Fault identification and isolation method for power supply system of spacecraft

Abstract

The invention discloses a fault identification and isolation method for a spacecraft power supply system, and the method comprises the steps: classifying all specific fault modes in an MPPT module into an open-circuit fault and a short-circuit fault, and carrying out the recognition and isolation of the two fault modes; wherein under the normal condition, the backup module has no input, when a fault is detected, the main MPPT module 1 or the main MPPT module 2 is cut off through the change-over switch K1 or K2, and the output of the solar cell array 1 or the solar cell array 2 is connected to the input of the backup MPPT module, so fault isolation and uninterrupted power supply of the system are realized. According to the invention, full fault identification and isolation of the MPPT type spacecraft are realized, the working continuity of the power supply system is guaranteed, the autonomy and reliability of the spacecraft power supply system are improved, and the system safety is guaranteed.

Description

technical field [0001] The invention relates to a fault identification and isolation method for a power system, in particular to a fault identification and isolation method for a spacecraft power system based on MPPT (solar battery array maximum power point tracking) technology, and belongs to the field of power systems. Background technique [0002] The spacecraft power system is the basic platform system of the spacecraft, which is directly related to the safety of the spacecraft. Therefore, the reliability and safety of the spacecraft power system is very important. Therefore, the power system often needs to adopt redundant design and fault identification and isolation Due to the limitation of long distance and measurement and control arc, real-time measurement and control is often impossible, and the ground cannot timely identify and deal with spacecraft failures. This requires the spacecraft to have a high degree of autonomy and be able to Automatically identify and iso...

AI Technical Summary

Problems solved by technology

The current spacecraft are mainly parallel shunt power supply systems, most of which are in low-Earth orbit. The proportion of the total power tends to be small, and the failure effect of a single shunt string is small

In the deep space applications represented by Mars exploration, the MPPT power system is a series power system. Since it cannot be measured and controlled in real time, the requirements for the autonomous management function of the power system are higher, and because the solar array power corresponding to each MPPT module It accounts for a large proportion of the power of the whole device, and failure has a greater impact on the system, and the interior of the MPPT module is complex, with many fault points and specific fault modes. How to independently identify and isolate faults is an important function of the MPPT spacecraft power system , is the basic requirement to ensure the safety of the whole device

[0004] In the existing publicly reported literature, there is no report on the fault identification and isolation protection of the MPPT-type spacecraft power system. The protection measures reported in other fields are only for the protection of the specific fault point itself, and the fault coverage cannot be achieved. , and the measures taken are to stop the work of the MPPT module, which cannot meet the requirements of aerospace applications

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