OVERVIEW OF THE WATER LEVEL CONTROL SYSTEM OF THE VVER-1000 UNIT STEAM GENERATOR

Abstract

The properties of the steam generator of the WWER-1000 unit are studied, the main characteristics of the object are deduced and the basic principles which will help to warn against mistakes in studying of this question are specified. The types of automatic control systems are presented and the main disadvantages of each of the control systems are studied. Based on the analysis, it was determined which automatic control system is the best for the steam generator. The process of finding the parameters of the regulator and the coefficients of communication devices for the steam flow channel, feed water flow and water level in the steam generator is explained. Most publications do not explain why the 3-pulse automatic control system is used, do not compare with other control systems, and simply cite the fact that the 3-pulse control system is used without explanations and subtleties of setting up the control system itself. No explanation is given regarding the setting of the controller for the 3-pulse automatic control system and why the coefficients of the communication devices are required. Therefore, the article explains why a 3-pulse automatic control system is used instead of a 2-pulse one, how to properly adjust the water level regulator and how to configure communication devices and why they are needed. The model of the steam generator in the Simulink environment is resulted and it is shown how adjustment of at first communication devices and then finding of parameters for PI-regulator passes. Conclusions are made regarding the application of the 3-pulse control system, what modernization it received in production and the expediency of its use.