Control of Power Electronic Converters
Technical Lecture Session
Control of AC-DC and DC-AC
Control, Digital Control, Non-linear Control, AC-DC, DSP, Three-Phase, Power Converter Modeling
Three-Phase Pulse Width Modulated (PWM) converters are used in a large number of application. Usually, dual-loop control structures implemented with linear compesators are employed. As a consequence, the transient response of the closed-loop system is limited by the dynamic of the linear compensators. In this paper, a novel geometric-based approach for the three-phase PWM rectifier is introduced. A geometric large-signal model that describes the average natural trajectories for the operating point is derived. Based on the trajectories, a controller that computes the path that the operating point must follow to achieve the target point is proposed. As a result, the operating point follows a well-known and determined trajectory. The characteristic features of the proposed method are fast, reliable and predictable transient responses, as well as low computational cost and low-bandwidth sensing and signal conditioning stages. Simulation and experimental results are provided to validate the theoretical analysis and implementation of the geometric-based controller.