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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...
Modular multilevel converter (MMC) is a recently emerged multilevel topology for high-voltage high-power applications. However, in wind power application the performance of the MMC has not been deeply investigated. In this paper the application of MMC in wind energy systems is studied. The converters used to connect the wind turbine to the grid having the rated active powers of 2MW and 10MW are designed...
In order to protect the converter of doubly fed induction generator(DFIG) and realize low voltage ride through(LVRT) during grid faults, the crowbar is usually used , since the resistor value of the crowbar effects DFIG's rotor current, reactive power output and electrical torque, it 's design is very crucial for LVRT.A novel optimal design of DFIG crowbar resistor for fault ride-through is proposed...
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 proposes fast initial position estimation of IPMSMs (Interior Permanent Magnet Synchronous Motors), which is based on intentional pulse voltage injection and comb filters. Most initial position estimation methods utilize the amplitude or differential values of high-frequency currents and the performance of sensorless control depends on the algorithm to reconstruct these values. Although...
The efficiency of a contactless power transformer is determined by the output load. We propose a high-efficiency contactless power transfer system for a low-voltage and large-current load. The proposed system is composed of a contactless power transfer system with series and series resonant capacitors and a current-doubler rectifier circuit. This paper presents the characteristic of the proposed system...
In order to face the coming era of DC power supplying, it is needed to establish the technology of high step-down converter for the electrical appliances' control circuits, especially for dynamic appliances like air conditioner, refrigerator and freezer. For a forward converter suitable for high step-down[1]∼[2], mathematical derivations, including steady-state analysis in time domain and static characteristic...
Three different energy storage systems by use of power electronics technologies are presented. These systems were applied to demonstrative microgrid projects which have concepts different one another. Concepts of the projects, requirements on energy storage systems and demonstration results are introduced.
The wide band gap nature of SiC semiconductor makes high voltage power device possible to operate at high temperature. The high temperature operation of power device is expected to realize simplification of cooling system and miniaturizing the system size with smaller heat sink and/or less liquid cooling system. However, conventional plastic packaging for Si power device is designed to operate lower...
Cooperative Study Group on Standard Model Development for Power Electronics Simulations, created under the Industry Applications Society of the IEEJ (Institute of Electrical Engineers of Japan), is active to develop standard models for simulations related to power electronics. Under the study group, four working groups (WGs) have been created for different fields of simulation. Among them, Smart Grid...
In this study, integrated H-bridge converter with the Matrix-POL power supply system is proposed. From the simulation results, the validity of the Matrix-POL is revealed. The results revealed that the fast response to the load current and the voltage change can be done with duty and parallel number control by the proposed system.
Recently, the power supply network with energy storage devices such as battery has been focused. This network topology uses bi-directional isolated DC-DC converter of low or medium capacity is required for the diversification of power supply network. The dual active bridge (DAB) DC-DC converter is one of the effective bi-directional isolated DC-DC converters. However, the circuit has some instinct...
This paper shows the transient behavior of a system which boosts a part of the battery voltage for a electric vehicle. This system consists of the powertrain of electric vehicles and a bi-directional isolated DC-DC converter called dual active bridge (DAB). This system can compensate the battery voltage drops with high efficiency compared with the conventional series chopper system. In many studies,...
This paper proposes a state-of-charge (SOC) estimation algorithm for a series-connected Li-ion battery pack using a reconstructed open-circuit-voltage (OCV) curve. This method redefines the OCV-SOC relationship based on a cell which has the lowest available capacity and estimates the battery pack SOC and capacity information regardless of the type and existence of balancing circuit. To validate the...
A three-phase isolated full-bridge boost power factor correction (PFC) converter with a flyback passive auxiliary converter is presented and investigated. The PFC converter operates in discontinuous conduction mode (DCM), it can achieve zero voltage turning off for the upper switches and zero voltage turning on for the lower switches. With the adoption of the passive auxiliary converter, the voltage...
This paper proposes a novel single-phase seven-level inverter. The topology of the proposed structure is composed of a DC source, a switched-capacitor circuit, and a coupled inductor. Compared to conventional seven-level inverter structure, numbers of switches and capacitors are reduced. The voltages of capacitors are self-balanced by using coupled inductor without complex control method. Therefore,...
This paper describe a design method of an LCL filter for the three-phase two-level voltage-source PWM converters. The grid current harmonics regulation is the primary condition for the operation of the grid-connected converters to satisfy. If the grid voltage is assumed to be ideally sinusoidal, PWM switching is the only factor to produce harmonics on the grid current, especially around the bands...
An interleaved Buck PFC with digital and clamping current control is proposed in this paper. Inductor current can be operated in CCM or DCM, which depends on different input line voltages and load conditions. The interleaved topology is composed of two Buck converters, which can have higher power density, lower input and output ripple currents and improve input current harmonics. Microprocessor TMS320X228035...
The demand for noise reduction inside a vehicle has been recently increasing in the pursuit of improved ride comfort. In consideration of requirement of quietness improvement and reduction of weight, an active noise control (ANC) system has been attracting much attention. This method is effective for noise with low frequency. In this study, we propose an ANC system by using the vibration of giant...
A new two-phase mathematical model of Linear Induction Motor (LIM) is discussed. This model is simpler than conventional model, but can correctly calculate both asymmetric primary current and thrust ripple performances. In addition, an improved DC testing method is proposed to determine all circuit parameters in the model. This test is completed by only one simple standstill test. Hence, both no-load...
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