The　modern　industrial　park　has　the　characteristics　of　large　power　consumption,　considerable　number　of　sensitive　equipment　and　high　voltage　level.　In　order　to　mitigate　the　huge　financial　losses　due　to　voltage　sags,　and　overcome　the　shortcomings　of　single　measures,　high　cost　and　poor　feasibility　of　existing　control　schemes,　a　comprehensive　prevention　and　control　scheme　for　voltage　sag　is　proposed　to　coordinate　control　measures　on　the　grid　and　user　sides,　and　optimize　the　configuration　of　switching-type　and　compensation-type　control　equipment.　Firstly,　the　performance　and　cost　of　the　same　and　different　types　of　control　equipment　on　the　user　side　are　analyzed,　and　the　cost　model　of　each　control　equipment　is　established.　Secondly,　the　reconstruction　cost　of　transmission　and　distribution　lines　are　modeled　separately,　and　then　the　annual　voltage　sag　times　of　the　park　after　reconstruction　is　modeled.　Finally,　the　objective　function　of　the　maximum　net　present　value　of　comprehensive　prevention　and　control　scheme　is　established,　and　the　particle　swarm　optimization　algorithm　is　used　to　solve　the　optimal　configuration　scheme　of　control　equipment　in　the　park.　Through　an　example　analysis　of　a　modern　industrial　park,　it　is　proved　that　the　scheme　can　apply　various　control　means　comprehensively　to　improve　the　net　present　value　of　voltage　sag　control　in　the　park,　and　has　a　good　feasibility.　©　2020　Automation　of　Electric　Power　Systems　Press.