Principal current controller of rod position measuring system in nuclear power station in the manner of pulse-width modulation closed loop feedback regulation

Abstract

The invention belongs to the field of pressurized water reactor nuclear power stations, in particular to a principal current controller of a rod position measuring system in a nuclear power station in the manner of pulse-width modulation closed loop feedback regulation, aiming at realizing stable output, reducing heat generation and simplifying rod dropping measuring processes. In the invention, a principal current controller adopts a pulse-width modulation closed loop feedback regulation control mode, a primary winding current amplitude value is adjusted and controlled through a digital potentiometer by taking a signal generated by a sine wave generator as an original signal and a detector auxiliary coil induced voltage as a main regulating variable. A control scheme of direct current pulse-width modulation is utilized for a drive circuit, a pulse width modulation amplifier is used as a power amplifying element, thereby the heat productivity of a rod position measurement device is reduced. A novel and convenient test mode of rod dropping time is adopted, rod dropping time holes and key selector switches of the rod dropping time test state / normal operating state are arranged on a panel of the principal current controller, the operation is very simple, rod dropping signal waveforms are directly obtained, and the processing is very convenient.

Description

technical field [0001] The invention relates to the field of pressurized water reactor nuclear power plants, in particular to a pulse width modulation type closed-loop feedback regulating main current controller in a control rod position measurement system of a pressurized water reactor nuclear power plant. Background technique [0002] The rod position measurement system is one of the important systems of reactor control, which is used to monitor the actual position of the control rods in the core, and provide the operator with the measured rod position information of each bundle of rods and related alarm and indication information. [0003] At present, in domestic pressurized water reactor nuclear power plants, the rod position measurement system is mainly composed of a rod position detector, a rod position measuring device and a rod position processing device. [0004] The rod position detector is installed outside the stroke sleeve assembly of the driving rod on the top ...

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Problems solved by technology

[0021] The purpose of the present invention is to provide a new type of pulse width modulation type closed-loop feedback adjustment main current controller, realize the output of stable AC current signal, and solve the problem of large heat generation of the main current controller, and simplify the measurement process of the drop time

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