Analysis of solar inverter THD according to PWM's carrier frequency

Adak, Süleyman

doi:10.1109/icrera.2015.7418694

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Deteriorated waves are called as non-sinusoidal waves. Voltage and current waveform distortion due to harmonics can lead to the high-voltage installations and HST either damaged or blockaded [62][63][64][65].…”

Section: Plos Onementioning

confidence: 99%

High-frequency harmonics suppression in high-speed railway through magnetic integrated LLCL filter

Al-Barashi,

Wang,

Bhutta

2024

PLoS ONE

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The traction converter modulation generates switching-frequencies current harmonics. The trapped filters can eliminate these switching harmonics, reducing total inductance and filter size. Nonetheless, in comparison with the typical inductor-capacitor-inductor (LCL) filter, the trap inductor needs a larger magnetic core. Moreover, the trapped filter has not been analyzed in the traction systems. This paper proposes a magnetic integrated inductor-trap-inductor (LLCL) filter to decrease the filter’s size and investigate its application in traction converters. In fact, the application range of this filter is quite broad, and it can be used in various electrical power systems, including industrial power systems, renewable energy systems, transportation systems, and building power systems. The LC-trap may be formed by connecting the equivalent trap inductor, introduced through the magnetic coupling between inverter-side and grid-side inductors, in series with the filter capacitor. Furthermore, for H-bridge unipolar pulse width modulation (PWM) traction converters, the prominent switching harmonics are concentrated at the double switching frequencies. Therefore, the stability zone is expanded by moving the resonance above the Nyquist frequency. The presented filter’s features and design are thoroughly analyzed. The proposed method is finally validated by the MATLAB/Simulink simulation and hardware-in-the-loop (HIL) experimental results. Compared to the discrete windings, the integrated ones can save two magnetic cores. Furthermore, the proposed filter can meet IEEE criteria with 0.3% for all the harmonics and total harmonic distortion (THD) of 2.15% of the grid‐side current.

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Section: Plos Onementioning

confidence: 99%

High-frequency harmonics suppression in high-speed railway through magnetic integrated LLCL filter

Al-Barashi,

Wang,

Bhutta

2024

PLoS ONE

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“…The size of the PV array should be selected by some parameters such as seasonal variation of solar irradiation, cell temperature, the daily energy usage, battery efficiency, etc. [10,11]. The two main basic variables that can be set to the input of PV simulation system.…”

Section: Figure 2 Principle Scheme Of Stand-alone Pv System (Filtered)mentioning

confidence: 99%

Design of an LLCL type filter for stand-alone PV systems’ harmonics

Adak¹,

Yılmaz²

2019

Journal of Energy Systems

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This paper is regarding the design, modeling and simulation for reducing harmonics with passive LLCL filter in off-grid solar system. It is desired that current and voltage waveforms are to be in the sinusoidal form during energy generation from stand-alone solar systems. This condition can be provided by the most important one of the main factors which to determine the quality of electrical energy. Due to the harmonics produced by the non-linear loads, the waveform of the current and voltage is distorted from the sinusoidal form. The passive LLCL filter is designed and analyzed for mitigation of the total harmonic distortion for current (THD I) in the proposed offgrid PV system. The passive LLCL filter is practically installed between solar inverter and nonlinear load. Simulation results are in a good compliance with the theoretical analysis. This study describes a design methodology of a LLCL filter for off-grid power system with a comprehensive study of how to mitigate the harmonics in off-grid solar system. The using of a LLCL filter mitigates the THD I that injected by a six pulse rectifier which is used as a non-linear load. The simulation result shows that the reduction of THD I from 89.89% to 3.257%. This paper attempts to show that the using of LLCL filter with a stand-alone solar system can highly improve the power quality of the system.

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“…However, none of the previous works discussed the relation between THD I and the irradiance and temperature and developed a mathematical expression to understand the relation. In [13], a unique modeling of harmonics in PV systems has been developed.…”

Section: Introductionmentioning

confidence: 99%

Developed analytical expression for current harmonic distortion of the PV system’s inverter in relation to the solar irradiance and temperature

2020

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This paper deals with modeling and simulation of the total harmonic distortion of the current (THD I ) dispatched from the inverter and connected to nonlinear load. The change of THD I was examined in relation to the ambient temperature (T ) and solar irradiance (G). The developed model is being used to extract parameters for a given THD I as a function of temperature and solar radiation. This study outlines the working principle of photovoltaic (PV) panel as well as PV array. Off-grid PV system is modeled by using Matlab/Simulink program, and detailed analytical study has been carried out in this work. The design, modeling and simulation of this study are performed from 50 up to 988 W/m 2 for solar irradiance. Harmonic components have negative effects on the steady-voltage stability of the PV system. Therefore, analytical expression is needed for steady-state stability analysis in order to reduce negative effects. Hence, two analytical expressions of THD I were obtained by two new different methods which are statistical package for the social sciences program and genetic expression programming. Eventually, two different methods have been verified by the Matlab/Simulink program in order to find out THD I and demonstrated the effectiveness of the proposed strategy. As a result of this study, it is observed that input current THDI of nonlinear load is too high at low irradiance. It is suggested that active harmonic filters should be used at low irradiance in order to produce better quality energy and avoid damages in the PV system.

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Analysis of solar inverter THD according to PWM's carrier frequency

Cited by 4 publications

References 9 publications

High-frequency harmonics suppression in high-speed railway through magnetic integrated LLCL filter

High-frequency harmonics suppression in high-speed railway through magnetic integrated LLCL filter

Design of an LLCL type filter for stand-alone PV systems’ harmonics

Developed analytical expression for current harmonic distortion of the PV system’s inverter in relation to the solar irradiance and temperature

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