Method for monitoring performance of photovoltaic power station in real time

Abstract

The invention discloses a method for monitoring the performance of a photovoltaic power station in real time. The method comprises the steps of: (1) collecting voltage V1 and current I1 of direct current outputted by a photovoltaic array in the photovoltaic power station, and calculating direct current power P1 by using the voltage V1 and the current I1; (2) collecting voltage V11 and current I11 of alternating current formed by the direct current outputted by the photovoltaic array after being inverted, and calculating alternating current power P11 by using the voltage V11 and the current I11; (3) acquiring a photovoltaic assembly with the same specifications as the formed photovoltaic array, collecting voltage V0 and current I0 of direct current outputted by the photovoltaic assembly, and calculating direct current power P0 by using the voltage V0 and the current I0; (4) collecting voltage V01 and current I01 of alternating current formed by the direct current outputted by the photovoltaic assembly after being inverted, and calculating alternating current power P01 by using the voltage V01 and the current I01; and (5) judging whether the performance of the photovoltaic array is normal or not according to the collected or calculated relevant data of the photovoltaic array and the photovoltaic assembly in steps (1)-(4). The method disclosed by the invention is conducive to operation management of the performance of the photovoltaic power station.

Description

technical field [0001] The present invention relates to the field of photovoltaic power stations, in particular to a method for real-time performance monitoring of photovoltaic power stations that can provide reliable information for accurately judging the operating status of photovoltaic power stations, so as to diagnose causes and repair and maintain in time, and is beneficial to the operation and management of grid-connected photovoltaic power stations . Background technique [0002] With the development of modern industry, the global energy demand is increasing and the environmental pollution problem is becoming more and more serious. Therefore, the contradiction between energy demand and environmental problems has become the key to restrict the sustainable development of modern industry. Solar energy, as a green energy, is inexhaustible and has become the first choice for human beings to develop renewable green energy. Solar power can flexibly convert solar energy into...

AI Technical Summary

Problems solved by technology

However, there is a method of calculating the theoretical power generation of a photovoltaic power station by combining the solar irradiance, the temperature of the photovoltaic power station inside the module and the total power of the photovoltaic module, and then comparing the actual power generation with the theoretical power generation to verify the power generation performance of the photovoltaic power station. The reason is that the calculation value error of the theoretical power generation is too large, and the reason for the excessive error is the irradiance measurement error, dust occlusion, theoretical calculation formula error, etc.

Once the overall performance of the photovoltaic power station declines, managers cannot find problems from the monitoring data

The existing photovoltaic power station monitoring system cannot judge whether the photovoltaic power station is working normally, and cannot provide system abnormality reminders for the management of photovoltaic power stations

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