The paper presents a methodology to estimate the rotor angle of a synchronous generator by using ... more The paper presents a methodology to estimate the rotor angle of a synchronous generator by using measurements from phasor measurement units (PMUs). Based on the available measurements, an observer for the damper currents is designed. Using the observed damper currents, known machine parameters, and PMU measurements, stator reactances of the machine are estimated during transients following a disturbance. These updated reactances are then used to find the rotor angle of the generator. Application of the proposed method on a test power system shows promising results.
2007 IEEE International Symposium on Intelligent Signal Processing, 2007
Abstract This paper proposes a method for optimal placement of phasor measurement units (PMUs) fo... more Abstract This paper proposes a method for optimal placement of phasor measurement units (PMUs) for measuring the states of a power system. A method to compute the measurement uncertainty associated with the estimated states is also illustrated in the paper. The PMU placement strategy ensures complete observability of the power system states for normal operating conditions, as well as under the loss of a single transmission line or even a single measurement unit. An integer quadratic programming approach is used to minimize the ...
2014 IEEE PES General Meeting | Conference & Exposition, 2014
Monitoring of the power system states in real time, especially after the occurrence of a fault, c... more Monitoring of the power system states in real time, especially after the occurrence of a fault, can enhance the situational awareness of the power system operators. Although the state estimator is designed for monitoring steady state conditions of the power system, the advent of Synchronized Measurement Technology (SMT) can make the state estimator a helpful tool for monitoring the power system operating condition in quasi real time. In this paper, the use of a linear state estimator using only synchronized phasor measurements will be presented. The innovation lies in the use of the linear state estimator for the estimation of the states of the system in the presence of a fault. With the proper PMU placement, all system buses can be monitored accurately and the voltage/angle behavior can be tracked with precision.
2013 IEEE Power & Energy Society General Meeting, 2013
ABSTRACT Network reduction techniques are attractive options for the analysis of large, complex p... more ABSTRACT Network reduction techniques are attractive options for the analysis of large, complex power systems. In the process of network reduction, the original measurements usually get transformed along with the network parameters. It is therefore essential to take into account these transformations in applications such as state estimation. This paper presents a methodology for determining the relation between the measurements in the reduced system and the measurements in the original system. State estimation can then be carried out with the help of the transformed measurements. The developed method is applied on the IEEE 14 bus and IEEE 118 bus test systems.
ABSTRACT One common problem associated with interconnected power systems is that the complete top... more ABSTRACT One common problem associated with interconnected power systems is that the complete topology information and measurement data of the areas are not generally available or difficult to handle in real-time. This paper proposes a methodology to determine in real-time the reduced networks for the systems external to a given area. A sensitivity-based methodology is proposed to identify the nodes to be retained from the external areas. A network reduction methodology is then used to obtain the reduced equivalent for the entire system. A real-time network parameter adjustment algorithm is subsequently used to update the parameters of the reduced network under changes in operating condition. The proposed methods are validated with the help of the modified IEEE 14-bus and IEEE 118-bus systems.
The paper presents a methodology to estimate the rotor angle of a synchronous generator by using ... more The paper presents a methodology to estimate the rotor angle of a synchronous generator by using measurements from phasor measurement units (PMUs). Based on the available measurements, an observer for the damper currents is designed. Using the observed damper currents, known machine parameters, and PMU measurements, stator reactances of the machine are estimated during transients following a disturbance. These updated reactances are then used to find the rotor angle of the generator. Application of the proposed method on a test power system shows promising results.
2007 IEEE International Symposium on Intelligent Signal Processing, 2007
Abstract This paper proposes a method for optimal placement of phasor measurement units (PMUs) fo... more Abstract This paper proposes a method for optimal placement of phasor measurement units (PMUs) for measuring the states of a power system. A method to compute the measurement uncertainty associated with the estimated states is also illustrated in the paper. The PMU placement strategy ensures complete observability of the power system states for normal operating conditions, as well as under the loss of a single transmission line or even a single measurement unit. An integer quadratic programming approach is used to minimize the ...
2014 IEEE PES General Meeting | Conference & Exposition, 2014
Monitoring of the power system states in real time, especially after the occurrence of a fault, c... more Monitoring of the power system states in real time, especially after the occurrence of a fault, can enhance the situational awareness of the power system operators. Although the state estimator is designed for monitoring steady state conditions of the power system, the advent of Synchronized Measurement Technology (SMT) can make the state estimator a helpful tool for monitoring the power system operating condition in quasi real time. In this paper, the use of a linear state estimator using only synchronized phasor measurements will be presented. The innovation lies in the use of the linear state estimator for the estimation of the states of the system in the presence of a fault. With the proper PMU placement, all system buses can be monitored accurately and the voltage/angle behavior can be tracked with precision.
2013 IEEE Power & Energy Society General Meeting, 2013
ABSTRACT Network reduction techniques are attractive options for the analysis of large, complex p... more ABSTRACT Network reduction techniques are attractive options for the analysis of large, complex power systems. In the process of network reduction, the original measurements usually get transformed along with the network parameters. It is therefore essential to take into account these transformations in applications such as state estimation. This paper presents a methodology for determining the relation between the measurements in the reduced system and the measurements in the original system. State estimation can then be carried out with the help of the transformed measurements. The developed method is applied on the IEEE 14 bus and IEEE 118 bus test systems.
ABSTRACT One common problem associated with interconnected power systems is that the complete top... more ABSTRACT One common problem associated with interconnected power systems is that the complete topology information and measurement data of the areas are not generally available or difficult to handle in real-time. This paper proposes a methodology to determine in real-time the reduced networks for the systems external to a given area. A sensitivity-based methodology is proposed to identify the nodes to be retained from the external areas. A network reduction methodology is then used to obtain the reduced equivalent for the entire system. A real-time network parameter adjustment algorithm is subsequently used to update the parameters of the reduced network under changes in operating condition. The proposed methods are validated with the help of the modified IEEE 14-bus and IEEE 118-bus systems.
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Papers by Saikat Chakrabarti