scholarly journals Grid Forming Stator Flux Control of Doubly-Fed Induction Generator

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6766
Author(s):  
Norbert Klaes ◽  
Florian Pöschke ◽  
Horst Schulte
Keyword(s):  
Reactive Power ◽  
Induction Machine ◽  
Induction Generator ◽  
System Response ◽  
Doubly Fed Induction Generator ◽  
Generator System ◽  
Flux Control ◽  
Doubly Fed Induction Machine ◽  
Stator Flux ◽  
Doubly Fed

The doubly fed induction generator is widely used in wind power applications. For stand-alone operation of this machine, the control of the stator flux with fixed voltage and frequency has been proposed. This paper extends the stator flux control of the doubly fed induction machine by droop mechanisms, which vary the setpoint of flux magnitude and frequency depending on active and reactive power. This gives the doubly fed induction generator system unknown grid supporting and grid forming performance. The validation of the proposed control scheme has been conducted on a 10kVA testbed system. The closed-loop behavior of the system has been proven to enable grid-tied and islanded operation with the same control structure. The system response to load changes and islanding events show no disruptive transients in both conditions.

Direct Power Control of Doubly Fed Induction Generator Based on the Estimated Stator Flux

2014 ◽  
Vol 1070-1072 ◽  
pp. 1111-1114
Author(s):  
Jing Wang ◽  
Xiang Dong Wang
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Dynamic Performance ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Direct Power ◽  
Direct Power Control ◽  
Active And Reactive Power ◽  
Stator Flux ◽  
Doubly Fed

In order to improve the dynamic performance, based on the analysis of the dynamic model of doubly fed induction generator (DFIG), this paper presents an improved direct power control strategy which is based on the direct control of stator active and reactive power of DFIG. The proposed method only utilizes the estimated stator flux by the stator resistance which is the only machine parameter, so as to remove the power dithering resulting from the inaccuracy associated with rotor flux estimation. In the Matlab/Simulink, simulation results for a 15KW DFIG system demonstrate the high accuracy and excellent dynamic performance during variations of active and reactive power, and revolution.

Stator Flux Orientation Decoupled Power Control of Doubly-Fed Induction Generator

2013 ◽  
Vol 394 ◽  
pp. 278-283
Author(s):  
Feng Zhang ◽  
Chong Chong Bai ◽  
Feng Qiao ◽  
Ye Hui Lu
Keyword(s):  
Mathematical Model ◽  
Power Control ◽  
Reactive Power ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Simulation Studies ◽  
Active And Reactive Power ◽  
Simulation Results ◽  
Stator Flux ◽  
Doubly Fed

The overall mathematical model of doubly-fed induction generator (DFIG) is established in this paper, a controller is designed in detail for DFIG under the strategy of stator flux orientation (SFO). Simulation studies are carried out in this paper with Matlab/Simulink under three operation states of DFIG, the simulation results verified that the controller designed can realize the decoupling of active and reactive power effectively.

scholarly journals Application of Passivity-Based Control and Time-Frequency Representation in a Doubly Fed Induction Generator System

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Yingpei Liu ◽  
Haiping Liang
Keyword(s):  
High Performance ◽  
Reactive Power ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Generator System ◽  
Time Frequency ◽  
Frequency Representation ◽  
Passivity Based Control ◽  
Doubly Fed ◽  
Rotor Side Converter

In order to improve the performance of a doubly fed induction generator (DFIG) system, we put forward a high performance nonlinear passivity-based control (PBC) method on DFIG. Firstly, we build a PBC mathematical model for DFIG. We design the passive controller for the inner loop in the control system based on passivity theory. Then we calculate the rotor’s control voltages which are modulated afterwards to pulse to control the rotor side converter. The maximal wind energy capture is effectively realized. The rotor speed and DFIG currents fast track their expected values. The independent regulation of the stator active power and reactive power is achieved. Finally we perform simulations to verify the effectiveness of the proposed method. Furthermore, we employ the Wigner-Ville distribution (WVD) and continuous wavelet transform (CWT) as two time-frequency representation methods to indicate that the proposed method in the paper performs well from the perspective of energy distribution in time and frequency domain.

scholarly journals A Rotor-Sync Signal-Based Control System of a Doubly-Fed Induction Generator in the Shaft Generation of a Ship

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 188 ◽  
Author(s):  
Trong-Thang Nguyen
Keyword(s):  
Control System ◽  
Induction Machine ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Rotor Speed ◽  
Grid Voltage ◽  
Induction Generators ◽  
Generator Voltage ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed

A doubly-fed induction machine in generator-mode is popularly used for energy generation, particularly in the case of a variable speed, such as in the wind generator, the shaft generator of a ship, because the doubly-fed induction generator is able to maintain a stable frequency when changing the rotor speed. This paper aims to propose a novel method for controlling the shaft generation system of a ship using a doubly-fed induction generator. This method uses the rotor signals of a small doubly-fed induction machine as base components to create the control signal for the doubly-fed induction generators. The proposed method will be proven by both theory and a simulation model. The advantage of the proposed method is that the control system of the generator can be simply built, but it functions effectively. The generator voltage always coincides with the grid voltage, even when the grid voltage and the rotor speed are changed, and the reactive and active power of the generator fed into the grid can be separately controlled.

A Novel Method for Excitation Control of DFIG Connected to the Grid on the Basis of Similar Signals from Rotor

2013 ◽  
Vol 336-338 ◽  
pp. 1153-1160 ◽  
Author(s):  
Nguyen Trong Thang ◽  
Nguyen Tien Ban ◽  
Nguyen Thanh Hai
Keyword(s):  
Reactive Power ◽  
Induction Machine ◽  
Doubly Fed Induction Generator ◽  
Excitation Control ◽  
Power Station ◽  
Active And Reactive Power ◽  
Doubly Fed Induction Machine ◽  
Novel Method ◽  
Doubly Fed ◽  
Small Capacity

This paper proposes a novel technique for the new excitation control of the doubly-fed induction generator (DFIG) on power-station which connected to the grid. That is using the similar signals from rotor of a small capacity doubly-fed induction machine (DFIM) as a base to generate the control signals for the former DFIG. Based on this method, a simple but effective controller is designed, which ensures to decouple the active and reactive power supplied to the grid by using two separate parameters Kp and Kq. The advantage of this method is that it is simple but still effective.

scholarly journals Simulation Studies of Control Systems for Doubly Fed Induction Generator Supplied by the Current Source Converter

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1511
Author(s):  
Paweł Kroplewski ◽  
Marcin Morawiec ◽  
Andrzej Jąderko ◽  
Charles Odeh
Keyword(s):  
Feedback Linearization ◽  
Reactive Power ◽  
Current Source ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Generator System ◽  
Scalar Form ◽  
Active And Reactive Power ◽  
Current Source Converter ◽  
Doubly Fed

The control system for a Doubly Fed Induction Generator (DFIG) supplied by a grid-connected Current Source Converter (CSC) is presented in this paper. Nonlinear transformation of DFIG model to the multi-scalar form is proposed. The nonlinear control strategy of active and reactive power of DFIG is realized by feedback linearization. In the proposed control scheme, the DFIG model and CSI parameters are included. Two Proportional-Integral (PI) controllers are dedicated for the control of the respective active and reactive powers. The control variables are the dc-link input voltage vector and the angular speed of the inverter output current. The proposed control approach is characterized by satisfactional dynamics and provides enhanced quality of the power transferred to the grid. In the simulation, evaluation of the characteristic operating states of the generator system, correctness of the feedback linearization and the dynamics of active and reactive power control loops are studied. Simulation results are adequately provided.

scholarly journals Performance Analysis of a Full Order Sensorless Control Adaptive Observer for Doubly-Fed Induction Generator in Grid Connected Operation

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1254
Author(s):  
Gianluca Brando ◽  
Adolfo Dannier ◽  
Ivan Spina
Keyword(s):  
Sensorless Control ◽  
Estimation Error ◽  
Position Estimation ◽  
Adaptive Observer ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Rotor Position ◽  
Stator Flux ◽  
Doubly Fed ◽  
Rotor Position Estimation

This paper focuses on the performance analysis of a sensorless control for a Doubly Fed Induction Generator (DFIG) in grid-connected operation for turbine-based wind generation systems. With reference to a conventional stator flux based Field Oriented Control (FOC), a full-order adaptive observer is implemented and a criterion to calculate the observer gain matrix is provided. The observer provides the estimated stator flux and an estimation of the rotor position is also obtained through the measurements of stator and rotor phase currents. Due to parameter inaccuracy, the rotor position estimation is affected by an error. As a novelty of the discussed approach, the rotor position estimation error is considered as an additional machine parameter, and an error tracking procedure is envisioned in order to track the DFIG rotor position with better accuracy. In particular, an adaptive law based on the Lyapunov theory is implemented for the tracking of the rotor position estimation error, and a current injection strategy is developed in order to ensure the necessary tracking sensitivity around zero rotor voltages. The roughly evaluated rotor position can be corrected by means of the tracked rotor position estimation error, so that the corrected rotor position is sent to the FOC for the necessary rotating coordinate transformation. An extensive experimental analysis is carried out on an 11 kW, 4 poles, 400 V/50 Hz induction machine testifying the quality of the sensorless control.

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