CN106300434A - LC type inverter filtering electric capacity is without soft control method of impact - Google Patents
LC type inverter filtering electric capacity is without soft control method of impact Download PDFInfo
- Publication number
- CN106300434A CN106300434A CN201610777376.2A CN201610777376A CN106300434A CN 106300434 A CN106300434 A CN 106300434A CN 201610777376 A CN201610777376 A CN 201610777376A CN 106300434 A CN106300434 A CN 106300434A
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- electric capacity
- switch
- inverter
- inductance
- electrical network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention belongs to photovoltaic apparatus field, particularly to a kind of LC type inverter filtering electric capacity without soft control method of impact.It includes inverter and electrical network, the outfan of inverter connects inductance, the other end of inductance is connected with electrical network, also include an electric capacity, one end of electric capacity is connected with the other end of inductance, the other end of electric capacity is connected with electrical network, it is provided with control circuit between the other end and the electrical network of described inductance, control circuit includes the second switch that is connected between the inductance other end and electrical network and the first switch module connected in parallel, first switch module includes the resistance of the first switch and series connection with it, the resistance of resistance is 0.3 ± 0.05 Ω, control method is as follows: step 1, first switch and second switch disconnect, and inverter is in off-network pattern, inverter charges to electric capacity, and make the voltage voltage equal to electrical network of electric capacity and inductance connection end；Step 2, Guan Bi the first switch, step 3, stop the off-network pattern of inverter, and close second switch.
Description
Technical field
The invention belongs to photovoltaic apparatus field, particularly to a kind of LC type inverter filtering electric capacity without soft controlling party of impact
Method.
Background technology
Inverter needs to close switch S2 when grid-connected so that inverter is connected with electrical network.But owing to electric capacity (C1) has
There is firm charging transient to be equivalent to the characteristic of short circuit, so directly can not be closed by S2 when grid-connected, the biggest rushing can be caused like that
Hit electric current, repeatedly may cause capacitance damage after Guan Bi.
The most domestic conventional control methods is first to close S1, allows line voltage (Vg) be filled to electric capacity C1 by resistance R1
Electricity, the now voltage on C1After C1 charges electricity, the voltage difference of Vc and Vg will subtract
Little, being so closed again S2 dash current will reduce.By the formula of Vc, R1 is the least, and Vc is the biggest, will be closer to Vg electricity
Pressure, S2 Guan Bi moment impact electric current will be the least.But so can there is a problem the biggest, S1 closes moment, electric capacity C1 phase
When in short circuit, flow through the transient current on R1 and C1If R1 is the least, S1 Guan Bi immediate current will be the biggest；If R1
Relatively big, S2 Guan Bi immediate current will be the biggest.So the resistance of R1 is difficult to choose.In particular with the increase of Vg, the most more it is difficult to ensure
Card dash current is in the allowed band of electric capacity or resistance.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, the present invention by change inverter and switch existing startup order, with
And the duty of inverter, it is achieved that the non-impacting start of LC type inverter filtering electric capacity.
The present invention is achieved through the following technical solutions:
LC type inverter filtering electric capacity is without soft control method of impact, including inverter and electrical network, the outfan of inverter
Connecting and have inductance, the other end of inductance is connected with electrical network, also includes that an electric capacity, one end of electric capacity connect with the other end of inductance
Connecing, the other end of electric capacity is connected with electrical network, is provided with control circuit, described control between the other end and the electrical network of described inductance
Circuit processed includes the second switch that is connected between the inductance other end and electrical network and the first switch module connected in parallel, first
Switch module includes the resistance of the first switch and series connection with it, it is characterised in that: the resistance of resistance is described in 0.3 ± 0.05 Ω
Control method as follows:
Step 1, the first switch and second switch disconnect, and inverter is in off-network pattern, and inverter charges to electric capacity, and
Make the voltage voltage equal to electrical network of electric capacity and inductance connection end；
Step 2, Guan Bi the first switch,
Step 3, stops the off-network pattern of inverter, and closes second switch.
In sum, the method have the advantages that
The present invention is by changing the duty of inverter, and the boot sequence of associated component, it is achieved that LC type inversion
Device filter capacitor non-impacting start, is protected relevant device, solves the service life that excessive rush of current causes short
Problem, be also convenient for designer to select suitable resistance and electric capacity simultaneously, reduce the design difficulty of product.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of the present invention；
In figure, 1 is inverter, and 2 is inductance, and 3 is the first switch, and 4 is resistance, and 5 is electrical network, and 6 is second switch, and 7 is electricity
Hold.
Detailed description of the invention
The present invention will be further described below in conjunction with the accompanying drawings.
As it is shown in figure 1, LC type inverter filtering electric capacity is without soft control method of impact, including inverter 1 and electrical network 5, inverse
The outfan connection becoming device 1 has inductance 2, the other end of inductance 2 to be connected with electrical network 5, also includes an electric capacity 7, one end of electric capacity 7
Being connected with the other end of inductance 2, the other end of electric capacity 7 is connected with electrical network 5, sets between the other end and the electrical network of described inductance 2
Be equipped with control circuit, described control circuit include the second switch 6 that is connected between inductance 2 other end and electrical network 5 and with
First switch module of its parallel connection, the first switch module includes the resistance 4 of the first switch 3 and series connection with it, the resistance of resistance 4
Being 0.3 ± 0.05 Ω, described control method is as follows:
Step 1, the first switch 3 and second switch 6 disconnect, and inverter 1 is in off-network pattern, and inverter 1 fills to electric capacity
Electricity, and make the voltage voltage equal to electrical network of electric capacity 7 and inductance connection end；
Step 2, Guan Bi the first switch, owing to the resistance of resistance 4 is less, and the voltage of electric capacity 7 and inductance connection end is equal to
The voltage of electrical network；Therefore there is no dash current；
Step 3, stops the off-network pattern of inverter, and closes second switch, now, when step 2 closes, and electric capacity and electricity
Sense connects the voltage of end and has certain decline, and owing to the resistance of resistance 4 is the least, electric capacity and the voltage of inductance connection end still can be near
Approximately equal to the voltage of electrical network, does not has dash current substantially.
In sum, the method have the advantages that
The present invention is by changing the duty of inverter, and the boot sequence of associated component, it is achieved that LC type inversion
Device filter capacitor non-impacting start, is protected relevant device, solves the service life that excessive rush of current causes short
Problem, be also convenient for designer to select suitable resistance and electric capacity simultaneously, reduce the design difficulty of product.
Claims (1)
1.LC type inverter filtering electric capacity is without soft control method of impact, and including inverter and electrical network, the outfan of inverter is even
Being connected to inductance, the other end of inductance is connected with electrical network, also includes an electric capacity, and one end of electric capacity is connected with the other end of inductance,
The other end of electric capacity is connected with electrical network, is provided with control circuit, described control between the other end and the electrical network of described inductance
Circuit includes the second switch that is connected between the inductance other end and electrical network and the first switch module connected in parallel, and first opens
Close assembly and include the resistance of the first switch and series connection with it, it is characterised in that: the resistance of resistance is 0.3 ± 0.05 Ω, controls
Method is as follows:
Step 1, the first switch and second switch disconnect, and inverter is in off-network pattern, and inverter charges to electric capacity, and makes electricity
Hold the voltage equal to electrical network of the voltage with inductance connection end；
Step 2, Guan Bi the first switch,
Step 3, stops the off-network pattern of inverter, and closes second switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610777376.2A CN106300434A (en) | 2016-08-31 | 2016-08-31 | LC type inverter filtering electric capacity is without soft control method of impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610777376.2A CN106300434A (en) | 2016-08-31 | 2016-08-31 | LC type inverter filtering electric capacity is without soft control method of impact |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106300434A true CN106300434A (en) | 2017-01-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610777376.2A Pending CN106300434A (en) | 2016-08-31 | 2016-08-31 | LC type inverter filtering electric capacity is without soft control method of impact |
Country Status (1)
| Country | Link |
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| CN (1) | CN106300434A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263502A (en) * | 2010-10-21 | 2011-11-30 | 江苏大全凯帆电器股份有限公司 | High-power wind power converter energy storage capacitor charging circuit |
| CN102521457A (en) * | 2011-12-15 | 2012-06-27 | 国网电力科学研究院 | Laplace transform based design method for flexible direct-current starting resistance |
| CN103259282A (en) * | 2013-04-08 | 2013-08-21 | 许继集团有限公司 | Soft cut-in method for non-isolated type photovoltaic grid-connected inverter and isolated type photovoltaic grid-connected inverter |
| CN103647442A (en) * | 2013-12-13 | 2014-03-19 | 北京天诚同创电气有限公司 | Pre-charging loop and power generating system |
| US20140139015A1 (en) * | 2012-11-19 | 2014-05-22 | Richard A. Poisson | Discrete input circuit |
| CN203747661U (en) * | 2014-03-24 | 2014-07-30 | 北京天诚同创电气有限公司 | Pre-charge device of wind power current transformer and wind power current transformer |
-
2016
- 2016-08-31 CN CN201610777376.2A patent/CN106300434A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102263502A (en) * | 2010-10-21 | 2011-11-30 | 江苏大全凯帆电器股份有限公司 | High-power wind power converter energy storage capacitor charging circuit |
| CN102521457A (en) * | 2011-12-15 | 2012-06-27 | 国网电力科学研究院 | Laplace transform based design method for flexible direct-current starting resistance |
| US20140139015A1 (en) * | 2012-11-19 | 2014-05-22 | Richard A. Poisson | Discrete input circuit |
| CN103259282A (en) * | 2013-04-08 | 2013-08-21 | 许继集团有限公司 | Soft cut-in method for non-isolated type photovoltaic grid-connected inverter and isolated type photovoltaic grid-connected inverter |
| CN103647442A (en) * | 2013-12-13 | 2014-03-19 | 北京天诚同创电气有限公司 | Pre-charging loop and power generating system |
| CN203747661U (en) * | 2014-03-24 | 2014-07-30 | 北京天诚同创电气有限公司 | Pre-charge device of wind power current transformer and wind power current transformer |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170104 |
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| RJ01 | Rejection of invention patent application after publication |