Abstract: The concept of virtual quadrature source（VQS） was introduced and a novel voltage regulator with controllable phase and amplitude（VRCPA） was proposed.The single-phase VRCPA comprises of a Buck type AC chopper,a 3rd harmonic trap and a Boost type AC chopper.In relation to the input voltage,the phase and amplitude of the output voltage are regulated respectively.The Buck type AC chopper and the 3rd harmonic trap regulate the phase,and the Boost type AC chopper regulates the amplitude.Based on the single-phase VRCPA,the three-phase VRCPA was constructed and deduced.The 3rd harmonic trap could be canceled in the three-phase VRCPA,so it has a simple structure.The principle of VRCPA,which has potential applications to control power transmission,was analyzed in detail.Simulation and experimental results proved the feasibility of the VRCPA and the correctness of its theoretical analysis.