Short-Circuit Current Analysis of Grid-Connected Distributed Photovoltaic Generation

The modular multilevel converter (MMC) has been widely adopted in high voltage direct current (HVDC) transmission systems due to its significant advantages. MMC-HVDC is developing towards multi-terminal direct current (MTDC) power grid for reliability enhancement. However, there exist a huge amplitude and a steep rise in fault current due to the low impedances of DC lines and MMCs, which threaten the security and reliability of the DC power grids. It is necessary to restrain the DC short circuit current in order to ensure the safe and stable operation of DC power grids. This paper gives a comprehensive review and evaluation of the proposed DC short-circuit current analysis and suppression techniques used in MMC-based MTDC power girds, in terms of MMC modeling, short circuit calculation, and suppression method. In addition, future trends of countermeasures to short circuit current in MMC-based MTDC power grids are also discussed.

Download Full-text

Impact of leakage and short circuit current in rush current analysis of power gated domains

Proceedings of the IEEE SoutheastCon 2010 (SoutheastCon) ◽

10.1109/secon.2010.5453925 ◽

2010 ◽

Cited By ~ 1

Author(s):

V Sreekumar ◽

S Ravichandran

Keyword(s):

Short Circuit ◽

Short Circuit Current ◽

Current Analysis

Download Full-text

Photovoltaic Generation of Electricity Using Near-Field Radiation

ASME/JSME 2011 8th Thermal Engineering Joint Conference ◽

10.1115/ajtec2011-44513 ◽

2011 ◽

Cited By ~ 3

Author(s):

Katsunori Hanamura ◽

Hirofumi Fukai ◽

Elaiyaraju Srinivasan ◽

Masao Asano ◽

Teppei Masuhara

Keyword(s):

Evanescent Wave ◽

Short Circuit ◽

Near Field ◽

Short Circuit Current ◽

Photovoltaic Cell ◽

Short Circuit Current Density ◽

Wave Radiation ◽

Wave Effect ◽

Photovoltaic Generation ◽

Field Radiation

Near-field radiation that has a high intensity of electric field was applied to enhance conversion from thermal energy to electricity in a wavelength range less than 1.1 μm or 1.8 μm. A commercial Si-photovoltaic cell and a thermophotovoltaic cell made of GaSb semiconductors were used to confirm that the near-field radiation effect (the evanescent wave effect) can be applied to enhance generation of electricity. As a result, an increase in output power generation of electricity by the evanescent wave effect was detected and the short-circuit current density increased about 1.3 times for the Si-PV cell and 3.0 times for the GaSb-TPV cell as larger than those obtained by the conventional propagating-wave radiation.

Download Full-text

Analysis of Characteristics Over Current Relay and Ground Fault Relay on Feeder Rayon Tabing

MATEC Web of Conferences ◽

10.1051/matecconf/201824802006 ◽

2018 ◽

Vol 248 ◽

pp. 02006

Author(s):

Arzul ◽

Ija Darmana ◽

Erliwati ◽

Adiv Rama Salvayer ◽

Tris Safri Yetno

Keyword(s):

Electric Power ◽

Power Distribution ◽

Short Circuit ◽

Relay Protection ◽

Short Circuit Current ◽

Phase 2 ◽

Current Analysis ◽

Protection Relay ◽

Ground Fault ◽

Overcurrent Relays

The reliability of power distribution of PT PLN (Persero) branch of Padang especially in Rayon Tabing most of the repeaters is still not optimal. This is due to an uncoordinated protection relay on each feeder. One effort made to improve the reliability of electric power is to rearrange the protection of overcurrent relays and ground disturbance relays on the feeder. So coordinated with each other well and is expected if there is interference in one of the repeater will not bring black out on other repeater. In this research we analyzed short circuit current at 20 kV side. From the analysis results obtained new relay protection settings based on the calculation of short-circuit current settings and compare the results with existing protection relays. By making efforts to improve the reliability of electric power is to rearrange the protection relay on each feeder. Based on short circuit current analysis on each repeater, the largest short circuit in 3 phase, 2 phase, and 1 phase disturbance is located at 1% disturbance location and the smallest disturbance is at 100% disturbance location. It can be concluded that the farther the location of the disturbance that occurs the smaller the disturbance, and vice versa, if the location of the disturbance that occurs closer then the greater the noise flow.

Download Full-text