Research on Disturbance Rejection Control Algorithm for CLLLC Resonant Converter
CLLLC resonant converters are widely used in DC microgrid system because of their high transmission efficiency and high power density.However,the sudden load changes and parameter perturbations will cause the output voltage to fluctuate,making the stable control of the output voltage a challenge.This paper obtains the reduced-order model based on the sweep method with high model accuracy and verifies the accuracy of the extended descrip-tion function method(EDF)small-signal model,which has good engineering practice significance.The improved linear extended state observer(LESO)proposed in this paper can estimate and compensate the total disturbance in-cluding load mutation and model deviation in real time,and the parameter adjustment is simple,which solves the problem that the traditional LESO needs to adjust the tracking error with high gain and the steady-state error.Com-pared with PI control and traditional linear active disturbance rejection control(LADRC),it is proved that the im-proved LESO can control the stability of output voltage more effectively.
Resonant converterExtended describing functionsLinear extended state observerDisturbance rejec-tionOutput voltage stabilization
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