基于DCS改造最小验证平台的稳压器压力控制回路比对测试研究

Research on Pressurizer Pressure Control Loop Test Based on Minimum Verification Platform of DCS Transformation

大亚湾核电站核岛模拟控制系统采用美国Bailey9020模拟平台,计划在30 a大修期间进行数字化升级改造。本项目将SpeedHold-N(SH-N)系统、Bailey9020模拟平台、大亚湾核电站工艺仿真模型通过可编程控制器(PLC)接口搭建最小验证平台,选取稳压器压力控制回路为验证对象,以调试程序为参考,通过对比相同扰动在不同平台的响应差异,验证了大亚湾核电站当前控制参数在目标数字化控制系统(DCS)平台的适用性,发现了Bailey9020模拟平台比例积分(PI)控制器在手自动切换时有比例作用无法响应的固有缺陷,并分别从电路设计和操作程序两方面提出了相应优化措施,达到了模拟平台解析、DCS组态验证、定值转换验证的目的,同时为当前大亚湾核电站机组运行提出了重要反馈。

Daya Bay Nuclear Power Plant adopts U.S. Bailey9020 analog control platform and plans to carry out the digitally upgrading during 30-year overhaul. In this project, the target SH-N system, Bailey9020 platform and Daya Bay process simulation model are used to build the verification platform through the PLC interface, and the pressurizer pressure control loop is selected as the verification object. This project takes the startup test program as reference. By comparing the response differences of the same disturbance on different platforms, it verifies the applicability of the current control parameters of Daya Bay in the target DCS platform, and finds the inherent defect that the proportional function of the PI controller of bailey9020 platform cannot respond when conducting the manual/automatic switching. The corresponding optimization measures are put forward from the aspects of circuit design and operation program. This project achieves the purpose of analog board analysis, DCS configuration verification and constant value conversion, and provides important feedback for the current Daya Bay unit operation.