Results 1 to 10 of about 4,585 (165)

Grid-Connected Inverter Output Impedance Reshaping for Passivity Enhancement and Disturbance Rejection [PDF]

IEEE Access, 2021
To improve both the stability and the disturbance suppression ability of single-phase grid-connected inverters through LCL filters, this paper proposes an inverter output impedance enhancing control mechanism.
Zhiwei Bian, Yuqi Peng, Yuanbin He, Lijun Hang, Xiaogao Xie, Henry Shu-Hung Chung   +5 more
doaj   +2 more sources

A DFIG impedance reshaping method based on dynamic compensation of rotor current to enhance the stability in the mid-frequency band [PDF]

Scientific Reports
Although the research on doubly-fed induction generator (DFIG) has gained popularity, the phase-locked loop (PLL) used in the DFIG system leads to frequency coupling with negative resistive characteristics in the mid-frequency band, which reduces the ...
Haiqiao Zhao, Siyu Lyu, Bingyu Wang, Rui Wang   +3 more
doaj   +2 more sources

Moving impedance profiles make one-way, spectrum-reshaping mirrors

Physical Review Research
We find a set of exact solutions to Maxwell's equations in spacetime-varying materials, where the refractive index is constant, while the impedance exhibits effective motion, i.e., it is a function of x−vt.
Mingjie Li, S. A. R. Horsley
doaj   +3 more sources

Control Optimization Method for Ship Direct Current Microgrid Based on Impedance Reshaping

Journal of Marine Science and Engineering
In response to the constant power negative impedance characteristics on the load side of a ship DC microgrid, leading to voltage oscillation issues in the DC bus, this paper proposes a control optimization method based on impedance reshaping using bus ...
Weiqiang Liao, Xin Dong, Rongfeng Yang, Zhongfei Qiao   +3 more
doaj   +2 more sources

High-frequency Resonance Analysis and Impedance Reshaping Control of MMC-HVDC System Based on Frequency Coupling Impedance Model

Journal of Modern Power Systems and Clean Energy
In recent years, high-frequency resonance (HFR) events occurred in several modular multilevel converter based high-voltage direct current (MMC-HVDC) projects. The time delay of an MMC-HVDC system is the critical factor that induces HFR.
Juanjuan Wang, Wei Chen, Yuekun Liu, Chuang Fu, Yunming Ye, Junjie Feng   +5 more
doaj   +2 more sources

Impedance Reshaping Strategy for Battery Energy Storage Systems Based on Partial Power Conversion

Energies
To avoid additional component losses while significantly improving the energy conversion efficiency of battery energy storage systems, the application of series-connected partial power converter (S-PPC) technology in battery energy storage systems is ...
Ming Li, Yucheng Wu, Xiangxin Xi, Haibo Liu, Baizheng Xu, Long Jing   +5 more
doaj   +2 more sources

Stability Enhancement Method of Standalone Modular Multilevel Converters Based on Impedance Reshaping

Energies
Modular multilevel converters (MMCs) are susceptible to subsynchronous oscillations (SSOs) caused by impedance interactions in the power line. Current research into the stability of MMCs focuses mainly on voltage feed-forward control, while the effect of
Youzhuo Zheng, Long Hua, Yekui Yang, Chun Li, Chaoyi Luo, Zihong Song, Xingwu Yang, Haibo Feng   +7 more
doaj   +2 more sources

Impedance Reshaping Band Coupling and Broadband Passivity Enhancement for DFIG System [PDF]

IEEE Transactions on Power Electronics, 2023
Doubly fed induction generator (DFIG) based wind power systems incur a broadband negative resistive characteristic, resulting in resonance risks when connected with weak grid or diverse grid transmission infrastructure. The dominant factor and underlying mechanism of this broadband negative resistive characteristic are analyzed based on the passivity ...
Bin Hu, Heng Nian, Haipan Li, Liang Chen, Subham Sahoo, Frede Blaabjerg   +5 more
openaire   +1 more source

Impedance Reshaping Control Strategy for Improving Resonance Suppression Performance of a Series-Compensated Grid-Connected System

Energies, 2021
In the series-compensated grid-connected system (SCGCS), there is an impedance interaction between the inverter impedance and the grid impedance that is prone to cause resonance in the SCGCS.
Haining Wang, Yandong Chen, Wenhua Wu, Shuhan Liao, Zili Wang, Gaoxiang Li, Zhiwei Xie, Jian Guo   +7 more
doaj   +1 more source

Analysis and Reshaping on Impedance Characteristic of DFIG System Based on Symmetrical PLL [PDF]

IEEE Transactions on Power Electronics, 2020
With the increasing penetration of renewable energy, wind turbines based on doubly fed induction generators (DFIG) are becoming more and more important in the power system. The impedance reshaping control strategy based on the virtual impedance method can be utilized to solve the stability problem of the DFIG-grid interconnected system under the weak ...
Heng Nian, Bin Hu, Yunyang Xu, Chao Wu, Liang Chen, Frede Blaabjerg   +5 more
openaire   +1 more source