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 PDFInfo
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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
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,
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:
calculate BUS electric capacity at ta to the energy storage between t4,
By the relational expression W=Pt of power and energy,
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,
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.
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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 |
| 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 |
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| KR100963521B1 (en) * | 2008-03-10 | 2010-06-15 | 헥스파워시스템(주) | Minimize Method for Stop and Operation of Photovoltaic Inverter |
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