CN106410933A - Photovoltaic off-grid inverter control method and control device - Google Patents
Photovoltaic off-grid inverter control method and control device Download PDFInfo
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- CN106410933A CN106410933A CN201510451369.9A CN201510451369A CN106410933A CN 106410933 A CN106410933 A CN 106410933A CN 201510451369 A CN201510451369 A CN 201510451369A CN 106410933 A CN106410933 A CN 106410933A
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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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Abstract
The invention discloses a photovoltaic off-grid inverter control method, and relates to the technical field of a photovoltaic off-grid inverter. The method is realized in such a way that by establishing a functional module architecture, a computer system is controlled by computer program instructions, and the computer program instructions are stored in a computer readable storage medium. A photovoltaic off-grid inverter comprises a mains supply rectifier module, a photovoltaic output control module, a battery and a busbar. An input end of the mains supply rectifier module is connected with a mains supply, and an output end is connected with the busbar. An input end of the photovoltaic output control module is connected with a solar panel, and an output end is connected with the busbar. The battery is charged from the busbar or discharged to the busbar. The control method is that if the solar energy is sufficient, the conduction angle of a switching element of a rectifier of the mains supply rectifier module is limited so as to be not less than a preset conduction angle limit value <theta>min. Thus, the case in which the rectifier is turned off due to that the conduction angle of the switching element is too small can be prevented, so that the mains supply rectifier module is ensured not to be turned off when the solar energy is sufficient.
Description
Technical field
The invention is related to photovoltaic off-grid inverter technical field and in particular to a kind of control method of photovoltaic off-grid inverter,
The method, by setting up functional module construction, to be completed by computer program instructions control computer system, these computer journeys
Sequence instruction storage is in a computer-readable storage medium.
Background technology
Fig. 1 show traditional photovoltaic off-grid inverter, and when solar energy is sufficient, the electric energy that solar panels PV produces is through photovoltaic
It is input to bus a after the conversion of output control module (such as MPPT module), if battery BAT underfill is electric, from
Bus a power taking is charged, and inversion module from bus a power taking and carries out inversion, then exports to load with powering load.
If solar energy is inadequate, from battery BAT to bussed supply, to maintain the power supply supply to load.If solar energy is not
Sufficient and battery BAT also cannot power, then switch K1 closure, is powered to the load by bypass bypass, now once bypassing
Abnormal, necessarily cause to load power down.
For this reason, as shown in Fig. 2 increasing mains-supplied in bus bar side, civil power AC supplies to bus a after the module of commercial power rectification
Electricity, thus allow bus a have civil power, solar energy and tri- power supply sources of battery BAT.So, in order to allow solar energy preferentially to
Bus a powers, and the operating voltage point setting photovoltaic output control module is higher than the operating voltage point of commercial power rectification module, certain mould
The operating voltage point of block refers to the desired value of the voltage of control bus a during the work of this module.So, in the situation that solar energy is sufficient
Under, the voltage of bus a is controlled near the operating voltage point of photovoltaic output control module, if commercial power rectification module is now
Normal work, because feedback quantity (actual value of the voltage of bus a) is more than aim parameter (the operating voltage point of commercial power rectification module),
The angle of flow causing the switch element (such as controllable silicon SCR) of the rectifier of commercial power rectification module constantly reduces, if described
The angle of flow is too small will to lead to rectifier block, and commercial power rectification module is also closed with regard to this.After commercial power rectification module is closed, if
Solar energy becomes unstable (i.e. sufficient during solar energy, when and inadequate), once and battery electric quantity is not enough, will result in
Inversion output (being powered to the load by inversion module output) and bypass output (being powered to the load by bypass bypass output)
Between frequent switching, this does not allow.On the other hand, if now bypass bypass is abnormal, due to commercial power rectification module
From starting to output energy demand experience a period of time, during this period of time may result in load power down.
Content of the invention
The above-mentioned technical problem existing for prior art, the invention provides a kind of control method of photovoltaic off-grid inverter,
It can ensure that commercial power rectification module is not turn off in the case of solar energy abundance.
For achieving the above object, the invention provides technical scheme below.
Photovoltaic off-grid inverter control method, described photovoltaic off-grid inverter includes commercial power rectification module, photovoltaic output control mould
Block, battery and bus, commercial power rectification module input connects civil power, and output end connects bus, and photovoltaic output control module is defeated
Enter end and connect solar panels, output end connects bus, battery is charged from bus power taking or is discharged to bus, including following
Step：
If solar energy is sufficient, limit the angle of flow of the switch element of rectifier of commercial power rectification module so as to be not less than default
Angle of flow limit value θmin.
Wherein, default angle of flow limit valueWherein UbusFor busbar voltage, ULLFor
The virtual value of city's line voltage.
Wherein, detect busbar voltage, if busbar voltage is in default voltage range, show that solar energy is sufficient.
Further, for control described switch element the angle of flow controlled quentity controlled variable be regulated quantity and default load compensation amount it
With described regulated quantity is the output of the algorithm of the angle of flow for controlling described switch element.
The beneficial effect of the invention is：Solar energy abundance in the case of, that is, from solar energy to bussed supply when
Wait, now limit the angle of flow of the switch element of rectifier of commercial power rectification module so as to be not less than default angle of flow limit value
θmin, the angle of flow that so can prevent described switch element is too small and leads to the situation of described rectifier block to occur, thus protecting
Card commercial power rectification module is not turn off in the case of solar energy abundance, when needing commercial power rectification module output electric energy,
Commercial power rectification module can quickly respond, it is to avoid load power down.In commercial power rectification module, photovoltaic output control module and electricity
In the case of not needing to communicate between the module of three, pond, work that also can be orderly.
Brief description
Fig. 1 is the structured flowchart of photovoltaic off-grid inverter；
Fig. 2 is the structured flowchart of another kind of photovoltaic off-grid inverter.
Specific embodiment
Below in conjunction with specific embodiment, the invention is elaborated.
The present embodiment illustrates with reference to the photovoltaic off-grid inverter shown in Fig. 2, and civil power described in the present embodiment is three-phase mains.
In the present embodiment, in order to allow solar energy preferentially to power, set the operating voltage point of photovoltaic output control module as 430V,
The operating voltage point of commercial power rectification module is 405V.The control method of the photovoltaic off-grid inverter of the present embodiment, mainly includes two
Big step：
First, whether detection solar energy is sufficient.Specifically, detect the voltage of bus a, under different degrees of solar energy,
The voltage that photovoltaic output control module provides to bus a is different, thus solar energy can be judged by the voltage of bus a
Whether sufficient.Pre-set a voltage range, for example, be not less than 420V, if the voltage of bus a is detected above-mentioned pre-
If voltage range in, such as 425V, then show that now solar energy is sufficient, if voltage bus a is detected does not exist
In above-mentioned default voltage range, such as 410V, then show that now solar energy is insufficient.
Second, if solar energy is sufficient, just limit the angle of flow of the switch element of rectifier of commercial power rectification module so as to not
Less than a default angle of flow limit value θmin.In the present embodiment, angle of flow limit value
Wherein UbusFor busbar voltage, ULLVirtual value for city's line voltage.Setting angle of flow limit value θminTo limit described switch unit
The angle of flow of part, so as to be unlikely to too small, so can prevent the angle of flow of described switch element from too small leading to described rectifier
Close, thus ensureing that commercial power rectification module is also not turn off in the case of solar energy abundance, needing, commercial power rectification module is defeated
When going out electric energy, commercial power rectification module can quickly respond, it is to avoid load power down.
Further, for control described switch element the angle of flow controlled quentity controlled variable be regulated quantity and default load compensation amount it
With the output of the algorithm of the angle of flow for controlling described switch element that described regulated quantity executes for commercial power rectification module.This
In embodiment, described algorithm adjusts algorithm for PI, and commercial power rectification module adjusts algorithm to control opening of its rectifier using PI
Close the angle of flow of element, PI adjusts the output of algorithm as regulated quantity, and regulated quantity adds default load compensation amount sum conduct
Described controlled quentity controlled variable, to accelerate the response speed of commercial power rectification module when solar energy becomes inadequate.Load is bigger, and load is mended
The amount of repaying is bigger, and in the present embodiment, the desirable scope of load compensation amount is 0 °～28 °, and load compensation amount is 0 ° in zero load,
It is 28 ° in full load.When solar energy is sufficient, the integral term that described PI adjusts algorithm is no longer cumulative, and proportional is zero, from
And allow the output of commercial power rectification module to fix it is ensured that the angle of flow of the switch element of rectifier is unlikely to too small.
Method given herein, all or part of step therein can be by setting up functional module construction, by computer program
Instruct control computer system to complete.These computer program instructions store in a computer-readable storage medium.
Finally it should be noted that above example is only in order to illustrating the technical scheme of the invention, rather than the present invention is created
Make the restriction of protection domain, although having made to explain to the invention with reference to preferred embodiment, the common skill of this area
Art personnel should be appreciated that and the technical scheme of the invention can be modified or equivalent, without deviating from the present invention
Create the spirit and scope of technical scheme.
Claims (8)
1. photovoltaic off-grid inverter control method, described photovoltaic off-grid inverter include commercial power rectification module, photovoltaic output control module,
Battery and bus, commercial power rectification module input connects civil power, and output end connects bus, and photovoltaic output control module inputs
End connects solar panels, and output end connects bus, and battery is charged from bus power taking or is discharged to bus, it is characterized in that,
Comprise the following steps：
If solar energy is sufficient, limit the angle of flow of the switch element of rectifier of commercial power rectification module so as to be not less than default
Angle of flow limit value θmin.
2. photovoltaic off-grid inverter control method according to claim 1, is characterized in that, default angle of flow limit valueWherein UbusFor busbar voltage, ULLVirtual value for city's line voltage.
3. photovoltaic off-grid inverter control method according to claim 1, is characterized in that, detects busbar voltage, if bus is electric
It is pressed in default voltage range, then show that solar energy is sufficient.
4. photovoltaic off-grid inverter control method according to claim 1, is characterized in that, for controlling described switch element
The controlled quentity controlled variable of the angle of flow is regulated quantity and default load compensation amount sum, and described regulated quantity is for controlling described switch unit
The output of the algorithm of the angle of flow of part.
5. photovoltaic off-grid inverter control device, described photovoltaic off-grid inverter include commercial power rectification module, photovoltaic output control module,
Battery and bus, commercial power rectification module input connects civil power, and output end connects bus, and photovoltaic output control module inputs
End connects solar panels, and output end connects bus, and battery is charged from bus power taking or is discharged to bus, it is characterized in that,
Including：
The first module run in the case of solar energy abundance, it limits leading of the switch element of rectifier of commercial power rectification module
Current flow angle, makes the described angle of flow be not less than default angle of flow limit value θmin.
6. photovoltaic off-grid inverter control device according to claim 5, is characterized in that, default angle of flow limit valueWherein UbusFor busbar voltage, ULLVirtual value for city's line voltage.
7. the control device of photovoltaic off-grid inverter according to claim 5, is characterized in that, also includes：
Second module, it detects busbar voltage, if busbar voltage is in default voltage range, shows that solar energy is sufficient.
8. photovoltaic off-grid inverter control device according to claim 5, is characterized in that, also include：
3rd module, it is used in the controlled quentity controlled variable of the angle of flow controlling described switch element is regulated quantity and default load compensation amount
Sum, described regulated quantity is the output of the algorithm of the angle of flow for controlling described switch element.
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| CN201510451369.9A CN106410933B (en) | 2015-07-28 | 2015-07-28 | Photovoltaic off-grid inverter control method and control device |
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| CN201510451369.9A CN106410933B (en) | 2015-07-28 | 2015-07-28 | Photovoltaic off-grid inverter control method and control device |
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| CN106410933B CN106410933B (en) | 2019-04-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765492A (en) * | 2019-01-09 | 2019-05-17 | 科华恒盛股份有限公司 | UPS energy storage battery test method and terminal device |
| CN113708405A (en) * | 2021-08-24 | 2021-11-26 | 深圳硕日新能源科技有限公司 | Energy storage off-grid inverter, control method thereof and energy storage off-grid inverter system |
| CN113949151A (en) * | 2021-10-19 | 2022-01-18 | 浙江德升新能源科技有限公司 | Black-start power supply circuit of energy storage converter |
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| US6268665B1 (en) * | 1999-05-10 | 2001-07-31 | Mutipower, Inc. | Testing battery power source of uninterruptible power supply |
| CN104113133A (en) * | 2014-07-01 | 2014-10-22 | 广东易事特电源股份有限公司 | Intelligent photovoltaic off-grid inverter system and power utilization control method thereof |
| CN104619083A (en) * | 2015-01-15 | 2015-05-13 | 生迪光电科技股份有限公司 | Compatible silicon controlled type constant voltage circuit, LED light conditioning circuit and LED lighting device |
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2015
- 2015-07-28 CN CN201510451369.9A patent/CN106410933B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6268665B1 (en) * | 1999-05-10 | 2001-07-31 | Mutipower, Inc. | Testing battery power source of uninterruptible power supply |
| CN104113133A (en) * | 2014-07-01 | 2014-10-22 | 广东易事特电源股份有限公司 | Intelligent photovoltaic off-grid inverter system and power utilization control method thereof |
| CN104619083A (en) * | 2015-01-15 | 2015-05-13 | 生迪光电科技股份有限公司 | Compatible silicon controlled type constant voltage circuit, LED light conditioning circuit and LED lighting device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109765492A (en) * | 2019-01-09 | 2019-05-17 | 科华恒盛股份有限公司 | UPS energy storage battery test method and terminal device |
| CN113708405A (en) * | 2021-08-24 | 2021-11-26 | 深圳硕日新能源科技有限公司 | Energy storage off-grid inverter, control method thereof and energy storage off-grid inverter system |
| CN113949151A (en) * | 2021-10-19 | 2022-01-18 | 浙江德升新能源科技有限公司 | Black-start power supply circuit of energy storage converter |
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| CN106410933B (en) | 2019-04-26 |
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