Voltage Collapse Detection in Iraqi Electrical Network Using Different Types of Indices

Voltage stability is anxious with the ability of a power system to protect worthy voltages at all buses in the framework under ordinary condition and in the wake of being liable to an unsettling influence. In this paper study and analyze the high voltage 400 kV in Iraqi electrical network. In order to identify the voltage collapse in Iraqi electrical network by using different types of indices, these indices provide reliable data about nearness of voltage instability in a PS. Two types of Indices used to analysis and detect the weakness bus voltage and weakness lines in the Iraqi electrical network, indices for detect weak buses such as: Power Transfer Stability Index (PTSI) and Voltage Collapse Predication Index (VCPI) and indices for detect weak lines such as: Fast Voltage Stability Index (FVSI), Line Stability Index (L_mn) and On Line Stability Index (LVSI). The effectiveness of these indexes is confirmed through 24 bus Iraqi networks under increased the load on each bus until reach to collapse point and then increased the load on QIM4 and AMR4 buses as well as consider the lines outage that was connected with these buses. From the simulation, the results clearly indicate and the performance of these indices is achieved and considered.