Sizing of Converters Interfacing the Rotor of Wind Driven DFIG to the Power Grid

Abstract

In this paper, the operation of the Double Fed Induction Generator (DFIG) in the range from synchronous speed down to sub-synchronous speeds is analyzed using the power-flow approach. The objective of this analysis is to determine a ceiling for the rating of the converter interfacing the rotor of the wind driven double fed induction generator (DFIG) to the grid. Sizing the converter is an important issue in determining the economic viability of using the DFIM as a generator at synchronous and sub-synchronous speeds in wind energy conversion systems. The size of the converter is proved to be less than 10% of the rated power of the DFIG, which is 40% to 67% lower than that estimated in previous publications

Enhancing the LVRT capability of grid connected wind energy conversion system using Unified Power Quality Controller

“…The rotor side converter (RSC) is utilized to control the electromagnetic torque and the excitation of the generator, while the generator side converter (GSC) controls the dc-link voltage. Since only the slip power is handled by the converter, the power rating of the converter can be only a fraction of the rated power of the wind turbine, typically in the range of 10% as proved by the authors of this paper [7]. where v ds and v qs are the d&q stator voltages, v dr and v qr are the d&q rotor voltages, i ds and i qs are the d&q stator currents, i dr and i qr are the d&q rotor currents, ω e is the supply angular frequency, ω r is the rotor angular frequency, and λ ds and λ qs are the d&q stator flux linkage, λ dr and λ qr are the d&q rotor flux linkages:…”

Superconducting magnetic energy storage for stabilizing grid integrated with wind power generation systems

“…The cost of power converter is 6% of total wind turbine cost. This can be reduced to 2.5% for DFIG type wind turbine as the required converter capacity is 30% of the rated power of the wind generator [80].…”

Economic Modeling for the Renewable Energy Support

“…This means that the application of DC distribution systems must give a bonus point for RE so that the converter stations attached to WF or solar sources may not be required. It is another new strategy to improve the performance of RE applications in spite of the trying of Saleh and Eskandar (2011) [16] to define the sizing of converters for machine drives. The support would be from the electricity companies to go towards the proposed idea in addition to the industry field to manufacture equipments and devices for DC networks.…”