 times of its rated value, then change control the 5th IGBT(and T4 into) break-make duty ratio increment energy-storage system for subsequent use is increased to the through-put power of DC bus.Finally turn back to the operation of A step.
If 2.
u pVhigher than 102%
u n, judge mixed energy storage system current whether be generating state, be generating state then reduce generating duty ratio to reduce the generated output of mixed energy storage system, then return steps A.Be not generating state then carry out charging control, first control the 2nd IGBT(and T1) break-make duty ratio increment photo-voltaic power supply is increased to the charge power of ultracapacitor; If now ultracapacitor does not possess charging bearing capacity, namely
u c1reach its maximum operating voltage, then change control the 4th IGBT(and T3 into) break-make duty ratio increment photo-voltaic power supply is increased to the charge power of batteries; If now batteries does not possess charging bearing capacity, namely
u b2be greater than 1.3 times of its rated value, then change control the 6th IGBT(and T5 into) break-make duty ratio increment, photo-voltaic power supply is increased to the charge power of energy-storage system for subsequent use.Finally turn back to the operation of A step.
D. in mixed energy storage system charge and discharge control process, priority during three class energy-storage units generatings is: ultracapacitor-batteries-standby energy-storage system; Priority during charging is similarly: ultracapacitor-batteries-standby energy-storage system.Duty ratio incremental calculation method is:
,
k 1,
k 2for the positive coefficient relevant with the carrier frequency of control circuit to the voltage of DC bus rated voltage, current operation energy-storage units.
This control sequence achieves the mutual supplement with each other's advantages of dissimilar energy-storage units easily, effectively extends the length of service of mixed energy storage system, reduces energy-storage system investment and maintenance cost.Controlled by the orderly generating to three class energy-storage units in mixed energy storage system, charging, the unbalanced power problem between the generators and loads in photovoltaic generating system is resolved, and the stability of DC bus-bar voltage is effectively controlled.Photo-voltaic power supply under any circumstance all can send electric energy with its maximum generation ability, and its efficiency of light energy utilization obtains effective raising.
As can be seen here, no matter be the photovoltaic generating system of independent operating or the photovoltaic generating system of networking operation, as long as this mixed energy storage system is arranged on photovoltaic generating system DC bus, according to mixed energy storage system control method of the present invention, stability contorting is carried out to DC bus-bar voltage, photo-voltaic power supply running status will be adjusted automatically, both ensure that the power quality of power consumer, turn improve the efficiency of light energy utilization of photo-voltaic power supply, reduce the photovoltaic cost of electric energy, also can extend the operation time limit of mixed energy storage system.
Claims (6)
1. a photo-voltaic power supply mixed energy storage system, it is characterized in that, described energy-storage system comprises ultracapacitor (C1), batteries (B2), standby energy-storage system (B3), three energy storage inductors, six IGBT with inverse parallel fast recovery diode and status monitor, a termination photo-voltaic power supply DC bus negative pole after described ultracapacitor (C1) is connected in series with the first energy storage inductor (L1), the other end is respectively through an IGBT(T0) and the 2nd IGBT(T1) connect negative pole and the positive pole of photo-voltaic power supply DC bus, a termination photo-voltaic power supply DC bus negative pole after described batteries (B2) is connected in series with the second energy storage inductor (L2), the other end is respectively through the 3rd IGBT(T2) and the 4th IGBT(T3) connect negative pole and the positive pole of photo-voltaic power supply DC bus, a termination photo-voltaic power supply DC bus negative pole after described standby energy-storage system (B3) is connected in series with the 3rd energy storage inductor (L3), the other end is respectively through the 5th IGBT(T4) and the 6th IGBT(T5) connect negative pole and the positive pole of photo-voltaic power supply DC bus,
Described photo-voltaic power supply mixed energy storage system operates as follows:
In photovoltaic generating system running, status monitor detects the DC bus-bar voltage of photo-voltaic power supply, ultracapacitor voltage, accumulator battery voltage and standby energy-storage system voltage in real time, and adjusts the running status of mixed energy storage system by the following method according to the monitor value of each voltage:
If the DC bus-bar voltage of photo-voltaic power supply is at its rated value
u n98% ~ 102% scope within, then original state of a control is constant;
When the DC bus-bar voltage of photo-voltaic power supply is lower than its rated value
u n98% time, if mixed energy storage system current be charged state, then reduce the charge power of energy-storage system; If mixed energy storage system is current is not charged state, then carry out Generation Control, the power that energy-storage system transmits to the DC bus of photo-voltaic power supply is increased;
When the DC bus-bar voltage of photo-voltaic power supply is higher than its rated value
u n102% time, if mixed energy storage system current be generating state, then reduce the generated output of mixed energy storage system; If mixed energy storage system is current is not generating state, carries out charging and control, photo-voltaic power supply is increased to the charge power of energy-storage system;
The method that mixed energy storage system is increased to the power that the DC bus of photo-voltaic power supply transmits is: first control an IGBT(T0) break-make duty ratio increment, make the power increase that ultracapacitor (C1) transmit to the DC bus of photo-voltaic power supply; If now super capacitor electrode forces down 0.2 times in its maximum operating voltage, then change control the 3rd IGBT(T2 into) break-make duty ratio increment, the power that batteries (B2) is transmitted to the DC bus of photo-voltaic power supply is increased; If now accumulator battery voltage is less than 0.8 times of its rated value, then change control the 5th IGBT(T4 into) break-make duty ratio increment, the power that energy-storage system for subsequent use transmits to the DC bus of photo-voltaic power supply is increased.
2. a kind of photo-voltaic power supply mixed energy storage system according to claim 1, it is characterized in that, the method that photo-voltaic power supply is increased to the charge power of mixed energy storage system is: first control the 2nd IGBT(T1) break-make duty ratio increment, photo-voltaic power supply is increased to the charge power of ultracapacitor (C1); If now ultracapacitor voltage reaches its maximum operating voltage, then change control the 4th IGBT(T3 into) break-make duty ratio increment, photo-voltaic power supply is increased to the charge power of batteries (B2); If now accumulator battery voltage is greater than 1.3 times of its rated voltage, then change control the 6th IGBT(T5 into) break-make duty ratio increment, photo-voltaic power supply is increased to the charge power of energy-storage system for subsequent use.
3. a kind of photo-voltaic power supply mixed energy storage system according to claim 2, is characterized in that, described standby energy-storage system (B3) is electrolytic hydrogen production-generating equipment.
4. a kind of photo-voltaic power supply mixed energy storage system according to claim 3, is characterized in that, when increasing the charge and discharge power of mixed energy storage system, and each IGBT break-make duty ratio increment
computational methods be:
, wherein,
for photo-voltaic power supply DC bus-bar voltage,
k 1,
k 2for the positive coefficient relevant with the carrier frequency of control circuit to the voltage of DC bus rated voltage, current operation energy-storage units.
5. a kind of photo-voltaic power supply mixed energy storage system according to claim 4, is characterized in that, also comprises voltage stabilizing electrochemical capacitor (C in formation
p), described voltage stabilizing electrochemical capacitor (C
p) positive pole and negative pole connect positive pole and the negative pole of photo-voltaic power supply DC bus respectively.
6. a kind of photo-voltaic power supply mixed energy storage system according to claim 5, is characterized in that, is provided with fling-cut switch (K) between energy-storage system and photo-voltaic power supply DC bus.
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