Distributed control system of nuclear power plant unit and clock synchronization method thereof

Abstract

The invention discloses a distributed control system of a nuclear power plant unit and a clock synchronization method of the distributed control system. The distributed control system of the nuclear power plant unit comprises a first unit subnet, a second unit subnet and a public feeding subnet, and a first network switching module comprises a first isolation module and is used for allowing a clock signal to be transmitted between the first unit subnet and the public feeding subnet; a second network switching module comprises a second isolation module and is used for shielding transmission of a clock signal between the second unit subnet and the public feeding subnet; the clock signal transmitted between the first unit subnet and the public feeding subnet is provided by a first main clock server at normal work; the clock signal of the second unit subnet is provided by a second main clock server at normal work. According to the technical scheme, a clock broadcast message of the first main clock server and a clock broadcast message of the second main clock server can be prevented from being transmitted without limitation, and the clock messages can be transmitted directionally.

Description

technical field [0001] The invention relates to the field of nuclear power, in particular to a distributed control system of a nuclear power plant unit and a clock synchronization method thereof. Background technique [0002] Due to the particularity of nuclear power for safety, the application of new technologies in nuclear power has been relatively conservative. As a result, DCS (Digital Control System) based on computer technology, communication technology and modern control theory has only been fully applied to nuclear power units in recent years. . For the first time, Ling Ao Phase II adopts a fully digital DCS (Distributed Control System, Distributed Control System) system. [0003] However, after the commercial operation of the unit, the DCS system still has some important defects, such as the clock signal of the DCS is not synchronized with the GPS clock signal from the GPS equipment of the power plant. Due to the complex relationship between many systems in nuclea...

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Problems solved by technology

Similarly, there are more than one clock signal for the subnet of unit 4 and subnet of unit 8, which means that the control timing of the subnet of unit 3, subnet of unit 4 and subnet of unit 8 will be subversive. The behavior and state are disordered, and there are unpredictable risks such as abnormal failure of the monitoring system, delay of control commands, and unstable processing of input and output signals.

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