Zapalskyi V. Automation of processes of improvement power quality energy in autonomous electroenergy power system with semiconductor rectifiers.

The dissertation deals with the problems automation of raise power quality energy in autonomous power plant systems with semiconductor rectifiers (SR) of electrical power energy. The desirable result is reached by application power filter devices (PFD) in view of features of their operation in an electric power generating system of marine structure with powerful SR. The ways of improvement of ways of a filtration with lowering of coefficient non - sinusoidal of mains power voltage. The methods of an experimental estimation of parameters of power quality electric are perfected, the analytical associations of the analysis, synthesis and modeling researching adaptive control system with fuzzy - logic regulator. Adequacy of theoretical results achieved in dissertation is confirmed by the results of numerical, physical modeling and realization of real model of power structure PFD. In the dissertation work on the basis of the theoretical and experimental results obtained, when they are systematized, the actual scientific and applied problem of increasing the power quality indicators in the autonomous electric power system of the marine structure is solved. The main scientific results include the following. The models on the basis of which the electromagnetic processes and electric power quality indicators were studied in the ship electric power system (EPS) of modern marine structures with SR in order to formalize the tasks of creating controllable PFD for automation of improving the quality of electric power. The method of experimental identification and control of power quality indicators was proposed and improved with the aim of increasing the accuracy of reactive power compensation by taking into account commutation high-frequency oscillations and mutual influence of synchronous generators, SR and PFD on the quality of electromagnetic processes in autonomous EPS. The principle of constructing a power circuit is developed by an advanced controlled PCF of hybrid structure with pulse-width control of the reactor compensator for providing simultaneous compensation of reactive power at the fundamental harmonic and the necessary reduction of the higher harmonics of the current and voltage consumed. The proposed principle due to the continuity, accuracy and speed of regulation ensures full compensation of reactive power (with an error of 0.1%). The proposed principles of the structural-algorithmic implementation of the control system of the improved CPFD and the appropriate two-circuit resolution algorithm along with the compensation of reactive power achieve a reduction in the higher harmonics and the voltage non-sinusoidal coefficient up to 6%. The performed comparative analysis of the efficiency of various regulators in the system of electric power quality indicators management in conditions of uncertainty of disturbing effects has proved that the dynamic properties of the proposed SR are significantly improved when using the regulator PhL. This allows you to adjust the PhL controller depending on the magnitude of the error E (t). In addition, the SR provides an expansion of the frequency range of regulation in 5 - 8 times, an increase in the speed by using the microcontroller to 20%, and improving the dynamic characteristics of the device. The computer models of a system with an improved CPFD are designed and tested to provide the necessary power quality indicators regulated by the requirements of the Marine Register and classification societies. In particular, full compensation of reactive power is provided and minimization of the voltage non-sinusoidal coefficient is specified. The analysis of the results of a model study of the system of automated quality assurance of electric power has made it possible to experimentally study the full-scale sample of the power unit of CPFD. The tests confirmed the high agreement between the results of analytical, model and experimental studies. The decrease in Ku from 15.96% to 9.38% was achieved and it was confirmed that the payback of one complex of controlled filtration capacity to 400 kW is 1.2 - 2 years, depending on the operation modes of the marine structure. Area of application - exploitation autonomous power energy system, shipbuilding, shiprepear.