Static　var　generator　(SVG)　of　delta　cascaded　H-bridge　structure　can　dynamically　track　the　change　of　reactive　load,improve　power　factor,restrain　the　voltage　sag　and　fluctuation,and　improve　power　quality　of　the　grid,so　it　is　widely　researched　in　recent　year.The　DC　link　voltage　control　is　a　hot　issue　to　cascaded　H-bridge　SVG　of　delta　connection　structure.Compared　with　the　carrier　modulation　method,Space　vector　modulation　method　is　suitable　for　a　real-time　implementation　in　digital　signal　processors　with　wide　linear　modulation　range　and　lower　switching　loss.But　the　DC　voltage　control　method　based　on　space　vector　modulation　in　delta　connection　cascaded　SVG　has　not　yet　been　applied　for　DC-side　voltage　control.Therefore,this　paper　proposes　three　layers　control　system,the　first　layer　is　total　DC-side　voltage　active　power　control;　the　second　layer　is　interlayer　voltage　balance　control　and　each　phase　treats　as　a　H-bridge　and　use　3D　SVPWM　method　between　each　phrase;　the　third　layer　applies　voltage　balance　control　among　each　module　in　each　phase　to　achieve　equivalent　result　between　the　given　value　and　the　DC-side　voltage　of　each　H-bridge.The　zero-sequence　current　based　on　3D-space　vector　modulation　can　generate　in　each　unit　switching　cycle,so　it　can　produce　arbitrary　order　zero　sequence　current　to　achieve　the　DC　voltage　control　with　high　speed　of　dynamic　corresponding.Lastly,the　simulation　and　experiments　results　verify　the　correctness　and　validity　of　the　method.　©　2016,　The　editorial　office　of　Transaction　of　China　Electrotechnical　Society.　All　right　reserved.