Results 261 to 270 of about 150,728 (293)

An Improved Grid Impedance Estimation Technique under Unbalanced Voltage Conditions

2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 2019
The coupling in synchronous reference frame (dq-axis) of grid-connected inverter reduces the estimation accuracy of grid impedance based on variations of inverter's output power. Therefore, in this paper, an improved grid impedance estimation technique (at fundamental frequency) based on small variations of the inverter's output power is proposed ...
Nabil Mohammed, Mihai Ciobotaru, Graham E. Town   +2 more
openaire   +1 more source

Direct Power Control of PWM Rectifier With Feedforward Compensation of DC-Bus Voltage Ripple Under Unbalanced Grid Conditions

IEEE transactions on industry applications, 2019
Three-phase voltage source pulsewidth modulation (PWM) rectifiers can achieve constant dc voltage and sinusoidal grid currents under ideal grid voltages.
Yongchang Zhang, Jian Jiao, Jie Liu, Jihao Gao   +3 more
semanticscholar   +1 more source

An improved finite control-set model predictive control for nested neutral point-clamped converters under both balanced and unbalanced grid conditions

International Journal of Electrical Power & Energy Systems, 2019
Finite control-set model predictive control (FCS-MPC) is an alternative strategy, in particular, for multi-level converters. However, the computational burden is rapidly increased with the number of voltage vectors to be predicted and objectives to be ...
Xing Liu, Dan Wang, Zhouhua Peng
semanticscholar   +1 more source

Advanced Control of Grid-Connected Current Source Converter Under Unbalanced Grid Voltage Conditions

IEEE Transactions on Industrial Electronics, 2018
There are technical challenges when the grid-connected current source converter operates under unbalanced grid voltage conditions. The negative sequence component of the unbalanced grid voltage would result in the low-frequency ripple at dc side, as well as current harmonics at ac side. It has an adverse impact on the system operation.
Xiaoqiang Guo 0002, Yong Yang 0015, Xue Zhang   +2 more
openaire   +1 more source

Robust Backstepping Control of Synchronverters under Unbalanced Grid Condition

2019 IEEE Power and Energy Conference at Illinois (PECI), 2019
Virtual Synchronous Generators, known as synchronverters, are inherently nonlinear systems and maintaining their consistent operation under faulty and distorted grid requires a nonlinear control design. This paper presents backstepping as an adaptive stabilizing technique which enables full power injection to the grid under unbalanced and weak ...
Sara Yazdani, Mehdi Ferdowsi
openaire   +1 more source

Control Strategy of Cascade STATCOM Under Unbalanced Grid Conditions

IETE Technical Review, 2014
ABSTRACTPower network imbalance has become an increasingly serious problem, particularly in coal mines. This study presents an improved control strategy of cascade STATCOM under unbalanced grid conditions. This study investigates the balance and control of all DC capacitor voltages, from global balancing control, clustered balancing control and ...
Xia Zhenglong, Shi Liping, Yang Xiaodong
openaire   +1 more source

Control of a three-phase inverter under unbalanced grid conditions

2017 IEEE Energy Conversion Congress and Exposition (ECCE), 2017
A control strategy for a three-phase grid connected inverter with LCL filter based on Lyapunov energy function during unbalanced grid conditions is presented in this paper. To reduce complexity and number of variables the control strategy is accomplished in a stationary two phase reference frame.
Vikram Roy Chowdhury, Subhajyoti Mukherjee, Pourya Shamsi, Mehdi Ferdowsi   +3 more
openaire   +1 more source

An optimal initialisation for robust model reference adaptive PI controller for grid-tied power systems under unbalanced grid conditions

Engineering applications of artificial intelligence, 2023
P. Evald, G. Hollweg, L. Borin, E. Mattos, R. Tambara, V. Montagner, H. Gründling   +6 more
semanticscholar   +1 more source

A MATLAB tool to study harmonics penetration in grid unbalanced conditions

2016 17th International Conference on Harmonics and Quality of Power (ICHQP), 2016
Harmonics is a very important subject in the area of power quality, due to the negative impacts they bring to the network. This paper presents a computational tool using MATLAB to study harmonic penetration in electric grids. The platform is then applied to a distribution system under balanced and unbalanced conditions at different harmonic frequencies.
M. F. Zambroni de Souza, M. L. Pereira, P. M Silveira, P. Ribeiro   +3 more
openaire   +1 more source

Enhanced Controllers of DFIG with Unbalanced and Distorted Grid Voltage Conditions

2014
This project focuses on the enhanced and development of the controller of doubly fed induction generator (DFIG) with unbalanced and distorted grid voltage conditions. Real, reactive power and electromagnetic torque are improved by using the design and development of the proportional integral-dual frequency resonator (PI-DFR), Second order generalized ...
A. Ramkumar, S. Durairaj, K. Dhivya
openaire   +1 more source