Abstract
This paper proposes the development of a three-phase state estimation algorithm, which ensures complete observability for the electric network and a low investment cost for application in typical electric power distribution systems, which usually exhibit low levels of supervision facilities and measurement redundancy. Using the customers´ energy bills to calculate average demands, a three-phase load flow algorithm is run to generate pseudo-measurements of voltage magnitudes, active and reactive power injections, as well as current injections which are used to ensure the electrical network is full-observable, even with measurements available at only one point, the substation-feeder coupling point. The estimation process begins with a load flow solution for the customers´ average demand and uses an adjustment mechanism to track the real-time operating state to calculate the pseudo-measurements successively. Besides estimating the real-time operation state the proposed methodology also generates nontechnical losses estimation for each operation state. The effectiveness of the state estimation procedure is demonstrated by simulation results obtained for the IEEE 13-bus test network and for a real urban feeder.
Highlights
State estimator programs have been utilized by power system operators to remotely monitor electrical transmission systems in real time to verify whether network voltages are in compliance with national regulatory agency requirements, and, are operating under secure conditions.In general, these transmission systems present some features that facilitate the estimation process such as fully-automated grids, meshed-grid topology, redundant sets of measurements and balanced operations
This paper presents a methodology to estimate the state variables of electric distribution systems based on the three-phase version of the weighted least squares (WLS) conventional state estimation method, and on the proposed pseudo-measurement generation algorithm obtained from the consumers’ electric bills
The current paper proposed a three-phase state estimation methodology capable of efficiently
Summary
State estimator programs have been utilized by power system operators to remotely monitor electrical transmission systems in real time to verify whether network voltages are in compliance with national regulatory agency requirements, and, are operating under secure conditions. Though this methodology is capable of estimating the voltage phasors of a distribution grid with few measurements, the utilization factor might damage the state estimation performance if it is not correctly determined In this context, this paper presents a methodology to estimate the state variables of electric distribution systems based on the three-phase version of the WLS conventional state estimation method, and on the proposed pseudo-measurement generation algorithm obtained from the consumers’ electric bills. This paper presents a methodology to estimate the state variables of electric distribution systems based on the three-phase version of the WLS conventional state estimation method, and on the proposed pseudo-measurement generation algorithm obtained from the consumers’ electric bills This approach is able to efficiently estimate the electric distribution system operation state even considering the case when measurements records are available only at the distribution substation.
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