Abstract
An improved voltage balancing control (VBC) method is proposed in this paper to optimize control performance of single-phase cascaded H-bridge rectifier (CHBR). Firstly, the steady-state error of the VBC method based on capacitor energy estimation is analyzed. An error compensation method is therefore presented to eliminate the steady-state error. The proposed method delivers fast dynamic performance without steady-state error. In addition, it requires less parameter tuning than traditional proportional-integral-based (PI-based) VBC methods, and coupling effect between the upper- and the lower layer control system is also eliminated in both dynamic and steady state. Moreover, a mixed second- and third-order generalized integrator (MSTOGI) method is applied to suppress the dc offset of grid voltage, which may occur in the process of sampling or conversion. Finally, a physical experiment platform is developed and a series of comparisons are given to verify the feasibility of the proposed method.
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