A novel time-domain method for measuring subsynchronous oscillation current

Jie Teng; Shaorong Wang

doi:10.1117/12.2640354

1 August 2022 A novel time-domain method for measuring subsynchronous oscillation current

Jie Teng, Shaorong Wang

Proceedings Volume 12257, 4th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2022); 122572R (2022) https://doi.org/10.1117/12.2640354
Event: 4th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2022), 2022, Guangzhou, China

Abstract

Subsynchronous oscillation (SSO) can severely threaten the safety and stability of power systems. To study the mechanism and reduce the harm of SSO, the measurement of SSO current is of great significance. However, SSO current is comprised of three components with extremely close frequencies, i.e., a power-frequency component, a subsynchronous component, and a supersynchronous component, which makes it difficult to separately measure the components’ accurate values. To address this issue, this paper provides a novel time-domain method for measuring SSO current. The proposed method contains two key parts: 1) a multi-stage transfer circuit (MTC) comprised of two cascaded stages, where the SSO current serves as the input signal; and 2) a smart SSO current measurement algorithm (SMA) to give the accurate values of the above components, depending on the signals output by the stages of the MTC. The SMA takes advantage of the transfer characteristics of the MTC and the symmetry of the sinusoid signal to calculate the component parameters, which successfully separates the components with the close frequencies. Also, the proposed method can be easily implemented. Moreover, simulation tests have been carried out, and the test results verify the effectiveness and accuracy of the proposed method.

Citation Download Citation

Jie Teng and Shaorong Wang "A novel time-domain method for measuring subsynchronous oscillation current", Proc. SPIE 12257, 4th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2022), 122572R (1 August 2022); https://doi.org/10.1117/12.2640354

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KEYWORDS

Digital signal processing

Error analysis

Capacitors

Fourier transforms

Resistors

Signal processing

Optimization (mathematics)

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