On Operational State Model Of Appliances And Its Applications

The user-side energy management system plays an important role in electrical safety,energy efficiency assessment,load identification,electricity usage optimization,and other applications.To realize these functions,it is necessary to study the characteristics of electrical appliances.The key lies in whether it is possible to construct a reasonable electrical appliance model to describe their operating characteristics and effects of user behavior.This paper proposed an operational state model of electrical appliances.First,the concepts of transient and steady state are introduced,and the power component of an appliance’ state is divided into two parts: the trend and the noise,which are modeled separately.The reasons of state transition are studied,which are appliance’s internal operation mode and the influence of external users.The state transitions are divided into the in-type and the out-type.A Transition matrix is defined and two different methods are used to describe them.Based on the proposed state model,the method for model parameters extraction using appliances’ historical data is studied.For appliances with fixed states transition modes and appliances with multiple functions integrated,special treatments are applied to their models,which are state chain and appliance dimension reduction,respectively.A dishwasher and a refrigerator are used as examples.Based on the complete state model,the methods for applications in user-side energy management are proposed.The combination of power selection and power deviation estimation is used to identify the appliances’ state.The abnormality detection criteria are used to diagnose the appliances’ malfunctions.Based on the highly expressive ability of the model,a data compression and decompression algorithm and a power simulation method are proposed.Super states are constructed using appliances’ models and non-intrusive load identification is performed through super state prediction and maximum probability likelihood.This article established general state models for eight electrical appliances in households.Based on these models,example analyses of the model applications are performed.The results show that the general state model proposed in this paper can reasonably reflect the appliances’ operation and user behavior.The model as well as the application methods performs well in terms of state recognition,abnormal diagnosis,operational data compression,operational simulation,and non-intrusive load decomposition.