The static var compensator (SVC) coupling hybrid active power filters (SVC-HAPFs) which consist of a SVC part and an active inverter part have been proposed for power quality compensation recently. The cost of SVC part is much lower than that of active inverter part, thus the reduction of power rating ratio between the active inverter part and SVC part can lead to a decrease in the total cost of SVC-HAPF. However, the SVC-HAPF with too low inverter capacity may fail to perform satisfactory compensation. In this chapter, minimizing inverter capacity design and comparative performance evaluation study of different SVC-HAPFs are proposed. At first, the power rating ratio analysis between the active inverter part and SVC part is proposed. With different SVC parts consideration, the required active inverter capacity of SVC-HAPFs is deduced and analyzed. Finally, simulation and laboratory-scaled experimental results are presented to show and verify the performance and the deduced required active inverter capacity of different SVC-HAPFs. Through minimizing inverter capacity design, simulation and experimental result evaluations, a SVC-HAPF structure is recommended for better compensation performance with low inverter capacity.