CN106877484A - A kind of stand-alone PV power station accumulator cell management method - Google Patents
A kind of stand-alone PV power station accumulator cell management method Download PDFInfo
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- CN106877484A CN106877484A CN201510914995.7A CN201510914995A CN106877484A CN 106877484 A CN106877484 A CN 106877484A CN 201510914995 A CN201510914995 A CN 201510914995A CN 106877484 A CN106877484 A CN 106877484A
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- battery
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- alone
- power station
- management method
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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
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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
Abstract
The invention discloses a kind of stand-alone PV power station accumulator cell management method, including segmented is charged, float charge voltage is compensated, four parts of under-voltage protection and controller.The optimum management of battery, effectively extends its working life, and controller fully achieves the optimum management of stand-alone PV power station battery, and system cost is low, strong antijamming capability, working service are convenient, is conducive to improving the automatization level of photovoltaic plant.System has achieved good effect, the need for being entirely capable of meeting photovoltaic plant no worker monitor since put into operation.
Description
Technical field
The present invention relates to a kind of accumulator cell management method, more particularly to a kind of stand-alone PV power station accumulator cell management method.
Background technology
Solar energy has random and interruption characteristic, and independent type photovoltaic power generation system will realize the supply of electric power of continuous-stable, need to use necessary energy storage equipment.Battery is a kind of traditional energy conversion efficiency energy storage mode higher, and compared with photovoltaic cell, the initial outlay advantage of lower cost of battery, service life is shorter.For the angle used from battery, influenceing the factor of service lifetime of accumulator mainly has：Overcharge, cross and put, charge less is chronically at low state-of-charge (State of Charge, SOC) etc..
Frequently, compared with frequently as stand-by power supply in the situation that the field that is normally applied (such as post and telecommunications and typical power system) is applied, it is using being provided with some new features for accumulator cell charging and discharging number of times in photovoltaic system：(1) due to the randomness of the finiteness of photovoltaic electric energy, randomness and discontinuity and loading demand in photovoltaic generating system, photovoltaic electric energy is difficult to persistently meet the requirement of traditional storage battery charge rule (constant-current charge, constant-voltage charge, two benches charge, three stages charged etc.)；(2) seasonal variety of illumination and continuous cloudy day easily cause battery deep discharge and cross put after be also difficult to be again filled with a short time so that it is chronically at low SOC states.Therefore, in photovoltaic system, inappropriate battery management strategy will greatly shorten the life expectancy of battery, as most flimsy part in photovoltaic system.
The content of the invention
For the problem for overcoming photovoltaic power station system failure and failure cause often to be caused by battery, the present invention proposes a kind of stand-alone PV power station accumulator cell management method.
The technical solution adopted for the present invention to solve the technical problems is：In order to realize the optimum management of battery in stand-alone PV power station system, effectively extend its working life, it is proposed that the segmented battery charging strategy based on mixed-fuzzy PID control algolithm.The charging of battery is divided into constant-current charge, constant pressure and fills by the strategy can carry out real-Time Compensation with 3 stages of constant voltage floating charge, float charge voltage according to battery temperature.
Stand-alone PV power station accumulator cell management method includes：Segmented is charged, float charge voltage is compensated, four parts of under-voltage protection and controller.
The segmented charge can be divided into constant-current charge, constant pressure fill with 3 stages of constant voltage floating charge, be conducive to extending the working life of battery, improving the reliability of charge efficiency and photovoltaic power station system.
The float charge voltage compensation carries out real-Time Compensation according to battery temperature to the float charge voltage of battery, avoids high temperature overcharge and low temperature charge less electricity.
The under-voltage protection when battery discharge to final voltage controller can cut-out electric loading in time, audible and visual alarm is simultaneously emitted by, to prevent battery deep discharge.
The controller is control with C8051F021 single-chip microcomputers and detects core, by the use of IGBT as copped wave device, so as to realize the optimum management of battery and the operational monitoring of photovoltaic plant.
The beneficial effects of the invention are as follows：The optimum management of battery, effectively extends its working life, and controller fully achieves the optimum management of stand-alone PV power station battery, and system cost is low, strong antijamming capability, working service are convenient, is conducive to improving the automatization level of photovoltaic plant.System has achieved good effect, the need for being entirely capable of meeting photovoltaic plant no worker monitor since put into operation.
Brief description of the drawings
Fig. 1 mixed-fuzzy PIDs are controlled.
Fig. 2 system main circuits.
Specific embodiment
System can control carry out constant current, constant pressure fill, the conversion of floating charge state, so as to realize the optimum management of battery.A constant-current phases：Battery is charged using the constant current of 0.1C first, the rated capacity of battery when wherein C is 10 h discharge rates constantly carries out battery tension and can gradually rise with what is charged.B constant pressures fill the stage：When charging voltage reaches even charging voltage, switch to constant pressure and charge, at this moment the charging current of battery can be gradually reduced.The C floating charge stages:When charging current is less than 0.01C, start timing (2~3 h can set), be timed to, then turn floating charge, float charge voltage carries out real-Time Compensation according to battery temperature.Timing function is combined with electric current criterion, control is equal, the conversion of floating charge, can avoid overcharging or charge less for battery.
The change of temperature and float charge voltage can bring serious harm to lead-acid accumulator.Controller must carry out real-Time Compensation according to battery temperature to the float charge voltage of battery, it is to avoid high temperature overcharge and low temperature charge less electricity, make battery that full appearance state can be kept under various temperature environments.Controller employs linear compensation way, first carries out real-time monitoring to battery temp, battery float charge voltage is then correspondingly adjusted, so as to reach the purpose of float charge voltage temperature-compensating.
Constant-current charge be in deviation ratio, integration and differential linearity combination be controlled, it is on the basis of mathematical model of controlled plant is obtained, according to a certain setting principle, 3 parameters of Kp, Ki, Kd for the PID that suitably adjusts can obtain satisfied control effect.
In Fig. 1, r is system set-point, and y is real output value, and e is the deviation between r and y, and K1, K2 are proportionality coefficient, are the output of fuzzy controller, are the output of PID controllers, are total output of mixed-fuzzy PID controller.When the deviation of system is larger, integral coefficient and proportionality coefficient are larger;When the deviation of system is smaller, integral coefficient and proportionality coefficient are also smaller.This control mode can both ensure the dynamic responding speed of system, and certain stable state accuracy can be met again.
In Fig. 2, respectively voltage set-point and real output value, respectively given value of current value and real output value.When constant current or constant-voltage charge, the charging current or charging voltage of battery are carried out into closed-loop control as feedback signal respectively.Default value compared with actual value error e, after blended type fuzzy controller regulation, by changing the dutycycle that single-chip microcomputer C8051F021 exports PWM control signals in real time, again through the turn-on and turn-off of light-coupled isolation drive control IGBT power devices, carry out DC/DC chopping depressurings, change the size of system output voltage, it is achieved thereby that constant current or constant-voltage charge function.
Claims (5)
1. a kind of stand-alone PV power station accumulator cell management method, it is characterised in that：Charged including segmented, float charge voltage is compensated, four parts of under-voltage protection and controller.
2. stand-alone PV power station accumulator cell management method as claimed in claim 1, it is characterised in that the segmented charges and can be divided into constant-current charge, constant pressure and fill and 3 stages of constant voltage floating charge.
3. stand-alone PV power station accumulator cell management method as claimed in claim 1, it is characterised in that the float charge voltage compensation carries out real-Time Compensation according to battery temperature to the float charge voltage of battery, it is to avoid high temperature overcharge and low temperature charge less electricity.
4. stand-alone PV power station accumulator cell management method as claimed in claim 1, it is characterised in that the under-voltage protection when battery discharge to final voltage controller can cut-out electric loading in time, to prevent battery deep discharge.
5. stand-alone PV power station accumulator cell management method as claimed in claim 1, it is characterized in that the controller is control with C8051F021 single-chip microcomputers and detects core, by the use of IGBT as copped wave device, so as to realize the optimum management of battery and the operational monitoring of photovoltaic plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510914995.7A CN106877484A (en) | 2015-12-14 | 2015-12-14 | A kind of stand-alone PV power station accumulator cell management method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510914995.7A CN106877484A (en) | 2015-12-14 | 2015-12-14 | A kind of stand-alone PV power station accumulator cell management method |
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| Publication Number | Publication Date |
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| CN106877484A true CN106877484A (en) | 2017-06-20 |
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| CN201510914995.7A Pending CN106877484A (en) | 2015-12-14 | 2015-12-14 | A kind of stand-alone PV power station accumulator cell management method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245134A (en) * | 2018-11-14 | 2019-01-18 | 上海交通大学 | Adaptively regulate and control the hybrid energy-storing dispatching method and system of algorithm based on Virtual Fuzzy |
| CN113300428A (en) * | 2021-05-17 | 2021-08-24 | 上海擎朗智能科技有限公司 | Charging circuit, charging device, charging method, charging system, and robot |
-
2015
- 2015-12-14 CN CN201510914995.7A patent/CN106877484A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245134A (en) * | 2018-11-14 | 2019-01-18 | 上海交通大学 | Adaptively regulate and control the hybrid energy-storing dispatching method and system of algorithm based on Virtual Fuzzy |
| CN109245134B (en) * | 2018-11-14 | 2021-06-18 | 上海交通大学 | Hybrid energy storage scheduling method and system based on virtual fuzzy adaptive control algorithm |
| CN113300428A (en) * | 2021-05-17 | 2021-08-24 | 上海擎朗智能科技有限公司 | Charging circuit, charging device, charging method, charging system, and robot |
| CN113300428B (en) * | 2021-05-17 | 2023-07-28 | 上海擎朗智能科技有限公司 | Charging circuit, charging device, charging method, charging system, and robot |
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Application publication date: 20170620 |