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Volumen 5 (2014): Heft 1 (May 2014)

Volumen 4 (2013): Heft 1 (December 2013)

Volumen 3 (2013): Heft 1 (August 2013)

Volumen 2 (2013): Heft 1 (April 2013)

Volumen 1 (2012): Heft 1 (December 2012)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2255-9159
ISSN
2255-9140
Erstveröffentlichung
31 Jan 2013
Erscheinungsweise
2 Hefte pro Jahr
Sprachen
Englisch

Suche

Volumen 1 (2012): Heft 1 (December 2012)

Zeitschriftendaten
Format
Zeitschrift
eISSN
2255-9159
ISSN
2255-9140
Erstveröffentlichung
31 Jan 2013
Erscheinungsweise
2 Hefte pro Jahr
Sprachen
Englisch

Suche

7 Artikel
Uneingeschränkter Zugang

Invariant Method of Load Independent Pressure Control in Steam Boiler

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 5 - 10

Zusammenfassung

Abstract

The paper considers the possibility of steam production and supply process improvement by perfection of the steam boiler control system, applying invariance principle that makes possible preemptive compensation of the influence of steam expenditure as a disturbance on the control process quality and efficiency. For the development of invariant control system, the mathematical modeling and simulation in MATLAB - SIMULINK environment is made. The control unit is low pressure steam boiler with one input impact to control - the heat flow of burning gas mixture fuel, one measured output parameter of the process - the steam pressure, and the main disturbance as a load impact - the steam expenditure. The mathematical and virtual models and block-diagrams for transient process simulation is compiled, allowing to start practical design and investigation of steam boiler invariant control system with high operation stability under essentially fluctuating load. The simulation results prove that the optimal solution for the transient process improvement in steam boiler, taking in account fluctuating load, is invariant PID-DPC two loop control system with disturbance impact on steam pressure preemptive compensation. Under invariant control the steam pressure overshoots decreases substantially in comparison with the traditional PID-feedback control method.

Keywords

  • Time invariant systems
  • pressure control
  • closed loop systems
  • computer simulation
Uneingeschränkter Zugang

Simulation Study of Different Modulation Techniques for Three-Level Quasi-Z-Source Inverter

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 11 - 17

Zusammenfassung

Abstract

In this paper several modulation techniques for a three-level neutral-point-clamped quasi impedance source inverter are proposed and discussed. Mathematical descriptions with simulation results are presented for each modulation technique. Their advantages and disadvantages are shown and guidelines for further improvement are provided.

Keywords

  • Wind power generation
  • solar power generation
  • inverters
  • pulse width modulation
  • computer simulation
Uneingeschränkter Zugang

Implementation Possibilities of SMD Capacitors for High Power Applications

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 18 - 23

Zusammenfassung

Abstract

Focus is on implementation possibilities of surfacemount device (SMD) to be used in high power applications. SMD capacitors reduce the size and dimensions of a power circuit and increase the flexibility of placement of other components. Ceramic and electrolytic capacitors are compared by means of voltage ripple, volume, labour-intensity and impedance. A 1 kW experimental setup of a quasi-Z-Source inverter (qZSI) based converter was built to compare SMD capacitor performance in the quasi-Z-source (qZS) network.

Schlüsselwörter

  • Power conditioning
  • switched-mode power supply
  • power capacitors
  • surface-mount technology
Uneingeschränkter Zugang

New DC/DC Converter for Electrolyser Interfacing with Stand-Alone Renewable Energy System

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 24 - 29

Zusammenfassung

Abstract

This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The presented converter with an improved control algorithm for the full-bridge active rectifier features reduced energy circulation and switching losses. The performance can be improved under wide input voltage and load variations. The advantages of the converter were verified with a 1 kW converter prototype and the test results were in full agreement with the expected waveforms. The presented steadystate operation principle and mathematical analysis of the converter based on the simulation and experimental results can be used as design guidelines for component and parameter estimation in practical applications.

Keywords

  • Distributed power generation
  • energy storage
  • hydrogen storage
  • zero current switching
  • zero voltage switching
Uneingeschränkter Zugang

Autonomous Power Supply System for Light Sensor of Illumination Measurement Test Bench

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 30 - 35

Zusammenfassung

Abstract

Usually wireless devices require autonomous power supply. They are equipped with radio frequency transceiver modules with relatively high energy consumption especially in data transmission mode. This also means that autonomous power supply of wireless device requires relatively large energy storage. Rechargeable battery in this case is a good solution, but the charging process of a battery takes a long time. In this paper the use of supercapacitor as energy storage for autonomous power supply of wireless node is further elaborated on the example of light sensor for illumination measurement test bench.

Keywords

  • Lighting
  • optical variables measurement
  • wireless sensor networks
  • energy storage
  • supercapacitors
Uneingeschränkter Zugang

Load Compensation in Mechatronic System with Observer

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 36 - 39

Zusammenfassung

Abstract

Features of combined mechatronic systems creation with a rigid mechanics are observed in details. The usage of astatic regulators for the basic positioning loop is offered. Efficiency of regulators and observers adjustment on Bessel polynomial is shown for mechatronic positioning systems. Outcomes of synthesis of the load observer taking into account the drive dynamics and different forms of load in the system are resulted.

Keywords

  • Motor drives
  • observers
  • mechatronics
  • motion control
  • computer simulation
Uneingeschränkter Zugang

Estimation of Traction Drive Test Bench with Energy Storage System Operation in Regenerative Braking Mode

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 40 - 45

Zusammenfassung

Abstract

The paper presents configuration of the traction drive test bench with energy storage system, calculation of the scale factors, estimation of the energy storage system size and Matlab simulation results of the bench operation in a braking mode at different levels of the supercapacitor initial voltage.

Keywors

  • Motor drives
  • computer simulation
  • energy storage
  • supercapacitors
7 Artikel
Uneingeschränkter Zugang

Invariant Method of Load Independent Pressure Control in Steam Boiler

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 5 - 10

Zusammenfassung

Abstract

The paper considers the possibility of steam production and supply process improvement by perfection of the steam boiler control system, applying invariance principle that makes possible preemptive compensation of the influence of steam expenditure as a disturbance on the control process quality and efficiency. For the development of invariant control system, the mathematical modeling and simulation in MATLAB - SIMULINK environment is made. The control unit is low pressure steam boiler with one input impact to control - the heat flow of burning gas mixture fuel, one measured output parameter of the process - the steam pressure, and the main disturbance as a load impact - the steam expenditure. The mathematical and virtual models and block-diagrams for transient process simulation is compiled, allowing to start practical design and investigation of steam boiler invariant control system with high operation stability under essentially fluctuating load. The simulation results prove that the optimal solution for the transient process improvement in steam boiler, taking in account fluctuating load, is invariant PID-DPC two loop control system with disturbance impact on steam pressure preemptive compensation. Under invariant control the steam pressure overshoots decreases substantially in comparison with the traditional PID-feedback control method.

Keywords

  • Time invariant systems
  • pressure control
  • closed loop systems
  • computer simulation
Uneingeschränkter Zugang

Simulation Study of Different Modulation Techniques for Three-Level Quasi-Z-Source Inverter

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 11 - 17

Zusammenfassung

Abstract

In this paper several modulation techniques for a three-level neutral-point-clamped quasi impedance source inverter are proposed and discussed. Mathematical descriptions with simulation results are presented for each modulation technique. Their advantages and disadvantages are shown and guidelines for further improvement are provided.

Keywords

  • Wind power generation
  • solar power generation
  • inverters
  • pulse width modulation
  • computer simulation
Uneingeschränkter Zugang

Implementation Possibilities of SMD Capacitors for High Power Applications

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 18 - 23

Zusammenfassung

Abstract

Focus is on implementation possibilities of surfacemount device (SMD) to be used in high power applications. SMD capacitors reduce the size and dimensions of a power circuit and increase the flexibility of placement of other components. Ceramic and electrolytic capacitors are compared by means of voltage ripple, volume, labour-intensity and impedance. A 1 kW experimental setup of a quasi-Z-Source inverter (qZSI) based converter was built to compare SMD capacitor performance in the quasi-Z-source (qZS) network.

Schlüsselwörter

  • Power conditioning
  • switched-mode power supply
  • power capacitors
  • surface-mount technology
Uneingeschränkter Zugang

New DC/DC Converter for Electrolyser Interfacing with Stand-Alone Renewable Energy System

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 24 - 29

Zusammenfassung

Abstract

This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The presented converter with an improved control algorithm for the full-bridge active rectifier features reduced energy circulation and switching losses. The performance can be improved under wide input voltage and load variations. The advantages of the converter were verified with a 1 kW converter prototype and the test results were in full agreement with the expected waveforms. The presented steadystate operation principle and mathematical analysis of the converter based on the simulation and experimental results can be used as design guidelines for component and parameter estimation in practical applications.

Keywords

  • Distributed power generation
  • energy storage
  • hydrogen storage
  • zero current switching
  • zero voltage switching
Uneingeschränkter Zugang

Autonomous Power Supply System for Light Sensor of Illumination Measurement Test Bench

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 30 - 35

Zusammenfassung

Abstract

Usually wireless devices require autonomous power supply. They are equipped with radio frequency transceiver modules with relatively high energy consumption especially in data transmission mode. This also means that autonomous power supply of wireless device requires relatively large energy storage. Rechargeable battery in this case is a good solution, but the charging process of a battery takes a long time. In this paper the use of supercapacitor as energy storage for autonomous power supply of wireless node is further elaborated on the example of light sensor for illumination measurement test bench.

Keywords

  • Lighting
  • optical variables measurement
  • wireless sensor networks
  • energy storage
  • supercapacitors
Uneingeschränkter Zugang

Load Compensation in Mechatronic System with Observer

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 36 - 39

Zusammenfassung

Abstract

Features of combined mechatronic systems creation with a rigid mechanics are observed in details. The usage of astatic regulators for the basic positioning loop is offered. Efficiency of regulators and observers adjustment on Bessel polynomial is shown for mechatronic positioning systems. Outcomes of synthesis of the load observer taking into account the drive dynamics and different forms of load in the system are resulted.

Keywords

  • Motor drives
  • observers
  • mechatronics
  • motion control
  • computer simulation
Uneingeschränkter Zugang

Estimation of Traction Drive Test Bench with Energy Storage System Operation in Regenerative Braking Mode

Online veröffentlicht: 31 Jan 2013
Seitenbereich: 40 - 45

Zusammenfassung

Abstract

The paper presents configuration of the traction drive test bench with energy storage system, calculation of the scale factors, estimation of the energy storage system size and Matlab simulation results of the bench operation in a braking mode at different levels of the supercapacitor initial voltage.

Keywors

  • Motor drives
  • computer simulation
  • energy storage
  • supercapacitors

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