Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 37, Issue 5, Pages 5320-5332Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3133843
Keywords
Inverters; Circuit faults; Hysteresis; Limiting; Circuit breakers; Harmonic analysis; Short-circuit currents; Current limiting; short-circuit fault; single-phase inverter; third harmonic
Categories
Funding
- National Natural Science Foundation of China [51977091]
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The fast short-circuit fault ride-through capability of the inverter is crucial for the reliability of an independent power supply system. This study proposes a short-circuit fault diagnosis strategy and a current-limiting control strategy to achieve fast short-circuit protection.
The fast short-circuit fault ride-through capability of the inverter is an important indicator for the reliability of an independent power supply system. Fast short-circuit fault ride-through requires the inverter to output the short-circuit fault current quickly and reliably, which is conducive to shortening the duration of short-circuit faults and realizing fast short-circuit protection. In addition, when the single-phase inverter outputs a short-circuit fault current, the third harmonic in the short-circuit current may cause malfunction of the protection circuit. To effectively achieve the fast short-circuit current limiting and third harmonic suppression of the single-phase inverter, this article proposes a short-circuit fault diagnosis strategy and a current-limiting control strategy, respectively. The former is a short-circuit fault diagnosis strategy, and the latter is a fast current limiting control strategy based on adaptive reference feedforward and third harmonic elimination. The proposed strategies can enable the single-phase inverter to reach a current-limiting steady state within a fundamental period, which can greatly improve the response speed of single-phase inverters and achieve fast short-circuit protection. They can also be applied to three-phase inverters. A 35-kVA/50-Hz high-power single-phase inverter prototype is built to verify the effectiveness of the proposed method.
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