A5085625973- HVDC Systems and Fault Protection
- Superconducting Materials and Applications
- High-Voltage Power Transmission Systems
- Physics of Superconductivity and Magnetism
- Non-Destructive Testing Techniques
- Superconductivity in MgB2 and Alloys
- Magnetic Field Sensors Techniques
- Power System Reliability and Maintenance
- Magnetic confinement fusion research
Huazhong University of Science and Technology
2019-2022
Superconducting cables or fault current limiters may encounter short-circuit currents during operation. When experiencing multiple overcurrent cycles, the critical degradation of yttrium barium copper oxide (YBCO) tapes occur. The performance YBCO under is a gradual process. It take dozens hundreds overheating pulses. To get better understanding this process, we explored change repeated overcurrent. A life characteristics test platform was established. electromagnetic tape 50 Hz sinusoidal...
As medium voltage dc-based (MVDC) technology is widely considered in the shipboard integrated power system (IPS), short fault protection of IPS urgent. This paper suggests resistive type superconducting current limiter (R-SFCL), flux-coupling SFCL (FC-SFCL), and a hybrid (H-SFCL) alleviate improve transient behaviors MVDC IPS. All these SFCLs are installed at DC line. When pole to occurs, inductive components play roles limiting. To evaluate choose one for system, theoretical analysis,...
This paper investigates the high frequency response of Mirnov probe based on a test platform, which is capable generating uniform AC magnetic field within range 1–300 kHz. The eddy current effect quantitatively reflected by phase shift ϕc and normalized amplitude δ measured between cases with without conducting plate located near probe. method compensates resonant in circuit hence reflects purely effect. increases decrease distance plate. With increase frequency, magnitude decreases to...
As medium voltage dc-based (MVDC) technology is widely considered in the shipboard power system (SPS), short fault protection of IPS urgent. Superconducting current limiter (SFCL) an efficient way to solve problems MVDC IPS. A hybrid type SFCL (H-SFCL) based on a non-quenching inductor and two resistors electromagnetic designed this study. The H-SFCL can limit with no quenching little heating. In study, mechanism mathematical model SPS bipolar analyzed. According limiting performance...
As a high-density and high-load system, ship DC system has the characteristics of short power supply line, low damping. When short-circuit fault occurs, it will cause serious damage direct current circuit breaker (DCCB) is required to cut off quickly. In our previous paper, hybrid-type superconducting limiter (H-SFCL) been proposed, which can help DCCB reliably remove faults realize fast reclosing. On this basis, H-SFCL selected applied in medium voltage (MVDC) system. not only limiting...
The medium voltage direct current (MVDC) is a promising direction of future shipboard power system (SPS). However, one the main limitations encountered in its development fault isolation DC side. This paper reveals evolution process short-circuit typical MVDC SPS through equivalent circuit and transient simulation. Based on analysis protection needs, superconducting current-limiting switch (SCLS) topology proposed, which includes coupled coil two breakers (DCCBs). models SCLS built...
The fault current limiting and breaking of the ship's direct (DC) side is key link its protection. On one hand, superconducting limiter (SFCL) has outstanding advantages compared with traditional current-limiting equipment. other SFCL can cooperate a DC circuit breaker (DCCB) to achieve reliable cutoff large currents. Therefore, in this paper, switch (SCLS) structure proposed performance analyzed ship MVDC power system.
Medium voltage direct current (MVdc) shipboard power system (SPS) is the development trend of future ships. With characteristics compact structure and high-power density, short circuit much more serious than a land-based system, which seriously restricts MVdc SPS. Therefore, there an urgent need for prospective research on fault protection. According to SPS, dc superconducting current-limiting switch (SCLS) proposed, so as realize limiting protection In this article, small-scale SCLS coil...