Coordinated Utilization of Adaptive Inertia Control and Virtual Impedance Regulation for Transient Performance Increase of VSG Under Different Faults

Zhang, Dongyin; Xu, Hanping; Wang, Yicong; Chen, Lei; Li, Yaxin; Hu, Ting

doi:10.1109/acpee51499.2021.9437123

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…However, in the operation process of traditional VSGs, there are a series of overcurrent problems, which can cause system fluctuations and make it difficult to maintain synchronization during grid voltage dips. In [14,15], the respective authors improved the conventional VSG by introducing virtual impedance and proposing an adaptive reference voltage correction method based on virtual impedance for fault current limitation. In addition, an adaptive term is added to the virtual impedance part, which makes the current limiting method applicable to different operation modes of the microgrid, including grid-connected and islanded modes.…”

Section: Introductionmentioning

confidence: 99%

A Stabilization Control Strategy for Wind Energy Storage Microgrid Based on Improved Virtual Synchronous Generator

Huang,

Lin,

Sun

et al. 2024

Energies

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In high-penetration renewable-energy grid systems, conventional virtual synchronous generator (VSG) control faces a number of challenges, especially the difficulty of maintaining synchronization during grid voltage drops. This difficulty may lead to current overloads and equipment disconnections, and it has an impact on the security and reliability of the system, as well as limiting the dynamic reactive power support capability of the system. To solve this problem, in this study, a wind–solar hybrid power generation system is designed with a battery energy storage device connected on the DC side, and proposes a low voltage ride-through (LVRT) control strategy for the grid-connected inverter based on an improved VSG. The control strategy employs an integrated current limiting technique combining virtual impedance and vector current limiting to ensure that the VSG exhibits good dynamic power support characteristics during symmetrical faults by adjusting the setpoint value of reactive power. At the same time, it maintains the synchronization and power angle stability of the VSG itself to achieve the goal of LVRT. Simulation results show that the proposed control strategy can effectively suppress the renewable power fluctuations (about 30% reduction in fluctuations compared to the conventional strategy) and ensure the safe and reliable operation of the renewable energy sources and VSGs during grid-side faults. In addition, it provides a given reactive power support and stable grid voltage control (voltage dips reduced by about 20%), which significantly enhances the LVRT capability of the hybrid wind–solar-storage generation system.

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Section: Introductionmentioning

confidence: 99%

A Stabilization Control Strategy for Wind Energy Storage Microgrid Based on Improved Virtual Synchronous Generator

Huang,

Lin,

Sun

et al. 2024

Energies

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“…For the FRT capability enhancement of a VSC controlled as a VSM, the researchers tend to build a VSM structure with an inner positive sequence Current Control (CC) loop [13][14][15][16][17][18][19][20][21][22][23], or positive and negative (pn) sequence controllers [18,24]. In addition to the use of the current loop, some ancillary controllers have been used to enhance the FRT performance such as virtual impedance [13,15,17,19,20,[25][26][27], current reference saturation [18,[28][29][30][31], and some structures merging both techniques [14,16]. However, some authors reported instabilities regarding the virtual impedance [28,29], and the current reference saturation [20,32].…”

Section: Introductionmentioning

confidence: 99%

New Fault Detection Algorithm for an Improved Dual VSM Control Structure With FRT Capability

Abdel-Rahim¹,

Smailes

Ahmed

et al. 2021

IEEE Access

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Grid forming converters are a promising solution to enhance the stability of electrical networks with a high penetration of renewable generation. Virtual Synchronous Machines (VSM) are a particular type of grid forming converter, which can be implemented without an inner Current Control (CC) loop. This VSM implementation can provide a better inertial response than other grid forming structures with an inner CC. However, it cannot limit the current through the converter during a fault. A standard solution uses a VSM as the primary controller with a conventional inner CC acting as a backup controller during fault conditions, referred to here as a Dual VSM control structure. The switching action between the primary and the backup controllers is dependent on an accurate Fault Detection Algorithm (FDA). The conventional FDA mentioned in the literature has limitations in particular but not uncommon scenarios. The article shows the limitations of the conventional FDA in weak grids and unbalanced conditions and introduces a new FDA with improved performance. Two types of sensitivity analysis are used to study the dynamics of the proposed control approach. The First is the sensitivity of the proposed control structure to different fault locations in strong and weak grids. The Second is the sensitivity of the controller response to changing controller parameters. The second analysis is introduced as a reference for tuning and improvement of the control structure introduced.

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Analysis of An Abnormal Overcurrent Phenomenon of Fault Ride-Through of Virtual Synchronous Generator

Jin

Zhao

Shuai

2021

2021 13th IEEE PES Asia Pacific Power &Amp; Energy Engineering Conference (APPEEC)

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Coordinated Utilization of Adaptive Inertia Control and Virtual Impedance Regulation for Transient Performance Increase of VSG Under Different Faults

Cited by 6 publications

References 13 publications

A Stabilization Control Strategy for Wind Energy Storage Microgrid Based on Improved Virtual Synchronous Generator

A Stabilization Control Strategy for Wind Energy Storage Microgrid Based on Improved Virtual Synchronous Generator

New Fault Detection Algorithm for an Improved Dual VSM Control Structure With FRT Capability

Analysis of An Abnormal Overcurrent Phenomenon of Fault Ride-Through of Virtual Synchronous Generator

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