365 citations · 1.3k across the 23 of their papers we have counts for
6 papers · 1 filter
An SQP Method Combined with Gradient Sampling for Small-Signal Stability Constrained OPF
Peijie Li, Junjian Qi, Jianhui Wang +3
Small-Signal Stability Constrained Optimal Power Flow (SSSC-OPF) can provide additional stability measures and control strategies to guarantee the system to be small-signal stable.…
Nonlinear Model Reduction in Power Systems by Balancing of Empirical Controllability and Observability Covariances
Junjian Qi, Jianhui Wang, Hui Liu +1
In this paper, nonlinear model reduction for power systems is performed by the balancing of empirical controllability and observability covariances that are calculated around the o…
EV Dispatch Control for Supplementary Frequency Regulation Considering the Expectation of EV Owners
Hui Liu, Junjian Qi, Jianhui Wang +3
Electric Vehicles (EVs) are promising to provide frequency regulation services due to their fast regulating characteristics. However, when EVs participate in Supplementary Frequenc…
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…
Comparing Kalman Filters and Observers for Power System Dynamic State Estimation with Model Uncertainty and Malicious Cyber Attacks
Junjian Qi, Ahmad F. Taha, Jianhui Wang
Kalman filters and observers are two main classes of dynamic state estimation (DSE) routines. Power system DSE has been implemented by various Kalman filters, such as the extended…
Interval Estimation for Conditional Failure Rates of Transmission Lines with Limited Samples
Ming Yang, Jianhui Wang, Haoran Diao +2
The estimation of the conditional failure rate (CFR) of an overhead transmission line (OTL) is essential for power system operational reliability assessment. It is hard to predict…