ONLINE OSCILLATION DETECTION AND ADAPTIVE CONTROL
View the Tadpole brochure.
Please contact us to get free trial software.
info@picontrolSolutions.com, Tel: (832)495-6436
Tadpole is a completely new, breakthrough product to reliably detect oscillations in any process using PiControl’s proprietary TAD (True Amplitude Detection) algorithm invention. No other competitor has access to the TAD algorithm.
Tadpole is an online software product to reliably detect oscillations in important control loops in a chemical plant. Every plant has several control loops ranging from as few as ten in a small plant to hundreds in a large complex that are considered critical. Examples of such loops are reactor temperature, distillation temperature, product purity, surge calculation in compressor, certain important valve positions, motor amps or power and many others. Oscillation of these loops because of change in plant or process conditions or excitement caused by interacting external loops or disturbances can cause the entire process to start oscillating. This can result in lost production because of inability to operate closer to constraints and it can also impact product quality.
Tadpole provides an online window which can be displayed in the control room showing the oscillation status of all important tags. A quick glance at the screen and the engineer/operator is alerted on loops that are oscillating.
The field of online oscillation detection is still very much in its infancy. PiControl’s Tadpole will reliably and unfailingly determine instability and/or hunting as soon as it is mathematically possible. PiControl’s revolutionary TAD (true amplitude detection) software coupled with other iterative online algorithms process the data effectively and fast, and make it possible to reliably detect instability and oscillations like no other technique or software available in the market.
In case 1, amplitudes are growing, this is a sign of impending instability. In case 2, amplitudes are high but constant, rather large; this is a sign of hunting.
Cases 1 and 2 are easier to flag as a problem compared to case 3.
In case 3, there are small peaks and valleys all over, as is typical in a chemical plant signal. Some of the amplitudes are high, but might be passing (temporary). Some of the smaller ones may be real and important.
Most competitor products get confused by the squiggles in the data and can miss real oscillations or report false ones.
Tadpoles’s TAD algorithm guarantees correct identification of oscillations unfailingly, irrespective of the extent of data noise and data squiggles. Tadpole’s™ capability of identifying oscillations reliably irrespective of the nature of the fast noise, medium or slow process drift is totally unique and unmatched by any competitor product.
Tadpole also alerts if the control is sluggish (too slow).
Based on the oscillation and control status, Tadpole generates a status 1, 2, 3, 4 online alarm signal. The signal meaning is as follows:
- signals OK status
- signals Hunting
- signals Instability
- signals Sluggish Control
Tadpole can be used to switch tuning automatically on critical tuning loops and also alarm operators, control engineers. Prior to Tadpole technology, detection of the problem could take much longer resulting in possible equipment shutdown, process problems and lost production or quality.
Figure 4. Unstable, Hunting and Spectrum Display
Tadpole can be easily made to trigger adaptive control schemes and rule-base control schemes to:
- Automatically change the modes of various controllers
- Activate backup control schemes
- Change PID tuning parameters
- Change Feedforward or Model-based Configuration Parameters.
PiControl provides free technical support for designing and implementing these adaptive schemes and controllers.
Tadpole is the first truly simple, powerful and practical adaptive control solution for the practical control room environment.