CN101752877A - Photovoltaic synchronization inverter with photovoltaic array IV test function and test method - Google Patents
Photovoltaic synchronization inverter with photovoltaic array IV test function and test method Download PDFInfo
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- CN101752877A CN101752877A CN201010046547A CN201010046547A CN101752877A CN 101752877 A CN101752877 A CN 101752877A CN 201010046547 A CN201010046547 A CN 201010046547A CN 201010046547 A CN201010046547 A CN 201010046547A CN 101752877 A CN101752877 A CN 101752877A
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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
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- 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 photovoltaic synchronization inverter with a photovoltaic array IV test function, which is composed of an inverter main circuit and a system controller; the inverter main circuit adopts an adjustable-voltage inverter and comprises a one-phase and three-phase synchronization system; the photovoltaic synchronization inverter is characterized in that: a current sensor CT1 for measuring photovoltaic array input current is arranged between a photovoltaic array input port and a filter capacitor C1; a direct-current bus bar voltage sensor VT1 for measuring the voltage of the filter capacitor C1 end is arranged; a direct-current breaker K1 is arranged at the photovoltaic array output port, the photovoltaic array output general current is input to the photovoltaic synchronization inverter, the direct-current bus bar voltage sensor VT1 and the current sensor CT1 through the direct-current breaker K1; the photovoltaic synchronization inverter is suitable for the conventional synchronization inverting system, can test the photovoltaic array IV characteristics of the system conveniently, and the test data is used for analyzing and evaluating the photovoltaic array characteristics of the system and the power generating capacity.
Description
Technical field
The present invention relates to tens of kilowatts to other high-power photovoltaic synchronization contravariant device of MW level, a kind of photovoltaic combining inverter and method of testing of more specifically saying so with photovoltaic array IV test function.
Background technology
Along with developing rapidly of solar photovoltaic grid-connection generating; the solar photovoltaic grid-connection generating of scale is a development in future trend; large-scale or oversized pv grid-connected plant will get more and more; photovoltaic array is the important component part of photovoltaic generating system; it has determined the energy output of photovoltaic system, also accounts for the major part of photovoltaic system cost simultaneously.The energy output of photovoltaic array is the summation of forming all monolithic solar module energy output of array in theory, but the energy output of photovoltaic array often is significantly less than the Design Theory requirement in practice, and this is owing to the suffered restriction factor of solar power generation is quite a lot of.With regard to its inside reason, comprise the connection combined efficiency loss that monoblock battery self-characteristic difference causes, monoblock battery is damaged, cell degradation or the like, and the external environment factor then comprises the clean level, rule of combination of installation, the cell panel of the battery of array etc.Be exactly for same photovoltaic array, the variation of external conditions such as ambient temperature, intensity of sunshine, wind speed, running time also all can cause the variation of the energy output, system effectiveness etc. of photovoltaic system.These a series of uncertain influencing factors can cause the rational photovoltaic system of Design Theory, and energy output and designing requirement error are bigger when actual motion.Thereby all can only in concrete practice, determine real energy output and system effectiveness according to the actual environment condition of installing for any photovoltaic system.The on-the-spot test result of photovoltaic array analyzes and estimates one of important evidence of photovoltaic array generating efficiency.
For the on-the-spot test of high-power photovoltaic plant photovoltaic array, need special-purpose testing equipment, the scene also is inconvenient to operate, and existing testing equipment difficult parameters is to satisfy the demand in various power stations.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of photovoltaic combining inverter and method of testing with photovoltaic array IV test function is provided, in the inner test that realizes input side photovoltaic array IV characteristic of combining inverter, for the IV characteristic test that realizes on-the-spot photovoltaic array provides solution, and can be used to estimate photovoltaic array IV, PV characteristic under imposing a condition, make things convenient for the generating capacity assessment of photovoltaic plant system, instruct the MPPT maximal power tracing mode of photovoltaic DC-to-AC converter, improve and follow the tracks of efficient.
Technical solution problem of the present invention adopts following technical scheme:
The present invention has the photovoltaic combining inverter of photovoltaic array IV test function, is made of converter main circuit and system controller, and described converter main circuit adopts voltage source inverter, comprises single-phase and the three-phase grid system, and its design feature is:
Between photovoltaic array input port and filter capacitor C1, be provided for the current sensor CT1 of measuring light photovoltaic array input current; Be provided for measuring the DC bus-bar voltage transducer VT1 of filter capacitor C1 terminal voltage;
Output port at described photovoltaic array is provided with dc circuit breaker K1, and the output total current of described photovoltaic array is through described dc circuit breaker K1 input photovoltaic combining inverter, DC bus-bar voltage transducer VT1 and current sensor CT1.
The design feature that the present invention has the photovoltaic combining inverter of photovoltaic array IV test function also is:
Electric current, voltage sample passage are set in described system controller and are used to preserve the RAM data memory of sampled I V data, and supporting display unit and the communication interface of being provided with; System controller is after carrying out Filtering Processing to described sampled I V data, and the access display shows and/or carries out transfer of data by communication interface.
The characteristics of the method for testing of photovoltaic combining inverter of the present invention are: being in 5% of photovoltaic array open circuit voltage with the terminal voltage of described filter capacitor C1 is the detecting state with in, real-time monitored is by described current sensor CT1 and the measured electric current of DC bus-bar voltage transducer VT1 under described detecting state, the variation of voltage, judge finish time of the charging process of the closing moment of described dc circuit breaker K1 and filter capacitor C1 according to the variation of described electric current and voltage, admission is the change curve to filter capacitor C1 charging process electric current and voltage in the stage of the finish time from closing moment of dc circuit breaker K1.
The characteristics of the method for testing of photovoltaic combining inverter of the present invention also can be: the direct voltage lower limit of setting when being incorporated into the power networks is Vd; When described inverter is incorporated into the power networks, in the scope of direct voltage lower limit Vd and photovoltaic array open circuit voltage, carry out the scanning of the sampled I V data of photovoltaic array according to user instruction, the be incorporated into the power networks sampled I V data relationship of the photovoltaic array under the state of acquisition, and with the PV curve of this photovoltaic array.
PV curve for photovoltaic array is the situation of multimodal, the track-while-scan scope that best maximum power point MPPT is set largest peaks ± 50V in.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention is applicable to conventional grid-connected inverting system, can conveniently test the IV characteristic of native system institute luminous intensity distribution photovoltaic array, and utilize test data to analyze characteristics and generating capacity with the evaluating system photovoltaic array.
2, the present invention can be used in reference to the MPPT tracking mode of leaded light volt combining inverter according to field measurement photovoltaic array PV peak feature, improves generating efficiency.
3, the present invention can be used for easily photovoltaic array being carried out useful life and faults analysis.
Description of drawings
Fig. 1 is the main circuit schematic diagram.
Fig. 2 photovoltaic array electric capacity charging transient process schematic diagram.
The IV of Fig. 3 photovoltaic array and PV schematic diagram.
Fig. 4 online IV characteristic scanning survey control block diagram that is incorporated into the power networks.
Below by embodiment, the invention will be further described in conjunction with the accompanying drawings.
Embodiment
In system of the present invention shown in Figure 1, port SP and SN are the input port of photovoltaic array PV, K1 is a dc circuit breaker, it is outside or inner to be positioned at system, manually or automatically all can, U, V, W is the three-phase output end mouth of inversion unit, CT1 is the dc bus current transducer of inversion unit, and C1 is a dc filter capacitor, and CT1 is between photovoltaic array PV and filter capacitor C1, can detect the output current of PV, VT1 is the direct voltage transducer, and CT1 and VT1 select the Hall element of high speed and precision, and T1～T6 is the power model IGBT in the inversion unit, for other parts in the main circuit, comprise that inductance and transformer are provided with routinely.
When photovoltaic array PV is tested, at first need shut down, and disconnect K1 and cut off being connected of inverter and electrical network, the voltage of waiting for main circuit filter capacitor C1 then progressively self discharge drops to suitable low-voltage.The power supply of control system must be normal, be that electrical network can be powered to controller, but do not power to main circuit, be positioned at suitable low-voltage at capacitance voltage, during such as 0 volt, the IV test program of start-up system, and closed K1 are at the K1 uncertainty of closing moment, this program detects the variation of direct voltage and electric current all the time, in case discovery electric current, voltage has sudden change, promptly thinks the K1 closure, carries out the sampling and the stored record of data immediately, stable until voltage and current (is that electric current is near 0 value, and voltage is almost constant) time, finish sampling and carry out the storage of sampled data, promptly think that PV finishes the charging transient process of electric capacity this moment.
After systematic sampling is finished, institute's deposit data is carried out the filtering smoothing processing, serial line interface by this machine send the lattice lcd screen to show, on display screen, can indicate maximum power point voltage and current value, and reference axis and unit (as voltage, electric current, power) in length and breadth, its intensity of sunshine and junction temperature adopt manually input.The dot lcd screen can adopt touch-screen, it not only has the monitoring management function of system's operation, also has processing capacity to the photovoltaic array data and curves, programming is convenient, flexible, by man-machine interface the junction temperature and the intensity of sunshine of current solar module are set, system can explicit user estimate IV and PV curve under interested intensity of sunshine and the junction temperature condition.The estimating function valuable reference data can be provided for the generating capacity of pv grid-connected plant of this photovoltaic array.
Fig. 2 is the electric current and voltage transient process schematic diagram of photovoltaic array when charging to electric capacity.
Fig. 3 (a) Fig. 3 (b) is respectively IV and the PV curve synoptic diagram that generates according to the electric current and voltage sampled data.
Above IV test process needs to shut down; and the discharge of wait filter capacitor C1; this is comparatively easily in maintenance and erection stage; generally can not influence generating; if but system has been in normal generating state; shut down test I V characteristic and then can influence generating production; also can cause bigger shock effect to electrical network; when generating electricity by way of merging two or more grid systems; online the IV characteristic is tested, can reduce influence, though can not test at the IV of full voltage range to photovoltaic array to grid generation; but can in operating voltage range, realize test, the blocking of PV curve multi-peak that discovery may exist or cell panel to the IV of photovoltaic array; fault and decay etc.
Fig. 4 is the online IV characteristic scanning survey control block diagram that is incorporated into the power networks, according to the photovoltaic array operating voltage range of system, when receiving IV sweep test instruction (M/S is chosen as at 1 o'clock), finish the MPPT trace routine, carry out SCPV scanning PV program, with the voltage instruction V of dc bus
Dc *By the given closed-loop control of step-by-step system, increase or reduce direct voltage V
Dc, the normal working voltage scope of its excursion covering system, in command voltage scan period, the direct voltage V of system
DcTrace command voltage V
Dc *Change, generate electricity by way of merging two or more grid systems and also continuing, but the power that is incorporated into the power networks can change along with the variation of direct voltage, system forms IV and PV relation curve to the sample storage and set up data relationship of the direct voltage of this scanning process and electric current.Because being incorporated into the power networks needs operate as normal, so the voltage of scanning has lower limit, the IV curve can lack related data at the lower limit of direct voltage, but this does not influence assessment and judgement to the photovoltaic array characteristic.
The present invention is under the constant situation of system's main circuit structure, utilize the dc circuit breaker of main circuit to close a floodgate moment, photovoltaic array is to the IV variation relation of the charging process of main circuit filter capacitor, high-speed sampling direct voltage and electric current, realize IV, power-voltage (PV) characteristic test of photovoltaic array, and can IV, the PV characteristic of this photovoltaic array be estimated and estimate according to test result.System is according to test result, best MPPT maximum power point tracking MPPT zone can be set, thereby accelerate the tracking velocity of MPPT and follow the tracks of efficient, effectively avoid because many groups string of solar cell and and shade block the influence of multi-peak that the PV that may bring concerns to MPPT.Being provided with of this function can be saved special-purpose photovoltaic array IV testing equipment, convenient on-the-spot debugging, the particularly Installation and Debugging of MW class pv grid-connected plant and assessment, existing photovoltaic array IV testing equipment is difficult to satisfy system requirements because adaptive power is less.
Claims (5)
1. the photovoltaic combining inverter that has photovoltaic array IV test function is made of converter main circuit and system controller, and described converter main circuit adopts voltage source inverter, comprises single-phase and the three-phase grid system, it is characterized in that:
Between photovoltaic array input port and filter capacitor C1, be provided for the current sensor CT1 of measuring light photovoltaic array input current; Be provided for measuring the DC bus-bar voltage transducer VT1 of filter capacitor C1 terminal voltage;
Output port at described photovoltaic array is provided with dc circuit breaker K1, and the output total current of described photovoltaic array is through described dc circuit breaker K1 input photovoltaic combining inverter, DC bus-bar voltage transducer VT1 and current sensor CT1.
2. the photovoltaic combining inverter with photovoltaic array IV test function according to claim 1, the RAM data memory that it is characterized in that electric current, voltage sample passage are set and be used to preserve sampled I V data in described system controller, and supporting display unit and the communication interface of being provided with; System controller is after carrying out Filtering Processing to described sampled I V data, and the access display shows and/or carries out transfer of data by communication interface.
3. the method for testing of the described photovoltaic combining inverter of claim 1, it is characterized in that it is the detecting state with in that terminal voltage with described filter capacitor C1 is in 5% of photovoltaic array open circuit voltage, real-time monitored is by described current sensor CT1 and the measured electric current of DC bus-bar voltage transducer VT1 under described detecting state, the variation of voltage, judge finish time of the charging process of the closing moment of described dc circuit breaker K1 and filter capacitor C1 according to the variation of described electric current and voltage, admission is the change curve to filter capacitor C1 charging process electric current and voltage in the stage of the finish time from closing moment of dc circuit breaker K1.
4. the method for testing of the described photovoltaic combining inverter of claim 1, the direct voltage lower limit that it is characterized in that setting when being incorporated into the power networks is Vd; When described inverter is incorporated into the power networks, in the scope of direct voltage lower limit Vd and photovoltaic array open circuit voltage, carry out the scanning of the sampled I V data of photovoltaic array according to user instruction, the be incorporated into the power networks sampled I V data relationship of the photovoltaic array under the state of acquisition, and with the PV curve of this photovoltaic array.
5. the method for testing of photovoltaic combining inverter according to claim 4 is characterized in that the PV curve for photovoltaic array is the situation of multimodal, the track-while-scan scope that best maximum power point MPPT is set largest peaks ± 50V in.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175944A (en) * | 2011-02-24 | 2011-09-07 | 复旦大学 | Photovoltaic grid-connected inverter test bench |
| AT510502A1 (en) * | 2010-09-30 | 2012-04-15 | Fronius Int Gmbh | INVERTER AND METHOD FOR SEPARATING PHOTOVOLTAIC MODULES FROM AN INVERTER |
| CN103048599A (en) * | 2012-11-13 | 2013-04-17 | 中国科学院电工研究所 | Characteristic test device for photovoltaic cell |
| CN103744013A (en) * | 2014-01-21 | 2014-04-23 | 上海新世纪机器人有限公司 | Full control bridge circuit fault diagnosis method |
| CN104020373A (en) * | 2014-05-29 | 2014-09-03 | 中铝宁夏能源集团有限公司 | Photovoltaic inverter outdoor test system |
| CN105899963A (en) * | 2013-11-14 | 2016-08-24 | 艾思玛太阳能技术股份公司 | Method and inverter for determining capacitance values of capacitances of an energy supply system |
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| CN108054998A (en) * | 2017-12-26 | 2018-05-18 | 深圳古瑞瓦特新能源股份有限公司 | A kind of optimizer, photovoltaic generating system and photovoltaic generation control method |
| CN108540085A (en) * | 2012-06-04 | 2018-09-14 | 太阳能安吉科技有限公司 | Integrated photovoltaic panel circuit |
| CN112217475A (en) * | 2020-09-29 | 2021-01-12 | 合肥阳光新能源科技有限公司 | IV curve scanning method and optical storage system |
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| CN100412542C (en) * | 2005-10-01 | 2008-08-20 | 中国科学院等离子体物理研究所 | Method for real-timely testing performance of multi-channel photovoltaic cell |
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2010
- 2010-01-15 CN CN2010100465477A patent/CN101752877B/en not_active Expired - Fee Related
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| AT510502A1 (en) * | 2010-09-30 | 2012-04-15 | Fronius Int Gmbh | INVERTER AND METHOD FOR SEPARATING PHOTOVOLTAIC MODULES FROM AN INVERTER |
| AT510502B1 (en) * | 2010-09-30 | 2015-08-15 | Fronius Int Gmbh | INVERTER AND METHOD FOR SEPARATING PHOTOVOLTAIC MODULES FROM AN INVERTER |
| CN102175944A (en) * | 2011-02-24 | 2011-09-07 | 复旦大学 | Photovoltaic grid-connected inverter test bench |
| CN108540085A (en) * | 2012-06-04 | 2018-09-14 | 太阳能安吉科技有限公司 | Integrated photovoltaic panel circuit |
| US11606061B2 (en) | 2012-06-04 | 2023-03-14 | Solaredge Technologies Ltd. | Integrated photovoltaic panel circuitry |
| US11177768B2 (en) | 2012-06-04 | 2021-11-16 | Solaredge Technologies Ltd. | Integrated photovoltaic panel circuitry |
| CN103048599A (en) * | 2012-11-13 | 2013-04-17 | 中国科学院电工研究所 | Characteristic test device for photovoltaic cell |
| CN105899963A (en) * | 2013-11-14 | 2016-08-24 | 艾思玛太阳能技术股份公司 | Method and inverter for determining capacitance values of capacitances of an energy supply system |
| CN105899963B (en) * | 2013-11-14 | 2018-10-09 | 艾思玛太阳能技术股份公司 | The method and inverter of the capacitance of capacitance for determining power supply unit |
| CN103744013A (en) * | 2014-01-21 | 2014-04-23 | 上海新世纪机器人有限公司 | Full control bridge circuit fault diagnosis method |
| CN103744013B (en) * | 2014-01-21 | 2016-06-22 | 上海新世纪机器人有限公司 | Full-controlled bridge circuit failure diagnosis method |
| CN104020373A (en) * | 2014-05-29 | 2014-09-03 | 中铝宁夏能源集团有限公司 | Photovoltaic inverter outdoor test system |
| CN106533359A (en) * | 2016-09-21 | 2017-03-22 | 中国电子科技集团公司第四十研究所 | Photovoltaic assembly outdoor testing device and method of programmable compensation design |
| CN106597151B (en) * | 2016-12-02 | 2021-01-15 | 中国电力科学研究院有限公司 | Photovoltaic power station switched inverter tracking efficiency testing method and system |
| CN106597151A (en) * | 2016-12-02 | 2017-04-26 | 中国电力科学研究院 | Method and system for testing photovoltaic plant already-operating inverter tracking efficiency |
| CN108054998A (en) * | 2017-12-26 | 2018-05-18 | 深圳古瑞瓦特新能源股份有限公司 | A kind of optimizer, photovoltaic generating system and photovoltaic generation control method |
| CN112217475A (en) * | 2020-09-29 | 2021-01-12 | 合肥阳光新能源科技有限公司 | IV curve scanning method and optical storage system |
| CN112217475B (en) * | 2020-09-29 | 2022-07-15 | 阳光新能源开发股份有限公司 | IV curve scanning method and optical storage system |
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