The Ph.D. student Ms. Zainab Nadhim Abbas was examined in the contents of the thesis entitled:
“Studying the Merits of Employing High Voltage Direct Current Transmission System in Iraq”
which she prepared in the Department of Electrical Engineering/College of Engineering/Baghdad University in partial fulfillment of the requirements for the degree of Ph.D. in Electrical Engineering under the supervision of Prof. Firas Mohammad Tuaimah, Ph.D. on Thursday 10-3-2022.The examining committee consisted of Prof., Dhary Yousif Mahmood, Ph.D. (Chairperson of the Examining Committee), Prof. Ali AbdulRazaq Abbas, Ph.D., and Asst. Prof. Qasim AbdulRazaq Ali,Ph.D. , Asst. Prof. Dheya Jassim Kazem, Ph.D. and Asst. Prof. Hanan Michael Dawod (Members of the Examining Committee).
The abstract of the student’s thesis is as follows:
After 2003, Iraq witnessed a great openness to the world, which in turn led to keeping pace with development in various fields, especially in the field of electric power. Therefore, electrical systems need to develop to improve the performance of the Iraqi grid system as a result of energy consumption in various fields, including industrial, economic … etc. in addition to population growth. For all these reasons, radical solutions need to be developed for electrical energy in the most cost-effective way and with the least possible losses. Therefore, this research studied the merging of a High-Voltage Direct Current (HVDC) system to Iraqi grid 400 kV; this is one of the important ways to improve and transfer electric power from areas with high generation to areas which suffer from electrical problems.
There are two types of HVDC: the current source convertor (CSC) and the voltage source convertor (VSC). The VSC was used in this thesis because of its unique advantages.
In this thesis, two benefits were developed due to merging the HVDC system to Iraqi grid 400kV. The first benefit is an analysis and a study of the effect of the short circuit level (SCL) on Iraqi super grid and the determination of the appropriate location of the high voltage direct current (HVDC) line to obtain the best short circuit reduction. The second benefit of the analysis and the study of the impact of the HVDC line presented an improvement of and an increase in the transmission capacity of Iraqi 400 kV network.
The MATLAB program was used to run both the GA algorithm and Newton-Raphson method to solve the load flow of the system by applying the proposed algorithm to the IEEE-30 bus, -57 bus tests system and Iraqi grid 400 kV systems as a theoretical part, which has been validated in practice using Power Systems Engineering (PSS/E) for the above systems.
The results were promising and efficient in choosing the right place for installing converter stations in Rumaila Investment Power Station (RUMLIPP), the Baghdad South Gas Station (BGS4) and the Mosul Water Dam Station (MMDH), where the results showed an effective improvement in the voltage level and a reduction in the total losses of the network and an increase in the capacity of transmitting large amounts of energy over long distances.
The results showed that there is a good enhancement in power flow from the loaded transmission lines, active and reactive power loss and load capacity when HVDC transmission line are combined on the test systems and Iraqi grid 400 kV system.
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