A New Two-Phase Stationary-Frame-Based Enhanced PLL for Three-Phase Grid Synchronization

Wu, Fengjiang; Zhang, Lujie; Duan, Jiandong

doi:10.1109/tcsii.2014.2368257

Cited by 57 publications

(18 citation statements)

References 12 publications

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“…Increasing PLL bandwidth is helpful for the fast and accurate grid synchronization. The PLL bandwidth should be large enough for the fast grid synchronization, and this is why diverse PLL designs have been proposed, as shown in [22][23][24][25][26][27][28]. However, when the PLL bandwidth is increased beyond a certain limit, the system may become unstable due to resonance between the inverter and the weak grid.…”

Section: Introductionmentioning

confidence: 99%

Impact of phase-locked loop on stability of active damped LCL-filter-based grid-connected inverters with capacitor voltage feedback

Guo

Liu

Wang

2017

J. Mod. Power Syst. Clean Energy

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Active damped LCL-filter-based inverters have been widely used for grid-connected distributed generation (DG) systems. In weak grids, however, the phase-locked loop (PLL) dynamics may detrimentally affect the stability of grid-connected inverters due to interaction between the PLL and the controller. In order to solve the problem, the impact of PLL dynamics on small-signal stability is investigated for the active damped LCL-filtered grid-connected inverters with capacitor voltage feedback. The system closed-loop transfer function is established based on the Norton equivalent model by taking the PLL dynamics into account. Using an established model, the system stability boundary is identified from the viewpoint of PLL bandwidth and current regulator gain. The accuracy of the ranges of stability for the PLL bandwidth and current regulator gain is verified by both simulation and experimental results.

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Section: Introductionmentioning

confidence: 99%

Impact of phase-locked loop on stability of active damped LCL-filter-based grid-connected inverters with capacitor voltage feedback

Guo

Liu

Wang

2017

J. Mod. Power Syst. Clean Energy

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“…Proposed virtual QC-EPLL: in [7], a QC-EPLL is proposed to realise the synchronisation information estimation of the three-phase power grid with reduced calculation burden compared with the SRF-PLL algorithm. In this Letter, the QC-EPLL is used in the single-phase system.…”

Section: Fig 1 Configuration Of Standard Single-phase Epllmentioning

confidence: 99%

Virtual quadrature‐coordinate EPLL for single‐phase grid information synchronisation

Wang

2019

Electron. lett.

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The transient response of the single-phase enhanced PLL (EPLL) under the step change of amplitude, phase angle, and frequency is derived. It is revealed that there are transient periodic ripples in the estimation results of the standard EPLL. Furthermore, a virtual quadraturecoordinate EPLL combining a second-order generalised integrator with a quadrature-coordinate EPLL is proposed and the transient response is derived. The proposed EPLL possesses a better dynamic performance than the standard EPLL. The detailed experimental results are shown and compared with each other to validate the theoretical analysis and the advantages of the proposed EPLL.

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“…I bs′ = ω o1 + ω bs μ bs + ω cs μ cs + ω as μ as (11) I cs′ = ω o1 + ω cs μ cs + ω as μ as + ω bs μ bs (12) Here, ω as , ω bs , ω cs , ω o1 are the updated weights and bias weights of the hidden layer of three phases, respectively. Therefore, by utilising the average weighted value (ω Lsa ), the active power load current component, ω as , ω bs , ω cs are obtained.…”

Section: Calculation Of Component Of Average Load Current Active Powermentioning

confidence: 99%

Neural network‐based quickprop control algorithm for grid connected solar PV‐DSTATCOM system

Shukl

Singh

2019

IET Renewable Power Generation

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For the optimal operation of grid interfaced solar photovoltaic (PV) system, a neural network-based Quickprop control algorithm is presented in this study. The solar PV array supplies maximum power by utilising an incremental conductance-based maximum power point tracking technique to the grid and the load. When the solar power is not present, during cloudy days or at night, the distribution static compensator (DSTATCOM) operation is performed by harmonics mitigation and reactive power compensation of the loads connected at the point of intersection. The proposed system improves power quality when solar PV power is present, along with active power transfer from solar PV array to grid/load. Thus, a smooth transition is provided between these modes with neural network-based Quickprop control algorithm. Moreover, the neural network-based control technique offers enhanced accuracy due to the combinational neural structure in the estimation process. A laboratory prototype is developed for validation and experimental results corroborate reliable operation for modes of operation as DSTATCOM and grid interfaced PV system at varying load and solar insolation condition.

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A New Two-Phase Stationary-Frame-Based Enhanced PLL for Three-Phase Grid Synchronization

Cited by 57 publications

References 12 publications

Impact of phase-locked loop on stability of active damped LCL-filter-based grid-connected inverters with capacitor voltage feedback

Impact of phase-locked loop on stability of active damped LCL-filter-based grid-connected inverters with capacitor voltage feedback

Virtual quadrature‐coordinate EPLL for single‐phase grid information synchronisation

Neural network‐based quickprop control algorithm for grid connected solar PV‐DSTATCOM system

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