The aim of this research is to study the effect of HVDC transmission systems on reducing power losses and improving voltage profile. This paper presents a solution to the problems of an overloaded transmission line through selecting the optimal location for the HVDC system. For this purpose, a Genetic Algorithm (GA) uses to optimize the voltage profile, reduce power losses and handle power flow in overloaded transmission lines. MATLAB utilizes to engage both the GA and Newton Raphson method to solve the load flow problem. The proposed approach examined and tested on the IEEE Large Scale 57-bus test system. Power System Simulator for Engineering (PSS/E) package Version 32.0 is used as practical part to solve the functions of power system performance. The results demonstrated the ability of the proposed method to determine the optimum location of the HVDC line which reduces power loss and improves the “voltage profile” of the bus.
This research analyzes the level of the short circuit effect of the Iraqi super network and decides the suitable location for the High Voltage Direct Current (HVDC) connections in order to obtain the best short circuit reduction of the total currents of the buses in the network. The proposed method depends on choosing the transmission lines for Alternating current (AC) system that suffers from high Short Circuit Levels (SCLs) in order to reduce its impact on the transmission system and on the lines adjacent to it and this after replacing the alternating current (AC) line by direct current (DC) line. In this paper, Power System Simulator for Engineering (PSS/E) is used to model two types of HVDC lines in an effective region of Iraqi networks and to perform comparative studies to test the location of Short Circuit Levels (SCLs) between an actual AC and AC/DC case study in a portion of the Iraqi national network. The results proved the effectiveness of this method in eliminating severe faults and unwanted short currents, and the results showed that the bipolar type is better in reducing Short Circuit Levels of the Iraqi network.
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