Assessment of reliability of variable speed diesel asynchronous generator sets

Abstract

Calculation and subsequent analysis of reliability indicators is a mandatory stage of development and commissioning of technical devices. There has been carried out an assessment of reliability in relation to diesel generator sets operating in the mode of adjustable rotational speed at shared loads, which ensures their high energy efficiency. Unconditional compliance with the requirements for the quality of the generated energy (amplitude and frequency of the voltage in the ship's network) is realized in these generating devices by means of semiconductor converter technology. It is obvious that the increased technical complexity of variable-speed generator sets, which can be attributed to the class of machine-valve generator complexes, is associated with a certain decrease in their reliability indicators. There are presented structural schemes and indicated the composition of power equipment and controls for machine-valve generator complexes based on asynchronous generators with a short-circuited and phase rotor. The method of calculating the reliability indicators of these asynchronous diesel generator complexes is considered. The results of calculating the failure rate and operating time for failure are given, taking into account the load diagram of the power plant and the tachogram of the drive internal combustion engine, which corresponds to operation at energy-efficient rotational speeds at optimal (close to nominal) specific fuel consumption. The results of a comparative analysis of the operating time for failure allow us to determine the most reliable version of asynchronous generator electrical installation in operation.