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Please contact us to get a free demo on PITOPS - Multivariable Closed-Loop System Identifier, PID Tuner, Advanced Process Control (APC) Designer and Optimizer - Artificial Intelligence (AI) based Algorithm.
Many PID control loops are not fully tuned and optimized due to lack of awareness of the potential and the resulting benefits. If PID control loop does not perform optimally, it can result with product quality reduction, off-spec products and other. Overall, the studies show that between 65 to 85 % of PID control loops can be improved. If PID control philosophy is understood clearly, it could provide tremendous benefits, control improvements and a financial rise. Knowledge of System Identification (or Model Identification) gives powerful capability to any process control or chemical engineer to:
Optimal PID controllers, appropriately designed PLC/DCS-based Advanced Process Controllers (APC) and/or Model Predictive Controllers (MPC) can help any industrial plant to:
There are a few ways how to do proper system identification and certain tools are available for this purpose, but unfortunately most of the them needs step-tests on PID OP in Manual mode (Open-Loop step-tests), and a few of them can do it by having-step tests on PID SP in Auto mode (Closed-Loop step-tests). These step tests many times are not possible, time-consuming or plant intrusive, and engineers and operators do not like them a lot. During steps-tests the plant many times will be in upset or spec-off mode, or even working at lower capacity than usual.
PITOPS from PiControl is the only technology across the globe which can do multivariable complete closed-loop system identification. The ability to identify open loop process models using completely closed loop data with PID control loops in Auto or even Cascade mode, and with APC schemes active or MPC model predictive controller ON and active is a unique and novel offering from PiControl, state of the art technology. Such functionality is helpful not only for PID tuning optimization for making PID tuning improvements but also to improve APC performance by optimizing APC parameters (like feedforward, inferential, constraint override and other APC parameters), and to maintain and improve existing Model Predictive Control (MPC) models.
The model improvement functionality uses the new and improved Artificial Intelligence (AI) based algorithm optimization technique that proves to be superior to FIR (Finite Impulse Response), ARMAX (Auto Regressive Moving Average Models with Exogenous Inputs) Box Jenkins methods, which are commonly used by all other competitors including Honeywell, Aspen, Emerson, Yokogawa, MathWorks – all process control design, DCS vendors and PLC vendors. It is capable to automatically identify one or several unmeasured process disturbances, isolate their pattern, display as a trend, and save in the Excel. Works well admits fast random noise, medium frequency drifts and slow unmeasured disturbances.
PITOPS can take past data from any PLC or DCS historian during start-up/shutdown or normal plant operation and without any additional time-consuming and intrusive step tests can identify true and accurate process models from:
All mentioned options above reduce intrusive and time-consuming plant step-tests and save the plant of running in undesirable conditions.
On the other hand, engineers still like to use not so effective old fashion PID tuning rules, where they need to conduct many time-consuming and intrusive plant step-tests, break a control chain, switch control loop modes, and eventually hope that during step-testing time plant will not be hit by unmeasured disturbance which will disturb the plant and ruin performing plant step-tests.
Also, each PID control loop has its own purpose and objective. The optimal tuning of critical loops must consider the nature of the process, how fast the control valve can be allowed to move, the nature of known and unknown disturbances and other customs issues. In any industrial plant there are PID control loops which:
Therefore, it is unreasonable to tune all PID control loops only based on the step setpoint change, like many tools do. This simplified PID tuning on a typical step setpoint change many times will produce poor PID control loop behavior sudden and unexpected process disturbances rejection, and/or control valve mechanical issues.
Except being able to do powerful system identification, PITOPS can also do multi-objective PID loop tuning. It can accurately tune PID control loops based on the following multi-objective approach:
Non-linear process gains and/or process dynamics
Now, process control user/expert can finally get optimal PID tuning parameters based on real PID loops needs and objectives, and stop the usage of trial-and-error PID tuning.
PITOPS also provides powerful capabilities for designing and implementing Advanced Process Control (APC) schemes inside of any PLC or a DCS. It helps to precisely identify process dynamics required for optimizing the following schemes:
Multiple cascade PIDs - It can optimize both slave and cascade controllers.
Some of the distinguishing and powerful features of PITOPS are listed below: