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在CPR1000核电厂的工艺控制中,要求机组负荷变化率超过200 MW/min时,疏水阀打开的响应时间应在2~10 s以内,且需要抵抗1~2 s的扰动。在数字化仪控系统(DCS)中通常使用微分算法或周期迭代法根据实时及历史负荷值计算机组负荷变化率,但无法实现以上工艺要求。对这2种常用算法进行了仿真和分析,在此基础上提出一种优化的滑动平均值周期迭代法。该算法结合了滑动平均算法的抗扰特性以及周期迭代法计算变化率的功能,可满足该特定工艺的控制要求,已在CPR1000核电厂的DCS控制中获得应用。
In the process control of CPR1000 NPP, when the load change rate of the unit is over 200 MW / min, the trap response time should be within 2 ~ 10 s, and it needs to resist the disturbance of 1 ~ 2 s. In digital instrument control system (DCS), differential algorithm or periodic iterative method is usually used to calculate the rate of change of unit load according to real-time and historical load values, but the above process requirements can not be achieved. The two commonly used algorithms are simulated and analyzed, and an optimized iterative method of sliding average cycle is proposed. The algorithm combines the anti-interference characteristics of the moving average algorithm with the periodic iterative method to calculate the rate of change, which can meet the control requirements of the specific process and has been applied in the DCS control of CPR1000 nuclear power plant.