System for monitoring operation condition of photovoltaic power station

Abstract

The invention discloses a system for monitoring the operation condition of a photovoltaic power station, and the system comprises a plurality of photovoltaic assembly strings and s busbar. The system also comprises a signal generation device, and a signal processing device. Each photovoltaic assembly string is formed by the series connection of a plurality of assemblies. The signal processing device comprises a plurality of pairs of ports, and each pair of ports comprises S+ and S-. Each photovoltaic assembly string is connected in series between the S+ and S-. A plurality of photovoltaic assembly strings are respectively in parallel connection with the plurality of pairs of ports. Each photovoltaic assembly string is connected to the busbar through the signal processing device. The signal generation device is in parallel connection with the assemblies. The signal generation device is used for collecting the voltage, capacitance and temperature of the assemblies, and transmits the voltage, capacitance and temperature to the signal processing device through disturbance currents. The signal processing device collects the currents of the photovoltaic assembly strings, decodes the signals of the signal generation device, gathers the current, voltage, capacitance and temperature of the assemblies, and transmits the current, voltage, capacitance and temperature of the assemblies to an upper computer. The system is low in cost, is long in service life, and does not need to change the topological structure of the photovoltaic power station.

Description

technical field [0001] The invention relates to a monitoring system for the operation status of a photovoltaic power station, which belongs to the technical field of photovoltaic module monitoring. Background technique [0002] Photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect at the semiconductor interface. The key element of this technology is the solar cell. After the solar cells are connected in series, they can be packaged and protected to form a large-area photovoltaic module, and then cooperate with power controllers and other components to form a photovoltaic power generation device. The working status and aging degree of photovoltaic modules affect the operating status and power generation efficiency of the entire photovoltaic power generation device, so it is particularly important to monitor the operating status of photovoltaic modules in real time. [0003] In existing appli...

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Problems solved by technology

[0003] In existing applications, most of them can only monitor the entire string, and cannot obtain the parameters of individual components; the monitoring system has a complex structure and requires the use of data acquisition units, DC-DC converters, 2G or 3G communication modules, PLC communication modules, etc. This leads to an increase in the cost of the monitoring system and a reduction in the service life, which further increases the construction and operation and maintenance costs of the entire photovoltaic power station

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