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Electric vehicles (EV) offer promise as an effective solution to environmental problems. One of the keys to their successful diffusion is the provision of adequate battery charging infrastructure. In order to create a charging infrastructure by installing equipment in such as locations as carports in private homes, the wireless battery charging system is very suitable. EVs can be used in smart house...
To promote the wide acceptance of electric vehicles (EVs), the charging facilities should satisfy with some basic requirements, such as high efficiency, low harmonic pollution, long lifetime, low cost, and ease of bulk construction. Therefore, a novel EV charging facility — dc charging spot and a lower stress zero current switch-pulse width modulation (ZCS-PWM) Superbuck converter suitable for output...
The principle of switched reluctance generator (SRG) is introduced. And the compositions of switched reluctance generator system are given. Two main circuit structures of SRG system are compared to select the better one, i.e., self-excitation pattern and separate pattern. The control strategy of SRG system is put forward. Fixed angle PWM duty cycle control is used at low and medium speed. Fixed PWM...
AC motor-driven electric scooter in addition to mini-EV which are highly eco-efficient, high performance, more convenient, and air-pollution free are to offer a certain powerful solution to global environmental problem. This paper presents a newly-developed super-quick charging power electric motor-driven scooter (Electric Scooter) incorporating EDLC stack useful for a low carbon society. Described...
There are lots of issues existed with the Power Supply System in DC Building, and it is controversial as these issues have not been solved completely. In recent years, worldwide attention has been focused on proposing the standards of “HVDC power supply system” or “up to 400Vdc power feed system” following with the development of the power supply system in data center. Many attentions from the worldwide...
This paper proposes a single-magnetic cell-to-cell battery equalization topology. This balancing method achieves energy transportation by fly-back operation and forward operation. Energy transfers directly from the highest voltage cell to the lowest voltage cell which is conductive to improving the balancing efficiency and speed. To confirm the performance of the proposed battery equalizer, stimulations...
Quasi-Z-source inverter (QZSI) can boost and buck the input voltage with only once power transformation. It is suitable for the grid-connected photovoltaic (PV) system with the wide variation of PV cells output. The composite control for PV grid-connected and energy-storage based on Quasi-Z-source inverter is researched in this paper. The energy balance between the pre-stage circuit and the post-stage...
Because of high cost of battery, BESS is not suitable for the situation when the demand of active power is less than that of reactive power. A novel STATCOM based on the hybrid cascaded multilevel converter is proposed to provide limited active power support. Meanwhile, this topology doesn't have the drawback of cascaded H-bridge BESS. The characteristic of output power for this topology is studied...
Li-Ion Battery (LB) stack with bi-directional DC-DC converter is used as an energy storage module in Super Uninterrupted Power Supply (UPS). In this paper, the operating mode of the LB module with bi-directional converter is analyzed. The control scheme of the bi-directional DC-DC converter for LB Stack is introduced. A power management strategy for the LB module in super UPS is investigated. The...
This paper addresses a dual active bridge isolated DC-DC convertor into a cascaded battery energy storage system(BESS) with an additional benefit of medium frequency galvanic isolation. The topology, named as multi-level cascaded medium frequency isolated cascaded power conversion system is presented in the beginning of this paper to improve the performance of cascaded BESS. Its working principles,...
A common DC bus connected PV-battery system is introduced, in which two asymmetry PV boost converters can work respectively or together, the T-type three-level DC/AC converter could operate in four-quadrant, the battery exchange power with the common DC bus via a bi-directional DC/DC converter (BDC), and some more peripheral equipments are introduced to make up the whole system. The overall control...
A novel high step-up three-port converter is proposed in this paper. By utilizing coupled-inductor technique, voltage lift technique and multi-winding technique of coupled-inductor. However, main switch suffer from high voltage spike during the turned-off period. Hence, for suppressing and recycling the energy, the clamp circuit technique is applied. Finally, the prototype of the proposed converter...
In order to deal with frequency restoration and protect the energy storage units, this paper analyses the control method of microgrid based on hierarchical control, and proposes an innovative secondary frequency control method which optimize the output of energy storage units in island mode. The simulation results show that the algorithm can make microgrid provide high stability and power quality...
Topology and power sharing strategy are two important issues of hybrid energy storage research. In this paper, a novel hybrid power storage topology based on modular multilevel converter is proposed. And a specially designed PWM method is used to realize active voltage balance. Based on the topology, a novel power sharing strategy based on fuzzy logic controller is proposed. Compared to other two...
This paper presents a novel cell voltage equalization system, which employs cell management modules that can be attached with individual cells in a battery bank. A unique resonant bi-directional DC-DC converter topology is employed to facilitate bi-directional energy transfer between cells and the battery bank. A mathematical analysis of the bi-directional resonant DC-DC converter system is presented...
Based on the equivalent circuit model (ECM) of lithium-ion battery, this paper introduces an autoregressive and moving average with exogenous input (ARMAX) model. A recursive extended least square algorithm with forgetting factor is employed as the model parameter identification method, because there is a colored noise in operating process. Then HPPC test was conducted on a 20Ah LiFePO4 cell and the...
Series-connected lithium batteries can be charged in pack mode that is most widely used in lithium battery application field. But pack charging mode will lead to cell unbalanced charging because of cell differences among series-connected batteries in electrochemical characteristic. On the other hand, the cell charging mode can avoid the imbalance problem by charging each cell independently as a result...
This paper present a study of the isolated DC/DC stage of Bi-directional on-board battery charger module (OBCM) for electric vehicle (EV) and plug-in hybrid electric vehicle (PHEV) application. The modulated dual active bridge (DAB) converter and boost series resonant converter were thoroughly analyzed for this application. The ZVS boundary conditions, power stage optimization compatible to wide output...
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