The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An asymmetric three-level neutral point diode clamped converter for switched reluctance motor drives is proposed in this paper. The modulation method, DC-link voltage balancing algorithm, and current control scheme of this converter are presented. The proposed three-level converter is compared to the conventional asymmetric half bridge converter in terms of current ripple, cost, and power loss. The...
Stability of onboard dc power systems is influenced by nonlinear behavior of converter-controlled loads with constant power characteristics. This nonlinear dynamics, in line with reduced size input filters used in transportation systems, has a degradation effect on the dynamic performance and stability of the system. This paper addresses stability study of a dc power system with an active stabilization...
The Power management strategy of HEV using global optimization techniques can achieve optimum control solution. However, the “a priori” nature of the trip information and heavy computational cost prohibit it from being utilized in real world application. In this paper, a power management strategy using particle swarm optimization (PSO) is proposed. The aim is to achieve real time implementation and...
In this paper, CLL and LLC resonant converter topologies are investigated for multi-phase applications that can be used for electric vehicle (EV) chargers. The comparison is realized designing two different resonant converter topologies, multi-phase CLL and multi-phase LLC resonant converters. The designed converters are compared with their performances and topology features. One advantage of CLL...
For stability analysis, it is often chosen to model power loads by constant power loads (CPL). However, this model may be too strict, as it is the worst case scenario. In this paper, it is intended to change the model of a power load to increase the calculated stability zone of a DC system composed of a source converter, an LC filter and the power load. A stabilization term is included in the command...
This paper presents a low cost multilevel modular switched capacitor dc-dc converter for high power and high voltage conversion ratio application with reduced device count. The switching devices number of the traditional multilevel modular switched capacitor dc-dc converter is increasing fast with the increase of conversion ratio. Large number of switching devices means more gate drive circuit, more...
Electric Vehicle (EV) sales continue to increase, making a preexisting need for updating current infrastructure even more important. Public charging, in particular, fast DC charging technologies can cause stress to the grid, including voltage deviations and increased loading, leading to issues including a degradation of power quality, power equipment loss of life, and brownouts. Literature has shown...
Three models are implemented to study the behavior of DC current-carrying wires under steady (continuous) and transient (peak) conditions. Each model uses an energy balance. The steady state model provides the initial temperature for the transient models. I2t curves are developed with the transient models to guide and simplify the wire sizing process for peak current in design of DC electric traction...
Induction motor drives are conventionally operated with a fixed inverter dc-link bus voltage. However, low drive speeds will result in low modulation index and poor dc bus utilization of the inverter. Aperiodic current controllers, such as hysteresis controllers, exhibit increased switching frequencies and losses for higher dc-link voltages. These high switching frequencies can be avoided by dynamically...
The advances in power electronics devices have opened the possibility of counting on Synchronous Reluctance Motors (SynRM) where variation of speed is required. However, Induction Motors (IM) have successfully supplied this demand in industrial applications. As for traction applications, SynRM aided by Permanent Magnet is also an alternative to Interior Permanent Magnet Motors (IPM). In this study,...
In this paper, a state of charge (SoC) and state of health (SoH) estimator is presented for lead-acid batteries. The estimation strategy is based on adaptive control theory for online parameters identification. To speed up the estimator's convergence, the adaptation law is replaced by a genetic algorithm (GA). Therefore, robustness to parameters variation is also achieved and thus, accurate prediction...
In this paper, a battery swapping station (BSS) model is proposed as an economic and convenient way to provide energy for the batteries of the electric vehicles (EVs). This method would overcome some drawbacks to the use of electric vehicles like long charging time and insufficient running distance. On the economic concern of a battery swapping station, the station would optimize the availability...
The goal of this paper is to analyze the performance of regenerative energy storage systems (ESS) in electric vehicles. This article presents a comparison of two different hybrid ESSs and using the Li-ion based conventional battery packs. The hybrid ESSs considered in this study combine Li-ion cells with ultra capacitors and hydraulic systems respectively. The configuration of each of these combinations...
This paper evaluates thermal losses and thermal energy transfer in the powertrain components of an electric city bus. A simulation model of an electric city bus was developed in AMESim simulation software. Simulations were carried out in four different driving cycles and in different ambient temperatures. The simulation results show that there is a strong correlation between thermal losses of the...
Driving is full of unpredictability and uncertainty. Standardized drive cycles, traditionally defined as velocity-time profiles serve as test-beds for performance prediction. However, these generalized patterns do not offer real-life testing scenarios for every trip a vehicle might encounter during its life-cycle. Thus, the “Journey Mapping” concept is highlighted in this paper, which re-defines drive...
In this paper, the optimization problem for switched reluctance motor (SRM) is discussed and the convex optimization method is applied to calculate SRM control parameters instead of parameter sweeping. An optimal approach to calculate the maximum torque at each speed is presented. Also, a method to optimize control parameters is presented to minimize the copper loss for the given speed and torque...
Addressing the problem of high energy consumption from national grid of electrically assisted rickshaw the Control and Applications Research Centre (CARC), BRAC University has proposed a field tested green solution: provide a share of the required energy of these rickshaws using solar energy. A 360Wp PV array was installed on a rickshaw and the performance was evaluated to determine its impact on...
A novel multi-level phase-controlled resonant inverter is presented in this paper. The inverter is intended for wireless energy transfer systems. The proposed converter topology is obtained with two identical multi-level dc-ac inverters, connected in parallel through two common-mode capacitors. To overcome high voltage and current stresses across the switches, the proposed topology splits the voltage...
An adaptive fuzzy logic control (FLC) scheme is presented for permanent magnet synchronous machines (PMSMs) as an alternative to conventional control techniques. Unlike other controllers, the proposed strategy achieves speed tracking without any current loop regulation, which yields reduced complexity. However, the absence of current control leads to higher energy consumption and limits the operation...
This paper presents a new topology of an isolated multilevel inverter that can be used for high voltage and high power applications such as integrating battery storage systems and alternative energy sources to power grid. With reduced number of components the proposed cascaded multilevel inverter requires only one dc source by cascading high frequency transformers. The core building blocks in the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.