CN103840483B - A kind of for low voltage crossing electric power system - Google Patents
A kind of for low voltage crossing electric power system Download PDFInfo
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- CN103840483B CN103840483B CN201410059852.8A CN201410059852A CN103840483B CN 103840483 B CN103840483 B CN 103840483B CN 201410059852 A CN201410059852 A CN 201410059852A CN 103840483 B CN103840483 B CN 103840483B
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- capacitor
- rectifier bridge
- contactor
- negative pole
- power supply
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Abstract
The invention discloses a kind of for low voltage crossing electric power system, by multi output winding transformer, rectifier bridge, capacitor, relay, contactor and Switching Power Supply composition, when photovoltaic combining inverter normally works, the power taking of multi output winding transformer, in inverter ac outlet side, reaches required alternating voltage by the former limit N1 of multi output winding transformer and the turn ratio of secondary N2, N3, powers for contactor control and auxiliary circuit by after rectifier bridge rectification.The present invention is according to corresponding low-voltage crossing standard-required, when the line voltage short time is fallen, MCU control unit sends disconnection or the pickup time of corresponding instruction control contactor according to the line voltage value of sampling, when falling by simply controlling just to realize the line voltage short time, can be voltage required when combining inverter continues to provide inverter auxiliary circuit and contactor to turn on and off within the standard-required time.
Description
Technical field
The present invention relates to a kind of generation of electricity by new energy technology, particularly relate to a kind of for low voltage crossing electric power system.
Background technology
As everyone knows, the range of application of power electronic technology is very extensive.It is also widely used in communications and transportation, electric power system, communication system, computer system, new energy resources system not only for general industry.After energy crisis, various new source, regenerative resource and new-generation mode more and more come into one's own.Wherein the development of wind power generation, solar power generation is rapidly developed, and after particularly experienced by 11 years Fukushima, Japan nuclear leakage events, people propose query to the applicable fail safe of core, and even someone proposes the thoughts such as stoning.Meanwhile, wind energy, solar energy, as clean regenerative resource, are more and more subject to the attention of countries in the world, thus accelerate the development of clean reproducible energy.The clean energy resource such as wind energy, photovoltaic is generated electricity by way of merging two or more grid systems and is more and more subject to the favor of people.Coming 10 years, under various countries' new forms of energy support on policy, the generation of electricity by new energy such as wind energy, photovoltaic market will by reducing costs, improve the means such as transformation efficiency to expand rapidly, all kinds of generation of electricity by new energy associated materials market is also by fast development, and wherein Europe, the U.S. and the Asian-Pacific area will become growth core space.
Along with the application of large-scale photovoltaic or wind power grid generating brings problems to electrical network, various countries are corresponding has put into effect all kinds of technical standard of generating electricity by way of merging two or more grid systems, in a standard for high-power photovoltaic synchronization inverter, require that it must have low voltage crossing, even there is no-voltage and pass through function.In order to photovoltaic combining inverter can better realize low-voltage crossing, a kind of power supply circuits for low voltage crossing are now proposed.
Low voltage crossing circuit is primarily of contactor (KM), and relay (REL1, REL2), multi output winding transformer (T), controller (MCU), capacitor (C1, C2, C3, C4), Switching Power Supply (SMPS), rectifier (D1, D2) forms.
Summary of the invention
Technical problem to be solved by this invention is: when high-power photovoltaic synchronization inverter normally works, many employings self-powered scheme, and when dropping into rated voltage 20% or zero within the electrical network short time, how high-power photovoltaic synchronization inverter realizes combining inverter powerup issue when low pressure or no-voltage are passed through.
For the problems referred to above, the technical solution used in the present invention is: a kind of for low voltage crossing electric power system, these power supply circuits scheme is by multi output winding transformer (T), rectifier bridge (D1, D2), capacitor (C1, C2, C3, C4), relay (REL1, REL2), contactor (KM) and Switching Power Supply (SMPS) composition, shown in schematic diagram Fig. 1.
1. multi output winding transformer (T) N1 two ends, former limit (A, B) is connected in inverter three-phase alternating current outlet side on any two lines, under now inverter works in self-powered mode condition;
2. transformer secondary output N2 two ends (C, D), are connected to rectifier bridge (D1) and exchange end, rectifier bridge D1 exports two ends, positive pole is connected to relay R EL1 the 1st pin, and the DC control that relay R EL1 the 2nd pin is connected to contactor rectifies pole, and rectifier bridge negative pole connects contactor (KM) DC control end negative pole end; Big capacity electrolyte capacitor C1, C2 positive pole is connected to D1 output cathode end, and electric capacity negative pole is connected to D1 output negative pole;
3. transformer secondary output N3 two ends (E, F) be connected to rectifier bridge (D2) and exchange end, D2 output head anode is connected to Switching Power Supply input positive terminal, D2 output negative pole is connected to Switching Power Supply (SMPS) and inputs negative pole end, big capacity electrolyte capacitor (C3, C4) positive pole is connected to D2 output cathode end, and electric capacity negative pole is connected to D1 output negative pole end; Switching Power Supply (SMPS) 24 volts of voltage output ends, positive pole is connected to relay R EL2 the 1st pin, relay the 2nd pin is connected to the positive terminal of contactor (KM) PLC control unit, and Switching Power Supply 24 volts of output negative poles are directly connected to the negative pole end of contactor (KM) PLC control unit; Big capacity electrolyte capacitor (C3, C4) positive pole is connected to rectifier bridge output cathode end, and electric capacity negative pole is connected to rectifier bridge output negative pole end;
4. Switching Power Supply (SMPS) output is inverter auxiliary circuit and main control unit (MCU) power supply simultaneously.
The invention has the beneficial effects as follows: according to corresponding low-voltage crossing standard-required, when the line voltage short time is fallen, MCU control unit sends disconnection or the pickup time of corresponding instruction control contactor according to the line voltage value of sampling, when falling by simply controlling just to realize the line voltage short time, can be voltage required when combining inverter continues to provide inverter auxiliary circuit and contactor to turn on and off within the standard-required time.
Accompanying drawing explanation
Fig. 1 is power supply circuits schematic diagram of the present invention.
Fig. 2 is that 220V AC line bag of the present invention controls schematic diagram.
Schematic diagram when Fig. 3 is contactor PLC of the present invention control.
Fig. 4 be electrical network of the present invention when falling line bag control schematic diagram.
Fig. 5 be electrical network of the present invention when falling PLC control for electrical schematic.
Embodiment
Below in conjunction with accompanying drawing, by specific embodiment, technical solution of the present invention is described further.
As shown in Figure 1, Fig. 1 is power supply circuits schematic diagram of the present invention.The specific works pattern of the present embodiment is as follows:
1, when photovoltaic combining inverter normally works, inverter auxiliary circuit is by inverter self-powered, namely the power taking of multi output winding transformer is in inverter ac outlet side, required alternating voltage is reached by the former limit N1 of transformer and the turn ratio of secondary N2, N3, power for contactor control and auxiliary circuit by after rectifier bridge rectification, connected mode schematic diagram figure as indicated with 1;
2, when the REL1 adhesive of control unit control relay, contactor line bag connects 220V direct voltage, contactor adhesive, and when relay R EL1 disconnects, contactor disconnects simultaneously; Just can indirectly control three-phase contactor attracting state by the attracting state of control relay REL1, thus control combining inverter also, talkaround state; Concrete control loop as shown in Figure 2;
3, when adopting contactor 24 volts of PLC single control unit controls, when electrical network is normal, alternating voltage is after transformer (T) secondary N3 to rectifier bridge rectification, export 24V direct voltage through Switching Power Supply (SMPS) again, when control relay REL2 adhesive, contactor PLC control unit has 24V direct voltage, contactor adhesive, when relay R EL2 disconnects, PLC control unit 24V direct voltage disconnects, and corresponding contactor disconnects simultaneously; Just three-phase contactor attracting state be can indirectly control by the attracting state of control relay REL2, thus combining inverter and electrical network controlled and talkaround state; Concrete control electric current as shown in Figure 3;
4, when falling in the electrical network short time, when dip duration is in corresponding critical field, when even falling to 0 when voltage drops to 20% of rated voltage, now inverter ac side output voltage is not enough to maintain inverter auxiliary circuit operating voltage and contactor control voltage, now, (1), when adopting 220V DC voltage control contactor to control, now powers by big capacity electrolyte capacitor (C1 in the short time, C2) provide, supply current loop as shown in Figure 4; (2) when adopting contactor 24 volts of PLC control unit as contactor adhesive control unit, 24V Switching Power Supply is by big capacity electrolyte capacitor (C3, C4) power supply, and current circuit as shown in Figure 4;
5, to wear or no-voltage passes through the required duration according to low accordingly, by controller to line voltage sampled value and dip duration come control inverter also, talkaround state, simultaneously can duration required by standard, select electrochemical capacitor (C1, C2, C3, C4) capacitance size.
The foregoing is only the preferred embodiment of the present invention; not limit practical range of the present invention with this, all persons that is familiar with technique, use principle of the present invention and technical characteristic; the various change done and decoration, all should be covered by within protection category that these claims define.
Claims (1)
1. one kind for low voltage crossing electric power system, it is characterized in that: it is by multi output winding transformer (T), first rectifier bridge (D1), second rectifier bridge (D2), first capacitor (C1), second capacitor (C2), 3rd capacitor (C3), 4th capacitor (C4), first relay (REL1), the second relay (REL2), contactor (KM) and Switching Power Supply (SMPS) composition, former N1 two ends, the limit (A, B) of described multi output winding transformer (T) to be connected in inverter three-phase alternating current outlet side on any two lines;
First capacitor (C1), the second capacitor (C2), the 3rd capacitor (C3), the 4th capacitor (C4) is big capacity electrolyte capacitor device;
The secondary N2 two ends (C of described multi output winding transformer (T), D), be connected to the first rectifier bridge (D1) and exchange end, first rectifier bridge (D1) exports two ends, positive pole is connected to the first relay (REL1) the 1st pin, the DC control that first relay (REL1) the 2nd pin is connected to contactor rectifies pole, and rectifier bridge negative pole connects contactor (KM) DC control end negative pole end; First capacitor (C1) and the second capacitor (C2) positive pole are connected to the first rectifier bridge (D1) output cathode end, and the first capacitor (C1) and the second capacitor (C2) negative pole are connected to the first rectifier bridge (D1) output negative pole;
The secondary N3 two ends (E of described multi output winding transformer (T), F) be connected to the second rectifier bridge (D2) and exchange end, second rectifier bridge (D2) output head anode is connected to Switching Power Supply input positive terminal, second rectifier bridge (D2) output negative pole is connected to Switching Power Supply (SMPS) and inputs negative pole end, 3rd capacitor (C3) and the 4th capacitor (C4) positive pole are connected to the second rectifier bridge (D2) output cathode end, and the 3rd capacitor (C3) and the 4th capacitor (C4) negative pole are connected to the second rectifier bridge (D2) output negative pole end; Switching Power Supply (SMPS) 24 volts of voltage output ends, positive pole is connected to the second relay (REL2) the 1st pin, second relay (REL2) the 2nd pin is connected to the positive terminal of contactor (KM) PLC control unit, and Switching Power Supply 24 volts of output negative poles are directly connected to the negative pole end of contactor (KM) PLC control unit;
Switching Power Supply (SMPS) output is inverter auxiliary circuit and main control unit (MCU) power supply simultaneously;
When photovoltaic combining inverter normally works, multi output winding transformer (T) power taking is in inverter ac outlet side, reach required alternating voltage by the former limit N1 of multi output winding transformer (T) and the turn ratio of secondary N2, N3, power for contactor control and auxiliary circuit by after rectifier bridge rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410059852.8A CN103840483B (en) | 2014-02-24 | 2014-02-24 | A kind of for low voltage crossing electric power system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410059852.8A CN103840483B (en) | 2014-02-24 | 2014-02-24 | A kind of for low voltage crossing electric power system |
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| CN103840483A CN103840483A (en) | 2014-06-04 |
| CN103840483B true CN103840483B (en) | 2016-02-10 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104104217A (en) * | 2014-07-08 | 2014-10-15 | 安徽金峰新能源股份有限公司 | Power energy storage module for under-voltage protection of 500kW and 630kW photovoltaic inverter |
| KR20160044353A (en) * | 2014-10-15 | 2016-04-25 | 엘에스산전 주식회사 | Grid-connected photovoltaics system |
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| JPH03101028A (en) * | 1989-09-13 | 1991-04-25 | Hitachi Ltd | Electromagnetic contactor |
| CN2862305Y (en) * | 2005-12-31 | 2007-01-24 | 濮兴华 | Double voltage A. C. contactor |
| CN201726116U (en) * | 2010-06-18 | 2011-01-26 | 王建军 | Voltage sag protection controller |
| CN103001253B (en) * | 2012-11-22 | 2016-04-20 | 许继电气股份有限公司 | Be suitable for photovoltaic DC-to-AC converter electric power system and the method for supplying power to thereof of lower voltage ride-through requirement |
| CN203690944U (en) * | 2014-02-24 | 2014-07-02 | 南京冠亚电源设备有限公司 | Low voltage ride through power supply system |
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