Electrical Schemes of Resonant Conversion of Reactive Power to Active

Abstract

Problem. Today, it is extremely important to solve the problems of efficient conversion of various types of energy (solar, wind, thermal, etc.) into electricity, which is a non-alternative factor in the comfort of the existence and development of all mankind. In this regard, the undoubted interest in practically accessible technical developments aimed at solving the above problems of the modern electric power industry should be highlighted. So, for example, the transformation of reactive power into active power, which can be used to perform work for various purposes, is of interest. Goal. The purpose of this work is to propose and theoretically substantiate the effectiveness of possible schemes for a resonant reactive power to active power converter, combined by the presence of two inductively coupled active-reactive circuits and different ways of creating resonant conditions in each of them. Methodology. The calculated ratios for the theoretical substantiation of the effectiveness of the considered converter circuits are based on physically clear phenomenological provisions and a rigorous mathematical approach using the apparatus of the theory of electrical circuits. Results. For a circuit where resonance excitation is carried out by an appropriate choice of its parameters, the conditions are determined, the fulfillment of which minimizes the influence of the proposed circuit on the processes in the reactive power source at the maximum current in the converter load. The real parameters of the circuit are calculated, where, with the proper choice of its parameters, it is possible to carry out a real conversion of the input power (conversion coefficient ~ 1.0) with a minimal effect on the current in the reactive power source (decrease to ~ 8,5%). For a circuit with an additional source of harmonic voltage, it is shown that with an appropriate setting of a third-party source, it is possible to completely eliminate the negative effect of electromagnetic processes in the converter circuit on the output voltage and current of the reactive power source. Originality. The scientific novelty of this work lies in the proposal and analysis of possible schemes of the resonant converter of reactive power into active power, combined by the presence of two inductively coupled active-reactive circuits and different ways of creating resonant conditions in each of them. Practical value. The theory and numerical assessments of the characteristics of the processes occurring in the proposed circuits of the resonant reactive power converter are important for further experimental studies, as well as for formulating recommendations for the manufacture of various options for operating devices for the appropriate purpose.