Online Distributed Security Constrained Economic Dispatch for Active Distribution Networks Based on Feedback Strategy

Abstract

This paper investigates the distributed security constrained economic dispatch (SCED) problem in an active distribution network, pursuing the minimization of generation cost of the entire system considering network security and generation limit constraints. A feedback strategy derived from the duality-based method is proposed to achieve the distributed solution of SCED. In the proposed strategy, the distribution management system (DMS) and microgenerators (MGs) are regarded as intelligent agents in charge of fast calculation and measurement. The variation of system demand results in fluctuations on branch flows, which can be measured by DMS and then transmitted to MGs. Each MG can adjust itself active power output independently so as to respond to system demand variation, and meanwhile ensure network security. The proposed method only requires partial dual variable information transfer from the DMS agent to MG agents, and has plug-and-play features. Simulations of the IEEE 33-bus system are provided to illustrate the performance and robustness of the proposed algorithm.