Quasi Self-Excited DFIG-Based Wind Energy Conversion System

Abstract

This paper introduces a new configuration of the DFIG-based wind energy conversion system (WECS) employing only a reduced-size Rotor Side Converter (RSC) in tandem with a supercapacitor. In the proposed structure, the Grid Side Converter (GSC) utilized in conventional DFIG-based WECSs is successfully eliminated. This is accomplished by employing the hydraulic transmission system (HTS) as a continuously variable and shaft decoupling transmission unit. This transforms the conventional constant-ratio drives by providing an opportunity to control the power flow through the generator's rotor circuit regardless of the wind turbine's shaft speed. This feature of HTS can be utilized to control the RSC power and ultimately regulate the supercapacitor voltage without a need for GSC. The proposed system is investigated and simulated in MATLAB Simulink at various wind speeds to validate the results and demonstrate the dynamic performance of the system.

Hybrid energy storage characterization for power profile enhancement in split‐shaft wind energy conversion systems

“…In a HTS, the hydraulic pump housed in a nacelle transfer the aerodynamic power of the wind turbine to pressurized fluid. Then, the pressurized fluid creates a driving torque and turns the hydraulic motor and generator placed at the ground level 25 . Various HTSs have been investigated in the literature 33 .…”

“…Utilizing a hydraulic transmission system (HTS) as a split‐shaft in wind energy conversion systems (WECS) can provide these decouples 23,24 . Furthermore, Utilizing a doubly‐fed induction generator (DFIG) alongside the HTS can reduce the system components and sizes 25 . This configuration can be employed to integrate a HESS without additional supporting hardware.…”

“…In the new configuration, the hybrid energy storage type and characteristics are identified to meet the power profile enhancements. The main contributions of the paper are as follows: Compared to our previous works, 23‐25 a HESS consists of a battery, supercapacitor, and flywheel integrated into a split‐shaft WECS. The proposed HESS configuration uses RSC and DFIG to control the HESS power allocation without additional dedicated hardware. The proposed integrated HESS is employed to smooth the output power fluctuations.…”

“…23,24 Furthermore, Utilizing a doubly-fed induction generator (DFIG) alongside the HTS can reduce the system components and sizes. 25 This configuration can be employed to integrate a HESS without additional supporting hardware. This means the rotor-side power converter (RSC) and the wind turbine generator can be employed as supporting hardware required for HESS.…”

Impact of Large-Scale Wind Power Penetration on Dynamic Voltage Stability of Interconnected Power System: An Indonesia Case Study

“…The first type is fix speed wind turbine which utilizing squirrel cage induction generator and permanent magnet synchronous generator without power electronic devices. The second types is variable speed wind turbine which can be operated in different wind speed level due to implementation of power electronic devices as energy conversion and control devices [4][5][6].…”