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Photovoltaic (PV) model can be a viable alternative to the conventional look-up-table as an accurate and versatile solar array simulator (SAS) engine. In PV model-based SAS, PV model has a critical role to generate appropriate I-V characteristic of the PV panel under rapidly varying temperature and irradiation, and its calculation speed as well as accuracy are key performances. In this paper, a novel...
In a transformerless inversion system, the suppression of common mode leakage current is one of the most important issues concerned. Several single phase full bridge PV inverters have been proposed to eliminate the leakage current. However, in the three phase applications of the PV inverters, few attentions have been paid on the improvement of leakage current from a topological point of view. This...
This paper proposes a low voltage ride through (LVRT) control strategy for energy storage systems (ESSs). The LVRT control strategies for wind turbine systems and photovoltaic systems have been researched until now. Regardless of the energy source, the main aim of the LVRT control strategies for a grid side converter is to inject the reactive power according to the gird code regulations. The main...
This paper proposes a parallel-connected system where two three-phase three-level T-Type photovoltaic inverters with common ac and dc sides to improve the power rating. However, zero-sequence circulating currents (ZSCCs) will occur, which will distort currents, decrease efficiency, and increase loss. In this paper, the fundamental mechanism of ZSCCs based on the derived model of ZSCCs is analyzed...
Due to high penetration of distributed generation units in power system, fault ride through (FRT) capability is one of the new requirements of the medium-scale grid-tied photovoltaic power plants (PVPPs). This paper proposes and investigates a control strategy for the neutral-point-clamped (NPC) inverter in order to inject proper unbalanced reactive currents to the grid during unbalanced grid faults...
Use of renewable sources of energy for charging of electric vehicle(EV) batteries have generated tremendous interest. The use of off-board DC chargers to reduce the weight and increase space inside an electric vehicles has been an important area of interest. Harvesting solar energy to charge electric vehicle batteries can result in large inefficient systems when multiple power conversion stages are...
In this paper, a method of optimizing efficiency of hybrid photovoltaic-grid power system by changing dc bus voltage is introduced. The hybrid photovoltaic-grid power system composed of a solar cell, grid, DC bus, solar cell interface converter (Boost + full-bridge LLC resonant converter), grid interface converter (single-phase PWM rectifier) and load interface converter (half-bridge LLC resonant...
A theoretical and experimental analysis of a thermal-photovoltaic panel, whose purpose is to produce both electrical and thermal energy, has been performed. In order to achieve the main objective, the different components that constitute the thermal-photovoltaic panel have been studied and a simulation model of the proposed thermal-photovoltaic panel has been developed; then, the simulated values,...
This paper proposes a control scheme composed by a linear control and a predictive algorithm with extended horizon for a three-level neutral-point-clamped (NPC) inverter topology for grid-tie photovoltaic applications. The proposed strategy is capable to balance the capacitor voltages at the DC link and to generate a sinusoidal current at the grid side with a unitary power factor. Differently to other...
The use of multilevel inverters in Photovoltaic (PV) applications have attracted major attentions in both industry and academic research. This paper presents a PV system based on a single-phase Quasi-Z-Source (QZS) multilevel inverter with a great reduction in number of switches. The introduced inverter is based on a Multilevel DC link (MLDCL) structure and an H-bridge inverter. The MLDCL consists...
This paper presents a stand-alone photovoltaic (PV) generation system based on an asymmetric cascade H-bridge (ACHB) converter. The system is composed of two H-bridge converters (A and B) series connected, supplying an ac load. To maximize the number of voltage levels, the dc-link voltage ratio is 3:1. The higher dc-link voltage (converter A) is connected to PV panels, and two options are presented...
The maximum power generated by a photovoltaic (PV) system depends on the intensity and uniformity of the irradiation over panels. The Maximum Power Point Tracking (MPPT) is a control technique used to adjust the operating voltage of PV panels in order to continuously harvest the maximum power available. Modeling of PV panel characteristic curves are useful for the evolution of MPPT control algorithms...
In this work it is presented a theoretical and experimental investigation of the influence of the low power oscillation due to the pulsating single-phase energy flow in a H-bridge voltage source inverter that operates connected to the grid and is fed by photovoltaic (PV) panels. That oscillation can be responsible for efficiency reduction of PV generators connected to the DC-bus of the inverter, as...
The photovoltaic-battery hybrid power system is a kind of flexible renewable power generation system, which is composed of a photovoltaic array and a battery connected to an output DC bus via power converters. The system can work with multiple structures and multiple operating modes due to the source and load states. Particularly, the nonlinear nature of the constant power load will destablize the...
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