In connection with reduction of volumes of transporting of gas through the gas-transport system of Ukraine the issue of the day is the rational loading of the compressor stations taking into account the technical state of gascompressor units. The mathematical model was developed in the article on principles of fuzzy logic, that gave an opportunity to define the technical state of gascompressor units that are working in parallel taking into account such parameters as the productivity of supercharger, expense of fuel gas, pressure and temperature on an entrance, pressure and temperature on the exit of centrifugal supercharger, temperature of products of combustion on an exit from the turbine of LP, frequency of rotation of shaft of the supercharger, temperature and pressure of environment, vibrospeed and vibroacceleration, speed of accumulation product of triggering in agile olive, concentration oxide nitrogen and carbon in exhaust-gas. The expense of fuel gas, that is measured by facilities of regular automation, depends on many factors such as atmospheric pressure, ambient temperature, physical and chemical properties of fuel gas, technical state and type of turbo-engine. All that grounds to consider the expense of fuel gas an unclear value. Experimental researches on the base of Bohorodchany compressor station showed, that unclear value the "expense of fuel gas" has Gauss function of belonging. Therefore the task of choice of optimal amount of aggregates working in parallel is formalized as a task of integer of the linear programming, the criterion of optimality in that is a cost of fuel gas that consumes the compressor station taking into account the technical state of gascompressor units and unclearness of expense of fuel gas. Efficiency of the worked out method is confirmed by calculations that are based on industrial data received  during exploitation of Bohorodchany compressor station.

Method of the optimal control of the natural gas compression process by a compressor station, which is equipped with gas pumping units with a gas turbine drive, has been developed. The parallel scheme of connection of gas pumping units working on the general collector is considered. The cost of fuel gas taking into account the power of nitrogen oxide emissions into the atmosphere is chosen as the criterion of optimality. This takes into account the restrictions on technological parameters and the planned task for the transportation of natural gas. The formed problem is divided into two subtasks - the choice of the optimal number of parallel units in each of the subgroups and determining the optimal mode of operation of each unit in the group. Formalization of optimal control problem of GPA operation takes into account the uncertainty inherent in the process of natural gas compression. For this purpose, the apparatus of fuzzy algebra was used, which made it possible to take into account the inaccuracies that arise both as a result of measuring technological parameters and as a result of processing the obtained data on the technological process. The optimal control system is integrated into the upper level (dispatcher) and is an integral part of the overall control system of the GPA and has a hierarchical structure. At the lower level there are measuring devices of technological parameters, which are a source of information for the upper level where the solution of optimization problems takes place. The developed methods formed the basis of the algorithmic and software of the computer system for optimal control of a separate unit of the compressor station, which can be integrated into the existing automated system.