CN105388429A - Grid-connected inverter detection and control circuit - Google Patents
Grid-connected inverter detection and control circuit Download PDFInfo
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- CN105388429A CN105388429A CN201510919199.2A CN201510919199A CN105388429A CN 105388429 A CN105388429 A CN 105388429A CN 201510919199 A CN201510919199 A CN 201510919199A CN 105388429 A CN105388429 A CN 105388429A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a grid-connected inverter detection and control circuit. The grid-connected inverter detection and control circuit comprises a sampling resistor unit and a direct current component extraction, detection and control unit, wherein the sampling resistor unit is connected in series in an inverter alternating current output side circuit, the sampling resistor unit is connected with the direct current component extraction, detection and control unit, and the direct current component extraction, detection and control unit is connected with an inverter inversion circuit; the grid-connected inverter detection and control circuit comprises a circuit breaker which controls the switching off and switching on of the alternating current output side circuit; and the switching off and switching on of the circuit breaker are controlled through the direct current component extraction, detection and control unit. According to the grid-connected inverter detection and control circuit of the invention, the circuit breaker is adopted; when detecting un-adjustable abnormal signals, the direct current component extraction, detection and control unit can control and make the circuit breaker switched off, so that the circuit can stop working.
Description
Technical field
the present invention relates to a kind of combining inverter Detection & Controling circuit.
Background technology
along with the reduction of cost, the use of parallel network power generation is more and more extensive.And in photovoltaic combining inverter, having a very important index: DC current exports content (DCI), is strict with.The DCI standard of country variant laws and regulations requirement is also different, and such as G83 regulation DCI is less than 20mA, and AS4777 requires that DCI is less than 5 ‰, DK5940 of output current and requires to be less than 5 ‰ of output current.
usual combining inverter can control DCI preferably, but then cannot ensure DCI when combining inverter breaks down time.
Summary of the invention
the object of this invention is to provide a kind of safe and reliable combining inverter Detection & Controling circuit.
for achieving the above object, the technical solution used in the present invention is: combining inverter Detection & Controling circuit, comprises sampling resistor unit, DC component extracts detection and control unit; Described sampling resistor units in series is in inverter ac outgoing side circuit, sampling resistor unit connects DC component and extracts detection and control unit, DC component is extracted detection and control unit and is connected inverter inverter circuit, it also comprises the isolating switch controlling described interchange outgoing side circuit and disconnect and close, and described isolating switch extracts the disconnection of isolating switch described in detection and control unit controls by DC component and closes.
preferably, described sampling resistor unit is be connected on sampling resistor in inverter outgoing side circuit or equivalent series resistance.
preferably, described DC component extraction detection and control unit comprises the DC component extraction and signal processing unit, buffer circuit unit, control circuit that connect successively.
further preferably, described DC component extract to comprise with signal processing unit extract DC component for removing alternating component in inverter output current filter unit, the DC component after filter unit process is carried out amplifying the signal magnification processing processed, described filter unit connection signal magnification processing.
further preferably, described sampling resistor unit connects filter unit.
further preferably, described signal magnification processing connects buffer circuit unit.
further preferably, described control circuit is comprised and judging to regulate the judging unit of direction and amplitude for being extracted by DC component to the DC content that signal processing unit feeds back, making corresponding PWM and drive to adjust and make the standard compliant PWM of the DC content of output current drive adjustment unit, described judging unit connection PWM driving adjustment unit.
further preferably, described judging unit connects described isolating switch.
further preferably, described buffer circuit unit connection judgment unit.
further preferably, described PWM drives adjustment unit to connect inverter inverter circuit.
because technique scheme is used, the present invention compared with prior art has following advantages:
owing to invention increases isolating switch, DC component is extracted detection and control unit inspection and is disconnected to controlling isolating switch when the abnormal signal that cannot regulate, the work of halt circuit.
Accompanying drawing explanation
accompanying drawing 1 is schematic diagram of the present invention.
in above accompanying drawing: 1, sampling resistor unit; 10, DC component is extracted and signal processing unit; 11, filter unit; 12, signal magnification processing; 2, DC component extracts detection and control unit; 20, buffer circuit unit; 30, control circuit; 31, judging unit; 32, PWM drives adjustment unit; 4, isolating switch; 5, inverter circuit; 6, civil power.
Embodiment
below in conjunction with embodiment shown in the drawings, the invention will be further described:
embodiment one: shown in accompanying drawing 1, as shown in Figure 1, a kind of combining inverter outgoing side DC content Detection & Controling circuit, it comprises sampling resistor unit 1, DC component extracts detection and control unit 2, isolating switch 4.
sampling resistor unit 1 is for being connected on sampling resistor in inverter outgoing side circuit or equivalent series resistance.
dC component is extracted detection and control unit 2 and is comprised the DC component extraction and signal processing unit 10, buffer circuit unit 20, control circuit 30 that connect successively.
isolating switch 4 controls to exchange outgoing side circuit and disconnects and close.
dC component extract with signal processing unit 10 comprise extract DC component for removing alternating component in inverter output current filter unit 11, carry out amplifying the signal magnification processing 12 processed to the DC component after filter unit 11 processes.
control circuit 30 is comprised and judging to regulate the judging unit 31 of direction and amplitude for being extracted by DC component to the DC content that signal processing unit 10 feeds back, making corresponding PWM and drive to adjust and make the standard compliant PWM of the DC content of output current drive adjustment unit 32.
described sampling resistor unit 1 is connected in inverter ac outgoing side circuit, sampling resistor unit 1 connects filter unit 11, filter unit 11 connection signal magnification processing 12, signal magnification processing 12 connects buffer circuit unit 20, buffer circuit unit 20 connection judgment unit 31, judging unit 31 connects PWM and drives adjustment unit 32, PWM to drive adjustment unit 32 to connect inverter inverter circuit, judging unit 31 connecting breaker 4.
during use, the interchange AC composition of inverter output current and direct current DC composition are all delivered to DC component and are extracted and signal processing unit 10 by sampling resistor unit 1, after removing interchange AC current component wherein, only direct current DC current component is wherein delivered to buffer circuit 20 through amplifying process, DC current signal feeds back to control circuit 30 after buffer circuit 20, control circuit 30 passes through, judge the direction and the amplitude of accommodation that need adjustment, make corresponding PWM and drive adjustment, make the DC current of output current export content DCI and meet regulation required standard.If control circuit 30 detects that the direct current DC current value fed back is not in specialized range for a long time, then control isolating switch 4 and disconnect.
above-described embodiment, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences done according to Spirit Essence of the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (10)
1. combining inverter Detection & Controling circuit, comprises sampling resistor unit (1), DC component extracts detection and control unit (2); Described sampling resistor unit (1) is connected in inverter ac outgoing side circuit, sampling resistor unit (1) connects DC component and extracts detection and control unit (2), DC component is extracted detection and control unit (2) and is connected inverter inverter circuit, it is characterized in that: it also comprises the isolating switch (4) controlling described interchange outgoing side circuit and disconnect and close, described isolating switch extracts detection and control unit (2) by DC component and controls the disconnection of described isolating switch (4) and close.
2. combining inverter Detection & Controling circuit according to claim 1, is characterized in that: described sampling resistor unit (1) is for being connected on sampling resistor in inverter outgoing side circuit or equivalent series resistance.
3. combining inverter Detection & Controling circuit according to claim 1, is characterized in that: described DC component is extracted detection and control unit (2) and comprised the DC component extraction and signal processing unit (10), buffer circuit unit (20), control circuit (30) that connect successively.
4. combining inverter Detection & Controling circuit according to claim 3, it is characterized in that: described DC component extract to comprise with signal processing unit (10) extract DC component for removing alternating component in inverter output current filter unit (11), the DC component after filter unit (11) processes is carried out amplifying the signal magnification processing (12) processed, described filter unit (11) connection signal magnification processing (12).
5. combining inverter Detection & Controling circuit according to claim 4, is characterized in that: described sampling resistor unit (1) connects filter unit (11).
6. combining inverter Detection & Controling circuit according to claim 4, is characterized in that: described signal magnification processing (12) connects buffer circuit unit (20).
7. combining inverter Detection & Controling circuit according to claim 3, it is characterized in that: described control circuit (30) is comprised and judges to regulate the judging unit of direction and amplitude (31) for being extracted the DC content fed back with signal processing unit (10) by DC component, makes corresponding PWM and drive to adjust and make the standard compliant PWM of the DC content of output current drive adjustment unit (32), described judging unit (31) connection PWM driving adjustment unit (32).
8. combining inverter Detection & Controling circuit according to claim 7, is characterized in that: described judging unit (31) connects described isolating switch (4).
9. combining inverter Detection & Controling circuit according to claim 7, is characterized in that: described buffer circuit unit (20) connection judgment unit (31).
10. combining inverter Detection & Controling circuit according to claim 7, is characterized in that: described PWM drives adjustment unit (32) to connect inverter inverter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510919199.2A CN105388429A (en) | 2015-12-10 | 2015-12-10 | Grid-connected inverter detection and control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510919199.2A CN105388429A (en) | 2015-12-10 | 2015-12-10 | Grid-connected inverter detection and control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105388429A true CN105388429A (en) | 2016-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510919199.2A Pending CN105388429A (en) | 2015-12-10 | 2015-12-10 | Grid-connected inverter detection and control circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951180A (en) * | 2010-08-31 | 2011-01-19 | 江苏艾索新能源股份有限公司 | DC content detection and control circuit for output side of synchronized inverter |
| CN202798016U (en) * | 2012-09-25 | 2013-03-13 | 广东易事特电源股份有限公司 | Grid connection current direct component control system |
| CN103323711A (en) * | 2013-06-09 | 2013-09-25 | 东北大学 | Low voltage grid-connected detection device and method of distributed new energy power generation system |
| CN104079193A (en) * | 2014-06-27 | 2014-10-01 | 江苏兆伏新能源有限公司 | Device for direct current component adjustment and control method thereof |
-
2015
- 2015-12-10 CN CN201510919199.2A patent/CN105388429A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951180A (en) * | 2010-08-31 | 2011-01-19 | 江苏艾索新能源股份有限公司 | DC content detection and control circuit for output side of synchronized inverter |
| CN202798016U (en) * | 2012-09-25 | 2013-03-13 | 广东易事特电源股份有限公司 | Grid connection current direct component control system |
| CN103323711A (en) * | 2013-06-09 | 2013-09-25 | 东北大学 | Low voltage grid-connected detection device and method of distributed new energy power generation system |
| CN104079193A (en) * | 2014-06-27 | 2014-10-01 | 江苏兆伏新能源有限公司 | Device for direct current component adjustment and control method thereof |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 212200 Yangzhong City, Jiangsu Province Economic Development Zone, Hong Xing Road, No. 588, No. Applicant after: Aisima new energy technology (Yangzhong) Co., Ltd. Address before: 212200 Yangzhong City, Jiangsu Province Economic Development Zone, Hong Xing Road, No. 588, No. Applicant before: Jiangsu Zof New Energy Co., Ltd. |
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| CB02 | Change of applicant information | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160309 |
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| RJ01 | Rejection of invention patent application after publication |