Research on Pre-Synchronization Control Strategy for Microgrid VSG Inverter

Zhang, Mengxiang; Liu, Minchao; Zheng, Xuemei; Li, Haoyu; Yu, Yanxue; Li, Zhenwei

doi:10.1109/iciea.2019.8834104

Cited by 6 publications

(3 citation statements)

References 6 publications

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“…The detected three-phase voltage and current at the parallel network, ucabc and icabc are Clark-transformed to obtain the components ucαβ and icαβ on the αβ0 coordinate axis. The instantaneous value of the inverter output three-phase voltage, E0, can be obtained from ( 9) and (10)…”

Section: Analysis Of Vsg Nadrc Modelmentioning

confidence: 99%

“…By separating the positive and negative sequence components of voltage, the unbalance of output voltage under unbalanced load condition is reduced. In addition, in the integrated compensation VSG control strategy, the frequency deviation caused by load disturbance is eliminated by the parallel integration compensator on the damping coefficient D [10], which improves the frequency modulation performance of the VSG system and inhibits the power oscillation of the VSG system. However, the experimental results of VSG voltage regulation capability and power quality are lacking.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

Kong,

Zhang,

Zhuolin

et al. 2023

IEEE Access

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In this paper, a nonlinear adaptive disturbance rejection control (NADRC) strategy is designed to overcome the limitations of the traditional virtual synchronous generator (VSG) control method in photovoltaic (PV) grid-connected energy storage systems. This strategy utilizes exact feedback linearization and linear optimal control theory to establish a nonlinear adaptive disturbance rejection control law based on the virtual synchronous generator. It achieves zero static error control and noise adaptive stabilization of the AC link in a multiple-input multiple-output system. Compared with the simulation results of the grid-connected inverter voltage and current double closed-loop (VACDCL) strategy, the nonlinear adaptive disturbance rejection control effectively mitigates the fluctuations in load current caused by the photovoltaic energy storage module. It ensures power tracking under variable power conditions and outperforms traditional PI dual-loop control in terms of dynamic and static regulation performance as well as grid-connected current quality. Furthermore, this strategy's anti-disturbance adaptive link can quickly respond to system disturbances like frequency drift, voltage oscillations, and load current variations, thereby improving system performance.

show abstract

Section: Analysis Of Vsg Nadrc Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

Kong,

Zhang,

Zhuolin

et al. 2023

IEEE Access

View full text Add to dashboard Cite

show abstract

“…In order to avoid system damage due to excessive power impact of VSG at the moment of grid connection, it is necessary to realize the output voltage of VSG with the same voltage amplitude and phase as the grid during grid connection switching. This process is called "pre-synchronization control of VSG" [8], [9]. For the VSG grid connection switching control or the pre-synchronization control, in [10], an integral element is added in the active and reactive power droop control to realize the VSG to track the grid frequency and voltage with zero static error firstly.…”

Section: Introductionmentioning

confidence: 99%

A Novel Pre-Synchronization Control for Grid Connection of Virtual Synchronous Generator

Chen

Zhang

Dong

et al. 2020

ELEKTRON ELEKTROTECH

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The virtual synchronous generator (VSG) introduces rotational inertia and damping through the droop control to take part in frequency regulation of the grid. By building the VSG model, the VSG controller, including both the frequency controller and the excitation controller, are analysed and designed. The analysis shows that the large phase difference Δθ between the VSG voltage and the grid voltage at the grid-tied moment may produce large power and damage the VSG. The proposed pre-synchronization control minimizes the phase difference, which is implemented by replacing Δθ with sinΔθ to avoid any step change from Δθ. The proposed method is able to simplify control, shorten pre-synchronization tracking time, and achieve high accuracy without a phase-lock loop. The built 12 kW VSG simulation and prototype verify the theoretical analysis, the proposed control and its associated design.

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Research on multi-VSG fast pre-synchronization grid connection with dual power loop

et al. 2020

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Research on Pre-Synchronization Control Strategy for Microgrid VSG Inverter

Cited by 6 publications

References 6 publications

Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

Nonlinear Adaptive Disturbance Rejection Control Strategy Based on VSG for Photovoltaic-Storage Grid-Connected Inverter

A Novel Pre-Synchronization Control for Grid Connection of Virtual Synchronous Generator

Research on multi-VSG fast pre-synchronization grid connection with dual power loop

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