Sub‐synchronous oscillations in wind farms – an overview study of mechanisms and damping methods

Shi, Tong; Nayanasiri, Dulika; Li, Yunwei

doi:10.1049/iet-rpg.2020.0479

Cited by 10 publications

(5 citation statements)

References 83 publications

(184 reference statements)

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“…As a result, the electric utility grids have experienced numerous abnormal situations with the wind power plants [20][21][22][23][24][25]. From 2012 to 2014, the Guyuan wind farm in China recorded 58 times subsynchronous oscillation (SSO) phenomena that damaged the electric power facilities [20].…”

Section: Variable Grid Conditionmentioning

confidence: 99%

Exploring Dynamic P-Q Capability and Abnormal Operations Associated with PMSG Wind Turbines

Rahman

Das

et al. 2023

Energies

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With the proliferation of large-scale grid-connected wind farms, subsynchronous oscillation (SSO) incidents associated with Type-4 wind turbines (WTs) with a permanent magnet synchronous generator (PMSG) have occurred frequently. These incidents have caused severe reliability risks to the power grid. Conventionally, P-Q capability charts are utilized to ensure the safety operating region of a synchronous generator. However, a PMSG WT exhibits completely different and dynamic P-Q capability characteristics due to the difference in energy conversion technique and several critical factors related to the WT power converters. This paper presents a comprehensive dynamic P-Q capability study of a PMSG WT with sufficient and accurate considerations of the WT control and operation in the dq reference frame, its power converter constraints, and grid dynamics. Models of a PMSG WT are first developed based on its control principle in the dq reference frame. Then, algorithms for obtaining the P-Q capability charts of the WT are developed with the considerations of complete WT constraints in different aspects. The study analyzes the root cause of many abnormal operations of grid-connected PMSG WTs, reported in the literature, from the dynamic P-Q capability perspectives. The proposed study is verified via an electromagnetic transient (EMT) model of a grid-connected Type-4 WT.

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Section: Variable Grid Conditionmentioning

confidence: 99%

Exploring Dynamic P-Q Capability and Abnormal Operations Associated with PMSG Wind Turbines

Rahman

Das

et al. 2023

Energies

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“…The impedance transfer function can be obtained using the internal information of the grid-connected inverter. This type of impedance modelling method is called white-box modelling [20], and its results are expressed as follows: (1) where ah (h=1, 2, …, a) and a are the coefficient and highest degree of the non-zero denominator polynomial, respectively; bh (h = 1, 2, …, b) is the coefficient of molecular polynomial with the highest degree b. J = max{a, b} denotes the order of transfer functions.…”

Section: Fig 1 Topology Of An Lcl Grid-connected Invertermentioning

confidence: 99%

“…Stability analysis approaches for a multi-inverterfed power system should adapt to the replacement of synchronous generators in traditional power systems by clean, inverter-based resources [1]. Unstable accidents, such as those induced by the coupling between grids and grid-connected inverters (GCIs), have been reported [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Grey Box Method for the Stability Analysis of Multi-Inverter-Fed Power Systems using Bode Diagrams

LI,

Wu,

et al. 2023

Preprint

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A multi-inverter-fed power system is susceptible to small-signal instability owing to weak grid influence. Using the impedance-frequency (IF) method to analyse system stability at engineering sites has the following limitations: 1) The internal information of a grid-connected inverter is unknown because of technical confidentiality. Thus, its impedance model should fit in a grey box. 2) The IF method defaults to the subsystem aggregation impedance without right-half-plane (RHP) poles, which may result in incorrect stability analysis. 3) The data used for drawing the IF curve should be calculated per frequency, which is time-consuming. To address these limitations, this study proposes a grey box method for small-signal stability analysis of a multi-inverter-fed power system based on Bode diagrams. First, grey box impedance fitting for a single grid-connected inverter and impedance aggregation for a multi-inverter-fed power system are discussed. Second, the principle of the proposed method is elaborated. Using the Bode diagram, the number of RHP poles of the aggregated impedance and actual number of circles for Nyquist curves are identified. Third, a multi-inverter-fed power system is constructed, and the effectiveness of the proposed method is verified using case analysis and hardware-in-the-loop real-time experiments based on RT-LAB. Finally, the advantages of the proposed method are revealed by comparing it to the IF method.

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“…Stability analysis approaches for a multi-inverter-fed power system should adapt to the replacement of synchronous generators in traditional power systems by clean, inverter-based resources [1]. Unstable problems, such as those induced by the coupling between grids and grid-connected inverters (GCIs), have been analysed [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A black‐box method for the stability analysis of multi‐inverter‐fed power systems using Bode diagrams

Li,

Wu,

et al. 2024

IET Generation Trans & Dist

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A multi‐inverter‐fed power system is susceptible to small‐signal instability owing to weak grid influence. This study proposes a black‐box method for small‐signal stability analysis of a multi‐inverter‐fed power system based on Bode diagrams. Not only did it consider the technical confidentiality on the engineering site, but it also took into account the presence of right‐half‐plane (RHP) pole in the aggregated impedance, achieving Nyquist circle acquisition through Bode diagrams. The stability analysis process is thus more accurate, intuitive, and convenient. First, black‐box impedance fitting for a single grid‐connected inverter and impedance aggregation for a multi‐inverter‐fed power system are discussed. Second, the principle of the proposed method is elaborated. Using the Bode diagram, the number of RHP poles of the aggregated impedance and actual number of circles for Nyquist curves are identified. Third, a multi‐inverter‐fed power system is constructed, and the effectiveness of the proposed method is verified using case analysis and hardware‐in‐the‐loop real‐time experiments based on RT‐LAB. Finally, the advantages of the proposed method are revealed by comparing it to the IF method.

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Sub‐synchronous oscillations in wind farms – an overview study of mechanisms and damping methods

Cited by 10 publications

References 83 publications

Exploring Dynamic P-Q Capability and Abnormal Operations Associated with PMSG Wind Turbines

Exploring Dynamic P-Q Capability and Abnormal Operations Associated with PMSG Wind Turbines

A Grey Box Method for the Stability Analysis of Multi-Inverter-Fed Power Systems using Bode Diagrams

A black‐box method for the stability analysis of multi‐inverter‐fed power systems using Bode diagrams

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