Device for acquiring voltage and current of capacitive photovoltaic cell

Abstract

The invention provides a device for acquiring the voltage and current of a capacitive photovoltaic cell. The device comprises a sampling module, a voltage signal measuring module, a current signal measuring module, an MCU (Microprogrammed Control Unit) signal processing module and a manual gear selecting module, wherein the manual gear selecting module is used for selecting a measured gear according to the parameters of a measured photovoltaic cell, a gear selecting signal is sent to the voltage signal measuring module and the current signal measuring module through the MCU signal processing module to determine the measured gear; the sampling module samples the acquired voltage and current signals of the output end of the photovoltaic cell and respectively transmits to the voltage signal measuring module and the current signal measuring module for amplification and filtration processing, and the processed signal is sent to the MCU signal processing module to be processed and then uploaded to superior monitoring equipment for use. The device provided by the invention has the advantages of simple circuit structure, lower cost, high sampling accuracy, short sampling period and good working stability, and is convenient to operate.

Description

technical field [0001] The invention relates to the technical field of voltage and current detection output by photovoltaic cells, in particular to a device for collecting voltage and current output by photovoltaic cells using capacitor charging and discharging technology. Background technique [0002] At present, the application of solar power generation is more and more extensive. In the process of solar power generation, it is necessary to sample the voltage and current output by photovoltaic cells in real time to meet the monitoring requirements of the upper-level system or power grid dispatching system. At present, the photovoltaic power station monitoring system is mainly provided by inverter manufacturers along with the equipment. Due to the large number of inverter manufacturers, each inverter factory starts from the inverter of its own factory and selects the corresponding photovoltaic cell voltage and current acquisition device. Manufacturers' products are not com...

AI Technical Summary

Problems solved by technology

At present, the photovoltaic power station monitoring system is mainly provided by inverter manufacturers along with the equipment. Due to the large number of inverter manufacturers, each inverter factory starts from the inverter of its own factory and selects the corresponding photovoltaic cell voltage and current acquisition device. Manufacturers' products are not compatible with each other, which brings difficulties to the actual monitoring of solar power plants; it is difficult to form a convenient and unified monitoring system for solar power plant monitoring

In addition, one of the main disadvantages of photovoltaic power generation is that the photoelectric conversion efficiency of solar cell arrays is too low. To solve this problem, an important way to solve this problem is to use maximum power point tracking (MPPT) technology to adjust the operating point of photovoltaic cells in real time. In order to maximize the output power of the photovoltaic cell array

The first step in the implementation of maximum power point tracking (MPPT) technology is to sample the voltage and current output by the photovoltaic cell array. However, the current sampling device has a relatively complex circuit structure, low sampling accuracy, and long sampling and measurement time. longer and less stable

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