Control Analysis and Design Features of EASY5

EASY5 is the result of a development effort of more than 10 years duration. Analysts at Being perceived the need for a single software tool to support both nonlinear simulation and linearized analysis of dynamic systems. Prior to the development of EASY5 it was necessary to build and maintain two models of a dynamic system: a linearized model used for controls analysis and design and a nonlinear model used to verify the linearized design. Use of EASY5 allows the analyst to prepare a single model of the system to be analyzed. Not only does this reduce the time required to build and maintain models but it allows the linearized analysis methods of EASY5 to be applied to verification of the model itself before design work begins. One of the major applications of EASY5 has been in support of EPRI´s SysteMMS, a modular modeling system for simulation and analysis of fossil and nuclear power plants. Under the sponsorship of EPRI, Boeing Computer Services (BCS) developed a library of models which facilitates the use of EASY5 as part of SysteMMS. This paper presents an overview of the capabilities of EASY5, a brief description of the EASY5/SysteMMS library, and an example of application of EASY5 to designing a controller for a deaerator.