CONTROL METHOD OF HYDRAULIC CONDITIONS OF COMPRESSOR SHOP WITH OPTIMUM LOAD DISTRIBUTION BETWEEN GAS COMPRESSOR UNITS Russian patent published in 2012 - IPC F04D27/00 F02C6/08 

FIELD: machine building.

SUBSTANCE: invention refers to control of gas compressor units during gas transportation. Specified rotor speed values of injectors are determined as per ratio in the range of allowable values of load change of each gas compressor unit considering the limitation of maximum allowable load difference between neighbouring gas compressor units. Arbitrary load ratio specified by the operator is included in calculation, or load ratio corresponding to minimum fuel gas consumption is calculated as per optimisation method. Optimisation method of multidimensional models is applied at limitations for calculation of optimum load ratio. Search of optimum load ratio of injectors is performed within the whole range of allowable frequency values of injectors by considering limitations of maximum possible difference between loads of injectors. In the calculation the change in fuel gas consumed with the unit relates to change of energies of thermal interaction, mechanical interaction and gas dynamic interaction of working media in turbine according to energy saving principle. Change in the above four types of energy by means of mathematical models is expressed through the change in parameters measured in automatic control system of gas compressor units. As per the measured data and model relations there built are the main models of energy interaction in gas compressor units in current modes and a number of possible modes of various rotation frequencies of gas compressor units. As per model of energy interaction there calculated are values of volume and commercial efficiency of gas compressor unit, which correspond to those modes, as well as fuel gas consumption. Obtained sets of values are included in static relations. The latter and limitations are processed by applying optimisation calculation method, at operation of which there calculated are assignments of rotation frequencies of injectors by means of non-linear programming method, assignments of frequencies are supplied to control system of gas compressor unit as control action. Maximum allowable working limits of each individual gas compressor unit are calculated continuously as per functional relations, and creation of model relations of energy balance for optimisation calculation is performed momentarily for optimisation calculation.

EFFECT: enlarging the possibility of load distribution at a shop, and application of optimisation method in the whole operating range of gas compressor unit.

9 dwg