Sudipto Bhowmik | Washington State University (original) (raw)
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Papers by Sudipto Bhowmik
I would like to thank my advisors for being extremely patient and understanding with me during my... more I would like to thank my advisors for being extremely patient and understanding with me during my entire time in WSU. All of them were very helpful in guiding me in the right direction at the same time allowing me the liberty to learn and grow. Secondly I would like to thank my parents for their continuous support and belief in me I would also like to thank people who made my experience at Washington State University a wonderful one. To name a few, Ruby Young, Francie Bose, Mohammad Vaziri. Lastly I would like to thank certain unnamed people for teaching me valuable lessons on life's challenges.
In the near future the electric power grid will have its hardwired and inflexible control infrast... more In the near future the electric power grid will have its hardwired and inflexible control infrastructure augmented with distributed systems technologies and protocols. In this position paper we argue that the survivability of the grid must not be implemented and assessed with these two networks (power and communication) in isolation, as is the current practice. Rather, a combined analysis must be conducted. We also provide three examples of ongoing research we are conducting in this area illustrating this.
The electric power industry by its very nature must have its supply and demand in very close bala... more The electric power industry by its very nature must have its supply and demand in very close balance at all times. Supply (generation) needs to be matched accurately and in real-time to demand, otherwise unbalance can result in partial or complete breakdown of the grid [1]. Recent deregulation is allowing many more participants in the power grid. Unfortunately, its status dissemination
Impediments to Survivability of the Electric Power Grid and Some Collaborative EE-CS Research Iss... more Impediments to Survivability of the Electric Power Grid and Some Collaborative EE-CS Research Issues to Solve Them David Bakken, Anjan Bose, Curtis Dyreson, Sudipto Bhowmik, Ioanna Dionysiou, Harald Gjermundrod, Lin Xu School of Electrical Engineering and Computer Science Washington State University Pullman, Washington 99164-2752 USA {bakken,bose,cdyreson,sbhowmik,idionysi,kgjermun,lxu2}@eecs.wsu.edu
The availability and integrity of the electric power grid heavily depends on maintaining a very c... more The availability and integrity of the electric power grid heavily depends on maintaining a very close balance between its supply and demand. To achieve that balance, grid operators rely on real-time status information from grid entities such as generators and substations. Failing to match supply to demand accurately and in real-time can result in partial or complete breakdown of the grid [MR99]. Thus the information infrastructure is a critical component for reliable grid operations. The power grid today has a very basic, hardwired data acquisition infrastructure suited for the monopoly in generating, transmitting and managing power that was present at design time (see Figure 1). Its status dissemination network was designed over 30 years ago and although the hardware has been upgraded over time, the overall design is still the same. This infrastructure cannot support status information dissemination to the many different participants, created as a result of the recent deregulation ...
I would also like to thank people who made my experience at Washington State University a wonderf... more I would also like to thank people who made my experience at Washington State University a wonderful one. To name a few, Ruby Young, Francie Bose, Mohammad Vaziri. Lastly I would like to thank certain unnamed people for teaching me valuable lessons on life's challenges. iv
Energy and Power Engineering
Nowadays, power quality issues are becoming a significant research topic because of the increasin... more Nowadays, power quality issues are becoming a significant research topic because of the increasing inclusion of very sensitive devices and considerable renewable energy sources. In general, most of the previous power quality classification techniques focused on single power quality events and did not include an optimal feature selection process. This paper presents a classification system that employs Wavelet Transform and the RMS profile to extract the main features of the measured waveforms containing either single or complex disturbances. A data mining process is designed to select the optimal set of features that better describes each disturbance present in the waveform. Support Vector Machine binary classifiers organized in a "One Vs Rest" architecture are individually optimized to classify single and complex disturbances. The parameters that rule the performance of each binary classifier are also individually adjusted using a grid search algorithm that helps them achieve optimal performance. This specialized process significantly improves the total classification accuracy. Several single and complex disturbances were simulated in order to train and test the algorithm. The results show that the classifier is capable of identifying >99% of single disturbances and >97% of complex disturbances.
ii To the Faculty of Washington State University:
The need of developing a widely distributed and well interconnected communication system for mana... more The need of developing a widely distributed and well interconnected communication system for managing competitive markets for ancillary services, such as load following and frequency control, has brought to light new issues related to the reliability, and sometimes to the security, of power systems. Signal delays, in such a communication system, are becoming almost physiological. The delivery time of a signal packet a generator receives from the center may become uncertain due to these delays. We intend to show how anomalous signals may impact frequency response and to propose some changes to improve the system performance.
In the near future the electric power grid will have its hardwired and inflexible control infrast... more In the near future the electric power grid will have its hardwired and inflexible control infrastructure augmented with distributed systems technologies and protocols. In this position paper we argue that the survivability of the grid must not be implemented and assessed with these two networks (power and communication) in isolation, as is the current practice. Rather, a combined analysis must be conducted. We also provide three examples of ongoing research we are conducting in this area illustrating this.
Expert Systems with Applications, 2015
In this paper we propose a method based on a combination of binary classifiers which are optimize... more In this paper we propose a method based on a combination of binary classifiers which are optimized for those special cases where the real signals contain a multitude of events within the analyzed temporal window. These type of events are known as complex events. The proposed Power Quality (PQ) classifier is based on Wavelet Transforms (WT) and Support Vector Machines (SVM). The method uses a One vs. One multiclass SVM. We propose a novel method which is simple, easy to train, and can be implemented with low computational cost. The proposed algorithm consists of a set of simple binary SVM classifiers. Each SVM node is trained separately allowing them to be parallelized. The training stage is performed using single events, however due to the structure of the SVM methodology selected, it allows the system to detect complex events. Tests and training were performed using real complex signals and the results show the proposed methodology to be highly efficient.
2014 IEEE Biennial Congress of Argentina (ARGENCON), 2014
IEEE Transactions on Power Systems, 2004
With deregulation of the power generation sector, the necessity for an enhanced and open communic... more With deregulation of the power generation sector, the necessity for an enhanced and open communication infrastructure to support an increasing variety of ancillary services is apparent. A duplex and distributed communication system seems to be the most suitable solution to meet and ensure good quality of these services. Parameters needed and additional limits introduced by this new communication topology must be investigated and defined. This paper focuses on the communication network requirements for a third party load frequency control service. Data communication models are proposed based on queuing theory. Simulation is performed to model the effects of certain types of signal delays on this ancillary service.
I would like to thank my advisors for being extremely patient and understanding with me during my... more I would like to thank my advisors for being extremely patient and understanding with me during my entire time in WSU. All of them were very helpful in guiding me in the right direction at the same time allowing me the liberty to learn and grow. Secondly I would like to thank my parents for their continuous support and belief in me I would also like to thank people who made my experience at Washington State University a wonderful one. To name a few, Ruby Young, Francie Bose, Mohammad Vaziri. Lastly I would like to thank certain unnamed people for teaching me valuable lessons on life's challenges.
In the near future the electric power grid will have its hardwired and inflexible control infrast... more In the near future the electric power grid will have its hardwired and inflexible control infrastructure augmented with distributed systems technologies and protocols. In this position paper we argue that the survivability of the grid must not be implemented and assessed with these two networks (power and communication) in isolation, as is the current practice. Rather, a combined analysis must be conducted. We also provide three examples of ongoing research we are conducting in this area illustrating this.
The electric power industry by its very nature must have its supply and demand in very close bala... more The electric power industry by its very nature must have its supply and demand in very close balance at all times. Supply (generation) needs to be matched accurately and in real-time to demand, otherwise unbalance can result in partial or complete breakdown of the grid [1]. Recent deregulation is allowing many more participants in the power grid. Unfortunately, its status dissemination
Impediments to Survivability of the Electric Power Grid and Some Collaborative EE-CS Research Iss... more Impediments to Survivability of the Electric Power Grid and Some Collaborative EE-CS Research Issues to Solve Them David Bakken, Anjan Bose, Curtis Dyreson, Sudipto Bhowmik, Ioanna Dionysiou, Harald Gjermundrod, Lin Xu School of Electrical Engineering and Computer Science Washington State University Pullman, Washington 99164-2752 USA {bakken,bose,cdyreson,sbhowmik,idionysi,kgjermun,lxu2}@eecs.wsu.edu
The availability and integrity of the electric power grid heavily depends on maintaining a very c... more The availability and integrity of the electric power grid heavily depends on maintaining a very close balance between its supply and demand. To achieve that balance, grid operators rely on real-time status information from grid entities such as generators and substations. Failing to match supply to demand accurately and in real-time can result in partial or complete breakdown of the grid [MR99]. Thus the information infrastructure is a critical component for reliable grid operations. The power grid today has a very basic, hardwired data acquisition infrastructure suited for the monopoly in generating, transmitting and managing power that was present at design time (see Figure 1). Its status dissemination network was designed over 30 years ago and although the hardware has been upgraded over time, the overall design is still the same. This infrastructure cannot support status information dissemination to the many different participants, created as a result of the recent deregulation ...
I would also like to thank people who made my experience at Washington State University a wonderf... more I would also like to thank people who made my experience at Washington State University a wonderful one. To name a few, Ruby Young, Francie Bose, Mohammad Vaziri. Lastly I would like to thank certain unnamed people for teaching me valuable lessons on life's challenges. iv
Energy and Power Engineering
Nowadays, power quality issues are becoming a significant research topic because of the increasin... more Nowadays, power quality issues are becoming a significant research topic because of the increasing inclusion of very sensitive devices and considerable renewable energy sources. In general, most of the previous power quality classification techniques focused on single power quality events and did not include an optimal feature selection process. This paper presents a classification system that employs Wavelet Transform and the RMS profile to extract the main features of the measured waveforms containing either single or complex disturbances. A data mining process is designed to select the optimal set of features that better describes each disturbance present in the waveform. Support Vector Machine binary classifiers organized in a "One Vs Rest" architecture are individually optimized to classify single and complex disturbances. The parameters that rule the performance of each binary classifier are also individually adjusted using a grid search algorithm that helps them achieve optimal performance. This specialized process significantly improves the total classification accuracy. Several single and complex disturbances were simulated in order to train and test the algorithm. The results show that the classifier is capable of identifying >99% of single disturbances and >97% of complex disturbances.
ii To the Faculty of Washington State University:
The need of developing a widely distributed and well interconnected communication system for mana... more The need of developing a widely distributed and well interconnected communication system for managing competitive markets for ancillary services, such as load following and frequency control, has brought to light new issues related to the reliability, and sometimes to the security, of power systems. Signal delays, in such a communication system, are becoming almost physiological. The delivery time of a signal packet a generator receives from the center may become uncertain due to these delays. We intend to show how anomalous signals may impact frequency response and to propose some changes to improve the system performance.
In the near future the electric power grid will have its hardwired and inflexible control infrast... more In the near future the electric power grid will have its hardwired and inflexible control infrastructure augmented with distributed systems technologies and protocols. In this position paper we argue that the survivability of the grid must not be implemented and assessed with these two networks (power and communication) in isolation, as is the current practice. Rather, a combined analysis must be conducted. We also provide three examples of ongoing research we are conducting in this area illustrating this.
Expert Systems with Applications, 2015
In this paper we propose a method based on a combination of binary classifiers which are optimize... more In this paper we propose a method based on a combination of binary classifiers which are optimized for those special cases where the real signals contain a multitude of events within the analyzed temporal window. These type of events are known as complex events. The proposed Power Quality (PQ) classifier is based on Wavelet Transforms (WT) and Support Vector Machines (SVM). The method uses a One vs. One multiclass SVM. We propose a novel method which is simple, easy to train, and can be implemented with low computational cost. The proposed algorithm consists of a set of simple binary SVM classifiers. Each SVM node is trained separately allowing them to be parallelized. The training stage is performed using single events, however due to the structure of the SVM methodology selected, it allows the system to detect complex events. Tests and training were performed using real complex signals and the results show the proposed methodology to be highly efficient.
2014 IEEE Biennial Congress of Argentina (ARGENCON), 2014
IEEE Transactions on Power Systems, 2004
With deregulation of the power generation sector, the necessity for an enhanced and open communic... more With deregulation of the power generation sector, the necessity for an enhanced and open communication infrastructure to support an increasing variety of ancillary services is apparent. A duplex and distributed communication system seems to be the most suitable solution to meet and ensure good quality of these services. Parameters needed and additional limits introduced by this new communication topology must be investigated and defined. This paper focuses on the communication network requirements for a third party load frequency control service. Data communication models are proposed based on queuing theory. Simulation is performed to model the effects of certain types of signal delays on this ancillary service.