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Syota Yamada, Miona Fukuoka, Masahiro Nishimoto, Yoshitaka Kawabata
2018 Volume 44 Pages
56-65
Published: 2018
Released on J-STAGE: October 09, 2019
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Recently, wind power generation has attracted attention as a system using natural energy. The variable speed control of wind power generation using a permanent magnet synchronous generator (PMSG) is not required exciter and gear, so there is an advantage that low cost and low noise. However, it is necessary to maintain the position sensor in this system. To solve this problem, this paper proposed the position sensor-less high efficiency wind power generation systems that use the estimation of the internal electromotive force. From several simulation tests results using proposed system, good results can be obtained.
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Yuhki Kamatani, Takeo Nishikawa, Hironori Tauchi, Takeshi Uematsu, Tos ...
2018 Volume 44 Pages
66-72
Published: 2018
Released on J-STAGE: October 09, 2019
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Miniaturization and low cost of PCS (Power Conditioning System) is important for popularization of renewable energy. Especially AC reactor (ACL) is dominant in both volume and cost amount of PCS. If the ACL impedance value becomes smaller than the Grid-impedance between PCS and Grid, it is pointed out that a controllability of PCS has a risk of unstable. In this paper, we propose a control method that PCS itself estimates Grid-impedance and sets optimal control parameters after PCS installation as well. This method can be realized only by adding elements to existing configurations not change the system. As a result, it is able to contribute to downsizing and low cost of the entire PCS.
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Kenichi Nishijima
2018 Volume 44 Pages
73-79
Published: 2018
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In the power electronics field, the movement that the EMI noise standard is revised is being carried out by IEC. In this paper, we investigate measures to apply frequency spreading to the frequency range and measurement conditions of the new standard(below 150 kHz), and consider measures that can achieve both noise reduction performance and miniaturization of electronic equipment and low standby power performance.
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Yuki Yamamoto, Toshiji Kato, Kaoru Inoue, Taiki Sakiyama
2018 Volume 44 Pages
80-89
Published: 2018
Released on J-STAGE: October 09, 2019
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A grid-connected inverter must be designed to assure stable operation. Stability analysis of the system is one of the most important design process. This paper investigates and compares these stability analysis methods. In frequency domain, according to the impedance method, frequency characteristics of an output impedance or admittance are calculated and checked if it satisfies the Nyquist criterion. Three types of meth- ods are often utilized for this frequency analysis. In time domain, a unique analysis method, which is based on the eigenvalue analysis of the Poincar´e map or the sensitivity matrix of state-variables for perturbations along an operating trajectory, is also utilized. These four methods are compared and discussed for their features to investigate and design stable grid-connected inverter systems by simulation and experiment.
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Toru Miyoshi, Akira Kawata, Shigeo Masukawa
2018 Volume 44 Pages
90-96
Published: 2018
Released on J-STAGE: October 09, 2019
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Isolated high-frequency DC-DC converters are widely used in industry, transportation and home appliances. However, there is no general design method for high frequency transformer of DC-DC converter. Therefore, in this paper, a design method of high frequency transformer is proposed by the proportional increment method using electric loading, magnetic loading, maximum magnetic flux density whose consider temperature rise of iron core. From the prototype high frequency transformer 200V, 2.5kVA, 20kHz, It is clarified that the proposed method is effective for the design of high frequency transformers.
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Hirokazu Takigawa, Takuya Tomioka, Takuya Okagaki, Yoshimichi Ito, Isa ...
2018 Volume 44 Pages
97-103
Published: 2018
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This paper describes a result of a fundermantal study on harmonics in a circulating current of a 500Hz MMC. 500Hz MMC is a promising converter for the power transmission from an off-shore Wind Farm. However, because of limitation of switching frequency of power switching device used for the converter, it has a problem of lower even order harmonics. The effect of time step range and carrier frequency of PWM controller and harmonics suppression by the insertion of blocking filter are studied in this paper.
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Futoshi Kondo, Takuto Nishitani, Hideto Yonemori, Hiromasa Takeno
2018 Volume 44 Pages
104-111
Published: 2018
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In recent years, to realize the effective power transmission function under the long distance condition, the magnetic resonance have been attracted. This paper deals with the novel power transmission coil structure and its effectiveness to be applicable for the WPT (Wireless power transmission) system, which consists of the additional resonant tank circuit topology. In accordance with the discussion of the magnetic resonance. The operation of additional resonant tank circuit topology to emphasize power transmission efficiency are explained and discussed in this paper on the basis of the simulating results.
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Hiroshi Ohsawa, Sho Sukegawa, Yosuke Asano, Satoko Iida
2018 Volume 44 Pages
112-120
Published: 2018
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In this paper, a voltage equilibrate circuit which applied to the multiple EDLCs (Electric Double-Layer Capacitors) by using self-oscillation circuit is proposed. Additionally, the proposed circuit has the ability of the current control on EDLC. Accordingly, the current characteristics result of simulation and experiment in the proposed circuit are described mainly. A proposed circuit is used self-oscillation technique, and the circuit is supplied voltage form the EDLC therefore the circuit structure is very simple, namely using only 19 electric parts. Generally, when connecting two EDLCs or two batteries with a converter, a large current may flow between the two EDLCs or the battery. However, in the proposed circuit, even if a voltage difference occurs between the EDLCs, it showed that the circuit maintains the zero-current switching mode and does not flows large current if it is the potential difference in the design. In addition, in this paper the range of the voltage that keeps the zero-current switching mode is obtained by the formula, and the calculation expression for obtaining the maximum p-p current value of the circuit is also shown.
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Takashi Umeda, Masayuki Sanada, Shigeo Morimoto, Yukinori Inoue
2018 Volume 44 Pages
121-127
Published: 2018
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IPMSM using rare-earth sintered permanent magnets generally have high performance. However, since rare-earth sintered magnets contain dysprosium (Dy), they are very expensive and there is concern about the stability of supply of this resource. Therefore, the use of the IPMSM using Dy-free rare-earth bonded magnet is considered. However, the rare-earth bonded magnet increases the risk of irreversible demagnetization. In this study, we examine the structure of IPMSM using rare-earth bonded magnets to solve the issue. Therefore, it is necessary to examine the method of demagnetization suppression. In this paper, we analyzed the influence on the occurrence of irreversible demagnetization by changing the number of the armature winding and the magnet shapes of the rotor.
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Yuki Ishikura, Tatsuya Hosotani, Masayoshi Yamamoto
2018 Volume 44 Pages
128-134
Published: 2018
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This paper presents a bidirectional convert using by multistage FET driving technique with voltage balance function. The voltage balance function can reduce influence of the voltage unbalance phenomenon which drain voltage fluctuation depending on output current. The voltage unbalance phenomenon is clarified by using an equivalent circuit of FETs connected in series. The necessity of voltage balance function is discussed, and verified in experiment. The experimental results have proven that the bidirectional converter by using the driving technique can achieve 98% or more power conversion efficiency from 170 W to 1000 W of power range, and a maximum power conversion efficiency of 99.2%.
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Kenji Koyama, Mitsuhiro Tanaka, Satoshi Ogasawara
2018 Volume 44 Pages
135-141
Published: 2018
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In CISPR 14, conducted-EMI emissions and disturbance power are regulated as EMC standards for home electric appliances such as inverter-driven air conditioners. If EMI filter design can not conform to these two standards, longer measurements and redesign are required. Therefore, not only the conducted-EMI emissions but also the disturbance power simulation technique are required. In this paper, we construct the disturbance power simulation technology of the inverter-driven air conditioner, and report the result of comparing the simulation and measured value.
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Koji Hamaoka, Koji Kubo, Atsushi Yamada, Satoshi Komukai, Shiro Maeda, ...
2018 Volume 44 Pages
142-148
Published: 2018
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Electric motorizing with inverter in the vehicle, and in the mechanical machine become popular rapidly. SMACH’s universal inverter driver is a tool to support such development for electric motorizing. Universal inverter driver can drive various motors, various position sensors, and have wide-range lineup of the capacity from household appliance to large vehicle. We mainly introduce automatic tuning function that can detect electrical characteristic of the motor.
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Yoshitaka Kawabata, Taisei Okamoto, Daiki Tanaka, Yohsuke Oura, Hirosh ...
2018 Volume 44 Pages
149-157
Published: 2018
Released on J-STAGE: October 09, 2019
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The multi-cell inverter can obtain the high voltage power of a few kV without an output transformer, and has the low distortion and the characteristics of high efficiency. Therefore, the multi-cell inverter is suitable for the use of a power system, and the application to STATCOM or an energy storage system is studied. In the application which a system coordinates, the performance which maintains dc voltage at a steady value is required, taking in the effective power corresponding to loss. However, it is difficult to control the dc voltage of all the cells by the reason of the variation in the characteristics of each cell similarly. Therefore, dc voltage becomes unequal. In order to solve these problems, this paper proposes the system which equalization control of the dc voltage of all the cells. The equalization control uses interphase power decoupling control and inter-cell balancing control. From experimental results using mini model, the good results were obtained.
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2018 Volume 44 Pages
158-159
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
160
Published: 2018
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[in Japanese], [in Japanese]
2018 Volume 44 Pages
161
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
162
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
163
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
164
Published: 2018
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[in Japanese], [in Japanese]
2018 Volume 44 Pages
165
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
166
Published: 2018
Released on J-STAGE: October 09, 2019
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
167
Published: 2018
Released on J-STAGE: October 09, 2019
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
168
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
169
Published: 2018
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
170
Published: 2018
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
171
Published: 2018
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
2018 Volume 44 Pages
172
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
173
Published: 2018
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[in Japanese], [in Japanese]
2018 Volume 44 Pages
174
Published: 2018
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[in Japanese], [in Japanese]
2018 Volume 44 Pages
175
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
176
Published: 2018
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
177
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
178
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
179
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[in Japanese], [in Japanese]
2018 Volume 44 Pages
180
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
181
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
182
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
183
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
184
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[in Japanese], [in Japanese], [in Japanese]
2018 Volume 44 Pages
185
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
2018 Volume 44 Pages
186
Published: 2018
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
2018 Volume 44 Pages
187
Published: 2018
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