Michal Gwozdz

Poznań University of Technology · Institute of Electrical Engineering and Electronics

The article presents an algorithm and optimization software designed for the optimal configuration of a tuned inductive choke. The optimization software consists of two main parts: an optimization procedure and a mathematical model for the designed electromagnetic devices. A lumped-parameters model of a tuned inductive choke was developed, with the...

This work is devoted to possible implementation of tunable magnetic devices in electrical systems with adaptive properties. The basic idea, underlying operation of the presented magnetic device, depends on interaction of two (or more) magnetic fluxes in a quasi-linear range of ferromagnetic core characteristics. This is a new approach to the design...

The work focuses on the possibility of application of tunable magnetic devices in electrical power systems with adaptive features. The idea underlying this type of operation, which depends on interaction with magnetic fluxes in a quassi-linear range of magnetic core characteristics, is a new approach to the design of magnetic elements. The suitable...

This work represents a continuation of the research cycle on magnetic devices with adjustable parameter values. The work focuses on the possibility of using tunable magnetic devices in electrical power systems with adaptive features. The idea underlying this type of operation, which depends on interaction with magnetic fluxes, is a new approach to...

This work represents a continuation of the research cycle on magnetic devices with adjustable parameter values. The work focuses on the possibility of using tunable magnetic devices in electrical power systems with adaptive features. The idea underlying this type of operation, which depends on interaction with magnetic fluxes, is a new approach to...

This work focuses on the possibility of using a tuned inductor in electric power systems with adaptive features. The presented idea of inductor operation, using an interaction of the magnetic fluxes, is a new approach to designing such devices. Examples of power adaptive systems are devices for improving the quality of electricity. Therefore, vario...

This work focuses on the use of a one-phase direct current (DC) power supply equipped with a shunt active filter feature, which enabled the possibility of compensation (minimisation) of reactive and distortion power, generated by a group of loads, that was connected to the same power grid node as the power supply. A tuned inductor, which was includ...

In this work, an idea of a wideband, precision, power electronics programmable voltage source (PVS) is presented. One of the basic elements of the converter, the control section, contains a continuous-time sigma-delta modulator (SDM) with a pair of interconnected complementary comparators, which represents a new approach. In this case, the SDM uses...

Calculating the values of the parameters of distorted periodic signals in real-time is important for the control of many processes. In particular, this information is necessary for the proper operation of power electronics devices that cooperate with the power grid. In such cases, it is necessary to determine the phase, frequency, and amplitude of...

In this work, the concept of an energy conversion system for wind turbines based on the modified permanent magnet synchronous generator (PMSG) is presented. In the generator, a pair of three-phase windings is used, one of which is connected in a “star” and the second in a “delta” configuration. At the outputs of both windings, two six-pulse uncontr...

In the article, the simulation model of a one-phase full bridge diode rectifier with a current modulator in the input circuit is described. The proposed solution is characterized by the consumption of a sinusoidal current from a power grid, compatible in phase with the fundamental harmonic of voltage. The power circuit, as well as controlling parts...

Purpose The purpose of this paper is to present the electromagnetic phenomena in permanent magnet synchronous generator (PMSG) suited for wind turbines with uniquely designed system of two windings. The machine’s windings allow for application of a reliable and low-cost power electronic converter. Design/methodology/approach The 2D field-circuit...

This chapter presents a concept for a shunt active power filter (APF) that is able to more accurately map its input current in a reference signal, when compared to a typical filter solution. This can be achieved by interconnecting two separate converters, such that one of the converters corrects a total output current towards a reference signal. Th...

The chapter presents a conception of a power electronics inverter based on a modified sigma-delta modulator (SDM) being used in the inverter’s control block. The proposed modulator includes a comparator with dynamic hysteresis instead of a latched comparator, which is typically used in single-bit SDMs. Thanks to this feature, the resolution of the...

In the paper, the concept of a permanent magnet synchronous generator (PMSG) with uniquely designed stator windings for wind turbines is presented. Two 3-phase windings in the stator are used, one of which is connected in the star, while the other in the delta configuration. Six-pulse rectifiers, mutually coupled by the pulse transformer, whose pri...

In the paper the 3-phase power diode rectifier system with quasi-sinusoidal input (power grid) current is presented. In order to benefit from it, the current modulation in the DC circuit of a rectifier is used. The essential part of the current modulator is the wide-band power electronics controlled current source based on a multi-channel converter...

In this paper a single phase grid-connected photovoltaic converter with maximum power point tracking algorithm is presented. This system is characterized by high efficiency and good output quality parameters of electrical energy. The implemented output inverter operates in current tracking controller mode. The output current (current of grid) is al...

The paper presents a concept of a shunt active power filter (APF), which is able more precise mapping of its input (power grid) current in a reference signal, compared to a typical filter solution. It can be achieved by means of such interconnection of two separate converters that one of them corrects a total output current towards a reference sign...

In contrast to the generally used methods, software only solution of the controller for balancing of current distribution in multi-channel (interleaved) converters is proposed in the work. No additional measuring devices, e.g. current transducers, are necessary for proper operation of the converter. The controller constitutes part of a control syst...

The subject discussed in the paper is the special purpose power electronics converter that fundamental task is generating an output current being precisely mapped in a reference input signal. The estimated generator output power is equal to 1 kW. The main expected application area of this one is a high power ATE (Automated Test Equipment). The pape...

A subject discussed in the article is the special purpose power electronics converter that fundamental task is generate the output current being precisely matched in the reference signal. The study presents the first stage of work on the layout of this type of converter. The main expected application area of the generator is ATE (Automated Test Equ...

The paper presents selected aspects of the work of a LC filter implemented in a power electronics controlled voltage source, the purpose of which is to minimize PWM components in a source output voltage. A small value of a filter damping factor in conjunction with a control signal about high dynamics of change can cause that in a source output volt...

The paper presents a conception of power electronics voltage controlled current source (VCCS) which is able much more precise mapping of its an output current in a reference signal, compared to a typical converter solution. It can be achieved by means of such interconnection of two separate converters that one of them corrects a total output curren...

The subject of the paper is the active power shunt filter based on a multi-channel converter topology. Thanks to the property of the filter its frequency response is extended. In the result the filter input current (power grid current) is better mapped in the reference signal, compared to a conventional filter solution. Also, the amplitudes of puls...

Purpose The aim of the research was to find a structure of the power electronics controlled current source with extended pass band, which would better match a source output current within an input (reference) signal. Also, pulse modulation components in output current of current source should be minimized. Design/methodology/approach The power ele...

Subject of the article is a power electronics active shunt filter with an extended pass-band. Thanks to this solution an active filter better match a filter input current within a reference signal. Also, pulse modulation components in a filter input current are minimized. A power electronics controlled current source, being essential part of a filt...

Enlarged technical requirements are connected with precise of control, speed of reaction as well as resistance onto disturbances from receiver or power supply of power electronics inverters. It causes from demand grows up onto power electronic arrangements small and large power, linear in view of input and output, acting in real time. A kind of pow...

In the paper the diode rectifier with current modulation in DC output circuit is presented. The power circuit of this converter and structure of control system of power electronics current modulator are described. With aid of such solution, power grid current of presented rectifier is almost sinusoidal. Different structures of current regulator – p...

Technical requirements are connected with precise of control, speed of reaction as well as resistance onto disturbances from receiver or power supply of power electronics inverters. It causes, from demand grows up onto power electronic arrangements small and large power, linear in view of input and output, acting in real time. Proposed structures o...

Present tendencies of evaluation current distortion compensation methods aim to work out such compensator (parallel active filter) which would be able to realize real time compensation of current distortions. Unfortunately dynamics of every real power electronics current source, being essential part of such filter, is limited. Proposed idea of incr...

In this paper the structure of control system of power electronics current modulator is presented. This converter is placed in output circuit of 3-phase diode rectifier. With aid of such solution, power grid current of decribed rectifier is almost sinusoidal. Different structures of current regulator - part of control circuit - are considered. Chos...

Present tendencies of evaluation current distortion compensation methods aim to work out such compensator (serial or parallel active filter) which would be able to realize real time compensation of current distortions. The assumed aim of parallel active filter work is dynamic compensation of differential current which is the difference between load...

Enlarged technical requirements are connected with precise of control, speed of reaction as well as resistance onto disturbances from receiver or power supply of power electronics inverters. Thus it is necessary considerable elevation of quality of voltage and current signals on energetic output of arrangements, in relation to references signals, w...

Dynamic changes of parameters of energy sources and receivers are reasons that decrease exactitude of output signals towards reference signals. To improve these parameters utilization of advanced solutions of power electronics inverters is necessary. Ones of them are wide band controlled voltage and cunent sources. The basic problem with developing...

In the paper structure of control circuit of power electronics current modulator implemented within DC circuits of two 6-pulse diode rectifiers is presented. This solution is particularly attractive for large power rectifiers because obtains close to sinusoidal power grid current while modulator power is relatively low. Different structures of cont...

Present tendencies of evaluation current distortion compensation methods aim to work out such compensator (serial or parallel active filter), which would be able to realize real time compensation. The assumed aim of parallel active filter work is dynamic compensation of differential current which is the difference between load current and reference...

The paper considers generator of spatial magnetic field for medicine purposes. One of essential blocks there is precision three-channel power electronics current source, powering set of space oriented induction coils (electromagnets) being sources of magnetic field. The control module utilizes DSP based microcomputer for power electronics applicati...

In the paper one of control methods of electrical systems is presented. In this particular case the electrical system has been precision wide-band power electronics current source. This source has been fundamental part of flexible Reference Current Generator for testing of energy meters and other laboratory purposes. The control module of Generator...

The paper presents a system for measurement of value and distribution of spatial magnetostatic field, which has a form of a matrix of fields transducers. The control system of measuring system converts output signals of transducers and provides communication by the serial port with a microcontroller board type ADMC401. From the UART port data are s...

The paper considers Generator of the Spatial Magnetic Field for medicine purposes. One of essential blocks there is three-channel power electronics current source, powering set of space oriented induction coils (electromagnets) ¿ sources of magnetic field. The control module utilizes DSP based microcomputer for power electronics applications. The...

The paper presents some damaging phenomena within circuit consisting of MSI frequency converter and AC motor. Next, chosen investigation results of DSP controlled adjustable speed drive utilizing power electronics quasi -linear voltage source are described. Finally, industry prototype of such 3 -phase voltage source (SINVERTER) is described too.

In the article the new development tool of digital systems with Analog Devices Blackfin processors is presented. The chosen proprieties and mechanisms of working are described, as well as example of analyzer of current network created with aid of the tool.

In the paper analysis of current distortion compensation effectiveness with aid of 1-phase power electronic shunt compensator has taken place. The analysis has been done with reference to most characteristic of non-linear receivers. Next, on the base of signal model, stability analysis has taken place. Selected investigation results of simulation m...

Presents a system capable of achieving optimal compensation (in real time) by elimination of differential current and employing power electronic controlled current sources. The functional block diagram and a description of the working principle are included. Simulation tests were carried out on current source and active compensation system. The res...

In the paper the idea of a compensator of differential current with a parametric filter is described. The task of the compensator is dynamic compensation of current, that is the difference of load current and active current delivered by an optimal energy source (generator) on account of transferred real power and shape. The block diagram of a compe...