Research on Control Strategy of CLLLC Resonant Converter Applied in Energy Storage System
Dynamic performance and operating efficiency are important performance indicators of CLLLC resonant con-verters.Aiming at the problem that the dynamic performance of the system further deteriorates after adding current-driv-en synchronous rectification to the traditional voltage closed-loop control,we proposed a voltage-current dual closed-loop frequency control strategy with resonant current inner loop,and gave a comprehensive control method of this dual-loop control and synchronous rectification.Firstly,according to the gain characteristics of the converter,we analyzed the effects of inductance ratio and quality factor on the gain curve and efficiency,and designed the resonance parame-ters accordingly.Secondly,we realized the synchronous rectification according to the resonance current characteristics under different resonance states.Finally,we introduced the resonant current inner-loop control,and realized the com-prehensive control of dual-loop control and synchronous rectification.The simulation results show that the proposed comprehensive control strategy can generate accurate synchronous rectification drive signals,and can significantly im-prove the dynamic performance of the converter to load disturbance and voltage disturbance compared with the tradition-al voltage closed-loop control.
CLLLC resonant converterssynchronous rectificationresonant current inner loop controldynamic per-formanceefficiency
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