Modernization of Control Systems to Maintain Plant Reliability and Economy in a Flexible Operating Regime

1984 ◽  
Vol 198 (1) ◽  
pp. 7-12
Author(s):  
G Wronski ◽  
R G Wilson
Keyword(s):  
Control Systems ◽  
Operating Regime ◽  
Economic Consequences ◽  
Plant Performance ◽  
Data Handling ◽  
Controls Systems ◽  
Display Systems ◽  
Operating Capability ◽  
Made In

The bulk of the electricity generated within the Central Electricity Generating Board (CEGB) is produced from units with a capacity of 500 MW and above. A further 10.2 GW of generation is due to be commissioned in the next few years. Hence those 500 MW units with the highest generating costs now need to develop a flexible operating capability. An attempt is made to define the effect on plant performance of improving the plant automatic controls systems and enhancing the amount and presentation of information to operating staff. The consequences on plant performance of providing minute to minute regulation against grid frequency are given. The economic consequences of running at off design conditions are evaluated and related to the benefits of modernizing the control and display systems on the 500 MW units. Examples are given of the improvements being made in instrumentation and data handling systems.

Data Management in an Epidemiological Study : Experiences from the Iowa 500 Field Follow-up and Family Study

1980 ◽  
Vol 19 (01) ◽  
pp. 37-41
Author(s):  
R. F. Woolson ◽  
M. T. Tsuang ◽  
L. R. Urban
Keyword(s):  
Data Management ◽  
Epidemiological Study ◽  
Family Study ◽  
Data Sets ◽  
Data Handling ◽  
Management Decisions ◽  
Numerous Data ◽  
Made In

We are now conducting a forty-year follow-up and family study of 200 schizophrenics, 325 manic-depressives and 160 surgical controls. This study began in 1973 and has continued to the present date. Numerous data handling and data management decisions were made in the course of collecting the data for the project. In this report some of the practical difficulties in the data handling and computer management of such large and bulky data sets are enumerated.

scholarly journals Progress on Powertrain Verification Challenge with C2E2

10.29007/1kq2 ◽  
2018 ◽  
Author(s):  
Chuchu Fan ◽  
Parasara Sridhar Duggirala ◽  
Sayan Mitra ◽  
Mahesh Viswanathan
Keyword(s):  
Rate Of Convergence ◽  
Control Systems ◽  
Hybrid System ◽  
State Machines ◽  
Powertrain Control ◽  
Verification Tool ◽  
Discrepancy Rate ◽  
System Verification ◽  
Made In

In this paper, we present the progress we have made in verifying the benchmark powertrain control systems introduced in the last ARCH workshop. We implemented the algorithm for computing local discrepancy (rate of convergence or divergence of trajectories) reported in the hybrid system verification tool C2E2. We created Stateflow translations of the original models to aid the processing using C2E2 tool. We also had to encode the different driver behaviors in the form of state machines. With these customizations, we have been successful in verifying one of the easier (but still challenging) benchmarks from the powertrain suite. In this paper, we present some of the engineering challenges and describe the artifacts we created in the process.

Modelling Economic Consequences of ICT Infrastructure Failure in Support of Critical Infrastructure Protection Policies

2013 ◽  
pp. 115-138
Author(s):  
Olaf Jonkeren ◽  
David Ward
Keyword(s):  
Critical Infrastructure ◽  
Large Body ◽  
Economic Consequences ◽  
Critical Infrastructures ◽  
Critical Infrastructure Protection ◽  
Infrastructure Protection ◽  
Modelling Methodology ◽  
Infrastructure Failure ◽  
Ict Infrastructure ◽  
Made In

There is a large body of work and effort been made in the modelling of critical infrastructures (CI’s) by academia, enterprises, stakeholders, operators, etc.; however, their endeavours have received mixed success so far. This can be traced back to several difficult and historical hurdles in CI modeling such as the chronic unavailability of reliable and recognised data, the specificity of the resulting model, and therefore, its application, the underlying mathematics, narrow-mindedness and lack of awareness of the consequences of infrastructure failure, the recognition and dissemination of the modelling methodology-knowledge, etc. Consequently, bridging theory and application and providing tools for analysing CI’s is key to ensuring that such modelling delivers the benefits voiced and satisfies the needs raised. This chapter sets out to tackle several of these issues.

Understanding the physical and economic consequences of attacks on control systems

2009 ◽  
Vol 2 (3) ◽  
pp. 73-83 ◽  
Author(s):  
Yu-Lun Huang ◽  
Alvaro A. Cárdenas ◽  
Saurabh Amin ◽  
Zong-Syun Lin ◽  
Hsin-Yi Tsai ◽  
...  
Keyword(s):  
Control Systems ◽  
Economic Consequences

Recent Technological Advances in the Control and Guidance of Ships

1994 ◽  
Vol 47 (2) ◽  
pp. 236-258 ◽  
Author(s):  
N. A. J. Witt ◽  
R. Sutton ◽  
K. M. Miller
Keyword(s):  
Control Systems ◽  
Intelligent Control ◽  
Adaptive Systems ◽  
Control Method ◽  
Control Strategies ◽  
The Past ◽  
Technological Advances ◽  
Ship Control ◽  
Made In ◽  
Modern Control

Over the past seventy years many advances have been made in the field of ship control. Early developments by Sperry and Minorsky on proportional controllers have led to today's modern control systems which have interfacing capabilities with position fixing equipment.This paper presents a brief historical summary of the methods employed in ship control from early proportional devices through the range of adaptive systems and concludes with details of a possible future control method known as intelligent control.Intelligent control consists of three methodologies: expert, fuzzy and neural. An investigation and comparison of the methodologies will present possible future control strategies.

User Interface Description of a Gas Turbine Control System

1986 ◽  
Author(s):  
M. Sreetharan ◽  
J. Fistere
Keyword(s):  
Control System ◽  
User Interface ◽  
Control Systems ◽  
Gas Turbine ◽  
Video Display ◽  
Diagnostic Features ◽  
Control Interface ◽  
Operator Interface ◽  
Made In ◽  
Plant Control

Human factors must be given primary consideration in the design of today’s control systems. It is essential to take into account the characteristics of the human operator, the plant control requirements and the inherent characteristics of the control system. This paper discusses the objectives of the control interface development task for a turbomachinery microprocessor based control system. It discusses the design issues raised during development, the choices made in the early structuring of the system and selected implementation details that affect the operator interface. Subjects discussed include: • Overall Philosophy and Console Arrangement • Pushbutton vs Keyboard Functions • Video Display Philosophy and Organization • Ladder-Diagram Graphic Symbols • Keyboard Command Philosophy and Structure • Diagnostic Features and Maintainability

Ten Years of Digital Computer Control of Combustion Turbines

1981 ◽  
Vol 103 (1) ◽  
pp. 54-59
Author(s):  
R. A. Yannone ◽  
J. F. Reuther
Keyword(s):  
Solid State ◽  
Control Systems ◽  
Digital Computer ◽  
System Performance ◽  
State Of The Art ◽  
Computer Control ◽  
Design Criteria ◽  
Total System ◽  
Data Handling ◽  
Historic Data

This paper establishes the design criteria for the digital computer control systems first produced in 1969, and currently in the tenth year of history for startup, control, and monitoring of combustion turbine units in the 25–125 MW range, reviews the advantages of digital control and the fall-out obtained from the application of an advanced state-of-the-art control in the area of diagnostics and historic data handling, reviews the integration of the digital computer back-up system, composed of a solid-state fuel scheduler and logic sequencer provided for total system performance and reliability, and discusses the feasibility of a computer retrofit using existing software with the latest state-of-the-art microprocessor emulator.

Economic Consequences of Two Drug-use Control Systems in a Teaching Hospital

1988 ◽  
Vol 45 (11) ◽  
pp. 2329-2340
Author(s):  
Cheryl E. Clapham ◽  
Charles D. Hepler ◽  
Thomas P. Reinders ◽  
Mark E. Lehman ◽  
Lawrence Pesko
Keyword(s):  
Drug Use ◽  
Control Systems ◽  
Teaching Hospital ◽  
Economic Consequences

Influence of Advancements in Gas Turbine Control Systems on Gas Turbine and Combined-Cycle Performance Test Correction Curves

2011 ◽  
Author(s):  
Thomas P. Schmitt ◽  
Christopher R. Banares ◽  
Benjamin D. Morlang ◽  
Matthew C. Michael
Keyword(s):  
Control System ◽  
Boundary Conditions ◽  
Control Systems ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Performance Test ◽  
Combined Cycle ◽  
Plant Performance ◽  
Control Algorithms ◽  
Technical Accuracy

Many modern power plants feature gas turbines with advanced control systems that allow a greater level of performance enhancements, over a broader range of the combined-cycle plant’s operating environment, compared to conventional systems. Control system advancements tend to outpace a plant’s construction and commissioning timescale. Often, the control algorithms and settings in place at the final guarantee performance test will differ significantly from those envisioned during the contract agreement phase. As such, the gas turbine’s actual performance response to changes in boundary conditions, such as air temperature and air humidity, will be considerably different than the response illustrated on the initial correction curves. For the sake of technical accuracy, the performance correction curves should be updated to reflect the as-built, as-left behavior of the plant. By providing the most technically accurate curves, the needs of the new plant performance test are satisfied. Also, plant operators receive an accurate means to trend performance over time. The performance correction curves are intended to provide the most technically accurate assurance that the corrected test results are independent of boundary conditions that persist during the performance test. Therefore, after the gas turbine control algorithms and/or settings have been adjusted, the performance correction curves — whether specific to gas turbines or overall combined-cycle plants — should be updated to reflect any change in turbine response. This best practice maintains the highest level of technical accuracy. Failure to employ the available advanced gas turbine control system upgrades can limit the plant performance over the ambient operating regime. Failure to make a corresponding update to the correction curves can cause additional inaccuracy in the performance test’s corrected results. This paper presents a high-level discussion of GE’s recent gas turbine control system advancements, and emphasizes the need to update performance correction curves based on their impact.

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