Chopyk V. Matrix converters with extended control range of the input reactive current for active compensation of the power components.

The object of research: The conversion processes of electric energy parameters using matrix converters. The purpose of research: The development of the theory of matrix converters by creating new control methods and improvement of existing ones which provide the extension of control range of the matrix converter input reactive current for improving the effectiveness of active compensation of the unwanted power components. Methods of research: Instantaneous power theory, methods of coordinate transformations, the space vector method, the elements of the matrix calculus and vector algebra, harmonic analysis and voltages and currents waveforms synthesis, electric circuits theory, the theory of differential equations, physical modeling and mathematical simulation with the use of MathCAD and MATLAB. Theoretical and practical results and innovations: A new method of the matrix converter control using the singular value decomposition to extend the range of the input reactive current control during unbalance of the power supply voltages, which is to use the modified Park transformation, which takes into account the degree of unbalance; dependences of the quality parameters of the output voltage, input current and ripples of the electromagnetic torque of motor, which fed from matrix converter, from the nature of the switches control functions of the converter have been found by which the continuity and increase of the degree of smoothness of these functions provide the corresponding increase of power quality parameters and reduce torque ripples; new method of proportional-vector control of the power converter in the shunt active filter has been developed, which consists in forming a voltage vector at the limiting reactor of the filter unidirectionally with the error vector between estimated and actual compensation currents; the set of constraints imposed on the conditions of the effective functioning of the shunt active filter and are to select a range of operating voltages and parameters of the reactors to provide the necessary dynamics of adjustment and specified quality of consumed current has been defined; new topology of the shunt active filter, which consists in the application as a power converter of the autonomous system compensator "matrix converter - three-phase capacitive storage element" has been proposed; principles for providing the maximum possible range of the input reactive current control of matrix converter has been developed, consisting in the application of new ratios that include the coefficients of direct representation of the output parameters of the converter to determine the duty-cycle space vectors; the new method of calculating of compensation currents of shunt active filter with an independent determination of undesirable components without intermediate coordinate transformations for three-phase three-wire load has been developed. The subject and degree of implementation: Application in the construction of control systems converters and based on them the compensators that have passed experimental verification and tests at the enterprises "Knauf Gips Kyiv" and "KEP", which is confirmed by appropriate acts of the implementation and application. Effectiveness of implementation: Increase of efficiency of active compensation of unwanted power components. The field of use: enterprises of electrical engineering profile.