CN107834836B - A kind of photovoltaic DC-to-AC converter starting method - Google Patents
A kind of photovoltaic DC-to-AC converter starting method Download PDFInfo
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- CN107834836B CN107834836B CN201711121482.6A CN201711121482A CN107834836B CN 107834836 B CN107834836 B CN 107834836B CN 201711121482 A CN201711121482 A CN 201711121482A CN 107834836 B CN107834836 B CN 107834836B
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- mppt algorithm
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000007958 sleep Effects 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 14
- 238000005286 illumination Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 10
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000009885 systemic effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 241000112598 Pseudoblennius percoides Species 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
-
- 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 photovoltaic DC-to-AC converters to start method, it is related to technical field of photovoltaic power generation, this method comprises: after auxiliary power start, photovoltaic DC-to-AC converter enters wait state, it executes and waits operation, photovoltaic DC-to-AC converter is set to enter sleep pattern by MPPT algorithm, close the driving in photovoltaic DC-to-AC converter, interval wakes up photovoltaic DC-to-AC converter by MPPT algorithm at predetermined time intervals, open the driving in photovoltaic DC-to-AC converter, whether the power variation for detecting the output power of photovoltaic DC-to-AC converter reaches variable quantity threshold value, if power variation reaches variable quantity threshold value, then start normal power generation, and it executes MPPT algorithm and the output power of photovoltaic DC-to-AC converter is tracked；This method greatly reduces the number restarted when photovoltaic DC-to-AC converter starts under the weaker environment of illumination because energy is lower, protects machine.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, especially a kind of photovoltaic DC-to-AC converter starts method.
Background technique
Photovoltaic DC-to-AC converter is a kind of power adjusting device being made of semiconductor devices, is applied to photovoltaic solar and generates electricity
Converting direct-current power into alternating-current power and output in system, for exporting the solar panel in photovoltaic solar electricity generation system
To the equipment of AC load, the quality of one of core equipment as photovoltaic solar electricity generation system, performance is realizing the sun
Can with play a key effect in the conversion of electric energy.
As shown in Figure 1, photovoltaic DC-to-AC converter generally comprises inverse switch circuit, control unit, driving circuit and accessory power supply,
Accessory power supply connects the DC bus of photovoltaic DC-to-AC converter, takes electricity and from DC bus for control unit and drive circuitry,
Control unit controls the work of entire photovoltaic DC-to-AC converter, and driving circuit drives each power component in photovoltaic DC-to-AC converter.When too
Sun rise when, solar panel via photovoltaic DC-to-AC converter DC bus output voltage, when DC bus output voltage reach
To after the starting voltage of accessory power supply, auxiliary power start, and then start control unit and driving circuit, so that entire photovoltaic is inverse
Become device starting, direct current is converted to alternating current and exported by power grid to the equipment of AC load by photovoltaic DC-to-AC converter.But photovoltaic
When powering on, accessory power supply, control unit and driving circuit require to absorb certain power inverter, and as shown in Figure 2
Power voltage (PV) curve of solar panel is it is found that in the insufficient situation of illumination in the morning and at dusk etc, the sun
The power very little that energy solar panel can be provided, load capacity is very low, and the open-circuit voltage of solar panel is very high, accessory power supply
After actuation, the power of solar panel output generally can not bear accessory power supply, cause accessory power supply to be closed, at this time the sun
Energy solar panel is equivalent to open circuit, and very high open-circuit voltage can make accessory power supply be again started up again, in cycles, cause auxiliary
The frequent start-stop for helping power supply has in turn resulted in the frequent start-stop of photovoltaic DC-to-AC converter, this not only results in each in photovoltaic DC-to-AC converter
Device aging and damage influence the service life of photovoltaic DC-to-AC converter, can also impact power grid and pollute, and more photovoltaic DC-to-AC converters simultaneously
If being switched on simultaneously in the case where connection, other photovoltaic inversions can be caused because of the voltage fluctuation harmony waveguide of a photovoltaic DC-to-AC converter
Device all can not normal boot-strap, influence the normal work of entire photovoltaic solar electricity generation system.
Summary of the invention
The present inventor regarding to the issue above and technical need, proposes a kind of photovoltaic DC-to-AC converter starting method, and this method is big
The number restarted when photovoltaic DC-to-AC converter starts under the weaker environment of illumination because energy is lower is reduced greatly, protects machine same
When reduce pollution to power grid and the influence to other machines in parallel.
Technical scheme is as follows:
A kind of photovoltaic DC-to-AC converter starting method, this method comprises:
After auxiliary power start, photovoltaic DC-to-AC converter enters wait state, executes and waits operation, and operation is waited to include at least
Whether system initialization operation, countdown operation detect each protection location and work normally and attracting electric relay；
So that photovoltaic DC-to-AC converter is entered sleep pattern by MPPT algorithm, closes the driving in photovoltaic DC-to-AC converter；
Interval wakes up photovoltaic DC-to-AC converter by MPPT algorithm at predetermined time intervals, opens the driving in photovoltaic DC-to-AC converter, inspection
Whether the power variation for surveying the output power of photovoltaic DC-to-AC converter reaches variable quantity threshold value, and power variation is currently detected
Difference or ratio between output power and the last output power detected；
If power variation reaches variable quantity threshold value, start normal power generation, and executes MPPT algorithm to photovoltaic DC-to-AC converter
Output power be tracked.
Its further technical solution is this method further include:
Whether the output power of detection photovoltaic DC-to-AC converter reaches power threshold；
If the output power of photovoltaic DC-to-AC converter is not up to power threshold, executes and pass through MPPT maximum power point tracking MPPT algorithm
The step of making photovoltaic DC-to-AC converter enter sleep pattern.
Its further technical solution is this method further include:
If power variation is not up to variable quantity threshold value, photovoltaic DC-to-AC converter is controlled by MPPT algorithm and reenters sleep
Mode, the driving being again switched off in photovoltaic DC-to-AC converter.
Its further technical solution is this method further include:
Whether the number that detection photovoltaic DC-to-AC converter continuously enters sleep pattern reaches frequency threshold value；
If not up to frequency threshold value, executes and the step that photovoltaic DC-to-AC converter reenters sleep pattern is controlled by MPPT algorithm
Suddenly；
If reaching frequency threshold value, re-executes photovoltaic DC-to-AC converter and enter wait state, execute the step of waiting operation.
The method have the benefit that:
1, when photovoltaic DC-to-AC converter is under normal power generation state, make photovoltaic DC-to-AC converter in sleep pattern by MPPT algorithm
Switch between awakening mode, avoids photovoltaic DC-to-AC converter and directly start frequent weight caused by power generation when output power is smaller
It opens, so that machine greatly reduces because the number restarted caused by curve energy hour tracking MPPT, protects photovoltaic inversion
Device.
2, the pollution to power grid is reduced, while reducing the influence to other machines in parallel.
3, the starting method haves no need to change the hardware configuration of existing photovoltaic DC-to-AC converter, and implementation is simple.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing photovoltaic DC-to-AC converter.
Fig. 2 is the power voltage curve of solar panel.
Fig. 3 is the Booting sequence schematic diagram of photovoltaic DC-to-AC converter starting method disclosed in the present application.
Fig. 4 is the Booting sequence schematic diagram of photovoltaic DC-to-AC converter starting method disclosed in the present application.
Specific embodiment
The following further describes the specific embodiments of the present invention with reference to the drawings.
This application discloses a kind of photovoltaic DC-to-AC converters to start method, and this method is applied in existing photovoltaic DC-to-AC converter, no
It needs to change the hardware of existing photovoltaic DC-to-AC converter, mainly includes inverse switch circuit, control unit, driving in photovoltaic DC-to-AC converter
Circuit and accessory power supply, structure chart are referred to Fig. 1.Based on existing photovoltaic DC-to-AC converter, this method comprises the following steps, process
Schematic diagram is as shown in Figure 3:
When the sun gradually rises, solar panel output voltage to DC bus, when DC bus is exported to auxiliary
When the voltage of power supply reaches the starting voltage of accessory power supply, auxiliary power start, system electrification, photovoltaic DC-to-AC converter is in upper at this time
Electricity condition, and enter wait state after the completion of powering on, control unit, which executes, waits operation, and waiting operation includes but is not limited to:
It carries out system initialization operation, countdown operation, detect whether each protection location works normally and be attracted simultaneously network relay
And other each relays.
According to the start-up course of existing photovoltaic DC-to-AC converter, photovoltaic DC-to-AC converter has been inspected by power-up state and wait state
Bi Houhui enters normal power generation state, can start normal power generation and according to MPPT (Maximum Power Point Tracking,
MPPT maximum power point tracking) algorithm is tracked output power, and executes all kinds of detection operations, such as: power network current detection, electricity
Net frequency detecting, network voltage detection, DCI (Direct Current Injection, DC current injection) detection, GFCI
It is (Ground Fault Circuit Interrupter, earth-fault current earth leakage protective device) detection, input voltage measurement, defeated
Enter the DC bus-bar voltages such as current detecting detection etc..But as stated in the background art, photovoltaic DC-to-AC converter on startup, if illumination condition
It is too weak, then may cause at any time DC bus export to accessory power supply voltage too it is low make accessory power supply closing restart, this
In the case of, photovoltaic DC-to-AC converter can reenter wait state and re-execute above-mentioned waiting operation, influence the service life of component.Cause
This in this application, photovoltaic DC-to-AC converter enter normal power generation state after be not directly to start to generate electricity, but start to execute
MPPT sleep and wake-up algorithm, which sleeps specifically comprises the following steps with wake-up algorithm, as shown in Figure 4:
Step 1: whether the output power that control unit constantly detects photovoltaic DC-to-AC converter reaches power threshold, the power threshold
For systemic presupposition value or user's self-defining value, usually an empirical value.
Step 2: if the output power of photovoltaic DC-to-AC converter is not up to power threshold, then it represents that output power very little, it may
Accessory power supply closing is caused to be restarted, therefore in this application, control unit makes photovoltaic DC-to-AC converter enter sleep by MPPT algorithm
Mode closes the driving in photovoltaic DC-to-AC converter, so that all power components in photovoltaic DC-to-AC converter all stop working, photovoltaic inversion
Device is forbidden generating electricity, but photovoltaic DC-to-AC converter is in normal power generation state at this time, does not return to wait state and re-executes.It is logical
In normal situation, under low light environment, the output power of photovoltaic DC-to-AC converter is all not up to power threshold, if examining in a practical situation
The output power for measuring photovoltaic DC-to-AC converter reaches power threshold, then terminates process, normally starts to generate electricity.
Step 3: after making photovoltaic DC-to-AC converter enter sleep pattern, interval wakes up light by MPPT algorithm at predetermined time intervals
Inverter is lied prostrate, the driving in photovoltaic DC-to-AC converter is opened, whether the power variation for detecting the output power of photovoltaic DC-to-AC converter reaches
Variable quantity threshold value, wherein power variation is between currently detected output power and the last output power detected
Difference or ratio.Wherein, predetermined time interval is systemic presupposition value or user's self-defining value, for example be can be set to 5 minutes；Become
Change amount threshold value is also systemic presupposition value or user's self-defining value.
Step 4: if power variation reaches variable quantity threshold value, starting normal power generation, and execute MPPT algorithm to photovoltaic
The output power of inverter carries out normal curve tracing.
Step 5: if power variation is not up to variable quantity threshold value, detecting photovoltaic DC-to-AC converter and continuously enter sleep pattern
Whether number reaches frequency threshold value, and frequency threshold value is systemic presupposition value or user's self-defining value, for example be can be set to 10 times.
Step 6: if power variation is not up to variable quantity threshold value, and photovoltaic DC-to-AC converter continuously enters the number of sleep pattern
Not up to frequency threshold value then controls photovoltaic DC-to-AC converter by MPPT algorithm and reenters sleep pattern, is again switched off photovoltaic inversion
Driving in device waits wake-up next time.
Step 7: if power variation is not up to variable quantity threshold value, and photovoltaic DC-to-AC converter continuously enters the number of sleep pattern
Reach frequency threshold value, then so that photovoltaic DC-to-AC converter is come back to wait state, re-executes waiting operation.
What has been described above is only a preferred embodiment of the present invention, and present invention is not limited to the above embodiments.It is appreciated that this
The other improvements and change that field technical staff directly exports or associates without departing from the spirit and concept in the present invention
Change, is considered as being included within protection scope of the present invention.
Claims (4)
1. a kind of photovoltaic DC-to-AC converter starts method, which is characterized in that the described method includes:
After auxiliary power start, photovoltaic DC-to-AC converter enters wait state, executes and waits operation, and the waiting operation includes at least
Whether system initialization operation, countdown operation detect each protection location and work normally and attracting electric relay；
The photovoltaic DC-to-AC converter keeps the photovoltaic inverse after entering normal power generation state by MPPT maximum power point tracking MPPT algorithm
Become device and enter sleep pattern, close the driving in the photovoltaic DC-to-AC converter but keeps in normal power generation state；
Interval wakes up the photovoltaic DC-to-AC converter by MPPT algorithm at predetermined time intervals, opens the drive in the photovoltaic DC-to-AC converter
Dynamic, whether the power variation for detecting the output power of the photovoltaic DC-to-AC converter reaches variable quantity threshold value, the power variation
Difference or ratio between currently detected output power and the last output power detected；
If the power variation reaches the variable quantity threshold value, start normal power generation, and executes MPPT algorithm to the light
The output power of volt inverter is tracked.
2. the method according to claim 1, wherein the method also includes:
Whether the output power for detecting the photovoltaic DC-to-AC converter reaches power threshold；
If the output power of the photovoltaic DC-to-AC converter is not up to the power threshold, pass through MPPT maximum power point tracking described in execution
The step of MPPT algorithm makes the photovoltaic DC-to-AC converter enter sleep pattern.
3. method according to claim 1 or 2, which is characterized in that the method also includes:
If the power variation is not up to the variable quantity threshold value, the photovoltaic DC-to-AC converter is controlled again by MPPT algorithm
Into sleep pattern, the driving being again switched off in the photovoltaic DC-to-AC converter.
4. according to the method described in claim 3, it is characterized in that, the method also includes:
It detects the photovoltaic DC-to-AC converter and continuously enters the number of sleep pattern and whether reach frequency threshold value；
If the not up to described frequency threshold value, the photovoltaic DC-to-AC converter is controlled by MPPT algorithm described in execution and reenters sleep
The step of mode；
If reaching the frequency threshold value, re-executes the photovoltaic DC-to-AC converter and enter wait state, execute the step for waiting operation
Suddenly.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| ES2753221B2 (en) * | 2019-07-25 | 2020-11-05 | Eos Itr S L | ELECTRICAL CIRCUIT FOR SUPPLYING CENTRIFUGAL PUMPS |
| CN112803741A (en) * | 2020-12-31 | 2021-05-14 | 航天柏克(广东)科技有限公司 | Automatic start-stop control method and circuit for photovoltaic system inverter |
| CN112737304B (en) * | 2021-04-06 | 2021-07-06 | 浙江艾罗网络能源技术股份有限公司 | Starting control method of photovoltaic inverter and photovoltaic inverter system |
| CN116885964B (en) * | 2023-09-06 | 2023-12-05 | 浙江华昱欣科技有限公司 | Control method and device of photovoltaic inverter, electronic device and storage medium |
| CN117220601A (en) * | 2023-09-14 | 2023-12-12 | 广州菲利斯太阳能科技有限公司 | Photovoltaic inverter input power detection device and photovoltaic inverter input control method |
| CN117792064B (en) * | 2024-02-28 | 2024-05-07 | 美世乐(广东)新能源科技有限公司 | Auxiliary power supply system of photovoltaic inverter |
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| CN104333215A (en) * | 2014-11-25 | 2015-02-04 | 阳光电源股份有限公司 | Method and device for suppressing frequent starting and stopping of inverter |
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| CN106253332A (en) * | 2016-08-18 | 2016-12-21 | 江苏兆伏爱索新能源有限公司 | A kind of photovoltaic DC-to-AC converter starts method, device and the photovoltaic DC-to-AC converter controlled |
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Patent Citations (4)
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| CN104158218A (en) * | 2014-08-27 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter starting control method and system and photovoltaic power generation system |
| CN104333215A (en) * | 2014-11-25 | 2015-02-04 | 阳光电源股份有限公司 | Method and device for suppressing frequent starting and stopping of inverter |
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