Optimal Placement for Hybrid Energy in Micro-grid

Reasonable control of multiple energy forms for load power supply can effectively improve economy and reliability of micro-grid(MG) operation, however, up till now, these two problems of siting hybrid energy systems( HEMS) and scheduling them have been separately solved. In order to bring its flexible power supply capacity into fully play, this paper put forward an algorithm to optimally solve the problem of allocation and schedule of multiple hybrid photovoltaic (PV)-diesel distributed generation (DG) in distribution systems. Firstly, an energy control method of HEMS was present to improve efficiency and flexibility of MG operation; Secondly, an optimization problem was formulated considering not only to reduce the total investment, operation maintenance cost, network loss caused by imported power from the transmission grid, and un-served load in case of emergency, but also to maximize the excess generated power by the HEMS that may be injected into the distribution network.; Finally, an improved artificial bee colony (ABC) based on particle swarm optimization(PSO) was put forward to increase convergence speed. Simulation results based on IEEE - 33 and PG&E - 69 systems show that the presented control method can improve the economy of MG operation and reliability significantly.