Integral Strategies of Active Filtration in the Reference Frame of the Two-Wattmeters Method

In the paper, two integral strategies of active filtration in the reference frame of the two-wattmeters method are proposed, which are different from known ones by the simplicity of implementation, increased accuracy, and speed. The formula for calculating the energy-saving effect from active filtration in a three-phase three-wire power system in the conditions of unbalanced load and line voltages is derived. Experimental studies show that the proposed integral control strategy of active filtration with a reference vector of line asymmetric voltages provides the best energy-saving effect but generates asymmetric mains currents. The most promising is the proposed integral control strategy of active filtering with a reference vector of direct sequence line voltages, which provides almost the same energy-saving effect, symmetric sinusoidal currents of the network, and minimal ripple of power consumption.