The invention relates to a method for controlling the operation of a high-
voltage bypass in a thermal generator set, which is characterized in that operational
modes of the high-
voltage bypass are divided into the following four
modes according to the operational states of the thermal generator set: a set starting mode, a set normal operation tracking mode, a mode of shutdown without blowing-out and a blowing-out mode, wherein the set starting mode is divided into three stages according to different
operational requirements of a boiler: a first set starting mode, a second set starting mode and a third set starting mode. By using the method, the opening / closing of a high-
voltage bypass valve and the opening of a valve position can be controlled according to different operational stages of the set, so that main
recovery pressure of the boiler is ensured to ascend smoothly, operate stably and descend smoothly; and simultaneously, the boiler can also be controlled to improve the
recovery temperature quickly, so that the
recovery temperature is matched with the
metal temperature of a gas
turbine cylinder quickly and adapt to a combined mode of fixed pressure operation and sliding pressure operation of the set, so that the starting time of the set is shortened, steam exhausting towards air is reduced, the life loss of the
steam turbine is reduced, and the optimal starting of the set is realized.