Research Article
Optimized Power System Voltage Measurements Considering Power System Harmonic Effects
@INPROCEEDINGS{10.1007/978-3-030-73585-2_10, author={Chukwuemeka Obikwelu and Sakis Meliopoulos}, title={Optimized Power System Voltage Measurements Considering Power System Harmonic Effects}, proceedings={Sustainable Energy for Smart Cities. Second EAI International Conference, SESC 2020, Viana do Castelo, Portugal, December 4, 2020, Proceedings}, proceedings_a={SESC}, year={2021}, month={4}, keywords={VT DFT DSE Optimization}, doi={10.1007/978-3-030-73585-2_10} }- Chukwuemeka Obikwelu
Sakis Meliopoulos
Year: 2021
Optimized Power System Voltage Measurements Considering Power System Harmonic Effects
SESC
Springer
DOI: 10.1007/978-3-030-73585-2_10
Abstract
The paper presents a real-time error correction method that accurately estimates the primary quantity of an inductive instrument transformer – that is, a voltage or current transformer – based on a Dynamic-State-Estimation (DSE) optimization approach.
The DSE error-correction method uses a high-fidelity model of the voltage transformer (VT) instrumentation channel (IC) and the Unconstrained-Weighted-Least-Squares (UWLS) optimization approach to accurately estimate the VT primary voltage; thus, correcting for errors generated in the instrumentation channel. Specifically, the method involves obtaining discretized measurements of the VT load voltage through a continuous monitoring process. The VT primary voltage is then continuously estimated by the method based on fitting the continuously obtained measurement samples to the high-fidelity VT model. The continuously estimated primary voltage can then be made readily available for metering, protection, and control functions. The method can be implemented using microprocessor technology, for example, in Merging Unit (MU) applications for digital power substation architectures.
The paper will focus on evaluating the performance of the DSE-based error-correction method, applied to inductive voltage transformer instrumentation channel (VTIC) applications, in the estimation of primary voltage signals distorted by harmonics. The evaluation process will employ multiple Fourier analysis techniques.
