CN102393482B - Grid-connected inverter and circuit for detecting island thereof - Google Patents
Grid-connected inverter and circuit for detecting island thereof Download PDFInfo
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Abstract
The invention discloses a grid-connected inverter and a circuit for detecting an island thereof. A sampling circuit and a comparator acquire the voltage of a power grid, and the acquired voltage is analyzed by two comparators; after signal processing, the fluctuation condition of the power grid can be effectively monitored by monitoring the level fluctuation of two output ends OUT1 and OUT2. When the power grid normally works, the output of the output end OUT1 is high and the output of the output end OUT2 is low; when the voltage of the power grid suddenly rises due to a failure of the power grid, the output of the output end OUT1 is low and the output end OUT2 is kept unchanged at low level; and when the voltage of the power grid suddenly drops, the output of the output end OUT2 is high and the output end OUT1 is kept unchanged at high output. A microprogrammed control unit (MCU) of a system adopts a certain algorithm in the process of monitoring the OUT1 and the OUT2 to prevent error detection caused by interference on the power grid. The detection circuit can effectively monitor the voltage of the power grid to prevent islanding.
Description
Technical field
The present invention relates to power domain, in particular a kind of combining inverter and isolated island testing circuit thereof.
Background technology
Island effect refers to combining inverter to mains supply the time, and because of reason interruption of power supply such as electric fault, maloperation or spontaneous combustion factors, but at this moment combining inverter still can continue to electrical network to carry a certain proportion of electric energy, thereby the isolated island phenomenon occurs.Island effect can bring serious hidden danger to equipment and personnel's safety.Behind the electrical network interruption of power supply, when the maintainer overhauls the power circuit of electrical network and power equipment, if combining inverter continues the accident that power supply can cause casualties; If combining inverter continues power supply, in case the power system restoration power supply, may there be bigger difference in the output voltage of electrical network and combining inverter and phase place, can produce very big dash current in a flash, and damage equipment.So behind grid power blackout, must stop grid-connected photovoltaic system at once to the power supply of electrical network.
Combining inverter generally can adopt dual mode passive and initiatively to protect with at this effect.Passive type protection generally refers to: when the electrical network interruption of power supply, can produce skip signal at amplitude, frequency and the phase parameter of line voltage, judge whether dead electricity of electrical network by detecting skip signal.Active protection generally refers to: electrical network parameter is sent little undesired signal, judge whether dead electricity of electrical network by detecting feedback signal, after combining inverter detects the electrical network interruption of power supply, can quit work immediately, the present anti-isolated island technology of parallel network reverse, each company all captures.
The photovoltaic combining inverter standard of the current international practice has all been done requirement to combining inverter isolated island measuring ability, and wherein IEEE Std2000-929 regulation is when the frequency of common point is outside 59.3-60.5Hz, and combining inverter should be stopped power supply in 6 cycles.Common combining inverter is because capacity is little; characteristics such as cost height; generally can not communicate by letter with communication system of power grids control system; its isolated island detects and resist technology mainly is based on the self-examination (Local detection) of inverter but not telecommunication technique (Remote detection), and isolated island detects to study and is devoted to the isolated island measuring ability is integrated in the inverter control system at present.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide a kind of combining inverter and isolated island testing circuit thereof, be intended to solve when detecting combining inverter to mains supply accurately the island effect that the outage back occurs.
Technical scheme of the present invention is as follows:
A kind of isolated island testing circuit of combining inverter, it comprises sample circuit, signal processing circuit and microprocessor that comparer is formed, described sample circuit, signal processing circuit is connected successively with microprocessor, described signal processing circuit comprises first resistance, second resistance, second amplifier, the 3rd amplifier, the one RC circuit, the 2nd RC circuit, the 3rd RC circuit and the 4th RC circuit, first resistance and second resistance are to the voltage dividing potential drop of sample circuit output terminal, and the voltage of sample circuit output terminal is linked into the positive input terminal of second amplifier and the negative input end of the 3rd amplifier through a RC circuit and the 2nd RC circuit correspondence respectively; Be linked into the negative input end of second amplifier and the positive input terminal of the 3rd amplifier through the 3rd RC circuit and the 4th RC circuit correspondence respectively through voltage after partial, the output terminal of second amplifier and the 3rd amplifier all is connected on the microprocessor.
The isolated island testing circuit of described combining inverter, wherein, described sample circuit comprises first collection terminal and second collection terminal, and is connected on second pin and the 3rd pin of first amplifier, is in series with a plurality of resistance between first collection terminal and second pin; Also be in series with a plurality of resistance between second collection terminal and the 3rd pin; The 3rd pin also connects 2.5V voltage by resistance; First pin of first amplifier is signal output, and described first pin also feeds back on second pin by resistance.
The isolated island testing circuit of described combining inverter, wherein, sample circuit attenuated input signal be peak-to-peak value less than the alternating voltage of 2.5V, and by external 2.5V power supply this AC signal is raised 2.5V.
The isolated island testing circuit of described combining inverter, wherein, first resistance and second resistance carry out dividing potential drop to output signal, the low 0.1V of the voltage after the dividing potential drop before the voltage ratio dividing potential drop.
A kind of combining inverter is characterized in that, is provided with above-mentioned isolated island testing circuit in the described combining inverter.
Beneficial effect of the present invention: the present invention gathers then line voltage by sample circuit and comparer and with two comparers the voltage that collects is carried out analyzing and processing.After the signal processing, change the fluctuation situation that can effectively monitor electrical network by the level of monitoring two output terminal OUT1, OUT2.If during the electrical network normal operation, output terminal OUT1 is output as height, output terminal OUT2 is output as low; Suddenly change when high when electric network power-fail causes line voltage, output terminal OUT1 output is low, and output terminal OUT2 keeps low level constant; If line voltage bust, output terminal OUT2 are exported high, output terminal OUT1 keeps inconvenience output high.The observation process of the OUT1 of the MCU of system, OUT2 also adds certain algorithm and prevents that some interference on the electrical network from causing flase drop to survey.This signal deteching circuit can effectively be monitored line voltage, thereby prevents the generation of isolated island phenomenon.
Description of drawings
Fig. 1 is the circuit theory diagrams of line voltage sample circuit provided by the invention.
Fig. 2 is the input voltage waveform of sample circuit.
Fig. 3 is the sample circuit output voltage waveforms.
Fig. 4 is the circuit theory diagrams of comparator signal treatment circuit provided by the invention.
Fig. 5 is the suddenly change voltage data oscillogram of comparer when high of line voltage.
Fig. 6 is the oscillogram of each point signal in the line voltage bust moment comparer.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, clear and definite, below develop simultaneously with reference to accompanying drawing that the present invention is described in more detail for embodiment.
The island effect major part causes the major network power down to form for reasons such as maloperation or spontaneous combustion factors.At the origin cause of formation we propose a kind of by the time real monitoring voltage ripple of power network method come the generation of pre-isolated island effect prevention.The major network power down will inevitably cause the fluctuation of line voltage, and the inverter output voltage that is connected in parallel on the electrical network also can be affected thereupon, moment or uprise or step-down.Designing a monitor catches and grabs this saltus step process and survey electrical network.
The monitor principle analysis: testing circuit comprises signal processing circuit and the microprocessor that sample circuit, comparer are formed.Sample circuit as shown in Figure 1.The input voltage of gathering from electrical network is the alternating current of 220V/50HZ, and input voltage waveform as shown in Figure 2.Sample circuit attenuated input signal be peak-to-peak value less than the alternating voltage of 2.5V, and this AC signal raised 2.5V.The waveform that output signal A is ordered as shown in Figure 3.Send into microprocessor after the signal processing circuit analyzing and processing of the signal of output through the comparer composition, described microprocessor detects the variation of input signal, and makes corresponding response according to different variation control systems.
Continuation is referring to Fig. 1, described sample circuit comprises two collection terminals, the first collection terminal 220AC-L and the second collection terminal 220AC-N, and be connected on second pin 2 and the 3rd pin 3 of the first amplifier UA, be in series with a plurality of resistance R between the first collection terminal 220AC-L and second pin 2; Also be in series with a plurality of resistance R between the second collection terminal 220AC-N and the 3rd pin 3.The 3rd pin also connects 2.5V voltage by resistance; First pin 1 of the first amplifier UA is signal output A point, and described first pin 1 also feeds back on second pin by resistance.
After collecting a little online voltage signal, the present invention adopts two comparers that the A point voltage that collects is carried out analyzing and processing.Be the comparator signal treatment circuit as Fig. 4, comprise first resistance R 1, second resistance R 2, the second amplifier A, the 3rd amplifier B, a RC circuit, the 2nd RC circuit, the 3rd RC circuit and the 4th RC circuit.The one RC circuit is made up of R3 and C1 and R5 and C2; The 3rd RC circuit is made up of R4 and C3 and R6 and C4; The 4th RC circuit is made up of R7 and C5 and R9 and C6; The 2nd RC circuit is made up of R8 and C7 and R10 and C8.The one RC circuit is identical with the 4th RC circuit, and the 2nd RC circuit is identical with the 3rd RC circuit, and the 2nd RC circuit is different with a RC circuit.Electric capacity all is the same in the present embodiment, and the resistance in resistance ratio the 2nd RC circuit in the RC circuit is big.
The circuit monitoring line voltage just is that two different amplifier input ends that cause of RC circuit parameter are different to the response time of voltage fluctuation, and the response time is T=R*C.The response time that the response time that C, E are ordered among the figure orders than D, F is slow.Line voltage is in stable operating state during the electrical network operate as normal, and the A point voltage is higher than B point voltage 0.1V, and in like manner the C point voltage is higher than D point voltage 0.1V, and the F point voltage is higher than E point voltage 0.1V.The second amplifier A exports high level, the 3rd amplifier B output low level.
When electric network power-fail, if the voltage instantaneous on the electrical network uprises, the voltage that A point and B are ordered uprises suddenly, for the second amplifier A: because the response time that the response time that the C point is ordered to A orders to B than the D point is slow, so the voltage that moment D is ordered raises, and the voltage that C is ordered is constant, has just caused the D point voltage than C point voltage height, causes second amplifier A upset by high step-down.In like manner, the response time that the response ratio F point that the E point is ordered to B among the 3rd amplifier B is ordered to A is slow, and the voltage that moment F is ordered raises, and the E point voltage is constant, and the F point voltage is still than E point voltage height, and the 3rd amplifier B still keeps output low level.
In like manner, when electric network power-fail, if the voltage instantaneous step-down on the electrical network, the voltage die that A point and B are ordered, for the 3rd amplifier B: since the low-response that the response ratio F point that E point is ordered to B is ordered to A, the voltage reduction that moment F is ordered, and the voltage that E is ordered remains unchanged, just cause the F point voltage to be lower than the E point voltage, the amplifier output switching activity is uprised by low.The output voltage of in like manner analyzing the second amplifier A remains unchanged and exports height.
So after handling through signal, the level of the output terminal OUT2 of output terminal OUT1, the 3rd amplifier B by monitoring the second amplifier A changes the fluctuation situation that can effectively monitor electrical network.If during the electrical network normal operation, the output terminal OUT1 of the second amplifier A is output as height, the output terminal OUT2 of the 3rd amplifier B is output as low.Suddenly change when high when electric network power-fail causes line voltage, second amplifier A upset output terminal OUT1 output is low, and the output terminal OUT2 of the 3rd amplifier B keeps low level constant.
If the line voltage bust, the output terminal OUT2 upset of the 3rd amplifier B, output is high; The output terminal OUT1 of the second amplifier A remains unchanged, and output is high.The microprocessor MCU of system also should add certain algorithm to the observation process of the output terminal OUT2 of output terminal OUT1, the 3rd amplifier B of the second amplifier A and prevent that some interference on the electrical network from causing flase drop to survey.
Fig. 5,6 is for simulated experiment result's data waveform figure.Analysis of experimental data: be the high voltage data oscillogram of line voltage sudden change as Fig. 5.Sinusoidal waveform is the voltage that A is ordered among Fig. 5, and corresponding C, D, OUT1 point voltage oscillogram.The voltage power down causes the line voltage sudden change high, sudden change causes that D point voltage response is very fast, T1 to T2 in the time voltage be higher than the C point, cause amplifier to be overturn, the output terminal OUT1 of the second amplifier A produces a negative pulse in the meantime, and the output terminal OUT2 of this process the 3rd amplifier B keeps output end level.System catches and catches response is done in this saltus step with regard to reporting system processing.
Fig. 6 causes the line voltage bust voltage data oscillogram of moment for electric network power-fail.Sinusoidal waveform is the voltage that A is ordered among the figure, and corresponding constantly E, F, the oscillogram of OUT2 each point signal with the A point.Power down moment, the reaction time difference of the first positive input terminal E of the 3rd amplifier B and the voltage jump of the first negative input end F causes T1 to be higher than the E point voltage to F point voltage between T2, cause the 3rd amplifier B upset, the output terminal OUT2 of the 3rd amplifier B exports a high impulse during this period of time, the output terminal OUT1 of this process second amplifier A keeps high level.System detects this saltus step and judges electric network power-fail, and reporting system is done the processing of response.
Experimental result shows that this signal deteching circuit can effectively monitor line voltage, thereby prevents the generation of isolated island phenomenon.
Should be understood that application of the present invention is not limited to above-mentioned giving an example, for those of ordinary skills, can be improved according to the above description or conversion that all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (5)
1. the isolated island testing circuit of a combining inverter, it is characterized in that, comprise sample circuit, signal processing circuit and microprocessor, described sample circuit, signal processing circuit is connected successively with microprocessor, described signal processing circuit comprises first resistance, second resistance, second amplifier, the 3rd amplifier, the one RC circuit, the 2nd RC circuit, the 3rd RC circuit and the 4th RC circuit, first resistance and second resistance are to the voltage dividing potential drop of sample circuit output terminal, and the voltage of sample circuit output terminal is linked into the positive input terminal of second amplifier and the negative input end of the 3rd amplifier through a RC circuit and the 2nd RC circuit correspondence respectively; Be linked into the negative input end of second amplifier and the positive input terminal of the 3rd amplifier through the 3rd RC circuit and the 4th RC circuit correspondence respectively through voltage after partial, the output terminal of second amplifier and the 3rd amplifier all is connected on the microprocessor;
The RC circuit parameter of second amplifier and the 3rd amplifier positive and negative input end separately is different, cause second amplifier and the 3rd amplifier positive and negative input end separately different to the response time of voltage fluctuation, response time is T=R*C, and wherein R represents resistance, and C represents electric capacity.
2. the isolated island testing circuit of combining inverter according to claim 1, it is characterized in that, described sample circuit comprises first collection terminal and second collection terminal, and is connected on second pin and the 3rd pin of first amplifier, is in series with a plurality of resistance between first collection terminal and second pin; Also be in series with a plurality of resistance between second collection terminal and the 3rd pin; The 3rd pin also connects 2.5V voltage by resistance; First pin of first amplifier is signal output, and described first pin also feeds back on second pin by resistance.
3. the isolated island testing circuit of combining inverter according to claim 1 is characterized in that, sample circuit attenuated input signal be peak-to-peak value less than the alternating voltage of 2.5V, and by external 2.5V power supply this AC signal is raised 2.5V.
4. the isolated island testing circuit of combining inverter according to claim 1 is characterized in that, first resistance and second resistance carry out dividing potential drop to the voltage of sample circuit output terminal, the low 0.1V of the voltage after the dividing potential drop before the voltage ratio dividing potential drop.
5. a combining inverter is characterized in that, is provided with any described isolated island testing circuit in the claim 1 to 4 in the described combining inverter.
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| CN 201110306511 CN102393482B (en) | 2011-10-11 | 2011-10-11 | Grid-connected inverter and circuit for detecting island thereof |
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| US9065323B2 (en) * | 2013-03-04 | 2015-06-23 | Astec International Limited | Systems and methods for detecting islanding conditions in grid-tied inverters |
| CN103308806B (en) * | 2013-06-18 | 2015-07-08 | 江苏大学 | Islanding detection method based on fundamental frequency and switching-frequency sub-impedance |
| CN110045177B (en) * | 2019-04-23 | 2021-03-30 | 深圳市博实结科技有限公司 | Power failure state detection method and power failure state detection system |
| CN110456214A (en) * | 2019-07-22 | 2019-11-15 | 华羿微电子股份有限公司 | A kind of alone island detection system and its method |
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| US5121067A (en) * | 1987-10-06 | 1992-06-09 | Board Of Regents Of Leland Stanford University | Directional sampling bridge |
| CN101059555A (en) * | 2006-04-17 | 2007-10-24 | 盈正豫顺电子股份有限公司 | Distribution type electric power system island movement detection device and its method |
| CN101975893A (en) * | 2010-10-20 | 2011-02-16 | 沈阳工业大学 | Differential capacitance detection circuit based on instrument amplifier and detection method thereof |
| CN102005742A (en) * | 2010-11-17 | 2011-04-06 | 中国电力科学研究院 | Distributed power generation island detection system and method based on power frequency carrier wave |
| CN202267705U (en) * | 2011-10-11 | 2012-06-06 | 深圳市京泉华电子有限公司 | Grid-connected inverter and island detection circuit thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121067A (en) * | 1987-10-06 | 1992-06-09 | Board Of Regents Of Leland Stanford University | Directional sampling bridge |
| CN101059555A (en) * | 2006-04-17 | 2007-10-24 | 盈正豫顺电子股份有限公司 | Distribution type electric power system island movement detection device and its method |
| CN101975893A (en) * | 2010-10-20 | 2011-02-16 | 沈阳工业大学 | Differential capacitance detection circuit based on instrument amplifier and detection method thereof |
| CN102005742A (en) * | 2010-11-17 | 2011-04-06 | 中国电力科学研究院 | Distributed power generation island detection system and method based on power frequency carrier wave |
| CN202267705U (en) * | 2011-10-11 | 2012-06-06 | 深圳市京泉华电子有限公司 | Grid-connected inverter and island detection circuit thereof |
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