CN102253278B - Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current) - Google Patents

Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current) Download PDF

Info

Publication number
CN102253278B
CN102253278B CN201110104215.4A CN201110104215A CN102253278B CN 102253278 B CN102253278 B CN 102253278B CN 201110104215 A CN201110104215 A CN 201110104215A CN 102253278 B CN102253278 B CN 102253278B
Authority
CN
China
Prior art keywords
voltage
solar panel
inverter
constantly
detection method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201110104215.4A
Other languages
Chinese (zh)
Other versions
CN102253278A (en
Inventor
谭钧承
徐锡军
张彦虎
朱军卫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Chint Power Systems Co ltd
Original Assignee
SHANGHAI CHINT POWER SYSTEMS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHANGHAI CHINT POWER SYSTEMS CO Ltd filed Critical SHANGHAI CHINT POWER SYSTEMS CO Ltd
Priority to CN201110104215.4A priority Critical patent/CN102253278B/en
Publication of CN102253278A publication Critical patent/CN102253278A/en
Application granted granted Critical
Publication of CN102253278B publication Critical patent/CN102253278B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Inverter Devices (AREA)

Abstract

The invention discloses a startup condition detection method suitable for photovoltaic inverter with DC/DC(direct current/direct current). A DC/DC circuit extracts energy from a solar cell panel PV and stores the energy on a BUS capacitor C2; the output power of the solar cell panel PV is calculated according to the change of energy storage of the BUS capacitor in unit time, thereby realizing relatively high voltage sampling precision; and meanwhile, as the no-load power consumption of a specific inverter can be tested in advance, the method of the scheme can relatively accurately judge whether the maximum output power of the solar cell panel is greater than the no-load power consumption of the inverter, and can start up in real time according to the test result and combine grid for generation so as to sufficiently utilize the solar energy output by the solar cell panel without increasing the hardware cost.

Description

A kind of compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC
Technical field
The present invention relates to the energy storage conversion equipment field that photovoltaic combining inverter or other input sources are solar panel, specifically a kind of compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC.
Background technology
The function of photovoltaic combining inverter is that the DC current that solar panel is sent is converted into and the alternating electromotive force of public electric wire net with frequency homophase, is fed in electrical network.
As shown in Figure 1, be the output characteristic curve of solar panel under different illumination intensity.Due to from night to daytime the sun intensity of illumination increase gradually, the peak power that solar panel can be exported has a process increasing gradually.And along with the open circuit voltage variations of the variation solar panel of intensity of illumination is little.Only according to the open-circuit voltage of solar panel, judge when inverter start operation is irrational, because inverter is once start operation will exist a larger loss.If this loss is greater than the peak power that solar panel can provide, that inverter will consume the energy of electrical network, does not reach the object of generating electricity by way of merging two or more grid systems.Now inverter detects output power and is less than zero, and inverter is by out of service, thereby the repeated multiple times switching on and shutting down that cause will reduce the serviceable life of inverter.If only judge that according to the open-circuit voltage of solar panel when inverter start exists another problem is exactly to have started evening, can not make full use of the output energy of cell panel, loss can generated output.
Therefore, how accurately judging the output power ability of cell panel, according to its output power ability, start in time grid-connected inverters work, to make full use of solar electrical energy generation, is the problem that inverter need to solve.Existing start method of testing as shown in Figure 2, increases an auxiliary switch Q2 and a test resistance R1 on original inverter, to realize the exportable power test function of input cell panel.Resistance R 1 one end is connected with the positive pole of input solar panel, and the other end is connected with the collector of auxiliary switch Q1, and the emitter of auxiliary switch is connected with the negative pole of input solar panel.Wherein the value of resistance 1R is chosen as (the minimum operating voltage of inverter square/inverter no-load power consumption).The optional MOSFET of auxiliary switch, IGBT or relay etc. similarly has the device of switching characteristic.
When input voltage reaches default start thresholding, control auxiliary switch open-minded in short-term, resistance R 1 will be added in and input on cell panel as load like this, by the cell plate voltage after stable testing, judge cell panel output power ability.If inverter input voltage, still higher than minimum operating voltage, shows that the output power of cell panel is greater than the no-load power consumption of inverter after stable, show that inverter can be started shooting to generate electricity by way of merging two or more grid systems, control auxiliary switch and disconnect, start inverter work; Otherwise, if now inverter input voltage is lower than minimum operating voltage, show to input the exportable power of maximum of solar panel lower than the open circuit loss of inverter, inverter should not be started shooting, continue test (or for avoiding resistance to power up for a long time causing overheated, can consider that auxiliary switch temporarily disconnects, commissioning again after time delay), until meet compressor start up condition.
In this scheme, the precision of voltage sample is higher, resistance is predeterminable, simultaneously for specific inverter, its no-load power consumption can be tested and obtain in advance, therefore by the test circuit of this scheme, can judge whether the exportable peak power of input solar panel is greater than the no-load power consumption of inverter more accurately, and start is in time generated electricity by way of merging two or more grid systems according to test result, to realize making full use of cell panel output sun power.
In the inverter with DC/DC, the weak point of this scheme is that hardware cost is high.For example: the about 100W(of open circuit loss of the SC20KTL type photovoltaic DC-to-AC converter of Shanghai Zheng Tai power-supply system production that company limited researches and develops account for general power 0.5%), the power resistor R1 of selection at least needs 100W.
Summary of the invention
What the present invention will solve is the problems referred to above that prior art exists, and aims to provide a kind of compressor start up condition detection method with the photovoltaic DC-to-AC converter of DC/DC that is applicable to of novelty, can accurately judge the output power of cell panel, and without increasing hardware cost.
For addressing the above problem, the present invention by the following technical solutions: a kind of compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC, is characterized in that carrying out according to the following steps:
1) DSP control module sampling solar panel PV voltage, when solar panel PV voltage reaches default start threshold voltage Vmin, is designated as t1 constantly; From t1, arrive t2 constantly through time period of a setting constantly, if the voltage of solar panel PV detected in this process, continue to be greater than start threshold voltage Vmin, DSP control module is by the sample circuit BUS voltage of sampling, and to record this BUS voltage be V1, DSP control module is controlled DC/DC circuit and is started working simultaneously;
2) DSP control module by solar panel PV Control of Voltage near start threshold voltage Vmin, and within the time period of a setting, keep stablizing to t3 constantly; Near solar panel PV voltage can not maintain start threshold voltage Vmin, but continue to fall, illustrate that solar panel PV can not provide enough power, inverter enters holding state;
3) at ta, constantly recording BUS voltage is V2; In section detection time of waiting for a setting, arrive afterwards t4 constantly, the BUS voltage that records this moment is V3;
4) with formula (2), calculate the output power P of solar panel PV,
P = ΔW t 4 - ta = 1 2 C 2 ( V 3 2 - V 2 2 ) t 4 - ta - - - ( 2 )
In formula, C 2for BUS electric capacity;
5), when P is greater than the open circuit loss of inverter, start inverter work;
Wherein, described solar panel PV voltage refers to the output voltage of solar panel, and described BUS voltage refers to the bus voltage of inverter output.
The compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC of the present invention, utilize DC/DC circuit from solar panel PV extracting energy and store into BUS capacitor C 2, according to the change calculations of BUS capacitance energy storage in the unit interval, obtain the output power of solar panel PV, the precision of voltage sample is higher, simultaneously for specific inverter, its no-load power consumption can be tested and obtain in advance, therefore pass through this programme, can judge whether the exportable peak power of solar panel is greater than the no-load power consumption of inverter more accurately, and start is in time generated electricity by way of merging two or more grid systems according to test result, to realize making full use of cell panel output sun power, and without increasing hardware cost.
As a further improvement on the present invention, from t2 is during the moment, DSP control module is to be greater than the sampling rate sampling BUS voltage of 1K, and with the upper limit threshold values comparison of setting, when BUS voltage is greater than this upper limit threshold values, DC/DC circuit quits work, and solar panel PV power detection completes, inversion start operation.BUS voltage is monitored in real time, can be prevented the BUS electric capacity overvoltage causing when power input is larger.
As of the present invention, further improve, the time period of t3-t2 is set in and is less than 100ms, and section detection time of t4-ta is set in and is less than 500ms.
Accompanying drawing explanation
Fig. 1 is the output characteristic curve figure under different light intensity of solar panel.
Fig. 2 is that prior art increases start testing circuit photovoltaic DC-to-AC converter principle schematic.
Fig. 3 is solar inverter functional schematic of the present invention.
Fig. 4 is the present invention's testing process schematic diagram of starting shooting.
Embodiment
With reference to Fig. 3 and Fig. 4, a kind of compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC of the present invention, is characterized in that carrying out according to the following steps:
1) DSP control module sampling solar panel PV voltage, when solar panel PV voltage reaches default start threshold voltage Vmin, is designated as t1 constantly; From t1, arrive t2 constantly through time period of a setting constantly, if the voltage of solar panel PV detected in this process, continue to be greater than start threshold voltage Vmin, DSP control module is by the sample circuit BUS voltage of sampling, and to record this BUS voltage be V 1, the DC/DC of DSP control module control simultaneously circuit is started working;
2) DSP control module by solar panel PV Control of Voltage near start threshold voltage Vmin, and within the time period of a setting, keep stablizing to t3 constantly; Near solar panel PV voltage can not maintain start threshold voltage Vmin, but continue to fall, illustrate that solar panel PV can not provide enough power, inverter enters holding state;
3) at ta, constantly recording BUS voltage is V 2; In section detection time of waiting for a setting, arrive afterwards t4 constantly, the BUS voltage that records this moment is V 3;
4) use capacitance energy storage formula:
Figure GDA00002609138700041
calculate BUS electric capacity at ta to the energy storage between t4,
ΔW = 1 2 C 2 ( V 3 2 - V 2 2 ) - - - ( 1 )
By the relational expression W=Pt of power and energy,
P = ΔW t 4 - ta = 1 2 C 2 ( V 3 2 - V 2 2 ) t 4 - ta - - - ( 2 )
In formula, C 2for BUS electric capacity;
By formula (2), calculate the output power P of solar panel PV,
5), when P is greater than the open circuit loss of inverter, start inverter work.
From t2 is constantly time, DSP control module to be to be greater than the sampling rate sampling BUS voltage of 1K, and with the upper limit threshold values comparison of setting, when BUS voltage is greater than this upper limit threshold values, DC/DC circuit quits work, and solar panel PV power detection completes, inversion start operation.BUS voltage is monitored in real time, can be prevented the BUS electric capacity overvoltage causing when power input is larger.
The time period of t3-t2 is set in and is less than 100ms, and section detection time of t4-ta is set in and is less than 500ms.
Should be understood that: above-described embodiment is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed within the scope of connotation of the present invention, within all falling into protection scope of the present invention.

Claims (4)

1. be applicable to the compressor start up condition detection method with the photovoltaic DC-to-AC converter of DC/DC, it is characterized in that carrying out according to the following steps:
1) DSP control module sampling solar panel PV voltage, when solar panel PV voltage reaches default start threshold voltage Vmin, is designated as t1 constantly; From t1, arrive t2 constantly through time period of a setting constantly, if the voltage of solar panel PV detected in this process, continue to be greater than start threshold voltage Vmin, DSP control module is by the sample circuit BUS voltage of sampling, and to record this BUS voltage be V 1, the DC/DC of DSP control module control simultaneously circuit is started working;
2) DSP control module by solar panel PV Control of Voltage at start threshold voltage Vmin, and within the time period of a setting, keep stablizing to t3 constantly; When solar panel PV voltage can not maintain start threshold voltage Vmin, but continue to fall, illustrate that solar panel PV can not provide enough power, inverter enters holding state;
3) at ta, constantly recording BUS voltage is V 2; In section detection time of waiting for a setting, arrive afterwards t4 constantly, the BUS voltage that records this moment is V 3;
4) with formula (2), calculate the output power P of solar panel PV,
P = ΔW t 4 - ta = 1 2 C 2 ( V 3 2 - V 2 2 ) t 4 - ta - - - ( 2 )
In formula, C 2for BUS electric capacity;
5), when P is greater than the open circuit loss of inverter, start inverter work
Wherein, described solar panel PV voltage refers to the output voltage of solar panel, and described BUS voltage refers to the bus voltage of inverter output.
2. the compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC as claimed in claim 1, it is characterized in that from t2 is during the moment, DSP control module is to be greater than the sampling rate sampling BUS voltage of 1K, and with the upper limit threshold values comparison of setting, when BUS voltage is greater than this upper limit threshold values, DC/DC circuit quits work, and solar panel PV power detection completes, inversion start operation.
3. the compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC as claimed in claim 2, is characterized in that t3-t2 is less than 100ms.
4. the compressor start up condition detection method being applicable to the photovoltaic DC-to-AC converter of DC/DC as claimed in claim 2, is characterized in that t4-ta is less than 500ms.
CN201110104215.4A 2011-04-25 2011-04-25 Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current) Active CN102253278B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110104215.4A CN102253278B (en) 2011-04-25 2011-04-25 Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110104215.4A CN102253278B (en) 2011-04-25 2011-04-25 Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)

Publications (2)

Publication Number Publication Date
CN102253278A CN102253278A (en) 2011-11-23
CN102253278B true CN102253278B (en) 2014-01-15

Family

ID=44980650

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110104215.4A Active CN102253278B (en) 2011-04-25 2011-04-25 Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)

Country Status (1)

Country Link
CN (1) CN102253278B (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103187863B (en) * 2011-12-28 2016-04-20 深圳市汇川技术股份有限公司 The start-up control method of photovoltaic DC-to-AC converter and device
DE102012214177A1 (en) * 2012-08-09 2014-02-13 Robert Bosch Gmbh Power converter and method for setting and commissioning a power converter
CN103630737B (en) * 2012-08-29 2016-02-10 致茂电子(苏州)有限公司 There is the power meter and power measuring system of measuring duration function
CN105322868A (en) * 2014-08-01 2016-02-10 高平唐一新能源科技有限公司 Solar synergistic energy system and method
CN104333215B (en) * 2014-11-25 2018-07-03 阳光电源股份有限公司 A kind of method and device for inhibiting inverter frequent start-stop
CN105356511B (en) * 2015-12-04 2018-12-28 阳光电源股份有限公司 A kind of autocontrol method and device of photovoltaic generating system direct current side apparatus
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
CN106787866B (en) * 2016-12-15 2023-06-06 上海煦达新能源科技有限公司 Method for prolonging maximum power tracking running time of photovoltaic system
CN112217227B (en) * 2019-07-12 2022-09-13 阳光电源股份有限公司 Direct-current coupling photovoltaic off-grid hydrogen production system and control method thereof
CN112843491B (en) * 2021-02-08 2021-10-08 深圳天基权健康科技集团股份有限公司 Switching circuit, semiconductor laser treatment equipment and power supply switching control method
CN117096851B (en) * 2023-07-20 2024-06-25 上海正泰电源系统有限公司 Method, device and storage medium for predicting power of string photovoltaic array for inverter

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112007000197T5 (en) * 2006-01-27 2008-10-30 Sansha Electric Manufacturing Co., Ltd. Photovoltaic Inverters
KR100963521B1 (en) * 2008-03-10 2010-06-15 헥스파워시스템(주) Minimize Method for Stop and Operation of Photovoltaic Inverter
CN101860266B (en) * 2010-04-02 2013-04-24 艾默生网络能源有限公司 Photovoltaic inverter power saving control system and method
CN101950976B (en) * 2010-08-25 2012-11-28 常熟开关制造有限公司(原常熟开关厂) Grid-connected operation method of grid-connected type photovoltaic inverter
CN201789306U (en) * 2010-09-10 2011-04-06 上海正泰电源系统有限公司 Solar grid-connected inverter with starting point test function

Also Published As

Publication number Publication date
CN102253278A (en) 2011-11-23

Similar Documents

Publication Publication Date Title
CN102253278B (en) Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)
CN102545257B (en) Solar photovoltaic generating single-phase grid-connected inverter and control method thereof
CN101950976B (en) Grid-connected operation method of grid-connected type photovoltaic inverter
US9882385B2 (en) System for starting large-scale power load in micro-grid
US20090039826A1 (en) Solar energy charging/discharging system and charging/discharging method thereof
CN203690977U (en) Solar charging control system
CN103138291A (en) Wind power generation intelligent single-phase grid-connection controller
CN102722212A (en) Maximum power point tracking method for photovoltaic power generation system under non-uniform illumination
CN201789306U (en) Solar grid-connected inverter with starting point test function
CN105552952A (en) Photovoltaic-energy storage hybrid power generation system and energy management method therefor
CN205051931U (en) LED driving power supply
CN104600831A (en) Inverter auxiliary power supply system and method
CN203859575U (en) Reverse control integrated machine of hybrid power photovoltaic energy-storage system
CN204304465U (en) There is the photovoltaic grid-connected inversion control system that multimode group detects sampling functions
CN204597597U (en) A kind of domestic solar electric power system
CN203481909U (en) Sunshine power generation apparatus
CN106849177B (en) A kind of buck-boost grid-connected inverter
CN201846230U (en) High-power capacitance type charging circuit using wind power converter for energy storage
CN204258620U (en) Photovoltaic DC-to-AC converter starts control device
CN201934298U (en) Intelligent control and energy storage starting solar water pump device
CN203522297U (en) Initial charging device of energy storage system cell
CN104753154A (en) Initial charging device and method of energy storage system battery
CN203103982U (en) Maximum power tracking control system of two-stage grid-connected photovoltaic inverter
CN201639517U (en) Photovoltaic MPPT (Maximum Power Point Tracking) control circuit
CN102263502A (en) High-power wind power converter energy storage capacitor charging circuit

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right

Effective date of registration: 20180306

Address after: 201600 Shanghai city Songjiang District Sixian Road No. 3255 Building No. 4, block B

Co-patentee after: ZHEJIANG ASTRONERGY NEW ENERGY DEVELOPMENT Co.,Ltd.

Patentee after: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

Address before: 201614 Building No. 855, Wen he Lu, Songjiang District, Shanghai

Patentee before: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

TR01 Transfer of patent right
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20200415

Address after: 201620 building 4, No. 3255, Sixian Road, Songjiang District, Shanghai

Co-patentee after: ZHEJIANG ASTRONERGY NEW ENERGY DEVELOPMENT Co.,Ltd.

Patentee after: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

Co-patentee after: Zhejiang Zhengtai Power System Co.,Ltd.

Address before: 201600 Shanghai city Songjiang District Sixian Road No. 3255 Building No. 4, block B

Co-patentee before: ZHEJIANG ASTRONERGY NEW ENERGY DEVELOPMENT Co.,Ltd.

Patentee before: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20230327

Address after: 201620 building 4, 3255 Sixian Road, Songjiang District, Shanghai

Patentee after: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

Patentee after: Zhejiang Zhengtai Power System Co.,Ltd.

Address before: 201620 building 4, 3255 Sixian Road, Songjiang District, Shanghai

Patentee before: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

Patentee before: ZHEJIANG ASTRONERGY NEW ENERGY DEVELOPMENT Co.,Ltd.

Patentee before: Zhejiang Zhengtai Power System Co.,Ltd.

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20240201

Address after: 201600 block B, building 4, 3255 Sixian Road, Songjiang District, Shanghai

Patentee after: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

Country or region after: China

Address before: 201620 building 4, 3255 Sixian Road, Songjiang District, Shanghai

Patentee before: SHANGHAI CHINT POWER SYSTEMS Co.,Ltd.

Country or region before: China

Patentee before: Zhejiang Zhengtai Power System Co.,Ltd.