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Appl. Sci. 2018, 8(9), 1527; https://doi.org/10.3390/app8091527

A Hybrid State Estimator Based on SCADA and PMU Measurements for Medium Voltage Distribution System

1
Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China
2
Electric Power Research Institute of China Southern Power Grid, Guangzhou 510080, China
*
Author to whom correspondence should be addressed.
Received: 25 July 2018 / Revised: 12 August 2018 / Accepted: 17 August 2018 / Published: 1 September 2018
(This article belongs to the Special Issue Distribution Power Systems)
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Abstract

With the increasing importance of renewable energy and flexible loads, the operation of the distribution system is becoming more stochastic and complex, and it is necessary to monitor the power system in real-time. Considering the gradual applications of intelligent electronic devices in the distribution systems, a hybrid state estimator based on supervisory control and data acquisition (SCADA) and phasor measurement unit (PMU) measurements is proposed in this paper, which consists of the improved robust estimation and linear state estimation. At the time of SCADA data acquisition, the improved robust estimation combining the SCADA measurements with PMU measurements is performed. To eliminate the effect of bad data, the internal student residual method is introduced, and the robust thresholds are adjusted adaptively. Then the linear state estimation is performed at the time of PMU data acquisition based on the results of the previous estimation time and the PMU measurements, which can quickly correct the robust estimation results and track the changes of the distribution system. Finally, the effectiveness and performance of the proposed method are verified in a modified IEEE 33-bus distribution system and a real distribution system in China. View Full-Text
Keywords: distribution system state estimation; phasor measurement units (PMUs); improved robust estimation; fast state tracking distribution system state estimation; phasor measurement units (PMUs); improved robust estimation; fast state tracking
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Kong, X.; Chen, Y.; Xu, T.; Wang, C.; Yong, C.; Li, P.; Yu, L. A Hybrid State Estimator Based on SCADA and PMU Measurements for Medium Voltage Distribution System. Appl. Sci. 2018, 8, 1527.

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