scholarly journals Starting of induction motor fed with stand-alone DFIG

2021 ◽  
Vol 10 (5) ◽  
pp. 2414-2423
Author(s):  
M. Sharawy ◽  
Adel A. Shaltout ◽  
Naser Abdel- Rahim ◽  
Mahmoud A. Al-Ahmar ◽  
O. E. M. Youssef
Keyword(s):  
Voltage Sag ◽  
Doubly Fed Induction Generator ◽  
System Behavior ◽  
Starting Current ◽  
Start Up ◽  
On Line ◽  
Indirect Field Oriented Control ◽  
Doubly Fed ◽  
Rotor Side Converter ◽  
And Control

This paper presents dynamic simulation and control of stand-alone doubly fed induction generator (DFIG) loaded with 3-phase induction motors (IMs). The study reveals that direct on-line starting of large IMs causes a large voltage sag across the generator terminals as the starting current drawn reaches up to 8-9 times the rated load current. Traditionally, this problem has tackled by oversizing of the generator or employment of special starters, under the pretext of mitigating voltage sag. This work explores ways that the starting current can be reduced economically by applying constant V/f control side by side with indirect field-oriented control (FOC) applied on the rotor side converter of the DFIG. This methodology enables starting of larger IMs and mitigation of voltage sag that occurs during the start-up period. Two different rating of IMs loaded with speed-squared mechanical torque are mainly considered. Simulation results of the system behavior under study confirm the capability of the proposed control.

Improved Control Strategy of Wind Turbine with DFIG for Low Voltage Ride through Capability

2014 ◽  
Vol 707 ◽  
pp. 329-332
Author(s):  
Li Ling Sun ◽  
Dan Fang
Keyword(s):  
Wind Turbine ◽  
Control Strategy ◽  
Low Voltage ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Operating Characteristics ◽  
Low Voltage Ride Through ◽  
Doubly Fed ◽  
Rotor Side Converter ◽  
And Control

As the number of doubly fed induction generator (DFIG)- based wind-turbine systems continues to increase, wind turbines are required to provide Low Voltage Ride-Through (LVRT) capability, especially under the condition of grid voltage dips. This paper, depending on the operating characteristics of doubly-fed induction generator during grid faults ,deals with a protection and control strategy on rotor-side converter (RSC) to enhance the low voltage ride through capability of a wind turbine driven doubly fed induction generator (DFIG). The simulation and experiment studies demonstrate the correctness of the developed model and the effectiveness of the control strategy for DFIG-based wind-turbine systems under such adverse grid conditions.

Sequencing Batch Reactors - An Overview

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2523-2526 ◽  
Author(s):  
K. L. Norcross
Keyword(s):  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Process Selection ◽  
Wastewater Treatment Process ◽  
Industrial Sites ◽  
Pharmaceutical Manufacturers ◽  
Start Up ◽  
On Line ◽  
Oxygen Requirements ◽  
And Control

Sequencing Batch Reactors (SBR's) offer many advantages and few disadvantages to the wastewater treatment process selection. Due to the relatively recent surge of interest in SBR's, few plants have been on-line long enough for Engineers to have developed a thorough understanding of all design aspects and considerations. The author has been involved directly in the design, equipment supply, start-up and operation of almost 60 SBR's of all sizes. About two thirds of the installations are municipal and one-third of these installations are industrial sites involving wastes from food processors, dairies, distilleries, petro-chemical manufacturers, landfill leachate, tanneries, Government munition plants and pharmaceutical manufacturers. The control of filamentous bulking has also been excellent with SBR's. This paper will consider the mechanical, process and control aspects for design of an SBR. The mechanical aspects will include HRT and basin sizing, selection of aeration equipment and effluent decanters. The process parameters discussed will include loading rates and F:M considerations, MLSS concentration, oxygen requirements and D.O. uptake rate, flow proportional aeration, the benefits of an anoxic fill cycle, and finally, nutrient removal. Control considerations are briefly discussed.

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