Study On The Nonlinear Adaptive Robust Control For Power System

Power systems are strongly nonlinear, multidimensional, dynamic large-scale systems. Once power systems lose stability, the transient process is very quick, improper handling may soon spread to the whole systems, often causes large-scale and longer power cuts, and then causes great damage to the national economy and serious danger to people' life. The collapse and breakdown of power systems may be caused also in the most serious cases. Under these circumstances, study and realize the appropriate stability control approaches not only can enhance the systems operation reliability but also can produce direct economic benefits because of enhancement of transmission capacity. With the development of micro-computers and modern control theory, all sorts of advanced control methods have been widely used in power systems. These improve the performance of the power system, and also provide a variety of ways to solve the power system security, stability and economic operation.In this paper, summed up the current power system stability control status, aiming at the non-linear model of the power system, using Backstepping methods, adaptive control and sliding methods, design the non-linear controller.The following are key elements:(1) Introduced the power system stability control developments, the main control methods of power system stability control and application of control theory in power system.(2) The Backstepping design methods were developed, to the parameters uncertainty and external disturb in the actual system, integrated the adaptive and sliding control theory in Backstepping design steps, designed an nonlinear systems adaptive robust controller.(3) Aiming at the differential mathematical model of single machine-infinite bus system with excitation control, under the condition of parameters uncertain and external disturbances, using Backstepping, adaptive and sliding design a non-linear adaptive robust controller, under simulation and analysis of the design results, discussed the benefits of the controller. The simulation results show that the controller can suppress rapidly and ensure the transient stabily of signle machine-infinite bus system.(4) Aiming at the differential mathematical model of single machine-infinite bus system with TCSC, under the condition of parameters uncertainty and external disturbances, using Backstepping, adaptive and sliding design a non-linear adaptive robust controller, under simulation and analysis of the design results, discussed the benefits of the controller. The simulation results show that the controller can suppress rapidly and ensure the transient stabily of signle machine-infinite bus system.(5) Aiming at the differential mathematical model of AC/DC parallel transmission system, under the condition of parameters uncertainty and external disturbances, using Backstepping, adaptive and sliding design a non-linear adaptive robust controller, under simulation and analysis of the design results, discussed the benefits of the controller. The simulation results show that the controller can suppress rapidly and ensure the transient stabily of signle machine-infinite bus system.