Results 31 to 40 of about 263,868 (190)

High-impedance faulty feeder detection for cross-country faults in distribution networks based on zero-sequence active power regulation

International Journal of Electrical Power & Energy Systems
The weak characteristics of high-impedance faults and the complex attributes of cross-country faults make faulty feeder detection of cross-country high-impedance faults difficult in medium-voltage networks. This paper deduces the zero-sequence equivalent
Yuting Lan, Kun Yu, Xiangjun Zeng, Rong Cai, Qingbo Deng, Chenyu Wu, Shigeng He, Shijie Xu, Youcheng Jia   +8 more
doaj   +1 more source

Investigation of negative sequence injection capability in H-bridge multilevel STATCOM [PDF]

, 2014
The aim of this paper is to investigate the ability of star- and delta-connected H-bridge multilevel STATCOMs to exchange negative-sequence current with the grid. Zero-sequence injection is utilized for capacitor voltage balancing.
Behrouzian, Ehsan, Bongiorno, Massimo, Zelaya, Hector   +2 more
core   +1 more source

Mathematical description of the method for ungrounded AC systems to determine the network insulation

IET Generation, Transmission & Distribution, 2022
For the safety of humans and animals in the vicinity of single‐phase earth faults in ungrounded AC systems, the development of methods for monitoring the condition of insulation and protection against electric shocks is an important issue.
Iskander Kurabayev, Ivan Suvorov, Arman Utegulov, Galina Tatkeyeva   +3 more
doaj   +1 more source

Impedance Modeling and Stability Analysis of Three-Phase Four-Leg Grid-Connected Inverter Considering Zero-Sequence

IEEE Access, 2021
With the increasing applications of grid-connected voltage source converters, it is important to analyze the impedance characteristic of the grid-connected system to implement the stability analysis of the grid connection operation.
Heng Nian, Yuming Liao, Meng Li, Dan Sun, Yunyang Xu, Bin Hu   +5 more
doaj   +1 more source

Simplified Cluster Voltage Balancing Control Based on Zero-Sequence Voltage Injection for Star-Connected Cascaded H-Bridge STATCOM

CSEE Journal of Power and Energy Systems
The cluster DC voltage balancing control adopting zero-sequence voltage injection is appropriate for the star-connected cascaded H-bridge STATCOM because no zero-sequence currents are generated in the three-phase three-wire system.
Kai Hu, Guoliang Zhao, Daorong Lu, Zhengang Lu, Nianwen Xiang, Shulai Wang, Jintian Lin   +6 more
doaj   +1 more source

A Novel Fault-Tolerant Control of Modular Multilevel Converter under Sub-Module Faults based on Phase Disposition PWM

Energies, 2018
Each arm of modular multilevel converter (MMC) consists of a large number of sub-module (SM) units. However, it also increases the probability of SM failure during the long-term system operation. Focusing on the fault-tolerant operation issue for the MMC
Yin Jingyuan, Wen Wu, Wei Tongzhen, Wu Xuezhi, Huo Qunhai   +4 more
doaj   +1 more source

FPGA-based implementation of the back-EMF symmetric-threshold-tracking sensorless commutation method for brushless DC-machines [PDF]

, 2013
The operation of brushless DC permanent-magnet machines requires information of the rotor position to steer the semiconductor switches of the power-supply module which is commonly referred to as Brushless Commutation. Different sensorless techniques have
Darba, Araz, De Belie, Frederik, Melkebeek, Jan, Salem Mohamed Salem, Aboubakr   +3 more
core   +1 more source

Compensation of Distribution System Voltage using DVR [PDF]

, 2002
A dynamic voltage restorer (DVR) is a power-electronic controller that can protect sensitive loads from disturbances in the supply system. In this paper, it is demonstrated that this device can tightly regulate the voltage at the load terminal against ...
Ghosh, Arindam, Ledwich, Gerard
core   +2 more sources

Phase-to-phase power balance control in flexible interconnection equipment by injecting zero sequence voltage

Xi'an Gongcheng Daxue xuebao
The multi terminal flexible interconnection equipment with cascaded full bridge and dual active bridge structure could connect AC power grid and multiple DC power grid, and instantaneous power differences in different DC power grids and sub module faults
WANG Bo, JI Ziyue, WANG Wanxing, XIAO Chaomin, ZHANG Yan   +4 more
doaj   +1 more source

Generalised Predictive Control of a 12-bus Network Using Neutral-Point Clamped Voltage Source Converter UPFC [PDF]

, 2014
The paper presents the application of a UPFC to a case study of a 12-bus high power network. The UPFC shunt converter employs 8 3-level Neutral Point Clamped (NPC) voltage source converters (VSC) and 12 single-phase three-winding phase shifting ...
Chong, BVP, Kokkinakis, M, Zhang, L
core   +1 more source