The utility model provides a wind turbine generator system voltage source emulation subassembly, including wind energy conversion system simulator, change oar simulator, shafting transmission shaft simulator, control assembly, protected location and voltage source unit, the wind energy conversion system simulator is connected shafting transmission shaft simulator respectively and is become the oar simulator, control assembly connects change oar simulator, shafting transmission shaft simulator, protected location and voltage source unit respectively, shafting transmission shaft simulator is connected with the protected location. The utility model provides a subassembly is nimble, open, well just scalability is good for maintainability, the simulation environment demand of multicomputer quantity, complicated electric network composition on the yardstick of space -rated is applicable to time scale and goes up from millisecond level to second level emulation step -length demand of span on a large scale, and the emulation of be applicable to all mainstream wind turbine generator system types and typical control characteristic simultaneously, wading net protection characteristic realizes the demand to it is not subject to the simulation software platform, and software platform's parameter compatibility is realized striding by accurate and efficient.