IV scanning method, device and system

Abstract

The invention discloses an IV scanning method, device and system, and the method comprises the steps: obtaining a current meteorological parameter and the actual maximum output power of a photovoltaic inverter through a controller under the triggering condition of receiving an IV scanning starting instruction, obtaining the current theoretical output power of a photovoltaic module based on the current meteorological parameter, and transmitting the current theoretical output power to the controller, when the current theoretical output power of the photovoltaic module is greater than the actual maximum output power of the photovoltaic inverter, that is, the photovoltaic inverter works in a limited power state, calculating a target adjustment angle of the photovoltaic module when the photovoltaic inverter works at a limited power critical point, and after the inclination angle of the photovoltaic module is adjusted to the target adjustment angle, sending an IV scanning instruction to an IV scanning device, so that the IV scanning device executes an IV scanning function according to the IV scanning instruction, and at the moment, the IV scanning device can scan all IV data, so that a complete IV curve can be obtained, effective diagnosis on whether a photovoltaic module has a fault or not is realized, and normal operation and maintenance management of a photovoltaic power station is ensured.

Description

technical field [0001] The present invention relates to the technical field of photovoltaic power generation, and more specifically, relates to an IV scanning method, device and system. Background technique [0002] Photovoltaic module IV data refers to the current-voltage data of photovoltaic modules during operation. Since IV data can directly reflect the health status of photovoltaic modules, IV data is widely used in fault diagnosis and operating status monitoring of photovoltaic modules. In practical applications, the IV data of photovoltaic modules is mainly obtained through IV scanning of photovoltaic modules by photovoltaic inverters. The specific process is: the photovoltaic inverter dynamically changes the load of photovoltaic modules, and scans from the maximum voltage of photovoltaic The module voltage is close to zero voltage, and a set of two-dimensional arrays of different currents and voltages is obtained, and an IV curve is constructed based on the discrete ...

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Problems solved by technology

[0003] However, under actual working conditions, affected by the limited power of the photovoltaic inverter, that is, the theoretical output power of the photovoltaic module cannot exceed the actual maximum output power of the photovoltaic inverter, so that the photovoltaic inverter cannot scan during the IV scanning process. The theoretical output power of the photovoltaic module is greater than the actual maximum output power of the photovoltaic inverter, resulting in the incomplete IV curve obtained by scanning, and it is impossible to effectively diagnose whether the photovoltaic module is faulty according to the IV curve, which will affect the operation and maintenance management of the photovoltaic power station

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