An Efficient Approach to Optimal Control of Power Electronic Converters

Designing controllers for power electronic converters can become an intricate problem due to system limitations (such as switching frequency and component sizes) and the diversity of control objectives (such as active damping and current limiting). Classic control system approaches often lack either a transparent and convenient process or a systematic one. The designer needs to simultaneously observe multiple criteria, including stability, stability margins, transient response indices, and steady-state errors. The approaches based on state-space models, on the other hand, suffer from a lack of a systematic procedure for choosing closed-loop poles or optimal control weight matrices. This paper presents a control structure and a design procedure to address these issues. The proposed approach is applicable to both single-input single-output and multi-input multi-output control systems. It enjoys systematic design and robust performance with controlled transient responses. The proposed method is applied to several examples of power converters.