CN210156931U - Distributed photovoltaic grid-connected power generation system with electrical interlocking device - Google Patents
Distributed photovoltaic grid-connected power generation system with electrical interlocking device Download PDFInfo
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- CN210156931U CN210156931U CN201920836992.XU CN201920836992U CN210156931U CN 210156931 U CN210156931 U CN 210156931U CN 201920836992 U CN201920836992 U CN 201920836992U CN 210156931 U CN210156931 U CN 210156931U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The utility model discloses a distributed photovoltaic grid-connected power generation system with an electrical interlocking device, which comprises a low-voltage photovoltaic incoming cabinet, a grid-connected transformer and a high-voltage grid-connected cabinet which are connected in sequence; a low-voltage circuit breaker is arranged on a line in the low-voltage photovoltaic incoming cabinet, a high-voltage vacuum circuit breaker is arranged on a line in the high-voltage grid-connected cabinet, and an electric interlocking device which enables the low-voltage circuit breaker and the high-voltage vacuum circuit breaker to be linked is arranged between the low-voltage circuit breaker and the high-voltage vacuum circuit breaker. According to the technical scheme, the electric interlocking device is arranged in the switching-on and switching-off control circuit of the high-low circuit breaker, after the power grid breaks down or is interrupted, the high-voltage side circuit breaker is protected and tripped, the switching-off of the grid-connected low-voltage side circuit breaker is guaranteed, the photovoltaic grid-connected power generation system cannot continue to supply power to the load independently, and therefore the islanding effect is prevented more effectively. The scheme can be realized only by adding the wiring of the electrical interlock in the high-low voltage circuit breaker in the high-low voltage electrical part of the 10kV distributed photovoltaic grid-connected power generation system, and has higher economic benefit.
Description
Technical Field
The utility model relates to a grid-connected PV power generation system field, especially a distributed grid-connected PV power generation system who possesses electrical interlock.
Background
Energy conservation, emission reduction and environmental protection are basic national policies, and the guarantee of sustainable development of national economy is to greatly promote energy conservation, emission reduction and deep development of green energy. Solar energy is used as primary energy and also is renewable energy, the solar energy is rich in resources, can be used freely, has no environmental pollution, is highly valued by the nation in research and application, develops a series of preferential policies and regulations, and promotes the application of solar power generation. The application of the distributed photovoltaic grid-connected power generation system in the power grid is increasingly wide, and when the distributed photovoltaic grid-connected power generation system is connected to a 10kV power distribution network in a T mode, a grid-connected protection device is generally adopted on a high-voltage side for grid-connected connection and disconnection. Under the condition of grid fault or interruption, the solar photovoltaic power generation system continues to independently supply power to the load, and the phenomenon is called 'island effect'. If the phenomenon occurs, the safety of maintenance personnel is threatened when the grid fault is repaired.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a prevent island effect's distributed photovoltaic grid-connected power generation system.
The utility model adopts the technical scheme as follows:
a distributed photovoltaic grid-connected power generation system with an electrical interlocking device comprises a low-voltage photovoltaic incoming cabinet, a grid-connected transformer and a high-voltage grid-connected cabinet which are sequentially connected;
the photovoltaic power supply line is characterized in that a low-voltage circuit breaker is arranged on a line in the low-voltage photovoltaic power supply line cabinet, a high-voltage vacuum circuit breaker is arranged on a line in the high-voltage grid-connected cabinet, and an electric interlocking device for enabling the low-voltage circuit breaker and the high-voltage vacuum circuit breaker to be linked is arranged between the low-voltage circuit breaker and the high-voltage vacuum circuit breaker.
Further, the electric interlocking device comprises an auxiliary contact at the opening position in the high-voltage vacuum circuit breaker and an opening coil of the low-voltage vacuum circuit breaker which are connected in series, wherein when the vacuum circuit breaker is at the opening position, the auxiliary contact at the opening position is in a normally-closed state; when the vacuum circuit breaker is in a switching-on position, the auxiliary contact at the switching-off position is in a normally open state; and the low-voltage breaker opening coil is used for driving the low-voltage breaker to open after being electrified.
Furthermore, the electric interlocking device also comprises a first miniature circuit breaker connected between a control power supply and the opening position auxiliary contact, and a second miniature circuit breaker connected between the control power supply and the opening coil of the low-voltage circuit breaker.
The utility model has the advantages that: according to the technical scheme, the electric interlocking device is arranged in the switching-on and switching-off control circuit of the high-low circuit breaker, after the power grid breaks down or is interrupted, the high-voltage side circuit breaker is protected and tripped, the switching-off of the grid-connected low-voltage side circuit breaker is guaranteed, the photovoltaic grid-connected power generation system cannot continue to supply power to the load independently, and therefore the islanding effect is prevented more effectively. The scheme can be realized only by adding the wiring of the electrical interlock in the high-low voltage circuit breaker in the high-low voltage electrical part of the 10kV distributed photovoltaic grid-connected power generation system, and has higher economic benefit.
Drawings
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a frame diagram of a distributed grid-connected photovoltaic power generation system of the present invention;
fig. 2 is an electrical diagram of the electrical interlock device of the present invention.
Detailed Description
As shown in fig. 1, the distributed photovoltaic grid-connected power generation system with an electrical interlock apparatus of the present invention includes a low voltage photovoltaic inlet cabinet 100, a grid-connected transformer 200 and a high voltage grid-connected cabinet 300, which are connected in sequence;
the low-voltage photovoltaic incoming cabinet is characterized in that a low-voltage circuit breaker QF1 is arranged on a circuit in the low-voltage photovoltaic incoming cabinet 100, a high-voltage vacuum circuit breaker DL is arranged on a circuit in the high-voltage grid-connected cabinet 300, and an electric interlocking device which enables the low-voltage circuit breaker QF1 and the high-voltage vacuum circuit breaker DL to be linked is arranged between the low-voltage circuit breaker QF1 and the high-voltage.
The principle of the technical scheme is that an electrical interlocking device is designed through a high-low voltage side circuit breaker switching-on and switching-off control circuit in a photovoltaic grid-connected power generation system, so that after a power grid breaks down or is interrupted, a vacuum circuit breaker DL at a high voltage side is tripped, and a low-voltage circuit breaker QF1 at a grid-connected low voltage side must be switched off, and the purpose of preventing an island effect is achieved.
As a specific implementation manner of this embodiment, as shown in fig. 2, the electrical interlock device includes an auxiliary contact for an opening position in the high voltage vacuum circuit breaker DL, and an opening coil of the low voltage circuit breaker QF1, which are connected in series, wherein when the vacuum circuit breaker DL is in the opening position, the auxiliary contact for the opening position DL is in a normally closed state; when the vacuum circuit breaker DL is in a switching-on position, the auxiliary contact DL in the switching-off position is in a normally open state; and the low-voltage circuit breaker QF1 opening coil is used for driving the low-voltage circuit breaker QF1 to open after being electrified.
When the vacuum circuit breaker DL works normally, the high-voltage side vacuum circuit breaker DL is in a closing state, the auxiliary contact at the opening position of the vacuum circuit breaker DL is disconnected, the high-voltage locking loop does not act, and the low-voltage circuit breaker QF1 opening loop is disconnected; when the power grid is in fault or is in abnormal conditions such as interruption and the like, the vacuum circuit breaker DL is in a protection opening state, the opening position contact is changed into normal close, the high-voltage locking loop acts, the opening electric loop of the low-voltage circuit breaker is connected, and the circuit breaker QF1 is disconnected;
in addition, the electric interlocking device also comprises a first miniature circuit breaker F1 connected between a control power supply and the opening position auxiliary contact, and a second miniature circuit breaker F2 connected between the control power supply and the opening coil of the low-voltage circuit breaker QF 1.
The above is only the preferred embodiment of the present invention, the present invention is not limited to the above embodiment, and the technical solution of the present invention is all within the protection scope of the present invention as long as the present invention is realized by the substantially same means.
Claims (3)
1. The utility model provides a distributed photovoltaic grid-connected power generation system that possesses electrical interlock which characterized in that: the system comprises a low-voltage photovoltaic incoming cabinet, a grid-connected transformer and a high-voltage grid-connected cabinet which are sequentially connected;
the photovoltaic power supply line is characterized in that a low-voltage circuit breaker is arranged on a line in the low-voltage photovoltaic power supply line cabinet, a high-voltage vacuum circuit breaker is arranged on a line in the high-voltage grid-connected cabinet, and an electric interlocking device for enabling the low-voltage circuit breaker and the high-voltage vacuum circuit breaker to be linked is arranged between the low-voltage circuit breaker and the high-voltage vacuum circuit breaker.
2. The distributed grid-connected photovoltaic power generation system with the electrical interlocking device according to claim 1, characterized in that: the electric interlocking device comprises an auxiliary contact at the opening position in the high-voltage vacuum circuit breaker and an opening coil of the low-voltage vacuum circuit breaker which are connected in series, wherein when the vacuum circuit breaker is at the opening position, the auxiliary contact at the opening position is in a normally closed state; when the vacuum circuit breaker is in a switching-on position, the auxiliary contact at the switching-off position is in a normally open state; and the low-voltage breaker opening coil is used for driving the low-voltage breaker to open after being electrified.
3. The distributed grid-connected photovoltaic power generation system with the electrical interlocking device according to claim 2, characterized in that: the electric interlocking device further comprises a first miniature circuit breaker connected between a control power supply and the opening position auxiliary contact, and a second miniature circuit breaker connected between the control power supply and the opening coil of the low-voltage circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920836992.XU CN210156931U (en) | 2019-06-04 | 2019-06-04 | Distributed photovoltaic grid-connected power generation system with electrical interlocking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920836992.XU CN210156931U (en) | 2019-06-04 | 2019-06-04 | Distributed photovoltaic grid-connected power generation system with electrical interlocking device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210156931U true CN210156931U (en) | 2020-03-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920836992.XU Active CN210156931U (en) | 2019-06-04 | 2019-06-04 | Distributed photovoltaic grid-connected power generation system with electrical interlocking device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210156931U (en) |
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2019
- 2019-06-04 CN CN201920836992.XU patent/CN210156931U/en active Active
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Address after: No.1, Hengmen Xingye West Road, Nanlang Town, Zhongshan City, Guangdong Province, 528400 Patentee after: Guangdong Mingyang Electric Co.,Ltd. Address before: No.1, Hengmen Xingye West Road, Nanlang Town, Zhongshan City, Guangdong Province, 528400 Patentee before: Guangdong Mingyang Electric Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |