CN104316763A - System and method for detecting current harmonics of photovoltaic inverter - Google Patents
System and method for detecting current harmonics of photovoltaic inverter Download PDFInfo
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- CN104316763A CN104316763A CN201410657242.8A CN201410657242A CN104316763A CN 104316763 A CN104316763 A CN 104316763A CN 201410657242 A CN201410657242 A CN 201410657242A CN 104316763 A CN104316763 A CN 104316763A
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Abstract
The invention provides a system and method for detecting current harmonics of a photovoltaic inverter. The system and method are characterized in that the system is provided with a PC, a power analyzer, the detected photovoltaic inverter and a data converter; the power analyzer uploads acquired current harmonic data in the detected photovoltaic inverter to the PC, the current harmonic data are stored through a current harmonic detected data capture function module and a calculation function module which are embedded into the PC and guided in an Excel form to be processed, and finally a report form is generated and printed. The method is easy and convenient to implement, detection reliability is improved, and detection time is shortened.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter detection field, in particular, provide a kind of photovoltaic DC-to-AC converter current harmonic detection system and method.
Background technology
Current domestic photovoltaic DC-to-AC converter, when doing authentication test, needs to do current harmonics test.According to correlation standard, need to detect output current less than 40 times (containing 40 times) current harmonics value when inverter is operated in rated power 30%, 50%, 70%, 100%.Most method of testing reads 30% rated power current harmonics value (40 data) for tester's operating power analyser, is manually stored on PC; After the same method the current harmonics value of 50%, 70%, 100% rated power is stored on PC.Then on PC, manual unlocking 4 groups of test datas comparatively draw final testing result by manpower comparing.Because test once will artificial treatment 160 data, so the method for testing that repetitive measurement is averaged cannot be taked.Being necessary to study a kind of photovoltaic DC-to-AC converter current harmonics detection method can harmonic data automatically in readout power analyser processing, so that repeated detection is averaged obtain final harmonic data.
Summary of the invention
The object of the invention is to solve above-mentioned the deficiencies in the prior art, provide a kind of method simple and convenient, improve detection perform, data are reliably accurate, shorten photovoltaic DC-to-AC converter current harmonic detection system and the method for detection time.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of photovoltaic DC-to-AC converter current harmonic detection system, it is characterized in that being provided with PC, power analyzer, tested photovoltaic DC-to-AC converter and data converter, described power analyzer is connected with tested photovoltaic DC-to-AC converter through data line, be connected with PC through data converter, described PC is embedded with current harmonics and detects data capture functional module and computing function module
Wherein, described current harmonics detects data capture functional module and realizes primarily of Windows API related function, its Windows API related function comprises ShellExecute function, FindWindow function, FindWindowEx function, GetDlgCtrlID function and SendMessage function
ShellExecute function is utilized to open Norma View software in power analyzer;
FindWindow function is utilized to obtain the handle of the Norma View window in power analyzer;
According to Norma View window handle, and FindWindowEx and GetDlgCtrlID function is utilized to obtain the handle ID of " run/suspend " and " preservation data " two knobs;
Utilize SendMessage function to send mouse information, realize the function that these two knobs are clicked in simulation;
Utilize SendMessage function to send press key message, realize analog input and preserve filename and shortcut " preservation " function;
Described computing function module carries ExcelApplication primarily of programming software, ExcelWorkbook and ExcelWorksheet control realizes,
ExcelApplication1.Connect function is utilized to open Excel table;
ExcelWorkbook1.ConnectTo function is utilized to add new workbook;
ExcelApplication1.Workbooks.Open function is utilized to open the harmonic data file of preservation;
Utilize ExcelApplication1.Cells [] .Value assignment function that data are pressed row again, facilitate mean value calculation;
ExcelApplication1.Cells [] .Value is utilized to do mean value calculation to 20 repeated sampling data;
And utilize the current harmonics numerical value in ExcelApplication1.SaveAs function preservation Excel table.
A kind of photovoltaic DC-to-AC converter current harmonics detection method, its step is specially:
1) power analyzer gathers the load rating power of tested photovoltaic DC-to-AC converter, the Norma View software collection current harmonics numerical value be embedded in by power analyzer;
2) PC is connected the Norma View software window of power analyzer by data converter and current harmonics detection data capture functional module, and catch the current harmonics button and preservation data button that read in Norma View software in power analyzer, simulation is clicked and is read harmonic wave button and preserve data button, current harmonics data file is preserved; Find harmonic data file according to storing path and filename and open;
3) in PC, create Excel table, and detects data capture functional module with current harmonics and be connected, current harmonics data file is imported to during Excel shows;
4) repeat aforesaid operations to N time, then Tentative Study of Achievement of Manipulation on Excel table is averaged and ratio to the data that N time gathers, and obtains final current harmonics data;
5) finally the current harmonics data in Excel table are preserved and printed;
Power analyzer of the present invention is Fluke Norma5000.
Data converter of the present invention adopts RS232 data converter, also can adopt Ethernet connected mode.
The invention has the beneficial effects as follows:
1. the present invention completes the detection of photovoltaic DC-to-AC converter current harmonics, and method is simple and convenient, shortens detection time, facts have proved that the test of original a couple of days only needs one or two hour by the invention process.
2. what this method finally exported is Excel table, facilitates subsequent treatment and the printing of data.
3. this method adopts multi-group data to average method process current harmonics data, ensures the accuracy of result.
accompanying drawing explanation
Fig. 1 is structural drawing of the present invention.
Fig. 2 is detection method process flow diagram of the present invention.
Embodiment
As shown in Figure 1, a kind of photovoltaic DC-to-AC converter current harmonic detection system, it is characterized in that being provided with PC 1, power analyzer 2, tested photovoltaic DC-to-AC converter 3 and data converter 4, described power analyzer 2 is connected with tested photovoltaic DC-to-AC converter 3 through data line, be connected with PC 1 through data converter 4, described PC 1 is embedded with current harmonics and detects data capture functional module and computing function module
Wherein, described current harmonics detects data capture functional module and realizes primarily of Windows API related function, its Windows API related function comprises ShellExecute function, FindWindow function, FindWindowEx function, GetDlgCtrlID function and SendMessage function
ShellExecute function is utilized to open Norma View software in power analyzer;
FindWindow function is utilized to obtain the handle of the Norma View window in power analyzer;
According to Norma View window handle, and FindWindowEx and GetDlgCtrlID function is utilized to obtain the handle ID of " run/suspend " and " preservation data " two knobs;
Utilize SendMessage function to send mouse information, realize the function that these two knobs are clicked in simulation;
Utilize SendMessage function to send press key message, realize analog input and preserve filename and shortcut " preservation " function;
Described computing function module carries ExcelApplication primarily of programming software, ExcelWorkbook and ExcelWorksheet control realizes,
ExcelApplication1.Connect function is utilized to open Excel table;
ExcelWorkbook1.ConnectTo function is utilized to add new workbook;
ExcelApplication1.Workbooks.Open function is utilized to open the harmonic data file of preservation;
Utilize ExcelApplication1.Cells [] .Value assignment function that data are pressed row again, facilitate mean value calculation;
ExcelApplication1.Cells [] .Value is utilized to do mean value calculation to 20 repeated sampling data;
And utilize the current harmonics numerical value in ExcelApplication1.SaveAs function preservation Excel table.
As shown in Figure 2, a kind of photovoltaic DC-to-AC converter current harmonics detection method, its step is specially:
1) power analyzer gathers the load rating power of tested photovoltaic DC-to-AC converter, the Norma View software collection current harmonics numerical value be embedded in by power analyzer;
2) PC is connected the Norma View software window of power analyzer by data converter and current harmonics detection data capture functional module, and catch the current harmonics button and preservation data button that read in Norma View software in power analyzer, simulation is clicked and is read harmonic wave button and preserve data button, current harmonics data file is preserved; Find harmonic data file according to storing path and filename and open;
3) in PC, create Excel table, and detects data capture functional module with current harmonics and be connected, current harmonics data file is imported to during Excel shows;
4) repeat aforesaid operations to N time, then Tentative Study of Achievement of Manipulation on Excel table is averaged and ratio to the data that N time gathers, and obtains final current harmonics data;
5) finally the current harmonics data in Excel table are preserved and printed;
Power analyzer of the present invention is Fluke Norma5000.
Data converter of the present invention adopts RS232 data converter, also can adopt Ethernet connected mode.
The invention has the beneficial effects as follows:
1. the present invention completes the detection of photovoltaic DC-to-AC converter current harmonics, and method is simple and convenient, shortens detection time, facts have proved that the test of original a couple of days only needs one or two hour by the invention process;
2. what this method finally exported is Excel table, facilitates subsequent treatment and the printing of data;
3. this method adopts multi-group data to average method process current harmonics data, ensures the accuracy of result.
Embodiment 1:
Step one is pressed shown in Fig. 1 and is connected computer, power analyzer and photovoltaic DC-to-AC converter, and RS232 or the Ethernet of preparation computer and power analyzer are connected, and self-programmed software opened by PC;
Step 2 photovoltaic DC-to-AC converter exports 30% rated power;
Step 3 clicks self-programmed software " 30% load " button; Self-compiling program will link Norma View software, and simulation is clicked " run/suspend ", data are preserved local by " preservation data " two knobs with particular file name, and repeated acquisition 20 secondary data is also preserved; Link Excel table, opens 20 successively and preserves file, data are rearranged sequence and averages in Excel table, preserves Excel table;
Step 4 opens the Excel table of preservation on PC, checks errorless rear printing.
Embodiment 2: less than 40 times (containing the 40 times) Harmonics data computings completing 50% power points output current by the step one in embodiment 1, two, three, four.
Embodiment 3: less than 40 times (containing the 40 times) Harmonics data computings completing 70%, 100% power points output current by the step one in embodiment 1, two, three, four.
Embodiment 4: less than 40 times (containing the 40 times) Harmonics data computings completing 100% power points output current by the step one in embodiment 1, two, three, four.
The invention has the beneficial effects as follows:
1. the present invention completes the detection of photovoltaic DC-to-AC converter current harmonics, and method is simple and convenient, shortens detection time, facts have proved that the test of original a couple of days only needs one or two hour by the invention process.
2. what this method finally exported is Excel table, facilitates subsequent treatment and the printing of data.
3. this method adopts multi-group data to average method process current harmonics data, ensures the accuracy of result.
Claims (5)
1. a photovoltaic DC-to-AC converter current harmonic detection system, it is characterized in that being provided with PC, power analyzer, tested photovoltaic DC-to-AC converter and data converter, described power analyzer is connected with tested photovoltaic DC-to-AC converter through data line, be connected with PC through data converter, described PC is embedded with current harmonics and detects data capture functional module and computing function module
Wherein, described current harmonics detects data capture functional module and realizes primarily of Windows API related function, its Windows API related function comprises ShellExecute function, FindWindow function, FindWindowEx function, GetDlgCtrlID function and SendMessage function
ShellExecute function is utilized to open Norma View software in power analyzer;
FindWindow function is utilized to obtain the handle of the Norma View window in power analyzer;
According to Norma View window handle, and FindWindowEx and GetDlgCtrlID function is utilized to obtain the handle ID of " run/suspend " and " preservation data " two knobs;
Utilize SendMessage function to send mouse information, realize the function that these two knobs are clicked in simulation;
Utilize SendMessage function to send press key message, realize analog input and preserve filename and shortcut " preservation " function;
Described computing function module carries ExcelApplication primarily of programming software, ExcelWorkbook and ExcelWorksheet control realizes,
ExcelApplication1.Connect function is utilized to open Excel table;
ExcelWorkbook1.ConnectTo function is utilized to add new workbook;
ExcelApplication1.Workbooks.Open function is utilized to open the harmonic data file of preservation;
Utilize ExcelApplication1.Cells [] .Value assignment function that data are pressed row again, facilitate mean value calculation;
ExcelApplication1.Cells [] .Value is utilized to do mean value calculation to 20 repeated sampling data;
And utilize the current harmonics numerical value in ExcelApplication1.SaveAs function preservation Excel table.
2. a kind of photovoltaic DC-to-AC converter current harmonics detection method according to claim 1, its step is specially:
1) power analyzer gathers the load rating power of tested photovoltaic DC-to-AC converter, the Norma View software collection current harmonics numerical value be embedded in by power analyzer;
2) PC is connected the Norma View software window of power analyzer by data converter and current harmonics detection data capture functional module, and catch the current harmonics button and preservation data button that read in Norma View software in power analyzer, simulation is clicked and is read harmonic wave button and preserve data button, current harmonics data file is preserved; Find harmonic data file according to storing path and filename and open;
3) in PC, create Excel table, and detects data capture functional module with current harmonics and be connected, current harmonics data file is imported to during Excel shows;
4) repeat aforesaid operations to N time, then Tentative Study of Achievement of Manipulation on Excel table is averaged and ratio to the data that N time gathers, and obtains final current harmonics data;
5) finally the current harmonics data in Excel table are preserved and printed.
3. a kind of photovoltaic DC-to-AC converter current harmonic detection system according to claim 1, is characterized in that described power analyzer is Fluke Norma5000.
4. a kind of photovoltaic DC-to-AC converter current harmonic detection system according to claim 1, is characterized in that described data converter adopts RS232 data converter.
5. a kind of photovoltaic DC-to-AC converter current harmonic detection system according to claim 1, is characterized in that described data converter adopts Ethernet connected mode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106841878A (en) * | 2017-03-29 | 2017-06-13 | 阳光电源股份有限公司 | A kind of photovoltaic inverter test system and method |
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| CN202583430U (en) * | 2012-03-05 | 2012-12-05 | 无锡盛莱得新能源科技有限公司 | Testing system for photovoltaic grid-connected inverter |
| CN203299286U (en) * | 2013-04-19 | 2013-11-20 | 国家电网公司 | Photovoltaic grid-connected inverter detection platform |
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| CN202583430U (en) * | 2012-03-05 | 2012-12-05 | 无锡盛莱得新能源科技有限公司 | Testing system for photovoltaic grid-connected inverter |
| CN203299286U (en) * | 2013-04-19 | 2013-11-20 | 国家电网公司 | Photovoltaic grid-connected inverter detection platform |
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| CN106841878A (en) * | 2017-03-29 | 2017-06-13 | 阳光电源股份有限公司 | A kind of photovoltaic inverter test system and method |
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