Analysis of Modal Resonance Between PLL and DC-Link Voltage Control in Weak-Grid Tied VSCs

Wang, Dong; Liang, Liang; Shi, Lei; Hu, Jiabing; Hou, Yunhe

doi:10.1109/tpwrs.2018.2871616

Cited by 78 publications

(27 citation statements)

References 26 publications

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“…This is contrary to the benefits of the reduction of the bandwidth for the DVC from the case of the Y dd . This is the result of a resonance between the DVC and the PLL as acknowledged in [38]. As such, a change in closed-loop bandwidth of the DVC moves the resonance; whereas a change in closed-loop bandwidth of the PLL increases or decreases the severity of the resonance.…”

Section: B Decomposition Of Y(s)mentioning

confidence: 99%

Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid

Agbemuko

Domínguez‐García

Gomis‐Bellmunt

et al. 2021

IEEE Trans. Power Delivery

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Despite attempts to increase the active power capability of vector-controlled voltage source converters (VSCs) connected to very weak grids, the interaction between the control dynamics and physical system is not completely understood. The result is often complex strategies that are difficult to implement. This paper proposes an intuitive modification of the VSC control based on physical considerations and dynamics of existing control. Several physical variables as seen from the point of common coupling (PCC) are found to contribute to the detrimental behavior of the VSC under weak connections. Hence, eliminating the impacts of these variables through feedforward eliminates their influence and significantly improves the active power capability. Notably, the basic structure of the vector controlled VSC is kept and its output-impedance is effectively reshaped. The proposed modification is validated through nonlinear time-domain simulations in MATLAB/Simulink Simscape Power System and results demonstrate the simplicity and intuitiveness of the modified structure.

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Section: B Decomposition Of Y(s)mentioning

confidence: 99%

Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid

Agbemuko

Domínguez‐García

Gomis‐Bellmunt

et al. 2021

IEEE Trans. Power Delivery

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“…The drawbacks of the PLL are its slow dynamic response [16] and complexity. FLL has faster dynamic responses [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Power quality improvement of single phase weak grid interfaced hybrid solar PV and wind system using double fundamental signal extracter‐based control

Gupta

Murshid

Singh

2019

IET Generation, Transmission & Distribution

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“…For this control strategy, a phase-locked loop (PLL) is commonly adopted, which functions to synchronize the wind control system with a power grid by tracking the phase angle of converter terminal bus voltage. However, several literatures have demonstrated that the dynamics of PLL may exhibit an adverse effect on the stability of VSCs that are connected to weak AC grids [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…This effect is also certified in [6] for a photovoltaic inverter. Literature [7], from the perspective of modal resonance, illustrates that the interactions between PLL and DC-link voltage control can lead to damping degradation of the closed-loop system, and weak grid integration will aggravate this side effect. The partial-VSC interfaced doubly-fed induction generator (DFIG) is also found to suffer similar instabilities due to PLL, except for the full-VSC based permanent magnetic synchronous generator (PMSG) [8].…”

Section: Introductionmentioning

confidence: 99%

Grid-Synchronization Stability Analysis for Multi DFIGs Connected in Parallel to Weak AC Grids

et al. 2019

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Recent works have shown that phase-locked loop (PLL) synchronized wind turbines (WTs) suffer stability issues when integrated into weak grids. However, most of the current studies are limited to a single machine case, the interactions among the WTs are usually overlooked. This paper studies the stability of multiple doubly-fed induction generators (DFIGs) that are connected in parallel to a weak AC grid. A state space model of a two-DFIG system is firstly presented. Subsequently, eigenvalue sensitivity analysis shows that instability can occur at low short-circuit ratio (SCR) or heavy loading conditions. Meanwhile, participation factor analysis implies that the unstable mode is primarily induced by the interactions between the PLLs of the two WTs. Further, to make out how the PLLs interact to cause instability, a reduced-order model is proposed for analysis simplicity, and an explanation in terms of transfer function residue is given for illustration. Detailed model-based time domain simulations are conducted to validate the analyses’ results.

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Analysis of Modal Resonance Between PLL and DC-Link Voltage Control in Weak-Grid Tied VSCs

Cited by 78 publications

References 26 publications

Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid

Passivity-Based Analysis and Performance Enhancement of a Vector Controlled VSC Connected to a Weak AC Grid

Power quality improvement of single phase weak grid interfaced hybrid solar PV and wind system using double fundamental signal extracter‐based control

Grid-Synchronization Stability Analysis for Multi DFIGs Connected in Parallel to Weak AC Grids

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