Algorithms for Quick Calculation of Transition Processes at Asymmetric Modes of Multi-Machine Electrotechnical Systems with Asynchronous Drives

The article discusses mathematical models and algorithms for calculating electromechanical transients with unbalanced power modes of multi-machine electrical systems with induction drives. The proposed algorithms are the result of the development of the previously developed method and algorithms for calculating transients under symmetric modes. The algorithms are focused on the calculation of the modes of systems with an open network structure characteristic of industrial power supply system. This allows you to use direct counting methods and to avoid the use of iterative procedures and their numerical calculation errors. The developed algorithms are implemented in special SAD software, which was tested on the example of a several electrotechnical systems of oil and gas manufacture. The high speed of the calculation of the electromechanical processes of multi-machine electrical systems under asymmetric modes arising from short circuits in electrical networks is confirmed. An example of calculating the stability of an electrical system under symmetric and asymmetric modes is given.