Fault diagnosis method for output current of on-orbit satellite solar cell array

Abstract

The invention discloses a fault diagnosis method for output current of on-orbit satellite solar cell array. A simplified semi-physical model of the output current of the solar cell array is provided by being combined with actual on-orbit satellite telemetering historical data, on-orbit attenuation conditions of the on-orbit satellite solar cell array, the solar incident light intensity, an included angle between a sunlight vector and an orbit plane and the like, the physical model of the output current of the solar cell array is optimized by using epsilon.(cosbeta)<n>, and a dynamic alarm threshold of the output current of the solar cell array is acquired on the basis, thereby carrying out fault diagnosis on the solar cell array more accurately and more reasonably, and greatly reducing the risk of missing alarm while improving the fault diagnosis accuracy. In addition, the fault diagnosis method is moderate in calculation amount of the model, thereby being convenient for project implementation.

Description

technical field [0001] The invention relates to the field of power supply systems of on-orbit spacecraft, in particular to a fault diagnosis method for the output current of an on-orbit satellite solar battery array. Background technique [0002] The power system is a service system that provides energy for on-orbit spacecraft. The solar array is a power generation system composed of photoelectric conversion devices, and is currently the preferred power generation device for long-life spacecraft. The main purpose of its electrical performance design is to meet the power requirements of the spacecraft. [0003] Compared with other forms of energy, the solar cell array has the advantages of high power, long life, small weight, simple structure and high reliability, making it widely used and developed both on the ground and in space. However, the solar cell array is one of the few exposed devices, facing the harsh outer space environment, such as solar storms, sunspots, geomag...

AI Technical Summary

Problems solved by technology

However, in the existing technical means, the on-orbit fault diagnosis of the output current of the solar cell array is only performed by means of fixed threshold monitoring, which is prone to false positives.

For example, in 2011, a satellite solar cell array was affected by external forces in space, which caused two solar cell circuits to be damaged, and the output current of the solar cell array decreased by 3A, but the fault could not be detected by the diagnostic method based on the fixed threshold.

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