A New Control Strategy Based on PLL to Enhance System Stability under Varying Output Power in Weak Grids

Liu, Junliang; Du, Xiong; Liu, Yuming; Li, Dengfeng; Zhang, Bo; Tong, Chenghui

doi:10.1109/ecce47101.2021.9595914

Cited by 4 publications

(2 citation statements)

References 10 publications

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“…Evidently, the findings herein confirm the relevant conclusions by prior studies (Huang et al, 2015;Xia et al, 2018;Malik et al, 2019). It has been proposed that increased PLL bandwidth would decrease stability (Céspedes and Sun, 2011;Liu et al, 2021). In this study, PLL parameters were re-tuned to reduce PLL bandwidth and improve system stability.…”

Section: Discussionsupporting

confidence: 88%

Impact of Electrical Connection Distance on the Open Loop Modal Resonance of Grid Connected Photovoltaic Farms

Zhang¹,

Shi²,

Xu³

et al. 2022

Front. Energy Res.

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The grid connection of photovoltaic (PV) farms may cause power system oscillations under the condition of open-loop modal resonance (OLMR). This study elucidated the origin of the induced low-frequency oscillations and examined the impact of the electrical distance between grid-connected PV farms on OLMR intensity by using a simplified real power network. A linearized state-space model of the real power system comprising grid-connected PV farms was derived. Based on this, an OLMR analysis was performed to examine the impact of the electrical distance between the grid-connected PV farms as well as between each grid-connected PV farm and the main grid. The OLMR analysis results indicate that the strength of the OLMR increases with the electrical distance between the PV farms, thereby leading to growing power oscillations. Moreover, the increase of electrical distance between each of the grid-connected PV farms and the main grid has a greater effect on OLMR intensity. Additionally, the non-linear simulations were performed to confirm the correctness of the OLMR analysis. Finally, by re-tuning the parameters of the control system of the grid-connected PV farms to reduce the phase-locked loop bandwidth, the OLMR can be effectively eliminated to avoid power oscillations.

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Section: Discussionsupporting

confidence: 88%

Impact of Electrical Connection Distance on the Open Loop Modal Resonance of Grid Connected Photovoltaic Farms

Zhang¹,

Shi²,

Xu³

et al. 2022

Front. Energy Res.

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“…An efficient grid control method is necessary to inject this extracted power into the grid. Phase Locked Loops (PLL) are used to identify the exact phase of the grid voltage [15][16][17]. Many control methods employ PI, PR, SMC etc for the grid-side control of the inverter [18][19][20].…”

Section: Grid Control Of Proposed Gtelimentioning

confidence: 99%

A single-phase grid-tied extendable-level inverter for renewable energy applications

Aishwarya

2024

Eng. Res. Express

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The extraction of power from green energy sources (GES) has rapidly popularized owing to increasing energy demands, depletion of fossil fuels and growing concerns about climatic changes. Grid-tied multilevel inverters are critical components in the integration of green energy sources into the power grid and offer numerous benefits over standard two-level inverters. These benefits include superior power quality, diminished harmonic distortion, and the potential to utilize high power levels efficiently. A single-phase Grid-Tied Extendable-Level Inverter (GTELI) for green energy applications is demonstrated in this paper. The GTELI offers superior power quality and distortion-free output relative to existing grid-tied multilevel inverters and hence is an excellent choice for extracting power from sustainable energy sources. To ensure efficient utilization, the extracted power from GTELI is to be integrated into the supply grid. A new current control algorithm for the GTELI is also proposed in this paper. Using this current control technique a grid control technique is established to modulate the power flow to the grid. The proposed GTELI achieved sinusoidal grid voltage and injected current with minimised harmonic distortions of 1.6% and 2.7% respectively, which comply well with the tolerable range of the IEEE 519 standard.

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Phase-Locked Loop Enabled Grid Support Strategy Based on Power Conversion System of Energy Storage

Wen,

Hou,

Liu

et al. 2024

2024 IEEE 10th International Power Electronics and Motion Control Conference (IPEMC2024-ECCE Asia)

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A New Control Strategy Based on PLL to Enhance System Stability under Varying Output Power in Weak Grids

Cited by 4 publications

References 10 publications

Impact of Electrical Connection Distance on the Open Loop Modal Resonance of Grid Connected Photovoltaic Farms

Impact of Electrical Connection Distance on the Open Loop Modal Resonance of Grid Connected Photovoltaic Farms

A single-phase grid-tied extendable-level inverter for renewable energy applications

Phase-Locked Loop Enabled Grid Support Strategy Based on Power Conversion System of Energy Storage

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