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Harmonic Analysis of 230 V AC Power Supply Using LPC2138 Microcontroller

The presence of harmonics in power system is a major concern to power engineers for many years. With the increasing usage of nonlinear loads in power systems, the harmonic pollution becomes more serious. One of the widely used computation algorithm for harmonic analysis is Fast Fourier Transform (FFT). In this project, a harmonic analyzer using FFT is being implemented on ARM7 core processor LPC2138 [1]. The supply voltage of 230V, 50 Hz is stepped down to 6V using a voltage divider in order to match the power rating of the processor input. The output from the processor is displayed on a graphic LCD, which is interfaced to the output ports of the processor.