CN105182068A - System and method for testing adaptability of photovoltaic inverter to grid harmonic - Google Patents
System and method for testing adaptability of photovoltaic inverter to grid harmonic Download PDFInfo
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Abstract
The invention discloses a system and a method for testing the adaptability of a photovoltaic inverter to grid harmonic. The method comprises the steps as follows: arranging a photovoltaic inverting component, a two-way programmable alternating-current power supply, an intelligent controller and a data acquisition module, wherein the photovoltaic inverting component includes a photovoltaic inverter and a photovoltaic simulation device; changing the output power supply of the two-way programmable alternating-current power supply and the working state of the photovoltaic simulation device so as to acquire the voltage across the two ends of the photovoltaic inverter and the current of the photovoltaic inverter through the data acquisition module; and finally, obtaining the adaptability of the photovoltaic inverter to grid harmonic through testing. Under the condition of increasingly serious distribution network harmonic, the invention provides a photovoltaic inverter performance test system which is simple in structure and convenient to operate. Actual grid harmonic can be simulated, the adaptability of a photovoltaic inverter can be tested under the condition of background harmonic, and the test result is highly reliable.
Description
Technical field
The present invention relates to photovoltaic inverter grid-connected testing research field, be specifically related to a kind of for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics and method.
Background technology
Along with the development of society, society is increasing to the demand of electric energy, but traditional fossil energy is but day by day in short supply, seeks the main task that novel renewable energy has become social development process.Sun power, as a kind of clean regenerative resource, makes it have incomparable advantage relative to other new forms of energy with inexhaustible, nexhaustible, cheap, free of contamination feature.Distributed photovoltaic power will become power distribution network future source of energy developing direction.
Distributed photovoltaic power grid process is: the direct current that photovoltaic battery array sends is converted into after satisfactory alternating current through inverter, directly or access electrical network by transformer.In this process, inverter plays bridge beam action between distributed photovoltaic power and electrical network, and it normally works to grid-connected most important.But a large amount of some novel power electronic equipments of employing or power application electron controls technology in network system now, make in electrical network containing a large amount of background harmonicses.The existence of these background harmonicses can affect the operation of combining inverter, even inverter is caused to the damage of unrepairable.Therefore, it is necessary for studying photovoltaic DC-to-AC converter mains by harmonics fitness.
Summary of the invention
The object of the present invention is to provide a kind of for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics and method, by arranging photovoltaic inversion parts, two-way Programmable AC Power Source, intelligent controller and data acquisition module, wherein photovoltaic inversion parts comprise photovoltaic DC-to-AC converter, photovoltaic analogue means; Change the out-put supply of two-way Programmable AC Power Source, change the duty of photovoltaic analogue means, thus obtained voltage, the electric current at photovoltaic DC-to-AC converter two ends by data acquisition module, finally measure the mains by harmonics adaptability of photovoltaic DC-to-AC converter.Structure of the present invention is simple, easy to operate, and can simulate actual electric network harmonic wave situation, and test result reliability is higher.Therefore the test result that carry out of the present invention in practical engineering application is tested has higher reference value.
In order to achieve the above object, the present invention is achieved through the following technical solutions:
A kind of for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics, be characterized in, this test macro comprises:
Photovoltaic inversion parts, one end of described photovoltaic inversion parts is connected with outside public electric wire net;
Two-way Programmable AC Power Source, one end of described two-way Programmable AC Power Source is connected with the other end of described photovoltaic inversion parts, and the other end of this two-way Programmable AC Power Source is connected with outside public electric wire net;
Intelligent controller, is connected with described two-way Programmable AC Power Source;
Data acquisition module, the output terminal of described data acquisition module is connected with described intelligent controller, and multiple input ends of this data acquisition module are connected with described photovoltaic inversion parts respectively.
Preferably, described photovoltaic inversion parts comprise:
Photovoltaic analogue means, the input end of described photovoltaic analogue means is connected with outside public electric wire net;
Photovoltaic DC-to-AC converter, the first end of described photovoltaic DC-to-AC converter is connected with the output terminal of described photovoltaic analogue means, and the second end of this photovoltaic DC-to-AC converter is connected with one end of described two-way Programmable AC Power Source.
Preferably, multiple input ends of described data acquisition module are respectively: the first current measuring input, the second current measuring input, the first voltage measuring input and the second voltage measuring input;
Described first current measuring input, the first voltage measuring input are connected with the first end of described photovoltaic DC-to-AC converter respectively;
Described second current measuring input, the second voltage measuring input are connected with the second end of described photovoltaic DC-to-AC converter respectively.
Preferably, described intelligent controller is personal computer.
A kind of for the adaptive method of testing of photovoltaic DC-to-AC converter mains by harmonics, be characterized in, this method of testing comprises:
S1, under desirable operating mode, the working condition of test photovoltaic DC-to-AC converter;
S2, under harmonic wave operating mode, tests the working condition of described photovoltaic DC-to-AC converter.
Preferably, described step S1 comprises:
S1.1, adopts intelligent controller to set two-way Programmable AC Power Source outputting standard sine wave voltage, and the work of setting photovoltaic analogue means in a rated operation;
S1.2, first current measuring input of data acquisition module, the second current measuring input, the first voltage measuring input and the second voltage measuring input gather current value, the magnitude of voltage at photovoltaic DC-to-AC converter two ends respectively, and all data collected are sent to described intelligent controller;
S1.3, described intelligent controller carries out data analysis for the current value collected under desirable operating mode, magnitude of voltage, under obtaining desirable operating mode, the working condition of described photovoltaic DC-to-AC converter.
Preferably, described step S2 comprises:
S2.1, adopt described intelligent controller to set described two-way Programmable AC Power Source output harmonic wave voltage, this harmonic voltage can simulate actual electric network;
S2.2, sets the work of described photovoltaic analogue means in a rated operation;
S2.3, first current measuring input of described data acquisition module, the second current measuring input, the first voltage measuring input and the second voltage measuring input gather current value, the magnitude of voltage at described photovoltaic DC-to-AC converter two ends respectively, and all data collected are sent to described intelligent controller;
S2.4, described intelligent controller, to above-mentioned data analysis, when calculating the voltage total harmonic distortion factor <7% of described photovoltaic DC-to-AC converter, performs step S2.5;
When calculating voltage total harmonic distortion factor >=7% of described photovoltaic DC-to-AC converter, end operation;
S2.5, described intelligent controller resets described two-way Programmable AC Power Source and exports the harmonic voltage different from described step S2.1, jumps to step S2.2.
The present invention compared with prior art has the following advantages:
The invention provides a kind of for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics and method, by arranging photovoltaic inversion parts, two-way Programmable AC Power Source, intelligent controller and data acquisition module, wherein photovoltaic inversion parts comprise photovoltaic DC-to-AC converter, photovoltaic analogue means; Change the out-put supply of two-way Programmable AC Power Source, change the duty of photovoltaic analogue means, thus obtained voltage, the electric current at photovoltaic DC-to-AC converter two ends by data acquisition module, finally measure the mains by harmonics adaptability of photovoltaic DC-to-AC converter.When current power distribution network harmonic wave is day by day serious, the photovoltaic DC-to-AC converter Performance Test System that the present invention can provide a kind of structure simple, easy to operate, and actual electric network harmonic wave situation can be simulated, guarantee that background harmonics is when interior, the adaptability of test photovoltaic DC-to-AC converter, test result reliability is higher.
Accompanying drawing explanation
Fig. 1 is a kind of one-piece construction schematic diagram for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics of the present invention.
Fig. 2 is a kind of overall flow figure for the adaptive method of testing of photovoltaic DC-to-AC converter mains by harmonics of the present invention.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferably specific embodiment in detail, the present invention is further elaborated.
As shown in Figure 1, a kind of for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics, this test macro comprises: photovoltaic inversion parts 2, two-way Programmable AC Power Source 1, data acquisition module 3 and intelligent controller 4.In the present invention, intelligent controller 4 is personal computer.
Wherein, one end of photovoltaic inversion parts 2 is connected with outside public electric wire net, and the other end of photovoltaic inversion parts 2 is connected with the first end of two-way Programmable AC Power Source 1; Second end of this two-way Programmable AC Power Source 1 is connected with outside public electric wire net; 3rd end of two-way Programmable AC Power Source 1 is connected with intelligent controller 4.The output terminal of data acquisition module 3 is connected with intelligent controller 4, and multiple input ends of this data acquisition module 3 are connected with photovoltaic inversion parts 2 respectively.
As shown in Figure 1, photovoltaic inversion parts 2 comprise: photovoltaic DC-to-AC converter 21, photovoltaic analogue means 22.
Wherein, the input end of photovoltaic analogue means 22 is connected with outside public electric wire net.The first end of photovoltaic DC-to-AC converter 21 is connected with the output terminal of photovoltaic analogue means 22, and the second end of this photovoltaic DC-to-AC converter 21 is connected with one end of two-way Programmable AC Power Source 1.
In the present invention, it is grid-connected that photovoltaic DC-to-AC converter 21 is converted to alternating current for the direct current exported by photovoltaic apparatus.Photovoltaic analogue means 22 can set different mode of operations, thus the working condition of photovoltaic apparatus under different situations can be simulated.In the present invention, under photovoltaic analogue means 22 is set as being in specified mode of operation always.
As shown in Figure 1, multiple input ends of data acquisition module 3 are respectively: the first current measuring input, the second current measuring input, the first voltage measuring input and the second voltage measuring input.
First current measuring input, the first voltage measuring input are connected with the first end of photovoltaic DC-to-AC converter 21 respectively.Second current measuring input, the second voltage measuring input are connected with the second end of photovoltaic DC-to-AC converter 21 respectively.
In the present invention, data acquisition module 3 for gathering voltage, the current data at photovoltaic DC-to-AC converter 21 two ends, and is analyzed in above-mentioned data feeding intelligent controller 4.Intelligent controller 4 and two-way Programmable AC Power Source 1 carry out communication, set the output signal of two-way Programmable AC Power Source 1; This intelligent controller 4 simultaneously also for obtaining and analyzing the data that data acquisition module 3 collects, and processes analysis result and optimizes.
As shown in Figure 2, a kind of for the adaptive method of testing of photovoltaic DC-to-AC converter mains by harmonics, this method of testing comprises:
S1, under desirable operating mode, test photovoltaic DC-to-AC converter 21.This step S1 comprises:
S1.1, adopts intelligent controller 4 to set two-way Programmable AC Power Source 1 outputting standard sine wave voltage, and setting photovoltaic analogue means 22 works in a rated operation.
In the present embodiment, intelligent controller 4 sets the sine voltage signal that two-way Programmable AC Power Source 1 output frequency is 50Hz.
S1.2, first current measuring input of data acquisition module 3, the second current measuring input, the first voltage measuring input and the second voltage measuring input gather current value, the magnitude of voltage at photovoltaic DC-to-AC converter 21 two ends respectively, and all data collected are sent to intelligent controller 4.
S1.3, intelligent controller 4 carries out data analysis for the current value collected under desirable operating mode, magnitude of voltage, under obtaining desirable operating mode, the working condition of photovoltaic DC-to-AC converter 21.
Intelligent controller 4 carries out data analysis to the current value obtained, magnitude of voltage, and judge ideally, when overtone order h is odd number, whether the dark variability of photovoltaic DC-to-AC converter 21 meets the requirement of IEEE1574:
When meeting upper expression condition, record being carried out to the specific works situation of photovoltaic DC-to-AC converter 21, and carries out the operation of step S2.
S2, under harmonic wave operating mode, test photovoltaic DC-to-AC converter 21.This step S2 comprises:
S2.1, adopt intelligent controller 4 to set two-way Programmable AC Power Source 1 output harmonic wave voltage, this harmonic voltage can simulate actual electric network.
In the present embodiment, intelligent controller 4 sets the harmonic signal containing the specific frequency, amplitude and specific in two-way Programmable AC Power Source 1 output voltage.Wherein, the specific frequency in harmonic signal is 50Hz-2500Hz, is also the integral multiple of 50Hz with regard to this frequency, is preferably 100Hz.Amplitude and specific in harmonic signal is 50% of two-way Programmable AC Power Source 1 outputting standard sine wave voltage magnitude.
S2.2, setting photovoltaic analogue means 22 works in a rated operation.
S2.3, first current measuring input of data acquisition module 3, the second current measuring input, the first voltage measuring input and the second voltage measuring input gather current value, the magnitude of voltage at photovoltaic DC-to-AC converter 21 two ends respectively, and all data collected are sent to intelligent controller 4.
S2.4, intelligent controller 4, to above-mentioned data analysis, when calculating the voltage total harmonic distortion factor <7% of photovoltaic DC-to-AC converter 21, performs step S2.5.
When calculating voltage total harmonic distortion factor >=7% of photovoltaic DC-to-AC converter 21, end operation.
In the present embodiment, intelligent controller 4 carries out data analysis to the current value obtained, magnitude of voltage, judges whether photovoltaic DC-to-AC converter 21 serviceability after adding harmonic wave meets the requirement of IEEE1574.
S2.5, intelligent controller 4 resets two-way Programmable AC Power Source 1 and exports the harmonic voltage different from step S2.1, jumps to step S2.2.
Repeatedly change the harmonic content of two-way Programmable AC Power Source 1 output voltage, obtain the duty of photovoltaic DC-to-AC converter 21 under different harmonic wave operating mode, thus obtain photovoltaic DC-to-AC converter network harmonic fitness.
Although content of the present invention has done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (7)
1. for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, this test macro comprises:
Photovoltaic inversion parts, one end of described photovoltaic inversion parts is connected with outside public electric wire net;
Two-way Programmable AC Power Source, the first end of described two-way Programmable AC Power Source is connected with the other end of described photovoltaic inversion parts, and the second end of this two-way Programmable AC Power Source is connected with outside public electric wire net;
Intelligent controller, with described two-way Programmable AC Power Source three-terminal link;
Data acquisition module, the output terminal of described data acquisition module is connected with described intelligent controller, and multiple input ends of this data acquisition module are connected with described photovoltaic inversion parts respectively.
2. as claimed in claim 1 for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, described photovoltaic inversion parts comprise:
Photovoltaic analogue means, the input end of described photovoltaic analogue means is connected with outside public electric wire net;
Photovoltaic DC-to-AC converter, the first end of described photovoltaic DC-to-AC converter is connected with the output terminal of described photovoltaic analogue means, and the second end of this photovoltaic DC-to-AC converter is connected with the first end of described two-way Programmable AC Power Source.
3. as claimed in claim 2 for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, multiple input ends of described data acquisition module are respectively: the first current measuring input, the second current measuring input, the first voltage measuring input and the second voltage measuring input;
Described first current measuring input, the first voltage measuring input are connected with the first end of described photovoltaic DC-to-AC converter respectively;
Described second current measuring input, the second voltage measuring input are connected with the second end of described photovoltaic DC-to-AC converter respectively.
4. as claimed in claim 1 for the adaptive test macro of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, described intelligent controller is personal computer.
5. for the adaptive method of testing of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, this method of testing comprises:
S1, under desirable operating mode, the working condition of test photovoltaic DC-to-AC converter;
S2, under harmonic wave operating mode, tests the working condition of described photovoltaic DC-to-AC converter.
6. as claimed in claim 5 for the adaptive method of testing of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, described step S1 comprises:
S1.1, adopts intelligent controller to set two-way Programmable AC Power Source outputting standard sine wave voltage, and the work of setting photovoltaic analogue means in a rated operation;
S1.2, first current measuring input of data acquisition module, the second current measuring input, the first voltage measuring input and the second voltage measuring input gather current value, the magnitude of voltage at photovoltaic DC-to-AC converter two ends respectively, and all data collected are sent to described intelligent controller;
S1.3, described intelligent controller carries out data analysis for the current value collected under desirable operating mode, magnitude of voltage, under obtaining desirable operating mode, the working condition of described photovoltaic DC-to-AC converter.
7. as claimed in claim 5 for the adaptive method of testing of photovoltaic DC-to-AC converter mains by harmonics, it is characterized in that, described step S2 comprises:
S2.1, adopt described intelligent controller to set described two-way Programmable AC Power Source output harmonic wave voltage, this harmonic voltage can simulate actual electric network;
S2.2, sets the work of described photovoltaic analogue means in a rated operation;
S2.3, first current measuring input of described data acquisition module, the second current measuring input, the first voltage measuring input and the second voltage measuring input gather current value, the magnitude of voltage at described photovoltaic DC-to-AC converter two ends respectively, and all data collected are sent to described intelligent controller;
S2.4, described intelligent controller, to above-mentioned data analysis, when calculating the voltage total harmonic distortion factor <7% of described photovoltaic DC-to-AC converter, performs step S2.5;
When calculating voltage total harmonic distortion factor >=7% of described photovoltaic DC-to-AC converter, end operation;
S2.5, described intelligent controller resets described two-way Programmable AC Power Source and exports the harmonic voltage different from described step S2.1, jumps to step S2.2.
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| CN116819218A (en) * | 2023-08-30 | 2023-09-29 | 传麒科技(北京)股份有限公司 | Automatic testing method and system for inverter |
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Application publication date: 20151223 |