METHOD OF NUMERICAL CALCULATION OF ELECTROMECHANICAL TRANSIENT PROCESSES IN ASYNCHRONOUS ENGINES

Abstract

Article is devoted to improvement of a numerical method of calculation of electromechanical transient processes in asynchronous engines. Electromechanical transient processes can be very long that leads to considerable time of calculation and accumulation of an error of calculation when even using modern software. The purpose of this work is development of the improved method of calculation of transient electromechanical processes in asynchronous engines which is implemented by the simple, but quick-acting computer program. Circuit interpretation of the developed method is offered. As the system of the equations which are describing dynamic of the asynchronous engine includes products of currents 1st rotor and 2nd stator this system is nonlinear one. On the current step of integration k the product of values of two currents 1 and 2 is considered as average value: variable – current 1 with the coefficient which is equal the of the value current 2 taken from the previous step of integration and variable – current 2 with the coefficient of the value current 1 from the previous step. For more accurate definition of this product on each step of integration 2-3 iterations are carried out and it is enough. The equations of a numerical method of integration of the differential equations are united with the system of the equations describing electromagnetic and mechanical processes. Such way allows using implicit method of numerical integration of the differential equations directly.

When process in the asynchronous engine is calculated by the offered method processor time is reduced moreover 35% in comparison with calculations by the known methods.