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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...
A novel control scheme called symmetrical chop plus phase-shift (SCPS) control, allowing six switches of the three-level full-bridge converter to achieve zero voltage switching (ZVS) and reducing the total harmonic distortion (THD) of the transformer primary side voltage is proposed in this paper. The traditional control schemes for three-level full-bridge converter to achieve ZVS ignored the impact...
This paper investigates the characteristics of parallel connected three phase inverters based on modular design and distributed control. Every inverter module has a local hardware manager and the whole system has a central application manager. The hardware managers and application manager are connected together by the optical fiber to build a fiber ring net structure. The fiber ring net can achieve...
This paper deals with a 3kW multilevel inverter used for PV applications. A comparison has been made based on simulations using IGBTs and SiC MOSFETs to see how much efficiency can be gained when SiC diodes are used. A prototype with the same IGBTs and SiC MOSFETs has been built but using regular soft-recovery Si diodes instead of SiC diodes. Efficiencies and switching transitions for different switching...
This paper discusses miniaturization of a single-phase grid connected inverter, which has power decoupling function for PV. The power ripple of twice grid frequency is compensated in the proposed circuit with the small capacitor (50 µF) at 200 W. However, the buffer inductor in the proposed circuit becomes large because the buffer inductor current is fluctuated at twice grid frequency by power ripple...
It is an ideal to perform a combined test of an inverter and a motor for a smooth start-up at the site. There is a method to carry out a full load test without driving a machine. It is called “Back-to-back test”. It is possible to obtain 25MW output of testing facility in our company. In this paper, it is introduced the performance evaluation of the test results such as, torque ripple analysis of...
Large capacity motor drive equipment, especially those with low harmonics and high efficiency, are in demand in the industrial field. In general Voltage Source Inverters (VSI) have low harmonics and high efficiency and have been widely applied in many steel plants. However, the cycloconverter drives which were applied in 1980's are still operating in many steel plants. The cycloconverter has low power...
A soft-switching single-phase unified power quality conditioner (UPQC) using simple resonant units is proposed in this paper. In the proposed UPQC, all main switches operate at zero-voltage-switching (ZVS) turn-on and all auxiliary switches operate at zero-current-switching (ZCS) turn-off. The proposed UPQC consists of a soft-switching series active power filter and a soft-switching shunt active power...
This paper proposes a novel three-phase PWM ac-ac converters, presents detailed circuit operation and operating principle. The proposed converters employs the basic switching cell structure and coupled inductor to solve commutation problem without sensing input voltage polarity. The commutation scheme allows that the proposed converters can be short and open circuited without generating high switch...
In this paper, the novel normally-on type bidirectional switch, in which is comprised of SiC-JFET, SiC-SBD, and Si-IGBT is proposed for one of a protection method of the Matrix Converter (MC). When the MC becomes gate block situation, a diode clamp circuit or auxiliary circuits keeps inductive load current loop in a conventional MC utilized a bidirectional switch. We focus that the normally-on type...
The explanations of the PWM strategies of a direct matrix converter are classified into “Direct AC/AC converter”, “Virtual AC/DC/AC Conversion” and “Instantaneous Space Vector Diagram”. Since the PWM strategies of matrix converters are complex, it may be difficult to understand the same PWM strategies under the different explanations. This paper presents the visualization of the PWM waveforms of the...
This paper proposes a space vector modulation of a high frequency AC-inked matrix converter which is applied to an electric transformer system. The one of problem of a commercial frequency transformer is bulky and heavy. In order to resolve this problem, we propose to use a high frequency transformer driven by three-phase to single phase matrix converter. In this paper, the virtual indirect control...
This paper discusses pulse density modulation (PDM) control methods for a single-phase to three-phase matrix converter for high-frequency applications such as the grid interface converter for a wireless power transfer system and high-frequency transformer link system. The input frequency for this converter is assumed as several hundred kHz, and at the same time outputting a commercial frequency, i...
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 presents a design procedure for an output current control and an output damping control of a matrix converter to suppress LC filter resonance and improve transient current response. With a conventional design method which gives preference to stability, the output damping control causes a large output current overshoot and a control bandwidth of the output current is affected. Therefore,...
For high power three-level NPC grid connected inverter, which has the characteristics of low switching frequency and complex harmonic distribution of output current waveform, it deduces the total output filter inductor expression and researches the relational expression between inductance ratio, damping ratio and resonant frequency, harmonic attenuation ratio, as well as damping power. Based on this,...
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 propose an active-clamping flyback converter using a integrated transformer. The proposed converter is composed of two active-clamp flyback converter. The presented converter can equally share the total load current between two secondaries so that the rectifier diode conduction loss can be decreased. Otherwise, the main switch of any converter as auxiliary switch for the other one, so that...
This paper proposes the new LLC converter with unique control method. Generally, LLC resonant converter, which is controlled by PFM, has the drawback of (1) difficulty of PWM controllability, (2) difficulty of constant current limitation, and (3) narrow input voltage range limitation. These difficulties come from the resonant operation. In order to overcome those drawbacks, a hybrid control of PFM...
EDLCs offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilization in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region...
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