Dynamic Frequency Performance Analysis and Improvement for Parallel VSG Systems Considering Virtual Inertia and Damping Coefficient

Chen, Shimiao; Sun, Yang; Han, Hua; Shi, Guangze; Guan, Yajuan; Guerrero, Josep M.

doi:10.1109/jestpe.2022.3208249

Cited by 27 publications

(7 citation statements)

References 28 publications

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“…Among them, the control parameters of VSG can only be selected within a certain range due to its own operating characteristics. 30,31 When the VSG-SVG parallel system is subject to large disturbances, it is difficult to maintain the stability of its transient power angle by optimizing the control parameters.…”

Section: Improvement Strategy For Transient Power Angle Stability Of ...mentioning

confidence: 99%

“…The methods to improve the transient power angle stability of the VSG–SVG parallel system mainly include optimizing the VSG control parameters, increasing the SVG compensation capacity, optimizing the virtual impedance design, and adjusting the transient power command. Among them, the control parameters of VSG can only be selected within a certain range due to its own operating characteristics 30,31 . When the VSG–SVG parallel system is subject to large disturbances, it is difficult to maintain the stability of its transient power angle by optimizing the control parameters.…”

Section: Improvement Strategy For Transient Power Angle Stability Of ...mentioning

confidence: 99%

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Transient power angle stability analysis and improvement strategy for parallel system of virtual synchronous generator and static var generator

Xiao,

Jiang,

et al. 2023

Circuit Theory & Apps

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SummaryVirtual synchronous generators (VSGs) can actively support the frequency and voltage of the grid and are widely used in new energy power plants. Static var generators (SVGs) can improve the reactive power–voltage drop characteristics of the VSG and increase its ability to cope with complex operating conditions. However, the interaction between the VSG and the SVG can affect the output characteristics of the VSG and thus its transient power angle stability. Therefore, this paper proposes a method for analyzing the transient power angle stability of a VSG–SVG parallel system and its improvement strategy. Firstly, based on the equivalent circuit of the parallel system, the interaction‐coupled power model and the transient power angle characteristic model are derived. On this basis, the influence law of various parameters on the transient stability of VSG is analyzed based on the phase plane method. Secondly, a strategy is proposed to improve the transient power angle stability of the VSG–SVG parallel system based on the adaptive regulation of active power, and the feasibility of the strategy is verified by comparing the phase plane diagrams before and after the improved control. Finally, the effectiveness of the proposed model and strategy is verified by Matlab/Simulink simulation.

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Section: Improvement Strategy For Transient Power Angle Stability Of ...mentioning

confidence: 99%

Section: Improvement Strategy For Transient Power Angle Stability Of ...mentioning

confidence: 99%

Transient power angle stability analysis and improvement strategy for parallel system of virtual synchronous generator and static var generator

Xiao,

Jiang,

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…To address this challenge, scholars worldwide have proposed employing a VSG approach. This method involves simulating the rotor characteristics of a synchronous generator to enhance the inverter's ability to mitigate frequency and power fluctuations, thereby improving overall system stability [6,7,8]. Reference [9] proposes a rotational inertia frequency control strategy for distributed power sources equipped with energy storage.…”

Section: Introductionmentioning

confidence: 99%

Parametric adaptive inverter VSG control strategy with transient damping characteristics

Chen,

Wang,

Wang

2024

IEICE Electron. Express

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With the continuous development of new energy generation and power electronics technology, Virtual Synchronous Generator (VSG) technology has been widely applied. VSG technology achieves power exchange between the DC side and the system by controlling the inverter. Traditional VSG control strategies suffer from issues such as long transient adjustment times, poor stability, and steady-state deviations. To address these challenges, this paper proposes an adaptive parameter control strategy for a virtual synchronous generator with transient damping characteristics. Initially, transient damping is introduced on the basis of the traditional constant damping strategy to eliminate the steady-state error during the primary frequency control of the system under grid frequency fluctuations. Subsequently, an analysis is conducted on the dynamic behavior of the VSG by examining the trends in variations of its rotational inertia and damping coefficients under system oscillations, an inertia damping adaptive control strategy is proposed. Finally, a simulation model of the system is constructed using MATLAB/Simulink, and this control strategy is compared with existing strategies through simulation. The results demonstrate that this control strategy enhances the transient performance of the VSG system, improves system stability, and reduces steady-state errors.

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“…The studies above give insights into the stability of a single 2 converter system; however, if the converters are connected in parallel to increase the power rating, the control interactions must be addressed in a non-stiff grid [21]. The PLL interactions in a weak grid-tied parallel VSCs system increase, resulting in instability; however, reduced PLL bandwidth [22] and an improved notch filter ensure stability [23].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

Rahman,

Mohamed

2024

IEEE Open J. Power Electron.

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The parallel operation of power converters is essential to meet increased power demands. However, due to dynamic coupling, the instability in one converter can affect the stability of another. Therefore, this paper analyses the interaction and stability differences among the weak grid-tied photovoltaic (PV)-interfaced parallel voltage-and current-source converters (VSCs and CSCs) considering the PV generator (PVG) dynamics. Moreover, the impacts of the changing PVG operating points from the constant-voltage to a constant-current region (CVR to a CCR) and changing control parameters on converters' dynamic interaction are studied and compared in both cases. It is found that parallel VSCs dc-links suffer from low-frequency (<60 Hz) compared to high-frequency oscillations (>200 Hz) in parallel CSCs at the CCR with a short-circuit ratio (SCR) of 2.5. Moreover, the oscillation magnitude of injected power is higher in parallel VSCs compared to the parallel CSCs at SCR=1.2. Therefore, a stabilization method is proposed for both systems to ensure reduced interactions and stable operation in the CVR, CCR, and maximum power regions at weak and very weak grid conditions. Finally, the proposed compensators' efficacy is validated via detailed nonlinear time-domain and real-time simulation results.

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Dynamic Frequency Performance Analysis and Improvement for Parallel VSG Systems Considering Virtual Inertia and Damping Coefficient

Cited by 27 publications

References 28 publications

Transient power angle stability analysis and improvement strategy for parallel system of virtual synchronous generator and static var generator

Transient power angle stability analysis and improvement strategy for parallel system of virtual synchronous generator and static var generator

Parametric adaptive inverter VSG control strategy with transient damping characteristics

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

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