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Lithium iron phosphate batteries (LiFePO4) are becoming one of the main power resources for electric vehicles (EVs), and the non-uniformity of cells in a battery pack has become the bottleneck to improve battery usable capacity. Many active balancing approaches are proposed to transfer charge among the cells to achieve the uniformity based on terminal voltage. This paper proposes a new balancing approach...
This paper presents performance evaluation as grid connected induction generator (IG) system has attracted great interest in DC-Link using battery and photovoltaic (PV) panel. In the single-phase utility grid connect power maximum from three-phases operating on single-phase induction generator there is the necessity. System can meet the requirement for constant DC-Link voltage of the wind turbine...
This paper proposes a new and simple while cost-effective method for light electric vehicles regenerative brake with BLDC motor (Brushless DC Motor). The power stage topology of this electric vehicles' motor controller is similar to traditional BLDC motor controller. There is not necessary to use additional power converter, such as a boost converter, or other electric energy storage system for regenerative...
In this paper, a cell to cell voltage balancing for battery systems is proposed. Batteries of series-connected are widely used in various applications. Differences always exist between different batteries, therefore, a charge equalizer is necessary for the energy system consisting of many batteries either in series or in parallel. A battery management system is usually used to increase the life cycle...
In the electric vehicle(EV) system, the Technology for the efficient operation of a battery is one of the most important technologies. By the voltage difference between the cell and between modules of electric car battery, it will not be able to efficiently use the battery. Using the voltage balancing method to each of the battery modules to increase the available space for the battery module, it...
Recently the technology of WPT (Wireless Power Transfer) has received much attention on the new charging way of electric vehicle (EV). In the combination of the WPT and EV application, one of the key points is to keep the whole system operating under the high efficiency conditions. Considering the request of battery priority, this paper proposes a strategy of the maximum efficiency point tracking...
Among researches in the use renewable energy resources, the study is actively in progress about micro-grid system applied DC distribution. Wind and photovoltaic (PV) sources which used at micro-grid as distributed power have flexible generation. When comparing with flexible generation curve and demand load curve, the produced power of micro-grid has deficient or excess case. So, Only pure generation...
Series hybrid Unmanned aerial vehicle(UAV) that is proposed in this paper performs Vertical take-off and landing(VTOL) using the battery and generator, and it applies the series hybrid system with combination of the small engine and generator when cruising flight. This system can be described as the next-generation system that can dramatically increase the UAV flight times. Also, UAV systems require...
Recently, the mass production of Energy storage system (ESS) is actively perform around world. Energy storage system is a technique that stores power to energy storage device to supply energy into grid and load at peak-load. Therefore, the efficient energy management is available by using ESS system. The life of Lithium-ion battery is varied corresponding to the power usage, especially selected depth...
This paper address compensation performance for the previously proposed smart charger of Electric Vehicles (EVs) with constant dc-capacitor voltage control under multiple household customers. No calculation blocks of the reactive and unbalanced active components on the load side are used in the previously proposed control strategy. The smart charger with the constant dc-capacitor voltage control based...
This paper deal with a proposed PM motor driving system consist of PWM inverter with voltage booster to apply to wireless power transfer system for automated guided vehicle (AGV). This system would provide advantage that it makes to drive a PM motor and charge a battery at high efficiency against conventional system using low voltage battery because DC link voltage controlled by voltage booster at...
Ramp rate consideration of a BESS using active power control for PV generation is proposed in this paper. Battery energy storage system (BESS) in ac microgrid is used in this research. The design of controller is verified by PSIM 9.0 under unstable of solar energy each day. This paper presents the output power control of PV generation by using BESS, which help to compensate active power to fulfill...
This paper presents a battery charge equalizer based on a Class-E inverter with a voltage balancing mechanism between odd and even batteries, where all of the batteries are marked with odd or even numbers. The control strategy is simple and no voltage sensors are required. High efficiency can be achieved due to zero voltage switching. In addition, the voltage differences between odd and even batteries...
At present, the battery management system (BMS) of lots of electric vehicles (EV) with different types cannot communicate normally with AC charging piles in residential quarter. The paper proposed a coordinated charging strategy for EV aggregator in residential quarter without collecting the state of charge (SOC) of EVs. The method obtains the constant charging time of EVs by certainty analysis, then...
An electric vehicle (EV) quick charger based on CHAdeMO standard with grid-support function is proposed in this paper. The current source modular converter configuration is used to perform the charging pulses with both positive and negative pulse to achieve required time for an EV which is less than 30 minutes. The use of current source converter can offer the inherit fault tolerance capability and...
This paper proposed a modular battery equalizer, which is easy to be expanded and based on the zero-voltage-switching converters that are introduced to reduce the switching loss. The voltage of each battery can be maintained with the equalizer. The working scheme is established and the control diagram is presented. Experimental results validate the topology and the proposed control algorithm.
This paper proposes the modular low voltage DC/DC converters (MLDCs) in order to achieve state-of-charge (SOC) balancing of modularized batteries without additional balancing circuits. The MLDCs are substituted with the low voltage converter for EV, PHEV, and HEV located between the high-voltage side battery and low side battery. The MLDCs are composed of a number of modularized buck-converters and...
This paper proposes a phase current compensation method for a 3-Level NPC Dual Battery Pack charge/ discharge system. In this system, a DC link imbalance could cause distortion in the space vector diagram, which would cause distortion in the NPC phase current. The proposed compensation method eliminates this distortion. In this paper, the compensation method is proposed and verified by simulation.
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