A Method for Eliminating Current Fluctuation of Power Supply Device of Control Rod Drive Mechanism

Abstract

The invention discloses a method for eliminating current fluctuations in a power supply device of a control rod drive mechanism. The method includes: Step 1: Preset a set of frequency-fixed control signals and their duty ratio upper limit values, wherein the duty ratio of the control signals is The ratio setting is as follows: start from zero and increase to the upper limit setting value of the duty ratio at a certain rate of change; Step 2: After receiving the instruction of changing the current from large to small, cut off the control signal of the closed-loop adjustment of the main circuit of the CRDM power supply device; Step 3: Simultaneously control the two switches in the main circuit of the CRDM power supply device based on the control signal preset in step 1; Step 3: After the current is changed from large to small, the CRDM power supply device switches back to closed-loop control, which eliminates the drive The output current fluctuation of the plug-in effectively optimizes the output current of the CRDM power supply device, thereby improving the technical effect of the long-term operation safety and reliability of the driving mechanism.

Description

technical field [0001] The invention relates to the field of power supply for a rod power supply system of a nuclear power plant, in particular to a method for eliminating current fluctuations of a power supply device of a control rod drive mechanism. Background technique [0002] Nuclear power plants generate electricity by controlling the reactivity of the nuclear reactor, adjusting the output thermal power of the reactor, and driving the steam turbine to operate. [0003] The most direct and fastest way to control the reactivity of the reactor is to adjust the position of the reactor control rods with neutron absorption function in the core. [0004] The position of the control rod in the reactor core is adjusted by the control rod drive mechanism (CRDM). The two claws inside the CRDM alternately attract, open, and move, thereby driving the control rods hanging on the CRDM drive rod to be active in the reactor core. The zone rises, inserts and remains stationary, so that...

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for eliminating the current fluctuation of the power supply device of the control rod drive mechanism, which solves the problem that the output current of the drive plug-in main circuit in the power supply module of the existing rod power supply system changes from large to small, and the output current of the drive plug-in will fluctuate. It is very easy to cause circuit failure alarm, affect the performance of the driving mechanism, and thus affect the long-term operation of the driving mechanism. The technical effect of improving the safety and reliability of the long-term operation of the driving mechanism

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