Research On Nonlinear Coordinated And Dissipative Control Based On The Integral Generation Unit Model

The coordinated control system of supercritical unit is a very important part in supercritical unit. At present, most of the coordinated control system is based on boiler-turbine model for supercritical unit, ignoring the dynamic characteristics of the generator, and separating the interaction between boiler-turbine and power grid. And the power grid operating conditions change at any time, but the power generation unit can only use of energy storage in accordance with the degree of pre-designed, adjust the active efforts rate of change, which makes the generation unit difficult to participate in the frequency modulation of electric power system during an emergency. To solve this issue, this paper conduct the coordinated control of dissipative based on the integral power generation unit.Dissipation theory is from the perspective of energy system stability, it provides a new way of thinking for the design of the control system. Based on the Lyapunov stability theory and input and output stability theory, it leads to dissipation stability conditions and dissipation stability theorem, by which it induces control rates for nonlinear dissipative systems. Synchronous generator excitation controller is designed according to the theory of dissipative. A third-order machine infinite mathematical model is selected, according to the design method of the SISO nonlinear systems dissipative controller, the infinite system of single dissipative controller is designed. Through simulation, synchronous generator excitation controller has good resistance.The dissipative controller for the supercritical integral generating unit is designed. Separately analyizing the principle of the boiler, heat transfer piping, steam turbine and generator excitation system mechanism,it establishs a mathematical model of the supercritical integral generating units. The stability theorem of dissipative control for MIMO nonlinear systems is proposed.Then the integral power unit model is analyzed,so that it is divided into two subsystems. It analyzes the dissipation of the two subsystems, and designes dissipative controller for integral power unit model. By variable parameters operation and robustness simulations, the dissipation coordination controller based on the integral power generating unit are better for control quality than traditional coordinated control.