Converter controls and flicker study of PMSG-based grid connected wind turbines

Alaboudy, Ali H. Kasem; Daoud, Ahmed A.; Desouky, S. S.; Salem, Ahmed A.

doi:10.1016/j.asej.2012.06.002

Cited by 86 publications

(54 citation statements)

References 13 publications

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“…where ρ is the air density (1.225 kg/m 3 ), R is the wind turbine blade radius, V is the wind speed (m/s), β is the pitch angle, and power coefficient Cp is dependent on the TSR λ, which is defined as the ratio of the rotational speed and wind speed, expressed as [12]:…”

Section: Variable Speed Wind Turbine Characteristicsmentioning

confidence: 99%

“…During this period, system operators are responsible for regulating the balance between generation and demand [11]. Variable speed operation, which is controlled by the power electronic devices, enables maximum power point tracking (MPPT) control of the wind generators depending on the wind speed without any power reserves, and thus they cannot supply a certain amount of spinning reserve in response to frequency disturbances [12,13]. This control scheme also reduces the power system inertia because of the mechanical decoupling of the turbine rotating mass and the generator in the variable speed wind turbine.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Intelligent Control Method to Improve the Frequency Support Capability of Wind Energy Conversion Systems

2015

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This paper presents a hybrid intelligent control method that enables frequency support control for permanent magnet synchronous generators (PMSGs) wind turbines. The proposed method for a wind energy conversion system (WECS) is designed to have PMSG modeling and full-scale back-to-back insulated-gate bipolar transistor (IGBT) converters comprising the machine and grid side. The controller of the machine side converter (MSC) and the grid side converter (GSC) are designed to achieve maximum power point tracking (MPPT) based on an improved hill climb searching (IHCS) control algorithm and de-loaded (DL) operation to obtain a power margin. Along with this comprehensive control of maximum power tracking mode based on the IHCS, a method for kinetic energy (KE) discharge control of the supporting primary frequency control scheme with DL operation is developed to regulate the short-term frequency response and maintain reliable operation of the power system. The effectiveness of the hybrid intelligent control method is verified by a numerical simulation in PSCAD/EMTDC. Simulation results show that the proposed approach can improve the frequency regulation capability in the power system.

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Section: Variable Speed Wind Turbine Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hybrid Intelligent Control Method to Improve the Frequency Support Capability of Wind Energy Conversion Systems

2015

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“…This section presents dynamic modeling of the PMSG, where all system parameters and variables are in per unit (pu), and positive direction for the stator currents is assumed into the generator. The stator voltages and fluxes in the dq reference frame rotating at angular speed of ω r are given by:

v_{sdq} = R_{s} i_{sdq} + j ω_{r} ψ_{sdq} + \frac{1}{ω_{b}} \frac{d ψ_{sdq}}{dt}

\begin{matrix} lefttrue \\ ψ_{italicsd} = L_{d} i_{italicsd} + ψ_{italicpm} \\ ψ_{italicsq} = L_{q} i_{q} \end{matrix}

where ψ , v , and i represent the flux, voltage, and current, and subscript s denotes the stator quantities. L d and L q are the d and q axes stator inductances, respectively, R s is the stator resistance, ψ pm is the amplitude of the flux linkage in the stator due to permanent magnet in the rotor, ω b is the base angular frequency in rad/s, and ω r is the electrical rotational speed of the generator, where at the steady state is equal to the stator angular frequency, ω s .…”

Section: Modeling Of Pmsgmentioning

confidence: 99%

Mathematical modeling, dynamic response analysis, and control of PMSG‐based wind turbines operating with an alternative control structure in power control mode

Rahimi

2017

Int Trans Electr Energ Syst

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Summary This paper deals with the detailed mathematical modeling, in‐depth stability analysis, and control of PMSG‐based wind turbine (WT), when PMSG works with an alternative control structure. In the alternative control structure, machine‐side converter (MSC) is used for control of the dc‐link voltage and grid‐side converter (GSC) for control of the output power. In this way, full linearized dynamics of the dc‐link model is achieved by using the equivalent current based model of the MSC and GSC. Based on the system detailed linearized representation, it is shown that the dc‐link dynamics is non‐minimum phase with a right half plane (RHP) zero, where the RHP zero depends on operating point and changes under wind speed variation. Hence, due to stability issue, careful considerations are considered for selection of the dc‐link controller parameters, and necessary conditions are proposed to guarantee the closed‐loop system stability at all operating conditions. Then, the dc‐link control system is modified by introducing an auxiliary compensation block which virtually adds a positive damping resistor in parallel with the dc‐link capacitor. Next design considerations for selection of the auxiliary compensation term are proposed, and finally response of the system is examined by the several time domain simulations.

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“…In this case, the generator side power and grid side power must be equal and the change of DC voltage is zero. The DC voltage dynamics can be expressed as [1]: …”

Section: Dc-link Modelmentioning

confidence: 99%

“…The amount of wind energy converted to electrical energy depends on the average yearly wind velocity at the generator site and also on the applied control to extract the maximum available power [1,2]. There are many wind generation schemes, of which the permanent magnet synchronous generator (PMSG) and the doubly-fed induction generator (DFIG) are the most common, particularly in the new MW-size wind turbines [1,2]. PMSG and DFIG incorporate a DC-link with back-to-back dc/ac inverters to interconnect to the grid [3].…”

Section: Introductionmentioning

confidence: 99%

Damping tie line oscillation using permanent magnet wind generators in the Libyan power system

Elhaji

Hatziadoniu

2014

2014 North American Power Symposium (NAPS)

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In this paper we consider the Libyan power system and its two interconnected areas. The interest in this system is because one of its power areas is expected, in the near future, to host a significant quantity of wind turbines to bolster the local conventional generation. A dynamic model is presented in the paper for the two-area system including a detailed aggregate model of the wind generation system and its controls. Simulation results presented in the paper show that certain disturbances including wind velocity changes can potentially give rise to undamped tie line power oscillations. Subsequently, a control method is proposed to deal with these oscillations by utilizing the fast power modulation capabilities of the wind generator dc link. The proposed method uses the energy stored in the dc link capacitors rather than modifying the power output of the wind turbine. Therefore, secondary torsional oscillations introduced from the wind turbine and potential instability can be avoided. Simulation results using the proposed method show that adequate and effective damping is possible without perturbing the operation of the wind turbine.

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Converter controls and flicker study of PMSG-based grid connected wind turbines

Cited by 86 publications

References 13 publications

Hybrid Intelligent Control Method to Improve the Frequency Support Capability of Wind Energy Conversion Systems

Hybrid Intelligent Control Method to Improve the Frequency Support Capability of Wind Energy Conversion Systems

Mathematical modeling, dynamic response analysis, and control of PMSG‐based wind turbines operating with an alternative control structure in power control mode

Damping tie line oscillation using permanent magnet wind generators in the Libyan power system

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