Автономная станция электроснабжения на основе асинхронного генератора с фазным ротором и преобразователя частоты малой мощности

Abstract

Currently, asynchronous and synchronous generators with two-link full power frequency converters are the main options to design highly efficient sources of 3-phase voltage with an internal combustion engine (ICE) as a prime mover and a variable speed as a function of the load. It is required to develop and study the effectiveness of the use of an autonomous power supply station with a variable speed based on a low-power frequency converter to reduce its cost with the possibility of saving ICE fuel by controlling the frequency as a function of the load. The description of the power plant and its control system is made at the structural and functional level. The study of its characteristics is carried out by means of computer simulation in the Delphi software package. To assess the potential fuel efficiency of the power plant, a multi-parameter characteristic of the YaMZ-238 internal combustion engine is used. The functional diagram of the power plant, the structural diagram of its control system without the use of a speed sensor are presented. The time diagrams for modeling work on an asymmetric load and its energy characteristics are given. It is shown that the developed power plant allows to provide an effective ICE speed control range of at least 2 with the limitation of the rated power of the converter at the level of 20 % of the rated power of the load. Thus, it creates the preconditions for significant fuel savings. The use of the power supply station in the proposed design makes it possible to reduce its cost by reducing the power of the converter and increase its energy efficiency by controlling the speed of ICE with a satisfactory accuracy of the output voltage under conditions of a significantly asymmetric load. The reliability of the results obtained in the study is confirmed by computer simulation.