Component-Based Dynamic Load Modeling of a Paper Mill

Load modelling has always been a key missing part in power system analysis especially in transient stability studies. In the Tasmanian power system, about half the load demand comes from industrial loads and some comprise large rotating machines. Therefore, modelling of these loads has to consider their behaviour during disturbances. This paper looks to develop a mathematical load response model for a paper mill connected to the power system. The developed model is based on component-based load modelling approach. A PSCAD model of the paper mill is constructed from available information on the types of loads within the mill. Simulations are then run to study its responses to disturbances. The load model is developed for both voltage and frequency changes but each of them is considered separately. Both voltage and frequency disturbances are then applied during simulations of the paper mill to investigate the combined effect of voltage and frequency disturbances. With this model, the source of each transient response can be easily identified, which can be useful for future mitigation work to avoid system instability issues.