T.S. Sidhu

University of Ontario Institute of Technology, QWA, Ontario, Canada

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Publications (157)99.04 Total impact

  • Sarasij Das · Tarlochan Sidhu
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    ABSTRACT: A fault-transient synchrophasor is computed over a window of pre-fault and fault samples. A fault synchrophasor is computed over a window of fault samples only. Fault-transient synchrophasors are discarded and are generally not used in the synchrophasor applications. Recently, an algorithm has been proposed to compute fault synchrophasor from fault-transient synchrophasor in phasor data concentrator (PDC). The accuracy of the existing algorithm deteriorates due to fault-induced transients and inaccurate fault starting time. A robust algorithm has been proposed to compute fault synchrophasor from fault-transient synchrophasor in PDC. The proposed algorithm does not use fault starting time in the calculations. It also performs better than the existing algorithm when fault-induced transients are present in the signal. The proposed algorithm is simple, non-iterative and performs satisfactorily in various investigated scenarios. The advantage of the proposed algorithm has been demonstrated in the context of fault location application.
    No preview · Article · Jan 2015 · IET Generation Transmission & Distribution
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    Sarasij Das · Tarlochan Sidhu
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    ABSTRACT: Shannon’s Nyquist theorem has always dictated the conventional signal acquisition policies. Power system is not an exception to this. As per this theory, the sampling rate must be at least twice the maximum frequency present in the signal. Recently, compressive sampling (CS) theory has shown that the signals can be reconstructed from samples obtained at sub-Nyquist rate. Signal reconstruction in this theory is exact for “sparse signals” and is near exact for compressible signals provided certain conditions are satisfied. CS theory has already been applied in communication, medical imaging, MRI, radar imaging, remote sensing, computational biology, machine learning, geophysical data analysis, and so forth. CS is comparatively new in the area of computer based power system monitoring. In this paper, subareas of computer based power system monitoring where compressive sampling theory has been applied are reviewed. At first, an overview of CS is presented and then the relevant literature specific to power systems is discussed.
    Preview · Article · Nov 2014
  • Sarasij Das · Tarlochan Sidhu
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    ABSTRACT: Faults and switching operations often cause step changes in voltage and current waveforms. A fault/switching transient synchrophasor is computed over a window of pre- and post-fault/switching samples. Many synchrophasor applications are not designed to use these transient synchrophasors. So, there is a need to detect fault/switching transient synchrophasors. A robust algorithm is proposed to detect synchrophasors computed over switching/fault transients. The proposed algorithm runs in phasor measurement unit. The proposed algorithm performs satisfactorily in the presence of noises, harmonics, off nominal frequencies, decaying DC and missing/bad samples. The proposed algorithm can detect fault/switching transient synchrophasors caused by smaller or larger disturbances. The proposed algorithm is simple, non-iterative and mainly needs additions. Possible applications of the proposed algorithm are also discussed.
    No preview · Article · Sep 2014 · IET Generation Transmission & Distribution
  • Sneha Lele · Robert Sobot · Tarlochan Sidhu
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    ABSTRACT: We present a novel microsystem methodology to detect voltage and current disturbances in high power distribution lines. Our system employs a custom designed piezoelectric transformer operating at 50/60 Hz, as an alternative to the bulky electromagnetic transformer, to detect disturbances up to few kilohertz. In the frequency range of 10 Hz to 250 Hz, the piezotransformer steps down the 10–150 V input voltage with a linearity of ${pm}{1%}$ . This stepped down piezo output is treated with a signal processing system designed based on frequency composition of the piezo signal, to generate a digital output. A 7-bit digital output from this system reports various types of line disturbances within 3 ms of occurrence. We present details of the proposed system, supported both by numerical simulations and experimental results.
    No preview · Article · May 2014 · IEEE Sensors Journal
  • Mohamed Elsamahy · S.O. Faried · T.S. Sidhu
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    ABSTRACT: This paper explores the impact of a transmission-line midpoint STATCOM on the performance of the generator loss-of-excitation (LOE) protection. In this context, investigations are conducted on a two-hydrogenerator power station for two LOE contingencies, namely, a complete LOE due to a field-winding short circuit and a partial LOE due to a sudden drop in the excitation voltage at different generator loadings. The results of these investigations show that the midpoint STATCOM has adverse impacts on the LOE distance relay in the form of delay time and/or underreach phenomenon. These adverse impacts vary with the generator loading and the LOE mode. The time-domain simulation studies are conducted using PSCAD/EMTDC software.
    No preview · Article · Apr 2014 · IEEE Transactions on Power Delivery
  • Sarasij Das · Tarlochan Sidhu
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    ABSTRACT: In this paper, a simple synchrophasor estimation algorithm has been proposed considering power system steady state, dynamic conditions, and protection requirements. The new IEEE Standard C37.118.1-2011 for synchrophasor measurements includes the dynamic performance requirements for the phasor measurement units. It is shown that the proposed method satisfies all the steady state and dynamic requirements of the new IEEE Standard. Presently, synchrophasors are mainly used for wide area monitoring. Increasingly, synchrophasors are being considered for protection applications in smart grids. Protection applications require shorter response times and lower overshoot/undershoot values for estimated phasors during large disturbances. It is shown that the proposed method performs satisfactorily during system faults, which is an important requirement for protection applications. A detailed performance comparison with the existing phasor estimation algorithms has also been presented.
    No preview · Article · Oct 2013 · IEEE Transactions on Instrumentation and Measurement
  • Sarasij Das · Tarlochan Sidhu
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    ABSTRACT: The IEEE standard C37.118.1-2011 specifies performance requirements for the synchrophasor measurements. In this standard, the maximum modulation frequency for the phasor domain oscillations is 5 Hz. The synchrophasor reporting rates below 10 frames/s are exempted from the dynamic requirements of the standard. Synchrophasors reported below 10 frames/s cannot be used in the dynamics monitoring applications due to violation of the Nyquist theory (considering maximum 5 Hz oscillation frequency). Recently, compressive sampling (CS) theory has generated significant interest in the signal processing community because of its potential to enable signal reconstruction from fewer samples than suggested by the Nyquist rate. In this paper, the CS theory has been used to reconstruct the signal dynamics at higher rates using synchrophasors reported at the sub-Nyquist rate. This cannot be achieved in the conventional interpolation theory due to aliasing. As an example, in this paper, synchrophasors of an amplitude and frequency modulated (5 Hz) waveform are reported at 8 frames/s; thus causing aliasing. This aliased data is used in the phasor data concentrators (PDCs) to accurately (low TVE) reconstruct the synchrophasors at 24 frames/s rate using CS theory. The results indicate that the CS theory may also be useful in reducing the communication bandwidth requirements.
    No preview · Conference Paper · Feb 2013
  • Sarasij Das · Tarlochan Sidhu
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    ABSTRACT: Synchrophasors are increasingly used in the wide area monitoring applications. Computational window lengths of the practical synchrophasor estimation filters are often multiple fundamental cycles long to achieve robustness. In many situations, the window length of the synchrophasor estimation filter is greater than the fault clearing time. In this case, there are not enough fault samples within the window to compute a synchrophasor corresponding to the fault condition. So, transient state synchrophasors are only available for use in this case. A fault transient synchrophasor is computed over a window consisting of pre-fault and fault samples. Currently, these transient synchrophasors are discarded and generally not used in the applications. In this paper, an algorithm is proposed to compute fault voltage/current synchrophasor from a fault transient synchrophasor value. The novelty of the proposed algorithm is that this algorithm can be used in a Phasor Data Concentrator (PDC). The proposed algorithm is simple, non-iterative and performs satisfactorily in presence of noise. One possible application of the proposed algorithm is in the fault location on transmission lines where the fault clearing time is lower than the estimation filter window length.
    No preview · Conference Paper · Jan 2013
  • M. Elsamahy · S.O. Faried · T.S. Sidhu
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    ABSTRACT: In this paper, investigations are carried out to explore the impact of generator distance phase backup protection (Relay (21)) on the generator overexcitation thermal capability. These investigations have included the performance of Relay (21) when it is set to provide thermal backup for the generator during two common system disturbances, namely a system fault and a sudden application of a large system load while the overexcitation limiter (OEL) is in service. The results of these investigations have shown that the current setting of Relay (21) for generator thermal backup protection restricts the overexcitation thermal capability of the generator. Such a restriction does not allow the generator to supply its maximum reactive power during such events. The paper highlights the need for conducting in-depth dynamic stability studies to evaluate the existing setting of the generator distance phase backup protection relay in order to allow the generator to fulfill the system requirements during major disturbances to ensure adequate level of voltage stability.
    No preview · Conference Paper · Oct 2012
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    ABSTRACT: Cyber security in interconnected smart grid is vital for reliability of power system operations. Power communication applications are different from cooperate information technology applications. Utilities that follow defense in depth strategy have to confront many network security technologies. This paper presents an application of IPSec tunnel in substation gateways. IPSec Encapsulating Security Payload (ESP) tunnels are selected for our experiments. Since security overhead of cyber security measures introduce additional delays, several performance tests are conducted on IPSec ESP tunnels. The results are used to determine the balance between security and performance of IPSec ESP tunnel on substation gateways.
    No preview · Conference Paper · Sep 2012
  • Sneha Lele · Robert Sobot · Tarlochan Sidhu
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    ABSTRACT: A novel line monitoring methodology based on piezoelectric transformer (PT) is proposed. The frequency range of operation and magnitude levels for voltage sensing are discussed and experimental results are presented. The experimental results show that a PT sustains high input voltages at power-line frequency and steps it down while stepping up the transient high frequency tones. Hence, an unexplored low-frequency region of operation of the PT is exploited and proposed in line frequency measurement and disturbance monitoring.
    No preview · Article · Feb 2012
  • D. Bejmert · T.S. Sidhu
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    ABSTRACT: The interconnection of distributed generators (DG) to existing network may give rise to many technical problems. To ensure appropriate power quality and stability of the grid these problems should be recognized and solved. For this purpose, behaviour of such energy sources, under various disturbances, must be studied and known to the distribution grid operators. In this paper fault current contribution from large scale photovoltaic (PV) power plant as well as protection issues concerning such DGs are discussed. The mentioned problems were investigated in PSCAD model of 50 MW grid-connected PV power plant where various operating condition of the network and penetration levels of PV were considered.
    No preview · Article · Jan 2012
  • S. Lele · R. Sobot · T. Sidhu
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    ABSTRACT: We present a numerical model based on three-dimensional (3D) finite element modelling for the piezoelectric transformer (PT). The resonant frequency and low frequency regions of operation of PT for voltage sensing are discussed and experimental results are presented. Results from the numerical analysis are compared with these established results. Hence, a model suitable for low frequency voltage measurements and disturbance monitoring in power systems is proposed and developed with a scope for future design modifications.
    No preview · Conference Paper · Jan 2012
  • M. Sheikholeslamzadeh · T.S. Sidhu
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    ABSTRACT: This paper presents modeling and analysis of four passive relays used in distributed generation passive anti-islanding protection schemes. The passive Overcurrent (OC), OV/UV, OF/UF, and ROCOF (Rate of Change of Frequency) relays are commonly used for DG anti-islanding protection because of their low cost and relative simplicity. The relays modeling are based on the commercial digital relays hardware and considering Discrete Fourier Transform (DFT) as the phasor and frequency estimation algorithms in MATLAB environment. Then, the relay models are simulated on a practical radial distribution system embedding six-1.67 MW Doubly-Fed Induction Generators (DFIG) using PSCAD/EMTDC. The obtained results and analysis are reported and discussed. Finally, an intelligent scheme is suggested which takes advantage of an islanding-dedicated complementary system and improves the security of conventional ORed system of four relays.
    No preview · Conference Paper · Jan 2012
  • M. Elsamahy · S. O. Faried · T. S. Sidhu
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    ABSTRACT: In this paper, investigations carried out to explore the impact of a voltage sourced converter-based back-to-back on the performance of generator distance phase backup protection as well as on the coordination between such a protection and the generator overexcited steady-state capability limit. The voltage sourced converter-based back-to-back is installed to connect a weak and a strong systems. The results of the investigations show that the back-to-back has an adverse effect on the performance of generator distance phase backup protection. Such an impact varies according to the fault type, its location and the generator loading. Moreover, this adverse impact extends to affect the coordination between the generator distance phase backup protection and the generator overexcited steady-state capability limit. The dynamic simulations of a test benchmark are conducted using the PSCAD/EMTDC software.
    No preview · Article · Dec 2011
  • Tarlochan Sidhu · Mitalkumar Kanabar · Palak Parikh
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    ABSTRACT: The IEC 61850 standard part 8-1 proposes Generic Object Oriented Substation Event (GOOSE) message for time critical applications over the Ethernet network. In order to cover the wide range of applications and achieve flexibility in implementation, GOOSE messages are kept generic in the standard. However, this flexibility leads to configuration problem achieving multi-vendor interoperability. Therefore, some efforts have been carried out in this work to present a systematic GOOSE configuration approach, as well as, verification and performance testing of the GOOSE. First part of this paper configuration of Ethernet switched network, including IEEE 1588 based time synchronization, Rapid Spanning Tree Protocol (RSTP), and IEEE 802.1Q based Quality of Services (QoS). In the second part, the paper leads to step-by-step configuration process comprising IEC 61850 data modeling, datasets of GOOSE within individual IEDs, and system integration of GOOSE. Finally, the verification of configured GOOSE messages is presented using network analyzer tools, and performance testing time delay) over the network is carried out for various network scenarios.
    No preview · Article · Oct 2011
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    ABSTRACT: This paper addresses the subject of reducing outage durations and autorestoration applications within the distribution substation. Employment of intelligent electronic devices (IEDs) can aid in the reduction of the fault duration time, and also it enhances the protection, control, and monitoring at the distribution level. Further, communication among these IEDs can provide faster autorestoration, remote data analysis, event recording, etc. Many recent issues related to distribution substation protection are discussed and techniques to address these issues using current technologies are proposed.
    No preview · Article · Jul 2011 · IEEE Transactions on Power Delivery
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    ABSTRACT: An iterative technique based on orthogonal filters and frequency tracking is proposed to estimate harmonic components in power systems. The technique uses frequency interpolation to estimate fundamental frequency and harmonics when the nominal frequency of the signal is a non-integer value. Due to the number of computations involved during the generation of filter coefficients, an offline computation is suggested. Beneficial features of the proposed technique include fixed sampling rate and fixed data window size. The performance of the proposed technique is examined by simulating different power system operating conditions and evaluating the data from these simulations. A technique based on Fast Fourier Transform is also used to estimate the harmonic components for all the simulated signals. These estimates are compared with those obtained from the proposed technique. Results show that the proposed technique can converge to the accurate fundamental frequency and therefore, provide accurate harmonic components even when the fundamental frequency is not equal to the nominal frequency.
    Preview · Article · May 2011 · Journal of Electrical Engineering and Technology
  • M.R.D. Zadeh · T.S. Sidhu · A. Klimek
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    ABSTRACT: A directional comparison bus protection can provide a high-speed bus fault clearing in an IEC61850 process-bus environment. This technique is based on fault direction for each circuit connected to the protected bus. Compared to biased current differential protection, the loss of accurate time synchronisation of the individual merging units does not cause the bus protection based on directional comparison to lose security. The suitability of various practical directional techniques is investigated from the viewpoint of directional comparison bus protection for an IEC61850 process bus. A modification in the superimposed directional algorithm for bus protection is proposed to overcome the major problems resulted from breaker operations. As a part of this modification, a new technique is proposed to determine the bus voltage from feeder voltages to avoid the need for an additional three-phase CVT on the bus. PSCAD/EMTDC and MATLAB are utilised to simulate the power system and various directional algorithms, respectively. Results are reported and compared.
    No preview · Article · Mar 2011 · IET Generation Transmission & Distribution
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    ABSTRACT: This paper is about the development of a framework for the formal certification of software for masquerade detection based upon natural mimicry. A masquerade is when an intruder mimics a genuine user in order to compromise the security of a computer system. The framework consists of looking at mimicry in the natural world. Based on this, a model for mimicry is developed based on the principle of indiscernibility. This is followed by a look into the requirements for masquerade detection software. A formal model for an agent for masquerade detection is then derived which discerns the static attributes of the user as well as detects anomalies in the dynamic user behavior via a statistical classifier. This agent is then used for masquerade detection in the Human Machine Interface (HMI) of an industrial automation network.
    Full-text · Conference Paper · Jan 2011

Publication Stats

2k Citations
99.04 Total Impact Points

Institutions

  • 2012-2015
    • University of Ontario Institute of Technology
      • Faculty of Engineering and Applied Science
      QWA, Ontario, Canada
  • 2002-2012
    • The University of Western Ontario
      • Department of Electrical and Computer Engineering
      London, Ontario, Canada
  • 1989-2002
    • University of Saskatchewan
      • Department of Electrical and Computer Engineering
      Saskatoon, Saskatchewan, Canada