Fault Currents Contribution in Short Circuit Scenario of Conventional Wind Power Plants and DFIG

2021 ◽  
Author(s):  
Langlang Gumilar ◽  
Mokhammad Sholeh ◽  
Wahyu Sapto Nugroho
Keyword(s):  
Wind Power ◽  
Power Plants ◽  
Short Circuit ◽  
Wind Power Plants ◽  
Fault Currents

scholarly journals Modelling and Stability Analysis of Wind Power Plants Connected to Weak Grids

2019 ◽  
Vol 9 (21) ◽  
pp. 4695 ◽  
Author(s):  
Esmaeil Ebrahimzadeh ◽  
Frede Blaabjerg ◽  
Torsten Lund ◽  
John Godsk Nielsen ◽  
Philip Carne Kjær
Keyword(s):  
Power Plant ◽  
Wind Turbine ◽  
Wind Power ◽  
Power Plants ◽  
Short Circuit ◽  
Wind Power Plant ◽  
Negative Sequence ◽  
Weak Grid ◽  
Wind Power Plants ◽  
Sequence Domain

It is important to develop modelling tools to predict unstable situations resulting from the interactions between the wind power plant and the weak power system. This paper presents a unified methodology to model and analyse a wind power plant connected to weak grids in the frequency-domain by considering the dynamics of the phase lock loop (PLL) and controller delays, which have been neglected in most of the previous research into modelling of wind power plants to simplify modelling. The presented approach combines both dq and positive/negative sequence domain modelling, where a single wind turbine is modelled in the dq domain but the whole wind power plant connected to the weak grid is analysed in the positive/negative sequence domain. As the proposed modelling of the wind power plant is systematic and modular and based on the decoupled positive/negative sequence impedances, the application of the proposed methodology is relevant for transmission system operators (TSOs) to assess stability easily with a very low compactional burden. In addition, as the analytical dq impedance models of the single wind turbine are provided, the proposed methodology is an optimization design tool permitting wind turbine manufacturers to tune their converter control. As a case study, a 108 MW wind power plant connected to a weak grid was used to study its sensitivity to variations in network short-circuit level, X/R ratio and line series capacitor compensation (Xc/Xg).

scholarly journals Equivalent Modeling of DFIG-Based Wind Power Plant Considering Crowbar Protection

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
Qianlong Zhu ◽  
Ming Ding ◽  
Pingping Han
Keyword(s):  
Wind Power ◽  
Power Plants ◽  
Short Circuit ◽  
Grid Connection ◽  
Wind Power Plants ◽  
Voltage Dip ◽  
Terminal Voltage ◽  
Current Characteristics ◽  
Doubly Fed ◽  
Crowbar Protection

Crowbar conduction has an impact on the transient characteristics of a doubly fed induction generator (DFIG) in the short-circuit fault condition. But crowbar protection is seldom considered in the aggregation method for equivalent modeling of DFIG-based wind power plants (WPPs). In this paper, the relationship between the growth of postfault rotor current and the amplitude of the terminal voltage dip is studied by analyzing the rotor current characteristics of a DFIG during the fault process. Then, a terminal voltage dip criterion which can identify crowbar conduction is proposed. Considering the different grid connection structures for single DFIG and WPP, the criterion is revised and the crowbar conduction is judged depending on the revised criterion. Furthermore, an aggregation model of the WPP is established based on the division principle of crowbar conduction. Finally, the proposed equivalent WPP is simulated on a DIgSILENT PowerFactory platform and the results are compared with those of the traditional equivalent WPPs and the detailed WPP. The simulation results show the effectiveness of the method for equivalent modeling of DFIG-based WPP when crowbar protection is also taken into account.

scholarly journals Proposal for Generic Characterization of Electrical Test Benches for AC- and HVDC-Connected Wind Power Plants

2019 ◽  
Author(s):  
Behnam Nouri ◽  
Ömer Göksu ◽  
Vahan Gevorgian ◽  
Poul Ejnar Sørensen
Keyword(s):  
Power System ◽  
Wind Power ◽  
Power Plants ◽  
Short Circuit ◽  
General Structure ◽  
Industrial Test ◽  
Electrical Characteristics ◽  
Electrical Test ◽  
Wind Power Plants ◽  
Real Time Digital Simulator

Abstract. The electrical test and assessment of wind turbines (WT) are going hand in hand with standards and network connection requirements. In this paper, the latest developments in the testing of the electrical characteristics of WTs, including IEC standards, compliance test methods, and industrial test benches, are studied. In this paper, the general structure of advanced electrical test benches, including grid emulator or controllable grid interface (CGI), wind torque emulator and device under test (DUT), has been proposed to harmonize the available industrial test sites. The AC and HVDC transmission systems impose different electrical characteristics on wind power plants (WPP). HVDC connection leads to a converter-based grid, yet AC connection has different grid characteristics in terms of grid impedance, short circuit ratio (SCR), inertia, and background harmonics. Therefore, this paper recommends performing compliance tests in two divisions as AC- and HVDC-connected WTs using a converter-based CGI and emulate the corresponding AC grid for DUT. Also, this paper recommends the additional tests for the current version of IEC 61400-21-1. The additional tests consist of test options for new features of modernWTs, such as Grid-forming, system restoration, and black start capabilities, as well as emulation of different grid characteristics, such as detailed power system, inertia, SCR, and different grid connection emulations for DUT. This way, the possibility of research, development, and demonstration studies on WTs and WPPs would increase. The proposed additional tests can be implemented using the available advanced test benches by adjusting their control systems. Since most of the industrial test benches are based on converters, the characteristics of a real power system can be emulated by a CGI coupled with real-time digital simulator (RTDS) systems through high-bandwidth power-hardware-in-the-loop (PHIL) interface.

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