CN107834836A - A kind of photovoltaic DC-to-AC converter starts method - Google Patents
A kind of photovoltaic DC-to-AC converter starts method Download PDFInfo
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- CN107834836A CN107834836A CN201711121482.6A CN201711121482A CN107834836A CN 107834836 A CN107834836 A CN 107834836A CN 201711121482 A CN201711121482 A CN 201711121482A CN 107834836 A CN107834836 A CN 107834836A
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- photovoltaic
- converter
- power
- threshold value
- power output
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000007958 sleep Effects 0.000 claims abstract description 20
- 238000010248 power generation Methods 0.000 claims abstract description 11
- 238000005286 illumination Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 9
- 230000009885 systemic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000002618 waking effect Effects 0.000 description 2
- 241000112598 Pseudoblennius percoides Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 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
- 238000005516 engineering process Methods 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
- 230000010349 pulsation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
-
- 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 converter to start method, is related to technical field of photovoltaic power generation, this method includes：After auxiliary power start, photovoltaic DC-to-AC converter enters wait state, execution etc. is to be operated, photovoltaic DC-to-AC converter is set to enter sleep pattern by MPPT algorithm, the driving closed 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 power output 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 perform MPPT algorithm and the power output 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 relatively low, 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 technology
Photovoltaic DC-to-AC converter is a kind of power adjusting device being made up of semiconductor devices, and it generates electricity applied to photovoltaic solar
In system, for the converting direct-current power into alternating-current power for exporting the solar panel in photovoltaic solar electricity generation system and output
To the equipment of AC load, one of the nucleus equipment as photovoltaic solar electricity generation system, the quality of its performance is realizing the sun
Can be with being played 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, drive circuit and accessory power supply,
Accessory power supply connects the dc bus of photovoltaic DC-to-AC converter, the power taking and be control unit and drive circuitry from dc bus,
Control unit controls the work of whole photovoltaic DC-to-AC converter, and drive 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 startup voltage of accessory power supply, auxiliary power start, and then start control unit and drive circuit so that whole photovoltaic is inverse
Become device to start, direct current is converted to alternating current and exports the equipment to AC load by power network by photovoltaic DC-to-AC converter.But photovoltaic
For inverter when upper electric, accessory power supply, control unit and drive circuit are required for absorbing certain power, and as shown in Figure 2
Power voltage (PV) curve of solar panel understand, in the morning with dusk etc illumination it is insufficient in the case of, the sun
The power very little that energy cell panel can be provided, load capacity is very low, and the open-circuit voltage of solar panel is very high, accessory power supply
Upon actuation, the power of solar panel output generally can not bear accessory power supply, cause accessory power supply to be closed, now the sun
Equivalent to open circuit, its very high open-circuit voltage can cause accessory power supply to be again started up, go round and begin again energy cell panel again, cause auxiliary
The frequent start-stop of power supply is helped, 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, the life-span of photovoltaic DC-to-AC converter is influenceed, can also impact power network and pollute, and in more photovoltaic DC-to-AC converters simultaneously
If started shooting in the case of connection simultaneously, other photovoltaic inversions can be caused because of the voltage pulsation harmonic of a photovoltaic DC-to-AC converter
Device all can not normal boot-strap, influence the normal work of whole photovoltaic solar electricity generation system.
The content of the invention
The present inventor is regarding to the issue above and technical need, it is proposed that a kind of photovoltaic DC-to-AC converter starts 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 relatively low is reduced greatly, protects machine same
When reduce pollution to power network and the influence of the other machines to parallel connection.
Technical scheme is as follows：
A kind of photovoltaic DC-to-AC converter starts method, and this method includes：
After auxiliary power start, photovoltaic DC-to-AC converter enters wait state, performs etc. to be operated, waits to be operated comprise at least
System initialization operation, countdown operation, detect each protection location whether normal work and attracting electric relay；
Photovoltaic DC-to-AC converter is set to enter sleep pattern by MPPT algorithm, the driving closed 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 power output of photovoltaic DC-to-AC converter reaches variable quantity threshold value, and variable quantity threshold value is currently detected
Difference or ratio between power output and the last power output detected；
If power variation reaches variable quantity threshold value, start normal power generation, and perform MPPT algorithm to photovoltaic DC-to-AC converter
Power output be tracked.
Its further technical scheme is that this method also includes：
Whether the power output of detection photovoltaic DC-to-AC converter reaches power threshold；
If the power output of photovoltaic DC-to-AC converter is not up to power threshold, execution passes through MPPT maximum power point tracking MPPT algorithm
The step of making photovoltaic DC-to-AC converter enter sleep pattern.
Its further technical scheme is that this method also includes：
If power variation is not up to variable quantity threshold value, photovoltaic DC-to-AC converter is controlled to reenter sleep by MPPT algorithm
Pattern, the driving being again switched off in photovoltaic DC-to-AC converter.
Its further technical scheme is that this method also includes：
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, the step for controlling photovoltaic DC-to-AC converter to reenter sleep pattern by MPPT algorithm is performed
Suddenly；
If reaching frequency threshold value, re-execute photovoltaic DC-to-AC converter and enter the step to be operated such as wait state, execution.
The method have the benefit that：
1st, when photovoltaic DC-to-AC converter is under normal power generation state, photovoltaic DC-to-AC converter is made in sleep pattern by MPPT algorithm
Switch between awakening mode, avoid photovoltaic DC-to-AC converter and directly start frequently to weigh caused by generating electricity when power output is smaller
Open so that machine greatly reduces because the number restarted caused by curve energy hour tracking MPPT, protects photovoltaic inversion
Device.
2nd, the pollution to power network is reduced, while reduces the influence of the other machines to parallel connection.
3rd, the startup method need not change the hardware configuration of existing photovoltaic DC-to-AC converter, and implementation is simple.
Brief description of the drawings
Fig. 1 is the structural representation 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 that photovoltaic DC-to-AC converter disclosed in the present application starts method.
Fig. 4 is the Booting sequence schematic diagram that photovoltaic DC-to-AC converter disclosed in the present application starts method.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings.
This application discloses a kind of photovoltaic DC-to-AC converter to start method, and this method is applied in existing photovoltaic DC-to-AC converter, no
Need to change the hardware of existing photovoltaic DC-to-AC converter, mainly include 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, flow
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 startup voltage of accessory power supply, auxiliary power start, system electrification, now photovoltaic DC-to-AC converter is in upper
Electricity condition, and enter wait state after the completion of upper electricity, control unit execution etc. is to be operated, waits to be operated include but is not limited to：
Carry out system initialization operation, countdown operation, detect each protection location whether normal work and adhesive and 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 to power output, and performs 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 close restart, this
In the case of, photovoltaic DC-to-AC converter can reenter wait state and re-execute above-mentioned etc. to be operated, influence the life-span of component.Cause
This in this application, photovoltaic DC-to-AC converter not is directly to start to generate electricity after normal power generation state is entered, but starts to perform
MPPT sleeps with waking up algorithm, and MPPT sleeps specifically comprise the following steps with waking up algorithm, as shown in Figure 4：
Step 1：Whether the power output that control unit constantly detects photovoltaic DC-to-AC converter reaches power threshold, the power threshold
For systemic presupposition value or User Defined value, typically an empirical value.
Step 2：If the power output of photovoltaic DC-to-AC converter is not up to power threshold, then it represents that power output very little, may
Cause accessory power supply to be closed to restart, therefore in this application, control unit makes photovoltaic DC-to-AC converter enter sleep by MPPT algorithm
Pattern, the driving closed in photovoltaic DC-to-AC converter so that all power components in photovoltaic DC-to-AC converter are all stopped, photovoltaic inversion
Device is forbidden generating electricity, but now photovoltaic DC-to-AC converter is in normal power generation state, does not return to wait state and re-executes.It is logical
In the case of often, under low light environment, the power output of photovoltaic DC-to-AC converter is all not up to power threshold, if examining in a practical situation
The power output for measuring photovoltaic DC-to-AC converter reaches power threshold, then terminates flow, normally starts to generate electricity.
Step 3：After photovoltaic DC-to-AC converter is entered sleep pattern, interval wakes up light by MPPT algorithm at predetermined time intervals
Inverter is lied prostrate, opens the driving in photovoltaic DC-to-AC converter, whether the power variation for detecting the power output of photovoltaic DC-to-AC converter reaches
Variable quantity threshold value, wherein variable quantity threshold value are between currently detected power output and the last power output detected
Difference or ratio.Wherein, predetermined time interval is systemic presupposition value or User Defined value, for example be could be arranged to 5 minutes；Become
Change amount threshold value is also systemic presupposition value or User Defined value.
Step 4：If power variation reaches variable quantity threshold value, start normal power generation, and perform MPPT algorithm to photovoltaic
The power output of inverter carries out normal curve tracing.
Step 5：If power variation is not up to variable quantity threshold value, detection photovoltaic DC-to-AC converter continuously enters sleep pattern
Whether number reaches frequency threshold value, and frequency threshold value is systemic presupposition value or User Defined value, for example be could be arranged 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 control photovoltaic DC-to-AC converter to reenter sleep pattern by MPPT algorithm, be again switched off photovoltaic inversion
Driving in device, wait 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 photovoltaic DC-to-AC converter is come back to wait state, re-execute etc. to be operated.
Above-described is only the preferred embodiment of the present invention, and the invention is not restricted to above example.It is appreciated that this
Other improvement and become that art personnel directly export or associated without departing from the spirit and concept in the present invention
Change, be considered as being included within protection scope of the present invention.
Claims (4)
1. a kind of photovoltaic DC-to-AC converter starts method, it is characterised in that methods described includes：
After auxiliary power start, photovoltaic DC-to-AC converter enters wait state, perform etc. it is to be operated, it is described etc. to be operated to comprise at least
System initialization operation, countdown operation, detect each protection location whether normal work and attracting electric relay；
The photovoltaic DC-to-AC converter is entered sleep pattern by MPPT maximum power point tracking MPPT algorithm, close the photovoltaic DC-to-AC converter
In driving；
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 power output of the photovoltaic DC-to-AC converter reaches variable quantity threshold value, the variable quantity threshold value
Difference or ratio between currently detected power output and the last power output detected；
If the power variation reaches the variable quantity threshold value, start normal power generation, and perform MPPT algorithm to the light
The power output of volt inverter is tracked.
2. according to the method for claim 1, it is characterised in that methods described also includes：
Whether the power output for detecting the photovoltaic DC-to-AC converter reaches power threshold；
If the power output 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, it is characterised in that methods described 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 for claim 3, it is characterised in that methods described also includes：
Detect the photovoltaic DC-to-AC converter and continuously enter the number of sleep pattern and whether reach frequency threshold value；
If not up to described frequency threshold value, execution is described to control the photovoltaic DC-to-AC converter to reenter sleep by MPPT algorithm
The step of pattern；
If reaching the frequency threshold value, re-execute the photovoltaic DC-to-AC converter and enter the step to be operated such as wait state, execution
Suddenly.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711121482.6A CN107834836B (en) | 2017-11-14 | 2017-11-14 | A kind of photovoltaic DC-to-AC converter starting method |
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| CN201711121482.6A CN107834836B (en) | 2017-11-14 | 2017-11-14 | A kind of photovoltaic DC-to-AC converter starting method |
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| CN107834836B CN107834836B (en) | 2019-09-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737304A (en) * | 2021-04-06 | 2021-04-30 | 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 |
| 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 |
| CN114144952A (en) * | 2019-07-25 | 2022-03-04 | 智能追踪识别有限公司 | Circuit for supplying power to centrifugal pump |
| CN116885964A (en) * | 2023-09-06 | 2023-10-13 | 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 |
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| 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 |
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| CN107834836B (en) | 2019-09-20 |
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Address after: 215000 factory building 6, No. 2, xijinzhi Road, high tech Zone, Suzhou City, Jiangsu Province Patentee after: Jiangsu natong Energy Technology Co.,Ltd. Address before: 215000 factory building 6, No. 2, xijinzhi Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: JIANGSU JIAXUN NATONG ENERGY TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20210322 Address after: 215000 factory building C-12, comprehensive tax declaration area, No.20 Datong Road, high tech Zone, Suzhou City, Jiangsu Province Patentee after: Suzhou Nantong Power Technology Co.,Ltd. Address before: 215000 No.6 workshop, No.2 xijinzhi Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: Jiangsu natong Energy Technology Co.,Ltd. |
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Effective date of registration: 20221122 Address after: No. C12, Comprehensive Bonded Zone, No. 1, Zone 5, No. 20, Datong Road, High tech Zone, Suzhou City, Jiangsu Province, 215000 Patentee after: Jiangsu natong Energy Technology Co.,Ltd. Address before: 215000 factory building C-12, comprehensive tax declaration area, No.20 Datong Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: Suzhou Nantong Power Technology Co.,Ltd. |