Although asynchronous generator is of simple structure，low cost and high operation reliability，its output voltage is sensitive to load fluctuation． In order to solve this problem，the voltage unbalance caused by the output power change of asynchronous generator is analyzed，the conventional phase shift control and indirect voltage con-trol schemes are improved，and a direct voltage control scheme，which adopts a novel continuous reactive power compensator SVC-MERS to stabilize the output voltage，is proposed． Then，some simulations are performed to veri-fy the effectiveness of the proposed scheme in broadening the running range and improving the current quality． Fi-nally，a simulated SVC-MERS test platform，which supplies a reactive power up to 7． 66kvar，is constructed to test the voltage stabilization performance of the asynchronous generator set． As compared with STATCOM，the proposed device is of simpler structure and less switching loss benefited from the adoption of power frequency control．