Online open‑circuit fault diagnosis strategy for three‑level distribution static synchronous compensator

Ke Wang

Online open‑circuit fault diagnosis strategy for three‑level distribution static synchronous compensator

Ke Wang

Vol. 25, No. 9, pp. 1761-1770, Sep. 2025

10.1007/s43236-025-01145-8

Abstract

The open-circuit (OC) fault diagnosis of power switching devices is crucial for improving equipment reliability. Although existing literature has proposed many effective methods, no study has yet investigated how to estimate and quantify the real-time effect of different device OC faults on a system nor how to optimize existing diagnostic methods using the results of quantifying risks. Therefore, an improved online OC fault diagnosis strategy is proposed for the three-level four-wire distribution static synchronous compensator. The effect of the potential OC fault is quantified online innovatively, and the OC risk assessment coefficient for each switching device is introduced by counting the number of potentially affected space vectors in the CPLD or FPGA. The obtained risk assessment coefficient is then used to adjust the weight of the fault location decision function, aiming to enhance positioning accuracy and anti-interference capability during load mutations. The key advantage of this strategy lies in its strong portability, as it can serve as an optimization strategy for various other OC fault location methods. However, its main limitation is the requirement for high-speed computing hardware, such as FPGA or CPLD. The feasibility of this strategy is validated through simulation and experimental results.

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Cite this article

[IEEE Style]

K. Wang, "Online open‑circuit fault diagnosis strategy for three‑level distribution static synchronous compensator," Journal of Power Electronics, vol. 25, no. 9, pp. 1761-1770, 2025. DOI: 10.1007/s43236-025-01145-8.

[ACM Style]

Ke Wang. 2025. Online open‑circuit fault diagnosis strategy for three‑level distribution static synchronous compensator. Journal of Power Electronics, 25, 9, (2025), 1761-1770. DOI: 10.1007/s43236-025-01145-8.