Results 21 to 30 of about 3,032 (260)

An improved fault control strategy for virtual synchronous generator with the coordination of STATCOM during unbalanced fault

IET Generation, Transmission & Distribution, 2023
The virtual synchronous generator (VSG) is a good solution for stabilizing the power system with high penetration of renewable energy. However, in case of serious unbalanced voltage disturbance/fault, the conventional VSG may lose voltage, inertia, and ...
Yu Wang, Liang Ji, Yifan Ding, Xiao Chang, Qiteng Hong, Botong Li, Zhenkun Li, Xingwu Yang   +7 more
doaj   +1 more source

An effective fault management scheme and comprehensive double line‐frequency ripple propagation analysis for MVDC networks

IET Generation, Transmission & Distribution, 2021
This paper proposes an effective fault management scheme for medium‐voltage direct current (MVDC) networks, which includes a virtual‐impedance‐based fault current limiter (VI‐FCL) on the DC side and a positive‐negative‐sequence (PNS) control scheme on ...
Dongsen Sun, Xiaonan Lu, Liang Du, Fei Lu   +3 more
doaj   +1 more source

Adaptive-Gain Second-Order Sliding Mode Direct Power Control for Wind-Turbine-Driven DFIG under Balanced and Unbalanced Grid Voltage

Energies, 2019
In a wind turbine system, a doubly-fed induction generator (DFIG), with nonlinear and high-dimensional dynamics, is generally subjected to unbalanced grid voltage and unknown uncertainty.
Yaozhen Han, Ronglin Ma
doaj   +1 more source

Resilience analysis and optimal control of grid‐connected converters under unbalanced voltage conditions

IET Power Electronics, 2023
The operational stability of grid‐connected converters is affected by unbalanced grid voltage, which often leads to overcurrent. The traditional control method maintains the grid‐into current within the rated limit by adjusting the current reference ...
Qi Wang, Peng Yu, Peng Wang
doaj   +1 more source

Finite Control Set Model Predictive Control for an LCL-Filtered Grid-Tied Inverter with Full Status Estimations under Unbalanced Grid Voltage

Energies, 2019
This paper proposes a novel finite control set model predictive control (FCS-MPC) strategy with merely grid-injected current sensors for an inductance-capacitance-inductance (LCL)-filtered grid-tied inverter, which can obtain a sinusoidal grid-injected ...
Xiaotao Chen, Weimin Wu, Ning Gao, Jiahao Liu, Henry Shu-Hung Chung, Frede Blaabjerg   +5 more
doaj   +1 more source

Direct power control of voltage source inverters with unbalanced grid voltages

IET Power Electronics, 2008
A new approach of direct power control (DPC) of a voltage source inverter for achieving symmetrical grid currents under unbalanced grid voltage conditions is presented. In these situations, negative sequence components appear on the grid voltage vector, leading to distorted currents if the power is maintained constant. Nevertheless, sinusoidal balanced
J. Eloy-García, S. Arnaltes, J.L. Rodríguez-Amenedo   +2 more
openaire   +1 more source

Optimal Suppression Strategy for Capacitor Voltage Ripples of Hybrid MMCs Under Unbalanced Grid Voltages

IEEE Transactions on Power Delivery, 2023
Submodule (SM) capacitor voltage ripples in modular multilevel converters (MMCs) can be suppressed by harmonic injection strategy, which can reduce the volume and cost of MMCs. The existing methods using the dual harmonic injection strategy for hybrid MMCs only consider steady-state conditions.
Jianzhong Xu, Junxin Wang, Yukun Yang, Jinan Wang, Gen Li   +4 more
openaire   +1 more source

Distorted Unbalanced Grid Voltage Modulated Direct Power Control for Three-Phase Grid-Connected Inverters

IEEE Open Journal of Power Electronics
In this paper, a linearized direct power control strategy for grid-connected inverters under distorted unbalanced grid voltage is proposed. The grid-connected inverters usually suffer from distorted unbalanced grid condition, which causes output active ...
Yi-Hung Liao, Meng-Hsuan Yu, Hao-Min Zhang   +2 more
doaj   +1 more source

Modeling method of sequence admittance for three-phase voltage source converter under unbalanced grid condition

Journal of Modern Power Systems and Clean Energy, 2018
The admittance is a strong tool for stability analysis and assessment of the three-phase voltage source converters (VSCs) especially in grid-connected mode.
Yang CEN, Meng HUANG, Xiaoming ZHA
doaj   +1 more source

A Control Strategy of DFIG under Unbalanced Grid Voltage

Elektronika ir Elektrotechnika, 2013
Under an unbalanced power grid voltage conditions, the DFIG’s stator side active power, reactive power, and electromagnetic torque will generate twice-multiplied frequency pulse quantities. In this paper, a double SRF (synchronous rotating coordinate system) control strategy was advanced.
Hui Xiao, Feiyan Liu
openaire   +1 more source