Direct power control of doubly fed induction generator based on extended power theory under unbalanced grid condition

Zhang, Yongchang; Xu, Donglin

doi:10.1109/ifeec.2017.7992176

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…MPDTC depends in its operation on regulating the torque and rotor flux [55], which can be accomplished by eliminating the difference between the reference and predicted actual torque signals T * e,k+1 and T e,k+1 and between the reference and predicted actual rotor flux signals Ψ * r,k+1 and Ψ sv r,k+1 ; thus, the cost function can be expressed as follows:…”

Section: Mpdtc Techniquementioning

confidence: 99%

“…If the weighting factor is inappropriately selected, the torque and rotor flux ripples are negatively affected. As mentioned in [55], there is a procedure which tried to choose the optimal weighting factor in an online manner, which reduced the deviations in the torque and rotor flux, but unfortunately, the computational burden was affected. Hence, the weighting factor is still a major obstacle to MPDTC.…”

Section: Mpdtc Techniquementioning

confidence: 99%

“…In this section, a robustness test for the proposed PVC and another control scheme recently introduced in [55][56][57][58] which adopts a similar operation mechanism is introduced. The purpose of this is to visualize the superiority of the proposed PVC in terms of system robustness.…”

Section: Testing Under Proposed Pvc With Parameter Variationmentioning

confidence: 99%

“…The d-q voltage references can be obtained using the deadbeat principle. However, considering the deadbeat principle to generate the reference voltages is not a perfect solution as it depends on utilizing the machine physical model, liable to uncertainties, which can result in steady-state offset and oscillatory output [55][56][57][58]. This fact was determined by analyzing the mechanism by which deadbeat control works.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Dynamic Performance of a Variable Speed DFIG for Energy Conversion Purposes Using an Effective Control System

2022

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The present paper aims to introduce an effective control system which enhances the dynamics of a doubly fed induction generator (DFIG) operating at fixed and variable speeds. To visualize the effectiveness of the formulated control algorithm, the performance of the DFIG is evaluated using other control techniques as well. Each control algorithm is primarily described by showing its operation principles and how it is adapted to manage the DFIG’s operation. The main used control strategies are stator voltage-oriented control (SVOC), model predictive current control (MPCC), model predictive direct torque control (MPDTC), and the formulated predictive voltage control (PVC) algorithm. A detailed comparison is performed between the controllers’ performances, through which the advantages and shortcomings of each method are outlined, and finally, the most effective technique is identified amongst them. The obtained results reveal that the proposed PVC approach possesses multiple advantages such as a faster dynamic response and simpler control structure when compared with SVOC and a faster dynamic response, reduced ripples, and reduced computational burdens when compared with the MPCC and MPDTC approaches. In addition, the robustness of the proposed PVC scheme is confirmed by performing extensive performance evaluation tests considering the parameters’ variation.

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Section: Mpdtc Techniquementioning

confidence: 99%

Section: Mpdtc Techniquementioning

confidence: 99%

Section: Testing Under Proposed Pvc With Parameter Variationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improving the Dynamic Performance of a Variable Speed DFIG for Energy Conversion Purposes Using an Effective Control System

2022

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“…The most commonly variable speed constant frequency wind turbine generators (WTGs) can be divided into doubly fed induction generator (DFIG) [1,2] and direct-drive permanent magnet synchronous generator (PMSG) [3,4]. Large-scale application of DFIG was relatively earlier, so the relevant SSO research was carried out more in-depth.…”

Section: Introductionmentioning

confidence: 99%

Sub‐synchronous oscillation in PMSGs based wind farms caused by amplification effect of GSC controller and PLL to harmonics

Cao

2018

IET Renewable Power Generation

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Sub-synchronous oscillation (SSO) caused by direct-drive permanent magnet synchronous generators (PMSGs) occurs frequently in Xinjiang Uygur Autonomous Region, China. As a new type of SSO, the mechanism of power oscillation triggered by PMSGs has not been clarified yet. In this study, a small-signal analysis method was used to investigate the response process of the grid-side converter (GSC) controller and a phase-locked loop (PLL) to harmonics. Components with the same frequency of input disturbance signal and an output signal which generated by response process of controller superpose at the outlet of PMSGs could be amplified by positive feedback. Amplified harmonics will cause sustained power oscillation in sub-synchronous frequency. A criterion for judging dangerous frequencies of SSO was deduced based on phase relation between input and output signals, and the form of output signal was predicted under the condition of certain parameters setting. The theoretical analysis is then validated by the simulation results and the on-site data measured by the phasor measurement unit. Furthermore, the impacts of GSC and PLL parameters on SSO were discussed. This study provides the theoretical basis for SSO mechanism and judgement method in practical engineering. Nomenclature u GSC's voltage v equivalent grid voltage s Laplace operator θ feedback angle of PLL θ c angle of GSC's frame U t0 amplitude of grid-side voltage C capacitor in converter's DC link L, L g equivalent inductance of GSC and grid K pp , K ip parameters of PLL's PI controller K ip , K ii parameters of GSC's PI controller Superscriptŝ value on the α-axis Subscripts ref reference value α reference frame of GSC dq global synchronous coordinates of the system 0 steady-state value

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Recent Trends of Control Strategies for Doubly Fed Induction Generator Based Wind Turbine Systems: A Comparative Review

Karad

Thakur

2019

Arch Computat Methods Eng

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Direct power control of doubly fed induction generator based on extended power theory under unbalanced grid condition

Cited by 5 publications

References 11 publications

Improving the Dynamic Performance of a Variable Speed DFIG for Energy Conversion Purposes Using an Effective Control System

Improving the Dynamic Performance of a Variable Speed DFIG for Energy Conversion Purposes Using an Effective Control System

Sub‐synchronous oscillation in PMSGs based wind farms caused by amplification effect of GSC controller and PLL to harmonics

Recent Trends of Control Strategies for Doubly Fed Induction Generator Based Wind Turbine Systems: A Comparative Review

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