A dual-hysteresis space-vector discrete current control method for shunt active power filters(SAPF) was proposed.Firstly,the constraint condition and the optimal direction of the equivalent voltage error vector were both discussed in detail.Then,the proposed control method was presented,which mainly deals with the conditions when the current error vector is in the outer loop or the inner loop.As it is in the outer loop,the optimal output voltage vector was synthesized to improve the dynamic performances of ...