Marcin Hołub

On the measurement of plasma power in atmospheric pressure DBD plasma reactors

Proposed paper deals with the subject of plasma power measurement in dielectric barrier discharge (DBD) reactors. Four approaches are compared including analytical, electrical, Lissajous figure and comparative methods. Discussion is led regarding measurement sensors, digital oscilloscope time base resolution and measurement capacitor technology. Lissajous curve approach gives results that are very comparable to definition based power calculation. Analytical approach, due to technical reasons, is inadequate, comparative approach gives slightly elevated values with respect to other methods. Measurement capacitor value should be of comparable capacitance to reactors overall capacitance, a pulsed technology capacitor should be used for measurements.

High Voltage Pulse Generator Using Transformer Parasitic Components for Pulsed Corona Discharge Generation

This paper proposes a new topology of a nanosecond, high voltage pulse generator devoted to pulsed corona discharge (PCD) reactor supply. The proposed topology is based on solid state, semiconductor switches and uses parasitic components of transformers. A prototype construction of the proposed generator loaded with a PCD reactor with 6.4-pF capacitance is able to generate high voltage pulses with maximum amplitude of 14 kV (using 5.4-kV supply and up to six modules of proposed topology, each equipped with a MOSFET transistor with 1-kV blocking capability) with voltage steepness of 730 V/ns. Obtained pulses are 65-ns long. The peak power delivered to the PCD reactor is > 0.3 MW while the energy consumed reaches 7 mJ/pulse. This paper also compares two different mechanical constructions of such generators and gives an overview of analytical and numerical voltage waveform analyzes.

Plasma-Based Depollution of Exhausts: Principles, State of the Art and Future Prospects

Nowadays non-thermal plasma technologies are state of the art for the generation of ozone as an important oxidant for water cleaning or bleaching, the incineration of waste gases or for the removal of dust from flue gases in electrostatic precipitators. Furthermore their possibilities of gas depollution are well known. Plasmas contain reactive species, in particular ions, radicals or other oxidizing compounds, which can decompose pollutant molecules, organic particulate matter or soot. Electron beam flue gas treatment is another plasma-based technology which has been successfully demonstrated on industrial scale coal fired power plants. This chapter aims a comprehensive description of plasma-based air remediation technologies. The possibilities of exhaust air pollution control by means of non-thermal plasmas generated by gas discharges and electron beams will be summarized. Therefore plasma as the 4th state of matter, its role in technology and the principle of plasma-based depollution of gases the will be described. After an overview on plasma-based depollution technologies the main important techniques, namely electron beam flue gas treatment, gas discharge generated plasmas including plasma-enhanced catalysis and injection methods will be described in separate sections. In these sections selected examples of commercially available or nearly commercialised processes for flue gas treatment or the removal of volatile organic compounds and deodorization will be described, too. Current trends and concepts will be discussed.

Experimental Results of a Combined DBD Reactor-Catalyst Assembly for a Direct Marine Diesel-Engine Exhaust Treatment

This paper gives an overview of a robust dielectric barrier discharge reactor-catalyst construction used in a bypass of a marine diesel-engine exhaust gas system. Electrode arrangement, housing, and electrode positioning systems are discussed allowing for high temperature and reasonable vibration operation. Preliminary test results are given considering the chemical reactions, particulate matter, and CO and HC reductions. An operative removal efficiency up to 99 percent is obtained (relative percentage units with respect to initial maximal concentrations). The basics of power supply construction and output waveforms are given.

Topology of a high voltage pulse generator using parasitic parameters of autotransformers for non-thermal plasma generation

In the article a converter topology for high voltage, nanosecond pulse generation is introduced. Proposed topology uses parasitic parameters of autotransformers as circuit components. Introduced converter was used to generate Pulsed Corona Discharge (PCD). Numerical analysis and results of laboratory measurements of the properties of proposed topology are presented. The voltage pulse was obtained with a duration less than 100ns, voltage amplitude of 15.3kV, with the power of 4kV. The peak power delivered to the reactor amounted to 260kW.

Single-period AC source with energy transfer control for dielectric barrier discharge plasma applications

Dielectric barrier discharge reactors are often operated using the pulse density modulation technique. A resonant converter topology is proposed with the ability of energy transfer control. Three different circuit topologies are proposed with energy recovery snubber design. System description, simulation results and test-stand waveforms are presented and discussed.

Averaged inverter loss estimation algorithm

Proposed paper presents a fast algorithm for determining static and switching losses of power electronic devices in three-phase DC/AC inverters for different semiconductor materials. This method uses table - form, stored characteristics of individual semiconductor devices, without a necessity of detailed, time resolved analysis of the commutation process. Using such algorithm accelerates total loss calculation, as a result electric machine control strategy can be developed allowing the improvement of the efficiency of the entire propulsion system.

Teaching modern power electronics-Computerized test stand design

A unified, computer controlled, modern system design for power electronics experimental laboratory is presented. Proposed test stand configuration simplifies the introductory part of the lab and maximizes the time that the students can use for experimental measurements and calculations. Hardware test stands (not only simulations) have a common pre‐configuration for all exercises so that students do not need to learn the system design and measurement configuration of every particular test stand. Clear measurement setup and momentary and average electrical parameter readings are done using a computer user interface. Hardware and software protection loops are foreseen so the number of errors of the hardware during testing is minimized, simple arrangement minimizes errors during test preparation.

Machine and inverter loss minimization of hybrid excited permanent magnet synchronous machines for electric vehicles

This paper discussed a control system for an HPMSM machine with a stator based field coil aiming at maximum efficiency of the inverter-machine system. A new procedure for efficiency-optimal inverter-machine propulsion system has been introduced. An iterative process for optimal current distribution is described with multidimensional tables of overall losses and efficiencies. Due to high-speed calculations, optimization algorithm can be implemented for various goal functions including classic PMSM drivetrains.

Practical verification of topology for a high voltage pulse converter for non-thermal plasma generation

This paper presents the topology of the high voltage, pulsed converter using transformer parasitic parameters. The converter uses solid-state switches and generates (in no load conditions) a voltage pulse with an amplitude of 20 kV with 5kV supply. The steepness of the voltage rise without load is 1.36 kV/ns and the pulse duration is less than 100ns.