PROJECT TITLE :

Coordinated Day-Ahead Reactive Power Dispatch in Distribution Network Based on Real Power Forecast Errors

ABSTRACT:

Reactive power outputs of DGs are used along with capacitor banks to control distribution network voltage. But, reactive power capability of a DG is limited by the inverter ratings and real power outputs of the DG. So as to attain optimal power flow, minimize power losses, and minimize switching of capacitor banks, a day-ahead coordinated dispatch technique of reactive power is proposed. Forecast errors of DG real power in each period are used to estimate the likelihood distribution of DGs reactive power capacity. Considering totally different output characteristics and constraints of reactive power sources, a dynamic preliminary-coarse-fine adjustment method is meant to optimize DG and shunt compensator outputs, decrease the switching value, and reduce loss. The preliminary optimization obtains initial values, and multiple iterations between the coarse and fine optimizations are used to achieve a coordinated result. Simulations studies are performed to verify the proposed method.