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Showing papers presented at "International Conference on Power Electronics Systems and Applications in 2017"


Proceedings ArticleDOI
01 Dec 2017
TL;DR: Considering the feedbacks from the 18 railway administrations, 6C system realizes a fine-grained detection and diagnosis of the pantograph-catenary and greatly improves the detection efficiency and a huge economic and social benefit has been earned.
Abstract: In the traction supply system, most of the defects come from pantograph-catenary system. Due to the violent vibration of the catenary and the violent arc in the pantograph-catenary, the collapse and short circuit of the catenary perhaps take place and interfere or even threaten the safe operation of the vehicles. In the past decades, the detection of pantograph-catenary is performed manually. 40 thousand railway personnel climb onto the support devices to check the potential defects during night. With the rapid growth of the China high-speed railway's mileage, to ensure the safe operation of the high-speed railway and eliminate the hidden danger of the workers, an automatic detection system is established to report all of the potential defects and evaluate the health of the pantograph-catenary. To achieve the overall and real-time detection, the working period and installation positions of the 6C equipment are carefully designed. Meanwhile, a three-level hierarchy is built to transfer and process the big data from the local administrations to the China Railway Corp., which is a unified framework in the nation. China Railway Corp. also enacts eight requirements for the pantograph-catenary detection system. 6C system can measure the dynamic and static geometry parameters and the current collection, and detect the defective working states of the components and the operation condition of the pantograph-catenary. Considering the feedbacks from the 18 railway administrations, 6C system realizes a fine-grained detection and diagnosis of the pantograph-catenary and greatly improves the detection efficiency. In addition, a huge economic and social benefit has been earned.

32 citations


Proceedings ArticleDOI
Ying Xu1, Chen Biyun1, Shan Xin1, W.H. Jia1, Zefeng Lu1, Gang Xu1 
01 Dec 2017
TL;DR: A controller for lane keeping system (LKS) is presented, and the method of the reference trajectory generation is interpolating five preview points obtained by sensors, which shows that the MPC controller is suitable for reducing the lateral displacement and achieving better performance.
Abstract: This paper presents a controller for lane keeping system (LKS), and the method of the reference trajectory generation is interpolating five preview points obtained by sensors Its mean purpose is to reduce the demand for sensors by only using five points Also the distance between these five preview points is determined by the longitudinal velocity The computation of the controller has been achieved by casting the model predictive control (MPC) for tracking problem into the quadratic programming (QP) problem The steering angle is minimized to generate the optimal control sequence and the effectiveness and robustness of the proposed approaches are demonstrated through co-simulations of Matlab/Simulink and CarSim under the different velocity And the simulation results show that the MPC controller is suitable for reducing the lateral displacement and achieving better performance

22 citations


Proceedings ArticleDOI
X. Q. Li1, Li Qiu1, S. Aziz1, J. F. Pan1, J. P. Yuan1, Bo Zhang1 
01 Dec 2017
TL;DR: Simulation results show that UAV combined with RRT∗ planner can achieve track task successfully in complex environments.
Abstract: In this paper, RRT∗ algorithm is applied to the navigation of UAV for tracking a target in obstacle environment Planning route generated by RRT∗ algorithm used for flight control of UAV RRT∗ algorithm is extended to include a track mission considering differential constraints of Quadrotor and the cluttered environment Paper presents the algorithm flow of RRT∗ and the dynamic models of UAV Simulation results show that UAV combined with RRT∗ planner can achieve track task successfully in complex environments

14 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this paper, the configuration of the solar power system for sea water is examined and the solar cells design, connection power distribution, protection, environment impact and shore side power management are discussed.
Abstract: Solar power installed in sea water has advantages as compared to installed on lands such as good and unshaded solar source by buildings or plants, better cooling, good utilization of surface than lands, but it also suffers from other scenario such as the sea water corrosion, wave and tidal disturbance. The present paper is to discuss the project for the sea water solar power generation. The configuration of the solar power system for sea water is examined. The solar cells design, connection power distribution, protection, environment impact and shore side power management are discussed. The power delivery using V2X is proposed.

14 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: Three basic dc converters-buck, boost, and buck-boost converter are analyzed in this article and the averaged models of PWM switch both in CCM and DCM are developed first to simplify analysis ofdc converters without considering nonlinear P WM switch action.
Abstract: Three basic dc converters-buck, boost, and buck-boost converter are analyzed in this article. Instead of deriving state-space equations of converters, the averaged models of PWM switch both in CCM and DCM are developed first. The models enable to simplify analysis of dc converters without considering nonlinear PWM switch action. Incorporate PWM switch models into power stage circuits, steady-state and small-signal models of the converters can be obtained both in CCM and DCM. The criteria of judging DCM of dc converters are also developed. Finally. small-signal models are verified by comparing frequency response from small-signal model and that from PSIM AC Sweep simulation.

13 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: In order to adapt to the policy of electricity reform and to improve the prediction accuracy of short-term power load, a demand response model is introduced, and the influencing factors of demand response are introduced in the traditional input.
Abstract: In order to adapt to the policy of electricity reform and to improve the prediction accuracy of short-term power load, a demand response model is introduced, and the influencing factors of demand response are introduced in the traditional input. According to the Elman neural network is easy to fall into local extremum, improve its incentive function to optimize the prediction model. In order to establish the Elman neural network model for short term load forecasting based on improved demand response factor.

11 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: Experimental results demonstrate that a better adjustable condition for crops can be achieved for the proposed greenhouse system and proves that the designed greenhouse intelligent control system has the characteristics of stable performance, convenience and versatility, etc., and the proposed scheme is worthwhile to be applied in the future.
Abstract: An intelligent greenhouse control system based on the (programmable logic controller) PLC and Kingview has been designed to meet the needs of crops greenhouse. Aiming at the problem of the greenhouse control system that is difficult to achieve a precise control performance, this paper focuses on the fuzzy logic algorithm to achieve an accurate prediction control. The Mitsubishi PLC is applied as the lower computer to fulfill real-time data collection and automation function in a greenhouse scenario. The configuration software set KingView 7.5 is employed as the upper computer to provide a friendly control interface and accomplish remote monitoring and control task, combining with the fuzzy logic algorithm, an intelligent greenhouse control system is established. Experimental results demonstrate that a better adjustable condition for crops can be achieved for the proposed greenhouse system. It also proves that the designed greenhouse intelligent control system has the characteristics of stable performance, convenience and versatility, etc., and the proposed scheme is worthwhile to be applied in the future.

11 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: Simulation and experimental results validate the design methods of a 10kW wireless charger for electric vehicle (EV) and the measured efficiency (DC-DC) is 94%.
Abstract: This paper presents the design method of a 10kW wireless charger for electric vehicle (EV). The measured efficiency (DC-DC) is 94%. The designed wireless charger includes high frequency inverter, primary compensation network and coil, secondary compensation network and coil, and high frequency rectifier. Design procedures for each stage are elaborated. Simulation and experimental results validate the design methods.

9 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: Compared with CSMO, AS MO can solve the contradiction between the SOC convergence speed and the chattering, and compared with AEKF, ASMO has the similar SOC estimation accuracy, but possesses faster convergence speed, stronger robustness and less computation time.
Abstract: On the basis of the established second order RC equivalent circuit model, a novel adaptive sliding mode observer (ASMO) is proposed to estimate the state of charge (SOC) of lithium battery in the electric vehicle The ASMO can adaptively adjust the switching gain according to the system output deviation The Lyapunov stability theory is employed to prove the convergence of ASMO Three different discharge curves are carried out, and the comparisons with conventional sliding mode observer (CSMO) and adaptive extended Kalman filter (AEKF) are also presented to evaluate the performance of ASMO The results show that: (1) compared with CSMO, ASMO can solve the contradiction between the SOC convergence speed and the chattering (2) compared with AEKF, ASMO has the similar SOC estimation accuracy, but possesses faster convergence speed, stronger robustness and less computation time

9 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this paper, the shape of the PMs for the 24/20-SPM machine with (CP) rotor is designed as eccentric shape (24/20 -ECP-SPM) and compared with the 24-20-CP-SPMs machine with tile shape permanent magnet (24 /20 -CP-SVM) for electric vehicle (EV) applications.
Abstract: The fractional slot concentrated winding permanent magnet synchronous machines (PMSM) are widely investigated in recent years. The electromagnetic performance of traditional 24-slot/20-pole surface-mounted PM machine (24/20-SPM) and 24-slot/20-pole SPM machine with consequent pole (CP) permanent magnet used for in-wheel motor drives for electric vehicle (EV) applications is quantitatively analyzed and compared by finite element analysis (FEA). The shape of the PMs for the 24/20-SPM machine with (CP) rotor is designed as eccentric shape (24/20-ECP-SPM) and compared with 24/20-CP-SPM machine with tile shape permanent magnet (24/20-CP-SPM). In addition, the electromagnetic performance which include back electromotive forces (Back-EMFs), cogging torque, average torque, torque ripple, the volume of PM, machine loss, efficiency and radial force distribution of the analyzed machines are compared and validated by FEA.

9 citations


Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this paper, a series resonant converter (SRC) is proposed to eliminate the low frequency ripple and switching controlled capacitor (SCC) is used to replace the resonant capacitor to achieve full range operation with constant switching frequency.
Abstract: High-brightness light-emitting diode (LED) is next generation of green lighting with high luminous efficiency and long life. The bulky electrolytic capacitors are required to balance the pulsating power difference, thus restricting the driver lifetime. However, the existing LED drivers using pulse frequency modulation (PFM) is bound to arouse heavy electromagnetic interference(EMI). In this paper, a series resonant converter (SRC) is proposed to eliminate the low frequency ripple. Meanwhile, the switching controlled capacitor (SCC) is used to replace the resonant capacitor to achieve full range operation with constant switching frequency. Half-bridge switches are shared by integrating the bridgeless boost power factor correction (PFC) circuit and the power control (PC), so as to realize the single-stage drive. Furthermore, the SCC is shared by the outputs of upper and lower half-bridge, which reduces the volume. All the superior performance of proposed LED driver is verified by simulation with 2-channel LEDs, rated output power of 100W.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this article, the authors provide design, discussion and analysis for the solar-powered boat development, which is a right moment to develop solar powered vessels, especially for air and oil pollutions.
Abstract: In the past decades, industries, academics and scientists put huge afford for research and development of solar-powered cars. The solar-powered vessels development has been overlooked. The pollutions due to the engine powered vessels haven't been concerned seriously. Except for the engine powered vehicles, engine powered vessels also create the environmental pollutions significantly, especially for air and oil pollutions. Nowadays, the technology for the solar-powered cars became mature. This is a right moment to develop solar-powered vessels. This paper provides design, discussion and analysis for the solar-powered boat development.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this article, the authors analyzed the losses of the hybrid energy storage system (HESS) including super-capacitor (SC) and battery in an electric vehicle (EV) based on the presented vehicular system structure.
Abstract: In this study, the losses of the hybrid energy storage system (HESS) including super-capacitor (SC) and battery in an electric vehicle (EV) are analyzed Based on the presented vehicular system structure, the simulation model is proposed With the controllable super-capacitor current, the operation of an EV with the hybrid battery-supercapacitor energy storage system is simulated under the European urban driving schedule ECE-15 and the losses of the hybrid energy system are computed and analyzed The simulated results demonstrate that the super-capacitor current can be optimized under various operating conditions to minimize the losses of the hybrid battery-supercapacitor energy storage system in the EV Thus, this study provides the valuable approach to maximize the operating efficiency of the hybrid battery-supercapacitor energy storage system in EVs

Proceedings ArticleDOI
01 Dec 2017
TL;DR: Topologies, operation characteristics and application prospects of different kinds of DC/DC converters based on MMC are summarized and the directions of future researches of MMC-DC/DC converter are pointed out.
Abstract: With the rapid development of high voltage direct current (HVDC) transmission, as a key device of HVDC grid, the development of DC/DC converter is one of the main technical issues urgently to be solved Modular multilevel converter (MMC) is characterized by flexible expansion, high quality of output voltage waveform, low switching frequency, low system loss and so on Because of these benefits, the application of MMC technology to DC/DC converter has become a hotspot in recent years This paper first introduces the topology and working principles of MMC and then summarizes topologies, operation characteristics and application prospects of different kinds of DC/DC converters based on MMC Moreover, the directions of future researches of MMC-DC/DC converter are also pointed out

Proceedings ArticleDOI
Ying Xu1, Shan Xin1, Chen Biyun1, Chi Cheng1, Zefeng Lu1, Yun Wang1 
01 Dec 2017
TL;DR: A new lane detection method combined fuzzy control with RANSAC algorithm has high robustness and effectiveness which can accurately detect the lanes in complicated city road.
Abstract: The traditional lane detection methods based on the RANSAC algorithm used to cause many false detection and unable to accurately detect the lanes in complex road environment, because of the existence of interferential noise points in the set of sampling points. Aiming at these issues, this paper presents a new lane detection method combined fuzzy control with RANSAC algorithm. The first process of the new lane detection method is pretreatment, the purpose of which is to denoise the image preliminarily through filtering and binarization. And then it selects the region of interest (ROI) that contains lanes in the input image and extract the initial boundary candidate points of the lanes in ROI. So far, there are still a lot of irrelevant noise points in the set of lane boundary candidate points. It would analyze the relationship between the interferential noise points and the boundary points of the lane, and then remove the interferential noise points from the set of lane boundary candidate points by using the fuzzy control. After that, fit the lane model by using RANSAC algorithm in the set of effective lane boundary points. The experiment shows that the method proposed in this paper has high robustness and effectiveness which can accurately detect the lanes in complicated city road.

Proceedings ArticleDOI
01 Jan 2017
TL;DR: This paper presents the government's initiatives in Europe in supporting the evolution for future transport system and suggests a way forward to address environmental challenges inherent in rapid growth.
Abstract: Digitalization, urbanization, and globalization are changing our world. They are significant drivers enabling cities to grow. We are now moving to a new era of smart cities, yet we know so little about the so-called smart city. In practice, we often hear cities label themselves as ‘smart’ as they utilize some type of information communication technology (ICT) solutions. By 2050, the population is forecast to be just under 10 billion people, with 80% of that population expected to be urbanized. Whilst there is wide agreement on exploiting technologies to improve citizen's quality of life, there are other challenges in association with urban growth, such as greenhouse gas emissions, pollution from transport, shortage of energy resources, and inadequate and deteriorating energy infrastructure. The recent announcement of no diesel car ban in cities is a way forward to address environmental challenges inherent in rapid growth. This paper presents the government's initiatives in Europe in supporting the evolution for future transport system.

Proceedings ArticleDOI
13 Dec 2017
TL;DR: The motivations for this work are presented and the design of the bikes is details, a process that has ensured maximized race performance.
Abstract: The electric superbikes recently developed at The University of Nottingham are considered to be high performance vehicles, competing with its internal combustion engine driven counterparts This paper presents the motivations for this work and details the design of the bikes which, a process that has ensured maximized race performance Extensive modelling has also given a good understanding of the system interaction Data recorded during races and on a rolling road are presented to validate the simulation work

Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this article, a switch Z-source dc-dc converter integrated with switched-inductor networks (SZSIC) is proposed for the conversion from a low voltage to a higher one in the dc link.
Abstract: This deign paper proposed few improvements on the existing electrical network in the roof-mounted solar array based electric vehicle (RSC-EV). A switched Z-source dc-dc converter integrated with switched-inductor networks (SZSIC) is proposed for the conversion from a low voltage to a higher one in the dc link. The voltage gain is increased to (1+D)/(1−7D) by replacing inductor with switched-inductor network of the frontend and adding another one switch and diode to the output terminal of the traditional Z-source dc-dc converter. Comparing the boost capabilities of existing dc-dc step-up network, higher voltage gain is realized in the proposed SZSIC. The performances of the proposed SZSIC are analyzed in this paper, and then validated by simulation results. This paper explores the idea of employing switched-inductor and switched-Z-source to design boost converter for high voltage gain DC power supplies.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: The methodology of Six-Sigma DMADV is introduced into the quality control approach, the key of which is to control the geometrical tolerances of the machine parameters as the performance of a machine is fundamentally determined by its physical geometry.
Abstract: Electric machines are the essential parts of the electric vehicle (EV) propulsion system High performance and low-cost electric machines are desirable in mass production of EVs Well-known for its economical control and global dominance of machine manufacture, China must now focus on quality control of the new generation of EV motors to prepare for the uptake of the EV market This paper proposes a quality control approach to minimize variability of EV electric machine performance The methodology of Six-Sigma DMADV is introduced into the quality control approach, the key of which is to control the geometrical tolerances of the machine parameters as the performance of a machine is fundamentally determined by its physical geometry Due to a large number of tolerances need to be considered simultaneously as they are coupled with each other, “trial and error” or “one factor at a time (OFAT)” are not applicable in the quality control study It is proposed to use design of experiment (DOE) method, which provides credible prediction and substantially reduces trial samples and computation time The DOE assisted Six Sigma DMADV method is thoroughly discussed in the paper and validated at the end by a prototype of low-cost internal permanent magnet (IPM) machine with ferrite permanent magnets

Proceedings ArticleDOI
01 Dec 2017
TL;DR: The results demonstrate 6/16 two-teeth switched reluctance topology is a potential candidate for electric vehicle applications and contains torque output, iron loss and efficiency.
Abstract: Four topologies of in-wheel motors, including three switched reluctance motors and one permanent magnet synchronous motor of the same dimension, are proposed for comparison in electric vehicle applications The three switched reluctance motors are 6/4, 6/10 and 6/16 two-teeth structures, respectively, along with the permanent magnet synchronous motor topology of 12 stator slot and 8 poles The parameters of the motors are optimized for the best torque performance through genetic algorithm The comparison contains torque output, iron loss and efficiency Consequently, the results demonstrate 6/16 two-teeth switched reluctance topology is a potential candidate for electric vehicle applications

Proceedings ArticleDOI
01 Dec 2017
TL;DR: Experimental results indicate that the dynamic error values between two motor falls into 0.17mm, and a position tracking control strategy for the two-PMLSM-based motion control system is presented.
Abstract: With the merits of a simple mechanical structure, high thrust density, quick response, permanent magnetic linear synchronous motor (PWLSM) is widely utilized in automatic processing and assembling industry On the basis of the fact that modern manufacturing usually requires multiple actuators operating together to complete some complicated tasks, this paper discusses about a position tracking control strategy for the two-PMLSM-based motion control system The system is constructed to verify the presented strategy Experimental results indicate that the dynamic error values between two motor falls into 017mm

Proceedings ArticleDOI
01 Dec 2017
TL;DR: Comprehensive simulation results show that the proposed fuzzy PI controller demonstrates significant improvements over conventional PI controllers in supporting voltage stability in V2G distribution networks.
Abstract: A new Sugeno — PI fuzzy controller exploiting the battery storage capability of the electric vehicle (EV) to improve voltage stability of a vehicle-to-grid (V2G) distribution grid is proposed. The approach employs the d-q control theory to obtain in real-time the active and reactive currents from the EV's battery during different operating conditions. To overcome the sub-optimal operation of existing methods which are based on optimization of a single operating point during steady state, the proposed method adjusts the proportional and integral coefficients of the based on the Sugeno — PI fuzzy controller during critical transients such as a load disturbance. Comprehensive simulation results show that the proposed fuzzy PI controller demonstrates significant improvements over conventional PI controllers in supporting voltage stability in V2G distribution networks.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: A pad-like flat magnetic core with high permeability was adopted and was placed under the primary side coil as well as above the secondary side coil of wireless power transfer (WPT) system as mentioned in this paper.
Abstract: A pad-like flat magnetic core with high permeability is adopted and was placed under the primary side coil as well as above the secondary side coil of wireless power transfer (WPT) system It can be as a shielding for the magnetic field Moreover, the insertion of the magnetic material increases the coupling coefficient of the two coils and thus reduces the leakage flux compared with core-less system A WPT system with nominal power of 200W was built to validate the feasibility of the proposed method Results show that after inserting the magnetic core, the power transfer efficiency is increased by about 30% with power transfer distance being 60mm–80mm

Proceedings ArticleDOI
Yang Xiaosheng1, G. Z. Cao1, Su-Dan Huang1, Chao Wu1, Hong-Jin Hu1 
01 Dec 2017
TL;DR: The sensorless initial mover position detection method with bootstrap circuit for the planar switched reluctance motor (PSRM) is proposed and the effectiveness of the proposed method is verified.
Abstract: This paper proposes a sensorless initial mover position detection method with bootstrap circuit for the planar switched reluctance motor (PSRM) The mechanical structure and mathematical model of the PSRM is first presented The sensorless initial mover position detection method is then developed based on bootstrap circuit For this method, the voltage and the peak time of voltage are measured by charging a bootstrap capacitor of each phase of the PSRM; the position range and the inductance are calculated theoretically according to the peak time; the initial position can be calculated theoretically in terms of the built inductance model and position range Furthermore, simulation is carried out base on ANSYS Maxwell Simulation results demonstrate that the relative error between the detected position and the real position is less than 3% with the proposed method; the effectiveness of the proposed method is verified

Proceedings ArticleDOI
01 Dec 2017
TL;DR: A stable adaptive controller based on the model reference control approach for high-precision positioning of the planar switched reluctance motor (PSRM), in the presence of nonlinearity and imprecise modeling of the motor.
Abstract: This paper proposes a stable adaptive controller based on the model reference control approach for high-precision positioning of the planar switched reluctance motor (PSRM), in the presence of nonlinearity and imprecise modeling of the motor The required parameters of the PSRM model are obtained using an online parameter identification method With the parameters of the PSRM model, the adjustable parameter vector of the controller is initialized in order to further enhance the performance of the PSRM system Taking the thrust force command as the control signal, the stable adaptive controller is designed based on the concept of positive realness The Simulation results on the positioning of the PSRM system demonstrate that the stable adaptive controller is capable of high-precision positioning with the desired performance The effectiveness of the stable adaptive controller for the high-precision positioning of the PSRM is verified through the research results

Proceedings ArticleDOI
Jianguo Zhu1, Gang Lei1, Youguang Guo1, Tianshi Wang1, Bo Ma1 
01 Dec 2017
TL;DR: This paper presents a method of robust design optimization for manufacturing SMC-PMSMs and drive systems of six sigma quality and design examples of a transverse flux SMC -PMSM and drive system are presented.
Abstract: The soft magnetic composite (SMC) material has attracted great research interests because of its unique feature of high speed low cost manufacturing of electrical machines of complex 3D flux topologies by the highly cost effective powder metallurgical technology. Some electrical machine manufacturers have recently started producing permanent magnet synchronous motors (PMSMs) with SMC cores. Because of the material diversity and fabrication uncertainties, an aggressively optimized design obtained by the traditional deterministic method often result in low quality product and/or high failure rates. This paper presents a method of robust design optimization for manufacturing SMC-PMSMs and drive systems of six sigma quality. Design examples of a transverse flux SMC-PMSM and drive system are presented.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: A double-input DC-DC converter for wide input Voltage range applications is proposed in this paper, which has the following advantages: the circuit is simple, the input voltage range is wide and the sources can deliver power to the load individually or simultaneously.
Abstract: The output power of most facilities for new energy power generation is unstable because of the external environment. In the distributed power system with two or more sources, a stable output can be achieved by the complementary power supply among different input sources. A double-input DC-DC converter for wide input voltage range applications is proposed in this paper, which has the following advantages: the circuit is simple, the input voltage range is wide and the sources can deliver power to the load individually or simultaneously. The operation modes and the steady-state analysis are proposed. Finally, the simulation result is proposed to verify the correctness of the analysis and feasibility of the proposed converter.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: In this paper, the authors investigated the electrical characteristics of a hybrid drain-embedded gate injection transistor (HD-GIT) based GaN power transistor with experimental study based on the gate I-V relationship.
Abstract: The hybrid drain-embedded gate injection transistor (HD-GIT) is a well-developed structure of GaN-based power transistor which solves the issues of current collapse and negative gate threshold voltage In this paper, the electrical characteristic of a HD-GIT-based GaN power transistor is investigated with experimental study Based on the gate I-V relationship, the design of the gate driver circuit is discussed The gate driving losses as well as the switching waveforms of the HD-GIT under hard-switching operations are analyzed Besides speeding up the switching operation, the reduction in the gate voltage and gate charge saves the gate driving power These features substantially increase the maximum operating frequency of the HD-GIT-based power converter The current collapse free operation allows the device working at a wide range of voltage and duty cycle without notable degradation of the dynamic on-state resistance

Proceedings ArticleDOI
W. F. Rao1, Bo Zhang1, J. F. Pan1, Xiaoyu Wu1, J. P. Yuan1, Li Qiu1 
01 Dec 2017
TL;DR: A control strategy is proposed to keep DC bus voltage stabilization, by combining supercapacitor (SC) with the wave energy generation, to guarantee the power balance under any generator power fluctuations or load changes.
Abstract: In this paper, the power balance DC microgrid system and linear permanent magnet generator (LPMG) is modeled. A control strategy is proposed to keep DC bus voltage stabilization, by combining supercapacitor (SC) with the wave energy generation. The voltage control of DC microgrid is considered as three state patterns separately, to guarantee the power balance under any generator power fluctuations or load changes. Finally, the simulation results are provided to demonstrate the feasibility of the presented control strategy.

Proceedings ArticleDOI
01 Dec 2017
TL;DR: This paper presents one type of asymmetric cascaded multilevel inverters with lower capacitor voltage ripple, capable of providing 15 levels of the output voltage, which benefits for the improvements of power quality and motor driver's performance.
Abstract: To implement cost-effective solution for EV motor driver, one type of asymmetric cascaded multilevel inverters with lower capacitor voltage ripple is presented in this paper. The proposed multilevel inverters own simple structure. Only one switched capacitor and two DC sources are required for single phase configuration. With proper modulation strategy, the proposed inverter is capable of providing 15 levels of the output voltage, which benefits for the improvements of power quality and motor driver's performance. Circuit configuration, operation principle and capacitor voltage ripple are theoretically analyzed in detail. Simulation results are provided to verify the feasibility of the proposed inverters.