A Practical GERI-Based Method for Identifying Multiple Erroneous Parameters and Measurements Simultaneously

Ruipeng Guo, Lilan Dong, Hao Wu, Fangdi Hou and Chen Fang
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Ruipeng Guo: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Lilan Dong: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Hao Wu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Fangdi Hou: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Chen Fang: Electric Power Research Institute, State Grid Shanghai Municipal Electric Power Company, Shanghai 200437, China

Energies, 2021, vol. 14, issue 12, 1-21

Abstract: Even with modern smart metering systems, erroneous measurements of the real and reactive power in the power system are unavoidable. Multiple erroneous parameters and measurements may occur simultaneously in the state estimation of a bulk power system. This paper proposes a gross error reduction index (GERI)-based method as an additional module for existing state estimators in order to identify multiple erroneous parameters and measurements simultaneously. The measurements are acquired from a supervisory control and data acquisition system and mainly include voltage amplitudes, branch current amplitudes, active power flow, and reactive power flow. This method uses a structure consisting of nested two loops. First, gross errors and the GERI indexes are calculated in the inner loop. Second, the GERI indexes are compared and the maximum GERI in each inner loop is associated with the most suspicious parameter or measurement. Third, when the maximum GERI is less than a given threshold in the outer loop, its corresponding erroneous parameter or measurement is identified. Multiple measurement scans are also adopted in order to increase the redundancy of measurements and the observability of parameters. It should be noted that the proposed algorithm can be directly integrated into the Weighted Least Square estimator. Furthermore, using a faster simplified calculation technique with Givens rotations reduces the required computer memory and increases the computation speed. This method has been demonstrated in the IEEE 14-bus test system and several matpower cases. Due to its outstanding practical performance, it is now used at six provincial power control centers in the Eastern Grid of China.

Keywords: error identification; erroneous parameters and measurements; gross error reduction-index-based method; multiple measurement scans; power system state estimation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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