Y. Majanne - Academia.edu (original) (raw)

Papers by Y. Majanne

International Journal of Robust and Nonlinear Control, 2012

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific ... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

IFAC Proceedings Volumes, 1993

A scheme for a diagnostic autonomous control strategy of a power plant feed water process is disc... more A scheme for a diagnostic autonomous control strategy of a power plant feed water process is discussed. The control system is based on Model Predictive Control strategy. MPC, applying diagnostic information to optimise the control result and the availability of the process. In this paper condition monitoring and diagnostics are carried out by diagnostic algorithms based on models describing the general properties and characteristics of monitored components as a function of operating points and time. However, information from any kind of diagnosis system can be applied. The diagnostic information is used to update the constraints and control increment weights in the cost function under which the MPC system calculates optimal control signals. The proposed system is able to change the dynamics and the structure of control system automatically during the operation of the process, if any malfunctions have been detected

IFAC-PapersOnLine, 2019

Micro-size hydro power plants are commonly used at remote areas to supply islanded AC micro-grids... more Micro-size hydro power plants are commonly used at remote areas to supply islanded AC micro-grids. A typical way to control grid frequency is to manipulate active power dissipated in ballast loads by AC/AC converters. However, conventional asymmetrically switched thyristor controlled converters consume reactive power degrading the power factor at the generator output and transmission efficiency. In this paper the operation of a symmetric angle switched, bridged three-phase rectifier and three single-phase rectifiers connected in series with ballast load, are studied to improve the power factor of the system. The objective is to evaluate the characteristics of these two configurations to improve the power factor by reactive power compensation in the frequency control of an islanded micro hydropower system.

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Special Issue: Fault Tolerant Control of Power Grids Peter Odgaard, Christophe Aubrun, Yrjo Majanne

A scheme for a diagnostic autonomous control strategy of a power plant feed water process is disc... more A scheme for a diagnostic autonomous control strategy of a power plant feed water process is discussed. The control system is based on Model predictive Control strategy. MPC, applying diagnostic information to optimise the control result and the availability of the process. In this paper condition monitoring and diagnostics are carried out by diagnostic algorithms based on models describing the general properties and characteristics of monitored components as a function of operating points and time. However, information from any kind of diagnosis system can be applied. The diagnostic information is used to update the constraints and control increment weights in the cost function under which the MPC system calculates optimal control signals. The proposed system is able to change the dynamics and the structure of control system automatically during the operation of the process, if any malfunctions have been detected.

On-line diagnosis system for power plant components and subprocesses is presented. The system is ... more On-line diagnosis system for power plant components and subprocesses is presented. The system is based on fault selective diagnosis algorithms applied to on-line process measurements. The algorithms calculate specific characteristics from monitored components in order to determine their operating state. User interface, system updating and system configuration are implemented on an expert system. The procedural algorithm level and the expert system level are separated into different computers. Different type of knowledge are divided into hierarchical levels in order to keep the system consistent, easily maintainable and fast enough for real time operation.

IFAC-PapersOnLine

Abstract Since 2013, the biggest Caribbean island, Cuba, has been undertaking an energy matrix ch... more Abstract Since 2013, the biggest Caribbean island, Cuba, has been undertaking an energy matrix change. There is a strong political intention to replace fossil fuels by renewable energy and improve efficiency and security of the national energy system. By 2030, 24% of electric power shall be produced from renewable sources. Transition from centralized fossil fuel fired power system towards distributed renewable generation based system requires changes to conventional energy planning and system design procedures as well as physical structures of the national energy system. This paper introduces three analysis axis: Scenario building for future supply-demand balance, scenario for a 100% renewable energy system for Cuba, and a roadmap from existing power system to the system with high share of distributed renewable generation. This work is a part of European Union funded Erasmus+ project “Capacity Building for Renewable Energy Planning in Cuban Higher Education Institutions”, CRECE.

IFAC Proceedings Volumes

Abstract The purpose of this paper is to present some possibilities of fault detection of a filte... more Abstract The purpose of this paper is to present some possibilities of fault detection of a filter. The study is based on process measurements in a chemical plant. By using on-line measurements the characteristic features of normal and damaged filter are studied and the degradation model of the filter is presented. The possibilities to on-line fault diagnosis are introduced. The reasons for filter damages and how these can be avoided are also introduced. It is also shown that with some changes in the construction of the filter its operational life time can be increased. Some preliminary results of off-line fault diagnosis is presented.

IEEE Control Systems Magazine, 1987

ABSTRACT Large variations in moisture content and heat value of fuels (peat, bark, coal) can caus... more ABSTRACT Large variations in moisture content and heat value of fuels (peat, bark, coal) can cause stability problems in combustion. Some computer-based methods to improve the measurement and control of solid fuel boilers have been developed. A microprocessor-based four-beam infrared moisture measurement system has been developed, which has advantages compared with ordinary two-beam sensors. The paper also presents a digital measuring station for estimating the fuel power of the plant. Furthermore, flame monitors might give a false "flame-off" indication even if the fuel is still burning. The system developed herein estimates the changes of the combustion process by comparing the amount of flue gases generated in the process with the fuel and air feed. By adding this information to the signals obtained from the flame monitoring system, the existence of the flame can be verified. Finally, load level and combustion conditions in industrial power plants vary continuously, and when solid fuels are used, the optimal excess air in the flue gas does not stay constant. We have developed and tested a method for minimizing the losses of the boiler.

Proceedings of IEEE Systems Man and Cybernetics Conference - SMC, 1993

ABSTRACT It has proved to be difficult to apply model based diagnosis methods to process industry... more ABSTRACT It has proved to be difficult to apply model based diagnosis methods to process industry because of high development and maintenance efforts and real time requirements (Al applications). Hierarchical structure is one way to make model based systems easier to apply by decomposing the system into small and simple submodels. This paper presents the research work made about the hierarchical fault systems in the Control Engineering Laboratory of Tampere University of Technology (TUT)

Control Science and Technology for Development, 1986

International Journal of Robust and Nonlinear Control, 2014

ABSTRACT This special issue contains article on fault detection and isolation and fault tolerant ... more ABSTRACT This special issue contains article on fault detection and isolation and fault tolerant control methods applied to different aspects of modern power grids, both for detection, isolation and accommodating faults in the power grid, and for detection, isolation and accommodation of faults in power generating units. Copyright © 2014 John Wiley & Sons, Ltd.

Control Engineering Practice, 1995

... 1993, Le Touquet, France. Majanne, Y., Ruokonen, T. and Kurki, M. (1991): Hierarchical Online... more ... 1993, Le Touquet, France. Majanne, Y., Ruokonen, T. and Kurki, M. (1991): Hierarchical Online Diagnosis System for Power Plants. IFAC IMACS Symposium on Fault Detection, Supervision and Safety for Technical Processes Safeprocess'91. BadenBaden, Germany. Patton, R ...

International Journal of Robust and Nonlinear Control, 2012

HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific ... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et a ̀ la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

IFAC Proceedings Volumes, 1993

A scheme for a diagnostic autonomous control strategy of a power plant feed water process is disc... more A scheme for a diagnostic autonomous control strategy of a power plant feed water process is discussed. The control system is based on Model Predictive Control strategy. MPC, applying diagnostic information to optimise the control result and the availability of the process. In this paper condition monitoring and diagnostics are carried out by diagnostic algorithms based on models describing the general properties and characteristics of monitored components as a function of operating points and time. However, information from any kind of diagnosis system can be applied. The diagnostic information is used to update the constraints and control increment weights in the cost function under which the MPC system calculates optimal control signals. The proposed system is able to change the dynamics and the structure of control system automatically during the operation of the process, if any malfunctions have been detected

IFAC-PapersOnLine, 2019

Micro-size hydro power plants are commonly used at remote areas to supply islanded AC micro-grids... more Micro-size hydro power plants are commonly used at remote areas to supply islanded AC micro-grids. A typical way to control grid frequency is to manipulate active power dissipated in ballast loads by AC/AC converters. However, conventional asymmetrically switched thyristor controlled converters consume reactive power degrading the power factor at the generator output and transmission efficiency. In this paper the operation of a symmetric angle switched, bridged three-phase rectifier and three single-phase rectifiers connected in series with ballast load, are studied to improve the power factor of the system. The objective is to evaluate the characteristics of these two configurations to improve the power factor by reactive power compensation in the frequency control of an islanded micro hydropower system.

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Special Issue: Fault Tolerant Control of Power Grids Peter Odgaard, Christophe Aubrun, Yrjo Majanne

A scheme for a diagnostic autonomous control strategy of a power plant feed water process is disc... more A scheme for a diagnostic autonomous control strategy of a power plant feed water process is discussed. The control system is based on Model predictive Control strategy. MPC, applying diagnostic information to optimise the control result and the availability of the process. In this paper condition monitoring and diagnostics are carried out by diagnostic algorithms based on models describing the general properties and characteristics of monitored components as a function of operating points and time. However, information from any kind of diagnosis system can be applied. The diagnostic information is used to update the constraints and control increment weights in the cost function under which the MPC system calculates optimal control signals. The proposed system is able to change the dynamics and the structure of control system automatically during the operation of the process, if any malfunctions have been detected.

On-line diagnosis system for power plant components and subprocesses is presented. The system is ... more On-line diagnosis system for power plant components and subprocesses is presented. The system is based on fault selective diagnosis algorithms applied to on-line process measurements. The algorithms calculate specific characteristics from monitored components in order to determine their operating state. User interface, system updating and system configuration are implemented on an expert system. The procedural algorithm level and the expert system level are separated into different computers. Different type of knowledge are divided into hierarchical levels in order to keep the system consistent, easily maintainable and fast enough for real time operation.

IFAC-PapersOnLine

Abstract Since 2013, the biggest Caribbean island, Cuba, has been undertaking an energy matrix ch... more Abstract Since 2013, the biggest Caribbean island, Cuba, has been undertaking an energy matrix change. There is a strong political intention to replace fossil fuels by renewable energy and improve efficiency and security of the national energy system. By 2030, 24% of electric power shall be produced from renewable sources. Transition from centralized fossil fuel fired power system towards distributed renewable generation based system requires changes to conventional energy planning and system design procedures as well as physical structures of the national energy system. This paper introduces three analysis axis: Scenario building for future supply-demand balance, scenario for a 100% renewable energy system for Cuba, and a roadmap from existing power system to the system with high share of distributed renewable generation. This work is a part of European Union funded Erasmus+ project “Capacity Building for Renewable Energy Planning in Cuban Higher Education Institutions”, CRECE.

IFAC Proceedings Volumes

Abstract The purpose of this paper is to present some possibilities of fault detection of a filte... more Abstract The purpose of this paper is to present some possibilities of fault detection of a filter. The study is based on process measurements in a chemical plant. By using on-line measurements the characteristic features of normal and damaged filter are studied and the degradation model of the filter is presented. The possibilities to on-line fault diagnosis are introduced. The reasons for filter damages and how these can be avoided are also introduced. It is also shown that with some changes in the construction of the filter its operational life time can be increased. Some preliminary results of off-line fault diagnosis is presented.

IEEE Control Systems Magazine, 1987

ABSTRACT Large variations in moisture content and heat value of fuels (peat, bark, coal) can caus... more ABSTRACT Large variations in moisture content and heat value of fuels (peat, bark, coal) can cause stability problems in combustion. Some computer-based methods to improve the measurement and control of solid fuel boilers have been developed. A microprocessor-based four-beam infrared moisture measurement system has been developed, which has advantages compared with ordinary two-beam sensors. The paper also presents a digital measuring station for estimating the fuel power of the plant. Furthermore, flame monitors might give a false "flame-off" indication even if the fuel is still burning. The system developed herein estimates the changes of the combustion process by comparing the amount of flue gases generated in the process with the fuel and air feed. By adding this information to the signals obtained from the flame monitoring system, the existence of the flame can be verified. Finally, load level and combustion conditions in industrial power plants vary continuously, and when solid fuels are used, the optimal excess air in the flue gas does not stay constant. We have developed and tested a method for minimizing the losses of the boiler.

Proceedings of IEEE Systems Man and Cybernetics Conference - SMC, 1993

ABSTRACT It has proved to be difficult to apply model based diagnosis methods to process industry... more ABSTRACT It has proved to be difficult to apply model based diagnosis methods to process industry because of high development and maintenance efforts and real time requirements (Al applications). Hierarchical structure is one way to make model based systems easier to apply by decomposing the system into small and simple submodels. This paper presents the research work made about the hierarchical fault systems in the Control Engineering Laboratory of Tampere University of Technology (TUT)

Control Science and Technology for Development, 1986

International Journal of Robust and Nonlinear Control, 2014

ABSTRACT This special issue contains article on fault detection and isolation and fault tolerant ... more ABSTRACT This special issue contains article on fault detection and isolation and fault tolerant control methods applied to different aspects of modern power grids, both for detection, isolation and accommodating faults in the power grid, and for detection, isolation and accommodation of faults in power generating units. Copyright © 2014 John Wiley & Sons, Ltd.

Control Engineering Practice, 1995

... 1993, Le Touquet, France. Majanne, Y., Ruokonen, T. and Kurki, M. (1991): Hierarchical Online... more ... 1993, Le Touquet, France. Majanne, Y., Ruokonen, T. and Kurki, M. (1991): Hierarchical Online Diagnosis System for Power Plants. IFAC IMACS Symposium on Fault Detection, Supervision and Safety for Technical Processes Safeprocess'91. BadenBaden, Germany. Patton, R ...