Wide-area time-delay damping control of generalized hamilton multi-machine power system

Abstract

Large amount of power is required for long-distance transmission with the increase of cross -transmission of electricity demand, thus it is difficult to inhibit the power oscillation between the regions to guarantee the stable operation of the whole power system which only relies on local feedback signal designed controller. Therefore, it is one of the hot spots for the analysis and design with time delay influence of wide-area controller in recent study of interconnected grid. Based on Hamilton system theory, a nonlinear time-delay generalized Hamiltonian model of corresponding wide area measurement power system model was constructed. Based on the proposed model, the corresponding Lyapunov-Krasovskii functional was given to derive a delay-dependent steady stability criterion in term of matrix inequalities. It was noticed that control input contains the influence of time-delay signal; the corresponding wide-area damping controller (WADC) was designed. The WAN feedback control with time-delay was realized; Time delay margin delay can be calculated which makes closed loop power system is stable. The relationship between the damping performance of WADC and the time delay margin was investigated. Thus corresponding control parameters of WADC were given. Finally, taking a 16-machine 68-bus power system as an example, the results of simulation in time-domain show that performance of the proposed controller is effective.