5 research outputs found
The Impact of Photovoltaic Systems on the Performance of Induction Motor in Agricultural Irrigation Applications
Get PDFWater is a vital resource in the agricultural sector, as most farmland relies on tubewells for irrigation. Solar photovoltaic pumping systems (SPVPS) have emerged as a promising solution for sustainable agricultural irrigation, providing clean and efficient alternatives to traditional energy sources. However, induction motors used in (SPVPS) suffer from problems including voltage instability, decreased efficiency, overheating, and mechanical stress due to the varying nature of PV electricity. This paper focuses on the analysis of an irrigation system by MATLAB/Simulink simulation environment to analyze the performance of (SPVWPS), which consists of a 22 kW three-phase induction motor connected to a photovoltaic system under the climatic operating conditions of Mosul, Iraq. The results showed that operating the water pump using the solar system led to a decrease in the motor torque by 9% and the motor efficiency decreased by 34.3% compared to when supplied with electrical power from the grid. The results showed that the system achieved its best performance at a peak of the solar irradiance of 860 W/m² and a temperature of 24.6°C, with the induction motor speed reaching 1,317 rpm and a maximum efficiency of 48.4%. The total harmonic distortion (THD) in the rotor current peaked at 184.37% at 24°C before decreasing to approximately 45.3% at higher temperatures. The increased THD is due to a combination of inverter stress, poor waveform quality under thermal load, and high-frequency disturbances caused by variable environmental conditions. It’s a typical challenge in solar-powered motor drives, especially in off-grid or remote agricultural systems. These results effectively contribute to supporting sustainable agricultural practices by ensuring the continuity and efficiency of motor operation
Influence of reactive power compensation from PV systems on electrical grid
Get PDFThe rising electricity consumption, rapid fossil fuel depletion, and a higher shift to the use of renewable or green energy resources have increased the need to integrate renewable and distributed energy resources (DERs), like solar photovoltaic (PV) energy to power the utility grids. In this study, the researchers have determined the effect of PV inverters to offer reactive power to an adapted IEEE 13-node distribution network. Power flow analyses were conducted on MATLAB/Simulink for various reactive power modes of PV inverters to show the effect of the reactive power on the regulation of grid voltage, reduced the total harmonic distortion (THD), and maintain the power factor so as to improve the ability of the system to handle power. The result shows that using a 400 KW PV system in a bus (675) led to a reduction in the power generated from the generator by 11%, and the use of the reactive power capability of PV inverters on-site improved the voltage profile significantly. as well, reduced the voltage THD by 27.09% when injected with reactive power, reduce the current THD by 77.39% When absorbing reactive power, and improved the power factor on-site
Assessment of the efficiency and performance of different PV system configurations under various fault conditions
Get PDFPartial shadowing, bypass-diode issues, photovoltaic (PV) module deterioration, and wiring issues are examples of PV failures that have a substantial effect on power production and cause distinct peaks in a PV system's P-V curves. Various PV fault types have been used in the solar cell system in this work. Four types were used: open circuit, line to ground, cross-line to line, and intra-line to line. The impact of various PV system failure types on the system's performance was emphasized in this study. MATLAB is used to display the simulation results for the four approaches (series parallel (SP), total cross tied (TCT), honeycomb (HC), and bridge link (BL)) under various fault scenarios. The current-voltage (I-V) and power-voltage (P-V) curves are used to compare the results for each fault scenario. The open circuit fault between PV (7.8) in the first string and PV (18.19) in the fourth string resulted in a 40% decrease in the short-circuit current of the photovoltaic system compared to its normal value in the SP topology, while in the HC and BL topologies, the current value exceeded the allowable limit. This, in turn, had an impact on the (I-V) characteristics of this topology. The fault's impact was minimal and within the typical bounds of its (I-V) characteristics in the TCT topology
Mitigating mismatch power losses in photovoltaic systems under partial shading: a comparative study of series-parallel and alternative configurations
Get PDFUtilizing the photovoltaic effect, photovoltaic (PV) systems are a popular technique for capturing solar energy and turning sunlight into electricity. However, environmental factors, especially shade, significantly impact photovoltaic system efficiency. Shadows cast on PV panels by surrounding structures, trees, accumulated dirt, clouds, and debris can seriously impair their performance. The purpose of this study was to investigate how shade affects photovoltaic systems utilized in residential settings. Series-parallel (SP) topology for PV system have been investigated. Additionally, in this work, a PV system of 5 kW of the residence home has been proposed and multi cases of shading examined. Through the results obtained when partial shading was applied, it was found that the highest efficiency of the system was when partial shading irradiance (Ir = 500 W/m2) was applied to one column (5 modules) as 82.84%, while the worst and least equipped case was when the shading was applied to the corners and random shading at (8 modules), where the efficiency decreased to approximately 39.24% and 40.64% respectively
Effect of Reactive Power Capability of the PV Inverter on the Power System Quality
Get PDFDistributed generation (DG) based on a photovoltaic system (PV) connected to a power system is a very promising solution to meet the present demand for energy and to reap the advantages of using clean energy. With the exponential increase in the deployment of distributed energy sources based on renewable energy, the reactive power drawn from the grid has increased dramatically compared to the active power. This affects the quality of the power from the network. Reactive power is usually required to regulate the power factor and the grid voltage so as to improve the ability of the system to handle power. In this paper, the reactive power capacity of a PV inverter connected to the grid was determined using the MATLAB/Simulink program. The power (active and reactive) injected into the network were independently controlled by their reference values. A study was conducted on the effects of the injection/absorption of reactive power on the quality of power under different operating conditions
