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The problem of control system design is discussed for a high frequency DC-DC converter which is based on the push-pull circuit with autotransformer. The proposed converter may be used as a battery discharge unit in power supply system of satellites. The mathematical model of the converter is described. The proportional-integral (PI) current controller and PI voltage controller are designed based on...
The paper presents a structure of a magnetic gearbox. It is shown that a simulation model of a magnetic gearbox can be reduced to the two-mass system. Based on the representation of force impact of a magnetic field between two halfcouplings by inertialess flexible coupling, the structural model of the magnetic gearbox is developed.
The paper describes a mathematical model of high frequency DC-DC converter based on the push-pull circuit with autotransformer. Similar schemes of converters are widely used as battery discharge units in power supply system of satellites due to high performance characteristics and reliability. The paper provides a brief overview of the characteristics of the widely used solutions and defines the issue...
This paper is devoted to analysis of the state-of-the-art in electronic component base of class Space. The review covers integrated circuits for designing digital semiconductor converter control system with a high-frequency PWM control. For this purpose modern chip digital controllers, digital signal processors, field programmable gate arrays, PWM controllers, base matrix crystals (BMC) and ASIC were...
This paper presents a brief review of “soft” switching power converters. It includes resonant, quasi-resonant, multi-resonant converters with different switching pattern. It also takes in scope converters with active current shape fixation. Some words are provided to disclose SiC and GaN transistors propositions in application considered.
In this paper, a solution of problem is suggested that devoted to a synchronization of semiconductor converter control system as part of a power supply system based on a synchronous generator with permanent-magnet excitation operated at variable speed of shaft rotation. The proposed solution ensures the entire functionality of the standard control system algorithms in the presence of various disturbing...
In this paper a new approach of ground fault capacitive current compensation in ungrounded distribution networks is proposed. According to proposed method in parallel with network phases a static semiconductor converter is connected. In the ground fault mode the converter must generate the current of zero sequence in opposition with capacitive short circuit current. In this paper the electromagnetic...
This paper considers spectral mathematical model of the AC-AC converter scheme realized by switching functions method. Simulation results in steady state operation mode are presented in this paper.
The paper presents the results of laboratory tests of the prototype of electric engine starting system. The electric starter mode has been tested on a three-stage synchronous generator. The purposes of the tests were to develop control algorithms and to verify prototype's performance while feeding three-stage synchronous generator. The preliminary tests of the power unit of prototype have also been...
Realization of multi-usage of on-board devices is one of the criteria for the effective usage of aircraft on-board equipment. As part of this criterion, it seems appropriate to integrate the starter and generator of the auxiliary power unit in a single unit [7]. The article presents the laboratory test results of the electric engine starting system prototype. An electric starter mode has been realized...
In this paper basic synthesis methods of digital Hilbert filters are considered. The optimal method in respect to control systems of static converters of electrical energy was chosen. The results of filter's simulation with figure of signals at the its input and output were represented. This filter can be used in algorithm of positive, negative and zero sequence three-phase electrical quantities calculation.
In this paper extraction algorithm of symmetrical components for controlling static converters of electric energy using the digital Hilbert filter are considered. An implementing method of this algorithm for control system of static converters of electric energy is offered. The simulation of the three-phase voltage inverter is performed.
This paper considers scheme of primary power generation system with low output voltage. Total power of this system is 3.5 kW. Paper also presents configuration and experimental results for one channel of power generation system.
This paper, considers a mathematical model the starter system for gas turbine engines. Model of the investigated three-stage synchronous generator has been built in the dq-coordinates. The obtained model allows one to configure the machine parameters in a wide range, as well as receive information about currents and voltages major electrical components of the machine. Mathematical modeling shown efficiency...
This paper presents the method of increasing the input power factor and output voltage fundamental harmonic of the cycloconverter based on bridge circuit and proposed to be used in power generation system of aircraft. The increase of the output voltage fundamental harmonic is achieved by introducing the combined control law. The combined control signal assumes the artificial introduction of components...
In this article the direct method of synthesis of regulators is offered on the example of the current loop, as internal loop of the double-loop subordinate control system for a buck dc-dc converter.
The article describes a method to start the three-stage motor with damping winding. This method is described for use in the auxiliary power unit (APU). The investigation consists of a main synchronous generator with damping winding exciter - synchronous generator with excitation winding and subexciter representing a three-phase permanent-magnet synchronous generator, designed to provide self-excitation...
In this paper construction of a system with the stabilization of the current value of the variable voltage and frequency based on AC-AC regulator with voltage boost with unity power factor function with PWM control is proposed. A mathematical model of the system is constructed. The investigation results concerning the properties of the offered AC-AC regulators and their possible applications for stabilization...
This paper considers spectral mathematical model of the AC-AC converter scheme realized by switching functions method. Simulation results in steady state operation mode are presented.
A calculation method for symmetrical components and zero sequence is considered. Zero sequence is calculated by means of digital phase-rotatory filter based on Gilbert transform. The regulator control algorithm of symmetrical current components is proposed. The results of circuit simulation in different setpoints for symmetrical components were obtained.
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