CN103197259B - Photovoltaic DC-to-AC converter testing apparatus - Google Patents
Photovoltaic DC-to-AC converter testing apparatus Download PDFInfo
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- CN103197259B CN103197259B CN201210004674.XA CN201210004674A CN103197259B CN 103197259 B CN103197259 B CN 103197259B CN 201210004674 A CN201210004674 A CN 201210004674A CN 103197259 B CN103197259 B CN 103197259B
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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
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Abstract
The present invention discloses a kind of photovoltaic DC-to-AC converter testing apparatus, it includes an electrical network AC analogue unit and at least one photovoltaic DC analogue unit, electrical network AC analogue unit includes the filter that the first frequency converter and that an input is connected to electrical network is connected to the first inverter output terminal, and the other end of filter is connected to the output of photovoltaic DC-to-AC converter to be tested and the input of photovoltaic DC analogue unit; Photovoltaic DC analogue unit includes the rectifier filter that the second frequency converter and that an input is connected with electrical network AC analogue unit is connected to the second inverter output terminal, the output of rectifier filter is connected to the input of photovoltaic DC-to-AC converter to be tested, the output of this photovoltaic DC-to-AC converter to be tested then accesses between electrical network AC analogue unit and photovoltaic DC analogue unit, and forms primary Ioops with photovoltaic DC analogue unit.The present invention can reduce testing cost and the required energy consumption of test of photovoltaic DC-to-AC converter test, and can test the feedback function of photovoltaic DC-to-AC converter.
Description
Technical field
The present invention relates to a kind of testing equipment, refer in particular to a kind of photovoltaic DC-to-AC converter testing apparatus.
Background technology
Under current energy starved situation, solar photovoltaic technology has become the new energy technology that various countries step up paces development.As the indispensable core component of photovoltaic generating system; the property relationship of photovoltaic DC-to-AC converter is to the power supply quality, operational reliability etc. of photovoltaic generating system; so; before it dispatches from the factory; must test the property indices comprising island protect function, load capacity, power factor (PF), overvoltage/undervoltage protection etc. of photovoltaic DC-to-AC converter, to ensure that photovoltaic DC-to-AC converter meets relevant design standard.
When testing photovoltaic DC-to-AC converter, need variable analog DC voltage as input voltage and variable analog AC voltage as grid-connected voltage, existing photovoltaic inverter test system often uses continuous-current plant and ac power supply apparatus to provide direct voltage needed for test and alternating voltage respectively, its shortcoming existed is mainly as follows: the market price 1, due to DC power supply and ac power supply apparatus is higher, causes the testing cost of photovoltaic DC-to-AC converter higher; 2, the electric energy that DC power supply and ac power supply apparatus export directly consumes, and is unfavorable for reducing the electric power energy consumption needed for test, also cannot test the feedback function of photovoltaic DC-to-AC converter simultaneously; 3, the DC power supply on market and ac power supply apparatus are common apparatus, and amateurly test for photovoltaic DC-to-AC converter.
Summary of the invention
Technical problem to be solved by this invention is that existing photovoltaic inverter test system exists that testing cost is high, energy consumption is large and cannot tests the defect of photovoltaic DC-to-AC converter feedback function, provides a kind of accordingly and reduces testing cost, reduce energy consumption and can test the photovoltaic DC-to-AC converter testing apparatus of feedback function.
For solving the problems of the technologies described above, the present invention adopts technical scheme as described below: a kind of photovoltaic DC-to-AC converter testing apparatus, include an electrical network AC analogue unit and at least one photovoltaic DC analogue unit, wherein, described electrical network AC analogue unit includes the filter that the first frequency converter and that an input is connected to electrical network is connected to described first inverter output terminal, the other end of described filter is connected to the output of photovoltaic DC-to-AC converter to be tested and the input of described photovoltaic DC analogue unit, three-phase alternating current from electrical network carries out voltage-regulation by described first frequency converter, and the grid-connected voltage exported after the filtering process harmonic wave of described filter for simulating photovoltaic DC-to-AC converter to be tested, and send into described photovoltaic DC analogue unit using the starting resistor as photovoltaic DC-to-AC converter to be tested, described photovoltaic DC analogue unit includes the rectifier filter that the second frequency converter and that an input is connected with described electrical network AC analogue unit is connected to described second inverter output terminal, the output of described rectifier filter is connected to the input of photovoltaic DC-to-AC converter to be tested, the output of this photovoltaic DC-to-AC converter to be tested then accesses between described electrical network AC analogue unit and photovoltaic DC analogue unit, and form primary Ioops with described photovoltaic DC analogue unit, input to the voltage-regulation of three-phase alternating current through described second frequency converter of described second frequency converter, after the rectifying and wave-filtering of rectifier filter forms direct current, send into photovoltaic DC-to-AC converter to be tested to input as analog DC voltage.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, access one between the input of described filter and photovoltaic DC analogue unit, the output of photovoltaic DC-to-AC converter to be tested for the first electrical network isolator of electrical isolation.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, described first electrical network isolator select voltage ratio be 1: 1 isolating transformer.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, have access to one between the output of the input of described second frequency converter and the output of described electrical network AC analogue unit, photovoltaic DC-to-AC converter to be tested for the second electrical network isolator of electrical isolation.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, described second electrical network isolator select voltage ratio be 1: 1 isolating transformer.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, between described second frequency converter and rectifier filter, have access to a step-up transformer, carry out voltage lifting for the alternating current exported described second frequency converter.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, described rectifier filter is provided with n road in parallel and exports (n >=2), and n-1 road at least wherein exports upper cut-in relay.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, set photovoltaic DC analogue unit is n (n >=2) in parallel, its input is connected in parallel in the output of described electrical network AC analogue unit, output then accesses the different direct-flow input ends in photovoltaic DC-to-AC converter to be tested respectively, the output of photovoltaic DC-to-AC converter to be tested then accesses between described electrical network AC analogue unit and photovoltaic DC analogue unit, and forms loop with n photovoltaic DC analogue unit.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, set photovoltaic DC analogue unit is n (n >=2) in parallel, its input is connected in parallel in the output of described electrical network AC analogue unit, output then accesses the direct-flow input end in corresponding photovoltaic DC-to-AC converter to be tested respectively, the output parallel connection of n photovoltaic DC-to-AC converter to be tested accesses between described electrical network AC analogue unit and photovoltaic DC analogue unit, and forms loop with n photovoltaic DC analogue unit.
In above-mentioned photovoltaic DC-to-AC converter testing apparatus, described rectifier filter includes the filter capacitor that a rectifier bridge and is parallel to described rectifier bridge DC side, and described rectifier bridge selects three phase full wave rectification bridge.
Advantageous Effects of the present invention is: the electrical network AC analogue unit of this photovoltaic DC-to-AC converter testing apparatus and the circuit of photovoltaic DC analogue unit form very simple, and photovoltaic DC-to-AC converter to be tested and photovoltaic DC analogue unit form primary Ioops, the interchange of photovoltaic DC-to-AC converter to be tested exports and can be fed back to photovoltaic DC analogue unit to input as its alternating current, this testing cost being all conducive to reducing energy consumption and reducing photovoltaic DC-to-AC converter, in addition, because photovoltaic DC-to-AC converter to be tested and photovoltaic DC analogue unit form primary Ioops, the feedback function test of photovoltaic DC-to-AC converter to be tested can be realized.
Accompanying drawing explanation
Fig. 1 is the frame principle figure of the first embodiment of the present invention.
Fig. 2 is the frame principle figure of the second embodiment of the present invention.
Fig. 3 is the frame principle figure of the third embodiment of the present invention.
Fig. 4 is the frame principle figure of the fourth embodiment of the present invention.
Embodiment
For making those of ordinary skill in the art clearly understand technical problem to be solved by this invention, technical scheme and Advantageous Effects, below in conjunction with drawings and Examples, the present invention is further elaborated.
Photovoltaic DC-to-AC converter testing apparatus disclosed in this invention is mainly used in the test of grid-connected photovoltaic inverter, consult Fig. 1, this photovoltaic DC-to-AC converter testing apparatus includes electrical network AC analogue unit 10 and a photovoltaic DC analogue unit 20, and it is respectively used to as photovoltaic DC-to-AC converter 30 to be tested provides synchronization AC voltage and input direct voltage.
This electrical network AC analogue unit 10 is for simulating the grid-connected voltage of photovoltaic DC-to-AC converter 30 to be tested, it includes the filter 110 that the first frequency converter 100 and that an input is connected to electrical network 40 is connected to this first frequency converter 100 output, the other end of this filter 110 is connected to the output of this photovoltaic DC-to-AC converter 30 to be tested and the input of photovoltaic DC analogue unit 20, three-phase alternating current from electrical network 40 carries out voltage-regulation by this first frequency converter 100, and through this filter 110 filtering process and after eliminating the harmonic wave in output voltage waveforms, export the grid-connected voltage for simulating photovoltaic DC-to-AC converter 30 to be tested, and send into photovoltaic DC analogue unit 20 using the starting resistor as photovoltaic DC-to-AC converter 30 to be tested.By regulating this first frequency converter 100, the adjustment of the grid-connected voltage of photovoltaic DC-to-AC converter 30 can be realized.
Preferably, between the output of the input of this filter 110 and photovoltaic DC analogue unit 20, photovoltaic DC-to-AC converter to be tested 30, one is accessed for the first electrical network isolator 120 of electrical isolation, with the impact of harmonic carcellation for circuit.Aptly, the optional voltage ratio of this first electrical network isolator 120 is the isolating transformer of 1: 1.
The second frequency converter 200 and one that this photovoltaic DC analogue unit 20 includes that an input is connected with this electrical network AC analogue unit 10 is connected to the rectifier filter 210 of this second frequency converter 200 output, the output of this rectifier filter 210 is connected to the input of photovoltaic DC-to-AC converter 30 to be tested, the output of this photovoltaic DC-to-AC converter 30 to be tested then accesses between this electrical network AC analogue unit 10 and photovoltaic DC analogue unit 20, and forms primary Ioops with this photovoltaic DC analogue unit 20.Input to the voltage-regulation of three-phase alternating current through this second frequency converter 200 of this second frequency converter 200, after the rectifying and wave-filtering of this rectifier filter 210 forms level and smooth direct current, send into this inverter 30 to be tested using as analog DC voltage.
In this embodiment, this rectifier filter 210 includes the filter capacitor that a rectifier bridge and is parallel to this rectifier bridge DC side, is filtered into level and smooth direct current for the AC rectification that exported by the second frequency converter 200.Preferably, the rectifier bridge of this rectifier filter 210 selects three phase full wave rectification bridge.
Preferably, one is had access to for the second electrical network isolator 220 of electrical isolation, to suppress to input to the interference of the harmonic wave in the three-phase alternating current of this second frequency converter 200 for circuit between the output of the input of this second frequency converter 200 and the output of electrical network AC analogue unit 10, photovoltaic DC-to-AC converter to be tested 30.Aptly, the optional voltage ratio of this second electrical network isolator 220 is the isolating transformer of 1: 1.
Preferably; a step-up transformer 230 is had access between this second frequency converter 200 and rectifier filter 210; alternating current for exporting the second frequency converter 200 carries out voltage lifting, to meet the voltage requirements that photovoltaic DC-to-AC converter 30 carries out the required direct current input of overvoltage protection test.
During test, photovoltaic DC-to-AC converter 30 to be tested is connected in photovoltaic DC-to-AC converter testing apparatus, certainly, photovoltaic DC-to-AC converter testing apparatus involved in the present invention also includes such as other equipment and instruments such as power analyzer, man-machine interactive operation system, because these equipment and instruments access in testing apparatus to detect the technology of photovoltaic DC-to-AC converter known by the public, so repeat no more in the present invention.According to the needs of photovoltaic DC-to-AC converter 30 output AC voltage, regulate the first frequency converter 110 and make the grid-connected voltage of simulation reach the grid-connected voltage request of photovoltaic DC-to-AC converter 30, further, according to the requirement of photovoltaic DC-to-AC converter 30 DC input voitage, regulate the second frequency converter 200 and make DC input voitage reach test request, subsequently, by man-machine interactive operation system and power analyzer, photovoltaic DC-to-AC converter is tested.And after testing apparatus working stability, namely photovoltaic DC analogue unit 20 (can comprise the second electrical network isolator 220, second frequency converter 200, step-up transformer 230 and the rectifier filter 210 that connect in turn) and photovoltaic DC-to-AC converter 30 form a loop, thus can realize the feedback function test of photovoltaic DC-to-AC converter 30.
From upper, the circuit of the electrical network AC analogue unit 10 that the present invention configures and photovoltaic DC analogue unit 20 forms very simple, and the interchange of photovoltaic DC-to-AC converter 30 output can be fed back to photovoltaic DC analogue unit 20 to input as its alternating current, this testing cost being all conducive to reducing energy consumption and reducing photovoltaic DC-to-AC converter.
Fig. 2 shows another embodiment of the present invention, it is applicable to the test requiring the photovoltaic DC-to-AC converter having single channel input or have the identical dual input of input voltage, it is with the difference of a upper embodiment: the rectifier filter 210 of photovoltaic DC analogue unit 20 is provided with two tunnels in parallel and exports, and a road wherein has access to a relay 240 in exporting.Like this, in the test process of photovoltaic DC-to-AC converter, if photovoltaic DC-to-AC converter to be tested only needs single channel direct current to input, then disconnect relay 240 wherein; If photovoltaic DC-to-AC converter to be tested needs two road direct current input, then closed relays 240 wherein.Certainly, also can in two tunnels of this rectifier filter 210 export equal cut-in relays 240, by the switch control rule to two relays 240, for photovoltaic DC-to-AC converter to be tested provides required single channel or two-way direct current input.
Based on basis embodiment illustrated in fig. 2, those having ordinary skill in the art will appreciate that ground, n (n >=2) road in parallel can be provided with export at rectifier filter 210 place, and n-1 road at least wherein exports upper cut-in relay 240, like this, make this testing apparatus be applicable to require to have the test of photovoltaic DC-to-AC converter of the identical direct current input of 1 ~ n road voltage.
Consult Fig. 3, it illustrates the third embodiment of the present invention, this photovoltaic DC-to-AC converter testing apparatus includes an electrical network AC analogue unit 10 and multiple photovoltaic DC analogue unit 20, multiple photovoltaic DC analogue unit 20 is arranged in parallel, its input is connected in parallel in the output of this electrical network AC analogue unit 10, its output then accesses the different direct-flow input ends in photovoltaic DC-to-AC converter 30 to be tested respectively, can be photovoltaic DC-to-AC converter 30 to be tested and the analog DC that plurality of voltages is identical or voltage is different input is provided, the output of photovoltaic DC-to-AC converter 30 to be tested then accesses between this electrical network AC analogue unit 10 and photovoltaic DC analogue unit 20, and form loop with multiple photovoltaic DC analogue unit 20 be arranged in parallel.The testing apparatus of this structure can be used for the test that requirement has the photovoltaic DC-to-AC converter of the identical or different DC input voitage of multichannel.
Composition graphs 4 is to illustrate the fourth embodiment of the present invention, in this embodiment, this photovoltaic DC-to-AC converter testing apparatus includes an electrical network AC analogue unit 10 and multiple photovoltaic DC analogue unit 20, multiple photovoltaic DC analogue unit 20 is arranged in parallel, its input is connected in parallel in the output of this electrical network AC analogue unit 10, its output then accesses the direct-flow input end in corresponding photovoltaic DC-to-AC converter 30 to be tested respectively, thus test while realizing multiple photovoltaic DC-to-AC converter 30, the output parallel connection of photovoltaic DC-to-AC converter 30 to be tested accesses between this electrical network AC analogue unit 10 and photovoltaic DC analogue unit 20, and form loop with multiple photovoltaic DC analogue unit 20 be arranged in parallel.Test while the testing apparatus of this structure can be used for multiple stage photovoltaic DC-to-AC converter.
The foregoing is only the preferred embodiments of the present invention, but not any pro forma restriction is done to the present invention.Those skilled in the art can impose various equivalent change and improvement on the basis of above-described embodiment, and all equivalent variations of doing in right or modification, all should fall within protection scope of the present invention.
Claims (10)
1. a photovoltaic DC-to-AC converter testing apparatus, is characterized in that: described photovoltaic DC-to-AC converter testing apparatus includes n (n >=2) photovoltaic DC analogue unit (20) of an electrical network AC analogue unit (10) and parallel connection, wherein,
Described electrical network AC analogue unit (10) includes the filter (110) that the first frequency converter (100) and that an input is connected to electrical network is connected to described first frequency converter (100) output, the other end of described filter (110) is connected to the output of photovoltaic DC-to-AC converter to be tested (30) and the input of described photovoltaic DC analogue unit (20), three-phase alternating current from electrical network carries out voltage-regulation by described first frequency converter (100), and the grid-connected voltage exported after the filtering process harmonic wave of described filter (110) for simulating photovoltaic DC-to-AC converter to be tested (30), and send into described photovoltaic DC analogue unit (20) using the starting resistor as photovoltaic DC-to-AC converter to be tested (30),
The output of described electrical network AC analogue unit (10) is connected to after the input parallel connection of n photovoltaic DC analogue unit (20), its output then accesses the direct-flow input end in corresponding photovoltaic DC-to-AC converter to be tested (30) respectively, each photovoltaic DC analogue unit (20) includes the rectifier filter (210) that the second frequency converter (200) and that an input is connected with described electrical network AC analogue unit (10) is connected to described second frequency converter (200) output, the output of described rectifier filter (210) is connected to the input of corresponding photovoltaic DC-to-AC converter to be tested, the output of photovoltaic DC-to-AC converter to be tested (30) then accesses between described electrical network AC analogue unit (10) and photovoltaic DC analogue unit (20), and form primary Ioops with corresponding photovoltaic DC analogue unit (20), input to the voltage-regulation of three-phase alternating current through described second frequency converter (200) of described second frequency converter (200), after the rectifying and wave-filtering of rectifier filter (210) forms direct current, send into corresponding photovoltaic DC-to-AC converter to be tested (30) to input as analog DC voltage.
2. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, is characterized in that: access one between the output of the input of described filter (110) and photovoltaic DC analogue unit (20), photovoltaic DC-to-AC converter to be tested (30) for the first electrical network isolator (120) of electrical isolation.
3. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 2, is characterized in that: described first electrical network isolator (120) selects voltage ratio to be the isolating transformer of 1:1.
4. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, is characterized in that: have access to one between the output of the input of described second frequency converter (200) and the output of described electrical network AC analogue unit (10), photovoltaic DC-to-AC converter to be tested (30) for the second electrical network isolator (220) of electrical isolation.
5. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 4, is characterized in that: described second electrical network isolator (220) selects voltage ratio to be the isolating transformer of 1:1.
6. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, it is characterized in that: between described second frequency converter (200) and rectifier filter (210), have access to a step-up transformer (230), carry out voltage lifting for the alternating current exported described second frequency converter (200).
7. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, it is characterized in that: described rectifier filter (210) is provided with n road in parallel and exports (n >=2), and n-1 road at least wherein exports upper cut-in relay (240).
8. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, it is characterized in that: set photovoltaic DC analogue unit (20) is n (n >=2) in parallel, the output of described electrical network AC analogue unit (10) is connected to after its input parallel connection, its output then accesses the different direct-flow input ends in photovoltaic DC-to-AC converter to be tested (30) respectively, the output of photovoltaic DC-to-AC converter to be tested (30) then accesses between described electrical network AC analogue unit (10) and photovoltaic DC analogue unit (20), and form loop with n photovoltaic DC analogue unit (20).
9. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, it is characterized in that: set photovoltaic DC analogue unit (20) is n (n >=2) in parallel, the output of described electrical network AC analogue unit (10) is connected to after its input parallel connection, its output then accesses the direct-flow input end in corresponding photovoltaic DC-to-AC converter to be tested (30) respectively, the output parallel connection of n photovoltaic DC-to-AC converter to be tested (30) accesses between described electrical network AC analogue unit (10) and photovoltaic DC analogue unit (20), and form loop with n photovoltaic DC analogue unit (20).
10. photovoltaic DC-to-AC converter testing apparatus as claimed in claim 1, it is characterized in that: described rectifier filter (210) includes the filter capacitor that a rectifier bridge and is parallel to described rectifier bridge DC side, and described rectifier bridge selects three phase full wave rectification bridge.
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| CN104730368A (en) * | 2013-12-20 | 2015-06-24 | 北车大连电力牵引研发中心有限公司 | Frequency converter testing system and method |
| CN105301404A (en) * | 2015-11-16 | 2016-02-03 | 国家电网公司 | Solar cell simulator used for photovoltaic grid-connected inverter detection |
| CN106533360A (en) * | 2016-11-01 | 2017-03-22 | 常州天合光能有限公司 | Portable outdoor power test device and test method for photovoltaic assemblies |
| CN107589355B (en) * | 2017-10-18 | 2023-12-05 | 昆山迈征自动化科技有限公司 | Inverter performance testing device |
| CN108732441A (en) * | 2018-05-07 | 2018-11-02 | 天津瑞能电气有限公司 | A kind of aging testing system based on current transformer product |
| CN111579906A (en) * | 2020-05-19 | 2020-08-25 | 天津瑞能电气有限公司 | High-power inverter test platform |
| CN116243096B (en) * | 2023-05-10 | 2023-07-21 | 深圳弘远电气有限公司 | Test circuit for high-power conversion device of weak power grid and control method thereof |
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| US7906870B2 (en) * | 2006-10-13 | 2011-03-15 | Pv Powered, Inc. | System and method for anti-islanding, such as anti-islanding for a grid-connected photovoltaic inverter |
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