Aggregate Harmonic Load Models of Residential Customers. Part 2: Frequency-Domain Models

This paper is the second part of a two-part series on developing aggregate harmonic models of residential customers. Part 1 paper presents a general approach for the decomposition of load profiles into end-use load types, which are then converted into main load categories and sub-categories. Afterwards, main load (sub)categories are represented by generic component-based time-domain models (TDMs), which are in Part 1 paper used to build two aggregate component-based TDMs of residential customers. These two aggregate TDMs are in this paper used to derive two corresponding aggregate frequency domain models (FDMs), which are expressed in the form of coupled harmonic admittance matrices (HAMs). The results in this paper illustrate harmonic cancellation effects of aggregate FDMs as a function of the number of aggregated households and also provide a comparison of aggregate component-based TDMs and aggregate HAM-based FDMs for pure sinusoidal and typically distorted voltage supply conditions.