Active power line conditioner with fundamental negative sequence compensation

摘要

An improved active power line conditioner is disclosed. The active power line conditioner includes a series inverter coupled to an energy input source, and a parallel inverter coupled to a non-linear load. The non-linear load is powered by a three phase load current which includes fundamental components and harmonic components. An energy storage element is electrically connected between the series inverter and the parallel inverter. The series inverter is controlled by a series filter controller which performs synchronous transformations on the load current to generate a series filter feedforward signal corresponding to the fundamental components of the load current. The series filter feedforward signal is applied to the series inverter to generate sinusoidal input currents for the non-linear load. The parallel inverter is controlled by a parallel filter controller which performs synchronous transformations on the load current or series inverter input voltages to generate a parallel filter signal corresponding to the harmonic ripple components of the load current. The parallel filter signal is applied to the parallel inverter to generate sinusoidal voltages for the non-linear load.