scholarly journals Mechanism and Mitigation Strategy of Sub-synchronous Oscillation Caused by Grid-connected DFIG with Series Compensation

2021 ◽  
Vol 2125 (1) ◽  
pp. 012009
Author(s):  
Jing Yang ◽  
Yong Sun ◽  
Ladier Fa ◽  
Shuhan Zhang ◽  
Zhihao Wang ◽  
...  
Keyword(s):  
Power Systems ◽  
Transmission Lines ◽  
Notch Filter ◽  
Negative Resistance ◽  
Mitigation Strategy ◽  
Induction Generator ◽  
Synchronous Oscillation ◽  
Series Compensation ◽  
Doubly Fed ◽  
Control Interaction

Abstract Power systems are at risk of sub-synchronous oscillation (SSO) when connecting doubly-fed induction generator (DFIG)-based wind turbines to transmission lines with series compensation. This paper focuses on the mechanism and mitigation strategy of SSO. Firstly, the mechanism of SSO is studied from two aspects: induction generator effect (IGE) and sub-synchronous control interaction (SSCI). An equivalent circuit is developed to illustrate the negative resistance effect. Based on the result of the analysis, the SSO mitigation strategy using notch filter and virtual resistance control is proposed. In order to verify the result of analysis and the effectiveness of mitigation strategy, time-domain simulations are carried out based on PowerFactory DIgSILENT.

scholarly journals A Review on Fault Current Limiting Devices to Enhance the Fault Ride-Through Capability of the Doubly-Fed Induction Generator Based Wind Turbine

2018 ◽  
Vol 8 (11) ◽  
pp. 2059 ◽  
Author(s):  
Seyed Naderi ◽  
Pooya Davari ◽  
Dao Zhou ◽  
Michael Negnevitsky ◽  
Frede Blaabjerg
Keyword(s):  
Power Systems ◽  
Wind Turbine ◽  
Induction Generator ◽  
Fault Current ◽  
Doubly Fed Induction Generator ◽  
Advantages And Disadvantages ◽  
Fault Ride Through ◽  
Current Limiting ◽  
Two Factors ◽  
Doubly Fed

The doubly-fed induction generator has significant features compared to the fixed speed wind turbine, which has popularised its application in power systems. Due to partial rated back-to-back converters in the doubly-fed induction generator, fault ride-through capability improvement is one of the important subjects in relation to new grid code requirements. To enhance the fault ride-through capability of the doubly-fed induction generator, many studies have been carried out. Fault current limiting devices are one of the techniques utilised to limit the current level and protect the switches, of the back-to-back converter, from over-current damage. In this paper, a review is carried out based on the fault current limiting characteristic of fault current limiting devices, utilised in the doubly-fed induction generator. Accordingly, fault current limiters and series dynamic braking resistors are mainly considered. Operation of all configurations, including their advantages and disadvantages, is explained. Impedance type and the location of the fault current limiting devices are two important factors, which significantly affect the behaviour of the doubly-fed induction generator in the fault condition. These two factors are studied by way of simulation, basically, and their effects on the key parameters of the doubly-fed induction generator are investigated. Finally, future works, in respect to the application of the fault current limiter for the improvement of the fault ride-through of the doubly-fed induction generator, have also been discussed in the conclusion section.

Simulation and Control of Doubly Fed Induction Generator (DFIG) Used in Wind Turbines by Using Genetic Algorithm

2016 ◽  
Vol 10 (8) ◽  
pp. 1
Author(s):  
Faraz Chamani ◽  
Mohammad Satkin
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Wind Turbines ◽  
Reactive Power ◽  
Wind Farms ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Transient Faults ◽  
Active And Reactive Power ◽  
Doubly Fed

Wind energy is one of the extraordinary sources of renewable energy due to its clean character and free availability. With increase in wind power penetration, the wind farms are directly influencing the power systems. The majority of wind farms are using variable speed wind turbines equipped with doubly fed induction generators (DFIG) due to their advantages over other wind turbine generators (WTGs). Therefore, the analysis of wind power dynamics with the DFIG wind turbines has become a very important research issue, especially during transient faults. In this article, a controller is provided to control the active and reactive power of a wind system equipped with doubly fed induction generator. The generator is connected to the grid by a back to back converter that gets benefit from control system known as single periodic controller. Grid and generator side converters respectively control the generator speed and reactive power using proposed controller. In order to increase the accuracy of controller, we optimized its PI parameters using genetic optimization algorithm. Finally, simulation results conducted by the MATLAB software are shown. The results of simulation gained through this system, show the capability of proposed controller under error conditions for controlling active and reactive power and also elimination of harmonics caused by non-linear load.

Study of Sub-Synchronous Control Interaction (SSCI) Based on the Test Signal Method

2014 ◽  
Vol 989-994 ◽  
pp. 2980-2984
Author(s):  
Ben Feng Gao ◽  
Jin Liu ◽  
Shu Qiang Zhao
Keyword(s):  
Transmission Lines ◽  
Large Scale ◽  
Simulation Method ◽  
Test Signal ◽  
Equivalent Model ◽  
Series Compensation ◽  
Synchronous Control ◽  
The Impact ◽  
Signal Method ◽  
Control Interaction

Large-scale wind turbine generators with power electronic converters that operate near series compensated transmission lines are susceptible to un-damped sub-synchronous oscillations. This sub-synchronous oscillation is called Sub-synchronous Control Interaction (SSCI). Based on PSCAD / EMTDC simulation platform the establishment of Double Fed Induction Generator (DFIG) equivalent inverter controlled sources and network model, and verify the correctness of the equivalent model. Analysis the impact of series compensation and rotor-side converter PI parameters characteristic of the SSCI based on test signal method and time-domain simulation method. The results show that increasing the degree of series compensation , inner gain constant increases and inner integral time decreases will help increase SSCI, outer ring of PI parameters has little effect on the SSCI .

State Estimation of Doubly Fed Induction Generator Wind Turbine in Complex Power Systems

2016 ◽  
Vol 31 (6) ◽  
pp. 4935-4944 ◽  
Author(s):  
Shenglong Yu ◽  
Kianoush Emami ◽  
Tyrone Fernando ◽  
Herbert H. C. Iu ◽  
Kit Po Wong
Keyword(s):  
Power Systems ◽  
Wind Turbine ◽  
State Estimation ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Complex Power ◽  
Doubly Fed

scholarly journals Recurrence of Sub-Synchronous Oscillation Accident of Hornsea Wind Farm in UK and Its Suppression Strategy

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7685
Author(s):  
Xiangwu Yan ◽  
Wenfei Chang ◽  
Sen Cui ◽  
Aazim Rassol ◽  
Jiaoxin Jia ◽  
...  
Keyword(s):  
Power System ◽  
Wind Power ◽  
Control Strategy ◽  
Wind Farm ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Synchronous Oscillation ◽  
Wind Power System ◽  
Doubly Fed ◽  
Grid Side

A large-scale power system breakdown in the United Kingdom caused blackouts in several important cities, losing about 3.2 percent of the load and affecting nearly 1 million power users on 9 August 2019. On the basis of the accident investigation report provided by the UK National Grid, the specific reasons for the sub-synchronous oscillation of Hornsea wind farm were analyzed. The Hornsea wind power system model was established by MATLAB simulation software to reproduce the accident. To solve this problem, based on the positive and negative sequence decomposition, the control strategy of grid-side converter of doubly-fed induction generator is improved to control the positive sequence voltage of the generator terminal, which can quickly recover the voltage by compensating the reactive power at the grid side. Consequently, the influence of the fault is weakened on the Hornsea wind farm system, and the sub-synchronous oscillation of the system is suppressed. The simulation results verify the effectiveness of the proposed control strategy in suppressing the sub-synchronous oscillation of weak AC wind power system after being applied to doubly-fed induction generator, which serves as a reference for studying similar problems of offshore wind power.

Assessment of Power Systems with Doubly Fed Induction Generator Based Wind Turbines

2013 ◽  
Vol 19 (3) ◽  
pp. 811-815
Author(s):  
Andrew Gayo Kasembe ◽  
Zdenek Muller ◽  
Miroslav Muller
Keyword(s):  
Power Systems ◽  
Wind Turbines ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Doubly Fed
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