#### Nurul A. Chowdhury B.Sc., M.Eng., Ph.D.

Associate Professor of Electrical and Computer Engineering

- Room 3B44 Engineering Building
- (306) 966-5396
- nurul.chowdhury@usask.ca

Biography

Dr. Chowdhury teaches Electrical Machines I (EE 313.3), Electrical Engineering Laboratory II (EE 319.3), Electrical Engineering Laboratory III (EE 329.3) and Power Electronics (EE 482.3) at the undergraduate level and Economic System Operation (EE 867.3) at the graduate level.

Dr. Chowdhury's research experience is in the field of power system reliability, power system operation and economic system operation. He is particularly interested in reliability evaluation of generation systems and application of expert systems in power system operation.

His research has led to new methods for allocating spinning reserves in interconnected power systems. He has developed techniques for allocating operating reserves in multi-area systems with pool members of radically different sizes.

Current research projects include development of techniques to evaluate the economic benefit of non-utility generation on short term operation of power systems. The economic, social and political climate in which the electric power industry operates now has changed considerably during the last decade. Large energy projects are increasingly facing intense environmental scrutiny. Utilities are showing an increasing interest in non-utility generation (NUG) . The inclusion of NUG energy creates some special problems with respect to system operation. In most cases the NUG units are outside direct utility control and, therefore, non-dispatchable. The decision to buy energy from NUG has to be an economic one with proper attention given to system reliability. The main objective of this research work is to develop techniques to assess avoided operating cost to utilities resulting from utilities transactions with NUG.

A project on power system restoration is also under way. The principle objective of this research project is to develop an object-oriented simulation software with a case-based reasoning subsystem to train and guide system operators through the steps of restoration of a power system from a complete or partial blackout. The ever growing size and complexity of modern power systems, and rare occurrence of blackouts in relatively more reliable power systems make restoration problem more crucial and challenging than ever before. System operators do not have enough opportunities to gain working knowledge and experience on restoration of a power system. System operators must, therefore be trained to handle restoration processes and must be allowed to update their training on a periodic basis. Due to voluminous data and complex operation procedures involved during a restoration process, a tool that can manage all related data and coordinate the required steps will certainly minimize the blackout period. In a blackout situation, the proposed simulation software can be utilized to guide and assist system operators through the different steps of restoration on a real-time basis.

Publications

#### Selected Journal Papers

[10] | S. Islam and N. Chowdhury, 2001. "A Case-Based Windows Graphic Package for the Education and Training of Power System Restoration", IEEE Transactions on Power Systems, Vol. 16, No. 2, pp. 181-187. |

[9] | R. Gupta, N. Chowdhury and R. Billinton, 1998. "Economic Impact of Cogenerated Energy on a Power System", Journal of the Institute of Engineers, Singapore, Vol. 38, No. 6, pp. 43-47. |

[8] | N. Chowdhury and H. Khonsari, 1998. "Adequacy Assessment Using a Modified Four-State Model"; Quality and Reliability Engineering International, Volume 14, pp. 145-151. |

[7] | N. Chowdhury, R. Billinton and R. Gupta, 1995. "Avoided Operating Costs in Thermal Generating Systems", CEA Transactions, Paper No. 95-SP-53, Volume 34. |

[6] | N. Chowdhury, 1994. "Probabilistic Assessment of Spinning Reserve in Isolated and Interconnected Generation Systems", Reliability Engineering and System Safety, Special Issue, pp. 83-91. |

[5] | N.A. Chowdhury and S.K. Ahmad, 1993. "An Energy Based Probabilistic Approach for Spinning Reserve Assessment in Interconnected Generation Systems", CEA Transactions, Paper No. 93-SP-113, Volume 32. |

[4] | N. Chowdhury, 1993. "Energy Method of Spinning Reserve Assessment in Interconnected Generating Systems", IEEE Transactions on Power Systems, Vol. 8, No. 3, August, pp. 865-872. |

[3] | N. Chowdhury, R. Billinton, 1992. "Basic Concepts in Probabilistic Assessment of Operating Reserve in Interconnected Generating Systems", CEA Transactions, Engineering & Operating Division, Vol. 31, Part 4. |

[2] | N. Chowdhury, R. Billinton, 1991. "A Reliability Test System for Educational Purposes - Spinning Reserve Studies in Isolated and Interconnected Systems", IEEE Transactions on Power Systems, Vol. 6, No. 4, November, pp. 1578-1583. |

[1] | N. Chowdhury, R. Billinton, 1991. "Export/Import of Spinning Reserve in Interconnected Generation Systems", IEEE Transactions on Power Systems, Vol. 6, No. 2, February, pp. 43-50. |

#### Conference Publications

[13] | Rezaul Haque and N. Chowdhury, 2005, "AN ARTIFICIAL NEURAL NETWORK BASED TRANSMISSION LOSS ALLOCATION FOR BILATERAL CONTRACTS", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 2203-2207. [PDF] |

[12] | Ashikur Bhuiya and N. Chowdhury, 2005, "DETERMINATION OF LOSS FACTORS IN A DEREGULATED SYSTEM", Proceedings of IEEE Canadian Conference on Electrical and Computer Engineering, May 1-4, Saskatoon, Canada, pp. 0561-0565. [PDF] |

[11] | A. Bhuiya, N.Chowdhury, M. Huq, "Optimum Market Strategy for an Independent Power Producer", Proceedings (CDROM) of the 2004 IEEE Canadian Conference on Electrical and Computer Engineering, Niagara Falls, Ontario, Canada, May 2-5, 2004. |

[10] | Yong Zheng, N. Chowdhury, "Expansion of Transmission Systems in a Deregulated Environment", Proceeding (CDROM) of the 2004 Canadian Conference on Electrical and Computer Engineering, Niagara Falls, Ontario, Canada, May 2-5, 2004. |

[9] | N. Chowdhury and A. Bhuiya, 2002. "Transmission Loss Allocation in a Deregulated System: A Generalized Approach for Bilateral Contracts", Proceedings of the Australian Universities Power Engineering Conference, Melbourne, Australia, Sept. 29 - Oct. 2. |

[8] | N. Chowdhury and A. Bhuiya, 2001. "Determination of Transmission Loss Allocation in a Deregulated Power System Network with Counter-Flow", Proceedings of the Eighth International Middle East Power Systems Conference, Cairo, Egypt, December 29-31, pp. 921-926. |

[7] | N. Chowdhury and A. Bhuiya, 2001. "Counter-Flow in a Deregulated Power System Network and its Effect on Transmission Loss Allocation", Proceeding (on CDROM) of the 2001 IEEE Canadian Conference on Electrical and Computer Engineering, Toronto, Ontario, Canada, May 13-16 |

[6] | A. Bhuiya and N. Chowdhury, 1999. "Allocation of Transmission Losses in a Deregulated Power Network with Bilateral Contracts", Proceedings of the 1999 Large Engineering Systems Conference on Power Engineering, Halifax, Nova Scotia, Canada, June 20-22, 1999, pp. 220-229. |

[5] | S. Islam and N. Chowdhury, 1999. "Power System Restoration with the Help of a Case-based Expert System", Proceedings of the 1999 Large Engineering Systems Conference on Power Engineering, Halifax, Nova Scotia, Canada, June 20-22, pp. 115-123. |

[4] | A. Bhuiya and N. Chowdhury, 1999. "Allocation of Transmission Losses in a Deregulated Power System Network", Proceedings of the 1999 IEEE Canadian Conference on Electrical and Computer Engineering, Edmonton, Alberta, Canada, May 9-12, pp. 1148-1152. |

[3] | S. Islam and N. Chowdhury, 1999. "A Case-based Expert System for Power System Restoration", Proceedings of the 1999 IEEE Canadian Conference on Electrical and Computer Engineering, Edmonton, Alberta, Canada, May 9-12, pp. 1159-1163. |

[2] | N. Chowdhury and B. Zhou, 1998. "An intelligent Training Agent for Power System Restoration", Proceedings of the 1998 IEEE Canadian Conference, May 24-28, Waterloo, Canada, pp. 786-789. |

[1] | R. Gupta, N. Chowdhury, R. Billinton, L. Goel, 1998. "Evaluation of Avoided Operating Cost Utilizing a Probabilistic Technique", Proceedings of the Energy Management and Power Delivery 98 Conference, Singapore, March 3, pp. 73-78. |

#### Honours and Awards

"Economic Impact of Cogenerated Energy on a Power System", by R. Gupta, N. Chowdhury and R. Billinton has been selected as one of the nine best papers presented at the International Power Engineering Conference, May 22-24, 1997, Singapore.Graduate Students

#### Graduate Students

Ashikur R Bhuiya

Shah Md. Rezaul Haque

Ted Nivolianitis

#### Former Graduate Students

##### Ashikur Bhuiya

PhD., "A Study of Bilateral Contracts in a Deregulated Power System Network" January 2004.

##### Yong Zheng

M.Sc. "Transmission System Expansion Planning Under Deregulation", April 2003.

##### Ashikur Bhuiya

M.Sc.. "Allocation of Transmission Loss in Deregulated Power System Networks", August 1999.

##### Syed Islam

M.Sc. "Development of a Case-Based Training Simulator for Power System Restoration, August 1999.

##### Bixia Zhou

M.Sc. "A Case-Based Intelligent Training Agent for Power System Restoration", September 1997.

##### Rajnish Gupta

Ph.D. "Economic Impact of Non-Utility Generation on Electric Power Systems", April 1997.

##### Hamid Khonsari

M.Sc. "Adequacy Assessment at the HLI Using Modified Four-State Models" September 1994.

##### Syed Ahmad

M.Sc. "Probabilistic Assessment of Spinning Reserve in Interconnected Generation Systemsâ€, October 1992.

##### Rajnish Gupta

M.Sc. "Reliability Evaluation of Subtransmission Configurations in Electric Power Systems", August 1991.

Teaching

##### EE 216

Probability, Statistics and Numerical MethodsTabular and graphical representation of data, Probability, Random variables and discrete probability distributions, Continuous probability distributions, expectation, confidence interval, Testing of hypotheses, Method of least squares, Software packages for statistical analyses. Numerical Methods: Random numbers and random sampling, Interpolation and spline functions, Solutions of equations in one variable, solutions of systems of linear equations, Numerical differentiation and numerical integration, Solutions of differential equations, Fast Fourier Transform, Optimization.

http://www.engr.usask.ca/classes/EE/216/

##### EE 344

Power ElectronicsIntroduction to switching devices: volt-ampere characteristics of BJTs, thyristors, GTOs, IGBT and MOSFETS, switching losses. Average, rms and peak current and voltage ratings of power electronic devices. Commutation of power electronic devices; analyses of uncontrolled and controlled converter circuits, single-phase and three-phase AC-DC converters, DC drives. Principle of DC to DC conversion: analyses of boost and buck choppers. Principle of DC to AC conversion, application of inverters, analysis of inverter circuits, voltage control in inverter circuits, reduction of output harmonics in inverters. Snubber circuits. Emphasis will be placed, throughout the course, on the utilization of software application packages.

http://www.engr.usask.ca/classes/EE/344/

##### EE 840

Mathematical Methods in EngineeringIterative techniques for solving non-linear equations with one variable; techniques for solving sets of linear algebraic equations using direct and iterative methods; Iterative methods for solving non-linear algebraic equations; LU factorization and application of LU matrices; eigenvalues, eigenvectors and modal transformation, solving sets of first- and second-order differential equations; optimization techniques.

http://www.engr.usask.ca/classes/EE/840/

##### EE 867

Economic System OperationBasic concepts of economic system operation; determination of system transmission losses; development of transmission loss formulae co-ordination of incremental production costs and incremental transmission losses in composite hydro-thermal systems; economic load dispatch in thermal systems by dynamic programming; optimal economic operation of hydro-thermal systems; system operation in a deregulated environment; optimum coordination of active and reactive power and reserve in a deregulated system.

http://www.engr.usask.ca/classes/EE/867/

Research Projects

Transmission loss allocation in a deregulated power system.

Transmission expansion in a deregulated power system.