Single phase transformerless photovoltaic inverter with reactive power control

Brahmbhatt, Bhavik; Chandwani, Hina

doi:10.1109/icpeices.2016.7853435

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…On the other hand, 𝜔 𝑛1 =𝜔 𝑛2 =2*pi*50 rad/s (same as for tuning SOGI-FLL) is used to compute the gain k and k' respectively. The bode graphs in Figure 6 demonstrates the impact of both gain adjustments as well as performance assessment of SOGI-FLL and MSOGI-FLL using magnitude plots of transfer functions from equations [1-3] and [5][6][7]. Figures 6 (a is close to 0dB.…”

Section: Structure and Transfer Functions : Msogi-fllmentioning

confidence: 96%

“…Golestan et al [3,4] addressed the categorization of phase lock loop with varying phase detector. Under distorted grid signal circumstances, PD structures based on generalised integrators (GI) function better and are more reliable [4,5]. Thus, SOGI-PLL is better than other PLL designs [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Under distorted grid signal circumstances, PD structures based on generalised integrators (GI) function better and are more reliable [4,5]. Thus, SOGI-PLL is better than other PLL designs [3][4][5]. It works quickly and accurately in bad grid circumstances.…”

Section: Introductionmentioning

confidence: 99%

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Modified Second Order Generalized Integrator-frequency Locked Loop Grid Synchronization for Single Phase Grid tied System Tuning and Experimentation Assessment

Brahmbhatt¹,

Chandwani

2022

IJE

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T he phase-locked loop (PLL) is applied in grid-tied systems to synchronise converter operation with grid voltage, affecting converter stability and performance. Synchronous reference frame PLL (SRF-PLL) is a popular grid synchronisation method due to its simplicity and reliability. Normal SRF-PLL cannot suppress DC offset, causing basic frequency and phase oscillations.When a grid is irregular, its bandwidth should be reduced to ensure acceptable disturbance rejection without sacrificing detection speed. T o enhance the phase-angle estimation speed and accuracy, the researchers modified structure by adding the pre/in-loop filter in advanced PLLs.The capacity to deliver improved dynamic response and reduced settling time without compromising system stability or the ability to eliminate disturbances is a major issue for PLLs. Among different control methods, SOGI-FLL (second-order generalised integrator-based frequency locked loop) had the best performance. It tracks grid voltage frequency precisely even when there is harmonics,voltage variations, frequency fluctuations, etc. In the event of a dc offset, the calculated frequency incorporates low frequency oscillations. A modified second-order generalised integrator frequency-locked loop (MSOGI-FLL) is presented in this work to address grid voltage anomalies of all types, including dc offset. Using the Waijung Block-set of MAT LAB/Simulink, a Modified SOGI-FLL is realized and evaluated by applying abnormal grid voltage situations using a low-cost DSP-based ST M32F407VGT microcontroller. T he results demonstrate MSOGI-better FLL's performance in harsh circumstances.

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Section: Structure and Transfer Functions : Msogi-fllmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Modified Second Order Generalized Integrator-frequency Locked Loop Grid Synchronization for Single Phase Grid tied System Tuning and Experimentation Assessment

Brahmbhatt¹,

Chandwani

2022

IJE

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Tuning and experimental assessment of second-order generalized integrator –frequency locked loop grid synchronization for single-phase grid assisted system

Brahmbhatt¹,

Chandwani

2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The phase-locked loop (PLL) is an essential part of the grid-tied system to synchronize control of converter with grid voltage, particularly affects the converter stability as well as performance under weak grid conditions. During abnormality in a grid, its bandwidth ought to be a11dequately brought down to achieve appropriate disturbance rejection capability with a compromise to slower detection speed. The researchers have done intended work in advanced PLLs to improve phase-angle detection speed by modifying the pre/in-loop filtering stage. A most concerning challenge with the PLLs is the means by which to additionally provide superior dynamic performance and reduced settling time without bargaining stability of system along with the capability of disturbance elimination To overcome this challenge, this paper describes the second-order generalized integrator (SOGI-Frequency Look loop (FLL) which offers filtering capability like band-pass filter, low-pass filter, and notch filter for adaptive frequency tuning as well as an orthogonal signal generation for the grid-tied photovoltaic inverter. The impact of control parameters on their dynamic performance in SOGI-FLL is tabulated from a step response of frequency estimation by taking a frequncy shift. Furthermore, Low-cost DSP based STM32F407VGT the microcontroller is employed to implement a SOGI-FLL to test under adverse grid conditions using Waijung Block-set of SIMULINK/MATLAB. The experimental results of SOGI-FLL have proven superior dynamic performance over type-2 PLLs by choosing the appropriate value of the control parameter of SOGI-FLL.

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Reactive Power Management in Renewable Rich Power Grids: A Review of Grid-Codes, Renewable Generators, Support Devices, Control Strategies and Optimization Algorithms

2018

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Single phase transformerless photovoltaic inverter with reactive power control

Cited by 3 publications

References 5 publications

Modified Second Order Generalized Integrator-frequency Locked Loop Grid Synchronization for Single Phase Grid tied System Tuning and Experimentation Assessment

Modified Second Order Generalized Integrator-frequency Locked Loop Grid Synchronization for Single Phase Grid tied System Tuning and Experimentation Assessment

Tuning and experimental assessment of second-order generalized integrator –frequency locked loop grid synchronization for single-phase grid assisted system

Reactive Power Management in Renewable Rich Power Grids: A Review of Grid-Codes, Renewable Generators, Support Devices, Control Strategies and Optimization Algorithms

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