Nickie Menemenlis - Academia.edu (original) (raw)
Papers by Nickie Menemenlis
IEEE Power Engineering Review, 1981
A novel method for finding the steady-state solution in HVDC analysis is reported. The method is ... more A novel method for finding the steady-state solution in HVDC analysis is reported. The method is fast, economical and accurate because it ex¬ ploits fully the properties of periodicity-in-T, transposed periodicity-in-T/6, balanced 3-phase symmetry in the ac circuit, and the properties of linear circuit theory. The method contributes towards making the digital computer a working tool for HVDC analysis.
IEEE Transactions on Power Apparatus and Systems, 1980
A novel method for finding the steady-state solution in HVDC analysis is reported. The method is ... more A novel method for finding the steady-state solution in HVDC analysis is reported. The method is fast, economical and accurate because it ex¬ ploits fully the properties of periodicity-in-T, transposed periodicity-in-T/6, balanced 3-phase symmetry in the ac circuit, and the properties of linear circuit theory. The method contributes towards making the digital computer a working tool for HVDC analysis.
Third Generation Mobile Telecommunication Systems, 2001
Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304), 1999
For long-term propagation the signal envelop fluctuations This paper discusses the use of stochas... more For long-term propagation the signal envelop fluctuations This paper discusses the use of stochastic differential equations to model signal envelope variations over areas, which are subject to short-term fading effects. The short-term fading effects are modeled using Ornstein-Uhlenbeck processes and they are derived from first principles, using the scattering assumption of electromagnetic waves. This gives rise to signal envelope variations which follow a mean-reverting squareroot process, which is elastically pulled towards a long-term mean which characterizes the propagation environment. The derived signal envelope distributions include generalizations of Rayleigh, Ricean Nakagami etc. distributions to their non-stationary analogs and thus generalizing channel models to include time variations. From these computations the second order statistics of the received signal are obtained.
Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304), 1999
This paper discusses the use of stochastic differential equations and point processes to model th... more This paper discusses the use of stochastic differential equations and point processes to model the long-term fading effects during transmission of electromagnetic waves over large areas, which are subject to multipaths and power loss due to long distance transmission and reflections. When measured in dB's, the power loss follows a mean reverting Ornstein-Uhlenbeck process, which implies that the power loss is log-normally distributed. The arrival times of different paths are modeled using non-homogeneous Poisson counting processes and their statistical properties of the multipath power loss are examined. The moment generating function of the received signal is calculated and subsequently exploited to derive a central limit theorem, and the second-order statistics of the channel.
IEEE/AFCEA EUROCOMM 2000. Information Systems for Enhanced Public Safety and Security (Cat. No.00EX405), 2000
Page 1. General Non-Stationary Models for Short-Term and Long-Term Fading Channels Charalambos D.... more Page 1. General Non-Stationary Models for Short-Term and Long-Term Fading Channels Charalambos D. Charalambous* Nickie Menemenlis School of Information Technology and Eng. University of Ottawa, Ottawa, Ontario Tel (613) 562-5800x6215 chadcha@site.uottawa.ca ...
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001
The analysis, modeling and simulation of time-varying multipath wireless fading channels is usual... more The analysis, modeling and simulation of time-varying multipath wireless fading channels is usually done through inpiit-output descriptions of the channel. In this paper, we introduce the concept of the state of the channel which is the solution of stochastic differential equations driven by white-noise (Brownian motion). In particular, we show that the dynamics of the instantaneous power associated with each path can be modeled using mean-reverting Ornstein-Uhlenbeck processes, and higher order models. These models are easy t o analyze, implement and simulate, and therefore are important in the design and operation of wireless commimication systems. The densities of these state processes are given by generalizations of the standard Rayleigh, Ricean, Nakagami-in densities.
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001
ABSTRACT We introduce, the use of the shot-noise analysis, brought forward by Rice (1944), as a n... more ABSTRACT We introduce, the use of the shot-noise analysis, brought forward by Rice (1944), as a natural tool in computing the various statistical properties of the multipath fading channels, in wireless communications. By adapting and generalizing this theory we derive the various statistical properties of the channel, including the second-order statistics, generalizations of Campbell's theorem and central-limit theorems
Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228), 2001
Proceedings of the 41st IEEE Conference on Decision and Control, 2002., 2002
Identifying the statistical characteristics of the received signal in wireless communications pla... more Identifying the statistical characteristics of the received signal in wireless communications plays an important role in the design of different functions of the overall communications system. We demonstrate here that the density of the overall received signal, in multipath fading channels, deviates from the Gaussian, which is traditionally assumed. Using Edgeworth series expansion we provide explicit expressions in calculating this
2011 IEEE Power and Energy Society General Meeting, 2011
This paper reviews the notion of flexibility and applies it to the problem of power system adequa... more This paper reviews the notion of flexibility and applies it to the problem of power system adequacy of supply and reserve computations in the face of a class of input uncertainties. It first presents some definitions given to flexibility and flexibility indices in the power systems and process control industries. This is by no means a comprehensive review, but it does highlight some of the main ideas in the field. The notion of flexibility is applied to assess the quality of a solution strategy, based on some initial criterion for a given scenario, for example reliability, and then on its success in satisfying a set of scenarios. The paper then illustrates the use of a flexibility index borrowed from the process control literature to evaluate a solution strategy that provides balancing reserves to mitigate wind generation uncertainties. The paper concludes that flexibility can only be obtained at a cost and that it could prove itself to be a useful tool for the operator in an emerging technological environment.
IEEE Transactions on Power Systems, 1998
In this paper, the authors first develop a simple noniterative equation representing the dynamic ... more In this paper, the authors first develop a simple noniterative equation representing the dynamic hysteresis phenomenon. Secondly, they delineate two successful methodologies for implementing the dynamic hysteresis model in real-time. The model was validated using a capacitor coupled voltage transformer (CCVT) and a magnetic type voltage transformer (VT) model obtained from measurements performed in IREQ's laboratories on real units. Tests
As new load and generation technologies accompanied by inherent uncertainties are integrated into... more As new load and generation technologies accompanied by inherent uncertainties are integrated into power systems, utilities should plan to revise their balancing reserves in order to mitigate the consequences of forecast errors. One such technology is wind power generation. To this end, Hydro-Québec has put forward a novel methodology calculating the level of these balancing reserves, over the time horizon of 1-48 hours, based on the risk that the load will exceed the committed generation capacity. The methodology reported in this paper requires as input the statistical characteristics of the load and wind generation forecast errors and of the generation outages, but it is general enough to accommodate other technologies displaying forecast uncertainties The implementation details of this methodology as well a discussion of the nature of the results are given.
Large-scale wireless channel models are commonly used to describe the power-loss of signals, when... more Large-scale wireless channel models are commonly used to describe the power-loss of signals, when the transmitter-receiver separation distance is large and the propagation environment is not heavily populated. In mobile communications, the relative movement between the transmitter and the receiver and dynamic variations in the propagation environment, contribute to the dynamical spatial characteristics of the channel. This paper introduces linear
IEEE International Conference on Communications, 2001
This paper is a continuation of a companion paper, in which multipath fading channels (MFC) are f... more This paper is a continuation of a companion paper, in which multipath fading channels (MFC) are formulated as generalizations of the shot-noise analysis in investigating the statistical properties of wireless channels and their responses to different signals. These include second-order statistics, generalizations of Campbell's theorem and central-limit theorems. An application of the results to wide-sense-stationary-uncorrelated-scattering (WSSUS) channels reveals the effects
2013 IEEE Power & Energy Society General Meeting, 2013
ABSTRACT A challenge now facing utilities is how to adjust reserves in the operations-planning ho... more ABSTRACT A challenge now facing utilities is how to adjust reserves in the operations-planning horizon of 0 to 48 hours ahead to mitigate the effects of wind variability and forecast uncertainties, in addition to those of load uncertainties and unavailability of generation. Reserves are maintained to ensure a high level of reliability and security to the system. They are subdivided into two groups: those responding within an intrahourly time horizon to regulate power imbalances, and those responding over a 1-48 hours ahead time horizon addressing the net forecast uncertainties. In this paper, we present a methodology for calculating reserves in the latter category, referred to as balancing reserves (BRs), following the integration of wind generation in a power system. Their computation is based on maintaining a predefined level of risk. The novelty here is that wind forecast error distributions are adjusted as a function of wind generation forecast levels. Gamma-like distributions with time-varying parameters, estimated from real data, were chosen to approximate the wind generation forecast errors. It is shown that this improved modeling significantly modifies the values of required balancing reserves and associated risk. The methodology developed is based on a clear criterion, namely risk, and it demonstrates the imperativeness of considering dynamic balancing reserves as a function of the imminent wind generation forecast.
42nd IEEE International Conference on Decision and Control (IEEE Cat. No.03CH37475), 2003
This paper introduces a novel methodology for the calculation of the maximum power transfer betwe... more This paper introduces a novel methodology for the calculation of the maximum power transfer between two points in large electric power networks. It takes advantage that the problem possesses only one degree of freedom. Consequently, an optimization algorithm using a quadratic approximation of the load flow equations is tractable, and provides a fairly accurate solution in a single iteration. It
IEEE Power Engineering Review, 1981
A novel method for finding the steady-state solution in HVDC analysis is reported. The method is ... more A novel method for finding the steady-state solution in HVDC analysis is reported. The method is fast, economical and accurate because it ex¬ ploits fully the properties of periodicity-in-T, transposed periodicity-in-T/6, balanced 3-phase symmetry in the ac circuit, and the properties of linear circuit theory. The method contributes towards making the digital computer a working tool for HVDC analysis.
IEEE Transactions on Power Apparatus and Systems, 1980
A novel method for finding the steady-state solution in HVDC analysis is reported. The method is ... more A novel method for finding the steady-state solution in HVDC analysis is reported. The method is fast, economical and accurate because it ex¬ ploits fully the properties of periodicity-in-T, transposed periodicity-in-T/6, balanced 3-phase symmetry in the ac circuit, and the properties of linear circuit theory. The method contributes towards making the digital computer a working tool for HVDC analysis.
Third Generation Mobile Telecommunication Systems, 2001
Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304), 1999
For long-term propagation the signal envelop fluctuations This paper discusses the use of stochas... more For long-term propagation the signal envelop fluctuations This paper discusses the use of stochastic differential equations to model signal envelope variations over areas, which are subject to short-term fading effects. The short-term fading effects are modeled using Ornstein-Uhlenbeck processes and they are derived from first principles, using the scattering assumption of electromagnetic waves. This gives rise to signal envelope variations which follow a mean-reverting squareroot process, which is elastically pulled towards a long-term mean which characterizes the propagation environment. The derived signal envelope distributions include generalizations of Rayleigh, Ricean Nakagami etc. distributions to their non-stationary analogs and thus generalizing channel models to include time variations. From these computations the second order statistics of the received signal are obtained.
Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304), 1999
This paper discusses the use of stochastic differential equations and point processes to model th... more This paper discusses the use of stochastic differential equations and point processes to model the long-term fading effects during transmission of electromagnetic waves over large areas, which are subject to multipaths and power loss due to long distance transmission and reflections. When measured in dB's, the power loss follows a mean reverting Ornstein-Uhlenbeck process, which implies that the power loss is log-normally distributed. The arrival times of different paths are modeled using non-homogeneous Poisson counting processes and their statistical properties of the multipath power loss are examined. The moment generating function of the received signal is calculated and subsequently exploited to derive a central limit theorem, and the second-order statistics of the channel.
IEEE/AFCEA EUROCOMM 2000. Information Systems for Enhanced Public Safety and Security (Cat. No.00EX405), 2000
Page 1. General Non-Stationary Models for Short-Term and Long-Term Fading Channels Charalambos D.... more Page 1. General Non-Stationary Models for Short-Term and Long-Term Fading Channels Charalambos D. Charalambous* Nickie Menemenlis School of Information Technology and Eng. University of Ottawa, Ottawa, Ontario Tel (613) 562-5800x6215 chadcha@site.uottawa.ca ...
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001
The analysis, modeling and simulation of time-varying multipath wireless fading channels is usual... more The analysis, modeling and simulation of time-varying multipath wireless fading channels is usually done through inpiit-output descriptions of the channel. In this paper, we introduce the concept of the state of the channel which is the solution of stochastic differential equations driven by white-noise (Brownian motion). In particular, we show that the dynamics of the instantaneous power associated with each path can be modeled using mean-reverting Ornstein-Uhlenbeck processes, and higher order models. These models are easy t o analyze, implement and simulate, and therefore are important in the design and operation of wireless commimication systems. The densities of these state processes are given by generalizations of the standard Rayleigh, Ricean, Nakagami-in densities.
ICC 2001. IEEE International Conference on Communications. Conference Record (Cat. No.01CH37240), 2001
ABSTRACT We introduce, the use of the shot-noise analysis, brought forward by Rice (1944), as a n... more ABSTRACT We introduce, the use of the shot-noise analysis, brought forward by Rice (1944), as a natural tool in computing the various statistical properties of the multipath fading channels, in wireless communications. By adapting and generalizing this theory we derive the various statistical properties of the channel, including the second-order statistics, generalizations of Campbell's theorem and central-limit theorems
Proceedings of the 40th IEEE Conference on Decision and Control (Cat. No.01CH37228), 2001
Proceedings of the 41st IEEE Conference on Decision and Control, 2002., 2002
Identifying the statistical characteristics of the received signal in wireless communications pla... more Identifying the statistical characteristics of the received signal in wireless communications plays an important role in the design of different functions of the overall communications system. We demonstrate here that the density of the overall received signal, in multipath fading channels, deviates from the Gaussian, which is traditionally assumed. Using Edgeworth series expansion we provide explicit expressions in calculating this
2011 IEEE Power and Energy Society General Meeting, 2011
This paper reviews the notion of flexibility and applies it to the problem of power system adequa... more This paper reviews the notion of flexibility and applies it to the problem of power system adequacy of supply and reserve computations in the face of a class of input uncertainties. It first presents some definitions given to flexibility and flexibility indices in the power systems and process control industries. This is by no means a comprehensive review, but it does highlight some of the main ideas in the field. The notion of flexibility is applied to assess the quality of a solution strategy, based on some initial criterion for a given scenario, for example reliability, and then on its success in satisfying a set of scenarios. The paper then illustrates the use of a flexibility index borrowed from the process control literature to evaluate a solution strategy that provides balancing reserves to mitigate wind generation uncertainties. The paper concludes that flexibility can only be obtained at a cost and that it could prove itself to be a useful tool for the operator in an emerging technological environment.
IEEE Transactions on Power Systems, 1998
In this paper, the authors first develop a simple noniterative equation representing the dynamic ... more In this paper, the authors first develop a simple noniterative equation representing the dynamic hysteresis phenomenon. Secondly, they delineate two successful methodologies for implementing the dynamic hysteresis model in real-time. The model was validated using a capacitor coupled voltage transformer (CCVT) and a magnetic type voltage transformer (VT) model obtained from measurements performed in IREQ's laboratories on real units. Tests
As new load and generation technologies accompanied by inherent uncertainties are integrated into... more As new load and generation technologies accompanied by inherent uncertainties are integrated into power systems, utilities should plan to revise their balancing reserves in order to mitigate the consequences of forecast errors. One such technology is wind power generation. To this end, Hydro-Québec has put forward a novel methodology calculating the level of these balancing reserves, over the time horizon of 1-48 hours, based on the risk that the load will exceed the committed generation capacity. The methodology reported in this paper requires as input the statistical characteristics of the load and wind generation forecast errors and of the generation outages, but it is general enough to accommodate other technologies displaying forecast uncertainties The implementation details of this methodology as well a discussion of the nature of the results are given.
Large-scale wireless channel models are commonly used to describe the power-loss of signals, when... more Large-scale wireless channel models are commonly used to describe the power-loss of signals, when the transmitter-receiver separation distance is large and the propagation environment is not heavily populated. In mobile communications, the relative movement between the transmitter and the receiver and dynamic variations in the propagation environment, contribute to the dynamical spatial characteristics of the channel. This paper introduces linear
IEEE International Conference on Communications, 2001
This paper is a continuation of a companion paper, in which multipath fading channels (MFC) are f... more This paper is a continuation of a companion paper, in which multipath fading channels (MFC) are formulated as generalizations of the shot-noise analysis in investigating the statistical properties of wireless channels and their responses to different signals. These include second-order statistics, generalizations of Campbell's theorem and central-limit theorems. An application of the results to wide-sense-stationary-uncorrelated-scattering (WSSUS) channels reveals the effects
2013 IEEE Power & Energy Society General Meeting, 2013
ABSTRACT A challenge now facing utilities is how to adjust reserves in the operations-planning ho... more ABSTRACT A challenge now facing utilities is how to adjust reserves in the operations-planning horizon of 0 to 48 hours ahead to mitigate the effects of wind variability and forecast uncertainties, in addition to those of load uncertainties and unavailability of generation. Reserves are maintained to ensure a high level of reliability and security to the system. They are subdivided into two groups: those responding within an intrahourly time horizon to regulate power imbalances, and those responding over a 1-48 hours ahead time horizon addressing the net forecast uncertainties. In this paper, we present a methodology for calculating reserves in the latter category, referred to as balancing reserves (BRs), following the integration of wind generation in a power system. Their computation is based on maintaining a predefined level of risk. The novelty here is that wind forecast error distributions are adjusted as a function of wind generation forecast levels. Gamma-like distributions with time-varying parameters, estimated from real data, were chosen to approximate the wind generation forecast errors. It is shown that this improved modeling significantly modifies the values of required balancing reserves and associated risk. The methodology developed is based on a clear criterion, namely risk, and it demonstrates the imperativeness of considering dynamic balancing reserves as a function of the imminent wind generation forecast.
42nd IEEE International Conference on Decision and Control (IEEE Cat. No.03CH37475), 2003
This paper introduces a novel methodology for the calculation of the maximum power transfer betwe... more This paper introduces a novel methodology for the calculation of the maximum power transfer between two points in large electric power networks. It takes advantage that the problem possesses only one degree of freedom. Consequently, an optimization algorithm using a quadratic approximation of the load flow equations is tractable, and provides a fairly accurate solution in a single iteration. It