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Conventional dual half-bridge converter has been previously shown to have advantages in low voltage and high current input applications. This characteristic is suited to photovoltaic application or battery application likes energy storage system (ESS) or uninterruptible power supply (UPS). However, conventional dual half-bridge converter cannot charge the battery because the power flow is one-way...
This paper describes steady state characteristics of the boost-type matrix converter for three-phase four wire system. The converter is intended for use in a stand-alone power source with constant voltage and frequency. The conventional method however is not able to control the output-voltage in the case of low power factor load. To solve the problem, we propose a new control method of the matrix...
This paper describes a high-speed circuit to protect IGBTs against short-circuit faults. The reverse transfer capacitance depends on a collector-emitter voltage and it produces a significant effect on a switching behavior under short-circuit fault conditions as well as under normal conditions. A gate charge characteristic under short-circuit fault conditions differs from that under normal turn-on...
It presents a hybrid battery charging system unifying an on-board charger (OBC) with a low voltage dc-to-dc converter (LDC) for small and light design of EV charger. The proposed hybrid charger consists of three H-bridge converters including a selective switch, a high frequency transformer, and inductors. Front-end converter connected to the grid by a selective switch has two roles. One is to obtain...
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 modular multilevel cascade inverter based on double-star chopper cells (MMCI-DSCC) has been expected as one of the next-generation multilevel PWM inverters for medium-voltage high-power motor drives. This inverter consists of cascaded bidirectional chopper cells with dc capacitors. One of concerns for the motor drive is how to achieve stable operation in a low-speed range. Some kind of solution...
Recent years, to replace current source control methods, voltage source control methods such as virtual synchronous generator (VSG) and droop control have been proposed for grid-connected and/or stand-alone inverters. Both methods imitate the behaviors of synchronous generator. With the presence of swing equation, VSG has a virtual inertia, while droop control does not, and the rest of the two control...
Metallic communication lines in wire communication systems are usually used as power lines. Ac communication signal and dc supply power are separated at input part of a powered terminal. Conventional well-known separators utilize the combination of inductors and capacitors. When the signal frequency is low, volume of these components increases. A conventional electronic choke circuit using transistors...
Detailed analysis and the parameter design of damped LCL filters applied in three phase voltage source converters is carried out in this work. Relations between the LCL filter parameters (L1, L2, C and R) and the corresponding transfer function parameters, including ωs, ωc, ωz and ωR, are investigated mathematically and demonstrated explicitly. Based on this methodology, a reasonable and optimal design...
This paper presents efficiency improvement of switched reluctance motors (SRMs) by stepped-skewing rotor (SSR). The cross sectional configuration of the SRM tested including size and shape of salient poles is almost same as those of a conventional SRM. The tested SRM is divided into 3 stacks, and only rotor is skewed. The skew angle has been designed to reduce both of torque ripple and radial force...
This paper presents a multi-stage Switched Reluctance (SR) motor. In this proposed machine, the numbers of stator and rotor poles are equal in each stage. Because of the structure the proposed SR motor can achieve high torque/current ratio in operation. Also, the low-vibration operation is possible by shifting the excitation firing angle. Effectiveness of the proposed SR motor is verified by performing...
This paper describes a high-speed switching method of MOSFETs applied to a chopper and a half bridge inverter. By using a voltage boost auxiliary circuit fed by the gate drive power supply, the turn-off time of the MOSFET can be effectively reduced, which enables a high-frequency drive and reduction of the switching loss. It was confirmed through experimental tests that the turn-off dv/dt of the MOSFET...
In order to evaluate the energy efficiency of electrical drive systems for automation, simulations are made. For this purpose energy-accurate models are needed, which include all significant losses. The development and verification of an optimized simulation model for a permanent magnet synchronous motor with a nominal power of 1 kW is presented in this paper, using measurements in different operating...
Sensorless position estimation based on signal-injection methods always requires a resistance- or inductance-based anisotropy. Therefore, a short-circuited electrical winding can be attached on the rotor. As will be derived in this paper, this method leads to both a resistance- and inductance-based saliency. By an experimental test setup, both saliencies are analyzed and compared towards their accuracy...
Interior permanent magnet synchronous motors (IPMSMs) that employ rare-earth magnets are high-performance motors and are used in many applications. However, it is desirable to reduce the number of rare-earth magnets used in IPMSMs because of the high cost. If a non-rare earth magnet is used in IPMSMs with concentrated windings, the motor generates reluctance torque principally; however, this reluctance...
For thin steel plates, which are used in many industrial products including those of the automobile industry, we have proposed a magnetic levitation control system and confirmed its realization by means of a digital control experiment. However, the use of a limited number of electromagnets cannot suppress static deflection and high-order-mode elastic vibration, which are characteristics of a flexible...
On behalf of the Organizing, Steering and Technical Program Committees, we sincerely welcome you to the 2014 International Power Electronics Conference -ECCE Asia-, which we simply call IPEC-Hiroshrma 2014. The first IPEC was held in 1983, and since then, in 1990, 1995, 2000, and 2005, IPECs have been held in different locations, sponsored by IEEJ. Since 2010, IPEC has had the additional function...
The current sensor of the voltage-current sensor system proposed by us is two air-core sensing coils connected in series to each other with an opposite polarity. By doing so, it can measure the harmonics and power factor while removing the influence from power lines of other phases. When the sensors are surrounded by an iron case, emf may be influenced. However, it has been confirmed that a large...
The digital implementation of the integral operator is a delicate part in electrical drives. Many solutions are available in the literature, which avoid the well-known output drift of ideal digital integrators when a spurious DC offset is present at their input. Such solutions try to extend the integration accuracy toward the zero frequency as well, aiming to broaden their usability range for real...
SRMs, switched reluctance motors, are being expected as an excellent candidate for power sources in harsh environments due to the simple structure. In spite of many methods proposed to eliminate the rotor position sensor, which is needed to commutate the current correctly but not compatible with harsh environments, no successful sensor-less method has been seen so far. The method proposed in this...
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