Fault diagnosis method of S4R serial-connection type sequence switch shunt regulator

Abstract

The invention provides a fault diagnosis method of an S4R serial-connection type sequence switch shunt regulator. The method includes following steps: analyzing the operating state of the S4R serial-connection type sequence switch shunt regulator in a no-fault condition; obtaining fault modes of a single-stage shunt regulating circuit in the fault condition of one or more switches through analysis; selecting detection points as solar cell sub-array voltages corresponding to multiple channels of shunt regulation circuits, and selecting a sampling frequency; selecting a sampling data time lengthto cover a complete switching cycle of the solar cell sub-array voltage; sampling the solar cell sub-array voltage corresponding to each stage of shunt regulation circuit, and sampling a storage battery pack voltage Vbat; searching a regulation stage; performing fault diagnosis according to the found regulation state; and continuing next round of sampling and diagnosis. By adopting the technicalscheme of the method, normal operation of the shunt regulator is not affected, the detection omission rate of faults is low, the fault detection rate is high, accurate positioning of the faults is realized, and the diagnosis speed is fast.

Description

technical field [0001] The invention relates to the field of fault diagnosis of a spacecraft power controller (PCU), in particular to a fault diagnosis method for an S4R series sequence switch shunt regulator. Background technique [0002] Shunt regulators are widely used in spacecraft power controllers to regulate the output power of solar arrays and bus voltage. From the perspective of energy transmission, the topology of the spacecraft power system can be divided into direct energy transfer (DET) and peak power tracking. Shunt regulators are typically used in figure 1 The DET topology shown. [0003] The principle block diagram of series sequence switch shunt adjustment is as follows: figure 2 shown. The shunt regulator divides the solar array into n identical sub-arrays, the positive end of each sub-array is grounded through the switch tube K1, and connected to the bus V through the diode D1 bus , connected to the battery pack V through the diode D2 and the switch ...

AI Technical Summary

Problems solved by technology

[0008] In view of the above technical problems, the present invention discloses a fault diagnosis method for a S4R series sequence switch shunt regulator, which solves the problem that the current fault diagnosis method cannot accurately detect and locate the fault of the shunt regulator, and shortens the time for fault detection and location. Improve fault detection and localization accuracy

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