Abstract
To effectively guarantee a secure and stable operation of a smart substation, it is essential to develop a relay protection system considering the real-time online operation state evaluation and the risk assessment of that substation. In this paper, based on action data, defect data, and network message information of the system protection device (PD), a Markov model-based operation state evaluation method is firstly proposed for each device in the relay protection system (RPS). Then, the risk assessment of RPS in the smart substation is carried out by utilizing the risk transfer network. Finally, to highly verify the usefulness and the effectiveness of the proposed method, a case study of a typical 220 kV substation is provided. It follows from the case study that the developed method can achieve a better improvement for the maintenance plan of the smart substation.
Highlights
As the core part of a typical power grid, transmission and distribution substations play an important role in delivering high-quality power to the consumers and controlling the power flow
The risk assessment method of smart substation relay protection system (RPS) based on the Markov model and the risk transfer network was proposed
Defect data, and network message information of 220 kV and the proposed protection system, the failure rate of protection device (PD) based on the Markov model was evaluated, and the risk assessment for RPS of a smart substation was carried out by combining both the Markov model and the risk transfer network together
Summary
As the core part of a typical power grid, transmission and distribution substations play an important role in delivering high-quality power to the consumers and controlling the power flow. Only a few studies considering risk assessment for smart substation relay protection were found based on the Markov model and the risk transfer network, which are the main motivations of this research. Based on the above discussions, in order to overcome the addressed problems, by combining the Markov model and the risk transfer network together, a new risk assessment method for RPS of the smart substation is proposed. By combining the Markov model and the risk transfer network together, an effective risk assessment method is proposed for the smart substation’s RPS; The operation states and the risk losses of all the devices in the protection system are fully discussed by using the Markov model; The risk losses of the bus protection system, the main transformer protection system, and the line protection system are analyzed.
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