Control method for autonomous voltage inverters of ship power plants

Abstract

The article proves that improving the quality characteristics of energy converters with a DC link with multiple switching and pulse-width regulation is an urgent task. In this case, a contradiction arises between the requirement of minimizing losses in asynchronous motors and minimizing losses in frequency converters, which requires, on the one hand, an increase, and, on the other, a decrease in the carrier frequency. Achieving the necessary technical and economic indicators of secondary energy converters, as converters with a DC link, requires the use of multiple switching with various modulation methods in combination with pulse-width regulation, as well as step-wise principles of energy conversion. Therefore, improving the quality characteristics of energy converters with a DC link with multiple switching and pulse-width regulation is an urgent task. The purpose of the study is to develop a method for controlling autonomous voltage inverters of ship electrical power plants. The study shows that the development of control methods for AVI in AC-DC systems is associated with the use of various types of PWM, which require only modification of control algorithms focused on direct microprocessor control and reducing the required switching frequency. Direct microprocessor control of electric drives opens up significant prospects for the development of multiphase power systems, since it allows organizing connected control over a large number of phases, limited only by the resources and number of control channels of a specific microprocessor board. Taking into account the splitting of power by phases, the possibility of using high-speed switches appears, which further expands the possibilities of applying complex control laws in transient operating modes of the electric drive of ship electrical power plants