Suppression Strategy of Ultra-Low Frequency Oscillation in Yunnan Power Grid with BESS

Chen, Yixuan; Zhao, Yong; Geng, Guangchao; Jiang, Quanyuan; Liu, Wenlong; Li, Lingfang

doi:10.1109/naps46351.2019.9000236

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Optimised Multi-Band Power System Stabilisers (MBPSS) can improve the damping ratio of the VLF mode [22], [23]. Converter Interfaced Generation (CIG) such as BESS [24] and type-3-windfarms [25] can increase the damping of VLFOs by providing active power out of phase with the measured local frequency deviation.…”

Section: B Literature Reviewmentioning

confidence: 99%

Synchronisation Control Action for Very Low-Frequency Oscillations

Duggan

Brogan

Liu

et al. 2021

2021 32nd Irish Signals and Systems Conference (ISSC)

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Very low-frequency oscillations have been occurring on power grids with a high concentration of hydro generation and islanded grids with a lack of AC interconnection. These oscillations can persist in an ambient form or be triggered by a transient event before growing to the extent that threatens system stability. When a severe event occurs, it is important to identify the cause and have practical control actions to restore power system stability. Firstly, this paper demonstrates that synchronising a generator with a positive damping torque component can restore positively damped conditions. Simulations on a modified 2-Area system are evaluated with DIgSILENT PowerFactory. A transport delay is added to speed feedback of a GAST model governor to simulate a spontaneous negatively damped very-low-frequency oscillation with the appearance of being self-excited after a generation load imbalance. Secondly, a 300 mHz 0.08 Hz very-low-frequency oscillation on the Irish electrical grid is analysed using the governor based distributed energy flow method. Dissipating energy flow is used to illustrate how the synchronisation of 2 generators successfully returned the Irish power system to positively damped conditions.

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Section: B Literature Reviewmentioning

confidence: 99%

Synchronisation Control Action for Very Low-Frequency Oscillations

Duggan

Brogan

Liu

et al. 2021

2021 32nd Irish Signals and Systems Conference (ISSC)

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“…Multi-Band Power System Stabiliser (MBPSS) is proposed in [28], consisting of a band to damp the VLF mode. CIG devices have been shown to improve the damping ratio of VLF oscillations through Battery Energy Storage Systems (BESS) [29] and wind turbines [30] [31]. [32] proposes a wide-area damping control strategy by modulating active power from CIG resources on the power system.…”

Section: Introductionmentioning

confidence: 99%

Very Low-Frequency Oscillation Source Localization on Ireland's Power System

Duggan

Liu

Brogan

et al. 2022

IEEE Open J. Ind. Applicat.

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This paper presents an approach for studying Very Low-Frequency Oscillations (VLFOs) between 0.03 and 0.08 Hz that have been observed on Irelands All-Island transmission system. Previous work by Ireland's TSO has found that the occurrence of the VLFO is linked to the generation dispatch of synchronous machines with governor control. This study verifies previous research by Ireland's TSO and analyses sensitivities such as inertia, system frequency and online generator status that causes an increase in VLF mode magnitude. This paper's results are based on 1-second resolution system frequency, metered generation and power system metric data from 1/1/2018 to 1/10/2020. This analysis demonstrates that the VLF oscillatory mode's stability is highly correlated if governors that consistently provide positive damping torque to the VLF mode are not synchronized. The findings from the study are demonstrated on several events on the Irish system using PMU data. The governor-based dissipating energy flow method is used to validate the relationships found from the generator status and system frequency case study.

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“…high-performance control uses information on current not only to improve performance with feed-forward control, but also to control impedance [22]; • estimating impedance by means of joint voltage and current measurement [23] is used for system protection [24]; • current is measured to identify various transients, such as those caused by series arcs, relevant for both DC distribution [25] and DC railways [26,27]; • inrush and fault current can trigger instability and low frequency oscillations (LFO), and should be limited; similarly high-frequency resonances may also occur, depending on the network extension and the connected devices [28][29][30][31]; • the ripple current is generally considered to estimate stress and aging of grid elements for filtering and storage (e.g., capacitors and batteries) [32][33][34][35][36];…”

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confidence: 99%

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

Mariscotti

2021

Energies

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This work addresses the problem of power quality (PQ) metrics (or indexes) suitable for DC grids, encompassing low and medium voltage applications, including electric transports, all-electric ships and aircrafts, electric vehicles, distributed generation and microgrids, modern data centers, etc. The two main pillars on which such PQ indexes are discussed and built are: (i) the physical justification, so the electric phenomena affecting DC grids and components (PV panels, fuel cells, capacitors, batteries, etc.), causing, e.g., stress of materials, aging, distortion, grid instability; and (ii) the existing standardization framework, pointing out desirable coverage and extension, similarity with AC grids standards, but also inconsistencies. For the first point, each phenomenon is discussed with quantitative conclusions on relevant thresholds: in many cases some percentage of distortion (ripple) is acceptable (stress on capacitors and storage, impact on fuel cells, and PV panels), whereas in other cases, much higher levels may be tolerated (interference to protection and monitoring devices). Standards are reviewed for indications not only of low-order harmonics and voltage fluctuations typical of old DC grid schemes, but also for high-frequency noise, including thus supraharmonics and common-mode disturbance, and filling the gap with the electromagnetic compatibility domain. However, phenomena typical of EMC and electrical safety (such as various types of overvoltages and fast transients) are excluded. Suitable PQ indexes are then reviewed, suggesting integrations and modifications, to cover the relevant phenomena and technological progress, and to better follow the normative exigencies: ripple is considered in time and frequency domain, in particular with a band limited implementation; for transients and pulsed loads, more traditional indexes based on area, energy, and half duration are confronted with indexes evaluating the power trajectory and its derivative.

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Suppression Strategy of Ultra-Low Frequency Oscillation in Yunnan Power Grid with BESS

Cited by 4 publications

References 3 publications

Synchronisation Control Action for Very Low-Frequency Oscillations

Synchronisation Control Action for Very Low-Frequency Oscillations

Very Low-Frequency Oscillation Source Localization on Ireland's Power System

Power Quality Phenomena, Standards, and Proposed Metrics for DC Grids

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