CN104467390A - Current converter protection circuit and current converter with same - Google Patents
Current converter protection circuit and current converter with same Download PDFInfo
- Publication number
- CN104467390A CN104467390A CN201410695614.6A CN201410695614A CN104467390A CN 104467390 A CN104467390 A CN 104467390A CN 201410695614 A CN201410695614 A CN 201410695614A CN 104467390 A CN104467390 A CN 104467390A
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- converter
- diode
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- filter circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a current converter protection circuit and a current converter with the current converter protection circuit. According to the current converter protection circuit, a diode is arranged between each phase of filter circuit of the current converter and a positive bus-bar of the current converter, and the cathode of each diode is connected with the positive bus-bar of the current converter. Meanwhile, a diode is arranged between each phase of filter circuit of the current converter and a negative bus-bar of the current converter, and the anode of each diode is connected with the negative bus-bar of the current converter. The power frequency diodes high in capacity of resisting to current impact are preferentially selected. By applying current converter protection circuit to the current converter, the defects that because of short-circuiting of the bus-bars of the current converter, fusing occurs, and meanwhile current conversion switch components are damaged are overcome, and the current converter protection circuit has the effect of protecting the current converter and improves the safety and reliability of the current converter.
Description
Technical field
The present invention relates to converter technical field, particularly relate to a kind of converter unit protection circuit and comprise the converter of this circuit.
Background technology
Converter is equipment direct current and alternating current mutually changed, and is now widely used in the occasions such as uninterrupted power supply (Uninterruptible Power Supply, UPS), photovoltaic.Traditional converter generally adopts high-speed semiconductor device as switching device, substantially increases switching frequency and system power-density.But high-frequency element power of resisting voltaic impingement is poor, when being applied to the occasion such as UPS, photovoltaic, the possibility causing converter bus to be short-circuited because of peripheral fault is higher, as the short circuit of photovoltaic DC-to-AC converter input, UPS battery are short-circuited.In converter busbar short-circuit situation, power network current may pour into bus, and form very large short circuit current, while fuse melting, commutation switch device too overcurrent damage occurs.
Summary of the invention
For above-mentioned technical problem; the object of the present invention is to provide a kind of converter unit protection circuit and comprise the converter of this circuit; by this converter unit protection circuit application in converter; when converter bus is short-circuited; make the electric current flowing through commutation switch element very little; damage commutation switch device while avoiding fuse melting, there is the effect of protection converter, and improve fail safe, the reliability of converter.
For reaching this object, the present invention by the following technical solutions:
A kind of converter unit protection circuit, this circuit all arranges a diode between the grid side and the positive bus-bar of converter of the inductance of each phase filter circuit of converter, and wherein, the negative electrode of described diode connects the positive bus-bar of converter; Meanwhile, between the grid side and the negative busbar of converter of the inductance of each phase filter circuit of converter, all arrange a diode, wherein, the anode of described diode connects the negative busbar of converter.
Especially, when filter circuit is lc circuit, described diode correspondence is arranged between the grid side of the inductance of each phase LC filter circuit and the positive/negative bus of converter.
Especially, when filter circuit is LCL circuit, described diode correspondence is arranged between the grid side of the grid side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
Especially, when filter circuit is LCL circuit, between the grid side that described diode correspondence is arranged at the converter side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
Especially, described diode is power frequency diode.
The invention also discloses a kind of converter, it comprises above-mentioned converter unit protection circuit.
Especially, when filter circuit is lc circuit, the diode in described converter unit protection circuit is arranged between the grid side of the inductance of each phase LC filter circuit and the positive/negative bus of converter.
Especially, when filter circuit is LCL circuit, the diode in described converter unit protection circuit is arranged between the grid side of the grid side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
Especially, when filter circuit is LCL circuit, between the grid side that the diode in described converter unit protection circuit is arranged at the converter side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
The converter unit protection circuit application that the present invention proposes is in converter, by the diode that the grid side of the inductance at each phase filter circuit of converter and the positive bus-bar of converter are arranged, and the diode arranged between the grid side and the negative busbar of converter of the inductance of each phase filter circuit of converter, when converter busbar short-circuit, power network current pours into bus, because of the bypass effect of diode, short circuit current flows to bus mainly through diode, and the electric current flowing to commutation switch element is very little, converter is shielded, and improve the fail safe of converter, reliability.
Accompanying drawing explanation
Fig. 1 is that the converter unit protection circuit application that provides of the embodiment of the present invention 1 is in the circuit structure diagram of inverter;
Fig. 2 is that the converter unit protection circuit application that provides of the embodiment of the present invention 2 is in the circuit structure diagram of inverter;
Fig. 3 is that the converter unit protection circuit application that provides of the embodiment of the present invention 3 is in the circuit structure diagram of inverter;
Fig. 4 is that the converter unit protection circuit application that provides of the embodiment of the present invention 4 is in the circuit structure diagram of inverter;
Fig. 5 is that the converter unit protection circuit application that provides of the embodiment of the present invention 5 is in the circuit structure diagram of rectifier;
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention it also should be noted that, for convenience of description, illustrate only part related to the present invention but not full content in accompanying drawing.
Converter can be divided into two classes: inverter and rectifier, and the converter unit protection circuit that the present invention proposes both can be applied to inverter, also can be applied to rectifier.
Embodiment one
In the present embodiment, converter unit protection circuit application is in the inverter adopting LCL filter circuit.
As shown in Figure 1, converter adopts T-shaped three-level photovoltaic inverter, exports as phase three-wire three, input voltage 500V ~ 1000V, output line voltage 315V.Inverse switch device T1 adopts insulated gate bipolar transistor (Insulated Gate Bipolar Transistor; IGBT); inverse switch device T1 output connects LCL filter circuit, adopts fast molten insurance F11, F12, F13 as current protection device between filter circuit and electrical network.LCL filter circuit comprises converter side inductance L 11A, L11B, L11C and grid side inductance L 12A, L12B, L12C and electric capacity.The present invention arranges a diode D11 between the converter side inductance L 11A grid side and the positive bus-bar of inverter of inverter U phase LCL filter circuit, between the converter side inductance L 11B grid side and the positive bus-bar of inverter of inverter V phase LCL filter circuit, a diode D12 is set, between the converter side inductance L 11C grid side and the positive bus-bar of inverter of inverter W phase LCL filter circuit, arrange a diode D13, the negative electrode of described diode D11, D12, D13 connects the positive bus-bar of inverter; Simultaneously, between the converter side inductance L 11A grid side and the negative busbar of inverter of inverter U phase LCL filter circuit, a diode D14 is set, between the converter side inductance L 11B grid side and the negative busbar of inverter of inverter V phase LCL filter circuit, a diode D15 is set, between the converter side inductance L 11C grid side and the negative busbar of inverter of inverter W phase LCL filter circuit, arrange a diode D16, the anode of described diode D14, D15, D16 connects the negative busbar of inverter.
When inverter input direct-current bus is short-circuited; its output gets access to grid current flowing backwards bus; because converter side inductance L 11A, L11B, L11C impedance are obviously greater than diode D11-D16 branch impedance; therefore short circuit current flows to bus mainly through diode D11-D16; the electric current flowing through inverse switch device T1 is very little; after certain hour, insure F11, F12, F13 fusing, fault departs from, therefore inverter is protected.If remove diode D11-D16, when inverter input direct-current bus is short-circuited, its output gets access to grid current flowing backwards bus, and all electric currents are through inverse switch device T1, and it is comparatively slow to insure F11, F12, F13 fusing speed, inverse switch device T1 directly will be damaged.
Embodiment two
In the present embodiment, converter unit protection circuit application is in the inverter adopting LCL filter circuit.
As shown in Figure 2, converter adopts T-shaped three-level photovoltaic inverter, exports as phase three-wire three, input voltage 500V ~ 1000V, output line voltage 315V.Inverse switch device T2 adopts IGBT, and inverse switch device T2 output connects LCL filter circuit, adopts fast molten insurance F21, F22, F23 as current protection device between filter circuit and electrical network.LCL filter circuit comprises converter side inductance L 21A, L21B, L21C and grid side inductance L 22A, L22B, L22C and electric capacity.The present invention arranges a diode D21 between the grid side inductance L 22A grid side and the positive bus-bar of inverter of inverter U phase LCL filter circuit, between the grid side inductance L 22B grid side and the positive bus-bar of inverter of inverter V phase LCL filter circuit, a diode D22 is set, between the grid side inductance L 22C grid side and the positive bus-bar of inverter of inverter W phase LCL filter circuit, arrange a diode D23, the negative electrode of described diode D21, D22, D23 connects the positive bus-bar of inverter; Simultaneously, between the grid side inductance L 22A grid side and the negative busbar of inverter of inverter U phase LCL filter circuit, a diode D24 is set, between the grid side inductance L 22B grid side and the negative busbar of inverter of inverter V phase LCL filter circuit, a diode D25 is set, between the grid side inductance L 22C grid side and the negative busbar of inverter of inverter W phase LCL filter circuit, arrange a diode D26, the anode of described diode D24, D25, D26 connects the negative busbar of inverter
When inverter input direct-current bus is short-circuited; its output gets access to grid current flowing backwards bus; because grid side inductance L 22A, L22B, L22C impedance are obviously greater than diode D21-D26 branch impedance; therefore short circuit current flows to bus mainly through diode D21-D26; the electric current flowing through inverse switch device T2 is very little; after certain hour, insure F21, F22, F23 fusing, fault departs from, therefore inverter is protected.If remove diode D21-D26, when inverter input direct-current bus is short-circuited, its output gets access to grid current flowing backwards bus, and all electric currents are through inverse switch device T2, and it is comparatively slow to insure F21, F22, F23 fusing speed, inverse switch device T2 directly will be damaged.
Embodiment three
In the present embodiment, converter unit protection circuit application is in the inverter adopting LC filter circuit.
As shown in Figure 3, converter adopts T-shaped three-level photovoltaic inverter, exports as phase three-wire three, input voltage 500V ~ 1000V, output line voltage 315V.Inverse switch device T3 adopts IGBT, and inverse switch device T3 output connects LC filter circuit, adopts fast molten insurance F31, F32, F33 as current protection device between filter circuit and electrical network.LC filter circuit comprises inductance L 3A, L3B, L3C and electric capacity.The present invention arranges a diode D31 between the inductance L 3A grid side and the positive bus-bar of inverter of inverter U phase LC filter circuit, between the inductance L 3B grid side and the positive bus-bar of inverter of inverter V phase LC filter circuit, a diode D32 is set, between the inductance L 3C grid side and the positive bus-bar of inverter of inverter W phase LC filter circuit, arrange a diode D33, the negative electrode of described diode D31, D32, D33 connects the positive bus-bar of inverter; Simultaneously, between the inductance L 3A grid side and the negative busbar of inverter of inverter U phase LC filter circuit, a diode D34 is set, between the inductance L 3B grid side and the negative busbar of inverter of inverter V phase LC filter circuit, a diode D35 is set, between the inductance L 3C grid side and the negative busbar of inverter of inverter W phase LC filter circuit, arrange a diode D36, the anode of described diode D34, D35, D36 connects the negative busbar of inverter.
When inverter input direct-current bus is short-circuited; its output gets access to grid current flowing backwards bus; because inductance L 3A, L3B, L3C impedance are obviously greater than diode D31-D36 branch impedance; therefore short circuit current flows to bus mainly through diode D31-D36; the electric current flowing through inverse switch device T3 is very little; after certain hour, insure F31, F32, F33 fusing, fault departs from, therefore inverter is protected.If remove diode D31-D36, when inverter input direct-current bus is short-circuited, its output gets access to grid current flowing backwards bus, and all electric currents are through inverse switch device T3, and it is comparatively slow to insure F31, F32, F33 fusing speed, inverse switch device T3 directly will be damaged.
Embodiment four
In the present embodiment, converter unit protection circuit application is in the inverter adopting LC filter circuit.
As shown in Figure 4, converter adopts the inverter exported as single-phase, and inverse switch device T4 adopts IGBT, and inverse switch device T4 output connects LC filter circuit, adopts fast molten insurance F41, F42 as current protection device between filter circuit and electrical network.LC filter circuit comprises inductance L 4A, L4B and electric capacity.The present invention arranges a diode D41 between the inductance L 4A grid side and the positive bus-bar of inverter of inverter L phase LC filter circuit, between the inductance L 4B grid side and the positive bus-bar of inverter of inverter N phase LC filter circuit, arrange a diode D42, the negative electrode of described diode D41, D42 connects the positive bus-bar of inverter; Simultaneously, between the inductance L 4A grid side and the negative busbar of inverter of inverter L phase LC filter circuit, a diode D43 is set, between the inductance L 4B grid side and the negative busbar of inverter of inverter N phase LC filter circuit, arrange a diode D44, the anode of described diode D43, D44 connects the negative busbar of inverter.
When inverter input direct-current bus is short-circuited; its output gets access to grid current flowing backwards bus; because inductance L 4A, L4B impedance are obviously greater than diode D41-D44 branch impedance; therefore short circuit current flows to bus mainly through diode D41-D44; the electric current flowing through inverse switch device T4 is very little; after certain hour, insure F41, F42 fusing, fault departs from, therefore inverter is protected.If remove diode D41-D44, when inverter input direct-current bus is short-circuited, its output gets access to grid current flowing backwards bus, and all electric currents are through inverse switch device T4, and it is comparatively slow to insure F41, F42 fusing speed, inverse switch device T4 directly will be damaged.
Embodiment five
In the present embodiment, converter unit protection circuit application is in the rectifier adopting LC filter circuit.
As shown in Figure 5, converter adopts the rectifier exported as phase three-wire three.Rectifier switch device T5 input connects LC filter circuit, adopts fast molten insurance F51, F52, F53 as current protection device between filter circuit and electrical network.LC filter circuit comprises inductance L 5A, L5B, L5C and electric capacity.The present invention arranges a diode D51 between the inductance L 5A grid side and the positive bus-bar of rectifier of rectifier U phase LC filter circuit, between the inductance L 5B grid side and the positive bus-bar of rectifier of rectifier V phase LC filter circuit, a diode D52 is set, between the inductance L 5C grid side and the positive bus-bar of rectifier of rectifier W phase LC filter circuit, arrange a diode D53, the negative electrode of described diode D51, D52, D53 connects the positive bus-bar of rectifier; Simultaneously, between the inductance L 5A grid side and the negative busbar of rectifier of rectifier U phase LC filter circuit, a diode D54 is set, between the inductance L 5B grid side and the negative busbar of rectifier of rectifier V phase LC filter circuit, a diode D55 is set, between the inductance L 5C grid side and the negative busbar of rectifier of rectifier W phase LC filter circuit, arrange a diode D56, the anode of described diode D54, D55, D56 connects the negative busbar of rectifier.
When rectifier output DC bus is short-circuited; electric current that its input gets access to grid pours into bus; because inductance L 5A, L5B, L5C impedance are obviously greater than diode D51-D56 branch impedance; therefore short circuit current flows to bus mainly through diode D51-D56; the electric current flowing through rectifier switch device T5 is very little; after certain hour, insure F51, F52, F53 fusing, fault departs from, therefore rectifier is protected.If remove diode D51-D56, when rectifier output DC bus is short-circuited, electric current that its input gets access to grid pours into bus, and all electric currents are through rectifier switch device T5, and it is comparatively slow to insure F51, F52, F53 fusing speed, rectifier switch device T5 directly will be damaged.
In like manner, the inverter in embodiment one, two, four can be also rectifier, realizes when rectifier output DC bus is short-circuited, protection rectifier.
It should be noted that, inverter described in above-described embodiment can be two-level inverter, also can be three-level inverter; The preferred power frequency diode of described diode, the resistance to rush of current ability of power frequency diode is strong, and during fuse melting, diode still remains intact.
Technical scheme of the present invention when converter busbar short-circuit, power network current pour into bus, can be avoided the damage of commutation switch element, shields to converter, and improves fail safe, the reliability of converter.
Above are only preferred embodiment of the present invention and institute's application technology principle, be anyly familiar with those skilled in the art in the technical scope that the present invention discloses, the change that can expect easily or replacement, all should be encompassed in protection scope of the present invention.
Claims (9)
1. a converter unit protection circuit, is characterized in that:
This circuit all arranges a diode between the grid side and the positive bus-bar of converter of the inductance of each phase filter circuit of converter, and wherein, the negative electrode of described diode connects the positive bus-bar of converter;
Between the grid side and the negative busbar of converter of the inductance of each phase filter circuit of converter, all arrange a diode, wherein, the anode of described diode connects the negative busbar of converter.
2. converter unit protection circuit according to claim 1, is characterized in that, if filter circuit is lc circuit, then described diode correspondence is arranged between the grid side of the inductance of each phase LC filter circuit and the positive/negative bus of converter.
3. converter unit protection circuit according to claim 1, is characterized in that, if filter circuit is LCL circuit, then described diode correspondence is arranged between the grid side of the grid side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
4. converter unit protection circuit according to claim 1, is characterized in that, if filter circuit is LCL circuit, then between the described diode correspondence grid side that is arranged at the converter side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
5. according to the converter unit protection circuit one of Claims 1-4 Suo Shu, it is characterized in that, described diode is power frequency diode.
6. a converter, is characterized in that, this converter comprises converter unit protection circuit according to claim 1.
7. converter according to claim 6, is characterized in that, if filter circuit is lc circuit, then the diode in described converter unit protection circuit is arranged between the grid side of the inductance of each phase LC filter circuit and the positive/negative bus of converter.
8. converter according to claim 6, is characterized in that, if filter circuit is LCL circuit, then the diode in described converter unit protection circuit is arranged between the grid side of the grid side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
9. converter according to claim 6, is characterized in that, if filter circuit is LCL circuit, then between the grid side that the diode in described converter unit protection circuit is arranged at the converter side inductance of each phase LCL filter circuit and the positive/negative bus of converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410695614.6A CN104467390A (en) | 2014-11-26 | 2014-11-26 | Current converter protection circuit and current converter with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410695614.6A CN104467390A (en) | 2014-11-26 | 2014-11-26 | Current converter protection circuit and current converter with same |
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| Publication Number | Publication Date |
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| CN104467390A true CN104467390A (en) | 2015-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410695614.6A Pending CN104467390A (en) | 2014-11-26 | 2014-11-26 | Current converter protection circuit and current converter with same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698496A (en) * | 2017-10-20 | 2019-04-30 | 株洲中车时代电气股份有限公司 | A kind of rail traffic tractive power supply system and control method |
| CN113629988A (en) * | 2021-08-13 | 2021-11-09 | 阳光电源股份有限公司 | PWM rectifier and short-circuit protection device thereof |
| FR3143235A1 (en) | 2022-12-09 | 2024-06-14 | Electricite De France | METHOD FOR PROTECTING CONVERTERS AGAINST DOWNSTREAM SHORT CIRCUITS |
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| JP4096656B2 (en) * | 2002-08-02 | 2008-06-04 | 富士電機機器制御株式会社 | Rectifier |
| WO2009058025A1 (en) * | 2007-10-31 | 2009-05-07 | Eltek Valere As | Device arranged for converting an ac input voltage to a dc output voltage |
| CN101919149A (en) * | 2007-10-31 | 2010-12-15 | 依利安达瓦莱尔公司 | Device arranged for converting an AC input voltage to a DC output voltage |
| CN102754320A (en) * | 2009-08-10 | 2012-10-24 | 艾默生环境优化技术有限公司 | System and method for power factor correction |
| CN204216777U (en) * | 2014-11-26 | 2015-03-18 | 无锡上能新能源有限公司 | A kind of converter unit protection circuit and comprise the converter of this circuit |
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2014
- 2014-11-26 CN CN201410695614.6A patent/CN104467390A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4096656B2 (en) * | 2002-08-02 | 2008-06-04 | 富士電機機器制御株式会社 | Rectifier |
| WO2009058025A1 (en) * | 2007-10-31 | 2009-05-07 | Eltek Valere As | Device arranged for converting an ac input voltage to a dc output voltage |
| CN101919149A (en) * | 2007-10-31 | 2010-12-15 | 依利安达瓦莱尔公司 | Device arranged for converting an AC input voltage to a DC output voltage |
| CN102754320A (en) * | 2009-08-10 | 2012-10-24 | 艾默生环境优化技术有限公司 | System and method for power factor correction |
| CN204216777U (en) * | 2014-11-26 | 2015-03-18 | 无锡上能新能源有限公司 | A kind of converter unit protection circuit and comprise the converter of this circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109698496A (en) * | 2017-10-20 | 2019-04-30 | 株洲中车时代电气股份有限公司 | A kind of rail traffic tractive power supply system and control method |
| CN113629988A (en) * | 2021-08-13 | 2021-11-09 | 阳光电源股份有限公司 | PWM rectifier and short-circuit protection device thereof |
| CN113629988B (en) * | 2021-08-13 | 2023-10-31 | 阳光电源股份有限公司 | PWM rectifier and short-circuit protection device thereof |
| FR3143235A1 (en) | 2022-12-09 | 2024-06-14 | Electricite De France | METHOD FOR PROTECTING CONVERTERS AGAINST DOWNSTREAM SHORT CIRCUITS |
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Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: SINENG ELECTRIC Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: Top energy Electric Co.,Ltd. Address after: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant after: Top energy Electric Co.,Ltd. Address before: 214174 Jiangsu Province Economic Development Zone, Huishan wind power science and Technology Industrial Park, wind energy road, No. 1 standard factory building Applicant before: WUXI SINENG NEW ENERGY CO.,LTD. |
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Application publication date: 20150325 |