Design procedure for active filters for improving power quality

The principle objective of this research effort is to develop a comprehensive procedure, a supporting set of tools for Active Power Filter Design. This procedure was derived from first principles, implemented in an advanced simulation software suite, verified against published data, and applied to several power systems. The active power filter model was represented by the average model in rotating dq-coordinates and synchronized with the input voltage, suitable for any power system level.; Active power filter transfer functions were developed and accurately predicted by instantaneous active power theory, d-q transformation, and dc small signal linearization. The steady-state characteristics of the average model in addition to the dynamic response characteristics (Harmonics currents and reactive power and output voltage of the active filter), are verified against published data and accurately reflect system performance. Control strategies were developed and steady state goals were achieved in controlling power factor and fundamental current waveforms. The results show that the converter has a fast dynamic response, ease of control and good switching pattern. In order to demonstrate the effectiveness of the methodology, this robust system model is applied to a distribution power system and an electric ship power system. This design procedure of APF model can be applied to a wide variety of simulation studies. Several of which include hybrid parallel active filters and multi module parallel active filter. This is described in detail in this work.; There are several essential supporting concepts associated with this work. One is the focus on the stability of the system. As such the dissertation must build upon many of the core concepts advanced by two men: Dr. D. K. Lindner and Dr. Middlebrook. Their work on the importance of design of the electrical power distribution system and stability of the interconnected systems were critical to this dissertation. The synthesis of this concept is basic to fully understanding this dissertation.; Another essential supporting concept is the focus on the interaction between the filter design problem and the converter design problem. The optimization methodology described enables designer to obtain optimized electric power subsystem.