Conditioned emergence: a dissipative structures approach to transformation [PDF]
, 1999 This paper presents a novel framework for the management of organisational transformation, defined here as a relatively rapid transition from one archetype to another.
Aaker +72 more
core +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
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
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
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
Research on Life Loss of Generator Retainer Caused by Negative Sequence Current [PDF]
Journal of Physics: Conference Series, 2021 Abstract With a large number of wind and solar power sources connected to the power grid, higher requirements are put forward for the power generation equipment to respond to the power grid imbalance. The safety research of generator rotor retaining ring under the impact of negative sequence current is of great significance.
Yong Wang +3 more
openaire +1 more source
Unbalanced Current Sharing Control in Islanded Low Voltage Microgrids
Energies, 2018 This paper reports a new control strategy to improve sharing of unbalanced currents in islanded LV microgrids. This technique provides fast and effective sharing of positive-, negative- and zero-sequence currents, and is the first example of zero ...
Foad Najafi +2 more
doaj +1 more source
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