CN103956821A - Mixed distribution system and control method for energy storage modules for photovoltaic power generation - Google Patents

Mixed distribution system and control method for energy storage modules for photovoltaic power generation Download PDF

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Publication number
CN103956821A
CN103956821A CN201410151740.5A CN201410151740A CN103956821A CN 103956821 A CN103956821 A CN 103956821A CN 201410151740 A CN201410151740 A CN 201410151740A CN 103956821 A CN103956821 A CN 103956821A
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China
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lead
energy
acid batteries
switch
lithium battery
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CN201410151740.5A
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CN103956821B (en
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章旭敏
黄大就
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ZHEJIANG LANGCHENG SUSTAINABLE ENERGY Co Ltd
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ZHEJIANG LANGCHENG SUSTAINABLE ENERGY Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a mixed distribution system and a control method for energy storage modules for photovoltaic power generation. The mixed distribution system comprises multiple battery packs, two-way energy storage inverters, double-end two-way energy storage inverters, an AC distribution switch, a master control system, a data acquisition unit and a diesel generator. According to signals of the data acquisition unit, the master control system can control a switch K1 to be turned on, so that lead-acid storage battery packs and lithium battery packs are connected with a transformer through the two-way energy storage inverters and the double-end two-way energy storage inverters respectively, finally inversion and electricity generation are conducted, and electricity is supplied to a power grid; the electricity in the power grid can also be used for reversely charging the lead-acid storage battery packs and the lithium battery packs. The diesel generator can also charge the lead-acid storage battery packs and the lithium battery packs or supply electricity to the power grid. The mixed distribution system has the advantages of being reasonable in structure, convenient to maintain and high in cost performance, and the comprehensive cost of the mixed distribution system is lower than the cost of using only one kind of batteries.

Description

Energy-storage module mixing preparation system and the control method thereof of photovoltaic generation
Technical field
The present invention relates to a kind of energy-storage module mixing preparation system and control method thereof of photovoltaic generation.
 
Background technology
Energy-storage system is an important composition part in photovoltaic off-grid electricity generation system, mainly bears the storage of electric energy, ensures the electric power supply of evening and rainy weather, is also a maximum part of photovoltaic off-grid power station investment.Existing energy-storage system generally adopts lead acid accumulator as main memory device, and the proportional quantity of storage battery generally carries out proportioning by the 1:8 with photovoltaic scale or 1:10, and this just need to configure a large amount of storage batterys, and cost of investment is huge.Larger pure from net project of some loads particularly, when the energy output of photovoltaic cannot meet loading demand, be stablizing of proof load, energy storage battery will discharge electric energy for load, and the process of this release is just equivalent to the process that once recycles of storage battery.Or sunlight blocked by cloud, when photovoltaic power generation quantity can not meet the use of load, energy storage battery can discharge again electric weight for load, and this is again the process once recycling.And the service life cycle of lead acid accumulator is 600 left and right, so as adopt existing energy storage technology, this heavy load, pure off-grid project, energy-storage system is less than scrapping half a year, lead acid accumulator is changed again again.
 
Summary of the invention
In order to solve prior art in the pure defect in net project of heavy load, the present invention adopts lithium battery, lead acid accumulator hybrid power supply, and a kind of energy-storage module mixing preparation system of photovoltaic generation is provided.
Technical scheme of the present invention is:
An energy-storage module mixing preparation system for photovoltaic generation, comprising:
A plurality of battery pack, these battery pack comprise lead-acid batteries and lithium battery group;
Bidirectional energy-storage inverter, its DC terminal connects lead-acid batteries;
Both-end bidirectional energy-storage inverter, its DC terminal connects lithium battery group;
Exchange allotment switch, an end points K11 of its K switch 1 is connected to the interchange end B of bidirectional energy-storage inverter, an end points K21 of K switch 2 is connected to second of both-end bidirectional energy-storage inverter and exchanges end A2, and another end points K12 of K switch 1 is connected with another end points K22 of K switch 2 by transformer to electrical network;
Master control system, for controlling the operating state that exchanges allotment switch, meanwhile, master control system is connected with the data port of both-end bidirectional energy-storage inverter with bidirectional energy-storage inverter by data wire;
Data acquisition unit, the input of this data acquisition unit connects respectively network load monitor and photovoltaic power generation equipment monitor, and the output of this data acquisition unit is connected to master control system;
Network load monitor for detection of the various electrical quantitys of network load as electric current, voltage and power etc., photovoltaic power generation equipment monitor for the various electrical quantitys of monitoring photovoltaic power generation equipment as output current, voltage and power etc.;
Diesel engine generator, is connected with the public point of K2 in interchange allotment switch;
According to the signal of data acquisition unit, master control system energy control switch K1 conducting, lead-acid batteries through bidirectional energy-storage inverter and lithium battery group respectively through both-end bidirectional energy-storage inverter to transformer, the final inversion electrical network that generates electricity, also the electricity on electrical network oppositely can be charged to lead-acid batteries and lithium battery group, when the public point of K2 is connected to the end points K21 of K switch 2, diesel generation function exchanges end A2 through second of both-end bidirectional energy-storage inverter lithium battery group is charged, simultaneously also can be by the second interchange end A2 through the first interchange end A1, the interchange end B of bidirectional energy-storage inverter charges to lead-acid batteries.
As preferably, the impulse electricity number of times of described lead-acid batteries is less than described lithium battery group impulse electricity number of times.
The invention also discloses a kind of control method of energy-storage module mixing preparation system of photovoltaic generation, control as follows.
A, according to the size of mains supply amount, divide stable power-supplying period, fluctuation power supply period;
B, stable power-supplying period are main power supply by lead-acid batteries, lithium battery group supplementary power;
The fluctuation power supply period is main power supply by lithium battery group, and insufficient section is by lead-acid batteries supplementary power;
As preferably, the electric discharge of described lead-acid batteries can intermittent discharge, and the electricity time of rushing of this lead-acid batteries presets.Conventionally, lead-acid batteries as required can multiple discharge, but only rushes once electricity every day; Can also be, lead-acid batteries can intermittently be rushed electricity as required, but continuous discharge every day once.
It should be noted that, the present invention is matching used with photovoltaic, stable power-supplying period, fluctuation power supply period are relative, this can be with reference to historical data as basic foundation, variation in conjunction with weather, period is divided, for example night, power supply can be divided into the stable power-supplying period, and the time on daytime can be divided into the fluctuation power supply period.
This cover system is given full play to the advantages characteristic of various batteries, utilize the discharging and recharging often of lithium battery, the characteristic such as electric current fast charging and discharging greatly, using lithium battery as electrokinetic cell, mainly solve photovoltaic generation and affected by Changes in weather, life problems when prolongation battery constantly discharges and recharges.And lead-acid battery is as main power supply storage battery, neither all discharge and recharge by all lead-acid batteries, but according to the situation of load, packet classification regulation and control, load needs great electric weight, just allow the lead-acid battery work of much electric weight, other lead-acid batteries, in resting state, have so just greatly reduced the cycle-index of lead-acid battery, have extended the useful life of lead-acid battery, thereby the renewal cost that has reduced lead-acid battery, has improved economic benefit.
That the present invention has is rational in infrastructure, integrated cost is than using the beneficial effect that single battery reduces, easy to maintenance, the ratio of performance to price is high.
 
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
 
Embodiment
Now the present invention is further illustrated by reference to the accompanying drawings:
As shown in the figure, a kind of energy-storage module mixing preparation system of photovoltaic generation, comprising:
A plurality of battery pack, these battery pack comprise lead-acid batteries and lithium battery group;
Bidirectional energy-storage inverter, its DC terminal connects lead-acid batteries;
Both-end bidirectional energy-storage inverter, its DC terminal connects lithium battery group;
Exchange allotment switch, an end points K11 of its K switch 1 is connected to the interchange end B of bidirectional energy-storage inverter, an end points K21 of K switch 2 is connected to second of both-end bidirectional energy-storage inverter and exchanges end A2, and another end points K12 of K switch 1 is connected with another end points K22 of K switch 2 by transformer to electrical network;
Master control system, for controlling the operating state that exchanges allotment switch, meanwhile, master control system is connected with the data port of both-end bidirectional energy-storage inverter with bidirectional energy-storage inverter by data wire;
Data acquisition unit, the input of this data acquisition unit connects respectively network load monitor and photovoltaic power generation equipment monitor, and the output of this data acquisition unit is connected to master control system;
Network load monitor for detection of the various electrical quantitys of network load as electric current, voltage and power etc., photovoltaic power generation equipment monitor for the various electrical quantitys of monitoring photovoltaic power generation equipment as output current, voltage and power etc.
Diesel engine generator, is connected with the public point of K2 in interchange allotment switch;
According to the signal of data acquisition unit, master control system energy control switch K1 conducting, lead-acid batteries through bidirectional energy-storage inverter and lithium battery group respectively through both-end bidirectional energy-storage inverter to transformer, the final inversion electrical network that generates electricity, also the electricity on electrical network oppositely can be charged to lead-acid batteries and lithium battery group, when the public point of K2 is connected to the end points K21 of K switch 2, diesel generation function exchanges end A2 through second of both-end bidirectional energy-storage inverter lithium battery group is charged, simultaneously also can be by the second interchange end A2 through the first interchange end A1, the interchange end B of bidirectional energy-storage inverter charges to lead-acid batteries, diesel engine generator can also be directly connected to electrical network and power to the load.
The impulse electricity number of times of lead-acid batteries is less than described lithium battery group impulse electricity number of times.
Below in conjunction with accompanying drawing, further introduce specific embodiment:
By day the period, when photovoltaic generation can not meet load, preferential lithium battery group is generated electricity, then regulates by lead-acid batteries.Such as photovoltaic power generation quantity is 150kwh, and load use amount is 200kwh, and unnecessary 50kwh electric weight is just regulated by lithium battery group and lead-acid batteries.According to above-mentioned situation, as long as suitably open corresponding battery pack, how many electric weight are opened corresponding battery pack number as required, and lithium battery is preferential.As photovoltaic generation has the electric energy of surplus, first give lead acid battery charge, then lithium battery group is charged.
At night the period, because photovoltaic is not generated electricity, main power supply unit completes power supply by 4 lead-acid batteries, and all the other 2 lithium battery battery groups therefrom regulate, and makes for electric equilibrium.Lead-acid batteries for power supply is also not necessarily all opened, but determines corresponding unlatching group number according to load use amount.Selectively open, for example, first start the batteries that there is no unlatching daytime, the not enough principle increasing again.
If daytime, battery pack was not full of, do not supply the load in evening.At this moment system will be switched to mainly and be powered by diesel engine unit, also gives each batteries charging simultaneously.
Each battery pack can be intersected to stagger the time and discharged and recharged, as long as rationally regulate and distribute discharging and recharging of each battery pack, just can make the number of times that discharges and recharges of each lead-acid batteries maintain once a day, thereby greatly extend the life-span of the use of lead-acid batteries.
4 lead-acid batteries also can be selected 2 common lead-acid batteries, select tubular colloidal battery pack for another 2, common lead-acid batteries is the most cheap battery pack, lead-acid batteries also can be intersected to stagger the time with tubular colloidal battery pack and discharged and recharged, further performance and price optimization, the impulse electricity number of times of common lead-acid batteries is less than the impulse electricity number of times of tubular colloidal battery pack, and the impulse electricity number of times of tubular colloidal battery pack is less than described lithium battery group impulse electricity number of times.

Claims (5)

1. an energy-storage module mixing preparation system for photovoltaic generation, is characterized in that, comprising:
A plurality of battery pack, these battery pack comprise lead-acid batteries and lithium battery group;
Bidirectional energy-storage inverter, its DC terminal connects lead-acid batteries;
Both-end bidirectional energy-storage inverter, its DC terminal connects lithium battery group;
Exchange allotment switch, an end points K11 of its K switch 1 is connected to the interchange end B of bidirectional energy-storage inverter, an end points K21 of K switch 2 is connected to second of both-end bidirectional energy-storage inverter and exchanges end A2, and another end points K12 of K switch 1 is connected with another end points K22 of K switch 2 by transformer to electrical network;
Master control system, for controlling the on off state that exchanges allotment switch, meanwhile, master control system is connected with the data port of both-end bidirectional energy-storage inverter with bidirectional energy-storage inverter by data wire;
Data acquisition unit, the input of this data acquisition unit connects respectively network load monitor and photovoltaic power generation equipment monitor, and the output of this data acquisition unit is connected to master control system;
Diesel engine generator, is connected with the public point of K2 in interchange allotment switch;
According to the signal of data acquisition unit, master control system energy control switch K1 conducting, lead-acid batteries through bidirectional energy-storage inverter and lithium battery group respectively through both-end bidirectional energy-storage inverter to transformer, the final inversion electrical network that generates electricity, also the electricity on electrical network oppositely can be charged to lead-acid batteries and lithium battery group, when the public point of K2 is connected to the end points K21 of K switch 2, diesel generation function exchanges end A2 through second of both-end bidirectional energy-storage inverter lithium battery group is charged, simultaneously also can be through the first interchange end A1, the interchange end B of bidirectional energy-storage inverter charges to lead-acid batteries.
2. the energy-storage module mixing preparation system of a kind of photovoltaic generation as claimed in claim 1, is characterized in that, the impulse electricity number of times of described lead-acid batteries is less than described lithium battery group impulse electricity number of times.
3. a control method for the energy-storage module mixing preparation system of photovoltaic generation, comprises and it is characterized in that the energy-storage module mixing preparation system of a kind of photovoltaic generation as claimed in claim 1 or 2, controls as follows:
A, according to the size of mains supply amount, divide stable power-supplying period, fluctuation power supply period;
B, stable power-supplying period are main power supply by lead-acid batteries, lithium battery group supplementary power; The fluctuation power supply period is main power supply by lithium battery group, and insufficient section is by lead-acid batteries supplementary power.
4. the control method of the energy-storage module mixing preparation system of a kind of photovoltaic generation as claimed in claim 3, is characterized in that, the electric discharge of described lead-acid batteries can intermittent discharge, and the electricity time of rushing of this lead-acid batteries presets.
5. the control method of the energy-storage module mixing preparation system of a kind of photovoltaic generation as claimed in claim 4, is characterized in that, described lead-acid batteries rush electricity the time once a day.
CN201410151740.5A 2014-04-15 2014-04-15 The energy-storage module mixing preparation system of photovoltaic generation and control method thereof Active CN103956821B (en)

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WO2015149206A1 (en) * 2014-03-31 2015-10-08 刘骏涛 Hand-cranked charger
CN111049180A (en) * 2019-12-17 2020-04-21 国电南京自动化股份有限公司 Island microgrid voltage frequency control method and system based on hybrid energy storage
CN111313397A (en) * 2020-03-24 2020-06-19 北京双登慧峰聚能科技有限公司 Energy control system and control method for communication base station hybrid power supply system

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CN111049180A (en) * 2019-12-17 2020-04-21 国电南京自动化股份有限公司 Island microgrid voltage frequency control method and system based on hybrid energy storage
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CN111313397B (en) * 2020-03-24 2022-03-22 北京双登慧峰聚能科技有限公司 Energy control system and control method for communication base station hybrid power supply system

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