Dmitry A. Shtein

Analysis of electromagnetic processes in the three phase multizone current source inverter

In this paper detailed analysis of the electromagnetic processes in the new multizone current source inverter was carried out, resulting in the analytical ratios for the qualitative evaluation of the load currents, depending on the relative resistance of the load, as well as an external characteristics of converter by using the method of differential equations algebraization was obtained [1]. The results of this analysis are summarized for any number of converter zones working on a capacitive divider. In addition, the results of analysis are confirmed by computer simulation of three-phase multizone current source inverter by PowerSIM software.

Analysis of coupled inductors in AC variable frequency generation system

This paper proposes an approach for minimizing weight of variable-frequency constant-amplitude power generation system. The system consists of a permanent magnet generator and semiconductor converters with coupled inductors that provide aircraft power supply. The main approach to maintain an amplitude of generated voltages is using of reactive power injection into the stator as a means of regulating the stator voltage. The main results of calculations are presented.

Z-source inverter with neutral point

This paper proposes a novel inverter for four-wire systems. The number of used transistors is reduced in a Z-source inverter with neutral point as compared with known schemes of Z-source inverter for four-wire systems. It increases reliability and efficiency. The scheme operation is verified by simulation.

The universal control system for semiconductor converters with PWM

This paper considers an example of a control system for semiconductor converters with pulse-width modulation (PWM). Also the structure of the control system and an example of the proposed system implementation for a DC/DC converter are outlined.

Transistor converters as a part of four-wire autonomous power generation system

The growth of power consumption of autonomous objects requires creation of new powerful and energy-efficient converters. This paper describes a new version of the autonomous power generation system alternating current and constant frequency with better energy-efficiency based on three-level converters. The results of computer simulation in the software package POWERSIM 9.0 are presented in the work. Two decisions to the problem of output voltage imbalance with unbalanced loads are proposed and compared in the paper.

Comparison of the inverter schemes in an autonomous power supply system

Voltage inverter is one of the basic components of an autonomous AC power supply systems. This article is a comparative analysis of two-level and three-level voltage source inverter schemes. The analysis includes calculation of the efficiency and estimating the weight and size of converters compared. Simulation models for both inverters were developed in the software package POWERSIM 9.0.

Comparison of Dual Z-Source inverter and PWM voltage source inverter for aircraft power generation system

Dual Z-Source inverter is considered. Simulation results of the aircraft variable-speed/ constant frequency power generation system with dual Z-source inverter are presented. The system is compared to that with the Pulse-Width Modulated (PWM) voltage source inverter.

Simulation of the multiple port DC-DC converter

DC-DC converters are used as secondary power sources. There are many different topologies of such converters, each of which has its own advantages and disadvantages. It is also possible to combine them in order to ensure a more reliable power supply. This paper presents the new scheme of multiple port DC-DC converter and its simulation results in three operating modes.

Comparative analysis of multilevel converter schemes for power supply systems of autonomous objects

This paper presents a comparative analysis of the energy characteristics of two topologies multilevel semiconductor converters: a three-level voltage source inverter and two-zone current source inverter. Computer simulation was used to obtain energy and control characteristics of studied converters. Harmonic distortion was used as the primary evaluation criteria to compare the quality of output voltage, which is formed by these two schemes. The peak values of voltages and currents that affect the semiconductor devices are analyzed.

Uninterruptible power system with parallel operation of AC/DC and DC/DC converters

Growth of a number of different electrical equipment on board of autonomous objects requires the creation of new high reliability power supply systems operating even in an emergency case. This paper presents a new version of implementation of the uninterruptible power system (UPS) based on parallel operation of AC/DC and DC/DC converters. Such structure allows to supply the system from two independent power sources (source of alternating current 400Hz, 115V and source of direct current 27 V). Therefore, the system can operate even in case of loss of one of the sources. UPS operates simultaneously from both onboard power sources in normal mode and distributes the load power equally between them.