This　paper　presents　a　fluctuating　voltage　generation　equipment　for　distributed　generation　grid-connected　converter　testing,　which　solves　the　challenge　of　testing　distributed　generation　grid-connected　converter　in　real　power　grid.　The　equipment　is　based　on　cascaded　H-bridge　structure,　the　voltage　level　of　which　is　expandable.　It　can　provide　precise　fluctuating　voltage　with　fluctuating　frequency　ranging　from　0.5　Hz　to　25　Hz　and　fluctuating　amplitude　ranging　from　0%　to　10%　of　the　fundamental　voltage　amplitude,　and　can　simulate　unbalance-degree-adjustable　three-phase　unbalance　power　grid,　and　the　unbalance　degree　ranges　from　0　to　10%.　The　equipment　can　fulfill　voltage　amplitude　and　frequency　deviation,　fluctuating　voltage　and　grid　unbalance　adaptability　test　of　the　grid-connected　converter.　This　paper　analyzes　the　operating　principle　of　this　testing　equipment　and　takes　the　field　experimental　result　of　the　＂35　kV-6MW　wind　turbine　converter　low-frequency　disturbance　testing　equipment＂,　which　is　based　on　the　equipment　topology　proposed,　as　an　example,　sufficiently　verifies　the　feasibility　and　effectiveness　of　utilizing　this　fluctuating　voltage　generation　equipment　for　distributed　generation　grid-connected　converter.　©,　2015,　Chinese　Machine　Press.　All　right　reserved.