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In this paper, a novel switched-capacitor charge-equalization circuit is proposed. Electric charge is transferred to a capacitor from two series-connected cells; whereas charge is returned back one of the cells by the charged capacitor. In this way, a larger equalization current can be achieved, and therefore effectively shorten the equalization time. In order to enhance the energy efficiency, voltage-sensing...
This paper presents the efficient limit setting for state of charge (SOC) to match with respect to the solar irradiance, load condition while special consideration based on analyzing the number of operational hours of diesel generator and lifetime of the battery. The hybrid PV/diesel standalone system is located in Ranau, Sabah, Malaysia.
This paper proposes a general framework to design operation modes of decentralized controlled DC microgrids without communication links. Under this framework, power units of the DC microgrid are firstly classified into several types according to their physical features. Then, a utilization priority of different types of units is determined by certain economic index, in order to achieve good economic...
In this report, energy saving characteristics of a main circuit system having the inverter which applied SiC elements and Motor whose v/f is reduced were reported. As a main circuit system, an effective way of energy saving was examined, and evaluated. It was also put on the experimental vehicle, E995, and the electricity reduction effect against the existing system was evaluated.
FCEV (Fuel cell electric vehicle) is provided with energy for operating the motor from the fuel cell. But fuel cell is impossible to be charged at the regenerative mode and also, it has slow dynamic characteristics. So, additional battery is essential as an auxiliary power source in FCEV system. The output current of the VSI (Voltage Source Inverter) is distorted due to the dead-time and the delay...
Authors proposed the series chopper based power train aimed for the extension of the driving range. In previous paper [1], under the condition of the constant DC-supply voltage, effectiveness of the optimization of the profile of the chopper output voltage was shown. However, the output voltage of the battery used in the actual EV varies depending on the state of charge (SOC). Because of this difference,...
This paper presents the student's manufacture activity of a racing Electric Vehicle (EV) which is a very small size and single rider type for participate ECO-RUN Race in Sugo Japan. The racing EV requires a light body weight, small wind resistance, high electric energy efficient, etc. to achieve a good score in the ECO-RUN racing tournament in Sugo. Not only power electronics but also mechanical design...
A new control approach for bidirectional DC-DC (BDC) converter is proposed in this paper. This approach aims at controlling a BDC in such a way that makes it behaves like a multi-level virtual conductor. As a matter of fact, the voltage difference between the terminals of any conductor is zero volts. Conversely, the main target of the proposed control approach is to keep the voltage difference between...
Technology development has been promoted aiming for an environment-friendly traction power supply system for railways. Among other things, a stationary energy storage system using lithium ion batteries for hybrid cars has been put into practical use since 2007. This device temporarily stores regenerative power generated from an train when it is stopped and the power is able to be applied for energy...
Energy storage will gain importance in the future power system due to increased amount of renewables. In this paper, a utility scale Battery Energy Storage System (BESS) for megawatt utilizing a high voltage and a high power Voltage Source Converter (VSC) is proposed to be able to inject/consume the required power and energy to the grid. The batteries are both series and parallel connected on the...
Different converters such as the traction inverter and DC/DC converter are connected to the dc bus of an electric or hybrid electric vehicle. Harmonic models of these devices towards the dc bus are needed to investigate different phenomena like the dc bus transients and ripples. A high-frequency harmonic model of a traction circuit, a drive system based on a three-phase inverter connected to an ac...
In AC/DC converters for on-board chargers, the DC-link capacitor on the output side in a power factor correction (PFC) converter uses aluminum electrolytic capacitors in order to obtain a large capacitance with low voltage ripple and small size. Therefore, it is necessary to reduce the capacitance when using film capacitors without increasing the size of the converter in order to realize a capacitor...
A two-switch voltage equalizer using a half-bridge converter with multi-stacked current doublers (MSCDs) is proposed for series-connected batteries in this paper, for which only two switches are required, regardless of the number of batteries connected in series. The proposed equalizer is also capable of relatively large equalization currents without increasing ripple current thanks to the interleaved...
The operation of a battery power bank with the buck-boost type battery power modules (BPMs) is studied. All BPMs in the power bank are collaboratively to cope with the load requirements but substantially are operated individually. They can be scheduled to discharge currents from batteries in accordance with their state-of-charges (SOCs) and the operating modes of the converters. The operations of...
A series of challenges have been put forward for safe operation and stable control of the power grid with integration of renewable energy, such as wind, photovoltaic, etc., and also novel loads such as electric vehicles. It stimulates the technology development of smart grid. This paper introduces a demonstration project of an island smart grid in China. The renewable energy resources on this island...
Recently, the capacity of renewable power sources installed in small remote islands, whose power grid is isolated from large scale grid, increases because of the environmental affairs and the generation cost and so on. But in the small remote island grid, the power fluctuation caused by renewable power sources affects power grid stability and operation. In this paper, several stabilizing methods based...
For the sustainable development of our highly electrified societies, power electronics technology is playing an important role. Especially in the field of electric power systems, it is considered as one of the essential technologies which make power grids more efficient, more reliable and more environment-friendly. Those are the goals of so-called smart grids. In this paper, expected roles and applications...
This paper describes expected effects and characteristics required for next-generation power devices to be used in home appliances and consumer electronics. This paper focuses on the challenges presented by the IH cooking heater, energy storage systems, and solar power generation system and presents the circuits that will solve these challenges. Also, requirements for power devices used for the circuits...
East Japan Railway Company (JR East) has developed the catenary and storage battery hybrid train system using a test car for the purpose of through operation service between electrified section and non-electrified section and decreasing environmental impact of diesel trains operating. We will develop commercial train Series EV-E301 applied this hybrid system and start operation in March of 2014. We...
Frequency controlled Inductive Power Transfer (IPT) systems for Electric Vehicle (EV) battery charging applications often suffer from high power losses in partial-load, because the transmitter coil current is not significantly reduced at low output power. Therefore, in this paper a novel control method is presented that exhibits a substantially higher partial-load efficiency, while it also enables...
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