Photovoltaic system of non-communication power optimizer and open circuit fault diagnosis method thereof

Abstract

The invention relates to the solar energy application technology field and provides a photovoltaic system of a non-communication power optimizer and an open circuit fault diagnosis method thereof. The system comprises a pre-stage non-communication series connection type power optimizer and a backward-stage inverter, wherein the pre-stage non-communication series connection type power optimizer is used for tracking a maximum power point of a photovoltaic component, transmitting electric energy output by the photovoltaic component and determining and acquiring an inverter fault state according to an inverter open circuit fault diagnosis model; and the backward-stage inverter is used for inverting a direct current output by the power optimizer into an alternating current and then merging into a power grid. The open circuit fault diagnosis method comprises the following steps that based on the above system, the power optimizer collects a self-inductance current and an output voltage in real time and carries out AD conversion on the current and the voltage; and if the power optimizer determines and acquires that an inverter generates an open circuit fault according to the inverter open circuit fault diagnosis model, electric energy output is stopped. By using the photovoltaic system and the open circuit fault diagnosis method, instability of communication between the power optimizer and the inverter is avoided and system reliability is increased to a certain extent.

Description

technical field [0001] The invention relates to the technical field of solar energy applications, and more specifically, to a photovoltaic system without a communication power optimizer and an open circuit fault diagnosis method thereof. Background technique [0002] Solar energy is the cleanest and most promising renewable energy in the world. In the current environment of excessive consumption of primary energy and serious pollution, the utilization of solar energy has attracted more and more attention. Among them, photovoltaic grid-connected power generation is the main development direction of solar energy utilization, and distributed photovoltaic power generation has been valued by countries all over the world because of its advantages of decentralized power generation, local use, avoidance of transmission and distribution losses and reduction of transmission and distribution investment. [0003] The power optimizer is an independent direct-to-direct (Direct Current to...

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Problems solved by technology

[0007] The present invention provides a photovoltaic system without a communication power optimizer and its open-circuit fault diagnosis method to solve the problems caused by communication-based faults in the prior art due to uncertain factors such as faults, slow speed, and bit errors that usually exist in the communication process. The problem of poor reliability of diagnostic methods

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