Photovoltaic terminal box and photovoltaic system

Abstract

The invention discloses a photovoltaic terminal box and a photovoltaic system. The photovoltaic terminal box comprises a main terminal box and at least one auxiliary terminal box, which are corresponding to the same photovoltaic component. The photovoltaic component comprises at least two battery piece sub-strings, the output ends of which are serially connected together. The main terminal box is corresponding to one battery piece sub-string, and every auxiliary terminal box is corresponding to one battery piece sub-string. The two input ends of the main terminal box are connected with the positive pole and the negative pole of the battery piece sub-string, and the two input ends of every auxiliary terminal box are connected with the positive pole and the negative pole of the battery piece sub-string. The main terminal box comprises an open circuit switch, and one auxiliary terminal box comprises a short circuit switch, and other auxiliary terminal boxes comprise short circuit switches or open circuit switches. The open circuit switches are serially connected with the output ends of the corresponding battery piece sub-strings. The short circuit switches are parallely connected with the output ends of the corresponding battery piece sub-strings. The main terminal box is used to control the connecting of the short circuit switches and the disconnecting of the open circuit switches, when a turn-off instruction is received. The photovoltaic component is protected, and production technology is simple, and costs are low.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic junction box and a photovoltaic system. Background technique [0002] Photovoltaic power generation technology, as a renewable energy power generation technology, has been widely used at home and abroad. The photovoltaic array outputs direct current, which is converted into alternating current by the inverter, and clean energy can be transmitted to the grid. However, with the continuous expansion of the photovoltaic industry, the probability of accidents is also increasing. [0003] The photovoltaic array in series has a very high voltage. In order to improve the safety of the photovoltaic system, NEC2017 (American Electrician Act 2017) puts forward the requirements for rapid shutdown (Rapid Shutdown) of the photovoltaic system: [0004] 1) If the inverter is installed 305mm away from the battery panel or more than 1 meter away from the cond...

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Problems solved by technology

[0010] figure 2 The disadvantage of the shutdown device shown is that the three junction boxes are placed separately, correspondingly three shutdown devices are required, and a total of 8 wires need to be connected to the three junction boxes from the photovoltaic module, so there are too many wire harnesses, the manufacturing process is complicated, and the cost high

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