Direct Power Control of Doubly Fed Induction Generator Using Extended Power Theory Under Unbalanced Network

Zhang, Yongchang; Jiao, Jian; Xu, Donglin

doi:10.1109/tpel.2019.2906013

Cited by 51 publications

(21 citation statements)

References 29 publications

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“…Output signals of voltage BPF are used for calculation of stator space voltage vector angle θs, which is next used in the control for frame transformation. Next, based on stator flux ψsαβ, stator voltage usαβ, reference torque Tem ref and reference q component of instantaneous power qs ref , the reference stator current is calculated (20), (21). The obtained reference currents values allow to calculate the reference p component of instantaneous power ps ref according to (34).…”

Section: Direct Power Control Descriptionmentioning

confidence: 99%

“…It implies that an additional controllers which must be then tuned, which is sometimes not a trivial task. A similar approach was presented in [20], where a DPC-SVM method is adopted to unbalance DFIG operation. It uses signal decomposition and allows to obtain good steady state performance and operates with constant p component of instantaneous power.…”

Section: Introductionmentioning

confidence: 99%

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Rotor Current Feedback Based Direct Power Control of a Doubly Fed Induction Generator Operating with Unbalanced Grid

Pura¹,

Iwański²

2021

Energies

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The paper presents a decoupled direct power-controlled (DPC) of a doubly fed induction generator (DFIG) connected to an unbalanced power grid, executed in an orthogonal stationary reference frame related to the stator side. The control allows to maintain constant electromagnetic torque despite stator connection to the unbalanced power grid and to achieve controllable low-voltage ride through (LVRT) capability. The control does not require any signal decomposition into positive and negative sequence order, which allows to reduce its complexity and computational requirements. Then, the paper presents positive influence of rotor current feedback in the stator-controlled reference frame on control performance. It facilitates significant transient reduction and minor steady state control improvement. All the mentioned functionalities were validated both in simulation and in laboratory conditions and the obtained results are described in the paper.

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Section: Direct Power Control Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotor Current Feedback Based Direct Power Control of a Doubly Fed Induction Generator Operating with Unbalanced Grid

Pura¹,

Iwański²

2021

Energies

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“…To achieve active and reactive power tracking under balanced grid voltage, and also to suppress stator current harmonics and electromagnetic torque ripples under unbalanced grid voltage, a new active power expression is used to track instead of the traditional active expression [18,25,38]. The new active power can be expressed as follows:…”

Section: Model Analysismentioning

confidence: 99%

“…Hence, the control structure is easy to implement, and excellent dynamic performance is achieved [15]. Many modified achievements have been published based on this traditional DPC idea [16][17][18]. However, the switching frequency is unfixed, unacceptable power ripples still exist, and system robustness should be improved [19].…”

Section: Introductionmentioning

confidence: 99%

Adaptive-Gain Second-Order Sliding Mode Direct Power Control for Wind-Turbine-Driven DFIG under Balanced and Unbalanced Grid Voltage

Han

2019

Energies

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In a wind turbine system, a doubly-fed induction generator (DFIG), with nonlinear and high-dimensional dynamics, is generally subjected to unbalanced grid voltage and unknown uncertainty. This paper proposes a novel adaptive-gain second-order sliding mode direct power control (AGSOSM-DPC) strategy for a wind-turbine-driven DFIG, valid for both balanced and unbalanced grid voltage. The AGSOSM-DPC control scheme is presented in detail to restrain rotor voltage chattering and deal with the scenario of unknown uncertainty upper bound. Stator current harmonics and electromagnetic torque ripples can be simultaneously restrained without phase-locked loop (PLL) and phase sequence decomposition using new active power expression. Adaptive control gains are deduced based on the Lyapunov stability method. Comparative simulations under three DPC schemes are executed on a 2-MW DFIG under both balanced and unbalanced grid voltage. The proposed strategy achieved active and reactive power regulation under a two-phase stationary reference frame for both balanced and unbalanced grid voltage. An uncertainty upper bound is not needed in advance, and the sliding mode control chattering is greatly restrained. The simulation results verify the effectiveness, robustness, and superiority of the AGSOSM-DPC strategy.

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“…Harmonics and unbalance in grid voltages introduce unbalance and harmonics in stator currents, harmonics in the rotor currents, and pulsations in the torque and generated power [17,18]. Several publications have addressed these challenges and have come up with control objectives to reduce their effect on the system performance [19].…”

Section: Introductionmentioning

confidence: 99%

Reduced sensor operation and power quality improvement in grid‐tied doubly fed induction generator using composite and twin frequency generalised integrators

Das

Puchalapalli

Singh

2021

IET Renewable Power Gen

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This study presents a strategy involving a reduction in the stator current sensor count for control of power converters, in a doubly fed induction generator (DFIG)‐based wind energy conversion system (WECS). The reduced sensor vector control scheme is effectively used in lieu of the conventional vector control algorithm during sensor failure without any change in the overall control structure. This keeps the system operational in case of sensor failure. The reduced sensor scheme necessitates precise estimation of stator flux amplitude and an orientation angle, for control of power converters under all operating conditions. A composite generalised integrator phase‐locked loop is presented to estimate accurately the stator flux amplitude and orientation angle, even at operating system irregularities such as unbalanced voltages, lower‐order harmonics in the grid voltage, DC bias in sensing circuitry, and so forth, which otherwise lead to distortions in flux and orientation angle. The grid‐side converter control is based on a twin frequency improved second‐order generalised integrator. It enables fast and accurate power quality improvement in DFIG‐based WECS during load and grid abnormalities. A laboratory prototype is developed to validate the control of the system.

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Direct Power Control of Doubly Fed Induction Generator Using Extended Power Theory Under Unbalanced Network

Cited by 51 publications

References 29 publications

Rotor Current Feedback Based Direct Power Control of a Doubly Fed Induction Generator Operating with Unbalanced Grid

Rotor Current Feedback Based Direct Power Control of a Doubly Fed Induction Generator Operating with Unbalanced Grid

Adaptive-Gain Second-Order Sliding Mode Direct Power Control for Wind-Turbine-Driven DFIG under Balanced and Unbalanced Grid Voltage

Reduced sensor operation and power quality improvement in grid‐tied doubly fed induction generator using composite and twin frequency generalised integrators

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