The purpose of this work is to develop an on-line measurement technique, which could be used iteratively to detect the presence of harmonic loads on the power system. This has to be achieved in an environment of non-sinusoidal voltage waveforms and variable frequency as is the case in practice. This is achieved by looking at the relative phase relationship between the voltage and current at each harmonic frequency. From this information, the average harmonic power flowing in the load circuit can be found out. If the load is injecting average power back to the source at harmonic frequencies, then it can be called a harmonic source. The method has been applied successfully to a variety of load data which have been collected experimentally.
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