Neutral grounding in wind farm medium voltage collector grids

2011 ◽  
Author(s):  
C. Feltes ◽  
R. van de Sandt ◽  
F. Koch ◽  
F. Shewarega ◽  
I. Erlich
Keyword(s):  
Wind Farm ◽  
Medium Voltage

Research of Large-Scale Offshore Wind Farm Collection System Short Circuit Equivalent Network

2013 ◽  
Vol 448-453 ◽  
pp. 1732-1737
Author(s):  
Liu Bin ◽  
Hong Wei Cui ◽  
Li Xu ◽  
Kun Wang ◽  
Zhu Zhan ◽  
...  
Keyword(s):  
Large Scale ◽  
Wind Farm ◽  
Short Circuit ◽  
Short Circuit Current ◽  
System Optimization ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Collection System ◽  
Medium Voltage ◽  
The Impact

This paper analyses the characteristics of large-scale offshore wind farm collection network and the impact of the medium voltage collection system optimization,while from the electrical technology point,it proposes the short circuit current of the collection network computational model and algorithms,based on the principle of equivalent circuit.Taking a wind power coolection system planned for a certain offshore wind farm planning for example, the validity of the model and algorithm is verified.

scholarly journals Modelling and control of a VSC medium-voltage DC distribution network with DFIG wind farm

2017 ◽  
Vol 2017 (13) ◽  
pp. 2502-2507 ◽  
Author(s):  
Simiyu Patrobers ◽  
Xin Ai ◽  
Bitew Girmaw Teshager ◽  
Wang Kunyu
Keyword(s):  
Wind Farm ◽  
Distribution Network ◽  
Medium Voltage ◽  
Dc Distribution ◽  
And Control ◽  
Medium Voltage Dc

scholarly journals Evaluation of Medium Voltage Network for Propagation of Supraharmonics Resonance

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 1093
Author(s):  
Shimi Sudha Letha ◽  
Angela Espin Delgado ◽  
Sarah K. Rönnberg ◽  
Math H. J. Bollen
Keyword(s):  
Wind Farm ◽  
Low Voltage ◽  
Electrical Network ◽  
Switching Frequency ◽  
Power Sources ◽  
Transfer Impedance ◽  
Medium Voltage ◽  
High Switching Frequency ◽  
Wide Range ◽  
The Impact

Power converters with high switching frequency used to integrate renewable power sources to medium and low voltage networks are sources of emission in the supraharmonic range (2 to 150 kHz). When such converters are connected to a medium voltage (MV) network these supraharmonics propagate through the MV network and can impact network and customer equipment over a wide range. This paper evaluates an existing Swedish MV electrical network and studies the pattern of supraharmonic resonance and the propagation of supraharmonics. The MV network consists of eight feeders including a small wind farm. Simulations reveal that, the bigger the MV network, the more resonant frequencies, but also the lower the amplitude of the resonance peaks in the driving point impedance. It was also identified that for short feeders as length increases, the magnitude of the transfer impedance at supraharmonic frequency decreases. For further increment in feeder length, the magnitude increases or becomes almost constant. For very long feeders, the transfer impedance further starts decreasing. The eight feeders in the network under study are similar but show completely different impedance versus frequency characteristics. Measurements at the MV side of the wind farm show time varying emissions in the supraharmonic range during low power production. The impact of these emissions coupled with system resonance is examined.

scholarly journals Voltage regulation and power losses reduction in a wind farm integrated MV distribution network

2018 ◽  
Vol 69 (1) ◽  
pp. 85-92 ◽  
Author(s):  
Ghaeth Fandi ◽  
Famous Omar Igbinovia ◽  
Josef Tlusty ◽  
Rateb Mahmoud
Keyword(s):  
Power Electronics ◽  
Wind Farm ◽  
Reactive Power ◽  
Distribution Networks ◽  
Voltage Regulation ◽  
Electric Power System ◽  
Voltage Source ◽  
Voltage Profile ◽  
Power Losses ◽  
Medium Voltage

Abstract A medium-voltage (MV) wind production system is proposed in this paper. The system applies a medium-voltage permanent magnet synchronous generator (PMSG) as well as MV interconnection and distribution networks. The simulation scheme of an existing commercial electric-power system (Case A) and a proposed wind farm with a gearless PMSG insulated gate bipolar transistor (IGBT) power electronics converter scheme (Case B) is compared. The analyses carried out in MATLAB/Simulink environment shows an enhanced voltage profile and reduced power losses, thus, efficiency in installed IGBT power electronics devices in the wind farm. The resulting wind energy transformation scheme is a simple and controllable medium voltage application since it is not restrained by the IGBT power electronics voltage source converter (VSC) arrangement. Active and reactive power control is made possible with the aid of the gearless PMSG IGBT power converters.

scholarly journals Study on Transient Overvoltage of Offshore Wind Farm Considering Different Electrical Characteristics of Vacuum Circuit Breaker

2019 ◽  
Vol 7 (11) ◽  
pp. 415 ◽  
Author(s):  
Zikai Zhou ◽  
Yaxun Guo ◽  
Xiaofeng Jiang ◽  
Gang Liu ◽  
Wenhu Tang ◽  
...  
Keyword(s):  
Wind Farm ◽  
Circuit Breaker ◽  
Dielectric Strength ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Medium Voltage ◽  
Collector System ◽  
Vacuum Circuit Breaker ◽  
Experimental Parameters ◽  
Transient Overvoltage

For the study of transient overvoltage (TOV) in an offshore wind farm (OWF) collector system caused by switching off vacuum circuit breakers (VCBs), a simplified experimental platform of OWF medium-voltage (MV) cable collector system was established in this paper to conduct switching operation tests of VCB and obtain the characteristic parameters for VCB, especially dielectric strength parameters; also, the effectiveness of the VCB reignition model was verified. Then, PSCAD/EMTDC was used to construct the MV collector system of the OWF, and the effects of normal switching and fault switching on TOV amplitude, steepness, and the total number of reignition of the VCB were studied, respectively, with the experimental parameters and traditional parameters of dielectric strength of the VCB. The simulation results show that when the VCB is at the tower bottom, the overvoltage amplitude generated by the normal switching is the largest, which is 1.83 p.u., and the overvoltage steepness of the fault switching is the largest, up to 142 kV/μs. The overvoltage amplitude and steepness caused by switching off VCB at the tower bottom faultily with traditional parameters are about 2 and 1.5 times of the experimental parameters under the same operating condition.

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