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Load Flow Model of the Philippine Power System Grid

Philips B. Ocang

Load flow is vital in the planning and operation of any power system grid. Load flow analysis determines primarily the magnitude and phase angle of voltage at each bus and the active and reactive power flowing in each transmission line. These data require numerous non-linear equations which often make power flow solution difficult. In an attempt to simplify the process of load flow analysis and generate data at real time, this study aims to develop a reduced load flow model of Philippine power system grid to fit into the maximum bus limit of Power World simulator software. Initially, the researcher reduced and simulated the Luzon, Visayas, and Mindanao power flow models. Comparison of system loss of the reduced models and the actual models determined the reliability of the former. F-test and student t-test at significance level ?=0.05 validated the results for Luzon and Visayas models while %Error was used in the Mindanao model. The three reduced models were interconnected via High Voltage Direct Current to constitute the unified load flow model of the Philippine power system grid. Load flow simulation of the unified model showed bus under-voltage problem. However, reactive volt- ampere compensation scheme and de-energization corrected the three-voltage problem in Visayas and one voltage problem in Mindanao, respectively. Eventually, the unified model passed the Philippine Grid Code. This model can provide power system engineers ease of data generation, address problems or add installations when the Philippine power system grid will be finally unified for full deregulation.

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