Voltage Sag Response of PWM Inverters for Variable-Speed Wind Turbines

Ottersten, Rolf; Petersson, Andreas; Pietiläinen, Kai

doi:10.1080/09398368.2006.11463607

Cited by 15 publications

(18 citation statements)

References 3 publications

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“…For the first case, the wind turbine should remain connected to the grid and in the second the safety measures should be activate to safeguard the integrity of the devices of the wind turbine. To minimise this problem, techniques based in Voltage Source Converters, [12], and Pulse Width Modulation, [13], have been developed.…”

Section: Voltage Dips Literature Reviewmentioning

confidence: 99%

Computation of reactive power in the framework of the new Spanish grid code using test fields of wind turbines submitted to voltage dips

Gomez¹,

Fuentes²,

Molina³

et al. 2007

REPQJ

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Abstract-This paper is focused on the computation of the reactive power generated by wind turbines when they are submitted to a voltage dip in the framework of the new Grid Codes. Taking advantage of the voltage dips field tests carried out to the Gamesa G80 wind turbines, several definitions of reactive power are calculated and the results obtained for a representative three-phase voltage dip test are presented.

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Section: Voltage Dips Literature Reviewmentioning

confidence: 99%

Computation of reactive power in the framework of the new Spanish grid code using test fields of wind turbines submitted to voltage dips

Gomez¹,

Fuentes²,

Molina³

et al. 2007

REPQJ

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“…Therefore, except the grid side converter and its controller, all other controllers and elements of a PMSG can be neglected for simplification. In addition, the grid side converter has rapid current control loop, which is able to achieve a current rise time of only 3 ms [22], so the control process of the current control loop can be ignored too for further simplification. The grid side converter thus no longer needs to be modeled.…”

Section: Introductionmentioning

confidence: 99%

“…The impact of PMSG-based wind power penetration on an existing power system, especially the system transient stability, must be examined carefully [6]. There is some In addition, the grid side converter has rapid current control loop, which is able to achieve a current rise time of only 3 ms [22], so the control process of the current control loop can be ignored too for further simplification. The grid side converter thus no longer needs to be modeled.…”

Section: Introductionmentioning

confidence: 99%

Impact Study of PMSG-Based Wind Power Penetration on Power System Transient Stability Using EEAC Theory

Liu

et al. 2015

Energies

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Abstract:Wind turbines with direct-driven permanent magnet synchronous generators (PMSGs) are widely used in wind power generation. According to the dynamic characteristics of PMSGs, an impact analysis of PMSG-based wind power penetration on the transient stability of multi-machine power systems is carried out in this paper based on the theory of extended equal area criterion (EEAC). Considering the most severe PMSG integration situation, the changes in the system's equivalent power-angle relationships after integrating PMSGs are studied in detail. The system's equivalent mechanical input power and the fault period electrical output power curves are found to be mainly affected. The analysis demonstrates that the integration of PMSGs can cause either detrimental or beneficial effects on the system transient stability. It is determined by several factors, including the selection of the synchronous generators used to balance wind power, the reactive power control mode of PMSGs and the wind power penetration level. Two different simulation systems are also adopted to verify the analysis results.

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“…As network interface, the use of back-to-back converters for variable speed operation is extensively reported in the literature (6)- (8) showing their capability to achieve maximum energy capture in a wide range of wind conditions. There is however little reference to the control of back to back converters for low voltage ride-through capability of wind farms connected to the network (9) (10) . In this paper we analyze an electrical system for wind turbines with cage induction generators interfaced to the grid with back to back converters, and experimentally evaluate the ride through capability under short circuit in the power system for different setting conditions of the converters.…”

Section: Introductionmentioning

confidence: 99%

Robust Wind Turbine System Against Voltage Sag with Induction Generators Interfaced to the Grid by Power Electronic Converters

et al. 2006

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The emergence of new grid codes will pose wind turbine developers a new challenge: the ride through capability during voltage sags. This means that with a high penetration of wind power in the network, the wind turbines/wind farms should be able to continuously supply the network during voltage sags. One of such grid code voltage sag profile for ride through is shown in Fig. 1 for illustration. These new grid codes which are in progress both in Norway and several other countries will most likely influence the type of electrical system (generator and network interface) of future wind turbines. To cope with this new challenge several industries have already initiated research efforts oriented at developing ride through capability technology.Among the technology choices, squirrel cage induction machines are a very attractive choice for wind power generation because they are robust, inexpensive and have low maintenance requirement and cost. As network interface, the use of back-to-back converters for variable speed operation is extensively reported in the literature showing their capability to achieve maximum energy capture in a wide range of wind conditions. There is however little reference to the control of back to back converters for low voltage ride-through In this paper we analyze an electrical system for wind turbines with cage induction generators interfaced to the grid with back to back converters, and experimentally evaluate the ride through capability under a symmetrical short circuit in the power system.A 55 kW motor-generator set of squirrel cage induction machines with a wind emulator to control the torque is used as model for the wind farm. This set-up is connected to the grid through back to back converters, as schematically shown in Fig. 2. The rating of the machines used in this experiment is of relevance in this paper because at this rating the p.u. values are close to those of real wind turbines and thus the performance is representative of real cases.The purpose of this experiment is to evaluate the role of the power electronics converter as a grid interface under short circuit conditions for the most common and inexpensive type of generator: the squirrel cage induction generator. Standard vector control techniques are implemented, aimed at keeping the DC link voltage constant to ensure power balance during the short circuit. Experimental results show a very stiff DC link control which proves the robustness of the back to back converters against voltage sags. MemberBjarne Naess * Non-memberWilliam Gullvik * Non-memberTore Undeland * Non-member An electrical system for wind turbines using cage induction generator with back to back converters for connection to the network is experimentally tested under short circuit conditions in a 55 kW generator set-up. 50% voltage sag is realized in the laboratory set-up to investigate the performance of the power electronic converters control under the newly introduced grid codes. Standard vector control techniques are implemented with the aim to maintain bal...

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Voltage Sag Response of PWM Inverters for Variable-Speed Wind Turbines

Cited by 15 publications

References 3 publications

Computation of reactive power in the framework of the new Spanish grid code using test fields of wind turbines submitted to voltage dips

Computation of reactive power in the framework of the new Spanish grid code using test fields of wind turbines submitted to voltage dips

Impact Study of PMSG-Based Wind Power Penetration on Power System Transient Stability Using EEAC Theory

Robust Wind Turbine System Against Voltage Sag with Induction Generators Interfaced to the Grid by Power Electronic Converters

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