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The purpose of this paper is to describe a theoretical m o d e l f o r d e t e r m i n i n g i h e signal s t r e n g t h of communication signals on three phase power distribution lines.This model has bcen implemented in software. The model is used to compute voltage and current as functions of the distance from the signal source for several different power line configurations.The data so generated are compared with measurements.

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A new method of peak power tracking for photovoltaic arrays is presented. The method utilizes ripple inherent in the system to determine the correct operating point for maximum power from tha array.Peak power tracking is important for efficient operation of photovoltaic power systems.Operation of a microprocessor controlled 50KVA power conditioning unit utilizing the new peak power tracking method is described. The unit features automatic start up and parallel operation with the utility grid.