CN203218880U - Photovoltaic DC bus grid-connection apparatus - Google Patents
Photovoltaic DC bus grid-connection apparatus Download PDFInfo
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- CN203218880U CN203218880U CN 201320158612 CN201320158612U CN203218880U CN 203218880 U CN203218880 U CN 203218880U CN 201320158612 CN201320158612 CN 201320158612 CN 201320158612 U CN201320158612 U CN 201320158612U CN 203218880 U CN203218880 U CN 203218880U
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Abstract
The utility model discloses a photovoltaic DC bus grid-connection apparatus. An input terminal and an output terminal of the grid-connection apparatus are respectively connected with a photovoltaic-assembly square matrix and a DC bus. The input terminal is connected with an insulation monitoring apparatus for detecting whether the photovoltaic-assembly square matrix has enough insulating performance to the ground. A rear end of the insulation monitoring apparatus is connected with a BUCK circuit for carrying out voltage reduction of DC electric energy. The other end of the BUCK circuit is connected with an opening apparatus. The other end of the opening apparatus is connected with the output terminal. The DC electric energy after performing the voltage reduction enters in the DC bus by the output terminal. The BUCK circuit is also provided with a grid-connection control apparatus for sampling and processing correlative signals of the BUCK circuit. According to the photovoltaic DC bus grid-connection apparatus provided by the utility model, inversion links of photovoltaic grid connection are reduced, system efficiency is raised; because devices of the grid-connection apparatus are reduced simultaneously, system reliability is enhanced and concise and high-efficiency DC grid-connection functions can be realized.
Description
Technical field
The utility model relates to photovoltaic generation, is specifically related to a kind of photovoltaic DC bus grid-connecting apparatus.
Background technology
Along with continuous development in recent years, global photovoltaic generation installation total capacity is in growth at full speed.Along with the expansion gradually of installation scale, some drawbacks in conventional photovoltaic power station also manifest gradually, and that especially embodies in the large-sized photovoltaic surface power station is more obvious.This class power station is usually built in illumination condition the Northwest preferably, however these areas local not big load usually, so the electric energy that the power station produces can only incorporate local power transmission network into, by using for load after the long-distance transmission.This mode has determined that the power station rate for incorporation into the power network can not be very high.The pay off period in power station is also longer relatively.
Meanwhile, for example non-ferrous metal metallurgy of some high energy-consuming enterprises, the main expenditure of production of caustic soda enterprise is the power consumption expense.The electricity consumption electricity charge of these enterprises are normally about the twice of photovoltaic generation rate for incorporation into the power network.Be subject to different converting plant technical merits simultaneously, the power factor of this class enterprise power consumption is generally about 0.9, and the not acting that this just means in the corporate spending electricity charge about 10% has been consumed in vain.The power expanding approval process of this class high energy-consuming enterprises is very complicated and restriction is harsh in addition, and the dilatation cost is also high.Therefore press for other alternative energy sources energy source as a supplement, photovoltaic generation is exactly a kind of good selection.But existing photovoltaic current transformer hardware circuit can't be realized the simple and high-efficient direct current function that is incorporated into the power networks.
The utility model content
Technical problem to be solved in the utility model is to solve existing photovoltaic current transformer hardware circuit can't realize the be incorporated into the power networks problem of function of simple and high-efficient direct current.
In order to solve the problems of the technologies described above, the technical scheme that the utility model adopts provides a kind of photovoltaic DC bus grid-connecting apparatus, its input and output join with photovoltaic module square formation and dc bus respectively, be connected to detect the insulation monitor whether the photovoltaic module square formation has enough insulation property over the ground on the described input, described insulation monitor rear end connects a BUCK circuit that is used for to the direct current energy step-down, the described BUCK circuit other end is connected with switching-off device, the described switching-off device other end is connected with described output, direct current energy after the step-down enters dc bus by output, also is provided with the grid-connection control device that its coherent signal is sampled and handled on the described BUCK circuit.
In above-mentioned photovoltaic DC bus grid-connecting apparatus, also be connected with man-machine interface on the described grid-connection control device and be the accessory power supply of the two power supply.
The photovoltaic DC bus grid-connecting apparatus that the utility model provides has reduced grid-connected inversion link, has improved system effectiveness, simultaneously because the grid-connecting apparatus device reduces, so system reliability also strengthens to some extent, can realize the simple and high-efficient direct current function that is incorporated into the power networks.
Description of drawings
The structural representation of the photovoltaic DC bus grid-connecting apparatus that Fig. 1 provides for the utility model;
The grid-connection control device signal circuit figure that Fig. 2 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is made detailed explanation.
As shown in Figure 1, input and the output of the photovoltaic DC bus grid-connecting apparatus that the utility model provides join with photovoltaic module square formation and dc bus respectively, and left end is input among the figure, and right-hand member is output.Be connected to detect the insulation monitor whether the photovoltaic module square formation has enough insulation property over the ground on the input, whether this device is used for measuring the DC component square formation that inverter connects enough insulation property over the ground, if insulation property inadequately then inverter can not insert direct current network.The insulation monitor rear end connects a BUCK circuit that is used for to the direct current energy step-down, and the BUCK circuit other end is connected with switching-off device, and the switching-off device other end is connected with described output, and the direct current energy after the step-down enters dc bus by output.Also be provided with the grid-connection control device that its coherent signal is sampled and handled on the BUCK circuit, this device also provides the driving signal of relevant defencive function and switching device.
Also be connected with man-machine interface on the grid-connection control device and be the accessory power supply of the two power supply, man-machine interface has information demonstration, button operation and communication function, and man-machine interface is provided with PORT COM.
Fig. 2 is the grid-connection control device signal circuit figure of system.The native system penetralia is electric current loop as can be seen from this figure, and the optimum output quality of power supply like this can assurance device be arranged, i.e. current ripples coefficient minimum, and the electric current that guarantees to send into dc bus has the current ripples coefficient less than 0.5%.The electric current loop skin is Voltage loop, and Voltage loop can be followed the fluctuation of direct current voltage on line side for the voltage of control system input side.The outermost of system is power ring, and power ring is used for the MPPT maximum power point tracking function of the system that realizes, this function has guaranteed that the photovoltaic module that inserts this device can work in maximum power point.Be that system can send the power output of solar energy system into dc bus as far as possible.All have the PI controller in three control rings, level and smooth stable in order to guarantee control.
The application of the utility model by photovoltaic DC bus grid-connection device can realize the simple and high-efficient direct current function that is incorporated into the power networks.Photovoltaic manufacturing enterprise and power station owner enterprise and whole electrical network all can obviously benefit, and receive the effect of achieving many things at one stroke, and be specific as follows:
Because the electricity price difference, the photovoltaic plant pay off period of same scale obviously shortens, and the prognosis income significantly increases.
Reduce grid-connected inversion link, improved system effectiveness.While is owing to the grid-connecting apparatus device reduces, so system reliability also strengthens to some extent.
Because the photovoltaic electric energy is to introduce with the direct current form, can improve energy utilization rate, reduces reactive loss.
Photovoltaic plant produces electric energy and need not extremely to use electric unit by the long Distance Transmission of electrical network, has saved net capacity, has reduced loss.
The utility model is not limited to above-mentioned preferred forms, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.
Claims (2)
1. photovoltaic DC bus grid-connecting apparatus, its input and output join with photovoltaic module square formation and dc bus respectively, it is characterized in that, be connected to detect the insulation monitor whether the photovoltaic module square formation has enough insulation property over the ground on the described input, described insulation monitor rear end connects a BUCK circuit that is used for to the direct current energy step-down, the described BUCK circuit other end is connected with switching-off device, the described switching-off device other end is connected with described output, direct current energy after the step-down enters dc bus by output, also is provided with the grid-connection control device that its coherent signal is sampled and handled on the described BUCK circuit.
2. photovoltaic DC bus grid-connecting apparatus as claimed in claim 1 is characterized in that, also is connected with man-machine interface on the described grid-connection control device and is the accessory power supply of the two power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158612 CN203218880U (en) | 2013-04-01 | 2013-04-01 | Photovoltaic DC bus grid-connection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158612 CN203218880U (en) | 2013-04-01 | 2013-04-01 | Photovoltaic DC bus grid-connection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203218880U true CN203218880U (en) | 2013-09-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320158612 Expired - Fee Related CN203218880U (en) | 2013-04-01 | 2013-04-01 | Photovoltaic DC bus grid-connection apparatus |
Country Status (1)
| Country | Link |
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| CN (1) | CN203218880U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730909A (en) * | 2013-12-18 | 2014-04-16 | 山东华岳节能技术开发有限公司 | Communication base station solar energy direct-current grid-connection power generation DC-DC special control device and method |
-
2013
- 2013-04-01 CN CN 201320158612 patent/CN203218880U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730909A (en) * | 2013-12-18 | 2014-04-16 | 山东华岳节能技术开发有限公司 | Communication base station solar energy direct-current grid-connection power generation DC-DC special control device and method |
| CN103730909B (en) * | 2013-12-18 | 2016-12-07 | 国网山东省电力公司菏泽供电公司 | Communication base station solar DC generates electricity by way of merging two or more grid systems DC-DC specialized control equipment and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 Termination date: 20160401 |
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| CF01 | Termination of patent right due to non-payment of annual fee |