CN106410933B - 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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- CN106410933B CN106410933B CN201510451369.9A CN201510451369A CN106410933B CN 106410933 B CN106410933 B CN 106410933B CN 201510451369 A CN201510451369 A CN 201510451369A CN 106410933 B CN106410933 B CN 106410933B
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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
Photovoltaic off-grid inverter control method is related to photovoltaic off-grid inverter technical field, and this method controls computer system by establishing functional module construction, by computer program instructions to complete, these computer program instructions store in a computer-readable storage medium.The photovoltaic off-grid inverter includes commercial power rectification module, photovoltaic output control module, battery and bus, commercial power rectification module input connects alternating current, output end connects bus, photovoltaic output control module input terminal connects solar panels, output end connects bus, and battery takes electricity to carry out charge or discharge to bus, the control method from bus are as follows: if solar energy is sufficient, the angle of flow for then limiting the switch element of the rectifier of commercial power rectification module makes it not less than preset angle of flow limit value θmin.The case where can so preventing that the angle of flow of the switch element is too small and leading to rectifier block appearance, to guarantee that commercial power rectification module does not turn off in the case where solar energy abundance.
Description
Technical field
The invention is related to photovoltaic off-grid inverter technical field, and in particular to a kind of control of photovoltaic off-grid inverter
Method, this method control computer system by establishing functional module construction, by computer program instructions to complete, these are calculated
Machine program instruction stores in a computer-readable storage medium.
Background technique
Fig. 1 show traditional photovoltaic off-grid inverter, and when solar energy abundance, the electric energy that solar panels PV is generated is through photovoltaic
It is input to bus a after the transformation of output control module (such as MPPT module), if battery BAT underfill electricity, takes from bus a
Electricity charges, and inverter module takes electricity from bus a and carries out inversion, and then output to load is with powering load.If the sun
Can be inadequate, then from battery BAT to bussed supply, to maintain the power supply to load.If solar energy is inadequate and battery
BAT can not also power, then switch K1 is closed, and powered to the load by bypassing bypass, at this time once bypassing exception, necessarily cause to bear
Carry power down.
For this purpose, as shown in Fig. 2, increasing mains-supplied in bus bar side, alternating current AC is supplied after the module of commercial power rectification to bus a
Electricity, so that bus a be allowed to have tri- alternating current, solar energy and battery BAT power supply sources.In this way, in order to allow solar energy preferentially to bus a
The operating voltage point of power supply, setting photovoltaic output control module is higher than the operating voltage point of commercial power rectification module, the work of certain module
The target value of the voltage of control bus a when referring to module work as electrical voltage point.In this way, in the case where solar energy abundance, bus a
Voltage be controlled near the operating voltage point of photovoltaic output control module, commercial power rectification module at this time if work normally,
Because feedback quantity (actual value of the voltage of bus a) is greater than aim parameter (the operating voltage point of commercial power rectification module), cause alternating current whole
The angle of flow of the switch element (such as controllable silicon SCR) of the rectifier of flow module constantly reduces, will if the angle of flow is too small
Lead to rectifier block, commercial power rectification module is also with regard to this closing.After the closing of commercial power rectification module, if solar energy becomes unstable
It is fixed (i.e. solar energy when and it is sufficient, when and it is inadequate), once and battery capacity is insufficient, will result in inversion and export (i.e. by inverse
Become module output to power to the load) and frequent switching between output (being powered to the load by bypass bypass output) is bypassed, this
Do not allow.On the other hand, if bypass bypass is abnormal at this time, since commercial power rectification module is needed from output energy is started to
A period of time is undergone, during this period of time will lead to load power down.
Summary of the invention
For above-mentioned technical problem of the existing technology, the invention provides a kind of control of photovoltaic off-grid inverter
Method can guarantee that commercial power rectification module does not turn off in the case where solar energy abundance.
To achieve the above object, the invention provides following technical scheme.
Photovoltaic off-grid inverter control method, the photovoltaic off-grid inverter include commercial power rectification module, photovoltaic output control
Molding block, battery and bus, commercial power rectification module input connect alternating current, and output end connects bus, photovoltaic output control module
Input terminal connects solar panels, and output end connects bus, and battery takes electricity to carry out charge or discharge to bus from bus, including following
Step:
If solar energy is sufficient, the angle of flow of the switch element of the rectifier of commercial power rectification module is limited, it is not less than
Preset angle of flow limit value θmin。
Wherein, preset angle of flow limit valueWherein UbusFor busbar voltage, ULL
For the virtual value of city's line voltage.
Wherein, busbar voltage is detected, if busbar voltage in preset voltage range, shows solar energy abundance.
Further, the control amount of the angle of flow for controlling the switch element is regulated quantity and preset load compensation
The sum of amount, the regulated quantity are the output for controlling the algorithm of the angle of flow of the switch element.
The beneficial effect of the invention is: in the case where solar energy abundance, that is, from solar energy to bussed supply
When, the angle of flow of the switch element of the rectifier of commercial power rectification module is limited at this time, makes it not less than the preset angle of flow
Limit value θmin, the case where can so preventing the angle of flow of the switch element too small and leading to rectifier block appearance, thus
Guarantee commercial power rectification module solar energy abundance in the case where do not turn off, need commercial power rectification module output electric energy when
It waits, commercial power rectification module can quickly respond, and avoid load power down.In commercial power rectification module, photovoltaic output control module and
It is not needed in the case where communicating with each other between three modules of battery, work that yet can be orderly.
Detailed description of the invention
Fig. 1 is the structural block diagram of photovoltaic off-grid inverter；
Fig. 2 is the structural block diagram of another photovoltaic off-grid inverter.
Specific embodiment
It elaborates below in conjunction with specific embodiment to the invention.
The photovoltaic off-grid inverter of the present embodiment as shown in connection with fig. 2 is illustrated, and alternating current described in the present embodiment is three-phase city
Electricity.
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 are 405V.The control method of the photovoltaic off-grid inverter of the present embodiment, it is main to wrap
Include two big steps:
First, whether detection solar energy is sufficient.Specifically, the voltage for detecting bus a, under different degrees of solar energy,
Photovoltaic output control module is different to the voltage that bus a is provided, so as to judge that solar energy is by the voltage of bus a
No abundance.A voltage range is preset, such as not less than 420V, if detecting the voltage of bus a above-mentioned preset
In voltage range, such as 425V, then show that solar energy is sufficient at this time, if detecting the voltage of bus a not above-mentioned pre-
If voltage range in, such as 410V then shows that solar energy is insufficient at this time.
Second, if solar energy is sufficient, the angle of flow of the switch element of the rectifier of commercial power rectification module is just limited, it is made
Not less than one preset angle of flow limit value θmin.In the present embodiment, angle of flow limit value
Wherein UbusFor busbar voltage, ULLFor the virtual value of city's line voltage.Angle of flow limit value θ is setminTo limit the switch element
The angle of flow, so that it is unlikely to too small, can so prevent the angle of flow of the switch element is too small the rectifier is caused to close
It closes, to guarantee that commercial power rectification module will not close in the case where solar energy abundance, commercial power rectification module is being needed to export
When electric energy, commercial power rectification module can be quickly responded, and avoid load power down.
Further, the control amount of the angle of flow for controlling the switch element is regulated quantity and preset load compensation
The sum of amount, the regulated quantity are the defeated of the algorithm for the angle of flow for controlling the switch element that commercial power rectification module executes
Out.In the present embodiment, the algorithm is that PI adjusts algorithm, and commercial power rectification module adjusts algorithm using PI to control its rectifier
The angle of flow of switch element, PI adjust the output of algorithm as regulated quantity, and regulated quantity is made plus the sum of preset load compensation amount
For the control amount, to accelerate the response speed of commercial power rectification module when solar energy becomes inadequate.Load bigger, load benefit
The amount of repaying is bigger, and in the present embodiment, the desirable range of load compensation amount is 0 °~28 °, and load compensation amount is 0 ° in zero load,
Full load is 28 °.When solar energy abundance, the integral term that the PI adjusts algorithm is no longer cumulative, proportional zero, to allow alternating current
The output of rectification module is fixed, 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 the steps therein can be by establishing functional module construction, by computer
Program instruction controls computer system to complete.These computer program instructions store in a computer-readable storage medium.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the invention, rather than to this hair
It is bright create protection scope limitation, although being explained in detail referring to preferred embodiment to the invention, this field it is general
Lead to it will be appreciated by the skilled person that can be modified or replaced equivalently to the technical solution of the invention, without departing from this
The spirit and scope of innovation and creation technical solution.
Claims (8)
1. photovoltaic off-grid inverter control method, the photovoltaic off-grid inverter includes commercial power rectification module, photovoltaic output control
Module, battery and bus, commercial power rectification module input connect alternating current, and output end connects bus, and photovoltaic output control module is defeated
Enter end connection solar panels, output end connects bus, and battery takes electricity to carry out charge or discharge to bus from bus, characterized in that
The following steps are included:
If solar energy is sufficient, the angle of flow of the switch element of the rectifier of commercial power rectification module is limited, makes it not less than default
Angle of flow limit value θmin。
2. photovoltaic off-grid inverter control method according to claim 1, characterized in that preset angle of flow limit valueWherein UbusFor busbar voltage, ULLFor the virtual value of city's line voltage.
3. photovoltaic off-grid inverter control method according to claim 1, characterized in that detection busbar voltage, if bus
Voltage then shows solar energy abundance in preset voltage range.
4. photovoltaic off-grid inverter control method according to claim 1, characterized in that for controlling the switch element
The control amount of the angle of flow be the sum of regulated quantity and preset load compensation amount, the regulated quantity is first for controlling the switch
The output of the algorithm of the angle of flow of part.
5. photovoltaic off-grid inverter control device, the photovoltaic off-grid inverter includes commercial power rectification module, photovoltaic output control
Module, battery and bus, commercial power rectification module input connect alternating current, and output end connects bus, and photovoltaic output control module is defeated
Enter end connection solar panels, output end connects bus, and battery takes electricity to carry out charge or discharge to bus from bus, characterized in that
Include:
The first module run in the case where solar energy abundance, limits the switch element of the rectifier of commercial power rectification module
The angle of flow makes the angle of flow not less than preset angle of flow limit value θmin。
6. photovoltaic off-grid inverter control device according to claim 5, characterized in that preset angle of flow limit valueWherein UbusFor busbar voltage, ULLFor the virtual value of city's line voltage.
7. the control device of photovoltaic off-grid inverter according to claim 5, characterized in that further include:
Second module detects busbar voltage, if busbar voltage in preset voltage range, shows solar energy abundance.
8. photovoltaic off-grid inverter control device according to claim 5, characterized in that further include:
Third module, being used in and controlling the control amount of the angle of flow of the switch element is regulated quantity and preset load compensation
The sum of amount, the regulated quantity are the output for controlling the algorithm of the angle of flow of the switch element.
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| Application Number | Priority Date | Filing Date | Title |
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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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| CN106410933A CN106410933A (en) | 2017-02-15 |
| CN106410933B true CN106410933B (en) | 2019-04-26 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN113708405B (en) * | 2021-08-24 | 2022-08-16 | 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 |
| CN113949151B (en) * | 2021-10-19 | 2024-09-03 | 浙江德升新能源科技有限公司 | Energy storage converter black start power supply circuit |
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 |
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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 |
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