Cascaded　H-bridge　(CHB)　multilevel　inverter　has　gained　more　and　more　focus　due　to　its　adaptability　to　high-power,　high-voltage　applications　and　capability　of　fault　tolerant.　Under　the　circumstance　of　instantaneous　value　feedback　control,　the　magnetic　biasing　of　the　transformer　is　a　problem　of　great　significance.　This　paper　shows　the　circumstances　under　which　a　transformer　has　to　be　used　for　the　CHB　multilevel　inverter,　and　the　adverse　impact　of　the　magnetic　biasing　of　the　transformer.　Also,　it　analyses　the　mechanism　of　the　occurrence　of　the　DC　component　in　output　voltage　which　causes　the　magnetic　biasing,　then　the　carrier　phase　shifted　modulation　strategy　of　the　CHB　multilevel　inverter　is　discussed.　Finally,　this　paper　proposes　a　novel　control　scheme　with　several　advantages　compared　with　other　control　schemes　which　can　eliminate　the　magnetic　biasing　of　the　transformer.　The　experiment　results　are　carried　out　which　verifies　the　advantages　and　feasibility　of　the　proposed　control　scheme.　©　2012　IEEE.