Using asymmetric current controller to improve the stability of grid-inverter system due to PLL effect

Du, Xiong; Wang, Guoning; Song, Ying; Yang, Yongheng; Zou, Xiaoming; Tai, Heng–Ming; Ji, Yongliang

doi:10.1109/compel.2017.8013317

Cited by 16 publications

(15 citation statements)

References 16 publications

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“…The modelling is achieved by injecting a small signal symmetrical perturbation voltage V p, ω p at frequency ω p into the AC side of inverter. First, referring to [21], the small signal model of Park transformation can be expressed as…”

Section: Modelling Of Single Equivalent Inverter Admittancementioning

confidence: 99%

Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Zou

Wang

et al. 2019

IET Power Electronics

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Admittance matrix has been used to represent the characteristics of three-phase inverter for grid-inverter system stability evaluation in both stationary, sequence, and dq domain. For the dq domain admittance matrix, the PLL and Park transformation introduce additional dynamics during the admittance measurement that may influence the application of dq model. For the stationary and sequence domain admittance matrix, the model measurement is not affected by the above additional parts but may also encounter other difficulties in actual measurement. First, current frequency response analyser (FRA) is not able to perform two-frequency measurement required by the admittance matrix. Second, practical limitations exist in the course of solving complex-valued admittance matrix equations. Here, a single stationary domain equivalent admittance of three-phase inverter for grid-inverter system with considering the interaction between grid and inverter is defined so that the above two difficulties can be avoided. Then, an equivalent admittance model of prototype inverter is constructed for stability analysis of the grid-inverter system using Nyquist stability criterion, instead of the generalised Nyquist criterion (GNC). The effectiveness of the proposed equivalent inverter admittance model is validated through simulation and experiment verification.

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Section: Modelling Of Single Equivalent Inverter Admittancementioning

confidence: 99%

Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Zou

Wang

et al. 2019

IET Power Electronics

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“…where D pdq, ω p − ω 0 and I pdq, ω p − ω 0 are phasors of the perturbed duty cycle and grid current in dq frame. According to [29], after dq transformation, we have…”

Section: Equivalent Converter Impedance Model Considering Pll and Frementioning

confidence: 99%

Effects on oscillation mechanism and design of grid‐voltage feedforward in grid‐tied converter under weak grid

Wang

Song

et al. 2019

IET Power Electronics

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Grid-voltage feedforward control is widely used in grid-tied converters. The reported studies show that the gridvoltage feedforward may reduce the system stability margin, and may lead to oscillation problem in renewable power generation system. This study revisits the effect of voltage feedforward control on system stability and especially focuses on low frequency oscillation with impedance-based method. The low frequency oscillation usually happens in industry around 100 Hz and shows frequency coupling characteristics. A converter equivalent impedance which includes the effects of voltage feedforward and also covers the frequency coupling introduced by phase locked loop (PLL) is established. Based on the built impedance, the effect on oscillation mechanism with voltage feedforward and PLL is revealed. The results show that the voltage feedforward could increase the system stability margin and may be employed to improve the system stability. Then how to design an optimal proportional voltage feedforward control is demonstrated. Experimental results verify the theoretical analysis and the design of the proportional grid-voltage feedforward control.

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“…Wind and solar energy conversion systems, as well as new energy storage systems, are usually connected to the grid via voltage‐source current‐controlled converters [1, 2]. Due to the exponentially increase in the use of these energy resources, the interest on the iteration of their converters with the electric grid has been boosted in the literature [3–40]. It has been shown that, for electric grids with low short circuit ratio (SCR), the synchronism algorithm may have a negative impact on the stability of the grid‐tied converters [3–6].…”

Section: Introductionmentioning

confidence: 99%

PLL parameters tuning guidelines to increase stability margins in multiple three‐phase converters connected to weak grids

Nicolini

Pinheiro

Carnielutti

et al. 2020

IET Renewable Power Generation

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Using asymmetric current controller to improve the stability of grid-inverter system due to PLL effect

Cited by 16 publications

References 16 publications

Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Single stationary domain equivalent inverter admittance for three‐phase grid‐inverter system considering the interaction between grid and inverter

Effects on oscillation mechanism and design of grid‐voltage feedforward in grid‐tied converter under weak grid

PLL parameters tuning guidelines to increase stability margins in multiple three‐phase converters connected to weak grids

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