Toward User-Centered Bounded State Estimation for the Distribution System with Distributed Energy Resources

Distributed energy resources (DERs) have been widely integrated into the distribution system for energy conservation and environmental protection. A state estimation method with high accuracy and reliability is critical to ensure the secure operation of the distribution system with DERs. Due to the limited real-time measurements available, pseudo-measurements are typically used to improve redundancy in state estimation. However, pseudo-measurements with large errors may affect the accuracy of the estimation results. A user-centered bounded distribution system state estimation (UCB DSSE) model is developed based on operators’ requirements for real-time measurement residuals to guarantee the quality of the estimated solution. A dynamical system derived from the UCB DSSE model is employed to establish the theoretical foundation, while a theory-based state estimation method is developed with a robust computational mechanism. Numerical evaluations are conducted to demonstrate the performance of the theory-based state estimation method with promising results.