CN204118818U - A kind of accumulator cell charging and discharging management system of angle of solar battery system - Google Patents
A kind of accumulator cell charging and discharging management system of angle of solar battery system Download PDFInfo
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- CN204118818U CN204118818U CN201420607325.1U CN201420607325U CN204118818U CN 204118818 U CN204118818 U CN 204118818U CN 201420607325 U CN201420607325 U CN 201420607325U CN 204118818 U CN204118818 U CN 204118818U
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to a kind of accumulator cell charging and discharging management system of angle of solar battery system, comprise photovoltaic power supply assembly, DC controller, inverter, DC controller is electrically connected with photovoltaic power supply assembly and inverter, DC controller just, negative output terminal is connected with DC bus respectively, multiple charge/discharge unit in parallel on DC bus, each charge/discharge unit comprises two-way DC/DC converter and storage battery, two-way DC/DC converter is connected with storage battery, detection control assembly by 485 connections respectively with DC controller, inverter is connected with the communication of two-way DC/DC converter, the peripheral circuit that detection control assembly comprises STM32F0 single-chip microcomputer and is connected with STM32F0 single-chip microcomputer, peripheral circuit comprises crystal oscillating circuit, reset circuit, interface circuit, external memory circuit, clock circuit and asynchronous communication circuit.This management system can realize charge efficiency and maximize, high without the need to software, high efficient and reliable, bulk life time, and can change flexibly, is easy to expansion; Simultaneously price low, easily apply.
Description
Technical field
The utility model belongs to solar energy power generating field, relates to the management system in a kind of solar energy power generating process, particularly relates to a kind of accumulator cell charging and discharging management system of independent photovoltaic generating system.
Background technology
In independent solar electricity generation system, in order to reduce costs, raise the efficiency and reliability, photovoltaic cell Maximum Power Output should be made, make the correct discharge and recharge of storage battery again, also will maximally utilise generated electricity energy simultaneously.In current photovoltaic system, there is contradiction in the realization of this three, usually an aspect is just thought of, the best discharge and recharge of storage battery is abandoned as only followed the trail of maximum power of photovoltaic cell point, and storage battery is as link the most flimsy in photovoltaic system, to efficiency and the life-span of whole photovoltaic system be had a strong impact on, and cause cost and maintenance cost greatly to increase.
At present, maintenance-free lead accumulator, as energy storage device, due to advantages such as maintenance are little, easy to use, is widely applied in photovoltaic system.Accumulator cell charging and discharging carries out according to chemical reaction, and namely the structure of battery primary clustering and chemical composition occur continuously and the change of the degree of depth.So compared with general electronic component, storage battery is more responsive to variations in temperature.In addition, reaction rate, i.e. charging current or discharging current, affect the performance that response parameter also affects storage battery thus.Simultaneously, the condition of work of the storage battery in photovoltaic system is different in the condition of work of other occasions from storage battery, and its charge rate and discharge rate are all very little, and the charging interval is restricted, namely only could charge when sunshine, so the charge rule can not fixed by charges to it.Because battery applications is under the environment that this is special, also therefore become the most flimsy part in whole photovoltaic system, daily Rational Maintenance measure is absolutely necessary.At present, research finds, when problem is storage battery for photovoltaic, the charging interval is restricted and charge-discharge magnification is little.Storage battery is in charge less state for a long time; Thus accelerate sulfation and acid solution layering.Meanwhile, the PbS04 crystalline particle formed under low discharging current is thick, and this dissolving crystallized difficulty, finally have impact on the life-span of storage battery.
At present, when designing photovoltaic system, photovoltaic cell and load and storage battery are fixed coupling, and meanwhile, there is dry running and charge less two problems above, its basic circuit structure as shown in Figure 1.The output of DC controller 2 is directly connected with inverter 3 with storage battery 7, does like this and can avoid overcharging, but cannot solve the charge less that may occur; storage battery lacks available protecting; can not get optimal charge, the life of storage battery will be caused if things go on like this to reduce, add system maintenance expense.In addition, when the output power from photovoltaic cells is larger, due to the general nonvoluntary change of inverter load; the excessive phenomenon of charge power just may be there is in certain hour section; need starting protection circuit to limit charge strength, will certainly energy waste be caused like this, indirectly add systems generate electricity cost.Equally, due to the uncertainty of load, just there will be all battery unit partial discharge phenomenons when storage battery is powered separately, namely storage battery can not discharge completely, is also harmful like this to storage battery.
In order to solve the problem, have recently emerged a kind of new charge in batteries management system.As shown in Figure 2, described accumulator cell charging and discharging management system comprises photovoltaic power supply assembly 1, DC controller 2 and inverter 3.Described DC controller 2 is electrically connected with described photovoltaic power supply assembly 1 and described inverter 3.The positive and negative output of described DC controller 2 is connected with DC bus 8 respectively.Multiple charge/discharge unit in parallel on described DC bus 8.Each described charge/discharge unit comprises two-way DC/DC converter 6 and storage battery 7.Described two-way DC/DC converter 7 is electrically connected with described storage battery 7.Main control computer 4 is connected with described DC controller 2, inverter 3 and the communication of two-way DC/DC converter 6 respectively by 485 connections 5.This accumulator cell charging and discharging management system to a certain degree solves the problems referred to above, but it also has following shortcoming: first, it needs the main control computer of make purchases worth more costliness, and cost compare is high, make it popularize application and be very limited; Secondly, adopt main control computer to control, need to use control software design, make it higher to the technical requirement of operating personnel, further limit it and apply; Finally, whole management system will rely on control software design, and therefore poor reliability, bulk life time are shorter.
Therefore, low in the urgent need to a kind of price, low thus easy to utilize to technical requirement at present, and the accumulator cell charging and discharging management system of the angle of solar battery system that reliability is high, bulk life time is long.
Summary of the invention
The purpose of this utility model is the defect in order to make up prior art, a kind of accumulator cell charging and discharging management system of new angle of solar battery system is provided, it can realize charge efficiency and maximize, and only rely on the hardware such as chip and do not need software, therefore high efficient and reliable, bulk life time are high, and can change flexibly, are easy to expansion; Simultaneously price low, be easy to apply.
For this reason, the utility model provides following technical scheme: a kind of accumulator cell charging and discharging management system of angle of solar battery system, comprise photovoltaic power supply assembly, DC controller, inverter, described DC controller is electrically connected with described photovoltaic power supply assembly and described inverter, described DC controller just, negative output terminal is connected with DC bus respectively, multiple charge/discharge unit in parallel on described DC bus, each described charge/discharge unit comprises two-way DC/DC converter and storage battery, described two-way DC/DC converter is connected with described storage battery, it is characterized in that, detection control assembly by 485 connections respectively with described DC controller, inverter is connected with the communication of two-way DC/DC converter, the peripheral circuit that described detection control assembly comprises STM32F0 single-chip microcomputer and is connected with described STM32F0 single-chip microcomputer, described peripheral circuit comprises crystal oscillating circuit, reset circuit, interface circuit, external memory circuit, clock circuit and asynchronous communication circuit.
Further, wherein, analog comparator, SPI serial ports, UART serial ports and 8 A/D converters in described STM32F0 single-chip microcomputer built-in programmable WatchDog Timer, sheet.
The accumulator cell charging and discharging management system of angle of solar battery system described in the utility model can realize charge efficiency on the one hand and maximize; On the other hand, it only relies on the hardware such as chip just can realize the management of accumulator cell charging and discharging, and does not need software, and therefore high efficient and reliable, bulk life time are high; Again on the one hand, it can change flexibly, be easy to expansion; Finally, price is low, technical requirement is simple, thus is easy to apply.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the accumulator cell charging and discharging management system of the angle of solar battery system of prior art.
Fig. 2 is the schematic diagram of the accumulator cell charging and discharging management system of the angle of solar battery system of another prior art.
Fig. 3 is the schematic diagram of the accumulator cell charging and discharging management system of angle of solar battery system of the present utility model.
Fig. 4 is the detailed connection diagram of STM32F0 single-chip microcomputer in the utility model and part peripheral circuit.
Fig. 5 is the schematic diagram of the asynchronous communication circuit in the utility model.
Fig. 6 is the schematic diagram of the interface circuit in the utility model.
Fig. 7 is the schematic diagram of the R8485 communication interface in the utility model.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing, the content of embodiment is not as the restriction to protection content of the present utility model.
The utility model relates to a kind of accumulator cell charging and discharging management system of angle of solar battery system, it can realize charge efficiency and maximize, and only rely on the hardware such as chip and do not need software, therefore high efficient and reliable, bulk life time are high, and can change flexibly, are easy to expansion; Simultaneously price low, be easy to apply.
Fig. 3 shows the schematic diagram of the accumulator cell charging and discharging management system of angle of solar battery system of the present utility model.As shown in Figure 3, the accumulator cell charging and discharging management system of described angle of solar battery system comprises photovoltaic power supply assembly 1, DC controller 2 and inverter 3.Described DC controller 2 is electrically connected with described photovoltaic power supply assembly 1 and described inverter 3.The positive and negative output of described DC controller 2 is connected with DC bus 8 respectively.Multiple charge/discharge unit in parallel on described DC bus 8.Each described charge/discharge unit comprises two-way DC/DC converter 6 and storage battery 7.Described two-way DC/DC converter 6 is electrically connected with described storage battery 7.Wherein, described photovoltaic power supply assembly 1 is for being converted to direct current by solar energy.Described DC controller 2 is the DC/DC converters containing MPPT algorithm.Described DC bus 8 is flowed into by the direct current after the direct current that described photovoltaic power supply assembly 1 transforms can be carried out MPPT algorithm by described DC controller 2.Described inverter 3 is for being alternating current by the DC conversion in described DC bus 8.Described 6, two-way DC/DC converter is for realizing the discharge and recharge action of storage battery 7.Described storage battery 7 is for realizing the electric energy storing the generation of described photovoltaic power supply assembly 1.
In the utility model, the accumulator cell charging and discharging management system of described angle of solar battery system comprises detection control assembly further.Described detection control assembly is connected with described DC controller 2, inverter 3 and the communication of two-way DC/DC converter 6 respectively by 485 connections 5.Monitor the power output of described photovoltaic power supply assembly 1 and the capacity condition of each group storage battery 7 by described detection control assembly, thus realize the charge or discharge state of storage battery 7 by controlling MPPT algorithm.
In the utility model, as shown in Figure 3, the described detection control assembly peripheral circuit that comprises STM32F0 single-chip microcomputer and be connected with described STM32F0 single-chip microcomputer.Described peripheral circuit comprises crystal oscillating circuit, reset circuit, interface circuit, external memory circuit, clock circuit and asynchronous communication circuit.Analog comparator, SPI serial ports, UART serial ports and 8 A/D converters in described STM32F0 single-chip microcomputer built-in programmable WatchDog Timer, sheet.Wherein, described crystal oscillating circuit provides the clock cycle for described STM32F0 single-chip microcomputer.Described reset circuit can make described STM32F0 Single Chip Microcomputer (SCM) system carry out reset operation at any time.Described interface circuit is the interface that the asynchronous communication circuit of described STM32F0 single-chip microcomputer is connected with described two-way DC/DC converter.Described external memory circuit is responsible for storage system service data.Described clock circuit can displaying time in real time.Described asynchronous communication circuit is responsible for the signal transmission between described STM32F0 single-chip microcomputer and described bidirectional DC-DC converter and the pwm signal that drives described bidirectional DC-DC converter to send according to described STM32F0 single-chip microcomputer adjusts.
Due to the restriction of map sheet size, Fig. 4 shows the detailed connection diagram of STM32F0 single-chip microcomputer in the utility model and part peripheral circuit (crystal oscillating circuit, reset circuit, external memory circuit and clock circuit), and the RS485 communication interface that wherein asynchronous communication circuit and interface circuit and single-chip microcomputer are connected with 485 connections illustrates separately.Fig. 5 shows the schematic diagram of the asynchronous communication circuit in the utility model.Fig. 6 shows the schematic diagram of the interface circuit in the utility model.Fig. 7 shows the schematic diagram of the RS485 communication interface in the utility model.Wherein, described asynchronous communication circuit is connected with described two-way DC/DC converter by described interface circuit.Described RS485 communication interface is for realizing the connection of described 485 connections 5 and described STM32F0 single-chip microcomputer.As shown in figs. 4-7, described STM32F0 single-chip microcomputer reads the information such as current battery condition, photovoltaic power output, bearing power the pwm signal of generation correspondence sent by RS485 bus.Wherein, the carrier cycle of PWM is completed by on-chip timer T0, definition of T/C1 control register TCCR1A and T/C2 control register TCCR2, makes T/C1 be operated in 8 PWM mode.Pwm control signal is exported again by PA, PB port, PA0-PA7, PB5-PB15 mouth is connected with the B0-B7 mouth of two pieces of 74HC245 chips respectively, thus pwm signal is sent to asynchronous communication chip 74HC245,74HC245 is tri-state 8 BITBUS network transceiver, can carry out the communication between 2 tunnel asynchronous data buses.Between the parallel interface of described STM32F0 single-chip microcomputer and the parallel interface of outside controlled plant, use 74HC245 to play cushion and driving effect.Arrange 74HC245 chip DIR=0, DE=0, definition B0-B7 is input port A0-A7 is output port.74HC245 chip A0-A7 output port is connected with interface circuit, and is connected to DC/DC converter by interface circuit, realizes controlling the charging of storage battery by the duty ratio of adjustment DC/DC converter equidirectional while of pwm signal and charger.
During charging, described STM32F0 single-chip microcomputer, by calculating photovoltaic module power and power output, regulates photovoltaic working point to follow the tracks of DC controller and two-way DC/DC converter intelligently, is dynamically determined to need charging accumulator number by it; During electric discharge, the maximum difference of photovoltaic power output and bearing power to be judged equally, determine with this storage battery number participating in electric discharge; Discharge and recharge all will maintain the best charge and discharge mode of storage battery.Particularly, before discharge and recharge, the storage battery of fullcharging electricity and the discharge and recharge that has been unlocked removes by detection control assembly from carrying capacity sequence.Then how many all the other batteries to be arranged according to each storage battery is charged, carrying capacity is discontented with and exposed maximum storage battery as the battery of first charging, then determine the order that charges successively.Detection control assembly first charges from first storage battery, namely first first storage battery is carried out cooperation control together with two-way DC/DC converter.Control procedure realizes in two kinds of situation: first, storage battery is under constant current or constant voltage charging method, when storage battery can accept this maximum power, former mode is kept to the charging modes of storage battery, at this moment can adopt conventional control method to the charging of storage battery: first constant current, again constant voltage 2 stage control mode; The second, storage battery, under constant current or constant voltage charging method, when storage battery can not accept the maximum power of array output, adopts efficient charging technique to improve the charge acceptance of storage battery, makes storage battery obtain quick charge, improve the charge level of storage battery.Then open second two-way DC/DC converter according to above-mentioned said method, added to by control queue, the like.Each two-way DC/DC converter of detection control component coordination, under making it be in fast charge mode all as far as possible, and is full of the storage battery first charged as far as possible.Similar to charging during electric discharge, calculate in real time the difference of input-output power, and calculate the storage battery number that need discharge with this, during calculating with the optimal discharge electric current of single storage battery for condition.Discharge order is identical with charging, first discharges from the storage battery that carrying capacity is maximum, in case the little individual battery of carrying capacity can not get filling in time after discharging completely again.When the difference of input-output power reduces, disconnect charge/discharge unit in reverse order.After all accumulator voltages arrive the final discharging voltage arranged, stop electric discharge at once, avoid overdischarge occurs.
In the utility model, detection control assembly is made up of STM32F0 single-chip microcomputer and various circuit, and various circuit then has corresponding cheap chip to make, therefore the less expensive of whole inspection control assembly, thus contributes to it and apply.In addition, each circuit is made up of corresponding chip, and without the need to control software design, therefore, its Reliability comparotive is high, thus makes the useful life of whole management system long.Again, because whole detection control assembly is all made up of single-chip microcomputer and chip, and do not need computer software etc., thus make it lower to the requirement of technical staff, do not need technical staff to understand the correlation techniques such as programming, therefore, be more conducive to it and apply.
The content of embodiment is understood for the ease of those skilled in the art and uses the utility model and describe, and does not form the restriction to the utility model protection content.Those skilled in the art, after having read content of the present utility model, can carry out suitable amendment to the utility model.Protection content of the present utility model is as the criterion with the content of claim.When not departing from flesh and blood and the protection range of claim, the various amendments carried out the utility model, change and replacement etc. are all within protection range of the present utility model.
Claims (2)
1. the accumulator cell charging and discharging management system of an angle of solar battery system, comprise photovoltaic power supply assembly (1), DC controller (2), inverter (3), described DC controller (2) is electrically connected with described photovoltaic power supply assembly (1) and described inverter (3), described DC controller (2) just, negative output terminal is connected with DC bus (8) respectively, the upper multiple charge/discharge unit in parallel of described DC bus (8), each described charge/discharge unit comprises two-way DC/DC converter (6) and storage battery (7), described two-way DC/DC converter (6) is electrically connected with described storage battery (7), it is characterized in that, detection control assembly by 485 connections (5) respectively with described DC controller (2), inverter (3) is connected with the communication of two-way DC/DC converter (6), the peripheral circuit that described detection control assembly comprises STM32F0 single-chip microcomputer and is connected with described STM32F0 single-chip microcomputer, described peripheral circuit comprises crystal oscillating circuit, reset circuit, interface circuit, external memory circuit, clock circuit and asynchronous communication circuit.
2. the accumulator cell charging and discharging management system of angle of solar battery system as claimed in claim 1, wherein, analog comparator, SPI serial ports, UART serial ports and 8 A/D converters in described STM32F0 single-chip microcomputer built-in programmable WatchDog Timer, sheet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980091A (en) * | 2015-06-23 | 2015-10-14 | 四川蜀旺科技有限公司 | Luminous energy storage inversion system |
| CN105161773A (en) * | 2015-09-11 | 2015-12-16 | 大英德创精工设备有限公司 | Positive and negative pulse lead-acid cell formation device |
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2014
- 2014-10-21 CN CN201420607325.1U patent/CN204118818U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104980091A (en) * | 2015-06-23 | 2015-10-14 | 四川蜀旺科技有限公司 | Luminous energy storage inversion system |
| CN105161773A (en) * | 2015-09-11 | 2015-12-16 | 大英德创精工设备有限公司 | Positive and negative pulse lead-acid cell formation device |
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