Modeling and Validation of DFIG 3-MW Wind Turbine Using Field Test Data of Balanced and Unbalanced Voltage Sags

Abstract:In recent years, the increasing penetration level of wind energy into power systems has brought new issues and challenges. One of the main concerns is the issue of dynamic response capability during outer disturbance conditions, especially the fault-tolerance capability during asymmetrical faults. In order to improve the fault-tolerance and dynamic response capability under asymmetrical grid fault conditions, an optimal integrated control scheme for the grid-side voltage-source converter (VSC) of direct-driven permanent magnet synchronous generator (PMSG)-based wind turbine systems is proposed in this paper. The optimal control strategy includes a main controller and an additional controller. In the main controller, a double-loop controller based on differential flatness-based theory is designed for grid-side VSC. Two parts are involved in the design process of the flatness-based controller: the reference trajectories generation of flatness output and the implementation of the controller. In the additional control aspect, an auxiliary second harmonic compensation control loop based on an improved calculation method for grid-side instantaneous transmission power is designed by the quasi proportional resonant (Quasi-PR) control principle, which is able to simultaneously restrain the second harmonic components in active power and reactive power injected into the grid without the respective calculation for current control references. Moreover, to reduce the DC-link overvoltage during grid faults, the mathematical model of DC-link voltage is analyzed and a feedforward modified control factor is added to the traditional DC voltage control loop in grid-side VSC. The effectiveness of the optimal control scheme is verified in PSCAD/EMTDC simulation software.

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“…Based on the derivation of transmission power in [27,28], the active and reactive power in grid-side of PMSG during asymmetrical faults are:…”

Section: Compensation Controller To Restrain the Second Harmonic Oscimentioning

confidence: 99%

An Optimal Integrated Control Scheme for Permanent Magnet Synchronous Generator-Based Wind Turbines under Asymmetrical Grid Fault Conditions

Wang

Liu

2016

Energies

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“…In addition to the increase of the d current component, the inverter has to inject reactive current during the fault to meet the FRT requirements. The amount of reactive current is assigned according to the droop control given in (1). Since the d and q current components increase, this may lead the over-current protection to disconnect the inverter from the grid.…”

Section: B Excessive Ac Currentmentioning

confidence: 99%

Notice of Violation of IEEE Publication Principles - Single- and two-stage inverter-based grid-connected photovoltaic power plants with ride-through capability under grid faults

Madhan¹,

Suganthi²

2015

2015 International Conference on Innovations in Information, Embedded and Communication Systems (ICIIECS)

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Grid-connected distributed generation sources interfaced with voltage source inverters (VSIs) need to be disconnected from the grid under: 1) excessive dc-link voltage; 2) excessive ac currents; and 3) loss of grid-voltage synchronization. In this paper, the control of singleand two-stage grid-connected VSIs in photovoltaic(PV) power plants is developed to address the issue of inverter disconnecting under various grid faults. Inverter control incorporates reactive power support in the case of voltage sags based on the grid codes' (GCs) requirements to ride-through the faults and support the grid voltages. A case study of a 1-MW system simulated in MATLAB/Simulink software is used to illustrate the proposed control. Problems that may occur during grid faults along with associated remedies are discussed. The results presented illustrate the capability of the system to ride-through different types of grid faults.Index Terms-DC-DC converter, fault-ride-through, photovoltaic (PV) systems, power system faults, reactive power support.

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“…The controller system produces an optimal pitch angle ref , which from the action of a PI controller. The actuator system can be equal to a first-order dynamic system with a time constant of T , and with a saturation in both amplitude and derivative of the output signal [17].…”

Section: Pitch Control Modelmentioning

confidence: 99%

An electromechanical transient model of direct-driven permanent magnet synchronous generator based wind power system

Wang

Long-yuan

Wang

2014

2014 International Conference on Power System Technology

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This paper proposes a method for an electromechanical transient model of direct-driven permanent magnet synchronous generator (D-PMSG) based wind power system, for analyzing the impact on stability and security of grid power system. The generator, with its converter control system based on dq decoupling strategy, is greatly simplified. And the same goes for the grid side converter and control system. Meanwhile, the dynamic process of DC voltage and braking resistor are taken into account, which reveal the operation characteristic of low voltage ride through process. As for the other parts of D-PMSG, they are established in a mathematical way. Finally, the order of the proposed electromechanical transient model is greatly decreased into eight order. Simulations in the single machine infinite bus system are carried out after all models are established in PSASP UD plat. Simulation results demonstrate that the proposed model can describe the electromechanical transient characteristics of the wind power system. Index Terms-Wind power generation system; direct-driven permanent magnet synchronous generator (D-PMSG); electromechanical transient model.

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Modeling and Validation of DFIG 3-MW Wind Turbine Using Field Test Data of Balanced and Unbalanced Voltage Sags

Cited by 55 publications

References 22 publications

An Optimal Integrated Control Scheme for Permanent Magnet Synchronous Generator-Based Wind Turbines under Asymmetrical Grid Fault Conditions

An Optimal Integrated Control Scheme for Permanent Magnet Synchronous Generator-Based Wind Turbines under Asymmetrical Grid Fault Conditions

Notice of Violation of IEEE Publication Principles - Single- and two-stage inverter-based grid-connected photovoltaic power plants with ride-through capability under grid faults

An electromechanical transient model of direct-driven permanent magnet synchronous generator based wind power system

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