With　the　growing　interest　in　microgrids　to　support　renewable-energy　sources,　such　as　wind　power　and　photovoltaic　systems,　control　of　microgrid　components,　such　as　inverters,　is　of　increasing　importance.　Droop　controls　are　methods　that　without　communication　lines　can　stabilize　power　sharing　and　grid　formation　for　power　generators.　A　virtual　synchronous　generator　(VSG)　is　a　control　method　for　inverters　that　mimics　both　steady-state　droop　characteristics　and　dynamic　characteristics　of　synchronous　generators　(SGs)　to　enhance　the　inertia　of　microgrids.　In　this　paper,　some　representative　VSG　control　methods　are　presented　and　compared.　Some　characteristics　that　are　not　described　clearly　in　the　literature　are　analyzed,　such　as　the　different　forms　of　damping　effects　in　VSGs　and　the　necessity　of　an　inner　voltage　loop.　A　comparison　of　VSGs　and　droop　controls　leads　to　the　conclusion　that　a　VSG　can　be　regarded　as　a　special　type　of　droop　control　that　mimics　the　rotor　inertia　and　damping　effect　of　SGs.　This　is　done　by　changing　the　compensator　parameters　of　a　droop　control.　Furthermore,　in　the　droop　control,　if　the　compensator　is　designed　properly,　the　dynamic　performance　of　the　system　can　be　even　better　than　SGs.　Simulations　and　experimental　results　are　provided　to　support　the　conclusions.