Study On Designing Observer For DC/DC Converter

When the system states can not be measured directly, to solve this problem, the best way is to construct state or state function through the observer, and then use these estimates value to achieve state control law. In this thesis, the observer theory will be applied to the DC / DC switching converter modeling and control, solving the contradictions of state feedback on the performance of the irreplaceability and can not be achieved in the physical.Delta operator theory will be applied to the DC / DC converter observer design. The described system using Delta operator methods avoid the numerical instability problems arising from shift operator when the high-speed sampling methods and resolve problem of the components' parameter uncertainty of the DC-DC converter's model, the observed pole position have a certain freedom, so that the DC-DC state observer is robust.Observing the system state variables using the observer, it can not avoid introducing noise, that is all state observer must face one of the problems. Kalman filter can use the dynamic information of objectives to try to remove the impact of noise, get a good position on the estimated target. This estimated value may be the estimate of the target of the current location (filtering), and can also be estimated for the future location (forecast), and can also be estimates of location e in the past (or smooth interpolation). Finally, the state observer will be construct with Kalman filtering principle.It is one of the major difficulties to overcome that the model is inaccurate observation. The average model is a simplified nonlinear systems, and switching linear system model is the DC / DC converter accurate description. Using energy features of Hamiltonian system in chapter V, combined with DC/DC converter switching linear system model, it will design the Hamiltonian observer based on the switching linear system model of the DC / DC converter.