ADAPTIVE CONTROLLER FOR D-STATCOM IN THE STATIONARY REFERENCE FRAME TO COMPENSATE FOR REACTIVE AND HARMONIC DISTORTION UNDER UNBALANCED CONDITIONS

摘要

A controller (130) for compensating reactive power and selected current load harmonics an unbalanced multi-phase power a multi-phase voltage source inverter (118) into the multi-phase power distribution system. The injected current is determined such that the injected current is operative to balance the load seen by the power distribution system. In particular, the controller determines the injected current to compensate for the harmonic distortion in the source current, provided by the multi-phase power distribution system, caused by non-linear/distorted and unbalanced loads in each phase. The controller receives as inputs measurements of the source voltage and current, the output voltage access an output capacitor on the VSI, and a reference voltage. The controller includes an inner loop control processor (216), an outer loop control processor, and an adaptation processor. The adaptation processor (238) is operative to estimate a selected set of predetermined harmonic components in the periodic disturbance which is a function of the unknown system parameters, the source current, the source voltage, and their time derivatives in stationary coordinates.