CN103036248A - Photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and control method - Google Patents
Photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and control method Download PDFInfo
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- CN103036248A CN103036248A CN2011103036035A CN201110303603A CN103036248A CN 103036248 A CN103036248 A CN 103036248A CN 2011103036035 A CN2011103036035 A CN 2011103036035A CN 201110303603 A CN201110303603 A CN 201110303603A CN 103036248 A CN103036248 A CN 103036248A
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- direct component
- electric current
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and a control method and relates to the control field of distributed generation grid-connected equipment. The photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit comprises a five-stage low-pass filter (1), a amplifying circuit (2), a filtering and level clamping circuit (3), a level biasing circuit (4) and a operational amplifier (U13). The five-stage low-pass filter (1) is connected with three feet of the operational amplifier (U13). Six feet of the operational amplifier (U13) are connected with the amplifying circuit (2). The amplifying circuit (2), the level biasing circuit (4) and the filtering and level clamping circuit (3) are sequentially connected with each other. The photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and the control method has the advantages of being capable of achieving accurate detection of direct component through a hardware circuit, solving the problems at low cost and improving control accuracy.
Description
Technical field
The present invention relates to distributed power generation grid-connection device control field, relate in particular to photovoltaic combining inverter grid-connected current dc component detection circuit and control method.
Background technology
The exploitation of new forms of energy receives the concern of society day by day, and also puts into effect successively for distributed power generation grid-connection device relevant criterion; Wherein DC component is one clear and definite index; Britain's regulation is comparatively strict, limit DC component to be＜20mA, and other countries also stipulate＜5 ‰.Addressed this problem now several method:
1) adds power frequency isolating transformer isolated DC component at the inverter outlet side; The method increase cost and weight, equally also must face the problem of transformer bias;
2) extract DC component by software DFT conversion, cooperating control method to suppress DC component; The method software amount of calculation is large, and precision is low;
3) extract DC component and control by the software low-pass filtering; The method control weak effect.
The crucial difficult point of the control of DC component is being detected, only having to detect accurately and just can accurately control (inhibition) DC component.
Summary of the invention
The purpose of this invention is to provide photovoltaic combining inverter grid-connected current dc component detection circuit and control method, it can realize that accurate DC component detects by hardware circuit, has solved this problem with lower cost, has improved again control precision.
In order to solve the existing problem of background technology, the present invention is by the following technical solutions: it comprises five rank low pass filters 1, amplifying circuit 2, filtering and clamping circuit 3, level biasing circuit 4 and operational amplifier U13, five rank low pass filters 1 link to each other with 3 pin of operational amplifier U13,6 pin of operational amplifier U13 link to each other with amplifying circuit 2, and amplifying circuit 2, level biasing circuit 4 and filtering link to each other successively with clamping circuit 3.
The DC quantity extraction process in the alternating current, 2 pairs of prime small-signals of amplifying circuit amplify by five rank low pass filters 1 in the present invention; Level biasing circuit 4 can normally sample CPU to enter the signal of CPU be positive signal; Filtering and clamping circuit 3 are so that signal carries out a simple filtering and clamping before entering CPU.
The present invention can realize that accurate DC component detects by hardware circuit, has solved this problem with lower cost, has improved again control precision.
Description of drawings:
Fig. 1 is dc component detection circuit schematic diagram of the present invention;
Fig. 2 is that DC component of the present invention detects control principle drawing;
Fig. 3 is the circuit diagram of embodiment 1.
Embodiment:
With reference to Fig. 1-2, this embodiment is by the following technical solutions: it comprises five rank low pass filters 1, amplifying circuit 2, filtering and clamping circuit 3, level biasing circuit 4 and operational amplifier U13, five rank low pass filters 1 link to each other with 3 pin of operational amplifier U13,6 pin of operational amplifier U13 link to each other with amplifying circuit 2, and amplifying circuit 2, level biasing circuit 4 and filtering link to each other successively with clamping circuit 3.
The DC quantity extraction process in the alternating current, 2 pairs of prime small-signals of amplifying circuit amplify this embodiment by five rank low pass filters 1; Level biasing circuit 4 can normally sample CPU to enter the signal of CPU be positive signal; Filtering and clamping circuit 3 are so that signal carries out a simple filtering and clamping before entering CPU.
The DC component of this embodiment detects control principle: the current sensor output signal is divided two-way, the normal modulate circuit of one road alternating current, one the tunnel is that DC component is extracted circuit (such as Fig. 1), and with ac current signal, two groups of analog signals of DC component signal are sent into the CPU sampling.
This embodiment is extracted DC component by low pass filter, then use closed-loop control that DC component is carried out dynamic adjustments, with the compensation rate of adjuster Output rusults as current sampling data, the compensation rate AC sampling value that is added to, use as the feedback quantity of control; Whole control procedure is exactly to DC component offset of current feedback value stack, and does not affect other any amount and strategies in the original control.Therefore can process the control of DC component as a separate modular on software, (5 among Fig. 2 is the alternating current transducer to simplify Software for Design; 6 pairs of DC component are done a closed-loop control, realize the dynamic adjustment to DC component; 7 adjust the result with the DC component closed loop controls as the compensation rate of alternating current, the alternating current after 8 expressions compensate sampling).
The present invention can realize that accurate DC component detects by hardware circuit, has solved this problem with lower cost, has improved again control precision.
Embodiment 1: with reference to Fig. 3, and the cut-off frequency of low pass filter wherein
The set basis actual needs of cut-off frequency is set, and specifically adjusts RC and gets final product.Exporting first-harmonic for combining inverter is 50Hz or 60Hz, so filter cutoff frequency is set in, and 10Hz is following just can well to have extracted DC component.
Claims (1)
1. photovoltaic combining inverter grid-connected current dc component detection circuit and control method, it is characterized in that it comprises five rank low pass filters (1), amplifying circuit (2), filtering and clamping circuit (3), level biasing circuit (4) and operational amplifier (U13), five rank low pass filters (1) link to each other with 3 pin of operational amplifier (U13), 6 pin of operational amplifier (U13) link to each other with amplifying circuit (2), amplifying circuit (2), level biasing circuit (4) links to each other with clamping circuit (3) successively with filtering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103036035A CN103036248A (en) | 2011-10-10 | 2011-10-10 | Photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103036035A CN103036248A (en) | 2011-10-10 | 2011-10-10 | Photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and control method |
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| Publication Number | Publication Date |
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| CN103036248A true CN103036248A (en) | 2013-04-10 |
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| CN2011103036035A Pending CN103036248A (en) | 2011-10-10 | 2011-10-10 | Photovoltaic grid-connected inverter grid-connected electric current direct component detection circuit and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569551A (en) * | 2015-01-08 | 2015-04-29 | 漳州科华技术有限责任公司 | DC component detecting method applied to inversion voltages |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09138246A (en) * | 1995-11-16 | 1997-05-27 | Sanyo Electric Co Ltd | Dc-component detection apparatus |
| CN101672760A (en) * | 2009-09-29 | 2010-03-17 | 杭州绿洁水务科技有限公司 | Detection device of water flow tube |
| 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 |
-
2011
- 2011-10-10 CN CN2011103036035A patent/CN103036248A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09138246A (en) * | 1995-11-16 | 1997-05-27 | Sanyo Electric Co Ltd | Dc-component detection apparatus |
| CN101672760A (en) * | 2009-09-29 | 2010-03-17 | 杭州绿洁水务科技有限公司 | Detection device of water flow tube |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 陈良亮等: "逆变器输出电压中直流分量检测与数字调节方法", 《数据采集与处理》, vol. 18, no. 1, 31 March 2003 (2003-03-31) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569551A (en) * | 2015-01-08 | 2015-04-29 | 漳州科华技术有限责任公司 | DC component detecting method applied to inversion voltages |
| CN104569551B (en) * | 2015-01-08 | 2016-03-23 | 漳州科华技术有限责任公司 | A kind of DC component detection method being applied to inverter voltage |
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Application publication date: 20130410 |