The refrigerator is an important equipment for the supply of cold sources in nuclear power plants,and in order to study and improve the control strategy of the freezer guide vane,the control procedure of the freezer and the actual situation of the freezer have been studied in depth.Simulink simulation tools were used to analyze the full travel time of the guide vane,the dead zone of the guide vane opening control,the control characteristics of the mechanical properties of the guide vane and the influence on the system.After analysis,it is found that the increase of the motion time of the guide vane is not conducive to the stability of the system,so under the working conditions of large changes in the opening of the guide vane,such as cold machine start-up and severe load change,the system instability is prone to occur,and the operation mode and the full stroke time can be optimized to avoid the freezer jumping;reasonable setting of the guide vane opening control dead zone is conducive to reducing the system overshoot,thereby reducing the probability of excessive current in the start-up stage,but it is necessary to pay attention to the change of the steady-state fluctuation amplitude of the system.The detection of the guide vane is not fully closed and the guide vane stroke is an important guarantee for the rapid and stable adjustment of the system,if the temperature fluctuation of the freezer outlet is large,it may be related to factors such as limited compressor output and reduced guide vane stroke.
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