In dispatching activity, along with the basic function of process control, a significant place is occupied by decision-making in real-time control of gas flows in the main gas pipeline. At present, decision-making depends on the qualification of dispatch personnel, as there are no software support tools yet. However, there are ways of solving such problems with the involvement of elements of the theory of fuzzy sets (TFS) in combination with the theory of planning of experiment (TPE). The task of the dispatcher is to process the received information and form transportation flows taking into account seasonal, daily changes and economic efficiency of the system. To solve this task, it is necessary to analyze the state of flows at all sections throughout the pipeline and to carry out their redistribution. The purpose of this article is to identify the factors that form the basis of the information control system (ICS) in the formation of gas transportation flows of main gas pipelines (MG).
The aim of this work is to create a methodology for building a knowledge base in a fuzzy environment of information-analytical complex of dispatcher control of gas flows as an analytical expression for assessing the probability of the system going beyond the permissible limits. Currently, the main thing in decision-making is the qualification of the operational dispatch personnel, software to support decision-making so far does not exist. Making any decision is inherently a multidimensional problem, and the factor space contains "fuzzy" information. Methodology for building information-analytical complex provides as the main step - the creation of a knowledge base of decision-making in the form of an analytical expression. The equation is necessary to build a fuzzy logic regulator in the intelligent ACS of decision-making in gas flow management, and can also be used to create an "adviser to the dispatcher" and simulator.
The trunk pipeline system serves to transport gas and consists of the trunk pipeline, compressor stations, underground storage facilities and the gas distribution network. To determine the price and quantity of the supplied gas, it is necessary to measure the caloric value of the gas at the consumer. A gas quality control subsystem and a gas flow regulation circuit are being developed. The subsystem is an integral part of the ACS of the gas distribution station and consists of three main hierarchical levels. The upper level of the gas quality control subsystem is based on the SCADA system CIMPLICITY PE/HMI. A graphic interface is used for visualization of the main gas parameters, for convenience of control as well as for modification of the entered information. The middle level is built on the basis of a Modicon Micro medium-class PLC. The lower level consists of pressure, temperature, flow, humidity and chromatograph sensors.
