A measuring instrument and measuring method for DC power generation characteristics of a photovoltaic module array

Abstract

The present invention discloses a measuring instrument of a photovoltaic assembly array DC generating characteristic and a measurement method thereof. The measuring instrument of the photovoltaic assembly array DC generating characteristic is used to measure a DC generating characteristic of a photovoltaic assembly array in a solar photovoltaic power generation system and comprises a body, a control panel is arranged on the body, and a static measurement device used for measuring an open-circuit output voltage and a short-circuit output current and a dynamic measurement device used for measuring a current-voltage characteristic are arranged in the body. When the instrument and method of the present invention are used, the open-circuit output voltage, the short-circuit output current, a maximum output power, a filling coefficient and the voltage and current which generate a maximum power point are obtained by the static measurement and the dynamic measurement. The instrument and method of the present invention enable the power measurement range to be increased, deduce the maximum power measured on a laboratory standard condition by the on-site measured maximum power, and have the very good popularization and application prospect.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a measuring instrument and a measuring method for the DC power generation characteristics of a photovoltaic module array. Background technique [0002] Solar power generation is divided into photothermal power generation and photovoltaic power generation. Generally speaking, solar power generation refers to solar photovoltaic power generation, referred to as "photoelectricity". 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. The solar cells are packaged and protected after being connected in series to form a large-area solar cell module, and then cooperate with power controllers and other components to form a photovoltaic power generation device. A photovoltaic power station is a sy...

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Problems solved by technology

[0006] (1) The power measurement range is too small, only 10kW can be measured;

[0007] (2) Only the voltage-current curve function (dynamic parameters) can be measured; the measurement principle of capacitance charge and discharge recommended by international standards belongs to the non-international system of units (SI unit) because the measurement result is a voltage-current curve function. At present, no corresponding calibration and value traceability system has been established; therefore, instruments of this kind of working principle cannot be measured and calibrated at present, so the data will cause doubts and even contract disputes;

[0008] (3) The current measuring instruments all use industrial control computers for sampling control and LCD touch screen operation. Practice shows that in open-air workplaces, strong sunlight makes the LCD screen data unclear, and the power consumption is too large, unless a specific battery, otherwise it will be difficult to work all day

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