The Experts below are selected from a list of 27780 Experts worldwide ranked by ideXlab platform
Xudong Zou - One of the best experts on this subject based on the ideXlab platform.
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An improved low-voltage ride-through control strategy of doubly fed induction generator during grid faults
IEEE Transactions on Power Electronics, 2011Co-Authors: Sheng Hu, Xinchun Lin, Yong Kang, Xudong ZouAbstract:This paper presents a control strategy to improve the low-voltage ride-through capability of a doubly fed induction generator (DFIG); since the stator of a DFIG is directly connected to a grid, this sort of machine is very sensitive to grid disturbance. Grid voltage sag causes overcurrents and overvoltages in rotor windings, which can damage the rotor-side converter (RSC). In order to protect the RSC, a classical solution based on installation of the so-called crowbar is adopted; however, as the DFIG absorbs reactive power from the grid, this type of solution deteriorates grid voltage sags and cannot meet the Requirements of a new grid Code. An improved control strategy which uses virtual resistance to limit rotor side overcurrents is proposed in this paper, which can make a crowbar inactive and supply reactive power to fulfill the latest grid Code Requirement during voltage sags. In order to validate the proposed strategy, simulations and experiments have been carried out, and the results demonstrate the effectiveness of the proposed strategy.
Suud Ademnur Hasen - One of the best experts on this subject based on the ideXlab platform.
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novel fault ride through scheme and control strategy for doubly fed induction generator based wind turbine
IEEE Transactions on Energy Conversion, 2015Co-Authors: Pohsu Huang, Mohamed Shawky El Moursi, Suud Ademnur HasenAbstract:This paper presents a novel modulated series dynamic braking resistor (MSDBR) control strategy for enhancing the fault ride-through (FRT) of doubly fed induction generator-based wind turbines. The proposed cost-effective protection scheme introduces a voltage booster that offers series voltage compensation capability and provides a means of power evacuation to mitigate the power imbalance during grid faults. To attain flexible and robust control solution for handling both balanced and unbalanced grid faults, the proposed scheme employs a modulated pulse width modulation (PWM) switching technique to control the stator phase voltage individually. The proposed transient management scheme allows the MSDBR to mitigate the impact from different types of grid faults and to fulfill with the recent grid Code Requirement. Also, reactive current injection capability during faults is also investigated with the proposed voltage reference algorithm. For the controller design, small-signal modeling is utilized with consideration of measurement dynamics for the tuning of controller parameters in order to ensure the system robustness and stability. Finally, the simulation results demonstrate the satisfactory performance of the MSDBR with its preferred allocation for enhancing the FRT performance against both balanced and unbalanced faults.
Joao P. S. Catalao - One of the best experts on this subject based on the ideXlab platform.
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grid Code reinforcements for deeper renewable generation in insular energy systems
Renewable & Sustainable Energy Reviews, 2016Co-Authors: E. M.g. Rodrigues, Abebe W. Bizuayehu, G J Osorio, Radu Godina, Juan M Lujanorojas, Joao P. S. CatalaoAbstract:Introduction of renewable energy sources (RES) in insular areas is growing on different islands of various regions in the world and the large-scale deployment of renewables in island power systems is appealing to local attention of grid operators as a method to decrease fossil fuel consumption. Planning a grid based on renewable power plants (RPP) presents serious challenges to the normal operation of a power system, precisely on voltage and frequency stability. Despite of its inherent problems, there is a consensus that in near future the RES could supply most of local needs without depending exclusively on fossil fuels. In previous grid Code compliance, wind turbines did not required services to support grid operation. Thus, in order to shift to large-scale integration of renewables, the insular grid Code ought to incorporate a new set of Requirements with the intention of regulating the inclusion of these services. Hence, this paper discusses grid Code Requirements for large-scale integration of renewables in an island context, as a new contribution to earlier studies. The current trends on grid Code formulation, towards an improved integration of distributed renewable resources in island power systems, are addressed. The paper also discusses advanced grid Code Requirement concepts such as virtual wind inertia and synthetic inertia for improving regulation capability of wind farms and the application of energy storage systems (EES) for enhancing renewable generation integration. Finally, a comparative analysis of insular grid Code compliance to these Requirements is presented in the European context.
Sheng Hu - One of the best experts on this subject based on the ideXlab platform.
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An improved low-voltage ride-through control strategy of doubly fed induction generator during grid faults
IEEE Transactions on Power Electronics, 2011Co-Authors: Sheng Hu, Xinchun Lin, Yong Kang, Xudong ZouAbstract:This paper presents a control strategy to improve the low-voltage ride-through capability of a doubly fed induction generator (DFIG); since the stator of a DFIG is directly connected to a grid, this sort of machine is very sensitive to grid disturbance. Grid voltage sag causes overcurrents and overvoltages in rotor windings, which can damage the rotor-side converter (RSC). In order to protect the RSC, a classical solution based on installation of the so-called crowbar is adopted; however, as the DFIG absorbs reactive power from the grid, this type of solution deteriorates grid voltage sags and cannot meet the Requirements of a new grid Code. An improved control strategy which uses virtual resistance to limit rotor side overcurrents is proposed in this paper, which can make a crowbar inactive and supply reactive power to fulfill the latest grid Code Requirement during voltage sags. In order to validate the proposed strategy, simulations and experiments have been carried out, and the results demonstrate the effectiveness of the proposed strategy.
Pohsu Huang - One of the best experts on this subject based on the ideXlab platform.
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novel fault ride through scheme and control strategy for doubly fed induction generator based wind turbine
IEEE Transactions on Energy Conversion, 2015Co-Authors: Pohsu Huang, Mohamed Shawky El Moursi, Suud Ademnur HasenAbstract:This paper presents a novel modulated series dynamic braking resistor (MSDBR) control strategy for enhancing the fault ride-through (FRT) of doubly fed induction generator-based wind turbines. The proposed cost-effective protection scheme introduces a voltage booster that offers series voltage compensation capability and provides a means of power evacuation to mitigate the power imbalance during grid faults. To attain flexible and robust control solution for handling both balanced and unbalanced grid faults, the proposed scheme employs a modulated pulse width modulation (PWM) switching technique to control the stator phase voltage individually. The proposed transient management scheme allows the MSDBR to mitigate the impact from different types of grid faults and to fulfill with the recent grid Code Requirement. Also, reactive current injection capability during faults is also investigated with the proposed voltage reference algorithm. For the controller design, small-signal modeling is utilized with consideration of measurement dynamics for the tuning of controller parameters in order to ensure the system robustness and stability. Finally, the simulation results demonstrate the satisfactory performance of the MSDBR with its preferred allocation for enhancing the FRT performance against both balanced and unbalanced faults.