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Although much of today's power system remains steady, the integrations of wind power make a portion of the system become fluctuant. To monitor these fluctuations, we need to utilize phasor measurements and shorten the time interval for state estimation. On the other hand, however, this means huge increase in computation burden. As a tradeoff between accuracy and computation efficiency, a multi-time...
A distribution management system based on loop analysis method is presented in this paper. Firstly, the configuration of the newly developed DMS system is introduced which accommodates DERs. The realization methods of key functions are presented include state estimation, power flow analysis, network optimization, network restoration and reconfiguration, which are based on loop analysis method. An...
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 availability of synchro-phasor data has raised the possibility of a linear state estimator if the inputs are only complex currents and voltages and if there are enough such measurements to meet observability and redundancy requirements. Moreover, the new digital substations can perform some of the computation at the substation itself resulting in a more accurate two-level state estimator. The...
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...
The mathematical base of state estimation (SE) method for power systems is studied based on information theory. A more general SE method based on the minimum information loss (MIL) principle is proposed. The new method is suitable for different probability distributions of measurement errors, it can utilize different types of information including that of analog and digital measurements, and a unified...
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