The invention provides a novel megawatt wind generating set testing
system and a testing method thereof. Energy provided by a power
system provides
electric energy for a double shaft-extension dragging motor by a series of devices; then the dragging motor drives a tested set to operate by a series of devices such as a wind wheel simulator and the like; and the
electric energy generated by the tested set is returned to a
distribution transformer by a series of devices so that
energy feedback is realized. The tested set can simulate the characteristics of a wind
turbine under different wind conditions by means of the wind wheel simulator and the output characteristics of the tested set can be detected by the testing
system. Meanwhile, the
low voltage ride through (LVRT) performance of the tested set can be tested by arranging an LVRT device in the feeding link. The system has the advantages of
electric energy saving, flexible configuration and wide applicable power range, capability of testing the control performance and the output power characteristics of the tested set, capability of detecting the
low voltage ride through (LVRT) capability of the tested set by adopting the LVRT device, strong compatibility and expansibility and capability of knowing the testing conditions on site in time and meeting multidirectional testing requirements.