Synchronized Controlof Converters in Hybrid AC/DC Microgridat grid- connected mode

The hybrid microgrid is made up of both AC and DC networks coupled together through multiple bidirectional converters. AC sources and loads are linked to the ACnetwork while DC sources and loads are joined to the DC network. A hybrid AC/DC microgrid reduces several DC/AC/DC or AC/DC/ACtransformations in anexclusiveACor DC network. Energy storage systems could be linked to DC or AC buses. The presented hybrid microgrid can work in a grid-connected or autonomous mode. In this paper, synchronized control forconverters of microgrid is introduced for stable system operation under generation and load condition. Particle Swarm Optimization (PSO) algorithm is applied to find out best PI controllers’ gains in order to quickly restore and stabilize the voltage of DC bus. A small hybrid grid has been modeled and simulated using the Simulink in the MATLAB and link with PSO algorithm to find best gains. The simulation results show that the system can maintain stable operation under the proposed synchronized control schemes.

Keywords:

hybrid AC , DC microgrid , synchronized control , PI controler , particle swarm optimaization