Comparing the Quality of Power Generated from DFIG with Different Types of Rotor Converters

Nashed, Maged N. F.; Eskander, Mona N.

doi:10.4236/jemaa.2012.41004

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…An evaluation of the reliability and effectiveness of the IGBT switches considering short circuit faults was analyzed in (Ma et al, 2015;Reigosa et al, 2015), respectively. A comparative study of power quality improvement for the DFIG system by subjecting the wind generator to various types of rotor converters was presented in (Nashed and Eskander, 2012). It was reported that in the two-level six-step IGBT inverter schemes, the harmonic contents are very high because frequency of switching the switches is low.…”

Section: Introductionmentioning

confidence: 99%

Investigating Variable Speed Wind Turbine Transient Performance Considering Different Inverter Schemes and SDBR

Okedu

Barghash

2021

Front. Energy Res.

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In wind energy applications, voltage source converters are employed to achieve energy conservation. Recently, multilevel converters have been showing promising advantages compared to the traditional 2-level converter scheme, due to the fact that they can overcome certain limitations during transient conditions. This paper investigates the transient performance of variable DFIG-based speed wind turbines taking into account different scheme configurations of the power converter system. The schemes investigated are a 2-level six step IGBT inverter, a parallel interleaved 2-level six step IGBT inverter, and a 3-level IGBT inverter. All schemes were compared during severe three-phase to ground fault at the terminal of the DFIG wind turbine using the conventional Phase Lock Loop (PLL) and a DC-chopper protection. A coordinated approach of improving the performance of all the converter schemes with series dynamic braking resistor (SDBR) was analyzed. Investigation of the best location for the SDBR in the DFIG architecture considering the best switching signal was also carried out. Furthermore, a new control strategy of PLL for the DFIG system was proposed in conjunction with the SDBR scheme for the converter systems. Simulations were carried out in Power System Computer Aided Design and Electromagnetic Transient Including DC (PSCAD/EMTDC). The results show that the proposed PLL and SDBR hybrid scheme in the various inverter topologies considered in the study can enhance the performance of the wind generator variables during severe three-phase to ground fault. This is because the proposed hybrid scheme could help to boost the capability of the current and recovery of the wind generator after post-fault scenarios. Also, the voltage source converter leg switched output voltage would be enhanced to maximum change in common mode voltage by the inverter schemes’ modulation of the space vector using the proposed strategy.

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Section: Introductionmentioning

confidence: 99%

Investigating Variable Speed Wind Turbine Transient Performance Considering Different Inverter Schemes and SDBR

Okedu

Barghash

2021

Front. Energy Res.

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“…DFIGs fitted with bi‐directional inverters at the rotor side are key components of distributed generation systems and micro‐grids (MGs). The major advantage of variable‐speed DFIGs is that their annual energy capture is about 5% greater than the fixed speed technology [1]. When the wind speed changes, the rotor speed will change, and hence the rotor injection frequency should also be adjusted.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the process becomes complex and computation intensive with increased number of harmonics to be eliminated. The six‐step switching technique [1, 6] is widely used in thyristor‐based inverters in order to reduce the switching losses with a simple control circuit. The six‐step switching technique introduces quasi‐sine AC voltages containing all odd harmonics except triple‐ n harmonics in the rotor line voltage.…”

Section: Introductionmentioning

confidence: 99%

Modified harmonic minimisation technique for doubly fed induction generators with solar‐wind hybrid system using biogeography‐based optimisation

Sarker¹,

Chatterjee

Goswami

2018

IET Power Electronics

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This study develops a framework for optimisation of rotor side converter (RSC) switching to eliminate lower-order harmonic injection of a doubly fed induction generator connected to a grid. A biogeography based optimisation (BBO) technique is used for this purpose. Three level inverters operating in either 120° or 180° modes at slip frequency are usually employed for the RSC to reduce switching losses. Non-sinusoidal rotor injected voltages by RSC generates undesirable stator harmonics based on the operating rotor speed. Induced harmonics in the stator are analysed and computed. A modified switching strategy is developed to reduce stator harmonics at different speeds. A BBO-based technique is used to compute the switching angles off-line controlled with minimum injected harmonics at closed intervals of modulation indices. These angles are stored in processor memory for an on-line application using mixed model equations which have low memory usage. Various simulations are executed and supported by suitable experiments with a practical machine for verification of the proposed model which provided satisfactory results.

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“…In [39, 40], the reliability analysis and robustness of MW level IGBT module under short circuit events were carried out, respectively. Power quality improvement for DFIG system using different types of rotor converters was presented in [41], where it was reported that higher harmonic contents occur with the six‐step 2 level IGBT inverter due to low switching frequency, thus the performance of this type of inverter system is reduced.…”

Section: Introductionmentioning

confidence: 99%

Enhancing DFIG wind turbine during three‐phase fault using parallel interleaved converters and dynamic resistor

Okedu

2016

IET Renewable Power Generation

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Transient operations are very crucial for high power insulated‐gate bipolar transistor modules, because high current and voltage are applied during this period for several microseconds. Therefore, the ability for doubly fed induction generator (DFIG) variable speed wind turbine power converters to withstand abnormal conditions is strictly imperative in order to achieve its lifetime specifications and also fulfil the grid codes. This study presents a new control scheme for DFIG wind turbine having parallel interleaved converters (PIC) configuration and a series dynamic braking resistor (SDBR) connected at its stator side. Interleaving the wind turbine converters in parallel configuration could help to increase the current capability, while the SDBR helps in post fault recovery of the wind turbine. The coordinated control analysis of the scheme was implemented in power system computer aided design and electromagnetic transient including DC simulation environment for a severe three‐phase to ground fault. Results obtained were compared with the conventional DC chopper and crowbar rotor circuit protection scheme for the wind turbine. A better performance of the wind turbine variables were achieved using the proposed control scheme of the PIC and SDBR because the space vector modulation of the PIC results in maximum value of the change in common mode voltage, leading to improved switched output voltage of the voltage source converter leg.

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Comparing the Quality of Power Generated from DFIG with Different Types of Rotor Converters

Cited by 6 publications

References 3 publications

Investigating Variable Speed Wind Turbine Transient Performance Considering Different Inverter Schemes and SDBR

Investigating Variable Speed Wind Turbine Transient Performance Considering Different Inverter Schemes and SDBR

Modified harmonic minimisation technique for doubly fed induction generators with solar‐wind hybrid system using biogeography‐based optimisation

Enhancing DFIG wind turbine during three‐phase fault using parallel interleaved converters and dynamic resistor

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