CN104868840A - Photovoltaic energy storage inverter off-grid MPPT perturbation method - Google Patents
Photovoltaic energy storage inverter off-grid MPPT perturbation method Download PDFInfo
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- CN104868840A CN104868840A CN201510237272.8A CN201510237272A CN104868840A CN 104868840 A CN104868840 A CN 104868840A CN 201510237272 A CN201510237272 A CN 201510237272A CN 104868840 A CN104868840 A CN 104868840A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 1
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- H02J3/385—
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a photovoltaic energy storage inverter off-grid MPPT perturbation method. The method comprises the steps that: an independent power loop connected with a photovoltaic panel to form a photovoltaic loop is set, and an independent charge and discharge loop connected with a battery to form a charge loop and a discharge loop is set; the voltage of a bus is detected; when the voltage of the bus is larger than the upper limit of a control reference voltage of an off-grid system, a photovoltaic energy storage inverter stops the MPPT control over the photovoltaic panel, the voltage of the bus is stabilized to the control reference voltage of the off-grid system, and the discharge loop of the battery is switched off; when the voltage of the bus is lower than the lower limit of the control reference voltage of the off-grid system, the photovoltaic energy storage inverter starts the MPPT control over the photovoltaic panel, the PV voltage of the photovoltaic panel is controlled to a photovoltaic maximum power point, and the battery is controlled by the discharge loop to carry out discharging; or else, the off-grid system maintains the current work state. By applying the method, the photovoltaic off-grid application power configuration restriction and the photovoltaic utilization rate are greatly improved, and the photovoltaic application stability in a district without a power grid is realized.
Description
Technical field
The present invention relates to photovoltaic energy storage field, be specifically related to a kind of MPPT perturbation motion method be applied in off-grid system.
Background technology
The application of current photovoltaic energy storage in off-grid system, major way is that photovoltaic panel is as charge independence source, there is during charging MPPT function, its shortcoming is: photovoltaic does not have independent power loop and directly inversion cannot export Power supply load, battery is full of rear MPPT and lost efficacy, make system configuration power limited, photovoltaic utilance is not high, and in battery discharge procedure, photovoltaic provides charge power to affect battery useful life.
Summary of the invention
The object of this invention is to provide a kind of photovoltaic off-grid applied power that promotes and configure the photovoltaic energy storage inverter of restriction and photovoltaic utilance from net MPPT perturbation motion method
For achieving the above object, the technical solution used in the present invention is:
A kind of photovoltaic energy storage inverter is from net MPPT perturbation motion method, be applied in photovoltaic energy storage off-grid system, described off-grid system comprises described photovoltaic energy storage inverter and coupled photovoltaic panel and battery, and described photovoltaic energy storage inverter is connected with bus, and described method comprises:
(1) arrange be connected to form photovoltaic loop with described photovoltaic panel independent power loop, be connected to form the independent charging and discharging circuit of charge circuit and discharge loop with described battery, described independent power loop and described independent charging and discharging circuit are connected in parallel to described bus;
(2) detect described in the voltage of bus, and accordingly whether MPPT is carried out to photovoltaic loop and closes and detect:
When on the control reference voltage that the voltage of described bus is greater than described off-grid system in limited time, described photovoltaic energy storage inverter cuts out and controls the MPPT of described photovoltaic panel, described photovoltaic loop is converted to voltage source output mode, to described independent power loop output power, described photovoltaic energy storage inverter by the voltage stabilization of described bus to the control reference voltage of described off-grid system, described photovoltaic energy storage inverter close described in the discharge loop of battery;
Prescribe a time limit under the voltage of described bus is less than the control reference voltage of described off-grid system, described photovoltaic energy storage inverter is opened and is controlled the MPPT of described photovoltaic panel, described photovoltaic loop is converted to current source output mode, described photovoltaic energy storage inverter is by the PV voltage control of described photovoltaic panel in maximum photovoltaic power point, and the described battery described in photovoltaic energy storage inverter control is by the electric discharge of described discharge loop;
Otherwise described off-grid system keeps current operating state.
Described step (2) is carried out in real time by MPPT function detection module.
In above scheme, the control reference voltage upper limit of described off-grid system is that photovoltaic off-grid reference voltage and MPPT close the hysteresis voltage sum detected, and the control reference voltage lower limit of described off-grid system is the difference that photovoltaic off-grid reference voltage and MPPT close the hysteresis voltage detected.
By photovoltaic boosting loop and PI algorithm by the voltage stabilization of described bus to the control reference voltage of described off-grid system or by the PV voltage control of described photovoltaic panel in maximum photovoltaic power point.
When described battery is by described discharge loop electric discharge, the reference voltage in described battery discharge loop is the difference of the error voltage that the tracking electrical voltage point that controls of MPPT and MPPT control.
Because technique scheme is used, the present invention compared with prior art has following advantages: application this method can limit and photovoltaic utilance in the configuration of significant increase photovoltaic off-grid applied power, solves the stability problem without electrical network area photovoltaic application.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic flow sheet of photovoltaic energy storage inverter of the present invention from net MPPT perturbation motion method.
Embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: shown in accompanying drawing 1.Off-grid system comprises photovoltaic energy storage inverter and coupled photovoltaic panel and battery, and photovoltaic energy storage inverter is connected with bus.Be applied to photovoltaic energy storage inverter in above-mentioned photovoltaic energy storage off-grid system from a net MPPT perturbation motion method, comprise:
(1) arrange the independent power loop being connected to form photovoltaic loop with photovoltaic panel, the independent charging and discharging circuit being connected to form charge circuit and discharge loop with battery, independent power loop and independent charging and discharging circuit are connected in parallel to bus.
(2) carry out following detection in real time by MPPT function detection module and control: detecting the voltage of bus, and accordingly whether MPPT being carried out to photovoltaic loop and close and detect:
As the voltage V of bus
bus(the control reference voltage upper limit of off-grid system is photovoltaic off-grid reference voltage V to be greater than the control reference voltage upper limit of off-grid system
pv_Refthe hysteresis voltage Δ V detected is closed with MPPT
mpptOffsum) time, photovoltaic energy storage inverter cuts out and controls the MPPT of photovoltaic panel, photovoltaic loop is converted to voltage source output mode, to independent power loop output power, photovoltaic energy storage inverter by photovoltaic boosting loop and PI algorithm by the voltage stabilization of bus to the control reference voltage V of off-grid system
pv_Ref, photovoltaic energy storage inverter cuts out the discharge loop of battery;
As the voltage V of bus
bus(the control reference voltage lower limit of off-grid system is photovoltaic off-grid reference voltage V to be less than the control reference voltage lower limit of off-grid system
pv_Refthe hysteresis voltage Δ V detected is closed with MPPT
mpptOffdifference) time, photovoltaic energy storage inverter is opened and is controlled the MPPT of photovoltaic panel, and photovoltaic loop is converted to current source output mode, and photovoltaic energy storage inverter boosts loop and PI algorithm by the PV voltage control of photovoltaic panel at maximum photovoltaic power point V by photovoltaic
mPPT_Ref, photovoltaic energy storage inverter control battery is discharged by discharge loop; When battery is discharged by discharge loop, the reference voltage V in battery discharge loop
bat_Reffor the tracking electrical voltage point V that MPPT controls
mPPT_Refthe error voltage Δ V controlled with MPPT
mpptErrordifference.The error voltage Δ V that MPPT controls
mpptErrorscope is not limit, if do not consider that battery low discharging current affects, this value can be set to 0, and now MPPT efficiency can reach 99%.Battery discharge power output P
batVA=P
load-P
mPPT.Wherein, P
loadfor bearing power, P
mPPTfor current photovoltaic power output.
Otherwise off-grid system keeps current operating state.
Above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (5)
1. a photovoltaic energy storage inverter is from net MPPT perturbation motion method, be applied in photovoltaic energy storage off-grid system, described off-grid system comprises photovoltaic energy storage inverter and coupled photovoltaic panel and battery, described photovoltaic energy storage inverter is connected with bus, it is characterized in that: described method comprises:
(1) arrange be connected to form photovoltaic loop with described photovoltaic panel independent power loop, be connected to form the independent charging and discharging circuit of charge circuit and discharge loop with described battery, described independent power loop and described independent charging and discharging circuit are connected in parallel to described bus;
(2) detect described in the voltage of bus, and accordingly whether MPPT is carried out to photovoltaic loop and closes and detect:
When on the control reference voltage that the voltage of described bus is greater than described off-grid system in limited time, described photovoltaic energy storage inverter cuts out and controls the MPPT of described photovoltaic panel, described photovoltaic loop is converted to voltage source output mode, to described independent power loop output power, described photovoltaic energy storage inverter by the voltage stabilization of described bus to the control reference voltage of described off-grid system, described photovoltaic energy storage inverter close described in the discharge loop of battery;
Prescribe a time limit under the voltage of described bus is less than the control reference voltage of described off-grid system, described photovoltaic energy storage inverter is opened and is controlled the MPPT of described photovoltaic panel, described photovoltaic loop is converted to current source output mode, described photovoltaic energy storage inverter is by the PV voltage control of described photovoltaic panel in maximum photovoltaic power point, and the described battery described in photovoltaic energy storage inverter control is by the electric discharge of described discharge loop;
Otherwise described off-grid system keeps current operating state.
2. photovoltaic energy storage inverter according to claim 1 is from net MPPT perturbation motion method, it is characterized in that: described step (2) is carried out in real time by MPPT function detection module.
3. photovoltaic energy storage inverter according to claim 1 is from net MPPT perturbation motion method, it is characterized in that: the control reference voltage upper limit of described off-grid system is that photovoltaic off-grid reference voltage and MPPT close the hysteresis voltage sum detected, and the control reference voltage lower limit of described off-grid system is the difference that photovoltaic off-grid reference voltage and MPPT close the hysteresis voltage detected.
4. photovoltaic energy storage inverter according to claim 1 is from net MPPT perturbation motion method, it is characterized in that: by photovoltaic boosting loop and PI algorithm by the voltage stabilization of described bus to the control reference voltage of described off-grid system or by the PV voltage control of described photovoltaic panel in maximum photovoltaic power point.
5. photovoltaic energy storage inverter according to claim 1 is from net MPPT perturbation motion method, it is characterized in that: when described battery is by described discharge loop electric discharge, the reference voltage in described battery discharge loop is the difference of the error voltage that the tracking electrical voltage point that controls of MPPT and MPPT control.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106451547A (en) * | 2016-10-28 | 2017-02-22 | 阳光电源股份有限公司 | Maximum power point tracking method, controller and photovoltaic energy storage system |
| CN108063455A (en) * | 2017-12-11 | 2018-05-22 | 江苏辉伦太阳能科技有限公司 | One kind is from grid-connected photovoltaic energy storage inverter Poewr control method |
| CN110535367A (en) * | 2019-08-26 | 2019-12-03 | 南京理工大学 | A kind of control method of the single-phase off-network inverter of energy-saving type cascade photovoltaic |
| CN110957781A (en) * | 2019-12-02 | 2020-04-03 | 浙江大学 | Non-communication floating charge control method for two-stage series photovoltaic power optimizer system |
| CN111293720A (en) * | 2020-03-12 | 2020-06-16 | 江苏固德威电源科技股份有限公司 | Parallel photovoltaic energy storage system and parallel operation control method adopted by same |
| CN111949065A (en) * | 2020-08-25 | 2020-11-17 | 深圳市英威腾电气股份有限公司 | Photovoltaic water pump system and power regulation and control method, device, equipment and medium thereof |
| CN111959287A (en) * | 2020-08-28 | 2020-11-20 | 中国科学院工程热物理研究所 | Solar unmanned aerial vehicle and control method thereof, electronic device and medium |
| CN112531771A (en) * | 2020-11-25 | 2021-03-19 | 江苏为恒智能科技有限公司 | Off-grid MPPT control device and method for hybrid energy storage inverter |
| CN115951753A (en) * | 2022-12-23 | 2023-04-11 | 惠州汇能精电科技有限公司 | MPPT method, device, equipment and medium for photovoltaic module |
| CN117526427A (en) * | 2024-01-04 | 2024-02-06 | 万帮数字能源股份有限公司 | Control method and control device of photovoltaic system |
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| CN106451547B (en) * | 2016-10-28 | 2019-05-31 | 阳光电源股份有限公司 | A kind of maximum power point tracking method, controller and photovoltaic energy storage system |
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| CN108063455B (en) * | 2017-12-11 | 2021-05-18 | 江苏辉伦太阳能科技有限公司 | Off-grid and grid-connected photovoltaic energy storage inverter power control method |
| CN108063455A (en) * | 2017-12-11 | 2018-05-22 | 江苏辉伦太阳能科技有限公司 | One kind is from grid-connected photovoltaic energy storage inverter Poewr control method |
| CN110535367A (en) * | 2019-08-26 | 2019-12-03 | 南京理工大学 | A kind of control method of the single-phase off-network inverter of energy-saving type cascade photovoltaic |
| CN110957781A (en) * | 2019-12-02 | 2020-04-03 | 浙江大学 | Non-communication floating charge control method for two-stage series photovoltaic power optimizer system |
| CN110957781B (en) * | 2019-12-02 | 2021-02-09 | 浙江大学 | Non-communication floating charge control method for two-stage series photovoltaic power optimizer system |
| CN111293720A (en) * | 2020-03-12 | 2020-06-16 | 江苏固德威电源科技股份有限公司 | Parallel photovoltaic energy storage system and parallel operation control method adopted by same |
| CN111293720B (en) * | 2020-03-12 | 2022-06-28 | 固德威技术股份有限公司 | Parallel photovoltaic energy storage system and parallel operation control method adopted by same |
| CN111949065A (en) * | 2020-08-25 | 2020-11-17 | 深圳市英威腾电气股份有限公司 | Photovoltaic water pump system and power regulation and control method, device, equipment and medium thereof |
| CN111959287A (en) * | 2020-08-28 | 2020-11-20 | 中国科学院工程热物理研究所 | Solar unmanned aerial vehicle and control method thereof, electronic device and medium |
| CN112531771A (en) * | 2020-11-25 | 2021-03-19 | 江苏为恒智能科技有限公司 | Off-grid MPPT control device and method for hybrid energy storage inverter |
| CN112531771B (en) * | 2020-11-25 | 2023-07-21 | 江苏为恒智能科技有限公司 | Off-grid MPPT control device and method for hybrid energy storage inverter |
| CN115951753A (en) * | 2022-12-23 | 2023-04-11 | 惠州汇能精电科技有限公司 | MPPT method, device, equipment and medium for photovoltaic module |
| CN117526427A (en) * | 2024-01-04 | 2024-02-06 | 万帮数字能源股份有限公司 | Control method and control device of photovoltaic system |
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