Results 21 to 30 of about 2,400,147 (293)
IEEE Open Journal of the Industrial Electronics Society, 2021 The growing relevance of voltage source converters (VSCs), and the deep impact they have on the development and maintenance of the electrical grid, increase the necessity of further research on how to deal with nonideal grid conditions from the VSCs ...
Pablo Montero-Robina +3 more
doaj +1 more source
A comparative study of methods for estimating virtual flux at the point of common coupling in grid connected voltage source converters with LCL filter [PDF]
, 2016 Grid connected Voltage Source Converters (VSCs) with LCL filters usually have voltage measurements at the filter capacitors, while it can be important to control the active or reactive power injection at the grid-side of the LCL filter, for instance at a
Candela García, José Ignacio +5 more
core +1 more source
International Transactions on Electrical Energy Systems, 2015 Summary This paper proposes an improved transient negative-sequence calculation formula for a large-capacity nuclear power generator system under unbalanced network conditions. Because of the disadvantages of traditional transient negative-sequence ratings, I2*2 t is concluded to be inadequate for rating the generator imbalance capability.
Bao-jun Ge +4 more
openaire +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 +2 more
core +1 more source
Synchronous power control of grid-connected power converters under asymmetrical grid fault [PDF]
, 2017 Control of grid-connected power converters is continuously developing to meet the grid codes, according to which the generation units should keep connected to the grid and further provide ancillary services, such as voltage and frequency support ...
Candela García, José Ignacio +3 more
core +2 more sources
Detection of Internal Faults in Transformers By Negative Sequence Current
SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology, 2013 Initially it is very difficult to find out internal fault in transformer. These internal fault are hazardous and causes overheating of transformer oil and winding, it consequences as insulation failure because of this uninterrupted power supply cannot be continued. It is more difficult to detect internal fault in small ratting transformer.
Satyam Prakash, Vivek Mishra
openaire +1 more source
MMC-SST input-level control strategy considering power quality optimization
电力工程技术, 2022 The surge of negative sequence component of current affects the waveform quality of grid side current and endangers the normal operation of the system when the three-phase voltage of solid state transformer (SST) in the distribution network is unbalanced
ZHAO Wei +3 more
doaj +1 more source
Revista EIA, 2019 This paper studied the use of a new stator current feature for detection of winding and cage bars faults in an induction motor, and presents the experimental validation of a detection and identification scheme using Support Vector Machines (SVM). This validation was performed in a test bed using 2 HP, 4 pole motors in which shorted winding and broken ...
Castillo, Silvia Oviedo +1 more
openaire +3 more sources
Energy Reports, 2023 During the fault of the wind power collection line of the MMC-HVDC system, the amplitude of the fault current may be limited due to the control of the converter, which leads to the severe limitation of traditional protection.
Peng Sun +5 more
doaj +1 more source
Improved protection system for phase faults on marine vessels based on ratio between negative-sequence and positive-sequence of the fault current [PDF]
, 2018 This paper presents a new method to protect the radial feeders on marine vessels. The proposed protection method is effective against Phase-Phase (PP) faults and is based on evaluation of the ratio between the negative-sequence and positive-sequence of ...
Bak, Claus +6 more
core +3 more sources