“…Load models are categorized into static and dynamic models, and various load model structures can be derived from these models [27]. There are various load models in the literature [28]- [31]; however, this paper selects the time-varying ZIP load model, based on a comprehensive initial study by the authors, as the most relevant to create the benchmark system. A constrained and bounded Sequential Least-Squares Quadratic Programming (SLSQP) method is proposed in this paper to estimate model parameters.…”