Active power decoupling control algorithm for second-order ripple suppression of single-phase rectifier
Aiming at the poor frequency adaptability of LC resonant circuits in single-phase rectifier,an active power decoupling circuit was introduced to suppress DC-bus second-order ripple voltage.The DC-split capacitor power decoupling ( DCPD) topology is capable to reduce the DC-bus capacitance.Firstly,the operation modes of DCPD were analyzed,and the mathematical model of single-phase rectifier and DCPD were established.Next,the traditional decoupling control algorithms indirectly calculate the de-coupling reference voltage.To improve the performance of power decoupling,a second order generalized integrator ( SOGI) was used to directly extract voltage ripple as the voltage reference,and a current-sen-sorless control strategy based on sliding mode observer ( SMO) was proposed.This observer reduces the cost and improves anti-interference ability of DCPD.Then,based on the performance indicators of the rectifier and power decoupling requirements,the design basis for the inductance and capacitance of DCPD was provided.Finally,steady-state and dynamic experiments were compared on single-phase recti-fiers with different topology,and the experimental results proved effectiveness of the control algorithm.
second-order ripple voltageactive power decouplingsecond order generalized integratorsliding mode observerdecoupling parameter design
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