Design of SVPWM-Based Two-Leg VSI for Solar PV Grid-Connected Systems
01 Jan 2020-pp 879-892
TL;DR: In this article, a two-leg four-switch inverter (B-4 inverter) was used for low power solar PV grid-connected applications to optimize the cost and size of the PV system.
Abstract: In this work, a four-switch Voltage Source Inverter (VSI) is considered for highly efficient and low power solar PV grid-connected applications to optimize the cost and size of the PV system. The Perturb and Observe (P&O) Maximum Power Point Tracking (MPPT) technique is used to track Maximum Power Point (MPP) of solar PV. This technique is simple, easy to design, and less complexity. By using two-leg four-switch inverter (B-4 inverter) the cost of the PV system can be reduced compared to six switch inverters, as the cost of inverter mainly depends on the cost of semiconductor switches. The boost converter is utilized to step-up the PV voltage. This work is to analyze the Space Vector Pulse Width Modulation Technique (SVPWM) in two-leg B-4 inverter topology to reduce the ripples at time of switching thereby reducing the Total Harmonic Distortion (THD) and reducing the inverter switching and conducting losses at high pulse width modulation frequency. Moreover, SVPWM technique improves the utilization factor of B-4 inverter. The results are analyzed by using MATLAB Simulink window.
Citations
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09 Sep 2022
TL;DR: In this article , a wind power plant with an Improved Variable Step-Radial Basis Functional Network (IVS-RBFN)-based MPPT model has been developed by using MATLAB/Simulink window to analyze the significance of MPPT.
Abstract: AbstractGlobally, Renewable Energy Resources (RER) are playing a vital role in generating the electrical energy due to the conventional fossil fuel-based power plants which are harming the environment. Also, the availability of fossil fuels is going to run out. The primary resources for RER are sun, wind, hydro, and tidal. Among energy, the harnessing rate has been rapidly increased in solar Photovoltaic (PV) and wind power plants. Since sun and wind energy are abundant in nature, nevertheless, natural resources are seasonal which are varying concerning the climatic condition. Therefore, sun and wind power generators are produced fluctuating electrical energy which causes stability issues. It can be compensated by the Maximum Power Point Tracking (MPPT) technique. At present, the MPPT technique is incorporated with RER for generating maximum electrical energy based on available resources. In this manuscript, a wind power plant with an Improved Variable Step-Radial Basis Functional Network (IVS-RBFN)-based MPPT model has been developed by using MATLAB/Simulink window to analyze the significance of MPPT. The simulation results show that wind power plants are capable of generating constant power with the help of IVS-RBFN-based MPPT technique. Furthermore, the wind power output is significantly enhanced with the accurately designed boost converter.KeywordsBoost converterConvergence speedDuty cycleEnhancement of efficiencyLess steady state oscillationsPeak power pointWind plantWide output voltage
1 citations
01 Jan 2022
TL;DR: In this article , an adaptive variable step size Perturb & Observe (VSS-P&O)-based particle swarm optimization (PSO) controller is proposed as a maximum power point tracking (MPPT) controller for enhancing energy yield potential of SPV systems.
Abstract: At present, solar power generation system is the major concern in the most of the power distribution systems for satisfying future electrical energy demands. The solar photovoltaic (SPV) cell gives nonlinear output voltage characteristics. In addition, its output power varies continuously based on its different atmospheric irradiation intensity and temperature conditions. In this article, an adaptive variable step size Perturb & Observe (VSS-P&O)-based particle swarm optimization (PSO) controller is proposed as a maximum power point tracking (MPPT) controller for enhancing energy yield potential of SPV systems. Moreover, the efficiency of SPV system is low. Therefore, SPV output voltage has been significantly enhanced by the boost converter. The MATLAB/Simulink window is used to develop SPV with boost converter model which is used to investigate its performance at different atmospheric conditions.
References
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TL;DR: A modified variable step size INC MPPT algorithm is proposed, which automatically adjusts the step size to track the PV array maximum power point and can effectively improve the MPPT speed and accuracy simultaneously.
Abstract: Maximum power point tracking (MPPT) techniques are employed in photovoltaic (PV) systems to make full utilization of PV array output power which depends on solar irradiation and ambient temperature. Among all the MPPT strategies, the incremental conductance (INC) algorithm is widely used due to the high tracking accuracy at steady state and good adaptability to the rapidly changing atmospheric conditions. In this paper, a modified variable step size INC MPPT algorithm is proposed, which automatically adjusts the step size to track the PV array maximum power point. Compared with the conventional fixed step size method, the proposed approach can effectively improve the MPPT speed and accuracy simultaneously. Furthermore, it is simple and can be easily implemented in digital signal processors. A theoretical analysis and the design principle of the proposed method are provided and its feasibility is also verified by simulation and experimental results.
1,235 citations
TL;DR: A simple sine-pulse-width-modulation-based (SPWM) control strategy is proposed for the b-4 inverter topology instead of the traditional complex four-switch-based space vector techniques to make the commercial microgrid system to be cost effective and hardware optimized.
Abstract: In this paper, a four-power-semiconductor-switch-based three-phase inverter is proposed for renewable energy source integration to a generalized microgrid system. The proposed topology b-4 of three-phase inverter is investigated to make the commercial microgrid system to be cost effective and hardware optimized. A simple sine-pulse-width-modulation-based (SPWM) control strategy is proposed for the b-4 inverter topology instead of the traditional complex four-switch-based space vector techniques. The overall control structure is implemented using the Lyapunov function-based nonlinear controller to track the inverter current directly in the a-b-c frame so that a specific amount of active and reactive grid power flow to the grid can be controlled in a decoupled manner along with low total harmonic distortion of grid currents in the presence of nonlinear load at the point of common coupling (PCC). A novel technique of using the spatial repetitive controller (SRC) is also proposed to eliminate the effect of midpoint voltage fluctuation of the dc link even in the case of asymmetrically split dc-link capacitors without any extra voltage or current sensors unlike conventional methods. Detailed experimental results are provided to show the efficacy of the proposed hardware system for grid-connected applications in the microgrid.
112 citations
TL;DR: Experimental validation of the proposed utility-scale photovoltaic plant configuration based on a dc–dc stage interfaced directly to a modular multilevel converter (MMC) used for an HVdc power station is presented.
Abstract: This paper explores a utility-scale photovoltaic (PV) plant configuration based on a dc–dc stage interfaced directly to a modular multilevel converter (MMC) used for an HVdc power station. Since PV systems are dc by nature, the proposed solution has several advantages, such as full dc operation and step-up transformers avoidance with modular and reliable configuration. The contributions of this paper are the experimental validation of the proposed utility-scale configuration, while the conventional modulation stage has been further enhanced by including an adaptive phase-shifted modulation allowing improved voltage and current waveforms injected to dc grid under unbalanced power string operation. The enhanced performance is obtained by reducing the carrier frequency component of the converter voltage, generating an improved voltage ripple. Finally, experimental validation during steady-state and dynamic operation are presented to illustrate the behavior of the dc–dc MMC converter managed by the proposed modulation and control scheme.
75 citations
TL;DR: In this paper, a modified P&O method using directional step size is proposed that can effectively tackle steady state variations around maximum power point and dynamic variations in environmental conditions of temperature and solar radiation.
73 citations
TL;DR: In this paper, a phase shift carrier space vector pulse width modulation scheme based on an opposite vector voltage balancing strategy is proposed to extend the balance region of dc-link capacitor voltages for a single-phase three-level neutral point clamped cascaded rectifier (3LNPC-CR).
Abstract: A phase shift carrier space vector pulse width modulation scheme based on an opposite vector voltage balancing strategy is proposed to extend the balance region of dc-link capacitor voltages for a single-phase three-level neutral point clamped cascaded rectifier (3LNPC-CR). The internal-module and mutual-module 3LNPC-CR balancing strategies are simultaneously applied to improve the voltage balancing capacity when the dc loads are unbalanced. The voltage balance boundaries of three space vector pulse width modulations using the traditional strategy, the zero vector strategy, and the opposite vector strategy are compared. The analysis results indicate that the proposed modulation algorithm maintained balanced voltages for all modules even if one load of the module was removed. Meanwhile, the equalization of the neutral point voltage for the single-phase 3LNPC-CR was also achieved. Finally, the voltage balancing capacity and rectifier performance of the proposed strategy was verified by simulations and experiments.
25 citations