Self-Synchronizing Cascaded Inverters With Virtual Oscillator Control

Lu, Ming–Feng; Dutta, Soham; Johnson, Brian

doi:10.1109/tpel.2021.3134662

Cited by 9 publications

(2 citation statements)

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“…The second aspect is the use of cascaded-type VSGs. A medium or high-voltage system can be formed in the series by connecting low-voltage modules [25][26], such as photovoltaics (PVs) and energy storage devices. A selfsynchronized control scheme was proposed [27] for the cascaded-type power network without requiring communications, allowing for stable operation under resistance-inductance (RL) loads.…”

Section: Introductionmentioning

confidence: 99%

A Decentralized Control With Adaptive Virtual Inertia and Damping Combination for Islanded Cascaded-Type VSG Systems

Li,

Zhou,

Tian

2023

IEEE Access

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With the increase of distributed generations, the problems related to lack of inertia and damping support for cascaded-type power networks are becoming more and more prominent. This may lead to oscillation and even system instability. To address this problem, a decentralized control with adaptive virtual inertia and damping combination method is proposed for islanded cascaded-type virtual synchronous generator (VSG) systems. Firstly, a model of islanded cascaded-type VSGs was developed to analyze the impact of changes in inertia and damping coefficients on frequency characteristics during dynamic processes. Subsequently, a decentralized control was proposed, which employs an adaptive method for regulating inertia and damping coefficients in real-time. The scheme effectively suppresses power and frequency oscillation, leading to improved dynamic frequency performance. Furthermore, this decentralized strategy only requires the local voltage and current measurements, ensuring a fully decentralized implementation. The cascadedtype VSGs demonstrate satisfactory reliability. The stability of the proposed strategy has been demonstrated, and guidelines for designing key control coefficients have been validated through the Lyapunov energy function method. Simulation and experimental results validate the proposed method.INDEX TERMS Cascaded-type VSGs, decentralized control, virtual inertia and damping combination.

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Section: Introductionmentioning

confidence: 99%

A Decentralized Control With Adaptive Virtual Inertia and Damping Combination for Islanded Cascaded-Type VSG Systems

Li,

Zhou,

Tian

2023

IEEE Access

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“…VOC has been shown to operate in series-connected inverters in island mode, for which it offers decentralised synchronisation and control of inverters in a communicationfree approach [124]. A port-Hamiltonian passivity-based VOC method for dealing with unknown grid conditions while ensuring synchronous stability was proposed in [125], satisfying a condition that is necessary for integration with systems of varied SCR values and disturbances.…”

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confidence: 99%

Grid-Forming Control: Advancements towards 100% Inverter-Based Grids—A Review

Ebinyu,

Abdel-Rahim,

Mansour

et al. 2023

Energies

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Changes are being implemented in the electrical power grid to accommodate the increased penetration of renewable energy sources interfaced with grid-connected inverters. The grid-forming (GFM) control paradigm of inverters in active power grids has emerged as a technique through which to tackle the effects of the diminishing dominance of synchronous generators (SGs) and is preferred to the grid-following (GFL) control for providing system control and stability in converter-dominated grids. Therefore, the development of the GFM control is important as the grid advances towards 100% inverter-based grids. In this paper, therefore, we aim to review the changing grid scenario; the behaviour of grid-connected inverter control paradigms and major GFM inverter controls, including their modifications to tackle low inertia, reduced power quality, fault-ride through capability, and reduced stability; and the state-of-the-art GFM models that are pushing the universality of GFM inverter control.

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