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2021 Volume 47 Pages
87-90
Published: 2021
Released on J-STAGE: September 18, 2022
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Ohuchi Kazuki, Takeda Tomoya, Hirase Yuko
2021 Volume 47 Pages
91-98
Published: 2021
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Renewable energy (RE) is being rapidly introduced for decarbonization, and research on high-voltage direct current (HVDC) transmission for offshore wind power generation over long distances and high efficiency is highly expected. On the other hand, in the onshore AC power transmission and distribution system, there are problems such as voltage and frequency fluctuations due to the mass introduction of distributed energy resources (DERs). The movement to install the control function of smart inverters, which contribute to the stabilization of the AC system, in the grid-connected inverters of DERs is accelerating.
Virtual synchronous generator (VSG) control is one of the smart inverter controls expected to contribute to the stabilization of the AC system. Therefore, in this study, conventional power control and VSG control are applied to the control of the modular multi-level converter (MMC)-based poles of the HVDC transmission system, and the AC/DC system fault tolerances of the entire system with various short circuit ratios (SCRs) are reported.
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Nakajima Atsushi
2021 Volume 47 Pages
99-107
Published: 2021
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There are many areas in the world where clean drinking water cannot be provided stably. Therefore, it is important to provide water to such areas. There are several methods to produce drinking water. For example, one way is to remove the salt or metal from sea water by distillation etc. In this study, a unique water production system that produces water by condensing gas water in the air using a photovoltaic cell and a Peltier element is proposed. The water production method is also briefly described in this paper. The photovoltaic cell generates electricity, and then the Peltier element makes cool air that is below the dew point, which results in liquid water appearing. This system could be used worldwide to easily provide drinking water. In this paper, the author focus on the power converter part and examine the multi-output DC-DC converter that controls the solar cells, Peltier element, the airflow fan and Peltier element cooling fan. The converter has only one inductor at the output stage, but it is able to control one input and three outputs individually.
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Onoe Ryouma, Matayoshi Hidehito, Morizane Toshimitsu, Omori Hideki
2021 Volume 47 Pages
108-116
Published: 2021
Released on J-STAGE: September 18, 2022
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Currently, Maximum Power Point Tracking (MPPT) is the system used to control the rotational speed of a wind power system. MPPT control that follows the rotational speed that can obtain the maximum power for that wind speed. However, under wind conditions in regions with large wind speed fluctuations, it is difficult to quickly control the rotational speed of large wind turbines with large inertia. The effect is to reduce the power output by up to 40% at most. In this study, RSM (Rotation-SpeedMaintenance) control is verified as a control algorithm for increasing the amount of electricity generated in situations with large wind speed fluctuations. The RSM control focuses on maintaining the rotational speed. RSM control tracks the optimum rotational speed in the same way as MPPT control, but RSM control maintains a higher rotational speed. By maintaining a high rotational speed, high wind speeds are efficiently converted to power in situations with large wind speed fluctuations. Furthermore, RSM control increases the input torque, thus improving acceleration control. MPPT control and RSM control are compared under the same conditions. The effectiveness of RSM control is verified via simulations.
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Majima Satoshi, Matayoshi Hidehito, Morizane Toshimitu, Omori Hideki
2021 Volume 47 Pages
117-123
Published: 2021
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Power management methods in DC microgrids are attracting attention in order to increase the introduction rate of renewable energy sources. In this study, the operation method when a large number of photovoltaic (PV) systems are introduced into the microgrid is verified.
When there is an excessive supply of power, the proposed pseudo droop control of the PV system suppresses output power and maintains an appropriate balance between the power supply and the power demand. Simulations are used to investigate the effectiveness of pseudo droop control.
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Ryohei Yabuki, Hideto Yonemori, Hiromasa Takeno
2021 Volume 47 Pages
124-130
Published: 2021
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in recent years, there has been increasing interest in WPT (wireless power transmission) by using a magnetic resonant phenomenon.
In this WPT, has many advantages in power transmission efficiency under the conditions of low coupling condition.
In this paper, a newly developed power transmission method which consists of resonant tank configuration that is symmetrical in terms of the power transmission/receiving coil are proposed and discussed under a condition of resonant parameter fluctuation with prototype circuit.
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Ota Morito, Yano Takahiro, Ohashi Ryota, Manaka Yuto, Kawabata Yoshita ...
2021 Volume 47 Pages
131-140
Published: 2021
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We have already proposed the new control method of the SP-type wireless power transfer using DAB-type DC/DC converter and power transmission is possible in both directions, improving efficiency. When we actually manufactured the experimental setup, there was a problem that the transmission efficiency decreased when the degree of coupling between the coils was reduced.
In order to solve this problem, in this paper, we define a new parameter “design coupling coefficient” and redesigned. By doing so, if the external reactor is selected optimally, the resonant capacitors on both sides are determined only by the frequency and self-inductance, and a clear design that does not depend on the degree of coupling becomes possible.
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Takahashi Hiroyuki, Kaneda Yukio, Takeuchi Somi, Kubota Keizo, Kawabat ...
2021 Volume 47 Pages
141-148
Published: 2021
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Since the permanent magnet type synchronous generator (PMSG) has low loss and high efficiency, various power generation methods have been proposed and are widely used for wind power generation. However, in order to control the permanent magnet types synchronous generator, a sensor that detects the rotation angle is required, which is disadvantageous in terms of cost and maintenance. The authors proposed a wind power generation system that connects to a DC bus without a position sensor, inspired by a high power factor converter for grid interconnection, but estimated the internal electromotive force and used PLL. Since it is a method of finding the angle and frequency, there is a problem that the frequency is not locked at low rotation where the voltage and current are small, and the control tends to be unstable. In order to solve this problem, in this paper, we propose a method of stabilizing the frequency, which is the reference of the PLL, by using a feedback type configuration and using a rate limiter.
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Kakinuma Rin, Yamamura Naoki
2021 Volume 47 Pages
149-155
Published: 2021
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Permanent Magnet Type Synchronous Generator or Induction Generator is used for the wind power generation
system. However, Permanent Magnet Type Synchronous Generator is high material cost and Induction Generator is low efficiency. Therefore, we focus on Switched Reluctance Motor (SRM) which is characterized by simple structure, toughness, and high efficiency We have studied a small size wind power generating system which uses the SRM as SRG (Switched Reluctance Generator).
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Imazeki Mitsuyoshi, Satou Daiki, Masukawa Shigeo
2021 Volume 47 Pages
156-162
Published: 2021
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In this paper, a DC-DC converter for reducing ripple involved in input current and obtaining high voltage ratio is proposed. The proposed converter is based on the Floating -Interleaving Boost Converter (FIBC) for fuel cell and connects boost choppers to output terminals of FIBC in series. A conventional small fuel cells use a DC-DC converter to boost the output voltage of the fuel cell. The boost ratio is required to be about 6 to 11 times. In additionally, it is required to reduce input current ripple which causes a sintering phenomenon in the fuel cell. In this paper, the circuit operation modes of the proposed converter are discussed, and the boost ratio and input / output current are derived. Then, the effect of reducing the input current ripple and obtaining high voltage gain of the proposed converter can be clarified by simulation and experimental results.
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Takeuchi Kosuke, Alsharif Faramarz, Umemura Atsushi, Takahashi Rion, T ...
2021 Volume 47 Pages
163-169
Published: 2021
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In recent years,distributed power sources such as solar power and wind power,which are renewable energies,
have been increasing.Since the distributed power sources do not have the inertia and synchronization power which are the fundamental characteristics of synchronous generators,they can have an adverse effect on the grid.Various virtual synchronous generator control methods have been proposed and reported.In this paper, the reactive power priority control and the switching control of slope of power angle curve are proposed, and their effectiveness is verified.
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2021 Volume 47 Pages
170-173
Published: 2021
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Manjuu Nozomi, Kakigano Hiroaki
2021 Volume 47 Pages
174
Published: 2021
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Yasuda Utena, kiwa Nagayasu, Michihira Masakazu
2021 Volume 47 Pages
175
Published: 2021
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KATAOKA Yuki, IKEUCHI Taketo, MOTEGI Shin-ichi
2021 Volume 47 Pages
176
Published: 2021
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Maeda Yusuke, Kakigano Hiroaki
2021 Volume 47 Pages
177
Published: 2021
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Ogawa Kazuki, Kakigano Hiroaki
2021 Volume 47 Pages
178
Published: 2021
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Kitamura Akihiro, Morizane Toshimitu, Matayoshi Hidehito, Omori Hideki
2021 Volume 47 Pages
179
Published: 2021
Released on J-STAGE: September 18, 2022
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Yomura Kazuki, Kato Toshiji, Inoue Kaoru
2021 Volume 47 Pages
180
Published: 2021
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Nakamoto Taku, Oomori Hideki, Sakamoto Kunihiro, Morizane Toshimitsu, ...
2021 Volume 47 Pages
181
Published: 2021
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Mekawa Kosuke, Yabuki Ryohei, Yonemori Hideto, Takeno Hiromasa
2021 Volume 47 Pages
182
Published: 2021
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[in Japanese], [in Japanese], [in Japanese]
2021 Volume 47 Pages
183
Published: 2021
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Hayakawa Yuta, Hasegawa Masaru
2021 Volume 47 Pages
184
Published: 2021
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Haginaga Yuta, Hasegawa Masaru, Mutuwo Tomita
2021 Volume 47 Pages
185
Published: 2021
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2021 Volume 47 Pages
186
Published: 2021
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Kengaku Genki, Omori Hideki, Tsuno Masahito, Morizane Toshimtsu, Matay ...
2021 Volume 47 Pages
187
Published: 2021
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Yoshimura Yuto, Masuda Itsuki, Nakano Shinichi, Manabu Ishitobi
2021 Volume 47 Pages
188
Published: 2021
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Soichiro Oyoshi, Kazuki Matsumoto, Kawakami Taichi
2021 Volume 47 Pages
189
Published: 2021
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Oyoshi Soichiro, Matsumoto Kazuki, Kawakami Taichi
2021 Volume 47 Pages
190
Published: 2021
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Maeda Yoshiyasu
2021 Volume 47 Pages
191
Published: 2021
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Hashimoto Tatsuhiro, Nishijima Kenichi
2021 Volume 47 Pages
192
Published: 2021
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Yano Sota, Oue Ko, Kato Toshiji, Inoue Kaoru
2021 Volume 47 Pages
193
Published: 2021
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Matsunami Hiroaki, Kakigano Hiroaki
2021 Volume 47 Pages
194
Published: 2021
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Ibaraki Keita, Higuchi Junya, Miura Yushi
2021 Volume 47 Pages
195
Published: 2021
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Furukawa Mitsuki, Miura Yushi
2021 Volume 47 Pages
196
Published: 2021
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Onitsuka Takuya, Takagi Sigeyuki
2021 Volume 47 Pages
197
Published: 2021
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Hiramatsu Shunya, Yamamura Naoki
2021 Volume 47 Pages
198
Published: 2021
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Tomoyasu Haruka, Omori Hideki, Morizane Toshimitsu, Matayoshi Hidehito
2021 Volume 47 Pages
199
Published: 2021
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Nishi Ryusuke, Matsumoto Hirokazu
2021 Volume 47 Pages
200
Published: 2021
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Takai Hisanari, Kato Toshiji, Inoue Kaoru
2021 Volume 47 Pages
201
Published: 2021
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Satake Eiji, Inoue Yukinori, Morimoto Shigeo, Sanada Masayuki, Totoki ...
2021 Volume 47 Pages
202
Published: 2021
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