CN202275115U - Photovoltaic electric energy conversion device noise source internal impedance extraction system based on power method - Google Patents
Photovoltaic electric energy conversion device noise source internal impedance extraction system based on power method Download PDFInfo
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- CN202275115U CN202275115U CN2011203605864U CN201120360586U CN202275115U CN 202275115 U CN202275115 U CN 202275115U CN 2011203605864 U CN2011203605864 U CN 2011203605864U CN 201120360586 U CN201120360586 U CN 201120360586U CN 202275115 U CN202275115 U CN 202275115U
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Abstract
A photovoltaic electric energy conversion device noise source internal impedance extraction system based on a power method is characterized by comprising a DC artificial mains network (DC-AMN), an AC artificial mains network(AC-AMN), a frequency spectrum analyzer, a host computer possessing corresponding software, 50 omega matching impedance, a coupling capacitor, a resistive load and a tested device. By employing the technology scheme disclosed by the utility model, the conduction electromagnetic interference noise source internal impedance of a photovoltaic electric energy conversion device can be tested rapidly and effectively, and the corresponding phase information of the noise source internal impedance can be obtained via the processing of the host computer. By using the method of the utility model, engineering experiences are not needed, the used devices are low in price, so that the design of a conduction electromagnetic interference filter can be guided better.
Description
Technical field
The utility model belongs to photovoltaic system electromagnetic interference noise source internal impedance and measures and the technical field of analyzing.
Background technology
In miniwatt photovoltaic electric energy converting system, contain a large amount of transformation of electrical energy devices such as high frequency switch power transducer etc.Along with these device for converting electric energy performances improve constantly, it will cause a large amount of Conducted Electromagnetic Interference of generation (electromagnetic interference, EMI) noise on the line of electric force.Adopt electromagnetic interface filter can effectively solve the Conducted Electromagnetic Interference problem.And in the electromagnetic interface filter design process, need the coupling of consideration of noise source internal impedance and loaded impedance can reach the maximum impedance mismatch, thereby suppress conducted electromagnetic interference noise preferably with the wave filter of realizing design.Simultaneously, according to the difference of switching power converters Conducted Electromagnetic Interference mechanism of production, can noise be divided into common-mode noise and differential mode noise, dissimilar noise transmission approach and inhibition method have nothing in common with each other.So need extract, and the different modalities noise resistance makes it more targeted aspect the inhibition noise to instruct Design of Filter on the switching power converters.
Mainly contain based on double-current probe method (Kye Yak See to switching power converters conducted noise source internal impedance extraction system at present; Junhong Deng. Measurement of Noise Source Impedance of SMPS Using a Two Probe Approach. [J] IEEE Trans. on power electronics; 2,004 19 (3): 862-868.), single current probe method (Yang Zhao; Xiaoquan Lu; Yinghua Dong ect. Study on Impedance Extraction Methods Applied in Conductive EMI Source Modeling. [C] Beijing 2010APEMC, 2010:215-219.), scattering parameter method (Bo Hu; Kye Yak See; Weng-Yew, C.R.; Evaluation of ferrite core EMI suppression under realistic working conditions [C] Singapore 2008 APEMC; 2008:774-777.) and voltage insertion loss method (Dongbing Zhang; Dan Y Chen, Mark J Nave ect. Measurement of Noise Source Impedance of Off-Line Converters. [J] IEEE Trans. on power electronics 2,000 15 (5): the system of 820-825.) being built.Wherein, Double-current probe method, single current probe method and scattering parameter method mainly utilize signal generation apparatus, high-frequency current probe and signal receiving device to build test platform; Inject main circuit through coupling capacitance high-frequency signal that frequency is known, thereby receiving trap obtains the noise source internal impedance amplitude size that corresponding frequency signal in the circuit is tried to achieve this frequency through the decoupling capacitance test.Voltage insert the loss test system mainly utilize filter unit load before and after voltage situation of change and then obtain the size of noise source internal impedance on the test resistance.This method needs at first survey noise source internal impedance size to be estimated when realizing, to determine adopting series connection to insert loss method or parallel connection insertion loss method; Secondly, carry out choosing of filter unit, make that the impedance between filter unit and the noise source impedance satisfies the method requirement according to the noise resistance of being estimated.
When utilizing current probe to test, its test macro is built comparatively complicated; When scattering parameter was tested, its core component vector network analyzer involved great expense complicated operation; When voltage inserted the test of loss method, it needed stronger engineering experience, selects suitable filter unit.Simultaneously; In the noise source internal impedance is extracted; The size of phase information has also determined the quality of Design of Filter performance to a great extent; In present existing test macro, only there is method of testing is complicated, testing apparatus is expensive scattering parameter method can directly obtain the phase information of tested noise source internal impedance, other all adopt indirect method to obtain phase information referring to application number 200710025281.6 patents.
The utility model content
In order to overcome the deficiency of existing noise source internal impedance method for distilling; This patent proposes a kind of photovoltaic transformation of electrical energy system noise source internal impedance extraction system of inserting the loss method based on power; This system can adopt comparatively easy method to extract the noise source internal impedance of photovoltaic transformation of electrical energy device; Simultaneously can obtain its respective phase information, thereby can instruct Filter Design all sidedly, to suppress the conducted electromagnetic interference noise of photovoltaic electric energy converting system.
The present invention adopts following technical scheme: based on power method photovoltaic transformation of electrical energy system noise source internal impedance extraction system; It is characterized in that this system is made up of direct current artificial mains network (DC-AMN), AC artificial electric power network (AC-AMN), spectrum analyzer, the host computer that possesses corresponding software, 50 Ω matched impedances, coupling capacitance, resistive load and equipment under test.
The direct current that solar panels are produced is connected with tested transformation of electrical energy device through the direct current artificial mains network, uploads defeated potential high-frequency electromagnetic interference noise of coming in order to isolated sun power electroplax; The output terminal of transformation of electrical energy device is linked to each other with the tested interface of AC artificial electric power network (EUT port); The power connector end mouth of AC artificial electric power network is connected with resistive load; When making test photovoltaic transformation of electrical energy system noise source internal impedance, equipment under test is in running order.
Utilize 50 Ω matched impedances that the prevention at radio-frequency port of direct current artificial mains network and AC artificial electric power network is carried out matched termination; Disperse by these prevention at radio-frequency port to prevent inner high frequency noise current; Simultaneously prevent that also the high frequency noise in the space is coupled in the Circuits System through these prevention at radio-frequency port, thereby reduce measuring accuracy.
Aspect test circuit, the signal output part of frequency spectrograph is linked to each other with main circuit through coupling capacitance, its signal receiving end links to each other with main circuit through another coupling capacitance, in order to the reception power signal that signal output part sent.
After the noise source internal impedance of inserting the loss method based on power was extracted and mainly added noise source according to test macro, power inserted the size of loss and then tries to achieve the noise source internal impedance value.It is simple to operate, and need not tested noise source internal impedance is estimated.Power inserts the definition of loss method shown in (1) formula:
Wherein, P1 is a watt level when not adding tested noise source in the test macro, and P2 is that test macro inserts watt level after the tested noise source.
Utilize power to insert the loss method and carry out during the noise source internal impedance extracts, power P 1 size when at first test does not add tested noise source, Fig. 3 is its test philosophy figure.
Wherein, US and ZS are the power signal generating means among the empty frame A, and ZL is that power receives impedance among the empty frame B, and UL is for accepting voltage.Then P1 is suc as formula shown in (2):
When adding tested noise source in the test macro, Fig. 4 is its schematic diagram, and wherein, ZN is tested noise source, and then P2 is suc as formula shown in (3):
By (3), (4) two formula available powers insert loss method noise source internal impedance extraction formula and are:
（4）
Because power output unit internal impedance ZS and power receiving element internal impedance ZL provide (normally pure resistive 50 Ω) by instrument supplier in the test macro in instructions.Therefore, can try to achieve tested noise source internal impedance suc as formula shown in (5):
Wherein, K can be known by (6) formula that for inserting the loss test result K can be expressed as:
Owing to common-mode noise source internal impedance is different with differential mode noise source internal impedance generation reason, therefore when adopting this method to test, need test circuit to be connected according to the difference of noise resistance mode.When test common-mode noise internal impedance, its test circuit is connected according to the disclosed method of attachment of Fig. 5; During test differential mode noise internal impedance, its test circuit is connected according to the disclosed method of attachment of Fig. 6.
After testing the size of inserting loss IL, the frequency spectrograph data are sent in the host computer, can obtain the amplitude information of the conducted electromagnetic interference noise internal impedance of tested photovoltaic transformation of electrical energy device through corresponding software.
Simultaneously, this host computer carries the phase information that Hilbert conversion software obtains the noise source internal impedance automatically through inside after obtaining impedance magnitude information.When carrying out the Hilbert conversion, its inside is regarded as reversible cause and effect systems stabilisation, the i.e. system function of minimum phase with the noise source internal impedance.Then this noise source internal impedance can satisfy the condition of Hilbert conversion.Definition impedance causal function is suc as formula shown in (7):
(7) formula is taken the logarithm and can be obtained
By system is that condition of minimum phase can draw system
and is the conclusion of causal system; Therefore, be that real part and imaginary part also satisfy the Hilbert transformation relation shown in (9) formula:
According to the condition of (9) formula and Hilbert conversion, can draw the phase information expression formula of tested noise resistance:
（10）
Adopt technical scheme disclosed by the invention, can comparatively fast and effeciently test the conducted electromagnetic interference noise source internal impedance of photovoltaic device for converting electric energy, and can obtain noise source internal impedance respective phase information through the processing of host computer.This method need not engineering experience, the equipment price that uses cheap, its result can instruct the Conducted Electromagnetic Interference Filter Design preferably.
The utility model method compared with prior art among the extraction of noise source internal impedance, has been avoided employing high-frequency current probe; Uncommon testing apparatus such as frequency spectrograph; Simultaneously, utilize comparatively simple method test noise source internal impedance, need not engineering experience can directly measure.
In the extraction to noise source impedance phase information; The present invention adopts software approach to extract, and has avoided the such expensive instrument of employing vector network analyzer, has reduced use cost; Simultaneously, test result can instruct the Conducted Electromagnetic Interference Filter Design preferably.
Description of drawings
Fig. 1 is based on power method photovoltaic transformation of electrical energy system noise source internal impedance extraction system process flow diagram;
Fig. 2 connects synoptic diagram based on power method photovoltaic transformation of electrical energy system noise source internal impedance extraction system;
Power inserted the loss method and extracts noise source internal impedance schematic diagram before Fig. 3 noise source added;
Fig. 4 noise source adds back power and inserts loss method extraction noise source internal impedance schematic diagram;
Fig. 5 common-mode noise source internal impedance test circuit and main circuit connection layout;
Fig. 6 differential mode noise source internal impedance test circuit and main circuit connection layout;
Fig. 7 common-mode noise source internal impedance test result;
Fig. 8 differential mode noise source internal impedance test result;
Fig. 9 common-mode noise source internal impedance phase information;
Figure 10 differential mode noise source internal impedance phase information.
Embodiment
Spectrum analyzer (GW GSP-827) is gone up output terminal and coupling capacitance C
1Link to each other, make its injecting power signal in main circuit.This power signal is through coupling capacitance C
2Link to each other with the frequency spectrograph input end, thereby try to achieve switching power converters noise source internal impedance through its power attenuation.
When test common-mode noise internal impedance, according to the characteristics of common mode noise current transmission path, coupling capacitance C
1One end links to each other with the live wire of photovoltaic transformation of electrical energy device, and the other end links to each other with the frequency spectrograph output signal port; Coupling capacitance C
2One end links to each other with photovoltaic transformation of electrical energy device center line, and the other end links to each other with frequency spectrograph input signal mouth.Simultaneously the frequency spectrograph ground wire is linked to each other with photovoltaic transformation of electrical energy device ground wire.Influence measuring accuracy in order to prevent common mode noise current from getting into the artificial mains network, should between photovoltaic transformation of electrical energy device and artificial mains network, insert the common mode choke L that inductance value is about 16mH
CM, the radio frequency delivery outlet with the artificial mains network adopts 50 Ω loaded impedances to mate simultaneously.
When test differential mode noise internal impedance, according to the characteristics in differential mode noise current delivery path, with coupling capacitance C
1, C
2One end all links to each other with the live wire of photovoltaic transformation of electrical energy device, and the other end links to each other with frequency spectrograph output, input signal mouth respectively.Simultaneously the frequency spectrograph ground wire is passed through coupling capacitance C
3Link to each other with the center line of photovoltaic transformation of electrical energy device.Influence measuring accuracy in order to prevent the differential mode noise electric current from getting into the artificial mains network, should between photovoltaic transformation of electrical energy device and artificial mains network, insert the differential mode inductance L that inductance value is about 350 μ H
DM
According to the test platform of being built the device common code impedance of photovoltaic transformation of electrical energy and the differential mode impedance of certain model noise source internal impedance the unknown are tested, its concrete operations are following:
1, need to confirm the mode of test equipment under test noise source impedance.
2, according to the different modalities impedance test circuit is connected.
3, when test macro does not add tested noise source; Two coupling capacitances and main circuit link are carried out short circuit; And open the SONOAN calibration of power page; Power when test macro is not inserted noise source is calibrated, and calculates for convenient, and calibrating usually and inserting it into loss power is 0dBm.
4, insert tested noise source, the insertion loss power size of test test macro this moment.
5, import the data of being tested into host computer, thereby obtain the amplitude size and the respective phase information of tested noise resistance.In the present case, tested noise source internal impedance common mode amplitude is referring to Fig. 7; The differential mode amplitude is referring to Fig. 8, and the common code impedance phase information is referring to Fig. 9, and differential mode impedance phase information is referring to Figure 10.
Can be found out that by Fig. 7 this photovoltaic transformation of electrical energy device common-mode noise source internal impedance low-frequency range resistance is higher, along with frequency rises, its impedance descends thereupon, presents capacitive in whole frequency, meets the common-mode noise characteristics.Can be found out that by Fig. 8 its differential mode noise low-frequency impedance is lower, along with frequency rises, its impedance is risen thereupon, presents perception in whole frequency, meets the differential mode noise characteristics.Result according to measuring can instruct the different modalities Filter Design, to reach the effect that suppresses this photovoltaic device for converting electric energy conducted electromagnetic interference noise.
Claims (1)
1. based on power method photovoltaic transformation of electrical energy system noise source internal impedance extraction system; It is characterized in that, comprise direct current artificial mains network (DC-AMN), AC artificial electric power network (AC-AMN), spectrum analyzer, the host computer that possesses corresponding software, 50 Ω matched impedances, coupling capacitance, resistive load and equipment under test; The direct current that solar panels are produced is connected with tested transformation of electrical energy device through the direct current artificial mains network, uploads defeated potential high-frequency electromagnetic interference noise of coming in order to isolated sun power electroplax; The output terminal of transformation of electrical energy device is linked to each other with the tested interface of AC artificial electric power network; The power connector end mouth of AC artificial electric power network is connected with resistive load; When making test photovoltaic transformation of electrical energy system noise source internal impedance, equipment under test is in running order.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091558A (en) * | 2013-01-21 | 2013-05-08 | 南京师范大学 | Drawing circuit for resistance in photovoltaic grid-connected inverter direct current side noise source and method |
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2011
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091558A (en) * | 2013-01-21 | 2013-05-08 | 南京师范大学 | Drawing circuit for resistance in photovoltaic grid-connected inverter direct current side noise source and method |
| CN103091558B (en) * | 2013-01-21 | 2015-08-05 | 南京师范大学 | The extraction circuit of photovoltaic combining inverter direct current side noise source internal impedance and method |
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Granted publication date: 20120613 |