Intro4u2u

SMOC is Shell Global Solutions’ Multivariable Optimisation and Control suite of software packages.  MOC provides the tools necessary to design, implement and maintain multivariable Advanced Control strategies to effectively improve plant stability and maximise plant profitability for the Hydrocarbon Processing and Chemicals industries. Key characteristics of SMOC:
• Highest Uptimes in industry (i.e. highest benefits)
• Use of unmeasured disturbance models and grey box models to include apriori process know how resulting in high robustness
• Easy to use design and simulation kit (off line)
• Embedding in DCS (no special interface software or doubling of databases) Shell Global Solutions Advanced Control engineers,with the support of in-house instrumentation and process experts, offer the
whole spectrum of services for successfully implementing SMOC, including benefits study,
control system engineering, commissioning and applications maintenance.
Applications
SMOC has been successfully applied to over 430 applications world-wide on process units such as
Crude Distillation, Fluid Catalytic Cracking, Hydrocracking, Lube Oil, Styrene, Ethylene Oxide
/Ethylene Glycol plants and other major refinery and petrochemicals units. SMOC is recommended
to safely push a unit towards its constraints, maintain key operating variables at desired targets, while maximising the unit profit function with all available operating handles.

Product Description
SMOC involves the following integrated software modules :
• AIDA off-line modelling package :
AIDA (Advanced Identification and Data Analysis) is a Windows based package used to process dynamic plant test data and derive the model needed by SMOC. User-friendly help menus, graphics and calculated statistics allow the model to be quickly built and validated. AIDA has been designed and tested to be robust in handling noise and disturbances typically present in actual plant test data sets.
• PC-SMOC off-line controller design
package :
PC-SMOC is a Windows based package, integrated with AIDA, to design, test and build SMOC controllers. The process dynamic model is generated by AIDA. Alternatively, the model may be built using the Graphical Model Builder. PC-SMOC allows the user to simulate the controller behaviour
to test the tuning, robustness to model errors and optimisation performance. The final stage in the off-line design is the creation of the SMOC controller file, for use by the on-line controller.
• SMOC on-line controller :
The on-line controller incorporates all functions required for the operation of the controller in real time. This includes signal validation, initialisation, mode shedding, standard operator and engineer interface, and controller engine. The same SMOC on-line controller is available in versions running on different platforms either at the DCS level (Honeywell AxM/TPS, Foxboro IA, Yokogawa CS) or in a process computer system with SETCON, Info Plus, PROSS 2 or OSI’s PI
TECHNOLOGY
SMOC is a model based multivariable predictive controller, with the following special features :
• Economic optimisation capability :
SMOC allows the user to continuously optimise his defined economic function as part of
the control calculation.
• Simple on-line tuning of the controller performance by specifying the desired speed of response for set point tracking, disturbance
rejection and feed-forward control.
• Handling of intermediate variables for enhanced controller performance :
fast responding intermediate variables, that provide an early indication of the future
behaviour of the controlled variables, can be included in the controller to allow more robust
and timely control actions.
• Efficient use of CPU resources by the on-line controller :
to minimise on-line CPU usage, the controller matrix is pre-calculated off-line, and use is made on-line of a Relaxation algorithm, to efficiently resolve constrained optimisation, and control the execution time.

DeltaV System-wide

* Any Size System. DeltaV I/O capacity doubles to 30,000 I/O. The DeltaV system can directly connect 120 nodes. Dozens of additional remote workstations can be connected.

* Remote Workstations. Engineer and operate your DeltaV system via remote networks including local area networks, wide area networks, dial-up, microwave, and satellite communications. Remote workstations can be connected via your ProfessionalPLUS Station or Application Station, providing you dozens of additional windows into your process.

* Simplified, System-Wide Controller Licenses. Delivers simplified licensing of controller software. Now only one control license exists for the entire system. No longer will you purchase and manage multiple licenses for each controller in your system. Instead, you purchase a single, system-wide license for control no matter how many controllers you have in your system. And you have the freedom of landing your I/O where it makes the most sense, with no penalty. Also, your older sequence, monitor and logic licenses get upgraded to be included in the system control license! Need batch control? No problem: purchase one more system-wide license to add batch control-easy!

DeltaV Hardware

* Profibus DP Interface. Communicates easily with Profibus DP devices. Signals from these devices are treated just like classic I/O, so control is completely transparent. No mapping! Add devices online, without interrupting control-easy!

* AS-i Interface. Add inexpensive, discrete AS-i devices easily into the DeltaV system. All signals from the devices are treated as I/O signals so they, too, are transparent. No gateways, no mapping! Auto-sense your field devices, auto-address them with your own signal name and you’re done!

* Multifunction Card. Provides capability for pulse inputs up to 50 kHz and provides accumulation functionality. It’s a great convenience for specialty applications.

* Redundant Fieldbus Power. Delivers secure, redundant power to the fieldbus segment with this new power conditioner. Energy limitations ensure non-incendive installation.

* I/O G3 Certification. Complies with ISA G3 corrosion specifications with superior electronic components and the use of conformal coating.

* M5 Plus Controller. Provides a 20 percent performance increase over the M5 controllers for DeltaV v4.2 and version 5 software. This controller works great with v3.2-for performance realization, simply upgrade your system to v5.1.

DeltaV Software

* Tip of the Day. Adds helpful hints to the DeltaV Explorer, Control Studio, and Recipe Studio, giving you suggestions on easier ways to more efficiently work with your DeltaV system.

* DeltaV Operate. Provides state-of-the-art operator graphics with a whole new way to configure! The display configuration includes familiar technologies such as: Visual Basic for Applications for display scripting, and the Explorer look and feel for navigation to easily find and modify displays. If you’re operating remotely or ready for the next generation of operator interfaces, DeltaV Operate is for you.

* System Alarm Management. Provides an application with a single view to compare, analyze and modify alarms. All of the modules within a unit or area are displayed, with only the alarms shown. Take advantage of multi-item select to change the alarm configuration of several alarms across multiple modules at the same time.

* Easy, Advanced Alarming. Eliminates nuisance alarms easily. Operators can suppress alarms caused from faulty equipment and view all of the suppressed alarms in a single summary. Engineers can easily configure alarm enable and delay times with DeltaV conditional alarming. Simply select conditional alarming for any standard DeltaV alarm, and enter your values-no calculations to write or complex logic to maintain!

* Unit Alarm Display. Adds units under areas in the DeltaV Explorer for alarm management. These units summarize the alarms in modules under them. Pre-built unit alarm faceplate and detail displays show the highest priority alarms for the modules within the unit-in one easy key click.

* DeltaV Remote Access Service. Operate, engineer and diagnose your DeltaV system from your desktop. You are no longer limited to the system workstations to access the DeltaV system, saving you time and effort. DeltaV Remote Access Service is specially designed to efficiently serve data over slower, expensive WAN connections-ideal in applications where satellite communications are required.

* Easier Engineering. Makes engineering the DeltaV system even easier. Version 5 adds an Undo function and the ability to add URLs into the engineering applications like Control Studio, DeltaV Explorer, and Recipe Studio. Now you can easily browse to custom help, operating procedures, loop diagrams, and more.

* Integrated Equipment Hierarchy. Completely implementing S88.01 equipment and procedure models, the DeltaV system’s class-based development tools dramatically reduce your costs for software design, implementation, test, validation, and maintenance.

* Engineering Tools Performance. Improves performance for verifying class-based unit modules and loading recipes and provides an overall improvement in engineering tools. A more efficient mechanism for database access speeds up the database access function for more rapid engineering.

* Drawing Tools. Improves the presentation of your documentation in Control Studio, with a palette of drawing tools similar to that in Microsoft PowerPoint. Now loop sheets may be done in the system.

* Signal References. Speeds up faultfinding and improves documentation. You can now turn on a preference in Control Studio to see the source and destination of a signal, improving your readability of the control strategy.

* SFC Transition Viewer. Reduce downtime, speed up faultfinding, and maximize your debug capabilities by viewing SFC transitions in online mode. Now commissioning is even faster.

* Tailor-made Configuration. Not using buses? Not using batch? With System Preferences, you can now tailor the DeltaV system to suit your needs. By selecting to hide functionality, DeltaV configuration shows you only the options that are valid for your application.

* Quicker Navigation. Adds a shortcut bar in the DeltaV Explorer, which behaves just like the shortcut bar in Microsoft Outlook. Now you have fast, easier navigation, especially for larger configurations.

* HTML Help. Books Online, now in HTML format, is better organized, making searches easier and allowing you to link in user-defined HTML help files.

* Web Server. Adds real-time trending with adjustable time scales and navigation links for easier browsing.

DeltaV Advanced Control

* Now standard! DeltaV Fuzzy is now a standard part of every DeltaV system that includes a system-wide Control software license. You no longer need an additional license to use the Fuzzy Logic function block. In addition, DeltaV Tune for tuning both PID and fuzzy logic loops is now a standard part of the ProfessionalPLUS Station software suite.

* DeltaV Tune Stability Analysis. This new feature adds stability analysis and loop simulation features that allow you to adjust tuning parameters-so you can set the loop for optimal response to setpoint or disturbance changes or to a stable control setting unique to your application.

* Multivariable, Model-based Controller. Integrates the SMOC multivariable, model-based optimizing controller when you purchase MDC Technology’s SMOC process optimization product. The SMOC controller running in a DeltaV Application Station communicates seamlessly to SMOC composite blocks configured in Control Studio. Graphic dynamos and a built-in MPC operator application eliminate operator interface development.

DeltaV Batch

* Campaign Manager. Provides an optional, easy-to-use interface for creating, modifying and executing campaigns. Campaign Manager also provides a comprehensive campaign execution history that is automatically stored in the Batch Historian database, along with all of the associated batch historical data. Campaign reports may be generated using the standard DeltaV Batch Historian reporting tools.
View the recipe, formula, batch IDs, and equipment defined for any campaign. See the current status of any batch, as well as any modifications made to a particular batch.
Campaign Manager includes a comprehensive API that lets you develop MES/ERP applications to interact with the Campaign Manager and programmatically create campaigns.

* Electronic Signature Support. Secures your batch operations by automatically requiring a user name and password. Operator confirmation and verification options support the use of electronic batch records. Now you can request an electronic signature (confirmation), as well as a secondary signature (verification) for Batch Operator Interface actions, Campaign Manager actions, and responses to operator prompts. These signatures are stored, along with the action that was performed, as part of the batch’s history.
This option is configurable and tightly integrated with DeltaV security and meets electronic signature requirements as outlined in the United States Food and Drug Administration 21 CFR Part 11.

* Configuration Audit Trail. Controls, manages, and tracks changes in the DeltaV configuration database. Also supports electronic recordkeeping per 21 CFR Part 11.

* Ordering Batch Made Easy. Three levels of batch licensing most typically used eliminate the need to order components separately:
o Basic Batch — includes Batch Executive
o Advanced Batch — includes Batch Executive, Batch Historian and Soft Phase Server
o Professional Batch — includes Batch Executive, Batch Historian, Soft Phase Server and Campaign Manager.
* Batch Historian. Now runs as an NT service for added security, so it can start automatically when NT is started and remains running even when a user logs off the system.

* Batch Operator Interface. Provides operators with even more information about what the batch is doing by displaying comments, transition descriptions and step descriptions in the graphical view of a recipe. Formula information has also been added to the displays in Batch Operator Interface.

* Electronic Operator Log. During batch execution, operators can enter comments that are automatically captured and stored as part of the batch’s history.

DeltaV Languages

DeltaV version 4.2 software is now available in French, German, Japanese, Russian, simplified Chinese, and traditional Chinese.*

*Check with your local sales office for availability.

The objective of this paper is to address some of the theoretical and practical issues related to the implementation of two stage model predictive control schemes such as LP-MPC and QP-MPC. Single stage QDMC has the drawbacks of steady state offsets, inconsistent setpoints and does not take into account economic objectives. The addition of another stage on the top of QDMC is used to address these problems. Results of the application of two stage MPC to the Shell Challenge problem are presented. A comparison is made with the single stage conventional QDMC and some interesting observations are reported. Stability and dynamic performance issues are also considered in this paper. 1. Introduction Control approaches that use embedded process models and solve a dynamic optimization problem on-line at each control execution are generally classified as “Model Predictive Control (MPC)”. Cutler and Ramaker (1979) and Richalet et al (1978) introduced MPC to process control engineers. Since then …

Model predictive control (MPC) is used extensively in industry to optimally control constrained, multivariable processes. For nonsquare systems (with more inputs than outputs), extra degrees of freedom can be used to dynamically drive the process to its economic optimum operating conditions. This is accomplished by cascading a local linear programming (LP) or quadratic programming (QP) controller using steady-state models. Such a cascade control scheme (LP-MPC or QP-MPC) continuously computes and updates the set points used by the lower-level MPC algorithm. While this methodology has been in use by industry for many years, its properties have not been addressed in the literature. The properties of such cascaded MPC systems are analyzed from the point of view of implementation strategies, stability properties, and economic and dynamic performance. Some theoretical results on stability are derived along with a case study involving the Shell control problem.