CN204119016U - A kind of electric power system of inverter low voltage ride through control system - Google Patents
A kind of electric power system of inverter low voltage ride through control system Download PDFInfo
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- CN204119016U CN204119016U CN201420508772.1U CN201420508772U CN204119016U CN 204119016 U CN204119016 U CN 204119016U CN 201420508772 U CN201420508772 U CN 201420508772U CN 204119016 U CN204119016 U CN 204119016U
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Abstract
An electric power system for inverter low voltage ride through control system, comprises supply transformer, rectification circuit, direct voltage converting unit, bypass circuit and storage capacitor; The primary side of described supply transformer is connected with the ac output end of electrical network or inverter, secondary side is connected with the input of rectification circuit, the output of described rectification circuit is also connected with filter capacitor, the rear class of filter capacitor is in series with direct voltage converting unit, bypass circuit and direct voltage converting unit are connected in parallel, the output of direct voltage converting unit is parallel with storage capacitor, and the rear class of storage capacitor connects using electricity system; The useful life of electricity consumption device can be extended, reducing soft the charging interval of inverter when starting, having the advantages that volume is little, cost is low.
Description
Technical field
The utility model belongs to photovoltaic parallel in system technical field, is specifically related to a kind of electric power system of inverter low voltage ride through control system.
Background technology
In photovoltaic parallel in system, the reliability that control system is powered is one of key of system reliability, the power supply of current inverter control system adopts more gets alternating current from grid side or inverter outlet side, then carries out, after rectification, carrying out direct current supply directly to control system through rectification circuit.In order to meet the requirement to inverter tolerance low-voltage electrical network ability in combining inverter relevant industries standard, need, at the in parallel a large amount of storage capacitor of the rectification circuit output end of electric power system, can normally work within the time of low voltage crossing to meet inverter.But storage capacitor is more in the program, thus it is comparatively large to bring volume to whole system, and high in cost of production problem, especially in the photovoltaic parallel in system that control system power consumption is larger, this problem is particularly serious.In addition because the storage capacitor in electric power system is comparatively large, the charging interval required when charging is long, needs soft problem of charging so there will be when inverter is started shooting when electric power system starts; Simultaneously when power network overvoltage, the alternating current got from net side is powered directly to control system after rectification, and the voltage that rectification may be caused to export exceeds the normal working voltage scope of electricity consumption device, thus can have influence on the useful life of electricity consumption device.
Summary of the invention
In order to overcome the shortcoming that above-mentioned prior art exists, the purpose of this utility model is the electric power system providing a kind of inverter low voltage ride through control system, this electric power system decreases the storage capacitor in system by voltage conversion circuit, soft the charging interval of inverter when starting can be reduced, and effectively can extend the useful life of electricity consumption device, there is the feature that volume is little, cost is low simultaneously.
For achieving the above object, the utility model by the following technical solutions:
An electric power system for inverter low voltage ride through control system, comprises supply transformer, rectification circuit, direct voltage converting unit, bypass circuit and storage capacitor; The primary side of described supply transformer is connected with the ac output end of electrical network or inverter, secondary side is connected with the input of rectification circuit, the output of described rectification circuit is also connected with filter capacitor, the rear class of filter capacitor is in series with direct voltage converting unit, described bypass circuit and direct voltage converting unit are connected in parallel, the output of direct voltage converting unit is parallel with storage capacitor, and the rear class of storage capacitor connects using electricity system.
Described bypass circuit adopts switching tube, relay or contactor to realize.
The main circuit that described direct voltage converting unit is is BOOST circuit or DC-DC change-over circuit.
Compared to the prior art, tool has the following advantages the utility model:
(1) the utility model by adding DC voltage changer unit in original electric power system; the out different direct current of rectification is made all to be convertible into voltage range needed for using electricity system; thus can available protecting electricity consumption device, extend the useful life of device.
(2) owing to adding direct voltage converting unit in electric power system, in circuit, just can meet power demands without the need to a large amount of storage capacitors, so not only reduce the volume of electric power system, and reduce cost.
(3) due to the reduction of storage capacitor in electric power system, thus soft the charging interval of inverter when starting can be reduced.
Accompanying drawing explanation
Fig. 1 is the utility model system construction drawing.
Fig. 2 low voltage ride-through capability requires curve chart.
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present utility model and operation principle are described in more detail.
As shown in Figure 1, the electric power system of a kind of inverter low voltage ride through control system of the utility model, comprises supply transformer, rectification circuit, direct voltage converting unit, bypass circuit and storage capacitor; The primary side of described supply transformer is connected with the ac output end of electrical network or inverter, secondary side is connected with the input of rectification circuit, described transformer realizes the isolation of electric power system and grid side, reach safety require and realize voltage matches, ensure that commutating voltage is also control system normal electricity consumption voltage when line voltage is normal; The output of described rectification circuit is also connected with filter capacitor, and rectification circuit completes the conversion of AC to DC voltage, and filter capacitor is mainly used in DC filtering; The rear class of filter capacitor is in series with direct voltage converting unit, for when grid voltage sags, convert the direct current that rectification exports to voltage range needed for control system, described direct voltage converting unit is parallel with bypass circuit, described bypass circuit is used at line voltage under normal circumstances, the direct current that rectification circuit exports directly is supplied the using electricity system of rear class, and requires no DC conversion unit and carry out voltage transitions; The output of direct voltage converting unit is parallel with storage capacitor, and the rear class of storage capacitor connects using electricity system.Described storage capacitor is used for regulated output voltage, and required holding time when providing no-voltage to pass through.
As preferred implementation of the present utility model, when line voltage is normal, the direct current that in electric power system, rectification circuit exports directly by bypass circuit, then is powered to using electricity system through the storage capacitor of rear class, and described bypass circuit can adopt switching tube, contactor or relay; When grid voltage sags, bypass circuit disconnects, the direct current that in electric power system, rectification circuit exports is by direct voltage converting unit, convert the direct current that rectification exports to voltage range needed for using electricity system, the main circuit of described direct voltage converting unit is BOOST circuit or DC-DC change-over circuit, ensures that the output voltage of voltage conversion unit meets the required voltage range of using electricity system.
As shown in Figure 2, at present according to the requirement of industry standard, photovoltaic parallel in system all needs to possess low voltage ride-through capability.Each standard requires as shown in Figure 2 to the low voltage ride-through capability that photovoltaic parallel in system must possess, as can be seen from the figure: generally different to the time rule maintained required for grid voltage sags to varying level, voltage is lower, and the time of required maintenance is shorter.In control system power supply plan provided by the utility model, the basis of former electric power system adds direct voltage converting unit, the direct voltage of different brackets can be converted to the electric pressure needed for using electricity system by this unit, thus ensures control system reliability service when line voltage fault of inverter.
Claims (3)
1. an electric power system for inverter low voltage ride through control system, is characterized in that: comprise supply transformer, rectification circuit, direct voltage converting unit, bypass circuit and storage capacitor; The primary side of described supply transformer is connected with the ac output end of electrical network or inverter, secondary side is connected with the input of rectification circuit, the output of described rectification circuit is also connected with filter capacitor, the rear class of filter capacitor is in series with direct voltage converting unit, described bypass circuit and direct voltage converting unit are connected in parallel, the output of direct voltage converting unit is parallel with storage capacitor, and the rear class of storage capacitor connects using electricity system.
2. the electric power system of a kind of inverter low voltage ride through control system according to claim 1, is characterized in that: the main circuit that described direct voltage converting unit is is BOOST circuit or DC-DC change-over circuit.
3. the electric power system of a kind of inverter low voltage ride through control system according to claim 1, is characterized in that: described bypass circuit adopts switching tube, relay or contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508772.1U CN204119016U (en) | 2014-09-04 | 2014-09-04 | A kind of electric power system of inverter low voltage ride through control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420508772.1U CN204119016U (en) | 2014-09-04 | 2014-09-04 | A kind of electric power system of inverter low voltage ride through control system |
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| Publication Number | Publication Date |
|---|---|
| CN204119016U true CN204119016U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420508772.1U Active CN204119016U (en) | 2014-09-04 | 2014-09-04 | A kind of electric power system of inverter low voltage ride through control system |
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| CN (1) | CN204119016U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505524A (en) * | 2023-06-29 | 2023-07-28 | 深圳市高斯宝电气技术有限公司 | Power grid electricity taking topology of household storage inverter |
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2014
- 2014-09-04 CN CN201420508772.1U patent/CN204119016U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505524A (en) * | 2023-06-29 | 2023-07-28 | 深圳市高斯宝电气技术有限公司 | Power grid electricity taking topology of household storage inverter |
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| C14 | Grant of patent or utility model | ||
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