Analysis of Synchronous Frequency Resonance in VSG Based on the Sequence Impedance Models

Yu, Yanxue; Zhang, Mengxiang; Antoine, Musengimana; Li, Haoyu

doi:10.1109/icems.2019.8922440

Cited by 11 publications

(14 citation statements)

References 11 publications

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“…In [9,10], small-signal state-space models are developed for VSG controlled converters with the connected grid, and critical parameters for system stability are identified with the eigenvalue analysis and the parameter sensitivity analysis. It is also found in [11][12][13][14] that the impedance characteristics of grid-connected converters under this typical VSG control strategy is generally inductive with relatively low magnitude, which is more compatible with the inductive weak grid than the traditional grid-following converter with a phase-locked loop (PLL), but grid-connected converters under this typical VSG control strategy also have the low-frequency oscillation risk with the series-compensated network similar as traditional SGs.…”

Section: Introductionmentioning

confidence: 94%

“…Then, by substituting ( 14)-( 19) into (12), the perturbed dq-axis output voltage references of the cascaded control loop satisfy: (20) where detailed expressions of G ψ2E , G v2E , G i2E , and G θ2E are as:…”

Section: Modeling Of Cascaded Inner Control Loop With Virtual Impedancementioning

confidence: 99%

“…The small-signal modeling and the impedance modeling of grid-connected converters under a typical VSG control strategy is analyzed in [8][9][10][11][12][13][14], where the output voltage reference from SG models is directly used to generate the PWM signals for converters as proposed in [15]. In [8], a line-frequency-averaged small-signal model is developed to design the power loop of the typical VSG strategy.…”

Section: Introductionmentioning

confidence: 99%

“…Virtual impedance control is also applied to emulate the quasi-stationary characteristics of the synchronous impedance in a traditional SG. Compared with above-mentioned typical VSG control strategy with direct open loop PWM control in [8][9][10][11][12][13][14][15], the cascaded inner control loop in the VSG strategy in [18][19][20] can conveniently implement the limitations and saturations of voltage and current outputs, which is a significant requirement to improve the current control capability and guarantee the safe operation of converters.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impedance Modeling and Stability Analysis of VSG Controlled Grid-Connected Converters with Cascaded Inner Control Loop

Nian

Wang

et al. 2020

Energies

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This paper develops the impedance models of grid-connected converters under the virtual synchronous generator (VSG) strategy with a cascaded inner control loop and analyzes the system stability of VSG controlled converters with different kinds of weak grid. Different from existing small-signal models with high dimensions, a single-in-single-out (SISO) impedance model with simple mathematical expression is obtained in this paper, which is applied to identify the influence of the cascaded control loop on impedance characteristics and system stability. It is found that the impedance characteristics of VSG controlled converters can become capacitive below the fundamental frequency, and it is mainly caused by the voltage controller in the cascaded control loop of the VSG strategy. Impedance-based stability analysis shows that the capacitive impedance characteristics can benefit the compatibility of converters operated with the series-compensated weak grid, but may deteriorate the system stability with the inductive weak grid, which can be avoided by increasing the proportional coefficients of the cascaded voltage and current controllers or applying a larger virtual resistor to reduce the negative resistance in the capacitive frequency range. Experiments based on the control-hardware-in-loop (CHIL) platform were carried out to verify the developed analytical models and possible system instable cases.

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Section: Introductionmentioning

confidence: 94%

Section: Modeling Of Cascaded Inner Control Loop With Virtual Impedancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impedance Modeling and Stability Analysis of VSG Controlled Grid-Connected Converters with Cascaded Inner Control Loop

Nian

Wang

et al. 2020

Energies

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show abstract

“…Because it treats the subsystem as a black‐box, no more detailed information about interconnected subsystem is required as long as measurements can be obtained at its own terminal. Moreover, the impedance model can also be utilized to study the SFR problem, since the admittance can reflect the closed‐loop characteristics of whole system [15].…”

Section: Introductionmentioning

confidence: 99%

Impedance modelling and grid integration stability evaluation of three‐phase virtual synchronous generator

Chen

Zhang

Yang

et al. 2021

IET Power Electronics

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Virtual synchronous generator (VSG), which can behave with analogous characteristics as the conventional synchronous generator (SG) and provide voltage and inertia/damping support, is universally regarded as a grid‐friendly interface. Here, the comprehensive sequence‐impedance model of the VSG is developed by using the harmonic linearization method. To improve the accuracy of impedance model, the influences of the reactive power loop (RPL) and mirror frequency effect (MFE) are discussed and evaluated for the first time. Three different impedance models of the VSG (conventional, considering RPL, and considering both MFE and RPL) are derived and compared in detail. Besides, the synchronous frequency resonance (SFR) issue and grid‐interactive oscillation risk of the VSG are also investigated. The results indicate that the VSG may suffer from power oscillation when the integral coefficient of RPL is too large, but has excellent robustness and stability when connected to weak grid. This feature makes it more appealing in weak grid integration. Finally, the validity of the theoretical analysis is verified by simulations and experiments.

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Analysis and suppression method of synchronous frequency resonance for self-synchronizing voltage source inverter

Fu,

Chen,

Xie

et al. 2024

International Journal of Electrical Power & Energy Systems

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Analysis of Synchronous Frequency Resonance in VSG Based on the Sequence Impedance Models

Cited by 11 publications

References 11 publications

Impedance Modeling and Stability Analysis of VSG Controlled Grid-Connected Converters with Cascaded Inner Control Loop

Impedance Modeling and Stability Analysis of VSG Controlled Grid-Connected Converters with Cascaded Inner Control Loop

Impedance modelling and grid integration stability evaluation of three‐phase virtual synchronous generator

Analysis and suppression method of synchronous frequency resonance for self-synchronizing voltage source inverter

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