Differences and Cause Analysis of Pressurizer Pressure Control Response
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摘要: 国内早期商运的核电机组需要进行仪控系统数字化改造。大亚湾核电站数字化改造前后事故工况下稳压器压力控制响应存在差异，通过对多个采用不同数字化仪控系统（DCS）平台核电机组的稳压器压力控制响应曲线和比例-积分-微分（PID）控制器算法进行对比分析，发现了稳压器压力控制响应差异的原因，并提出了增加PID调节范围和开闭环切换的方案，使控制系统兼具增量型和位置型PID控制器的优点，稳压器压力控制性能得到提升，并在某核电厂跳堆试验中得到了验证。本文提出的稳压器压力控制器的优化方法，对核电机组后续数字化改造具有参考价值和借鉴意义。
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关键词:
- 稳压器压力控制 /
- 不完全微分 /
- 数字化仪控系统（DCS） /
- 数字化改造
Abstract: The early commercial nuclear power plants in China requires digital transformation. Against the differences of pressurizer pressure control response under accident condition before and after the digital transformation of Daya Bay Nuclear Power Plant, by comparative analysis of pressurizer pressure control response curve and Proportion-Integral-Derivative (PID) controller algorithm in several nuclear power plants with different Digital Instrumentation and Control System (DCS) platforms, this paper finds out the cause of control discrepancy and proposes a scheme to increase the PID regulation range and add switch logic between open and closed loops, which combines the advantages of incremental and positional PID controllers in the control system. The pressurizer pressure control performance is improved, and it has been verified in reactor trip test of a nuclear power plant.The optimization method of the pressurizer pressure controller proposed in this paper has good reference value and significance for the subsequent digital transformation of nuclear power plants. -
图 1 大亚湾核电站改造前后误安注工况下稳压器压力响应和喷淋阀开度
Figure 1. Pressure Response of Pressurizer and Opening of Spray Valve under Incorrect Safety Injection Conditions before and after Transformation in Daya Bay Nuclear Power Plant
图 2 PID控制器输出与喷淋阀、比例加热器开度关系
1 bar=0.1 MPa。
Figure 2. Relationship between PID Controller Output and Opening of Spray Valve and Proportional Heater
图 3 大亚湾核电站数字化改造前后稳压器压力补偿差压变化曲线
Figure 3. Compensation Differential Pressure Variation Curve of Pressurizer before and after Transformation in Daya Bay Nuclear Power Plant
图 4 改造后的补偿差压和压力偏差曲线
Figure 4. Curve of Compensation Differential Pressure and Pressure Deviation after Transformation
图 5 L核电厂补偿差压和压力偏差的变化曲线
Figure 5. Curve of Compensation Differential Pressure and Pressure Deviation of L Nuclear Plant
图 6 L核电厂和F核电厂跳堆试验稳压器压力和补偿差压曲线
Figure 6. Curve of Pressurizer Pressure and Compensation Differential Pressure during Reactor Trip Test of L Nuclear Plant and F Nuclear Plant
图 7 H核电厂改进后稳压器压力PID输出与喷淋阀、比例式加热器开度关系
Figure 7. Relationship between Pressurizer Pressure PID Output and Opening of Spray Valve and Proportional Heater after Improvement in H Nuclear Plant
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