Abstract: It is of significant theoretical and practical meaning to research the low voltage ride through (abbr. LVRT) characteristics of bundled transmission system composed of offshore wind power cluster and thermal power units. For this reason, in allusion to the actual planning scenario of a realistic bundled offshore wind power cluster and thermal power units, firstly, it was proposed that the non-failure wind farm in the offshore wind power cluster might deteriorate the grid environment of LVRT of faulty wind farm, therefore the wind farm cluster made a higher request for the supporting capacity of LVRT of the grid. Secondly, form the two aspects, i.e., the promotion of system short circuit ratio because of thermal power units and reactive support from thermal power units, the promotion of LVRT of offshore wind farm cluster by thermal power units was revealed. Finally, in the platform of PSCAD/EMTDC a scene of bundled power delivery composed of practically planned offshore wind power cluster and thermal power units was built, and the reasonability of abovementioned theoretical analysis was proved from the viewpoint of time-domain.