Principles and stages of creation of automatic control systems with a model of complex technological processes

Abstract

The object of this study is an effective approach to designing automatic control systems with a model of complex technological processes, which include interrelated and complementary stages from the formulation of the task to the implementation of the control system at the facility. It includes a set of measures, starting with the analysis of the process in its hardware design with the construction of an information and logical scheme to the development of all types of security and commissioning. The main problem in the implementation of a control system with a technological process model is the limited ranges of adequacy of mathematical models. Therefore, when changing the load on the unit, changing external and internal perturbations, it is necessary to constantly ensure the necessary level of adequacy of the models. It is proposed to use a combined model as a mathematical model of the control object, combining the advantages of analytical and experimental-statistical models. This makes it possible to significantly expand the information base of the resulting model. A simple and effective iterative algorithm for calculating this model is also proposed. It includes sequential steps to determine the parameters of the model by basic dependences (the deterministic part of the model), followed by clarifying them according to the current data from the object (experimental statistical part of the model). The effectiveness of the approach is confirmed by the example of ASC TP of the ammonia synthesis column. By improving the accuracy of determining the control parameters and narrowing the range of their change around the optimal value, the volume of ammonia release increases by 5–8 %. The application of the described approach on the example of the development of an automatic control system for the technological process of ammonia synthesis confirmed the economic feasibility of implementing the proposed solutions

Use of additive test methods in the simulation of the methanol synthesis column for the creation of a control system from the model

“…Determining the cost of cold bypasses for each shelf with a synthesis column catalyst is the result of the algorithm for calculating extreme control parameters. This algorithm is based on the mathematical model (9). Based on the optimality condition (10), the optimality criterion is formed.…”

“…The work [9,10] proposed an algorithm for the operation of the control system with a model. However, the methods of implementation and adjustment of control systems with the model are not indicated, because when developing a control system with a model of a methanol synthesis column in the production of methanol, the issue of the possibility of practical implementation of the proposed solutions is important.…”

Substantiating the expediency of using hydrogen fuel cells in electricity generation

“…Noise can come from a cooling system, compressors for fuel supply, etc. ; its level is insignificant [18];…”