1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE... more 1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE 2Professor, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE ---------------------------------------------------------------------***---------------------------------------------------------------------Abstract In this paper, the open loop single area power generation system is modelled using state space representation. The output response which is frequency deviation at steady state is simulated using MATLAB. Then, Proportional Integral (PI) controller combined with Adaptive Fuzzy Logic (FL) controller is added to the system to understand the effect of conventional and modern control on system steady state output response. The performance of the system steady state output response is measured in terms of undershoot percentage, settling time, and steady state error. Simulation of the controlled system shows that PI controller combined with Adaptive FL contr...
The process of obtaining electrical energy from kinetic energy present in the winds is the main i... more The process of obtaining electrical energy from kinetic energy present in the winds is the main idea behind the wind turbine. There are various types of control strategies that have been presented in many journals. The most common control strategy involved is the Pitch Angle control. The speed of the wind turbine must be kept in check to avoid damage. In this paper, a pitch angle based speed control mechanism is presented by using two different types of control systems-PID and Fuzzy Logic. A comparison between both the systems is also documented.
In this paper, we examine the robust H-infinity filtering problem for a class of linear, uncertai... more In this paper, we examine the robust H-infinity filtering problem for a class of linear, uncertain discrete delay systems with Markovian jump parameters. The uncertainties are time-varying and norm-bounded parametric uncertainties and the delay factor is arbitrary constant. We provide initially a robust stochastic stability result with a prescribed performance measure. Then we design a linear causal filter using algebraic inequality procedure which ensures a prescribed disturbance attenuation level from the disturbance signal to the filtering error.
1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE... more 1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE 2Professor, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Recently, the renewable energy, especially wind energy, has been paid much attention due to the energy shortage and environmental concern. As the penetration of the wind energy into the electrical power grid is extensively increased, the influence of the wind turbine systems on the frequency and voltage stability becomes more and more significant [1]– [4]. Wind turbine rotor bears different types of loads; aerodynamic loads, gravitational loads and centrifugal loads. These loads cause fatigue and vibration in blades, which cause degradation to the rotor blades. These loads can be overcome and the amount of collected power can be controlled using a goo...
Frequency of power supply system needs to be kept constant or fixed irrespective of the varying c... more Frequency of power supply system needs to be kept constant or fixed irrespective of the varying changes in load demand in order to ensure the well-being of power generating equipment and delivery of good quality power at the demand side. This paper presents an enhanced digital PD controller for Load Frequency Control (LFC) of UAE power system based on a systematic method using Root Locus method. The controller is designed in continuous-mode and discretized in implementation with an optimally selected sampling period to circumvent any degradation of dynamic performance and instability that may arise from inappropriate sampling period. A single area reheat thermal system is taken into consideration with the proposed controller in role of load disturbance analysis and control of frequency deviation. The proposed digital controller is simple and effective and ensures that the overall system performance is in line with the desired response and transient requirements which in effect shows...
The automatic generation control (AGC) problem of multi-area power systems subject to actuator-fa... more The automatic generation control (AGC) problem of multi-area power systems subject to actuator-failures is translated into an equivalent problem of decentralized reliable feedback control under a class of control failures for a class of linear interconnected continuous-time systems having internal subsystem time-delays and additional time-delay couplings. The failure model takes into consideration possible outages or partial failures in every single actuator of each decentralized controller. A feasible linear matrix inequalities procedure is established for the effective construction of the control set under state feedback. The decentralized reliable feedback gains are determined by convex optimization over new parametrized LMIs at the subsystem level. The developed results are tested on a representative three-area power model.
The problems of delay-dependent robust stability and stabilization of a class of uncertain, linea... more The problems of delay-dependent robust stability and stabilization of a class of uncertain, linear discrete-time singular systems with state-delay are examined. The parametric uncertainties are assumed to be time-invariant and normbounded appearing in the state and delay matrices. A new system representation is developed to derive new delay-dependent stability criteria without relying on overbounding. A solution to delay-dependent state-feedback stabilization is obtained. Seeking computational convenience, all the developed results are cast in the format of linear matrix inequalities (LMIs) and a numerical example is presented.
Proceeding of the 1996 IEEE International Conference on Control Applications IEEE International Conference on Control Applications held together with IEEE International Symposium on Intelligent Control IEEE International Symposium on Computer-Aided Contro, 1996
The paper describes the application of fuzzy algorithms to the control of top brine temperature (... more The paper describes the application of fuzzy algorithms to the control of top brine temperature (TBT) of multi-stage flash (MSF) seawater desalination plants. A linearized model of a six inputs and six outputs 18-stage MSF plant is considered in this study. The transfer function matrix of this model is subjected to interaction between the loops. The design of fuzzy logic controller (FLC) for one of the important loops, namely the TBT loop is considered in detail. A set of fuzzy rules that make the controller look like a proportional-plus-derivative controller (PD-like FLC) is obtained and applied to a first order plus dead time approximation of the plant model. In order to improve the performance, an integration effect is added to the output of the PD-like FLC to produce PID-like FLC. A tuned version of the latter controller has been applied to the full plant model in its nonparametric form. The fuzzy controller was found to give good results compared to those obtained from the existing conventional controllers.
Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2009
This paper develops a new parameterized approach to the problems of delay-dependent analysis and ... more This paper develops a new parameterized approach to the problems of delay-dependent analysis and feedback stabilization for a class of linear continuous-time systems with time-varying delays. An appropriate Lyapunov-Krasovskii functional is constructed to exhibit the delay-dependent dynamics. The construction guarantees avoiding bounding methods and effectively deploying injecting parametrized variables to facilitate systematic analysis. Delay-dependent stability provides a characterization of linear matrix inequalities (LMIs)-based conditions under which the linear time-delay system is asymptotically stable with a γ-level £2 gain. By delay-dependent stabilization, a state-feedback scheme is designed to guarantee that the closed-loop switched system enjoys the delay-dependent asymptotic stability with a prescribed γ-level £2 gain. It is established that the methodology provides the least conservatism in comparison with other published methods. Extension to systems with convex-bounde...
[Proceedings 1992] The First IEEE Conference on Control Applications, 1992
A technique for the control of frequency deviation in interconnected power systems is introduced.... more A technique for the control of frequency deviation in interconnected power systems is introduced. The technique is based on the application of linear feedback H-infinity robust controllers in the power system model. The controller response should be fast enough to offset the frequency errors due to load variations. Simulation results show the superior performance of the proposed controllers compared with other classical as well as LQR controllers.<<ETX>>
In this work, the prediction of heavy petroleum fractions was significantly improved by using a b... more In this work, the prediction of heavy petroleum fractions was significantly improved by using a backpropagation neural network model. It was found that scaling the data, fed to the neural net, improved the convergence of the estimated parameter (viscosity) in reasonable time with acceptable accuracy. An absolute error of 3.4% was achieved which is found to be better than those by other conventional methods.
2013 7th IEEE GCC Conference and Exhibition (GCC), 2013
The load frequency control (LFC) problem is becoming more significant today in accordance with in... more The load frequency control (LFC) problem is becoming more significant today in accordance with increasing grid size, changing structure, integration of renewable energy sources, and complexity of interconnected power systems. In this paper the assessment of Active Disturbance Rejection Controller (ADRC) based LFC is presented. This control algorithm offers a new design concept and inherently robust controller building block that requires very little information about the system. It actively estimates and compensates for the effects of the unknown dynamics and disturbances. The control strategy was applied to a single isolated power area and then to three interconnected control areas. The simulation results showed that the used controller was able to maintain a robust performance and grid stability by minimizing the effect of disturbances caused by load variation and wind power penetration.
Proceedings of the 1996 IEEE International Symposium on Intelligent Control, 1996
In this paper a simulated comparison of fuzzy logic and neural network control of the truck backe... more In this paper a simulated comparison of fuzzy logic and neural network control of the truck backer-upper system is presented. The a i m of the controller is to back a truck to a loading dock which is a difficult task. It is a nonlinear control problem for which no traditional control system design method exists. We assumed that there were no linguistic rules available, and therefore the controllers were designed from the available numerical data only. We provided the same desired input-output pairs to both the neural and the fuzzy approaches, and compared the final control performance of both controllers. The results showed the superiority of the neural controller over the fuzzy one, when the later was influenced by the amount of overlapping between its sets and the missing rules from its rule base.
2011 2nd International Conference on Electric Power and Energy Conversion Systems (EPECS), 2011
The recent extensive application of permanent magnet synchronous motors (PMSM) in industry has be... more The recent extensive application of permanent magnet synchronous motors (PMSM) in industry has been stimulated by the worldwide energy-saving mission. In this study, the assessment of the dynamic performance of a traditional cascaded PI field oriented motion control of a PMSM drive system is presented in both simulation and a real time implementation of the control strategy. The tuning of the cascaded position, velocity, and current controllers was carried out experimentally and the results demonstrated the feasibility and effectiveness of the used control scheme for velocity and position loops. Finally, the motion command tracking performance of the cascaded PI field oriented control algorithm of SMPM system was found satisfactory.
Proceedings of IEEE Frontiers in Education Conference - FIE '93, 1993
In his keynote address at Frontiers in Education1 992[11, Professor Tompkins emphasized the great... more In his keynote address at Frontiers in Education1 992[11, Professor Tompkins emphasized the great importance of Re-engineering Engineering Education during the remaining years of this century. The National Science Foundation (NSF) has sponsored few engineering education coalitions pm aims, namely; ECSEL,
1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE... more 1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE 2Professor, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE ---------------------------------------------------------------------***---------------------------------------------------------------------Abstract In this paper, the open loop single area power generation system is modelled using state space representation. The output response which is frequency deviation at steady state is simulated using MATLAB. Then, Proportional Integral (PI) controller combined with Adaptive Fuzzy Logic (FL) controller is added to the system to understand the effect of conventional and modern control on system steady state output response. The performance of the system steady state output response is measured in terms of undershoot percentage, settling time, and steady state error. Simulation of the controlled system shows that PI controller combined with Adaptive FL contr...
The process of obtaining electrical energy from kinetic energy present in the winds is the main i... more The process of obtaining electrical energy from kinetic energy present in the winds is the main idea behind the wind turbine. There are various types of control strategies that have been presented in many journals. The most common control strategy involved is the Pitch Angle control. The speed of the wind turbine must be kept in check to avoid damage. In this paper, a pitch angle based speed control mechanism is presented by using two different types of control systems-PID and Fuzzy Logic. A comparison between both the systems is also documented.
In this paper, we examine the robust H-infinity filtering problem for a class of linear, uncertai... more In this paper, we examine the robust H-infinity filtering problem for a class of linear, uncertain discrete delay systems with Markovian jump parameters. The uncertainties are time-varying and norm-bounded parametric uncertainties and the delay factor is arbitrary constant. We provide initially a robust stochastic stability result with a prescribed performance measure. Then we design a linear causal filter using algebraic inequality procedure which ensures a prescribed disturbance attenuation level from the disturbance signal to the filtering error.
1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE... more 1Graduate Student, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE 2Professor, Dept. of Electrical Engineering, Rochester Institute of Technology, Dubai, UAE ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Recently, the renewable energy, especially wind energy, has been paid much attention due to the energy shortage and environmental concern. As the penetration of the wind energy into the electrical power grid is extensively increased, the influence of the wind turbine systems on the frequency and voltage stability becomes more and more significant [1]– [4]. Wind turbine rotor bears different types of loads; aerodynamic loads, gravitational loads and centrifugal loads. These loads cause fatigue and vibration in blades, which cause degradation to the rotor blades. These loads can be overcome and the amount of collected power can be controlled using a goo...
Frequency of power supply system needs to be kept constant or fixed irrespective of the varying c... more Frequency of power supply system needs to be kept constant or fixed irrespective of the varying changes in load demand in order to ensure the well-being of power generating equipment and delivery of good quality power at the demand side. This paper presents an enhanced digital PD controller for Load Frequency Control (LFC) of UAE power system based on a systematic method using Root Locus method. The controller is designed in continuous-mode and discretized in implementation with an optimally selected sampling period to circumvent any degradation of dynamic performance and instability that may arise from inappropriate sampling period. A single area reheat thermal system is taken into consideration with the proposed controller in role of load disturbance analysis and control of frequency deviation. The proposed digital controller is simple and effective and ensures that the overall system performance is in line with the desired response and transient requirements which in effect shows...
The automatic generation control (AGC) problem of multi-area power systems subject to actuator-fa... more The automatic generation control (AGC) problem of multi-area power systems subject to actuator-failures is translated into an equivalent problem of decentralized reliable feedback control under a class of control failures for a class of linear interconnected continuous-time systems having internal subsystem time-delays and additional time-delay couplings. The failure model takes into consideration possible outages or partial failures in every single actuator of each decentralized controller. A feasible linear matrix inequalities procedure is established for the effective construction of the control set under state feedback. The decentralized reliable feedback gains are determined by convex optimization over new parametrized LMIs at the subsystem level. The developed results are tested on a representative three-area power model.
The problems of delay-dependent robust stability and stabilization of a class of uncertain, linea... more The problems of delay-dependent robust stability and stabilization of a class of uncertain, linear discrete-time singular systems with state-delay are examined. The parametric uncertainties are assumed to be time-invariant and normbounded appearing in the state and delay matrices. A new system representation is developed to derive new delay-dependent stability criteria without relying on overbounding. A solution to delay-dependent state-feedback stabilization is obtained. Seeking computational convenience, all the developed results are cast in the format of linear matrix inequalities (LMIs) and a numerical example is presented.
Proceeding of the 1996 IEEE International Conference on Control Applications IEEE International Conference on Control Applications held together with IEEE International Symposium on Intelligent Control IEEE International Symposium on Computer-Aided Contro, 1996
The paper describes the application of fuzzy algorithms to the control of top brine temperature (... more The paper describes the application of fuzzy algorithms to the control of top brine temperature (TBT) of multi-stage flash (MSF) seawater desalination plants. A linearized model of a six inputs and six outputs 18-stage MSF plant is considered in this study. The transfer function matrix of this model is subjected to interaction between the loops. The design of fuzzy logic controller (FLC) for one of the important loops, namely the TBT loop is considered in detail. A set of fuzzy rules that make the controller look like a proportional-plus-derivative controller (PD-like FLC) is obtained and applied to a first order plus dead time approximation of the plant model. In order to improve the performance, an integration effect is added to the output of the PD-like FLC to produce PID-like FLC. A tuned version of the latter controller has been applied to the full plant model in its nonparametric form. The fuzzy controller was found to give good results compared to those obtained from the existing conventional controllers.
Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering, 2009
This paper develops a new parameterized approach to the problems of delay-dependent analysis and ... more This paper develops a new parameterized approach to the problems of delay-dependent analysis and feedback stabilization for a class of linear continuous-time systems with time-varying delays. An appropriate Lyapunov-Krasovskii functional is constructed to exhibit the delay-dependent dynamics. The construction guarantees avoiding bounding methods and effectively deploying injecting parametrized variables to facilitate systematic analysis. Delay-dependent stability provides a characterization of linear matrix inequalities (LMIs)-based conditions under which the linear time-delay system is asymptotically stable with a γ-level £2 gain. By delay-dependent stabilization, a state-feedback scheme is designed to guarantee that the closed-loop switched system enjoys the delay-dependent asymptotic stability with a prescribed γ-level £2 gain. It is established that the methodology provides the least conservatism in comparison with other published methods. Extension to systems with convex-bounde...
[Proceedings 1992] The First IEEE Conference on Control Applications, 1992
A technique for the control of frequency deviation in interconnected power systems is introduced.... more A technique for the control of frequency deviation in interconnected power systems is introduced. The technique is based on the application of linear feedback H-infinity robust controllers in the power system model. The controller response should be fast enough to offset the frequency errors due to load variations. Simulation results show the superior performance of the proposed controllers compared with other classical as well as LQR controllers.<<ETX>>
In this work, the prediction of heavy petroleum fractions was significantly improved by using a b... more In this work, the prediction of heavy petroleum fractions was significantly improved by using a backpropagation neural network model. It was found that scaling the data, fed to the neural net, improved the convergence of the estimated parameter (viscosity) in reasonable time with acceptable accuracy. An absolute error of 3.4% was achieved which is found to be better than those by other conventional methods.
2013 7th IEEE GCC Conference and Exhibition (GCC), 2013
The load frequency control (LFC) problem is becoming more significant today in accordance with in... more The load frequency control (LFC) problem is becoming more significant today in accordance with increasing grid size, changing structure, integration of renewable energy sources, and complexity of interconnected power systems. In this paper the assessment of Active Disturbance Rejection Controller (ADRC) based LFC is presented. This control algorithm offers a new design concept and inherently robust controller building block that requires very little information about the system. It actively estimates and compensates for the effects of the unknown dynamics and disturbances. The control strategy was applied to a single isolated power area and then to three interconnected control areas. The simulation results showed that the used controller was able to maintain a robust performance and grid stability by minimizing the effect of disturbances caused by load variation and wind power penetration.
Proceedings of the 1996 IEEE International Symposium on Intelligent Control, 1996
In this paper a simulated comparison of fuzzy logic and neural network control of the truck backe... more In this paper a simulated comparison of fuzzy logic and neural network control of the truck backer-upper system is presented. The a i m of the controller is to back a truck to a loading dock which is a difficult task. It is a nonlinear control problem for which no traditional control system design method exists. We assumed that there were no linguistic rules available, and therefore the controllers were designed from the available numerical data only. We provided the same desired input-output pairs to both the neural and the fuzzy approaches, and compared the final control performance of both controllers. The results showed the superiority of the neural controller over the fuzzy one, when the later was influenced by the amount of overlapping between its sets and the missing rules from its rule base.
2011 2nd International Conference on Electric Power and Energy Conversion Systems (EPECS), 2011
The recent extensive application of permanent magnet synchronous motors (PMSM) in industry has be... more The recent extensive application of permanent magnet synchronous motors (PMSM) in industry has been stimulated by the worldwide energy-saving mission. In this study, the assessment of the dynamic performance of a traditional cascaded PI field oriented motion control of a PMSM drive system is presented in both simulation and a real time implementation of the control strategy. The tuning of the cascaded position, velocity, and current controllers was carried out experimentally and the results demonstrated the feasibility and effectiveness of the used control scheme for velocity and position loops. Finally, the motion command tracking performance of the cascaded PI field oriented control algorithm of SMPM system was found satisfactory.
Proceedings of IEEE Frontiers in Education Conference - FIE '93, 1993
In his keynote address at Frontiers in Education1 992[11, Professor Tompkins emphasized the great... more In his keynote address at Frontiers in Education1 992[11, Professor Tompkins emphasized the great importance of Re-engineering Engineering Education during the remaining years of this century. The National Science Foundation (NSF) has sponsored few engineering education coalitions pm aims, namely; ECSEL,
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