An example for dynamic compensation of non-active power in the case of non-linear active loads

A lot of different definitions for active and non-active quantities and their compensation are known in case of single- or polyphase systems under steady-state conditions. In practice the load as well as the source of such a system is varying with time. This requires compensation methods which are ready to deal with dynamic conditions. In the most general case the load may be non-linear and even change from passive to active and vice versa; This paper presents a control scheme for a series compensator (series active filter) in a single-phase circuit which can handle a wide range of passive and active non-linear loads under dynamic conditions. No information about the character of the source and the load is required as long as load and source current can be controlled by appropriate voltages.