CN107733065A - Photo-voltaic power supply mixed energy storage system and its energy management method under low-light conditions - Google Patents
Photo-voltaic power supply mixed energy storage system and its energy management method under low-light conditions Download PDFInfo
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- CN107733065A CN107733065A CN201711147479.1A CN201711147479A CN107733065A CN 107733065 A CN107733065 A CN 107733065A CN 201711147479 A CN201711147479 A CN 201711147479A CN 107733065 A CN107733065 A CN 107733065A
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- energy
- power supply
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- battery
- residual capacity
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
Abstract
The invention discloses photo-voltaic power supply mixed energy storage system and its energy management method under a kind of low-light conditions.The system includes photovoltaic battery panel, one or two two-way DC DC converters, hybrid accumulator, wherein photovoltaic battery panel forms photo-voltaic power supply by connection in series-parallel, the direct current of photo-voltaic power supply output directly feeds the load on dc bus by DC DC, and hybrid energy-storing is by two-way DC DC converters and in photovoltaic electric source.The energy management method uses Hysteresis control strategy.The present invention under low lighting conditions, the efficiency of photovoltaic generation is improved by energy storage compensation, while the DC energy of solar energy output also can be supplied to energy storage device charging after workload demand is met；And solve the problems, such as that oscillation of power occurs in energy storage under Traditional control strategy.
Description
Technical field
The present invention relates to photo-voltaic power supply technology, more particularly to photo-voltaic power supply mixed energy storage system under a kind of low-light conditions
And its energy management method.
Background technology
In lack of energy and today of problem of environmental pollution getting worse, solar energy is as a kind of cleanliness without any pollution, supply
Persistently, widely distributed novel energy is turned into field of renewable energy by the extensive concern of countries in the world, photovoltaic generation
Most large-scale develop and utilize one of generation mode of prospect.
Photovoltaic generating system output characteristics is had a great influence by natural light irradiation, and natural light illumination has necessarily random
Property, under the low illumination meteorological condition such as dusk, wet weather, haze, because solar illumination is relatively low, output power of photovoltaic module is relatively low,
Particularly when photovoltaic battery panel output current is not enough to start DC-DC converter, photovoltaic generating system exports without electric energy, causes
The electric energy of photovoltaic battery panel conversion can not export, and then cause " abandoning light " phenomenon to occur.In order to solve this problem, photovoltaic is lifted
Generating efficiency, prior art are generally added energy storage device using in photovoltaic side, so that energy has schedulability, i.e., can either
Meet the energy release under low-light conditions, disclosure satisfy that collection of energy when energy is plentiful again.But the species of energy storage device
Have a lot, the problems such as cost is high, volume is big, short life be present using single energy storage device, how to select suitable energy storage device
The study hotspot of people is turned into.
During energy-storage system residual capacity exception, conventional energy management algorithm will be operated pattern switching.For example, work as electric power storage
Pond residual capacity is normal, and when super capacitor residual capacity is relatively low, super capacitor can be switched to charge by conventional energy management algorithm
Pattern.If energy-storage system is discharged with invariable power, and super capacitor initial residual capacity is relatively low, using conventional energy management algorithm then
Super capacitor charge mode is first switched to, will be lost in super capacitor this period of charging and absorb or discharge high frequency power
Ability.When super capacitor residual capacity recovers normal, because whole energy-storage system is still in discharge mode, therefore super capacitor
Electric discharge, residual capacity reduce, and can so produce vibration repeatedly, it is impossible to consider energy-storage system residual capacity, distributed electrical
Source output is strong and weak.
The content of the invention
It is an object of the invention to provide a kind of photo-voltaic power supply and the structure design mode of energy storage and its energy pipe of energy storage
Adjustment method, photovoltaic generation still can be effectively utilized under low lighting conditions so as to realize.
The technical solution for realizing the object of the invention is：One kind is based on photo-voltaic power supply hybrid energy-storing system under low-light conditions
System, including photovoltaic battery panel, one or two bidirectional DC-DC converter, hybrid accumulator, wherein photovoltaic battery panel pass through string
Photo-voltaic power supply is composed in parallel, the direct current of photo-voltaic power supply output directly feeds the load on dc bus, mixing storage by DC-DC
Can be by bidirectional DC-DC converter and in photovoltaic electric source.During illumination abundance, the direct current of photo-voltaic power supply output is meeting load
After demand, hybrid energy-storing charging is also can be supplied to, when under low-light conditions, hybrid energy-storing is mended by electric discharge to photo-voltaic power supply
Repay, in night, rainy weather, hybrid energy-storing, which can also individually generate electricity, meets workload demand.
The hybrid energy-storing energy management method of photo-voltaic power supply mixed energy storage system, using Hysteresis control, it is specially：Work as electric power storage
Just enter high residual capacity section when pond charges to residual capacity higher than 90%, and battery is discharged to from high residual capacity section
Residual capacity just enters normal interval below 80%；Residual capacity is charged to from low residual capacity section higher than more than 35% to enter
Normal residual capacity section, and be discharged to residual capacity from normal interval and enter low residual capacity section less than 25%；When super
Electric capacity enters high residual capacity section when charging to residual capacity higher than 95%, and residual capacity is discharged to from high residual capacity section
Less than 85% enters normal interval, and charging to residual capacity from low residual capacity section enters normal remaining appearance higher than more than 25%
Section is measured, and is discharged to residual capacity from normal interval and enters low residual capacity section less than 15%；When battery or super electricity
When appearance residual capacity is in low residual capacity section, battery or super capacitor are charged in a manner of invariable power or constant current,
After residual capacity returns to normal interval, normal mode is again switched to.
The present invention compared with prior art, its remarkable advantage：(1) present system uses active parallel-connection structure, ensures
When photovoltaic module output energy is relatively low, its electric energy can be output to load-side, improve photovoltaic module under low-light conditions
Utilization rate.(2) for present system energy storage device by the way of ferric phosphate lithium cell and super capacitor hybrid energy-storing, the two is mutual
Coordinate, there is high economy and good reliability.(3) energy-storage system SOC of the present invention uses Hysteresis control strategy, avoids energy storage
System is in Traditional control strategy lower change point oscillation problem.
Brief description of the drawings
Fig. 1 is photovoltaic energy storage system electrification structure figure.
Fig. 2 is mixed energy storage system structure chart.
Fig. 3 is traditional energy storage control strategy
Fig. 4 is remaining battery capacity section Hysteresis control figure.
Fig. 5 is super capacitor residual capacity section Hysteresis control figure.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
1st, the design of photovoltaic power generation system structure
As shown in figure 1, based on photo-voltaic power supply mixed energy storage system under low-light conditions, including photovoltaic battery panel, one or
Two bidirectional DC-DC converters, hybrid accumulators, wherein photovoltaic battery panel form photo-voltaic power supply, photovoltaic electric by connection in series-parallel
The direct current of source output directly feeds load on dc bus by DC-DC, hybrid energy-storing by bidirectional DC-DC converter simultaneously
In photovoltaic electric source.During illumination abundance, the direct current of photo-voltaic power supply output also can be supplied to mixing storage after workload demand is met
Can charging, when under low-light conditions, hybrid energy-storing is compensated by electric discharge to photo-voltaic power supply, in night, rainy weather, is mixed
Close energy storage and can also individually generate electricity and meet workload demand.
2nd, the selection of energy storage device
Energy storage device has energy density using super capacitor and the hybrid energy-storing of battery, wherein ferric phosphate lithium cell
High, low cost and other advantages, but charging current is small, time constant is big；And the power density of super capacitor is high, charging and discharging currents
Greatly, fast response time, but it is on the high side.In view of factors such as economy, reliabilities, the system is using ferric phosphate lithium cell and surpasses
The mode of level electric capacity hybrid energy-storing.
A variety of energy storing structures are can obtain by the way that two kinds of energy-storage travelling wave tubes are carried out into different combinations, power network is such as directly accessed, leads to
Inductance or power converter access power network are crossed, concrete structure is as shown in Figure 2.
Fig. 2 (a) is that ferric phosphate lithium cell accesses power network by converter, and the structure is easy to super capacitor to dc bus energy
Amount carries out quickly supplement and dynamic memory, can reduce the power swing that battery undertakes, be advantageous to prolonging service life of battery.But
So require the ultracapacitor of configuration larger capacity, the increase of energy storage cost；
Fig. 2 (b) is that ultracapacitor accesses power network by converter, although the structure is defeated by the constant pressure of reversible transducer
Go out control and solve the problems, such as that ultracapacitor terminal voltage changes greatly to bring, but battery tension and DC bus-bar voltage need to be
Same grade, and battery still will undertake certain high frequency electric fluctuation；
Fig. 2 (c) is that ferric phosphate lithium cell and ultracapacitor access power network by converter, and the structure can be by reasonable
The control strategy of design transformation device, the size of two energy storage device input/output power is controlled, to meet system to energy storage device
The requirement of power output, there is the characteristics of high efficient and flexible；
Fig. 2 (d) is that ferric phosphate lithium cell is grid-connected with ultracapacitor by converter, then accesses power network, ultracapacitor
Can fast charging and discharging, the structure is suitable for the load that power frequently fluctuates widely, and ferric phosphate lithium cell is defeated by converter
Power transmission energy, you can be charged to ultracapacitor, also can provide electric energy to power network, power supply mode is flexible.
3rd, energy-storage system energy management algorithm
During energy-storage system residual capacity exception, conventional energy management algorithm will be operated pattern switching.For example, work as electric power storage
Pond residual capacity is normal, and (M when super capacitor residual capacity is relatively lowNLPattern), conventional energy management algorithm can be by super capacitor
Switch to charge mode, as shown in Figure 3.Now super capacitor will be charged in a manner of invariable power or constant current, lose absorption
Or the ability of release high frequency power, and after residual capacity returns to normal interval, it will again handoff to normal mode.
If energy-storage system is discharged with invariable power, and super capacitor initial residual capacity is relatively low, is calculated using conventional energy management
Rule first switches to super capacitor charge mode, and absorption or release high frequency work(will be lost in super capacitor this period of charging
The ability of rate.When super capacitor residual capacity recovers normal, because whole energy-storage system is still in discharge mode, therefore it is super
Electric capacity discharges, and residual capacity reduces, and can so produce vibration repeatedly.
To avoid energy-storage system from producing vibration in critical point, the present invention uses Hysteresis control, electric power storage for energy-storage system SOC
Pond and super capacitor residual capacity section hysteresis control method thereof are respectively as shown in accompanying drawing 4, accompanying drawing 5.According to battery and super electricity
Hold residual capacity, set three sections, respectively between high volume zone, normal capacity section and low capacity section, when battery fills
Between electricity to residual capacity enters high volume zone when being higher than 90%, enter just from residual capacity is discharged between high volume zone below 80%
Chang Rongliang sections, it is discharged to residual capacity from normal capacity section and enters low capacity section less than 25%, filled from low capacity section
Electricity enters normal capacity section to residual capacity higher than more than 35%；Enter when super capacitor charges to residual capacity higher than 95%
Between entering high volume zone, enter normal capacity section below 85% from residual capacity is discharged between high volume zone, from normal capacity area
Between be discharged to residual capacity and enter low capacity section less than 15%, charge to residual capacity higher than more than 25% from low capacity section
Into normal capacity section.By battery and the definition in super capacitor residual capacity difference section, the mode of operation of energy-storage system
M can be divided intoLL、MLN、MLH、MNL、MNN、MNH、MHL、MHN、MHHNine kinds of patterns, it is as shown in the table.
The energy-storage system mode of operation table of table 1
Claims (5)
1. one kind be based on low-light conditions under photo-voltaic power supply mixed energy storage system, it is characterised in that including photovoltaic battery panel, one
Or two bidirectional DC-DC converters, hybrid accumulators, wherein photovoltaic battery panel form photo-voltaic power supply, photovoltaic by connection in series-parallel
The direct current of power supply output directly feeds the load on dc bus by DC-DC, and hybrid energy-storing passes through bidirectional DC-DC converter
And in photovoltaic electric source.
2. according to claim 1 be based on photo-voltaic power supply mixed energy storage system under low-light conditions, it is characterised in that described
Hybrid accumulator includes battery and super capacitor.
3. according to claim 2 be based on photo-voltaic power supply mixed energy storage system under low-light conditions, it is characterised in that described
Battery is ferric phosphate lithium cell.
4. according to claim 2 be based on photo-voltaic power supply mixed energy storage system under low-light conditions, it is characterised in that according to
The number of bidirectional DC-DC converter, and the various combination with two kinds of energy-storage travelling wave tubes, four kinds of energy-storage systems are obtained, be respectively：
1) there was only the situation of a bidirectional DC-DC converter：
Battery is by converter and direct and in photovoltaic electric source in photovoltaic electric source, super capacitor；
Ultracapacitor is by converter and direct and in photovoltaic electric source in photovoltaic electric source, battery；
2) there is the situation of two bidirectional DC-DC converters：
Battery and ultracapacitor are respectively by correspondent transform device and in photovoltaic electric source；
Battery is by converter and ultracapacitor and company, then and in photovoltaic electric source.
5. based on the hybrid energy-storing energy management method of claim 1-4 any one photo-voltaic power supply mixed energy storage systems, it is special
Sign is, according to battery and super capacitor residual capacity, sets three sections, respectively between high volume zone, normal capacity area
Between and low capacity section, when battery charge to residual capacity higher than 90% when enter high volume zone between, put between high volume zone
Electricity to residual capacity enters normal capacity section below 80%, be discharged to residual capacity from normal capacity section enters less than 25%
Low capacity section, charge to residual capacity from low capacity section and enter normal capacity section higher than more than 35%；Work as super capacitor
Enter when charging to residual capacity higher than 95% between high volume zone, enter from residual capacity is discharged between high volume zone below 85%
Normal capacity section, it is discharged to residual capacity from normal capacity section and enters low capacity section less than 15%, from low capacity section
Charge to residual capacity and enter normal capacity section higher than more than 25%；When battery or super capacitor residual capacity are in low appearance
When measuring section, battery or super capacitor are charged in a manner of invariable power or constant current, when residual capacity returns to normal appearance
After measuring section, normal mode is again switched to.
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| CN201711147479.1A CN107733065A (en) | 2017-11-17 | 2017-11-17 | Photo-voltaic power supply mixed energy storage system and its energy management method under low-light conditions |
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| CN201711147479.1A CN107733065A (en) | 2017-11-17 | 2017-11-17 | Photo-voltaic power supply mixed energy storage system and its energy management method under low-light conditions |
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