System for monitoring photovoltaic battery pack string

Abstract

The invention relates to a system for monitoring a photovoltaic battery pack string and belongs to the field of running and management of a photovoltaic power generation system. In a photovoltaic power station, photovoltaic battery packs are connected in series and then are connected with a header box according to specific conditions, photovoltaic battery pack strings are connected in parallel, and the header box is connected with a grid-connected inverter. When the typical problems of connection, dust accumulation, component obsolescence difference and the like in a photovoltaic battery occur, the efficiency of the photovoltaic power generation system is influenced, and a monitoring system is needed to be arranged in the header box to monitor the photovoltaic battery pack string. The monitoring system can effectively manage the photovoltaic power station by acquiring photovoltaic pack string parameters, and combining other system parameters of the power station to realize autodiagnosis and effectively identify the problem of the power station. The system comprises a singlechip system, a power supply circuit, a voltage detection circuit, a current detection circuit, an intelligent communication interface circuit, an electrical meter chip and the like. In the system, a large-scale integrated circuit is used, and the system has a small volume, is low in energy consumption, has high reliability, and realizes the capacity of continuously monitoring the photovoltaic pack string in the life of the photovoltaic power generation system when assembled in the photovoltaic header box.

Description

Technical field: [0001] The invention relates to the field of solar photovoltaic power generation, and realizes the measurement and operation management of photovoltaic cell component strings forming a solar photovoltaic cell array in a photovoltaic power station. Background technique: [0002] The main component of the photovoltaic power generation system is the photovoltaic cell array. In large-scale photovoltaic grid-connected power generation systems, in order to reduce the connection between battery components and grid-connected inverters, the components are effectively combined according to the specific conditions of the power generation system. Generally, 10 to 15 photovoltaic battery components are connected in series and then connected to the confluence. Connect the photovoltaic cell modules in series and parallel into a group through the fuse in the combiner box and the bus bar, and then use the switch to connect the output of the combiner box to the grid-connected...

AI Technical Summary

Problems solved by technology

In large-scale photovoltaic grid-connected power generation systems, in order to reduce the connection between battery components and grid-connected inverters, the components are effectively combined according to the specific conditions of the power generation system. Generally, 10 to 15 photovoltaic battery components are connected in series and then connected to the confluence. The box is connected to the bus bar through the fuse in the combiner box, and the photovoltaic cell modules are connected in series and parallel to form a group, and then the output of the combiner box is connected to the grid-connected inverter by the switch. The previous combiner box generally only provides the parallel connection of each module. Connection path and safety protection circuit, without monitoring capability

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