Water level fault-tolerant control method of nuclear power unit steam generator

Abstract

The invention discloses a water level fault-tolerant control method of a nuclear power unit steam generator. The method comprises the following steps of: continuously acquiring data of a complete water level control loop, particularly a detection instrument and a regulating valve, performing online fault diagnosis according to an acquired data set, and judging the type and the degree of a fault generated by the detection instrument or the regulating valve, then performing controller fault-tolerant reconstruction decision according to the type and degree of the fault, reconstructing a controller structure and parameters to offset the fault influence, finally calculating the fault-tolerant control instruction in the presence of the fault, and reaching a digital instrument control system of anuclear power unit through a field bus. The defect that an existing digital instrument control system of the nuclear power unit cannot deal with partial failure of instruments and regulating valves is overcome, and the operation safety of the nuclear power unit is guaranteed.

Description

technical field [0001] The invention relates to the technical field of safe operation control of nuclear power plants, in particular to a method for implementing a fault-tolerant controller for water level control of a steam generator of a pressurized water reactor nuclear power unit. Background technique [0002] At present, the digital instrumentation and control system (DCS for short) is adopted in the nuclear power units in service and newly built all over the world to realize the centralized monitoring, remote operation, automatic control and protection functions of the whole process of the plant. However, the successful control of nuclear power units by DCS at present is based on the fact that the detection instruments (such as temperature detection, pressure detection, water level detection, etc.) correct operation of such prerequisites. Once these detection instruments and actuators fail, the control functions of the DCS system will partially or completely fail, cau...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a fault-tolerant controller in view of the shortcomings of the existing technology that the DCS system cannot guarantee safe operation when faults such as detection instruments and regulating valves occur in the water level control circuit of the steam generator of the nuclear power unit

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