This　paper　proposes　a　modified　carrier-based　PWM　method　for　multilevel　converters　using　a　single-carrier.　The　existing　scalar　PWM　strategies　are　based　on　the　comparison　between　a　sinusoidal　reference　waveform　and　multiple　carriers　on　each　phase.　The　major　drawback　of　this　approach　is　an　increased　number　of　carriers　required　when　the　output　voltage　of　the　multilevel　converter　increases;　usually,　n-1　carriers　are　needed　for　n-level　converters.　Consequently,　higher　computation　effort　is　required,　which　increases　the　complexity　of　their　practical　implementation　on　low-cost　digital　control　boards.　To　reduce　the　complexity　of　the　implementation　of　the　modulation　strategy,　a　new　single-carrier　PWM　strategy　for　multi-level　converters　is　proposed　in　this　paper.　Only　one　carrier　is　required　regardless　of　the　number　of　output　voltage　levels　to　be　generated　by　the　converter.　With　simple　manipulations,　the　sinusoidal　references　are　transformed　to　fit　the　range　of　the　triangle　carrier;　this　is　valid　with　and　without　an　injected　homopolar　component.　The　simulation　results　show　that　the　new　strategy　is　theoretically　equivalent　to　a　multi-carrier　PD-PWM　method.The　effectiveness　of　the　proposed　modulation　scheme　is　applied　to　the　7-level　and　11-level　cascaded　multilevel　converters　and　successfully　simulated　at　different　operating　points.　Also,　similar　simulations　are　performed　on　a　5-level　Neutral-Point-Clamped　converter　to　demonstrate　its　wide　application　range.　©　2019　IEEE.