Study on the characteristics of low voltage ride through for DFIG based on vector control and direct torque control technology

2019 ◽  
pp. 464-470
Author(s):  
Yi Wan ◽  
Zhe Zhao ◽  
Zhongxiang Li ◽  
Liu Yang ◽  
Chao He ◽  
...  
Keyword(s):  
Vector Control ◽  
Low Voltage ◽  
Direct Torque Control ◽  
Torque Control ◽  
Control Technology ◽  
Low Voltage Ride Through

A 2MW direct drive wind turbine; vector control and direct torque control techniques comparison

2014 ◽  
Vol 25 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Mehdi Allagui ◽  
Othman B.k. Hasnaoui ◽  
Jamel Belhadj
Keyword(s):  
Power Control ◽  
Wind Turbine ◽  
Vector Control ◽  
Reactive Power ◽  
Low Voltage ◽  
Control Strategies ◽  
Direct Torque Control ◽  
Torque Control ◽  
Direct Drive ◽  
Control Techniques

This paper presents a comparative study on the most popular control strategies used to control high power, Direct Drive Wind Turbines. The studied wind turbine is equipped with a supervision scheme in order to fulfil Grid connection requirements (GCR). For the generator-side converter, performances of the Field Oriented Control (FOC) and Direct Torque Control (DTC) are compared. Concerning the grid-side converter, Voltage Oriented Control (VOC) and Direct Power Control (DPC) are examined. The comparison is based on various criteria mainly, steady-state and transient performances. In addition, performances are evaluated in terms of low voltage ride through capabilities (LVRT), power limitation and reactive power control. It has been shown that best power quality features are given by vector control techniques. On the other hand, direct control offers the better dynamic response and power cross-coupling is substantially lower. Furthermore, during fault, the wind turbine does not trip for both techniques. However, vector control is better since it gives low power oscillations

scholarly journals Modeling and Design of the Vector Control for a Three-Phase Single-Stage Grid-Connected PV System with LVRT Capability according to the Spanish Grid Code

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2899 ◽  
Author(s):  
Alexis B. Rey-Boué ◽  
N. F. Guerrero-Rodríguez ◽  
Johannes Stöckl ◽  
Thomas I. Strasser
Keyword(s):  
Vector Control ◽  
Reactive Power ◽  
Low Voltage ◽  
Single Stage ◽  
Photovoltaic System ◽  
Lookup Table ◽  
Voltage Sags ◽  
Pv System ◽  
Low Voltage Ride Through ◽  
Three Phase

This article deals with the vector control in dq axes of a three-phase grid-connected photovoltaic system with single-stage topology and low-voltage-ride-through capability. The photovoltaic generator is built using an array of several series-parallel Suntech PV modules and is modeled as a Lookup Table (two-dimensional; 2-D). The requirements adopted when grid voltage sags occur are based in both the IEC 61400-21 European normative and the allowed amount of reactive power to be delivered according to the Spanish grid code, which avoids the disconnection of the inverter under grid faults by a limitation in the magnitude of the three-phase output inverter currents. For this, the calculation of the positive- and negative-sequences of the grid voltages is made and a conventional three-phase Phase-Locked Loop is used for the inverter-grid synchronization, allowing the control of the active and reactive powers solely with the dq components of the inverter currents. A detailed enhanced flowchart of the control algorithm with low-voltage-ride-through capability is presented and several simulations and experiments using Matlab/SIMULINK and the Controller Hardware-in-the-Loop simulation technique, respectively, are run for several types of one- and three-phase voltage sags in order to validate its behavior.

scholarly journals A Novel Vector Control Strategy for a Six-Phase Induction Motor with Low Torque Ripples and Harmonic Currents

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1102 ◽  
Author(s):  
Hamidreza Heidari ◽  
Anton Rassõlkin ◽  
Toomas Vaimann ◽  
Ants Kallaste ◽  
Asghar Taheri ◽  
...  
Keyword(s):  
Vector Control ◽  
Induction Motor ◽  
Control Strategy ◽  
High Performance ◽  
Direct Torque Control ◽  
Low Frequency ◽  
Torque Control ◽  
Harmonic Currents ◽  
Torque Ripples ◽  
Vector Control Strategy

In this paper, a new vector control strategy is proposed to reduce torque ripples and harmonic currents represented in switching table-based direct torque control (ST-DTC) of a six-phase induction motor (6PIM). For this purpose, a new set of inputs is provided for the switching table (ST). These inputs are based on the decoupled current components in the synchronous reference frame. Indeed, using both field-oriented control (FOC) and direct torque control (DTC) concepts, precise inputs are applied to the ST in order to achieve better steady-state torque response. By applying the duty cycle control strategy, the loss subspace components are eliminated through a suitable selection of virtual voltage vectors. Each virtual voltage vector is based on a combination of a large and a medium vector to make the average volt-seconds in loss subspace near to zero. Therefore, the proposed strategy not only notably reduces the torque ripples, but also suppresses the low frequency current harmonics, simultaneously. Simulation and experimental results clarify the high performance of the proposed scheme.

Torque Control of Stepping Motor Drivers Using Switched Linear Control Technology

2011 ◽  
Vol 58-60 ◽  
pp. 2693-2698 ◽  
Author(s):  
Jian Jun Li
Keyword(s):  
Motor Control ◽  
High Frequency ◽  
Low Voltage ◽  
Torque Control ◽  
Linear Control ◽  
Stepper Motor ◽  
Control Technology ◽  
Control Scheme ◽  
Torque Generation ◽  
Stepper Motor Control

In this paper, a new stepper motor control scheme is proposed based on switched linear control technology for better performance of motor torque generation by using an improved decay-loop and switching between high and low voltage at high frequency. The experimental results demonstrate the effectiveness of the proposed methodology.

Simulation Research of Asynchronous Motor Direct Torque Control System Based on MATLAB

2014 ◽  
Vol 577 ◽  
pp. 364-367
Author(s):  
Guo Hong Li ◽  
Yi Li
Keyword(s):  
Vector Control ◽  
Asynchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Simulation Research ◽  
Startup Time ◽  
Vector Theory ◽  
The Difference ◽  
In Virtue Of ◽  
Excellent Stability

Compared with vector control, direct torque control (DTC) spurned coupling idea and canceled circumgyration coordinates transform. By detecting motor’s stator voltage and current, along with calculating motor’s flux and torque in virtue of the instantaneous space vector theory, DTC controlled flux and torque directly according to the difference between the detecting value and design value. DTC also reduced calculation amount and overcomed the flaw that the system was disturbed by motor’s parameters easily, which were the problems in the vector control. On the basis approach mentioned above, this paper realized the system simulation using DTC. Simulation shows that asynchronous motor control has favorable ability of speed adjusting, short startup time, excellent stability.

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