Modulation　strategy　is　one　of　the　key　issues　of　three-level　neutral　point　clamped　(NPC)　converter.　In　allusion　to　the　complicated　implementation　of　space　vector　pulse　width　modulation　(SVPWM),　based　on　the　three-level　sinusoidal　pulse　width　modulation　(SPWM)　strategy　and　the　basic　principle　of　SVPWM　strategy　the　fast　equivalent　implementation　algorithm　of　two　kinds　of　three-level　SVPWM　strategies,　namely　the　modulation-wave　equivalent　algorithm　and　the　turn-on　time　equivalent　algorithm,　are　proposed.　The　modulation-wave　equivalent　algorithm　researches　the　equivalent　modulation-wave　under　three-level　SVPWM　strategy,　and　through　the　turn-on　time　of　each　switch　transistor　controlled　by　three-level　SPWM　the　turn-on　time　equivalent　algorithm　calculates　corresponding　conducting　time　of　each　switch　transistor　under　three-level　SVPWM　strategy.　Results　of　both　simulation　and　experiments　show　that　the　proposed　two　kinds　of　three-level　SVPWM　strategies　possess　the　advantages　of　simple　implementation,　short　computing　time,　and　the　obtained　results　are　more　accurate.