Reactive Power Dispatch Method in Wind Farms to Improve the Lifetime of Power Converter Considering Wake Effect

Tian, Jiaxi; Zhou, Dao; Su, Chi; Chen, Zhe; Blaabjerg, Frede

doi:10.1109/tste.2016.2607146

Cited by 37 publications

(28 citation statements)

References 22 publications

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“…When the output voltage and frequency are located close to their lower limitation values, they can never fall below the lower limitation value so as to limit the voltage and frequency of the system. Thus, the proposed droop control strategy can satisfy the relevant standards better [22][23][24]. With conventional droop control, the frequency and voltage magnitude are always regarded as the cut-off condition.…”

Section: Exponential-function-based Droop Control Strategymentioning

confidence: 99%

Exponential-function-based droop control for islanded microgrids

Wang

Sun

Gui

et al. 2019

J. Mod. Power Syst. Clean Energy

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An exponential-function-based droop control strategy for the distributed energy resources (DERs) is proposed to reduce the reactive power-sharing deviation, limit the minimum value of frequency/voltage, whilst improving the utilization rate of renewable energy. Both DERs and loads are interconnected to achieve a power exchange by converters, where the power management system should accurately share the active/reactive power demand. However, the proportional reactive power sharing often deteriorates due to its dependence on the line impedances. Thus, an exponential-function-based droop control is proposed to À prevent voltage and frequency from falling to the lower restraint,`achieve accurate reactive power sharing,´eliminate communication and improve the usage ratio of renewable energy. Furthermore, its stability is analyzed, and the application in islanded AC/DC hybrid microgrids is investigated to achieve the bidirectional power flow. The simulation and experimental results show that the reactive power sharing deviation can be reduced, and the utilization rate of renewable energy is improved by using the proposed method. Moreover, the simulation results illustrate that the system can maintain stable operation when the microgrid is switched from one supplied energy operation condition to another absorbed one.

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Section: Exponential-function-based Droop Control Strategymentioning

confidence: 99%

Exponential-function-based droop control for islanded microgrids

Wang

Sun

Gui

et al. 2019

J. Mod. Power Syst. Clean Energy

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show abstract

“…As aforementioned, the lifetime of the power converter determines the lifetime of wind turbine system. A flow chart to estimate the lifetime of the power converter in a DFIG wind turbine system is as shown in Figure 4 [32]. At a constant wind speed v, the wind turbine mechanical power Pm and rotor speed ωr are determined by the pitch angle and tip speed ratio according to (1) and (2).…”

Section: Lifetime Estimation Of the Power Convertermentioning

confidence: 99%

Section: Lifetime Estimation Of the Power Convertermentioning

confidence: 99%

“…Finally, the annual damage AD, which is defined as the At a constant wind speed v, the wind turbine mechanical power P m and rotor speed ω r are determined by the pitch angle and tip speed ratio according to (1) and (2). In the case of the RSC the current stress I r and voltage stress V r of the power converter can be calculated by the DFIG model and power converter model with information regarding the generator speed and the active power [32,33]. Then, the power loss dissipation of each IGBT P T and diode P D , both of which consist of the conduction losses and the switching losses, can be calculated with the loss model of the power electronics components [34].…”

Section: Lifetime Estimation Of the Power Convertermentioning

confidence: 99%

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Optimal Control to Increase Energy Production of Wind Farm Considering Wake Effect and Lifetime Estimation

Tian

Zhou

et al. 2017

Applied Sciences

Self Cite

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In a wind farm, the upstream wind turbine may cause power loss to the downstream wind turbines due to the wake effect. Meanwhile, the energy production is determined by the power generation and the lifetime of the wind turbine. In this paper, an optimal active power control method is proposed to maximize the energy production of wind farms by considering the wake effect and the lifetime of wind turbine. It starts with the analysis of the pitch angle curve and active power curve seen from the Maximum Power Point Tracking (MPPT) of individual wind turbines. Taking the wake effect into account, the pitch angle curve and active power curve are optimized with the aim of Maximum Power Generation (MPG) of the wind farm. Afterwards, considering the lifetime of wind turbines, a comparison is offered between the MPPT method and the MPG method for energy production using a simplified two-turbine wind farm as an example. Due to the small range of the effective wake area, it is found that the energy production is almost the same. Finally, the pitch angle curve and active power curve are optimized according to the Maximum Energy Production (MEP) of a wind farm. Upon considering and contrasting the MPPT method and the MEP method, it can be seen that the energy production of wind farms can be increased even in the case of there not being an effective wake area.

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“…Ref. [3] considered the wake effect factor and the action of the blade pitch angle as the classification index for the same WF. However, various operating conditions and the complex properties of wind power, especially wind intermittency and uncertainty, create challenges for these methods.…”

Section: Introductionmentioning

confidence: 99%

A Study of Dynamic Equivalence Using the Similarity Degree of the Equivalent Power Angle in Doubly Fed Induction Generator Wind Farms

et al. 2020

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This paper presents a study of dynamic equivalence for doubly fed wind farms (DFWFs) in large power systems. The core idea is to find an attribute representing the critical characteristics of a doubly fed induction generator (DFIG) and use it for clustering in the equivalent modeling process. Using the voltage and flux linkage equations of DFIGs, we derived an electromagnetic power expression. Similar to the power angle concept for synchronous generators, an equivalent power angle (EPA) is proposed and shown to represent the dynamic characteristics of a DFIG in the test system. We introduce the similarity degree of the EPA based on similarity theory and construct a similarity index of the EPA for clustering a DFWF. A practical algorithm was developed for parameter aggregation of the equivalent model. In addition, a simulation of DFWFs in Yunnan, China, was conducted to show the feasibility and high precision of the proposed method. INDEX TERMS Doubly fed induction generator, equivalent power angle, dynamic equivalent, similarity degree.

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Reactive Power Dispatch Method in Wind Farms to Improve the Lifetime of Power Converter Considering Wake Effect

Cited by 37 publications

References 22 publications

Exponential-function-based droop control for islanded microgrids

Exponential-function-based droop control for islanded microgrids

Optimal Control to Increase Energy Production of Wind Farm Considering Wake Effect and Lifetime Estimation

A Study of Dynamic Equivalence Using the Similarity Degree of the Equivalent Power Angle in Doubly Fed Induction Generator Wind Farms

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