CN-122000847-A - Lightning protection system of offshore floating photovoltaic power station and construction method thereof

CN122000847ACN 122000847 ACN122000847 ACN 122000847ACN-122000847-A

Abstract

The invention provides a lightning protection system of a floating photovoltaic power station at sea and a construction method thereof, relating to the technical field of lightning protection of photovoltaic power generation, wherein the system comprises a lightning protection device arranged at the top of the photovoltaic power station and used for guiding lightning current; the lightning protection system comprises a lightning protection system, a grounding device, an electromagnetic shielding device, a real-time monitoring device and a lightning protection system, wherein the grounding device is used for guiding lightning current into the grounding device, the grounding device comprises a grounding net and a vertical grounding electrode which are arranged around a floating body channel, the vertical grounding electrode is made of anti-corrosion materials and extends downwards from the grounding net to be driven into the seabed, the electromagnetic shielding device is arranged in a photovoltaic power station and used for reducing the transmission of lightning stroke charges, the real-time monitoring device comprises thunderstorm early warning equipment, grounding resistance testing equipment and induced voltage monitoring equipment and is used for dynamically monitoring lightning stroke events and triggering maintenance instructions, the technical problems of poor durability and low reliability of the lightning protection system of the marine floating photovoltaic power station are solved, and the effects of improving the operation safety, stability and maintainability of the lightning protection system are achieved.

Inventors

LU JIANLIN
GUO XIAOHUI
FENG WEIKANG
CHEN JIANJUN
WEN DONGBIN
QIN WEI
SHEN ZHIJUN
XIAO JIN
JI YUANQING
LENG PENG
ZHANG ZHEN
WU YANGYANG
WANG YUFEI

Assignees

华能(浙江)能源开发有限公司清洁能源分公司
中国华能集团清洁能源技术研究院有限公司
华能浙江苍南海上风电有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (10)

1. An offshore floating photovoltaic power plant lightning protection system, comprising: the lightning protection device comprises a lightning rod arranged at the top of the photovoltaic power station and used for guiding lightning current; The down-conduction system is used for guiding the lightning current guided by the lightning receiving protection device to the grounding device; The grounding device comprises a grounding grid and a vertical grounding electrode, wherein the grounding grid is arranged around a floating body channel, the vertical grounding electrode is made of anti-corrosion materials, and the vertical grounding electrode extends downwards from the grounding grid and is driven into the sea bottom; The electromagnetic shielding device is arranged in the photovoltaic power station and is used for reducing the transmission of lightning stroke charges; The real-time monitoring device comprises thunderstorm early warning equipment, grounding resistance testing equipment and induced voltage monitoring equipment and is used for dynamically monitoring lightning stroke events and triggering maintenance instructions.
2. The system of claim 1, wherein the grounding device further comprises a plurality of vertical grounding poles corresponding to the number of vertical grounding poles, and the plurality of vertical grounding poles are annularly arranged.
3. The system of claim 1, wherein the corrosion resistant material used for the vertical grounding electrode is a stainless steel magnesium alloy, and wherein the minimum cross-sectional area of the vertical grounding electrode is determined based on the lightning current peak value, the duration and the material coefficient.
4. The system of claim 3, wherein the vertical grounding electrode is externally coated with a corrosion-resistant plastic-coated copper plating layer, and the grounding grid is fixedly connected to the sea floor by a floating body anchoring system.
5. The system of claim 1, further comprising a lightning protection design flow module for performing the following operations: determining a grounding form based on geological exploration data on environmental conditions and lightning risk assessment; insulating measures are implemented on the floating body, including hull painting, grounding device cleaning and insulating material paving around high-voltage equipment; and installing a lightning rod and optimizing the layout of the down-conducting system according to the risk assessment result.
6. The system of claim 1, wherein the electromagnetic shield comprises a horizontal ground wire disposed within the float, wherein a corrosion resistant plastic coated protective layer is disposed outside the horizontal ground wire and is in electrical communication with the panel support.
7. The system of claim 1, wherein the down-draw system is made of copper-clad steel or ground cable material, and a ground trunk is provided around each floating matrix.
8. The system of claim 1, wherein the real-time monitoring device further comprises a lightning strike recording unit and a predictive maintenance unit; The lightning stroke recording unit is used for recording historical lightning stroke data, the predictive maintenance unit is used for generating maintenance early warning based on the historical lightning stroke data and the equipment aging model, and the maintenance early warning comprises target maintenance equipment and maintenance time.
9. The system of claim 1, wherein the lightning rod height and layout of the lightning protection device are dynamically optimized based on marine lightning activity data.
10. The construction method of the lightning protection system of the offshore floating photovoltaic power station is characterized by comprising the following steps of: The lightning protection device is installed, and comprises a lightning rod arranged at the top of a photovoltaic power station to guide lightning current; Arranging a down-conduction system, and guiding the lightning current guided by the lightning receiving protection device to a grounding device; the method comprises the steps of constructing a grounding device, wherein a grounding net and a vertical grounding electrode are arranged around a floating body channel, the vertical grounding electrode is made of anti-corrosion materials, and extends downwards from the grounding net to be driven into the sea bottom to form a low-impedance diffusion path; An electromagnetic shielding device is arranged in the photovoltaic power station to reduce the transmission of lightning stroke charges; The integrated real-time monitoring device comprises thunderstorm early warning equipment, grounding resistance testing equipment and induced voltage monitoring equipment, so as to dynamically monitor lightning stroke events and trigger maintenance instructions.

Description

Lightning protection system of offshore floating photovoltaic power station and construction method thereof Technical Field The invention relates to the technical field of lightning protection of photovoltaic power generation, in particular to a lightning protection system of an offshore floating photovoltaic power station and a construction method thereof. Background With the rapid development of photovoltaic power generation technology, an offshore floating photovoltaic power station gradually becomes an important direction for new energy application due to the advantages of land resource saving, water evaporation reduction and the like. However, the marine environment has the characteristics of high salt fog, strong corrosion, complex dynamic floating and deep sea dispersion, and the like, and provides a serious challenge for the lightning protection system. The existing lightning protection technology is designed aiming at land or fixed ocean structures (such as offshore wind power foundation), and conventional means such as a grounding grid, a lightning rod and the like are generally adopted, but the scheme is difficult to directly adapt to an offshore floating scene. For example, the traditional grounding system relies on soil dispersion, seawater in the marine environment is high in conductivity but high in corrosiveness, rapid aging of metal components is easy to occur, the stability of a down-conducting path is poor due to the structural dynamic characteristics of a floating platform, and the lightning current dredging efficiency is low. In addition, the existing lightning protection design is multi-focusing and single-link (such as grounding or lightning receiving), lacks cooperative protection on the full link risk of the marine environment, does not incorporate a standardized calculation flow, depends on empirical design, and is not reliable enough. In particular to the field of floating photovoltaics, although the prior art tries to realize grounding through an anchoring system (such as connection with a lake bottom by utilizing an anchor block), the scheme mainly aims at fresh water environments such as lakes, and the like, has weak material corrosion resistance and simple flow dispersion design, and cannot cope with the requirements of ocean high salt spray corrosion and deep sea flow dispersion. Meanwhile, the existing lightning protection system often neglects real-time monitoring and dynamic maintenance, so that the lightning protection performance is attenuated in long-term operation. The lightning activity in the marine environment is frequent and strong, the defects are further amplified, and safety accidents such as equipment damage, system paralysis and the like are easily caused. Disclosure of Invention The invention aims to provide a lightning protection system of an offshore floating photovoltaic power station and a construction method thereof, so as to solve the technical problems of poor durability and low reliability of the existing lightning protection system of the offshore floating photovoltaic power station. According to a first aspect, the embodiment of the invention provides a lightning protection system of an offshore floating photovoltaic power station, which comprises a lightning protection device, a down-conduction system, a grounding device, an electromagnetic shielding device and a real-time monitoring device, wherein the lightning protection device comprises a lightning rod arranged at the top of the photovoltaic power station and used for guiding lightning current, the down-conduction system is used for guiding the lightning current guided by the lightning protection device into the grounding device, the grounding device comprises a grounding net and a vertical grounding electrode, the grounding net is arranged around a floating body channel, the vertical grounding electrode is made of an anti-corrosion material and extends downwards from the grounding net to be driven into the sea bottom, the electromagnetic shielding device is arranged inside the photovoltaic power station and used for reducing transmission of lightning charge, and the real-time monitoring device comprises lightning early warning equipment, grounding resistance testing equipment and induced voltage monitoring equipment and is used for dynamically monitoring lightning event and triggering maintenance instructions. In some optional implementations, the grounding device further includes a plurality of vertical grounding poles, and the plurality of vertical grounding poles are annularly arranged. In some alternative implementations, the corrosion-resistant material used for the vertical grounding electrode is stainless steel magnesium alloy, and the minimum sectional area of the vertical grounding electrode is determined based on the lightning current peak value, the duration time and the material coefficient. In some alternative implementations, the vertical grounding electrode is externally coated