Results 221 to 230 of about 3,032 (260)

Voltage source converter control under unbalanced grid voltage conditions

2017 XXVI International Conference on Information, Communication and Automation Technologies (ICAT), 2017
This paper proposes a novel control method for voltage source converter (VSC) connected to grid under unbalanced voltage conditions. The method is based on utilizing the full control capabilities of the switching converter. The proposed method makes the voltage source inverter (VSI) supply the voltages according to the requirements of the load and/or ...
Akhtar Rasool, Fiaz Ahmad, Asif Sabanoviç   +2 more
openaire   +1 more source

Impact of unbalanced electric vehicle charging on low-voltage grids

2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), 2020
During the past years, the rising market penetration of electric vehicles (EV) has gained significant attention due to its influence on power system stability. Voltage unbalances caused by single-phase charging EVs and plug-in hybrid electric vehicles (PHEV) becomes a major power quality issue in weak low voltage grids.
Sebastian Helm, Ines Hauer, Martin Wolter, Christoph Wenge, Stephan Balischewski, Przemyslaw Komarnicki   +5 more
openaire   +1 more source

Nonsinusoidal power caused by measurements of grid impedances at unbalanced grid voltages

2008 International School on Nonsinusoidal Currents and Compensation, 2008
At low-voltage level there is already a commercial measurement device that is able to identify the grid impedance in dependency of time and frequency. Since at the low-voltage level a four-wire system and at the medium-and high-voltage level a three-wire system is installed, the method to identify the grid impedance has to be varied.
null Trung Do Thanh, Steffen Schostan, Klaus-Dieter Dettmann, Detlef Schulz   +3 more
openaire   +1 more source

A control scheme of the VIENNA rectifier with unbalanced grid voltage

2017 Chinese Automation Congress (CAC), 2017
VIENNA rectifier with simple structure, which is widely used in charging systems for electric vehicle, realizes the operation of unit power factor and low harmonic. However, grid voltage unbalance will aggravate the dc-link voltage ripple and input current THD.
Jiajun Liu, Wenlong Ding, Han Qiu, Chenghui Zhang, Bin Duan   +4 more
openaire   +1 more source

Power Control of Grid-Connected Converters Under Unbalanced Voltage Conditions

IEEE Transactions on Industrial Electronics, 2015
This paper presents a grid current control technique on the power converter level. The submitted analysis deals with a control method of positive and negative current sequences in a grid-connected converter during voltage sags. The control method should assure the proper exchange of active and reactive powers without power ripple, the mitigation of ...
Viktor Valouch, Martin Bejvl, Petr Simek, Jirí Skramlík   +3 more
openaire   +1 more source

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

The control for grid connected inverter of distributed generation under unbalanced grid voltage

2009 International Conference on Sustainable Power Generation and Supply, 2009
This paper describes a new control scheme of grid connected inverter of DG (distributed generation) under unbalanced grid voltage. In this paper, the proposed scheme of synchronous reference frame (SRF) controller can reduce the influence of unbalanced grid voltage, which is mainly caused by unbalanced distribution of single-phase and non-linear loads,
null Zhang Guowei, null Wei Tongzhen, null Huang Shengli, null Kong Lingzhi   +3 more
openaire   +1 more source

Modeling and control of a grid-connected BDFM under unbalanced grid voltage conditions

2011 IEEE International Electric Machines & Drives Conference (IEMDC), 2011
info:eu-repo/semantics ...
Sotoodeh, Pedram, Seyedmahdi, Izadkhast, Khosravi, Hamed, Oraee, Hashem   +3 more
openaire   +2 more sources

The Simulation Studies of PWM Voltage Source Rectifier under Unbalanced Grid Voltage

Applied Mechanics and Materials, 2014
Under the balanced or unbalanced grid voltage, the PWM voltage source rectifiers should have many advantages such as sinusoidal input current, unity power factor, four-quadrant operation, the DC voltage stability, etc., so it can be employed in very broad application field.
Jun Li Zhang, Yu Ren Li
openaire   +1 more source

An Improved Voltage-Type Grid-Connected Control Strategy for Compensating Unbalanced Voltage

2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
During grid faults, the grid-connected inverter (GCI) cannot work well by only using the traditional droop control. Besides, the unbalance factor of voltage/current at Common Coupling Point (PCC) may increase significantly. Therefore, in order to ensure GCI stable operation during grid fault, the GCI should integrate the ability to compensate for the ...
Liu Hongpeng, Zhou Jiajie, Wang Wei
openaire   +1 more source