Equivalent modelling of wind farm for small‐signal stability analysis in weak power system

He, Xiuqiang; Geng, Hua; Yang, Geng; Zou, Xin; Li, Yanan

doi:10.1049/joe.2017.0559

Cited by 6 publications

(6 citation statements)

References 9 publications

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“…According to (5), the steady-state equilibrium point of the VSC system satisfies the condition that (11) Several examples of the equilibrium point are depicted in Fig. 5, where there are two types of zero-crossing points.…”

Section: A Steady-state Equilibrium Point Analysismentioning

confidence: 99%

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Transient Stability Analysis of Grid-Tied Converters Considering PLL’s Nonlinearity

Geng

2019

CPSS TPEA

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Transient instability events of grid-tied converters probably occur while riding through grid faults. During lowvoltage ride through (LVRT) period, seeing from the converter terminal towards the grid, the Thévenin equivalent grid impedance becomes pretty significant, accordingly making the converter terminal voltage highly sensitive to the output current. Under such circumstances, it is challenging for the converter to resynchronize with the grid via a phase-locked loop (PLL). This paper develops a reduced-order nonlinear model to elaborate on the dynamic synchronization characteristic of the converters. By considering the impact of grid impedance and analysing spatial vector tracking relation, resynchronization principle of the converters during LVRT is revealed. Besides, the impacts of circuit parameters and controller parameters, including residual grid voltage, grid impedance, current references, and PLL parameters, on the transient stability of the converters are investigated. The results are verified by simulation and experimental results. Index Terms-Grid fault, low voltage ride through, phase-locked loop, power converter, synchronization, transient stability. I. IntroductIonG RID-TIED power converters are playing increasingly important roles in power systems, along with the rapid development of renewable power generation in recent years. Three-phase voltage source converters (VSCs), as one of the most crucial components of renewable energy generation units, often offer quite different performance from the conventional synchronous generator units, such as outstanding rapidity and controllability, but limited fault ride through capability [1], [2]. Grid codes for renewable power generation, in which various facets of the operating characteristics of grid-tied renewable energy generation units are standardized, have been formulated by independent system operators in order to ensure the power system security and stability [2]-[4]. One of the grid codes, namely low-voltage ride through (LVRT) requirement, requires renewable energy generation units to remain connected to the Manuscript received January 25, 2019.

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Section: A Steady-state Equilibrium Point Analysismentioning

confidence: 99%

“…Therefore the nonlinearity in system components, especially PLL's nonlinearity, cannot be neglected in the stability assessment. In this regard, previous relevant small-signal stability studies of the VSCs [8]- [11] can not effectively address the transient stability issues.…”

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confidence: 99%

Transient Stability Analysis of Grid-Tied Converters Considering PLL’s Nonlinearity

Geng

2019

CPSS TPEA

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“…However, time-domain simulations cannot clearly reveal all oscillation modes and their manifestations. Thus, the simulations cannot be used to evaluate the effectiveness of the equivalent models in small-signal stability analysis, and then guidelines for future equivalence cannot be proposed properly [32]. Moreover, the simulations at the PCC cannot reflect the dynamic interactions among WTGs.…”

Section: Introductionmentioning

confidence: 99%

“…In light of this, the small-signal stability analysis was performed to evaluate the wind farm equivalent models [12], [13], [24], [32]- [39]. To estimate the equivalent parameters of DFIG wind farms, an aggregation technique consisting of a hybrid algorithm was proposed by using the measurement data from phasor measurement units (PMUs) [33].…”

Section: Introductionmentioning

confidence: 99%

“…Based on the impedance analysis method, the DFIG and PMSG models were simplified into impedance models, and then aggregated impedance models were proposed to investigate the sub-synchronous oscillation (SSO) of wind farms [36], [37], where the impedance characteristics analysis was performed to evaluate the aggregated impedance models. To facilitate the small-signal stability analysis of wind farms, three equivalent methods were proposed by modal participation factor aggregation criterion [32], equivalent state variables transformation [12], and similarity transformation theory [13].…”

Section: Introductionmentioning

confidence: 99%

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Adequacy of the Single-Generator Equivalent Model for Stability Analysis in Wind Farms With VSC-HVDC Systems

Shao

Zhao

Gao

et al. 2021

IEEE Trans. Energy Convers.

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Due to the complexity of detailed models, the single-generator equivalent model (SEM) of a wind farm is commonly used to facilitate the stability analysis. However, the adequacy of the SEM for stability analysis in direct-drive wind farms with VSC-HVDC systems is still uncertain. Therefore, this paper analyzes the SEM adequacy in two aspects: the oscillation modes analysis and the sub-synchronous oscillation (SSO) stability enhancement by optimizing wind farm parameters. Firstly, various critical oscillation modes are characterized according to the frequency, and a comparison of these modes between the two-generator equivalent model and the SEM is presented. The effect of single-generator aggregation on the critical oscillation modes is discussed. Then, the impact of permanent magnet synchronous generator (PMSG) parameters on the inside-wind-farm/wind-farm-grid SSO modes is explored. It is revealed that with the change of PMSG parameters, the damping effect of the two SSO modes is identical. This implies that the SEM can be used to improve the SSO stability of the multi-machine system by optimizing the PMSG parameters. PSCAD/EMTDC simulations are further performed to verify the theoretical analysis.

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Dynamic Equivalence Modeling Method for Offshore PMSG Wind Farms Based on Improved R-K Clustering Algorithm

Zhang

Lin

et al. 2021

2021 IEEE 5th Information Technology,Networking,Electronic and Automation Control Conference (ITNEC)

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Equivalent modelling of wind farm for small‐signal stability analysis in weak power system

Cited by 6 publications

References 9 publications

Transient Stability Analysis of Grid-Tied Converters Considering PLL’s Nonlinearity

Transient Stability Analysis of Grid-Tied Converters Considering PLL’s Nonlinearity

Adequacy of the Single-Generator Equivalent Model for Stability Analysis in Wind Farms With VSC-HVDC Systems

Dynamic Equivalence Modeling Method for Offshore PMSG Wind Farms Based on Improved R-K Clustering Algorithm

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