| Due to the world significant electricity consumption increment,the environmental crisis,and power stability importance,the renewable energy generation and micro-grids(MG)are become highlighted solutions to meet the consumers demand,by defining as a high efficient connected or islanded power system which typically contains,loads,storage devices and generators.Micro-grids are consider as controllable systems which are capable to diversify green energy resources application.As distributed generation is a novel methodology for electrical energy generation that is one of the crucial parts of a micro-grid,so cooperative control of electricity generators has undeniable advantages on MGs which can guarantee the optimal collaboration among various parts of the system.Consensus tracking which is a cooperative strategy to obtain the agents agreement,is one of the most attractive topics in multi-agent system(MAS).This thesis proposes a novel high-gain observer(HGO)based on sliding mode controller(SMC)to estimate the states of the multi-agent syncronous generators(SGs)and also overcoming consensus tracking problem.While SGs are included in distributed generators(DGs)unites,which are considered as a challenging problem for MGs stability and reliability.The high-gain observer is implemented to estimate the nonlinear state space of SGs,hence sliding mode controller achieves finite time convergence of SGs state trajectories.Furthermore,fast errors convergence and disturbance rejection are the main features of the presented controller.On the other hand,the great ability to distinguish complexity of the multi-agent SGs nonlinearity repercussion and eliminate overshoot phenomenon by selecting a sufficient gain for the high-gain observer entails a fast and accurate state estimation for the follower agents. |
