Waluyo, Waluyo and Kania, SAWITRI and HAMLAR, Fitrasari (2020) Comparative Computations on Supplied and Lost Energy utilizing Numerical Integrations. Electrotehnică, Electronică, Automatică (EEA), 68 (2). pp. 32-40. ISSN 1582-5175

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Abstract

A low voltage system is the closest line to consumers. There is lost power or energy, either technical or nontechnical losses. This research presented the electrical measurements, supplied and lost power and energy computations, modelling, and simulation. The measurements used a power analyser so that some electrical parameters could be measured and recorded simultaneously. The energy computations used the trapezoidal and Simpson’s composite rules based on power. While the modellings were made by using parabolic regressions due to the data patterns followed parabolic trends. Finally, the simulation results were redrawn based on the software. The losses were based on the distribution transformer and low voltage lines. The energy computation and power patterns of modelling were based on the numerical method, and the simulation was based on the measurements. The results showed that the highest supplied power was at 1:45 p.m. The high category of the supplied energy was on Tuesday, Wednesday, Thursday, and Monday. Meanwhile, the medium category was on Friday, and finally, the low category was on Saturday and Sunday. Both supplied and lost power modellings convex up. This case indicated that around midday’s, the consumed and lost powers were the highest. Thus, the quadratic constants are negative values. The highest consumed and lost energy were on Tuesday, as 1445.0 and 30.4 kWh (composite trapezoidal rule) and 1441.1 and 30.3 kWh (composite Simpson's rule), respectively. While the lowest consumed and lost energy were 594.1 and 23.3 kWh (composite trapezoidal rule) and 592.6 and 23.2 kWh (composite Simpson's rule), respectively, on Sunday. The power and energy losses ranged from 1.74 % to 3.66 % and 2.08 % to 3.92 %, respectively. The deviations between the composite trapezoidal and Simpson's rule methods for both supplied and loss energy were 0.27 % and 0.30 %, respectively. Keywords: Composite trapezoidal, energy, losses, modelling, Simpson’s

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