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Articles by H. Hizam
Total Records ( 3 ) for H. Hizam
  J. Jasni , N. Azis , H. Hizam , M.Z.A. Kadir , M.N. Mariun , S.B.M. Noor and S. Sobri
  This study has been initiated to improve the time taken by the CPF method and eliminate the convergence problem for the tested system by enforcing the General Minimal Residual (GMRES) method at the initial point at the start up, herewith referred as CPF-GMRES solver. Analyses have shown that this new algorithm not only reduced the computation time but also eliminated the convergence problem for the tested system.
  M.Z.A. Ab Kadir , W.F. Wan Ahmad , J. Jasni and H. Hizam
  This research focuses on the simulation of the effect of corona model on different conductors used in transmission line design when subjected to the lightning surge. The paper details the procedures used in modelling the corona, as well as the implementation in the PSCAD/EMTDC software for surge propagation studies. There are many models available range from a simple and fixed capacitance to the more complex voltage-dependent capacitance. The corona used for this study is modelled based on the approached relationships and the analyses were done by comparing the results with other models for different types of conductors. The travelling voltage is then measured at different point-of-interest (POI) and compared in terms of the steepness and magnitude for different conductors.
  M. Hedayati , N. Mariun , H. Hizam and S.M. Bashi
  Shunt FACTS devices are prevalent in industrial application of induction motors. These equipments are effective to compensate disturbances and increase motor speeding up. In this study an assessment study between two different shunt FACTS (SVC and STATCOM) installed on terminals of motor is done. A conventional PI controller is used to control the thyristor firing angle of SVC or phase angle of STATCOM. A pole placement method is applied to specify the perfect gain settings of the controllers. The results of simulations display that STATCOM has better response over SVC for improving dynamic behavior of induction motor under ideal supply conditions. Power quality problem that influence the dynamic behavior of induction motor, include non ideal conditions such as harmonics, interruptions, voltage unbalance and voltage sags. Whereas voltage sags is one of the main cause of disturbances in distribution systems, the performances of the induction motor under symmetrical and unsymmetrical voltage sags are investigated in this study. The results prove that STATCOM is more effectual than SVC for reduction of transients and refinement the voltage profile.
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