反向响应过程抗负载干扰PID控制回路性能评估

Assessment of Inverse Response Process PID Control Loops Performance for Load Disturbance Rejection

摘要:

反向响应过程广泛存在于化工领域中,但针对反向响应过程的性能评估研究较少；针对一类二阶时滞反向响应过程,通过幂级数展开的方法简化了对象模型,然后研究其抗负载干扰PID控制回路性能评估问题；根据DS-d控制原理获取期望闭环传递函数以及PID控制器参数,推导干扰模型为阶跃情况下的PID控制回路累积绝对误差(IAE)性能基准值,并将其推广到斜坡输入以及一般输入情形,为不同干扰类型情况下的反向响应过程建立通用化的IAE性能评价标准；仿真结果验证了所提性能评估算法的正确性以及通用性。

Abstract:

Although inverse response process exists widely in the field of chemical industry, studies for the performance assessment of it are not very common. The inverse response process with second order plus time-delay model is simplified by a truncated power-series expansion, then assessment of PID control loops performance for load disturbance rejection is discussed. The integrated absolute error(IAE) performance benchmark is established from closed-loop responses with step type of load disturbance changes, while the desired closed loop transfer function and the PID controller parameters is acquired through the DS-d control principle. In addition, the general IAE performance benchmark for different types of load disturbance is put forward for inverse response process subject to ramp and other general types of load disturbance changes. Numerical example is employed to demonstrate the effectiveness and universality of the proposed performance assessment algorithm.