Solar photovoltaic system and fault detection method thereof

Abstract

The invention provides a solar photovoltaic system, which comprises a plurality of alternating current photovoltaic components, a data processing module and a system analysis module, wherein the plurality of alternating current photovoltaic components are mutually connected in series for constituting an alternating current photovoltaic component string to generate alternating current according tosolar energy; the data processing module is connected with the alternating current photovoltaic component string and used for acquiring power parameters of all the alternating current photovoltaic components through power line communication technology and detecting and identifying abnormality or a fault in the solar photovoltaic system; and the system analysis module is connected with the data processing module and used for collecting system data from the data processing module and storing, analizing, drawing or displaying the system data. The invention further provides a fault detection method of the solar photovoltaic system. Through the way of monitoring real-time data transmission between all the alternating current photovoltaic components and the data processing module, when the fault occurs in the photovoltaic system, the generation of the fault can be timely detected, and the position and the type of the fault can be further identified, thereby enabling maintenance staff to repair the fault as soon as possible and reducing the impacts on normal power generation.

Description

technical field [0001] The invention relates to the field of solar photovoltaic technology, in particular, the invention relates to a solar photovoltaic system and a fault detection method thereof. Background technique [0002] Existing solar photovoltaic systems generally include at least: DC photovoltaic modules, used to generate DC power; module inverters, used to convert DC power into AC power; module interfaces, used to receive DC power from DC photovoltaic modules; wires; Used to receive AC power from other modules or connect to the AC power grid; communication lines are used to transmit data and control signals, etc. [0003] In the current solar photovoltaic system, when it is necessary to maintain or approach the system (such as routine maintenance, fire fighting), even if the grid-connected switch is disconnected, if the photovoltaic module is still working, it will generate high voltage, which will pose a threat to personal safety. threaten. [0004] When someon...

AI Technical Summary

Problems solved by technology

[0003] In the current solar photovoltaic system, when it is necessary to maintain or approach the system (such as routine maintenance, fire fighting), even if the grid-connected switch is disconnected, if the photovoltaic module is still working, it will generate high voltage, which will pose a threat to personal safety. threaten

[0004] When someone steals the components of the solar photovoltaic system at night, since the photovoltaic modules do not generate current or voltage, the usual methods of detecting current and voltage cannot detect system failures in time, and then take protective measures

Similarly, if a system failure occurs at night, such as a disconnection of a cable connection, it cannot be detected in time

Images