CN102253278A - 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

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CN102253278A
CN102253278A CN2011101042154A CN201110104215A CN102253278A CN 102253278 A CN102253278 A CN 102253278A CN 2011101042154 A CN2011101042154 A CN 2011101042154A CN 201110104215 A CN201110104215 A CN 201110104215A CN 102253278 A CN102253278 A CN 102253278A
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voltage
solar panel
inverter
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detection method
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CN102253278B (en
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谭钧承
徐锡军
张彦虎
朱军卫
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Shanghai Chint Power Systems Co ltd
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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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 start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band DC/DC
Technical field
The present invention relates to photovoltaic combining inverter or other input sources is the energy storage conversion equipment field of solar panel, specifically a kind of start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band DC/DC.
Background technology
The function of photovoltaic combining inverter is that the DC current that solar panel sends is converted into and the alternating electromotive force of public electric wire net with the frequency homophase, is fed in the electrical network.
As shown in Figure 1, be the output characteristic curve of solar panel under different illumination intensity.Because the intensity of illumination of the sun increases gradually from night to daytime, the peak power that solar panel can be exported has a process that increases gradually.And along with the open circuit voltage variations of the variation solar panel of intensity of illumination is little.Only judge according to the open-circuit voltage of solar panel when inverter start operation is irrational, because inverter is once will there be a bigger loss in the start operation.If the peak power that this loss can provide greater than solar panel, that inverter will consume the energy of electrical network, does not reach the purpose of generating electricity by way of merging two or more grid systems.This moment, inverter detected output power less than zero, and inverter is with 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 there is another problem in the inverter start is exactly to have started evening, can not make full use of the output energy of cell panel, but the loss generated output.
Therefore, how accurately judging the output power ability of cell panel, in time start the inverter work of being incorporated into the power networks according to its output power ability, to make full use of solar electrical energy generation, is the problem that inverter need solve.Existing start method of testing increases an auxiliary switch Q2 and a test resistance R1 as shown in Figure 2 on original inverter, to realize the exportable power test function of input cell panel.Resistance R 1 one ends link to each other with the positive pole of input solar panel, and the other end links to each other with the collector of auxiliary switch Q1, and the emitter of auxiliary switch links to each other 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 reached default start thresholding, the control auxiliary switch was open-minded in short-term, and resistance R 1 will be added in as load and import on the cell panel like this, judge cell panel output power ability by the cell plate voltage after the stable testing.If stable back inverter input voltage still is higher than minimum operating voltage, then show the no-load power consumption of the output power of cell panel greater than inverter, show then that inverter can be started shooting to generate electricity by way of merging two or more grid systems that the control auxiliary switch disconnects, and starts inverter work; Otherwise, if this moment, the inverter input voltage was lower than minimum operating voltage, show that then the maximum exportable power of importing solar panel is lower than the open circuit loss of inverter, inverter should not be started shooting, then continue test (perhaps for avoiding resistance to power up for a long time causing overheated, can consider that auxiliary switch temporarily disconnects, commissioning again after the time-delay), until satisfying the start condition.
In this scheme, the precision of voltage sample is higher, resistance is predeterminable, simultaneously for specific inverter, therefore its no-load power consumption can be tested in advance and obtain, and by the test circuit of this scheme, whether the exportable peak power that can judge the input solar panel greater than the no-load power consumption of inverter more accurately, and according to test result start is in time generated electricity by way of merging two or more grid systems, to realize making full use of to cell panel output sun power.
In having the inverter of DC/DC, the weak point of this scheme is the hardware cost height.For example: the about 100W of open circuit loss of the SC20KTL type photovoltaic DC-to-AC converter of the positive safe power-supply system production that company limited researches and develops in Shanghai (account for general power 0.5%), the power resistor R1 of selection needs 100W at least.
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 start condition detection method of the photovoltaic DC-to-AC converter that is applicable to band DC/DC of novelty, can accurately judge the output power of cell panel, and need not to increase hardware cost.
For addressing the above problem, the present invention by the following technical solutions: a kind of start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band 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; Arrive t2 constantly through the time period of a setting constantly from t1, if detecting the voltage of solar panel PV in this process continues greater than start threshold voltage Vmin, then the DSP control module is by sample circuit sampling BUS voltage, and to write down this BUS voltage be V1, and the DC/DC of DSP control module control simultaneously circuit is started working;
2) the DSP control module with solar panel PV Control of Voltage near start threshold voltage Vmin, and in the time period of a setting, keep stable to t3 constantly; Near solar panel PV voltage can not maintain start threshold voltage Vmin, but continue to fall, illustrate that then solar panel PV can not provide enough power, inverter enters holding state;
3) writing down BUS voltage constantly at ta is V2; Arrive t4 constantly in the detection time of waiting for a setting after the section, the BUS voltage that writes down this moment is V3;
4) usefulness formula (2) calculates 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 the formula, C2 is a BUS electric capacity;
5) as P during, start inverter work greater than the open circuit loss of inverter.
The start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band DC/DC of the present invention, utilize the DC/DC circuit from solar panel PV extracting energy and store on the BUS capacitor C 2, obtain the output power of solar panel PV according to the change calculations of BUS capacitance energy storage in the unit interval, the precision of voltage sample is higher, simultaneously for specific inverter, its no-load power consumption can be tested in advance and obtain, therefore pass through this programme, whether the exportable peak power that can judge solar panel greater than the no-load power consumption of inverter more accurately, and according to test result start is in time generated electricity by way of merging two or more grid systems, with realization cell panel is exported making full use of of sun power, and need not to increase hardware cost.
As a further improvement on the present invention, from t2 constantly the time, the DSP control module is with the sampling rate sampling BUS voltage greater than 1K, and with the upper limit threshold values of setting relatively, when BUS voltage during greater than this upper limit threshold values, the DC/DC circuit quits work, and solar panel PV power detection is finished, inversion start operation.BUS voltage is monitored in real time, can be prevented the BUS electric capacity overvoltage that power input causes when big.
Further improve as of the present invention, the time period of t3-t2 is set in less than 100ms, and section detection time of t4-ta is set in less than 500ms.
Description of drawings
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 a solar inverter functional schematic of the present invention.
Fig. 4 is the present invention's testing process synoptic diagram of starting shooting.
Embodiment
With reference to Fig. 3 and Fig. 4, a kind of start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band 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; Arrive t2 constantly through the time period of a setting constantly from t1, if detecting the voltage of solar panel PV in this process continues greater than start threshold voltage Vmin, then the DSP control module is by sample circuit sampling BUS voltage, and to write down this BUS voltage be V1, and the DC/DC of DSP control module control simultaneously circuit is started working;
2) the DSP control module with solar panel PV Control of Voltage near start threshold voltage Vmin, and in the time period of a setting, keep stable to t3 constantly; Near solar panel PV voltage can not maintain start threshold voltage Vmin, but continue to fall, illustrate that then solar panel PV can not provide enough power, inverter enters holding state;
3) writing down BUS voltage constantly at ta is V2; Arrive t4 constantly in the detection time of waiting for a setting after the section, the BUS voltage that writes down this moment is V3;
4) utilization capacitance energy storage formula:
Figure BDA0000057263210000041
Calculate BUS electric capacity at ta to the energy storage between the 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 the formula, C 2Be BUS electric capacity;
Calculate the output power P of solar panel PV by formula (2),
5) as P during, start inverter work greater than the open circuit loss of inverter.
From t2 constantly the time, the DSP control module is with the sampling rate sampling BUS voltage greater than 1K, and with the upper limit threshold values of setting relatively, when BUS voltage during greater than this upper limit threshold values, the DC/DC circuit quits work, and solar panel PV power detection is finished, inversion start operation.BUS voltage is monitored in real time, can be prevented the BUS electric capacity overvoltage that power input causes when big.
The time period of t3-t2 is set in less than 100ms, and section detection time of t4-ta is set in less than 500ms.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.

Claims (4)

1. start condition detection method of photovoltaic DC-to-AC converter that is applicable to band 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; Arrive t2 constantly through the time period of a setting constantly from t1, if detecting the voltage of solar panel PV in this process continues greater than start threshold voltage Vmin, then the DSP control module is by sample circuit sampling BUS voltage, and to write down this BUS voltage be V1, and the DC/DC of DSP control module control simultaneously circuit is started working;
2) the DSP control module with solar panel PV Control of Voltage near start threshold voltage Vmin, and in the time period of a setting, keep stable to t3 constantly; Near solar panel PV voltage can not maintain start threshold voltage Vmin, but continue to fall, illustrate that then solar panel PV can not provide enough power, inverter enters holding state;
3) writing down BUS voltage constantly at ta is V2; Arrive t4 constantly in the detection time of waiting for a setting after the section, the BUS voltage that writes down this moment is V3;
4) usefulness formula (2) calculates 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 the formula, C 2Be BUS electric capacity;
5) as P during, start inverter work greater than the open circuit loss of inverter.
2. the start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band DC/DC as claimed in claim 1, it is characterized in that from t2 during the moment, the DSP control module is with the sampling rate sampling BUS voltage greater than 1K, and with the upper limit threshold values of setting relatively, when BUS voltage during greater than this upper limit threshold values, the DC/DC circuit quits work, and solar panel PV power detection is finished, inversion start operation.
3. the start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band DC/DC as claimed in claim 2 is characterized in that t3-t2 is less than 100ms.
4. the start condition detection method that is applicable to the photovoltaic DC-to-AC converter of band DC/DC as claimed in claim 2 is characterized in that t4-ta is less than 500ms.
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Cited By (11)

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CN103187863A (en) * 2011-12-28 2013-07-03 深圳市汇川技术股份有限公司 Startup control method and device for photovoltaic inverter
CN103630737A (en) * 2012-08-29 2014-03-12 致茂电子(苏州)有限公司 Power meter and power measurement system with function of measuring duration time
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
CN104508963A (en) * 2012-08-09 2015-04-08 罗伯特·博世有限公司 Current converter and method for setting the operation of a current converter and putting a current converter into operation
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
CN105356511A (en) * 2015-12-04 2016-02-24 阳光电源股份有限公司 Automatic control method and apparatus of photovoltaic power generation system DC side device
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
CN106787866A (en) * 2016-12-15 2017-05-31 上海煦达新能源科技有限公司 The method that photovoltaic system extends maximum power tracing run time
CN112217227A (en) * 2019-07-12 2021-01-12 阳光电源股份有限公司 Direct-current coupling photovoltaic off-grid hydrogen production system and control method thereof
CN112843491A (en) * 2021-02-08 2021-05-28 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
CN117096851A (en) * 2023-07-20 2023-11-21 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

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CN101950976A (en) * 2010-08-25 2011-01-19 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

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KR100963521B1 (en) * 2008-03-10 2010-06-15 헥스파워시스템(주) Minimize Method for Stop and Operation of Photovoltaic Inverter
CN101860266A (en) * 2010-04-02 2010-10-13 艾默生网络能源有限公司 Photovoltaic inverter power saving control system and method
CN101950976A (en) * 2010-08-25 2011-01-19 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
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Cited By (19)

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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
CN103187863A (en) * 2011-12-28 2013-07-03 深圳市汇川技术股份有限公司 Startup control method and device for photovoltaic inverter
CN104508963A (en) * 2012-08-09 2015-04-08 罗伯特·博世有限公司 Current converter and method for setting the operation of a current converter and putting a current converter into operation
CN103630737A (en) * 2012-08-29 2014-03-12 致茂电子(苏州)有限公司 Power meter and power measurement system with function of measuring duration time
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
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
CN105356511A (en) * 2015-12-04 2016-02-24 阳光电源股份有限公司 Automatic control method and apparatus of photovoltaic power generation system DC side device
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
CN106787866A (en) * 2016-12-15 2017-05-31 上海煦达新能源科技有限公司 The method that photovoltaic system extends maximum power tracing run time
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
CN112217227A (en) * 2019-07-12 2021-01-12 阳光电源股份有限公司 Direct-current coupling photovoltaic off-grid hydrogen production system and control method thereof
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
CN112843491A (en) * 2021-02-08 2021-05-28 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
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
CN117096851A (en) * 2023-07-20 2023-11-21 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
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

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