Optimization of Control Algorithms for Frequency Drives of Synchronous Motors in Unified Power System

The study of various control methods for variable-frequency drives of powerful synchronous motors is performed and an effective limitation of starting current is shown in comparison with direct and soft starts. Simplified models of scalar and vector control systems for variable frequency drive have been developed for calculations of unified and autonomous power systems and their parameters have been optimized. Based on transient calculations, it is proved that application of frequency-controlled drive allows to achieve required limitation of starting motor current and at the same time develop a sufficient starting torque, including under load, in the conditions of large gas condensate field power supply. The features of starting characteristics of synchronous motors with various load functions (constant, quadratic, etc.) are shown.