Maximum Efficiency Operation in Wider Output Power Range of Wireless In-Wheel Motor with Wheel-Side Supercapacitor

2018 ◽  
Author(s):  
Kensuke Hanajiri ◽  
Katsuhiro Hata ◽  
Takehiro Imura ◽  
Hiroshi Fujimoto
Keyword(s):  
Output Power ◽  
Maximum Efficiency ◽  
Wheel Side

scholarly journals A Frequency Locking Method for ICPT System Based on LCC/S Compensation Topology

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2626
Author(s):  
Yansong Li ◽  
Minhao Wang ◽  
Weiwei Zhang ◽  
Mengmeng Zhao ◽  
Jun Liu
Keyword(s):  
Output Power ◽  
Power Transmission ◽  
Transmission Efficiency ◽  
Maximum Efficiency ◽  
Initial Value ◽  
Frequency Locking ◽  
Inductively Coupled ◽  
Output Characteristics ◽  
The Relationship

Aiming to maximize the transmission efficiency of inductively coupled power transmission (ICPT) system with the designed output power, a frequency locking method for an ICPT system based on LCC/S compensation topology is proposed in this paper. Firstly, the relationship between compensation component Lf1 and output power was deduced by the lossless model, and the initial value of Lf1 was obtained. Then, considering the system loss, the designed output power and frequency were input into the frequency locking program, and Lf1 and other compensation parameters were dynamically tracked. At the same time, the transmission efficiency of the system was calculated, and the frequency that achieved maximum efficiency was automatically locked when the system met the requirements of the designed output power. Finally, based on the method, the output characteristics of the system were verified by experiments.

Modeling and Simulation of MPPT-SEPIC Combined Bidirectional Control Inverse KY Converter Using ANFIS in Microgrid System

2016 ◽  
Vol 1 (2) ◽  
pp. 264 ◽  
Author(s):  
Soedibyo Soedibyo ◽  
Farid Dwi Murdianto ◽  
Suyanto Suyanto ◽  
Mochamad Ashari ◽  
Ontoseno Penangsang
Keyword(s):  
Energy Storage ◽  
Output Power ◽  
Distribution System ◽  
Maximum Output Power ◽  
Optimization Method ◽  
Photovoltaic System ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Pv System ◽  
Excess Power

<em>Photovoltaic system (PV) is widely used in various renewable energy application. The main problem of PV system is how to get the maximum output power which is integrated in microgrid system. Furthermore, the redundancy output power generated by on a distribution system should also be considered. This study utilizes the excess power for energy storage using bidirectional of KY inverse</em> <em>converter. Since the DC voltage which generated by PV and the energy storage will be converted into AC voltage using inverter toward load. This paper proposes ANFIS as search optimization method using SEPIC converter with a maximum efficiency of 99.95%</em> to impact to power generation performance  in microgrid system.

scholarly journals Highly Efficient Target Power Control for Two-Receiver Wireless Power Transfer Systems

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2726 ◽  
Author(s):  
Weikun Cai ◽  
Dianguang Ma ◽  
Houjun Tang ◽  
Xiaoyang Lai ◽  
Xin Liu ◽  
...  
Keyword(s):  
Output Power ◽  
High Efficiency ◽  
Impedance Matching ◽  
Wireless Power Transfer ◽  
Mutual Inductance ◽  
Maximum Efficiency ◽  
Power Transfer ◽  
Wireless Power ◽  
Target Power ◽  
Target Output

Multiple-receiver wireless power transfer (MRWPT) systems have revolutionary potential for use in applications that require transmitting power to multiple devices simultaneously. In most MRWPT systems, impedance matching is adopted to provide maximum efficiency. However, for most MRWPT systems, achieving target power levels and maximal efficiency is difficult because the target output power and maximum efficiency conditions are mostly not satisfied. This study establishes a target power control (TPC) strategy to balance providing target transfer powers and operating under high efficiency. This study is divided into the following points: First, this study derives the optimal mutual inductance to verify that it’s difficult for two-receiver wireless power transfer (WPT) system to achieve both maximum efficiency and power distribution simultaneously; Second, this study illustrates that for impedance matching method the mutual inductances play a more important role than equivalent impedances in increasing the system efficiency, and hence system should give priority in improving the mutual inductance as large as possible; Third, this study proposes a simplified system model which helps to derive the analytic solutions of equivalent impedances; Fourth, this study developed a 100-kHz two-receiver WPT system and establishes a TPC strategy for enabling the system to achieve target output power levels with high efficiency; At last, the proposed system is proved to achieve an efficiency level of more than 90 % and satisfies the target output power levels requirements.

Efficiency and Optimal Loading of Contra-Rotating Marine Turbines

2011 ◽  
Author(s):  
Wei Xu ◽  
Spyros A. Kinnas
Keyword(s):  
Output Power ◽  
Maximum Output Power ◽  
Optimization Method ◽  
The Self ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Optimum Ratio ◽  
Line Model ◽  
Performance Effects ◽  
Lifting Line

In this paper, an optimization method is developed for determining the loading on each component, which leads to the maximum efficiency (i.e. maximum output power) of a contra-rotating turbine when subject to uniform inflow. The lifting line model is adopted and both the self-induced velocities and the interaction induced velocities between the front and the back components are included. The optimum ratio of rotational velocities for reducing the torque on support structures and the performance effects of the gap distance between two components are investigated. The optimum distance for two in-line turbines in a turbine farm is also analyzed.

scholarly journals Highly efficient 3-stage Doherty power amplifier using gate bias adaption

2010 ◽  
Vol 3 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Ildu Kim ◽  
Junghwan Moon ◽  
Jungjoon Kim ◽  
Seunghoon Jee ◽  
Junghwan Son ◽  
...  
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Peak Power ◽  
Average Power ◽  
Maximum Efficiency ◽  
System Specification ◽  
Average Output ◽  
Highly Efficient ◽  
Doherty Power Amplifier ◽  
Power Region

This paper demonstrates a highly efficient 3-stage Doherty power amplifier (PA) employing an envelope tracking (ET) technique. The ‘3-stage’ Doherty PA is the most efficient architecture for a high peak-to-average power ratio (PAPR) signal among the various Doherty PAs. However, because of the lower peaking biases than those of the ‘N-way’ Doherty PA, the proper load modulation is hard to be achieved. To get proper modulation, the peaking PAs' gate biases have been adaptively controlled using the ET technique, and the peak power and maximum efficiency characteristic along the backed-off output power region is successfully achieved. By ADS and Matlab simulations, the overall behavior of the 3-stage Doherty PA employing the ET technique has been fully analyzed. To maximize the overall efficiency of the proposed 3-stage Doherty PA, the unit PA has been designed using class F−1 PA. For verification, the amplifier is implemented using 5 W and 10 W PEP LDMOSFETs for the 802.16e mobile world interoperability for microwave access (WiMAX) at 1 GHz with a 8.5 dB PAPR. The measured drain efficiency of the proposed 3-stage Doherty PA is 55.5% at an average output power of 37 dBm, which is a 7.54 dB backed-off output power. The digital feedback predistortion (DFBPD) algorithm has been used to linearize the proposed PA considering the ET technique. After linearization, the −33.15 dB of relative constellation error (RCE) performance is achieved, satisfying the system specification. These results show that the 3-stage Doherty employing the ET technique and saturated PA is the most suitable PA for the highly efficient and linear transmitter.

scholarly journals Pengaruh Gas C02 dan Refrigeran Dalam Udara Terhadap Efisiensi PLTS (Pembangkit Listrik Tenaga Surya)

2020 ◽  
Vol 17 (2) ◽  
pp. 214
Author(s):  
Muh. Yusuf Yunus ◽  
Laurasti Aswindah Sari
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Output Power ◽  
Electrical Energy ◽  
Input Power ◽  
Maximum Efficiency ◽  
Solar Power Plant ◽  
Co2 Gas ◽  
Power Increase ◽  
Over Time

Application of sunlight energy every time is increasing along with the knowledge that continues to develop over time. One of the sources of solar energy is the Solar Power Plant (PLTS) which uses solar energy for electrical energy. The purposes of this research are to study the effect of CO2 gas for increasing the energy of PLTS and to find the effect of refrigerant gas on the efficiency of PLTS. Data is collected in an integrated electrical laboratory, the data are the voltage, current and intensity of solar radiation. Then the input power, output power and efficiency are calculated. The results of this study are the effect of CO2 gas on the efficiency of PLTS was not affect the efficiency of PLTS, namely the light intensity of 100 W / m2 to 380 W / m2 with a gas contribution of 5% and 10%, can be seen that if output power increase, the efficiency of PLTS is also increase. When using CO2 gas, the efficiency of PLTS almost the same as normal conditions (without gas).  The effect of the refrigerant gas mixture was not enfluence the efficiency of PLTS. When using refrigerant gas of 5% and 10% both R22 and R134 the efficiency of PLTS was the same with CO2 gas which its efficiency almost the same as normal conditions (without gas). Data with the intensity of solar radiation 100 W/m2 in normal conditions (without gas) the maximum efficiency that can be obtained is 9.085917% with an output power of 1.061917 watts, when R134 and R22 gas were added at PLTS, it was obtained  maximum efficiency at R134 (13,624637% )

scholarly journals Design and simulate a doherty power amplifier using GaAs technology for telecommunication applications

2019 ◽  
Vol 15 (2) ◽  
pp. 845
Author(s):  
Ehsan Barmala
Keyword(s):  
Output Power ◽  
Power Amplifier ◽  
Power Amplifiers ◽  
High Efficiency ◽  
Maximum Output Power ◽  
Input Power ◽  
Power Divider ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Doherty Power Amplifier

<span>In this paper, a Doherty power amplifier was designed and simulated at 2.4 GHz central frequency which has high efficiency. A Doherty power amplifier is a way to increase the efficiency in the power amplifiers. OMMIC ED02AH technology and PHEMT transistors, which is made of gallium arsenide, have been used in this simulation. The Doherty power amplifier unique feature is its simple structure which is consisting of two parallel power amplifiers and transmission lines. In order to integrate the circuit, the Doherty power transmission amplifier lines were implemented using an inductor and capacitive components. Also, the Wilkinson power divider is used on the chip input. To improve the efficiency, the auxiliary amplifier dimensions is selected enlarge and the further input power is allocated it by the power divider. A parallel R-C circuit has been used at the input of transistors to improve their stability. Simulation results show that the Doherty power amplifier has 17.2 dB output power gain, 23 dBm maximum output power, and its output power P<sub>1dB</sub> =22.6dBm at compression point -1 dB, also, its maximum efficiency is 55.5%.</span>

Estimation of Cumulative Output Energy of Oscillating Water Column Wave Energy Converter Considering Power Take Off Damping

2020 ◽  
Author(s):  
Mitsumasa Iino ◽  
Takeaki Miyazaki ◽  
Makoto Iida
Keyword(s):  
Water Column ◽  
Output Power ◽  
Wave Period ◽  
Maximum Efficiency ◽  
Water Tank ◽  
Oscillating Water Column ◽  
Energy Converter ◽  
Air Power ◽  
Wave Condition ◽  
Wide Range

Abstract The objective of this study is to investigate the influence of damping from the PTO device on the cumulative output of the oscillating water column wave energy converter under real sea conditions which encompasses wide range of wave period and height. In this presentation, a time domain dynamic simulation model of OWC motion is developed and validated with water tank test results. Then the model is used to calculate a wide range of wave period and height. Finally, annual cumulative air power output of OWC is calculated with different damping values. In the water tank experiment, a cylindrical oscillating water column with a diameter of 0.3 m and submerged depth of 0.2 m is tested. PTO damping was emulated by using several orifice plates. Since the orifice pressure is proportional to square of flow-rate of the orifice, In the simulation, a model was constructed to solve the dynamic equation of motion assuming water column as a rigid equivalent floating body. Validation showed the model captures the influence of PTO damping as observed in the water tank testing. Using simulation, output air power from real scale OWC was evaluated under wide range of inlet wave period and height. With the output power database from dynamic simulation and frequency of wave height and period at specific sites in Japan (Fukui and Kamaishi), annual cumulative output power is calculated. From the results, it was confirmed that a higher output can be obtained with higher energy in high waves by adopting a damping characteristic that increases the efficiency under a wide wave condition rather than a nozzle characteristic that achieves maximum efficiency in the resonance period. Furthermore, it became clear that the damping that increases the maximum efficiency does not necessarily increase the accumulated energy. When considering operation in real sea condition in the future, it is not always effective to select PTO damping that maximizes the output at specific wave height or period. And it is important to adopt a method that can estimate wide range of wave condition and evaluate the cumulative output power.

scholarly journals A New Optimization Approach for Maximizing the Photovoltaic Panel Power Based on Genetic Algorithm and Lagrange Multiplier Algorithm

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Mahdi M. M. El-Arini ◽  
Ahmed M. Othman ◽  
Ahmed Fathy
Keyword(s):  
Genetic Algorithm ◽  
Output Power ◽  
Lagrange Multiplier ◽  
Electric Energy ◽  
Optimal Solution ◽  
Maximum Efficiency ◽  
Initial Population ◽  
Optimization Approach ◽  
Optimal Point ◽  
Pv Panel

In recent years, the solar energy has become one of the most important alternative sources of electric energy, so it is important to operate photovoltaic (PV) panel at the optimal point to obtain the possible maximum efficiency. This paper presents a new optimization approach to maximize the electrical power of a PV panel. The technique which is based on objective function represents the output power of the PV panel and constraints, equality and inequality. First the dummy variables that have effect on the output power are classified into two categories: dependent and independent. The proposed approach is a multistage one as the genetic algorithm, GA, is used to obtain the best initial population at optimal solution and this initial population is fed to Lagrange multiplier algorithm (LM), then a comparison between the two algorithms, GA and LM, is performed. The proposed technique is applied to solar radiation measured at Helwan city at latitude 29.87°, Egypt. The results showed that the proposed technique is applicable.

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