DC-DC Converter Fault Detection And Realization Based On Switching System Modeling

The DC-DC converter is an important part of the power electronic system,involving all aspects of social life.The DC-DC converter is usually used as a power supply or driver in an engineering system to provide power to the entire system and is a key component of the power system.The stable operation of the DC-DC converter plays an important role in the system,especially for areas with high stability and safety requirements such as aerospace and marine systems.Therefore,the research on the closed-loop control and fault detection of DC-DC converters has important research significance and engineering application value.This dissertation takes the DC-DC converter as the research object and studies the closed-loop stability control and fault detection of the DC-DC converter.Through digital offline simulation,hardware-in-the-loop simulation(HIL)and hardware circuit,the method was verified.The effectiveness and engineering application value are studied,and the problem of DC-DC converter sensor fault detection and reconstruction is studied.Its main structure is as follows:First of all,this article takes the DC-DC converter as the research object,explores the closed-loop control and fault detection of a type of Boost converter,builds a hardware-in-the-loop simulation platform and hardware-in-kind circuit,and uses the hardware-in-the-loop simulator Typhoon-HIL402 to interact with the closed-loop connection of the digital controller DSP28335 realizes the construction of a semi-physical simulation platform.According to the specific Boost target of the circuit,select the appropriate device parameter values for the hardware physical circuit,and design the feedback signal sampling circuit,the controller circuit and the PWM signal driving circuit.Through the closed-loop connection of the hardware circuit and the digital controller DSP28335,the control strategy is verified.Engineering application value.Then,under the stable control of the control strategy,the problem of component fault detection for the Boost converter is studied,and a Luenberger observer that satisfies the H∞robust performance is designed.According to the residual signal and threshold of the observer To determine whether the circuit is faulty,the three types of faults: inductance,capacitance,and inductance and capacitance in the circuit are simulated,and the hardware-in-the-loop(HIL)simulation of the hardware-in-the-loop simulator Typhoon-HIL402 and the digital controller DSP28335 has been verified.Effectiveness of fault detection methods.Finally,the problem of sensor fault diagnosis of DC-DC converters is studied,and a sliding mode observer meeting H∞ robust performance is designed to detect sensor faults.The residual signal of the observer and the set threshold are used to judge whether the circuit is faulty.When the fault is detected,through the designed adaptive sliding mode observer,the fault reconstruction of the sensor fault is realized,and the three fault types of the sensor open circuit fault,the external noise fault and the 1.1 times gain fault are simulated respectively by the simulation circuit.The effectiveness of this method is verified.