Analysis into the Impacts of Short Circuit Capacity and X/R Ratio on Voltage Stability in Wind Power Plants

2017 ◽  
Vol 10 (4) ◽  
pp. 268 ◽  
Author(s):  
Seyed Morteza Alizadeh ◽  
Cagil Ozansoy
Keyword(s):  
Wind Power ◽  
Power Plants ◽  
Voltage Stability ◽  
Short Circuit ◽  
Wind Power Plants ◽  
R Ratio

scholarly journals Developing a Mathematical Model for Wind Power Plant Siting and Sizing in Distribution Networks

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3485
Author(s):  
Seyed Morteza Alizadeh ◽  
Sakineh Sadeghipour ◽  
Cagil Ozansoy ◽  
Akhtar Kalam
Keyword(s):  
Wind Power ◽  
Distribution System ◽  
Power Plants ◽  
Voltage Stability ◽  
Short Circuit ◽  
Maximum Size ◽  
Distribution Networks ◽  
Induction Generator ◽  
Design Engineers ◽  
Point Of Common Coupling

Wind Power Plants (WPPs) are generally located in remote areas with weak distribution connections. Hence, the value of Short Circuit Capacity (SCC), WPP size and the short circuit impedance angle ratio (X/R) are all very critical in the voltage stability of a distribution system connected WPP. This paper presents a new voltage stability model based on the mathematical relations between voltage, the level of wind power penetration, SCC and X/R at a given Point of Common Coupling (PCC) of a distribution network connected WPP. The proposed model introduces six equations based on the SCC and X/R values seen from a particular PCC point. The equations were developed for two common types of Wind Turbine Generators (WTGs), including: the Induction Generator (IG) and the Double Fed Induction Generator (DFIG). Taking advantage of the proposed equations, design engineers can predict how the steady-state PCC voltage will behave in response to different penetrations of IG- and DFIG-based WPPs. In addition, the proposed equations enable computing the maximum size of the WPP, ensuring grid code requirements at the given PCC without the need to carry out complex and time-consuming computational tasks or modelling of the system, which is a significant advantage over existing WPP sizing approaches.

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 Voltage Stability Analysis of an Interconnected Power System Considering Varied Output of Wind Power Plants

2021 ◽  
Vol 56 (3) ◽  
pp. 111-123
Author(s):  
Muhammad Bachtiar Nappu ◽  
Ardiaty Arief ◽  
Ainun Maulidah
Keyword(s):  
Power Plant ◽  
Power System ◽  
Wind Power ◽  
Power Plants ◽  
Voltage Stability ◽  
Wind Power Plant ◽  
Voltage Profile ◽  
Interconnected Power System ◽  
Wind Power Plants ◽  
Ieee Standard

A sound power system must have voltage values at all buses that do not exceed the tolerance limit of ± 5% with small power losses. Voltage instability can be caused by interference or sudden power generation outage from the system. Indonesia's Southern Sulawesi power system has been interconnected with wind power plants located in Sidrap Regency and Jeneponto Regency. Wind speed energy used by wind power plants to generate electricity vary and not always constant. Hence, this can cause fluctuations and produce varied outputs that will affect the voltage profile and stability of the Southern Sulawesi interconnection system. Therefore, it is essential to assess the voltage stability of the Southern Sulawesi power system after the integration of Sidrap and Jeneponto WPPs. First, this study analyzes the voltage profile of the Southern Sulawesi interconnection system voltage after integrating the Sidrap wind power plants and Jeneponto Wind Power Plant during the peak day load and peak night load. Second, the study assesses the voltage stability with a varied output power of both Sidrap and Jeneponto Wind Power Plant. After integrating Sidrap and Jeneponto Wind Power Plants, the results showed that the voltage values at all system buses are stable and within the IEEE standard (between 0.95 p.u. and 1.05 p.u.). In addition, the voltages of the Southern Sulawesi power system with various outputs of both WPPs are still stable and within the IEEE standard.

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.

Sign in / Sign up

Export Citation Format

Share Document