204 citations · 1.1k across the 39 of their papers we have counts for
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Optimal Placement of Dynamic Var Sources by Using Empirical Controllability Covariance
Junjian Qi, Weihong Huang, Kai Sun +1
In this paper, the empirical controllability covariance (ECC), which is calculated around the considered operating condition of a power system, is applied to quantify the degree of…
Dynamic State Estimation for Multi-Machine Power System by Unscented Kalman Filter with Enhanced Numerical Stability
Junjian Qi, Kai Sun, Jianhui Wang +1
In this paper, in order to enhance the numerical stability of the unscented Kalman filter (UKF) used for power system dynamic state estimation, a new UKF with guaranteed positive s…
Adaptive Optimal PMU Placement Based on Empirical Observability Gramian
Junjian Qi, Kai Sun, Wei Kang
In this paper, we compare four measures of the empirical observability gramian, including the determinant, the trace, the minimum eigenvalue, and the condition number, which can be…
Optimal PMU Placement for Power System Dynamic State Estimation by Using Empirical Observability Gramian
Junjian Qi, Kai Sun, Wei Kang
In this paper the empirical observability Gramian calculated around the operating region of a power system is used to quantify the degree of observability of the system states unde…