增量式PID控制算法在大型调相机中的应用

Application of Incremental PID Control Algorithms in Large Synchronous Condensers

结合泰州300 MVar双水内冷调相机工程基建调试,介绍了采用典型增量式PID控制方法实现的空气、润滑油以及内冷水温度控制。还介绍了融合逻辑切换和启动低限功能的阶跃增量式PID控制,其在循环水温控制中的效果类似于开环控制。相比传统火电广泛应用的位置式PID控制,增量式PID控制降低了稳态控制精度,提高了控制回路的稳定性,有效降低了执行机构的故障率,提高了调相机设备的本质安全属性,更加契合“无人值守”的运行要求。结合泰州300 MVar双水内冷调相机工程基建调试,分析了增量式PID控制的特点,为热工技术人员快速掌握调相机自动控制系统运维提供参考,对新一代“无人值守变电站”的建设和实施也具有一定的指导意义。

Combining with the capital construction debugging of Taizhou 300 MVar dual-water internal cooling Synchronous Condensers project,this paper introduces the temperature control of air,lubricant and internal cooling water using typical incremental PID control method.The step incremental PID control,which integrates logic switching and low-limit starting functions,is also introduced.Compared with position-based PID control widely used in traditional thermal power plants,incremental PID control reduces the steady-state control accuracy,improves the stability of the control loop,effectively reduces the failure rate of the actuator,improves the intrinsic safety attributes of the condenser equipment,and more in line with the operation requirements of unattended.