To effectively evaluate the impact of harmonics generated by the operation of large quantities of nonlinear residential loads on the power quality of low-voltage residential distribution networks

this paper proposes a residential harmonic source load model based on load equivalent impedance parameters. First

to tackle the problem of abnormal values frequently observed when determining the equivalent impedance parameters for single-phase residential loads

a refined approach is suggested. This involves the creation of a virtual three-phase symmetrical system through the application of the time-delay method. Then

the parameters of virtual zero-sequence current are introduced to reflect the harmonic effects within the three-phase system developed through the time-delay method

thereby ensuring that the load model parameters more precisely represent the nonlinear characteristics of harmonic source loads. Subsequently

a single-phase harmonic source load model is established to evaluate the harmonic source load current. Finally

to address the issue that the model fails to represent the dynamic harmonic characteristics of harmonic source loads across various states

a strategy for updating load model parameters is introduced

allowing the model to effectively monitor the dynamic variations in the harmonic characteristics of the load. The viability of the model for both single harmonic source loads and residential loads with various types of harmonic sources is confirmed through empirical measurement data from residential loads. The findings indicate that the proposed model is exceptionally adaptable and precise

providing a dependable reference for the harmonic analysis of residential loads.