International Review of Electrical Engineering (IREE)

A novel scanning bat algorithm strategy for maximum power point tracker of partially shaded photovoltaic energy systems

Review on non-isolated multi-input step-up converters for grid-independent hybrid electric vehicles

Improved droop control strategy for parallel connected power electronic converter based distributed generation sources in an Islanded Microgrid

In order to improve system reliability and reduce device thermal fatigue failure in multiload wireless power transfer (WPT) systems for electric vehicles, the implementation of the junction temperature fluctuation suppression strategy for SiC MOSFETs is necessary However, current methods are relatively lacking, and active thermal management has not been used in WPT systems In this article, the relationship between circuit parameters and junction temperature of SiC MOSFET is analyzed In particular, a junction temperature fluctuation tracking suppression strategy for SiC MOSFETs is proposed, which consists of a coarse and a fine adjustment stage As for the former, a shunt capacitor bank switching method is implemented In order to compensate for the coarse adjustment defects in the small adjustment range and poor effect, in fine adjustment stage, a changing driving voltage method is used Finally, a 5-kW multiload WPT system is built for verification Experimental results show that the proposed strategy has obvious effect on the suppression of junction temperature fluctuation and keeps temperature near the target temperature Benefiting from this, the maximum 139 °C junction temperature fluctuation is completely eliminated when the power fluctuations are within 361% of the rated power, and the heat load of each SiC MOSFET can be independently adjusted

Analysis, Design, and Implementation of Junction Temperature Fluctuation Tracking Suppression Strategy for SiC MOSFETs in Wireless High-Power Transfer

This paper presents a modeling and simulation of two different vehicles topologies (parallel hybrid electric vehicle and series hybrid electric vehicle) using the ADVISOR (ADvanced Vehicle SimulatOR). An accurate analysis of the performance of a hybrid electric vehicle, as well as of its consumption and pollution level, requires a dynamic analysis of its behavior. Two kinds of simulation tools for electric and hybrid electric vehicles exist: steady state and dynamic tools. An accurate analysis of the vehicle performance requires a dynamic model that includes many components such as its electric motor, its batteries and its motor controller. The central controller of this sedan consists of I/O Board, Adapter and Microcontroller of motor drive. In a first step, the vehicle components are sized, using a power flow analysis, to meet the requirements of energy and power of a typical “Sedan vehicle”. In a second step, simulation results are presented and discussed to analysis complexity and performance.

Analysis and simulation of hybrid electric vehicles for sedan vehicle

Inverter systems that feed electrical power from photovoltaic (PV) system into the grid must convert the direct current of the PV array into the alternating current of the grid. In many applications, it is important for a converter to be lightweight, highly reliable, input/output isolated, flexible and operable in a boost mode. These features can be achieved by using a High-Frequency inverter which involves an isolated DC-DC stage and DC-AC section, which provides AC output. This paper proposes a new three phase topology, based on multi stage converter and PV system in order to use in medium and high power applications. The Perturb and Observe (P&O) method is used for maximum power point tracking (MPPT) control of PV array. The switching control signals for three-phase inverter are provided by hysteresis control method. Also, the comparison between the proposed topology and traditional structures has been conducted and finally the simulation researches are performed in a closed-loop control system by MATLAB/Simulink software to verify the operation of the proposed structure. The results represent better performance of the introduced system over traditional topologies.

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Three-Phase Multistage System (DC-AC-DC-AC) for Connecting Solar Cells to the Grid

This study deals with a power factor correction (PFC) based Vienna converter for Switched Reluctance Motor (SRM) drive for medium power applications. Compared with the traditional two-level or three-level unidirectional rectifier, Vienna rectifier is the appropriate choice for its advantage such as only half numbers of the switches, simple structure, high-power efficiency and ability to realize unity power factor with proper control strategy. The PFC-based Vienna converter is designed to operate in continuous inductor current mode and feed two SRM drives from one power supply simultaneously. The proposed drive is designed to operate over a wide range of speed control with improved power quality at ac mains. The performance of the proposed drive is compared with Diode Bridge Rectifier (DBR) and it is validated with simulation results. Simulation of the proposed system for feeding SRM has been done in MATLAB software. The proposed topology provides almost lower input current THD, which is found to be about 0.25% and improved power factor up to 1.

Application of Vienna Converter to a double-driven SRMs under one PFC compensator

In this paper, a new variable switching frequency algorithm is proposed in which the switching frequency is varied in response to the variation in the operating conditions. The proposed algorithm is based on online junction temperature estimation. The proposed estimation model is based on Foster-type and power loss calculations for PWM IGBT inverter system. The proposed variable switching frequency algorithm can decrease power losses and so increase the efficiency of the inverter without deteriorating the harmonic performance Moreover, the lifetime of the inverter can be increased due to the narrower junction temperature profile that can be achieved by this algorithm when compared to the fixed switching frequency counterpart.

Lifetime extension by varying switching frequency of inverters based on junction temperature estimation

In this paper, design and simulation of two different hybrid electric vehicle topologies (Parallel HEV and Series HEV) is proposed. Also, a comparison between parallel and series design for hybrid electric vehicles is studied. Each of the topologies has many parameters that calculated at optimal operation point. Design main parts are comprises select of electric motor, design of controller and calculation of battery capacity. After the calculation parameter above, these values are applied to ADVISOR (ADvanced VehIcle SimulatOR). In different cycles, the outputs of the two topologies are compared each other and the results are presented in each section. Finally, according to these results the proper structure for sedan vehicle is chosen.

Araz Saleki

Papers

Analysis and simulation of hybrid electric vehicles for sedan vehicle

Three-Phase Multistage System (DC-AC-DC-AC) for Connecting Solar Cells to the Grid

Application of Vienna Converter to a double-driven SRMs under one PFC compensator

Lifetime extension by varying switching frequency of inverters based on junction temperature estimation

Investigation and comparison between PHEV and SHEV for sedan vehicle based on ADVISOR