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In recent years, there are several methods developed to compute the CBM. However, the methodologies do not consider the reliability of an interconnected system in the CBM determination. This paper presents the computation of CBM considering the reliability of an interconnected system. It is important to consider the reliability of an interconnected system in the CBM determination because the interconnected...
This paper presents a fast and accurate method to determine the available transfer capability. The Ralston's method is used to predict the two trajectory points of voltage magnitude, power flow and maximum generator rotor angle difference. Then, the cubic-spline interpolation technique is used to accurately trace the P-V, P-S or P- ?? ?? curves between two points of trajectory. The P-V, P-S and P-??...
This paper presents a constrained active power reschedule using immune system for static security enhancement. The study aims to evaluate the static security when a power transmission system is subjected to multi-contingencies. Voltage stability improvement is achieved by performing active power rescheduling in which the optimal value is determined using artificial immune system (AIS). The method...
Voltage collapse phenomenon is known to be complex and localized in nature but with a widespread effect. The ultimate effect of voltage collapse would be total system collapse which would incur high losses to utility companies. Thus, online monitoring of power system stability has become a vital factor for electric utility companies. One of the methods to avoid voltage collapse is to perform Under...
This paper presents evolutionary computing technique for solving constrained reactive power control (CRPC) problem in the attempt to enhance voltage stability under contingencies, while minimizing transmission loss and maintaining voltage level at an acceptable level. In this study, evolutionary programming (EP) was chosen as the evolutionary computing (EC) technique for solving the CRPC; taking into...
In the time of rapid growth, there is an increase of demand for a reliable and stable power supply. Power utilities are pressured to cater the rising demand with the existing system. Thus, monitoring the voltage stability of the system has become crucial. Under Voltage Load Shedding (UVLS) is one of the many methods that are used to sustain voltage stability. On the other hand, Fast Voltage Stability...
This paper presents the evolutionary neural network (ENN) model for the prediction of output from a grid-connected photovoltaic system installed at Malaysian Energy Centre (PTM), Bangi, Malaysia. The ENN model had been developed using evolutionary programming (EP) through the optimization of the number of nodes in the hidden layer, the learning rate and the momentum rate. The ENN model employs solar...
This paper presents the optimization of one-hidden layer artificial neural network (ANN) design using evolutionary programming (EP) for predicting the energy output of a grid-connected photovoltaic system installed at Malaysian Energy Centre (PTM), Bangi, Malaysia. In this study, the architecture and training parameters of the multi-layer feedforward back-propagation ANN model had been optimized while...
This paper proposed a fast and accurate computational method to determine the available transfer capability (ATC) in a power system. The methodology utilizes the curve fitting technique so-called as the cubic-spline interpolation technique that is incorporated into the Ralston's method in order to provide fast and accurate estimation of ATC. The Ralston's method is used to predict the two trajectory...
Optimal power flow (OPF) has been profoundly identified as one of the main issues in power system operation and planning. Solving the OPF problem is the fundamental aspect in the determination of electricity prices and congestion management. It involves a large dimension nonlinear, non-convex and highly constrained optimization problem which requires a reliable technique in order to provide global...
Malaysia has high lightning and thunderstorm occurrences throughout the year. A vast amount of its data have been recorded which allows various lightning-related studies to be conducted. This paper presents the application of artificial neural network (ANN) in predicting the occurrence of lightning events based on historical lightning and meteorological data. ANN, which was inspired by the way biological...
Power flow study has been identified as the most important issue in power systems especially in the field of assessing the power system operability, survivability and also its security. It is considered as the back bone prior to further power system analysis, operation and planning. There have been various ready made products for power flow study packages in the market. Nonetheless, any attempts to...
Continuous demand in power transmission network caused by reactive power has been highlighted as the main factor in voltage depreciation and also increase of total transmission loss. Various studies involving reactive power planning (RPP); such as optimal reactive power dispatch (ORPD), optimal capacitor placement, static VAR compensator and installation of flexible AC transmission system (FACTs)...
Several blackout occurrences in many part of the world had indicated the importance of voltage stability studies. These events could be caused by line or generator outages, stressed condition, change of loads and load shedding. The occurrence of voltage collapse is very much dependent upon the maximum permissible load that can be supported at a particular load bus. Any attempt to increase the load...
Ensuring a smooth electrical energy to the consumer has been identified as the main role of electric supply utility. In doing so, the power utility needs to ensure that the electrical power is generated with minimum cost. Hence, for economic operation of the system, the total demand must be appropriately shared among the generating units with an objective to minimize the total generation cost for...
System violation in a power system resulted from the spectacular voltage drop caused by the overloading condition has become a serious problem these days. This incident has occurred in the presence of voltage instability which has partly contributed to the monetary losses resulted from the failure transmission process. Limited operating margin in power operating system has also caused such system...
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