Distributed photovoltaic power station monitoring system and fault diagnosis method thereof

Abstract

The invention discloses a distributed photovoltaic power station monitoring system. The distributed photovoltaic power station monitoring system comprises a photovoltaic array, a data monitoring unit, a data acquisition unit, a data processing unit and a power supply unit; the data monitoring unit comprises a DC monitoring unit and an AC monitoring unit; the DC monitoring unit comprises a hall voltage sensor and a hall current sensor; the AC monitoring unit comprises an AC electrical quantity transducer; the data acquisition unit comprises a CPU, a memory, a plurality of meteorological sensors, a temperature sensor for detecting the working temperature of a battery module, and an analog-digital converter; the data processing unit is in two-way signal connection with the CPU by use of a communication module; the data processing unit is further in wireless connection with the system monitoring terminal. The invention also provides a fault diagnosis method of the distributed photovoltaic power station monitoring system; based on the simulation result of the data processing unit, the photovoltaic array captures losses, the system losses, the current ratio and the voltage ratio to perform fault analysis and diagnosis; the diagnosis method is simple and the diagnosis results are accurate and reliable.

Description

technical field [0001] The invention relates to a distributed photovoltaic power station monitoring system, and also relates to a fault diagnosis method of the distributed photovoltaic power station monitoring system, which belongs to the technical field of photovoltaic power generation. Background technique [0002] With the global warming and the continuous consumption of energy mainly composed of fossil fuels, the development of new energy sources such as solar energy, water energy, and wind energy has become a top priority. In recent years, the domestic solar photovoltaic industry has developed rapidly, and the number of photovoltaic power stations that have been built or are under construction in the country is also increasing rapidly. How to comprehensively and timely effectively monitor distributed power stations, accurately evaluate their performance and realize fault diagnosis , has become a crucial issue. [0003] At present, the distribution of distributed photov...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a distributed photovoltaic power station monitoring system, solve the technical problems in the prior art that the distributed photovoltaic power station is inconvenient to monitor, and cannot accurately reflect the system operating status and fault diagnosis

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