Nonlinear Control Approaches of Several Power Converters

The exploitation and utilization of renewable energy have become the important measures taken by countries all over the world to solve the contradiction among energy shortage, economic development and ecological environment. As an important bridge and energy conversion channel between renewable energy and electric energy, power converter is a basic form of transformation and control of electric energy, which plays a vital role in the exploitation and utilization of renewable energy. In the past few decades, due to the significance of both theory and practical applications, the study of power converter has become one of the hotspots of research in the field of power electronics and automation. The study of power converter control strategies is an important study research of power converter. The control strategy as the core of the control system directly determines the dynamic and static performance of the power converter. The power converter system is a typical nonlinear system. However, most of power converter control strategies are designed based on linearization control methods, which makes the control system sensitive to system parameter variations, slow dynamic response speed and poor steady-state performance, etc. Thus, in order to further improve the dynamic and static performances of power converters, the investigation of using nonlinear control methods for power converters is a challenging and meaningful work. Based on modern control theory utilizing nonlinear control approaches, this dissertation investigates the nonlinear control strategies design for several typical power converters, and the main contributions are as follows: (1) The important role of power converters in renewable energy power generation systems is introduced. Then the internal and overseas research situations of the control strategies design for the several typical power converters are classified and summarized, where the theoretical significance and the practical application backgrounds