Instantaneous Reactive Power Compensation Theory Using a Three Dimensional Cross Vector.

A three-phase, active power filter with a predictive-instantaneous-current PWM controller

“…Moreover, it is also possible to determine Gt by computation by measuring the load power; in doing so, when the compensation current is computed, the same result as Ref. 6 can also be obtained (see the appendix).…”

“…However, it has also been pointed out that the control circuit becomes complicated because of the accompanying coordinate transformation [5,6]. With respect to this, a technique paying attention to the instantaneous power of the power source [5] and a method for detecting the interfering currents using cross-vector computation but without using coordinate transformation [6] have been proposed; as a result, simplification of the converters has been realized. Since these techniques will greatly contribute to the small-size and low-cost implementation of the active power filters, the simplification techniques may also be one of the important subjects in the future.…”