Train Impedance Reshaping Method for Suppressing Harmonic Resonance Caused by Various Harmonic Sources in Trains-Network Systems With Auxiliary Converter of Electrical Locomotive [PDF]
IEEE Access, 2019 With the development of electrified railway, harmonic resonance accidents occur from time to time. Based on the mechanism of resonance, a harmonic resonance suppression radical method by impedance reshaping is proposed.
Shihui Liu +4 more
doaj +2 more sources
Impedance Reshaping Method of DFIG System Based on Compensating Rotor Current Dynamic to Eliminate PLL Influence [PDF]
IEEE transactions on power electronics, 2023 The phase-locked loop (PLL) used in the doubly-fed induction generator (DFIG) can cause frequency-coupling phenomena, which will give negative-resistance characteristics of the DFIG at a low frequency, resulting in stability issues under weak-grid ...
Xiaoling Xiong +4 more
semanticscholar +4 more sources
Stability Improvement for Three-Phase Grid-Connected Converters Through Impedance Reshaping in Quadrature-Axis [PDF]
IEEE Transactions on Power Electronics, 2018 Three-phase AC−DC and DC−AC power converters have been extensively employed as grid-interfaces in various applications, e.g., distributed generation and energy storage systems. In these applications, power converters should always synchronize with the mains grid so that active and/or reactive power can properly be regulated while maintaining desired ...
Jingyang Fang +3 more
openaire +3 more sources
SSO Suppression Strategy of DFIG-Based Wind Turbine Based on Impedance Reshaping
IOP Conference Series: Earth and Environmental Science, 2020 Abstract In order to suppress the sub-synchronous oscillation (SSO) of DFIG-based wind power generation system, a new suppression strategy based on impedance reshaping is proposed in this paper. Firstly, the impedance model of DFIG-based wind power generation system set in static coordinate system is established, and the mechanism of SSO
Qihui Liu, Chun Shi, Simin Pang
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Dynamic Grid Voltage-Based Impedance-Reshaped Control for the Stability Enhancement of Grid-Connected DC/AC Converter System under Bidirectional Power Flow [PDF]
Energies, 2022 Considering the bidirectional three-phase DC/AC converter, it presents different impedance characteristics on AC side under different power flow directions, resulting in different stability margin.
Li Liu +4 more
doaj +2 more sources
A Double-PLLs-Based Impedance Reshaping Method for Extending Stability Range of Grid-Following Inverter Under Weak Grid [PDF]
IEEE transactions on power electronics, 2022 Conventional vector current control scheme has been widely used in grid-connected inverter systems. However, it suffers from severe power limitation issues under weak grids. This article reveals that the coupling effect between the power delivery and the
Liangwei Huang +3 more
semanticscholar +2 more sources
EnergiesGrid-forming (GFM) converters are critical supporting equipment for power systems with high penetration of renewable energy. However, their complex interactions with the grid can lead to broadband instability, posing a serious threat to system security ...
Hangyu Sun +6 more
doaj +2 more sources
Adaptive Impedance Reshaping Strategy for SPMSM Operating With Tight Speed Regulation
IEEE AccessEnsuring the stability of cascaded systems with constant power loads (CPLs) remains a critical challenge due to their negative incremental input admittance at low frequencies, which induces instability—particularly at higher power levels.
Hossam Ibrahim +2 more
doaj +2 more sources
A Gray-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping [PDF]
2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia), 2019 Oscillation phenomenon of grid-connected inverter can be caused due to time-varying grid impedance. Terminal output impedance of inverter can be reshaped by re-tuning internal parameters of inverter to mitigate the oscillation issue. However, it's not easy to obtain internal parameters of grid-connected inverter in practical operation.
Weihua Zhou +3 more
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