Two-stage Optimal Dispatching of AC/DC Hybrid Active Distribution Systems Considering Network Flexibility

The increasing flexibility of active distribution systems (ADSs) coupled with the high penetration renewable distributed generators (RDGs) leads to increase complexity. It is practical significance achieve largest amount RDG in ADSs and maintain optimal operation. This study establishes an alternating current (AC)/direct (DC) hybrid ADS model that considers dynamic thermal rating, soft open point, network reconfiguration (DNR). Moreover, it transforms dispatching into a second-order cone programming problem. Considering different control time scales dispatchable resources, following two-stage framework proposed. ① day-ahead dispatch uses hourly input data goal minimizing grid loss dropout. obtains 24-hour schedule determine plans for DNR energy storage system. ② intraday 15 min 1-hour rolling-plan but only executes first dispatching. To eliminate error between actual operation plan, divided three 5-min step-by-step executions. each step trace tie-line power greatest extent at minimum cost. measured are used as feedback after executed. A case shows comprehensive cooperative can release line capacity, reduce losses, improve rate RDGs. Further, frame-work handle source-load fluctuations enhance system stability.