scholarly journals Design of a Microgrid with Low-Voltage Ride-Through Capability and Simulation Experiment

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Wenchao Fan ◽  
Zaijun Wu ◽  
Xiaobo Dou ◽  
Minqiang Hu ◽  
Jieru Wei ◽  
...  
Keyword(s):  
Low Voltage ◽  
Distribution Network ◽  
Fault Recovery ◽  
Voltage Distribution ◽  
Distribution Grid ◽  
Distributed Generations ◽  
Low Voltage Ride Through ◽  
Ground Fault ◽  
Islanded Mode ◽  
Network Fault

A microgrid with low-voltage ride-through capability is designed. The designed microgrid avoids operating in unplanned islanded mode during an asymmetric ground fault which occurs in the low voltage distribution network and supports fault recovery for distribution network. Furthermore, compared with the traditional microgrid topology, the proposed microgrid topology also saves a lot of power electronic devices. The simulation results with PSCAD/EMTDC show that the microgrid can keep the distributed generations and loads operate normally when an asymmetric ground fault occurs in the low voltage distribution grid. It can also increase the active power output according to the requirement of the distribution network to support the distribution network fault recovery.

Research of Fault Location in Low-Voltage Distribution Networks

2013 ◽  
Vol 340 ◽  
pp. 819-823
Author(s):  
Yu Jun Zhang ◽  
Jing Li
Keyword(s):  
Fault Location ◽  
Low Voltage ◽  
Short Circuit ◽  
Distribution Network ◽  
Distribution Networks ◽  
Structural Features ◽  
Voltage Distribution ◽  
Short Supply ◽  
Actual Distribution ◽  
Network Fault

The low-voltage distribution networks have some structural features, such as short supply line, more lines branch and influence of transition resistance of the short-circuit current. These characteristics seriously affect the development of fault location technology. The paper, based on the basis of the structural features about the low-voltage distribution networks, create the distribution networks of description matrix by knowledge of mathematical topology and use the distribution network fault location algorithm based on web-based structure matrix. By the algorithm, the area of fault judgment and the actual distribution network fault location are fully consistent. The new theory provides a new way of thinking for fault location in low-voltage distribution networks.

scholarly journals Analysis of Transient Voltage Stability in a Low Voltage Distribution Network Using SST for the Integration of Distributed Generations

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Sheng Li ◽  
Zhihao Zhou ◽  
Qiqi Shan ◽  
Jiani An
Keyword(s):  
Voltage Stability ◽  
Low Voltage ◽  
Short Circuit ◽  
Distribution Network ◽  
Voltage Distribution ◽  
Distributed Generations ◽  
Transient Voltage Stability ◽  
Dc Bus ◽  
Transient Voltage ◽  
Grid Side

Models of a low voltage distribution network using a typical tertiary-structure solid state transformer (SST) for the integration of distributed generations (DGs) and a conventional low voltage distribution network integrated with DGs were established to study the transient voltage stability issue, using the power system simulation software PSCAD. Effects on the transient voltage stability of the load bus and DC bus in the SST system are analyzed when grid-side cable line faults (such as short circuit and line disconnection) occur or the total output of DGs drops greatly. The results show that, comparing with the conventional system, the SST has apparent advantages on enhancing the transient voltage stability of load bus while facing different disturbances, even though SST has to regulate the voltage passively. Short circuit faults at different location of the grid-side line have different effects on the transient voltage stability, while the effect of disconnection fault is not related to fault location. Moreover, the DC bus voltage is easy to keep climbing continually when short circuit fault of the line occurs that is close to the SST input stage or disconnection fault occurs at any location of the line. If a battery energy storage station is installed, the transient voltage stability of DC bus and load bus will be improved effectively because of the regulation function of battery storage.

scholarly journals Research on Distribution Network Fault Recovery Reconfiguration Considering Distributed Generations

2021 ◽  
Vol 769 (4) ◽  
pp. 042011
Author(s):  
Wanlin Guan ◽  
Cong Chen ◽  
Tian Lan ◽  
Yanlong Liu ◽  
Shuang Rong ◽  
...  
Keyword(s):  
Distribution Network ◽  
Fault Recovery ◽  
Distributed Generations ◽  
Network Fault
Sign in / Sign up

Export Citation Format

Share Document