Results 21 to 30 of about 2,384,002 (300)
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
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 +2 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
Fault Analysis Method Considering Dual-Sequence Current Control of VSCs under Unbalanced Faults [PDF]
, 2018 Voltage source converters (VSCs) are able to provide both positive- and negative-sequence short circuit currents under unbalanced faults. Their short circuit responses can be significantly different from those of conventional synchronous generators. This
Jia, Jundi +2 more
core +2 more sources
Positive and Negative Sequence Control Strategies to Maximize the Voltage Support in Resistive-Inductive Grids During Grid Faults [PDF]
, 2017 Grid faults are one of the most severe perturbations in power systems. During these extreme disturbances, the reliability of the grid is compromised and the risk of a power outage is increased.
Camacho Santiago, Antonio +4 more
core +2 more sources
Journal of Modern Power Systems and Clean Energy, 2022 The doubly-fed induction generator (DFIG) is considered to provide a low-reactance path in the negative-sequence system and naturally comply with requirements on the negative-sequence reactive current in emerging grid codes.
Yuanzhu Chang +5 more
doaj +1 more source
Double-Frame Current Control with a Multivariable PI Controller and Power Compensation forWeak Unbalanced Networks [PDF]
, 2016 The handling of weak networks with asymmetric loads and disturbances implies the accurate handling of the second-harmonic component that appears in an unbalanced network.
Rufery, Alfred, Siemaszko, Daniel
core +3 more sources
A timely switch fault ride-through method for VSC-HVDC system
电力工程技术, 2022 In order to achieve the fault through of voltage source converter-based high voltage direct current (VSC-HVDC)system during alternating current (AC) system asymmetric faults and keep stability of the impedance at steadystate, a timely switch fault ...
WANG Ke +5 more
doaj +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
Turn-to-turn fault detection in transformers using negative sequence currents [PDF]
2011 IEEE Electrical Power and Energy Conference, 2011 This paper presents a new, simple and efficient protection technique which is based on negative sequence currents. Using this protection technique, it is possible to detect minor internal turn-to-turn faults in power transformers. Also, it can differentiate between internal and external faults.
Mariya Babiy +2 more
openaire +1 more source