Control and Design of Seven-Level Cascaded Multilevel Converter for Transformerless Large-Scale Photovoltaic Integration

Kulkarni, Jyoti; Kumar, Narendra; Singh, Bhim

doi:10.1007/s40031-020-00472-7

Cited by 4 publications

(5 citation statements)

References 25 publications

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“…A three-phase, 3.3 kV, 1.48 MW, and 50 Hz power frequency grid-connected solar PV system is prominently investigated in this work, as given in [37]. The main block diagram of the CHB configuration of the grid-connected PV system is shown in Figure 1a.…”

Section: System Descriptionmentioning

confidence: 99%

“…The main task is to simulate the performance of this 1.48 MW three-phase PV-fed power grid using Nlevel H-bridge inverters. The total number of levels in the cascaded MLI has a value of (2 × number of H − bridge per phase + 1) [37]. For instance, a seven-level inverter con-tains nine H-bridges, so three H-bridges per phase, which are fed by the independent PV array.…”

Section: System Descriptionmentioning

confidence: 99%

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Design of Cascaded Multilevel Inverter and Enhanced MPPT Method for Large-Scale Photovoltaic System Integration

et al. 2023

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The key goal of this effort is to develop an efficient control system for a three-phase cascaded H-bridge multilevel inverter powered by the photovoltaic (PV) system. The power for the system is generated through the use of PV modules, which serve as DC inputs for the cascaded H-bridge multilevel inverter. The authors aim to achieve a nearly sinusoidal signal at the voltage level and are specifically focused on minimizing the total harmonic distortion (THD) to the smallest possible value. Hence, an advanced N-level space vector modulation (SVM) is developed to ensure an appropriate control for the cascaded inverter. The aim is to design an effective control strategy to increase inverter efficacy and, thus, supply the best output quality. In addition, a robust approach to the maximum power point (MPP) tracking (MPPT) technique is developed based on an adaptive perturb and observe (P&O) algorithm to ensure superior tracking of the MPP. The developed algorithm eliminates 90% of the power curve area in the search space process and only maintains 10% of the area that includes the MPP. Each PV system employs its own improved MPPT control. The numerical results confirm that the enhanced P&O algorithm attains a precise response with superior efficiency and a fast response under the fast alteration of environmental conditions. Hence, the energy loss is reduced. The simulation results validate the effectiveness of this study, highlighting the high efficiency of the control strategy and the enhanced performance of the proposed scheme with lesser THD values.

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Section: System Descriptionmentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Design of Cascaded Multilevel Inverter and Enhanced MPPT Method for Large-Scale Photovoltaic System Integration

et al. 2023

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“…The system is designed for 3.3 kV, 1.48 MW, and 50 Hz frequency grid. The designing of the parameter is done as given in [12] and Table 1 demonstrates the system specifications. The modulating technique is switches grid‐tied system in a single‐stage that is, without a boost converter.…”

Section: Configuration Of 9‐level Chb Convertermentioning

confidence: 99%

“…The modulating technique is switches grid‐tied system in a single‐stage that is, without a boost converter. The control scheme comprises of improved perturb and observation algorithm for maximum power extraction and decoupled current control with synchronous reference frame (SRF) based phase locked loop (PLL) for voltage source converter (VSC) control as given in [12]. The switching table for the converter is shown in Table 2.…”

Section: Configuration Of 9‐level Chb Convertermentioning

confidence: 99%

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Power quality investigation of CHB nine‐level converter based large‐scale solar PV system with different modulation schemes

Kulkarni

Yadav

Singh

et al. 2021

Energy Conversion and Econom

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Multilevel converters (MLCs) are extensively used in solar photovoltaic (SPV) applications owing to their advantages such as low total harmonic distortion (THD) in the converter voltage, reduction in device stress, and switching losses. A suitable modulation technique is important for the efficient closed‐loop control of megawatt (MW)‐scale solar photovoltaic plants. This work utilises different modulation techniques, such as phase‐shifted (PS) multicarrier pulse width modulation (PWM), selected harmonic elimination (SHE), and nearest level modulation (NLM), for switching of cascaded H‐bridge (CHB) converter‐based large‐scale SPV systems. The investigation on improving power quality is presented with a suitable fast Fourier transform (FFT) analysis and comparative graphs. The presented control and modulation enhance the power quality of the output current being fed to the grid in the dynamic solar profile. Moreover, the low switching frequency employed in this photovoltaic converter at a high power rating increases the system efficiency. Graphical illustrations of losses with fundamental and PWM switching were analysed for the MW‐rated system. The obtained results show that SHE‐PWM provides the best performance for large‐scale solar power plants. Furthermore, the IEEE‐519 standard was met for both grid voltages and currents. The system was modelled and simulated in MATLAB/Simulink and validated in a real‐time environment.

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Leakage current reduction in asymmetric transformerless cross-switched reverse connected voltage sources X10 multilevel inverter for photovoltaic application

Muraly,

Vimal Raj

2023

Electr Eng

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Control and Design of Seven-Level Cascaded Multilevel Converter for Transformerless Large-Scale Photovoltaic Integration

Cited by 4 publications

References 25 publications

Design of Cascaded Multilevel Inverter and Enhanced MPPT Method for Large-Scale Photovoltaic System Integration

Design of Cascaded Multilevel Inverter and Enhanced MPPT Method for Large-Scale Photovoltaic System Integration

Power quality investigation of CHB nine‐level converter based large‐scale solar PV system with different modulation schemes

Leakage current reduction in asymmetric transformerless cross-switched reverse connected voltage sources X10 multilevel inverter for photovoltaic application

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