1,721,042 research outputs found
Multistage switched inductor boost converter for renewable energy application
No full textIn this paper Multistage Switched Inductor Boost Converter (Multistage SIBC) is uttered for renewable energy applications. The projected converter is derived from an amalgamation of the conventional step-up converter and inductor stack. The number of inductor and duty ratio decides the overall voltage gain of the projected converter. The projected converter consists of only one controlled power semiconductor device. The 50 KHz frequency is adopted to reduce the L, C value and to suppress the output waveform ripples. The analysis and working of projected converter is discussed in detail. Simulation of the projected converter for three stages is done in Matlab/Simulink (version-2016) and the results are verified with theoretical values
A high gain modified SEPIC DC-to-DC boost converter for renewable energy application
No full textThe proposed work present the modified high gain Single Ended Primary Inductance Converter (SEPIC) for renewable energy applications. The voltage gain of proposed converter is very highly related to conventional dc-to-dc converter and recently projected converter based on conventional converter. The key feature of projected converter is only one controlled device and voltage gain is increased without using a transformer and coupled inductor structure. The voltage gain of projected converter is increased by 10 times compared to the SEPIC converter by adding one extra inductor and capacitor in SEPIC converter for a duty ratio of 90%. The detailed analysis of the voltage gain with the voltage drop across passive device and working of projected converter is deliberated in details in the paper. The projected converter is simulated in Matrix Laboratory software (2014). The simulation results validate the feasibility of projected converter
A new voltage doubler based DC-DC 2LCm-Y power converter topologies for high-voltage/low- current renewable energy applications
Full text linkIn this treatise, a new voltage doubler based DCDC 2LCm-Y power converter topologies are uttered for the high voltage/low-current renewable energy applications. L-Y, 2L-Y, 2LC-Y and 2LCm-Y power converter categories are recently proposed in the existing X-Y converter family. To provide an effective and viable solution to renewable energy system; four new voltage doubler based converters (2LCm-LVD, 2LCm-2LVD, 2LCm-2LCVD and 2LCm-2LCmVD converters) are proposed in 2LCm-Y converter category. The proposed converters are well suited for renewable energy applications which required high output voltage power converter such as a Photovoltaic Multilevel DC-AC converter system, renewable High Voltage Direct Current (HVDC) applications, Hybrid Electric Vehicles (HEV) etc. The perceptible characteristics of proposed 2LCm-Y power converter topologies are presented in detail. Working of 2LCm-Y proposed converters with the derivation of VO/Vin is discussed in detail. Proposed converter topologies are simulated in the Numerical Computing Matrix Laboratory 9.0 (R2016a) software. The simulation results are discussed in details and it constantly showed the high- quality agreement with hypothetical analysis and validates the functionality and characteristics of the proposed 2LCm-Y converter topologies of X-Y converter family
On the structural implementation of magnetic levitation windmill
No full textIn this article structural implementation and optimum performance of Vertical Axis Wind Turbine (VAWT) using magnetic levitation technology is articulated. With the positivity of customary VAWT, the surplus advantages like spinning at low wind-speed, higher efficiency, low noise emission, etc. are also quantified. The leading result ascending before traditional wind turbine can be demarcated as energy dissipation during rotation. By means of property of permanent magnet as an alternate of ball bearings, levitation of the turbine is anticipated with decline in damages while rotation and hence wind turbine blades are positioned on a shaft for attaining stability throughout rotation. Power is then generated with an axial flux generator, which incorporates the utilization of permanent magnets and set of coils
Realization of 5-bus system using soft computing technique for flexible alternating current transmission system (FACTS) devices
No full textTotal transfer capability analysis of power system is currently a critical issue in both planning & operating of systems. These issues mainly occur due to increase in area and interchanges among utilities. To reduce the flows in heavily loaded lines, Flexible Alternating Current Transmission System (FACTS) devices is used, this results in increased transfer capability, improve stability of the network, low system losses, and fulfill contractual required by controlling the power flows in the network. To achieve parameters FACTS devices are placed optimally and is done with the help of reduction of total system reactive power loss sensitivity indices analysis method and real power flow performance index sensitivity indices analysis method. Thyristor-Control-Series-Capacitor (TCSC) is used as a FACTS device in the proposed sensitivity analysis method. To decide priority of line for placing TCSC, soft computing technique "Fuzzy logic method" is employed. The performance evaluation of proposed sensitivity analysis methods is done using electrical IEEE-5 bus system. The sensitivity indices are programmed using Matrix Laboratory
Hybrid non-isolated and non inverting Nx interleaved DC-DC multilevel boost converter for renewable energy applications
Full text linkIn this paper hybrid non isolated/ non inverting Nx interleaved DC-DC multilevel Boost Converter for renewable energy applications is presented. The presented hybrid topology is derived from the conventional interleaved converter and the Nx Multilevel boost converter. In renewable energy applications, generated energy cannot be directly used at application end. In most of the cases it needs to be stepped up with DC-DC converter at operating voltage levels as per the requirement of the application. Though conventional boost converter can theoretically be used for this purpose, but obtaining such high gain implies that boost converter should operate at it its maximum duty cycle, which is not feasible due to the great variations in the output voltage caused by small variations in the duty cycle, leading the boost converter to instability and also increases the voltage stress across switches. The advantages of presenting topology of DC-DC converter are high voltage conversion, reduce ripple, low voltage stress, non inverting without utilizing the high duty and transformer. The main advantage of presented topology is more number of levels can be increased by adding capacitor and diode circuitry to increase the voltage gain without disturbing the main circuit. Moreover, the presented topology is compared with several recent high gain converters. The proposed topology is simulated in MATLAB/SIMULATION and results will verify the validity of the design and operation of the converter
Electric field analysis of extra high voltage (EHV) underground cables using finite element method
No full textTransmission and Distribution of electric power through underground cables is a viable alternative to overhead lines, particularly in residential or highly populated areas. The electrical stresses are consequences of regular voltages and over voltages and the thermal stresses are related to heat produced inside the conductor due to flow of high rated current which is the main factors that affect its reliability. The performance of these underground power cables is important for proper operation of the power system. Long-term problems with them are related to the degradation of polymer materials used for the insulator due electrical, thermal or environmental stress. Most of these problems are related to the electric field stress on the insulation of the underground cables. The objective of the electric field analysis by using different numerical techniques is to find electric field stress and other parameters, which are an inevitable tool in various electricity concerned technologies; in particular for analyzing discharge phenomenon and designing Extra High Voltage (EHV) underground cables. In this paper Finite Element Method (FEM) numerical method has been discussed and used to find 2-D electric field stress and other parameters of EHV underground cables with given boundary conditions using 2-D electric field analysis software package (IES-ELECTRO module) which is based on the finite element method (FEM)
A novel 2L-Y DC-DC converter topologies for high conversion ratio renewable application
No full textThe projected 2L-Y DC-DC Converter topologies are new members of the XY converter family. The 2L-Y converter is a combination of two single stage converters consisting, one is 2L converter and another is Y converter. Based on the configuration of Y converter four new topologies called a 2L-LVD converter, 2L-2LVD converter, 2L-2LCVD converter and 2L-2LCmVD converter are derived, discussed and analyzed in this paper. Due to higher conversion ratio capability of the proposed 2L-Y converter, it provides a workable solution for photovoltaic and electrical drive applications. The striking features of 2L-Y converter topologies are only one controlled device, negative output, Transformer-less topology, compact structure and having a minimum internal resistance. The proposed 2L-Y converters are simulated into MATLAB and simulation results are confirmed the theoretical analysis
Dual Six-Phase Multilevel AC Drive with Single Carrier Optimized Five-Level PWM for Star-Winding Configuration
No full textThis article presents new multilevel modulation strategy based on single carrier-based pulse-width modulation for dual six-phase (twelve-phase) symmetrical/asymmetrical star-end winding converter. The four standard voltage source inverters with one bidirectional switch (MOSFET/IGBT) per phase constitute the power circuit. Further, through the two capacitor bi-directional switch link the neutral link. An algorithm-based single carrier zero-shifted five-level modulation (SCZSFM) modulates each two-level VSI as a five-level output multilevel inverter. The complete AC drive is numerically modelled in MATLAB/PLECS software and tested for predicting theoretical background
Hexuple-Inverter Configuration for Multilevel Nine-Phase Symmetrical Open-Winding Converter
No full textHexuple-inverter configuration for multilevel nine-phase symmetrical open-winding ac converter is articulated in this work. Power modular unit consists of six classical three-phase voltage source inverters (VSI). Each VSI includes one bi-directional device (MOSFET/IGBT) per each phase and link to two capacitors for neutral connection. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as 5-level multilevel inverter (MLI). Set of test results are presented, which are observed from the model based developments in numerical simulation software’s (Matlab/PLECS). Results always showed good conformity with the developed theoretical background under working conditions. The proposed converter found suit for (low-voltage/high current) electric vehicles, ac tractions and ‘More-Electric Aircraft’ applications
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