Photovoltaic alternate current and direct current intelligent distribution box

Abstract

Provided is a photovoltaic alternate current and direct current intelligent distribution box. The photovoltaic alternate current and direct current intelligent distribution box has photovoltaic module junction, direct current side detection and protection and alternate current side monitoring and anti-islanding functions, and is mainly used for distribution for grid-connected photovoltaic systems of small and medium sizes. The intelligent distribution box can be connected with photovoltaic strings of eight branches, an input circuit is connected with a fuse, a blocking diode, a high-voltage lightning arrester and a disconnector, and therefore various protection effects on the direct current side can be achieved. A series relay can adjust photovoltaic string number connected with an inverter according to system power requirements, inspect current and voltage output by direct current after each string input and junction and provide direct current output of two branches, and can be connected with the distribution box after the inverter boosts inversion filtering, detect output current and voltage of the inverter and network voltage in real time, and therefore an overvoltage / undervoltage state, current protection and anti-islanding strategy can be achieved. When trouble signals exist in a system, a relay on the alternate current side can automatically cut out power supply for a power grid. The photovoltaic alternate current and direct current intelligent distribution box is multiple in protection function, high in system safety and economical and practical by adopting an integrated structure in design.

Description

technical field [0001] The invention relates to an integrated distribution box with the functions of confluence of photovoltaic modules, DC side detection and protection, and AC side monitoring and anti-islanding functions, belonging to the technical field of solar photovoltaic power generation. Background technique [0002] At this stage, the construction of national solar power generation projects is in full swing, photovoltaic arrays installed on buildings for distributed power generation, and small and medium-sized power station projects such as building integrated photovoltaics (BIPV) or solar roofs are particularly popular. The grid-connected photovoltaic power generation system is mainly composed of photovoltaic arrays, combiner boxes, DC cabinets, inverters, and AC cabinets. String inverters are suitable for small and medium-sized power station projects, with high power generation and stable operation. Usually, there are 1 or 2-way maximum power peak tracking. [00...

AI Technical Summary

Problems solved by technology

However, the current combiner boxes, DC cabinets, and AC cabinets are bulky, complicated to operate, and expensive. In particular, the combiner box only provides a single DC output, and cannot automatically adjust the number of input strings according to the system power requirements. It is not suitable for strings. inverter

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