Sub-Synchronous Oscillation Characteristics and Analysis of Direct-Drive Wind Farms With VSC-HVDC Systems

Shao, Bingbing; Zhao, Shuqiang; Yang, Yongheng; Gao, Bin; Blaabjerg, Frede

doi:10.1109/tste.2020.3035203

Cited by 47 publications

(18 citation statements)

References 43 publications

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“…Since large-scale offshore wind farms (OWFs) are distant from onshore grids, high-voltage alternating current transmission becomes technologically unapplicable due to its high capacitive charge, whereas voltage source converter-based HVDC (VSC-HVDC) transmission technology for OWFs is favoured by virtue of its offshore grid-forming capability and high control flexibility etc. [3,4].…”

Section: Introductionmentioning

confidence: 99%

Supercapacitor‐based coordinated synthetic inertia scheme for voltage source converter‐based HVDC integrated offshore wind farm

Zhu,

Shi,

et al. 2024

IET Energy Syst Integration

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A supercapacitor‐based coordinated synthetic inertia (SCSI) scheme for a voltage source converter‐based HVDC (VSC‐HVDC)‐integrated offshore wind farm (OWF) is proposed. The proposed SCSI allows the OWF to provide a designated inertial response to an onshore grid. Under the SCSI scheme, a supercapacitor is added to the DC side of each wind turbine generator via a bidirectional DC/DC converter, varying its voltage along with the offshore frequency to synthesise the desired inertial response. The HVDC grid side VSC employs a DC voltage/frequency droop control to convey the onshore frequency information to DC voltage without communication. Meanwhile, the wind farm side VSC regulates the offshore frequency to couple with the conveyed onshore frequency, considering voltage drop across the DC cables. An offshore frequency switching algorithm is incorporated to avoid undesired SCSI maloperation under offshore faults. The key parameters of the proposed SCSI are optimised through a small signal stability analysis. The effectiveness of the SCSI scheme is evaluated using a modified IEEE 39‐bus test system. The results show that the proposed SCSI scheme can provide required inertial support from WTG‐installed supercapacitors to the onshore grid through the VSC‐HVDC link, significantly improving the onshore frequency stability.

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Section: Introductionmentioning

confidence: 99%

Supercapacitor‐based coordinated synthetic inertia scheme for voltage source converter‐based HVDC integrated offshore wind farm

Zhu,

Shi,

et al. 2024

IET Energy Syst Integration

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“…Unlike PV plants, which exclude any rotating parts, wind plants are more prone to be affected by the SSR. In the SSOs literature, wind plants are mainly studied from the following points of view: effects of series compensated transmission lines on mechanical components and converters of wind plants [13–16], effects of voltage source converters (VSCs) and high‐voltage direct current (HVDC) systems on wind plants [17, 18], and effects of wind plant controllers on increasing SSOs in power systems and interactions with other components [19–22]. …”

Section: Introductionmentioning

confidence: 99%

“…• effects of voltage source converters (VSCs) and high-voltage direct current (HVDC) systems on wind plants [17,18], and • effects of wind plant controllers on increasing SSOs in power systems and interactions with other components [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Analysis of sub‐synchronous resonance between DC‐side dynamics of large‐scale PV plants and nearby synchronous generators shaft

Pourheydari

Parniani

Ravanji

2023

IET Generation Trans & Dist

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This paper investigates the dynamic interactions between large-scale PV plants and nearby synchronous generators. To this end, a comprehensive model of a PV plant, including the PV arrays characteristic and their voltage controller, DC/DC converter, DC-link dynamic, DC/AC inverter controllers, and output filter, is obtained. Then, the eigenvalues of the PV plant model are calculated, and it is revealed that the PV plant has a dynamic mode in the sub-synchronous oscillations (SSOs) range. Furthermore, the modal analysis method is employed, and it is shown that the inductance of the DC/DC converter and the DC-link capacitor significantly contribute to the PV sub-synchronous mode. Also, it is shown that this mode oscillations penetrate the grid and increase the risk of sub-synchronous resonance (SSR). Then, the mechanism of dynamic interactions between large-scale PV plants and torsional modes of nearby synchronous generators is revealed. This paper also investigates the required conditions for these interactions and shows that solar irradiation level and the DC-link capacitance are the essential factors that can intensify these interactions.

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“…Refs. [16][17][18][19] constructed a detailed state space model for a direct-drive wind farm, and calculated the eigenvalues and participating factors of the system. They pointed out that the direct-drive wind farm includes multiple oscillation modes ranging from low to high frequency and that the difference between the states of the generators may affect the validity of stability assessment of the wind farm.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis for sub‐synchronous oscillations in multi‐DFIGs connected system considering the interaction between generators

Shen,

Ma,

Zhao

2023

IET Renewable Power Gen

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In order to reveal the multi‐DFIGs interaction mechanism in DFIG wind farms (DFIG‐WFs), this paper proposes a method based on dynamic energy flow path for stability analysis of sub‐synchronous oscillations in multi‐DFIGs connected system. First, the detailed dynamic energy model of DFIG‐WFs is established considering the inter‐DFIGs coupling effect, and the energy flow paths among multi‐DFIGs are revealed. From this, the interaction energy coefficient is defined to describe the effect of multi‐DFIGs interaction on the system stability, which can be divided into two items: the inter‐DFIGs induction coefficient and the inter‐DFIGs circulation coefficient. On this basis, how the differences in the parameters affect these coefficients are analysed. In this way, the effects of multi‐DFIGs interaction on the oscillation are clarified. Finally, a wind farm model is built in RT‐LAB for simulation verification. The results show that, the changes in DFIG parameters may have mutually exclusive effects on the two coefficients. When the parameters of DFIGs differ greatly, the circulation effect is dominant, which is mainly determined by the difference between DFIGs. If the parameters of DFIGs are similar to each other, the induction effect is dominant and the influence law of parameters is consistent with that of single equivalent model.

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Sub-Synchronous Oscillation Characteristics and Analysis of Direct-Drive Wind Farms With VSC-HVDC Systems

Cited by 47 publications

References 43 publications

Supercapacitor‐based coordinated synthetic inertia scheme for voltage source converter‐based HVDC integrated offshore wind farm

Supercapacitor‐based coordinated synthetic inertia scheme for voltage source converter‐based HVDC integrated offshore wind farm

Analysis of sub‐synchronous resonance between DC‐side dynamics of large‐scale PV plants and nearby synchronous generators shaft

Stability analysis for sub‐synchronous oscillations in multi‐DFIGs connected system considering the interaction between generators

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