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The composite load model (CLM) proposed by the Western ElectricityCoordinating Council (WECC) is gaining increasing traction in industry,particularly in North America. At the same time, it has been recognized thatfurther improvements in structure, initialization and aggregation methods areneeded to enhance model accuracy. However, the lack of an open-sourceimplementation of the WECC CLM has become a roadblock for many researchers forfurther improvement. To bridge this gap, this paper presents the first openreference implementation of the WECC CLM. Individual load components and theCLM are first developed and tested in Matlab, then translated to the highperformance computing (HPC) based, parallel simulation framework - GridPACK.The main contributions of the paper include: 1) presenting important yetundocumented details of modeling and initializing the CLM, particularly for aparallel simulation frame-work like GridPACK; 2) implementation details of theload components such as the single-phase air conditioner motor; 3) implementingthe CLM in a modular and extensible manner. The implementation has been testedat both the component as well as system levels and benchmarked againstcommercial simulation programs, with satisfactory accuracy.

A Reference Implementation of WECC Composite Load Model in Matlab and GridPACK