Publications
254 results found
Singh R, Pal B, Jabr R, 2010, Statistical Representation of Distribution System Loads Using Gaussian Mixture Model, IEEE-Power-and-Energy-Society General Meeting, Publisher: IEEE, ISSN: 1944-9925
Singh R, Pal BC, Jabr RA, 2010, Statistical Representation of Distribution System Loads Using Gaussian Mixture Model, IEEE Transactions on Power Systems, Vol: 25, Pages: 29-37
This paper presents a probabilistic approach for statistical modeling of the loads in distribution networks. In a distribution network, the probability density functions (pdfs) of loads at different buses show a number of variations and cannot be represented by any specific distribution. The approach presented in this paper represents all the load pdfs through Gaussian mixture model (GMM). The expectation maximization (EM) algorithm is used to obtain the parameters of the mixture components. The performance of the method is demonstrated on a 95-bus generic distribution network model.
Kunjumuhammed LP, Singh R, Pal BC, 2010, Probability based control signal selection for inter area oscillations damping using TCSC, IEEE Power and Energy Society General Meeting, Minneapolis, Pages: 1-6-1-6, ISSN: 1944-9925
Mcdonald J, Pal B, STrbac G, et al., 2009, Benefits of a risk-based comparison of electrical distribution system operation
This work examines the potential benefits of treating the comparison of the suitability of different modes of distribution network operation as a risk assessment problem, as a contrast to traditional measures of reliability. A methodology is proposed for determining the range and comparative likelihood of possible "costs" involved in choosing to operate a distribution network in a given manner. The methodology is applied in a distribution test system to produce a measure of risk to which the network is exposed under both normal and perturbed system operating conditions. The results will give an indication of some of the benefits of providing operators with a clearer understanding of the apparent risks faced in controlling a potentially active distribution network.
Jabr RA, Pal BC, 2009, Ordinal optimisation approach for locating and sizing of distributed generation, IET GENERATION TRANSMISSION & DISTRIBUTION, Vol: 3, Pages: 713-723, ISSN: 1751-8687
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- Citations: 120
Singh R, Pal BC, Jabr RA, 2009, Choice of estimator for distribution system state estimation, IET Generation, Transmission & Distribution, Vol: 3, Pages: 666-678, ISSN: 1751-8687
In this study, a statistical framework is introduced to assess the suitability of various state estimation (SE) methodologies for the purpose of distribution system state estimation (DSSE). The existing algorithms adopted in the transmission system SE are reconfigured for the distribution system. The performance of three SE algorithms has been examined and discussed in standard 12-bus and 95-bus UK-GDS network models.
Jabr RA, Pal BC, 2009, Computing closest saddle node bifurcations in a radial system via conic programming, INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS, Vol: 31, Pages: 243-248, ISSN: 0142-0615
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- Citations: 9
Singh R, Pal BC, Vinter RB, 2009, Measurement Placement in Distribution System State Estimation, IEEE Transactions on Power Systems, Vol: 24, Pages: 668-675, ISSN: 0885-8950
This paper introduces a technique for meter placement for the purpose of improving the quality of voltage and angle estimates across a network. The proposed technique is based on the sequential improvement of a bivariate probability index governing relative errors in voltage and angle at each bus. The meter placement problem is simplified by transforming it into a probability bound reduction problem, with the help of the two sided-Chebyshev inequality. A straightforward solution technique is proposed for the latter problem, based on the consideration of 2-$sigma$ error ellipses. The benefits of the proposed technique are revealed by Monte Carlo simulations on a 95-bus UKGDS network model
Laila DS, Messina AR, Pal BC, 2009, A refined Hilbert-Huang transform with applications to interarea oscillation monitoring, IEEE Transactions on Power Systems, Vol: 24, Pages: 610-620, ISSN: 0885-8950
This paper focuses on the refinement of standard Hilbert–Huang transform (HHT) technique to accurately characterize time varying, multicomponents interarea oscillations. Several improved masking techniques for empirical mode decomposition (EMD) and a local Hilbert transformer are proposed and a number of issues regarding their use and interpretation are identified. Simulated response data from a complex power system model are used to assess the efficacy of the proposed techniques for capturing the temporal evolution of critical system modes. It is shown that the combination of the proposed methods result in superior frequency and temporal resolution than other approaches for analyzing complicated nonstationary oscillations.
Jabr RA, Pal BC, 2009, Intermittent Wind Generation in Optimal Power Flow Dispatching, IET Generation, Transmision and Distribution, Vol: 3, Pages: 66-74
Bell KRW, Fenton W, Griffiths H, et al., 2009, The Power Academy in the UK: A Successful Initiative to Attract Graduates to the Power Industry, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 2772-+, ISSN: 1944-9925
Laila DS, Roman Messina A, Pal BC, 2009, Variants of Hilbert-Huang Transform with Applications to Power Systems' Oscillatory Dynamics, INTER-AREA OSCILLATIONS IN POWER SYSTEMS: A NONLINEAR AND NONSTATIONARY PERSPECTIVE, Editors: Messina, Publisher: SPRINGER, Pages: 63-100, ISBN: 978-0-387-89529-1
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- Citations: 5
Laila DS, Larsson M, Pal BC, et al., 2009, Nonlinear damping computation and envelope detection using Hilbert transform and its application to power systems wide area monitoring, 2009 IEEE Power and Energy Society General Meeting
McDonald JDF, Pal BC, Lang PD, 2009, Significance of an Operational Measure of Distribution Network Reliability, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 3935-3942, ISSN: 1944-9925
Simfukwe D, Pal BC, Begovic M, et al., 2009, Control of power system static stability using distributed static series compensators, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 3994-3999, ISSN: 1944-9925
Pal BC, Mei F, 2008, On the modelling adequacy of the DFIG for small signal stability studies in power systems, IET Journal of Renewable Power Generation, Vol: 2, Pages: 181-190
The dynamics of the doubly fed induction generator (DFIG) with a closed-loop control is analysed. The analysis provides explanations of the impact of the closed-loop control on the DFIG dynamics and relevant modelling requirements for power system stability studies. The discussion considers generic PI controllers for the regulation of rotor speed, reactive power and pitch angle. It is shown that for the closed-loop-controlled DFIG, a simplified model, whereby both stator and rotor dynamics are neglected, is adequate. In such model, stator and rotor variables are algebraic, that is, they change instantaneously and the modelled dynamics are those of the controllers and mechanical parts. The observations and conclusions are obtained from eigenvalue, participation factor and time-domain analysis.
Jabr RA, Pal BC, 2008, AC Network State Estimation Using Linear Measurement Functions, IET Journal Generation, Transmission and Distribution, Vol: 2, Pages: 1-6
The real/reactive power and current magnitude measurements can be accounted for in an AC network state estimator using linear measurement functions. The nonlinearity in the conventional AC state estimator equations is transferred from the measurement functions into a system of nonlinear equality constraints which is independent of the measurement set. The new format of equations entails two advantages. First, it can be easily integrated in optimisation routines which employ first- and second-order derivative functions. Second, the linear measurement functions can benefit from scaling techniques which are well documented in the linear programming literature. This research details the implementation of a least absolute value state estimator employing the new format of equations. The optimisation method is based on a primal-dual interior-point method that can accurately account for zero injection measurements and power directions. Numerical testing is used to validate the approach for networks with measurement sets that are (i) conventional and (ii) have a high proportion of current magnitude measurements and power signs.
Singh R, Pal BC, Jabr RA, et al., 2008, Distribution System Load Flow Using Primal Dual Interior Point Method, Joint International Conference on Power Systems Technology (POWERCON)/IEEE Power India Conference, Publisher: IEEE, Pages: 1404-+
Fu L, Pal BC, Cory BJ, 2008, Phasor Measurement Application for Power System Voltage Stability Monitoring, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 4953-4960, ISSN: 1944-9925
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- Citations: 8
Mei F, Pal BC, 2008, Modelling of doubly-fed induction generator for power system stability study, General Meeting of the IEEE-Power-and-Energy-Society, Publisher: IEEE, Pages: 287-294, ISSN: 1944-9925
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- Citations: 27
Mei F, Pal B, 2007, Modal analysis of grid-connected doubly fed induction generators, IEEE TRANSACTIONS ON ENERGY CONVERSION, Vol: 22, Pages: 728-736, ISSN: 0885-8969
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- Citations: 225
Mei F, Pal B, 2007, Modal Analysis of Grid Connected Doubly-Fed Induction Generators, IEEE Transactions on Energy Conversion, Vol: 22, Pages: 728-736
This paper presents the modal analysis of a gridconnected doubly fed induction generator (DFIG). The change in modal properties for different system parameters, operating points, and grid strengths are computed and observed. The results offer a better understanding of theDFIG intrinsic dynamics,which can also be useful for control design and model justification. Index Terms—Doubly fed induction generator, eigenvalue analysis, nonlinear dynamic model, small-signal stability.
Mei F, Pal BC, 2007, Modal Analysis of Grid Connected Doubly-Fed Induction Generators, IEEE Transactions on Energy Conversion, Vol: 22, Pages: 728-736
Jabr R A, Pal B C, 2007, A Conic Programming Approach for Static Voltage Stability Analysis in Radial Networks, IET Generation Transmission & Distribution, Pages: 203-208
That the problem of computing the capacity limit of a radial distribution system can be formulated as a second-order cone program is shown. The implications of the conic programming formulation are 2-fold. First, the load capability of the radial system can be obtained using existing efficient implementations of polynomial time interior-point algorithms, thus avoiding the need for running a sequence of load flow solutions. Secondly, the conic objective function yields a voltage stability indicator (SI). This indicator quantifies the maximum percentage by which the current load profile can be uniformly increased before voltage collapse occurs. The proposed method is validated by computing the load capability and voltage SIs of 11 different distribution systems. Comparisons are carried out with five previously published voltage SIs
Majumder R, Chaudhuri B, Pal BC, 2007, Implementation and test results of a wide-area measurement-based controller for damping interarea oscillations considering signal-transmission delay, IET GENER TRANSM DIS, Vol: 1, Pages: 1-7
The paper describes the implementation of a centralised control-design scheme in a real-time laboratory-based dynamic simulator. A centralised multivariable-control algorithm is designed employing remote feedback signals considering delay in signal transmission. The transmitted signals can be used for multiple-swing-mode damping using a single controller. Such an algorithm is numerically intensive owing to the high controller size and the predictor that takes care of the delay in signal transmission. The performance of the proposed controller is demonstrated by practical implementation using a rapid-prototyping controller mounted on a PC-ATX. Results of the experimental tests are shown for a detailed model of the power system implemented using Linux PC-based multiprocessor technology.
Majumder R, Chaudhuri B, Pal B C, 2007, Implementation and test results of a wide area measurementbased controller for damping inter-area oscillations considering, IET Generation, Transmission & Distribution, Vol: 1, Pages: 1-7
Korba P, Larsson M, Chaudhuri B, et al., 2007, Towards real-time implementation of adaptive damping controllers for FACTS devices, IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 3002-3007, ISSN: 1932-5517
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- Citations: 4
McDonald JDF, Pal BC, Lang PD, 2007, Representation of distribution system reliability during network restoration and repair, IEEE-Power-Engineering-Society General Meeting, Publisher: IEEE, Pages: 4151-+, ISSN: 1932-5517
Majumder R, Pal BC, Chaudhuri B, et al., 2007, Design and real time implementation of LMI based robust damping controllers for power systems, IEEE International Conference on System of Systems Engineering, Publisher: IEEE, Pages: 654-660
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