A judging criterion of state-mutation switching cycle for sliding mode controlled non-isolated grid-connection inverter with H6-type

Abstract

To confirm state-mutation switching cycle of the sliding mode controlled non-isolated grid-connected inverter with H6-type (SMCNGI-H6) system, a novel judging criterion is proposed. With the case of folded diagram, state-mutation phenomenon is observed that the state variable changes from period-1 to period-doubling at a certain switching cycle. Then the root cause of state-mutation phenomenon is explored. Meanwhile, regarding the variation of state-mutation switching cycle with the parameters of sliding mode controller (SMC), a novel criterion is proposed to determine state-mutation switching cycle of the state variable. The numerical simulations and experimental results show that state-mutation switching cycle can be precisely determined by the judging criterion.