Photovoltaic cell module voltage measurement device based on differential switch array and voltage measurement method

Abstract

The invention discloses a photovoltaic cell module voltage measurement device based on a differential switch array, and provides a device and a measuring method capable of realizing the measurement ofoperating parameters of a photovoltaic cell module of a photovoltaic power station. The photovoltaic cell module voltage measurement device comprises a photovoltaic cell module stack (1), the differential switch array (2), a serial shift register (3), an absolute value circuit (4), a bus wire 1 and a bus wire 2; and the photovoltaic cell module stack (1) is composed of m photovoltaic cell modules. According to the photovoltaic cell module voltage measurement device based on the differential switch array provided by the invention, the differential switch array (2) is constructed, and the bus wire 1, the bus wire 2 and the absolute value circuit (4) are combined to form a differential structure for measuring the voltage; and the differential structure can eliminate common-mode signals whenmeasuring the voltage of the photovoltaic cell modules, and solves the problem that the voltage measurement of a series photovoltaic cell module is difficult.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a voltage measurement device and a voltage measurement method for a photovoltaic battery module based on a differential switch array. Background technique [0002] As a future energy supply industry, the solar photovoltaic energy industry has important practical and strategic significance under the vigorous promotion of the state. In the application of solar photovoltaic power generation, the photovoltaic cell module is the key device to realize photoelectric energy conversion. In order to match with the inverter, the photovoltaic cell module usually needs to be connected in series and parallel to form a photovoltaic cell stack before it can work normally. However, due to changes in the state of the photovoltaic cell module and external conditions (light intensity, ambient temperature, etc.), its output power characteristics will change, and internal units w...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large common-mode signal and difficulty in detecting real-time operating parameters of photovoltaic cell components due to the fact that photovoltaic cell components need to be connected in series to form battery stacks during the detection of photovoltaic cell components in current photovoltaic power stations. A device and measurement method capable of measuring operating parameters of photovoltaic cell components in a photovoltaic power station. The device has a simple and reliable structure and solves the problem of basic data acquisition in the operation and maintenance of photovoltaic power plants

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