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This paper is the second of a two-part series on analog-digital power system state estimation. The minimum-information-loss (MIL) method that calculates an accurate real-time power system model from a set of analog and digital measurements is implemented, applied, and validated. Two MIL implementations are proposed for both power grid and substation state estimation. The performance of the MIL method...
A substation three-phase nonlinear state estimation method based on KCL is presented. Measurements from different apparatus in substation are utilized, such as RTU and PMU three-phase data. Substation state estimation is established on three-phase breaker-oriented model using KCL, in which analog bad data and topology error identification can be decoupled, realizing real-time three-phase unbalanced...
The State Estimator function in a control center today is a suite of three programs solved sequentially: topology processing, state estimation, and bad data detection-identification. The state estimation equations are nonlinear because the inputs are mostly real and reactive power measurements. A linear state estimator is possible if the inputs are only complex currents and voltages and if there are...
In order to find hidden cascading outage caused by protective relays, methods for modeling, simulating and online setting-checking of protective relays are studied here. A user-defined model is proposed based on a kind of scrip language and concept of component firstly. Based on that, the power system simulator in a commercial dispatcher training simulator is embedded with protective relay simulator,...
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