The invention discloses a thermal power
generating unit low-load coordination control method and
system, and the method comprises the steps: collecting the data of a thermal power
generating unit, building an auxiliary
machine trip prediction model, and predicting the fault of an auxiliary
machine; the D-S evidence theory is used for judging the
tripping risk of the auxiliary
machine, and if the fault does not trigger the fault load reduction RB function of the auxiliary machine, fault classification is carried out; and automatically controlling the fault auxiliary machine according to the fault
classification result, and entering low-load stable transition after the
automatic control is completed. According to the method, the structure is simple, design is reasonable, the
fan blade opening degree and the speed of the primary air fan with the
tripping risk are attenuated to 0 according to a decline function, the
fan blade opening degree and the speed of the primary air fan without the
tripping risk are increased to target values according to an incremental function, the decline function and the total incremental function are symmetrical,
complementation is achieved, and the tripping risk is reduced. An auxiliary machine tripping prediction model is constructed, door filter optimization is adopted for predicting the auxiliary machine
fault probability, and evidence combination rules are adopted for carrying out evidence fusion on fault evidences of different auxiliary machines.