How should the photovoltaic power generation system should deal with lightning?

　　Author ：Iflowpower – Portable Power Station Supplier

The minimum impact voltage of the photovoltaic power system device is 1.0kV. When the lightning inductive voltage, the current is greater than the equipment tolerance, the equipment will cause equipment damage.

By decomposition, the first positive polarity lightning strike, the first negative light strike, the first negative light strike, the safety distance corresponding to the historical lightning wave is 5.1, 25.2, 50.

4, 9.8m, respectively. According to the above decomposition, the solar photovoltaic power generation system should set anti-straight mine devices according to the second type of lightning protection building, but also adopt anti-flash surge invasion and lightning protection electromagnetic pulse measures to make lightning strikes induced induced voltage, induction current control Within its tolerance.

Anti-straight hitting and grounding solar photovoltaic battery board protruding the plane 0.45m formed by the original lighting strip, to increase the flash protection power generation system. The flash can be protected by the flash lever, the line, and the network.

Since the battery board is large, the flash line is used, the flash network has a protective purpose, but the wire and mesh are set on the battery board. The shadow is blocked for a long time Battery board, seriously affect power generation efficiency. The highly suitable multi-independent flasher is arranged in the eaves of the building, the corner and the like are vulnerable to the lightning strike, the rod of the flale rod is 0.

5m, and the eaves are arranged every 5m, and the root angle is encrypted. The formed double poles and multi-pole protection will greatly reduce the height and quantity of the flash rod. The flash rod and the workshop have a reliable connection, between the aluminum alloy borders of the solar panel, and the metal bracket, and the adjacent battery panels are not less than 10 mm 2 multi-strand copper wires, forming a M-type grid structure.

The electrical path is constituted, and the lightning stream is passed well and transferred to the earth. Solar power grounding systems include lightning protection ground, safe and protective, direct-flowing functional grounding. Each of the grounding systems is difficult to independent, in order to prevent the ground potential counterattack between the ground systems, the equipment, metal components, concrete basic grounds, etc.

, constitute a shared grounding network, the arrangement of the ground network and The size is more tight than the specific ground resistance value, the grounding network should be used in the baseline or ring manual grounding network. The ground resistance value should be less than 1 &, the site-measured basic land network is 0.8 &, meeting requirements.

Anti-flashing current is based on the structure of the solar photovoltaic system and the thunder wave invasive pathway, which can be discharged in the line in the line, which can discharge the thunder, limit overvoltage, so that it is protected by protected equipment. Tolerance. At the flow box introduced in the lightning wave, the LPZ0 area is set to the SPD of type I classification test at the junction of the LPZ1 area, which is protected by level 1.

Installing the SPD of type II classification test at the controller as the second level protection, installing Level 3 SPD at the inverter. Install the level 4 SPD on the front end of the DC load and the AC load, as a final precision protection. SPDs for installing Class I test on the high pressure side of the transformer, the defensive grid side lightning wave introduces lightning high voltage waves.

Communication equipment and traffic box, controller, signal line between inverters Install adaptation signal surge protection device. Lightning protection electromagnetic pulse to reduce the surge of lightning strike electromagnetic pulses to generate the photovoltaic power generation system, first utilize the natural construction and lightning protection device, the lightning protection device, the lightning protection device, etc. The photovoltaic power system device, cabinet, and metal casing of the metal casing of the power supply cabinet are also closely constitute the device shield; secondly, the power cable of the photovoltaic system, the signal communication cable is laid or replaced with a shield cable, metal The tube or shield should be grounded at both ends and is connected at equal potentials through the lightningirening area.

The power supply between the LPZ0 area, the power supply, the communication device, the two ends of the metal tube wearing the signal line should be connected to the equipment metal casing, the distribution box and connected to the near lightning protection device. When each cable wiring should prevent a large area of ​​electromagnetic induction loop, lay the power supply line of different loops and operating voltages, and the signal lines are laid in different line slots, and the information system cable and lightning protection are maintained at a minimum of 1000mm level. Spacing and 300mm interleaving net.

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