著者

田中 主税 専田 禎

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.119, no.1, pp.32-35, 1999-01-01 (Released:2008-04-17)

参考文献数

4

被引用文献数

1

著者

三上 一郎 福原 尚志

出版者

一般社団法人 電気学会

雑誌

電氣學會雜誌 (ISSN:00202878)

巻号頁・発行日

vol.87, no.944, pp.919-928, 1967 (Released:2008-04-17)

参考文献数

10

著者

間屋口 信博 餘利野 直人 嶋村 悠太 谷岡 佳紀 佐々木 豊 造賀 芳文

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.139, no.4, pp.234-239, 2019-04-01 (Released:2019-04-01)

参考文献数

7

被引用文献数

3

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In this paper, we show the result of building and simulating a model that can optimally operate electric power supply by a system combining Photovoltaic Power Generation (PV) and Storage Battery (BT), mainly for residential customers. Especially focusing attention on BTs, by solving the objective function that minimizes electricity charges of customers by using the internal temperature and life characteristics of the storage battery as constraint conditions, an optimal solution is obtained. Compared with the case where the constraint condition of the storage battery is not taken into consideration, although the electricity charge increases, it is evaluated that the system can be used stably for a long time. Also, in a system that combines PV and BT, DC power bus (DC Bus) is controlled to a constant value for the purpose of supplying electric power to DC load and stable power supply to AC load.

著者

矢部 邦明 林 泰弘

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.138, no.2, pp.175-182, 2018-02-01 (Released:2018-02-01)

参考文献数

12

被引用文献数

1 3

---

This paper presents an evaluation of economical capacity of storage batteries equipped with residential PV systems. In around 2019, many of power companies' ten-year contracts with PV system owners will come to expire, pushing down the selling price of PV generated energy. This, if combined with a declining battery price, would make it more economical to self-consume PV generated energy than selling the electricity to the utilities. The authors explore the optimized storage battery capacity and charge-discharge pattern by using load and PV output data of 200 houses, and by linear programming. Results show 5.8kWh battery is suitable for an average house with 4.5kW PV system when the battery system price is about ¥60,000/kWh. The authors analyze the daily storage start timing's impact on reverse power which affects power system operation, the optimum combination of PV and battery capacity, and each house's deciding factors for optimum storage capacity and so on.

著者

矢部 邦明 林 泰弘

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.139, no.5, pp.363-371, 2019-05-01 (Released:2019-05-01)

参考文献数

17

被引用文献数

6

---

This paper presents economic evaluation of storage battery systems which increase the self-use of PV output at houses and buildings. The selling price of PV generated energy is decreasing. Battery energy storage systems (BESS) can increase the self-use of PV output, and decrease the volume of buying electric power. So, the introduction of BESS to houses and buildings equipped with PV systems will be economical when the price of BESS is decreased enough. Authors investigated the optimum BESS capacity and hourly charge-discharge pattern for a year, then evaluated annual cost. Daily load pattern of each house and building, and time-of-use electric rates affect the conditions to make BESS cost-effective. Such conditions are shown in this paper.

著者

武田 健吾 澤田 賢治 横川 慎二 新 誠一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.139, no.7, pp.786-795, 2019-07-01 (Released:2019-07-01)

参考文献数

10

---

In a system that suppresses power fluctuation caused by wind power and solar power generation by a storage battery (We call it wind turbine and photovoltaic power generation system, WPBHS), it is assumed that the number of constituent equipment is large. Therefore, by dividing the constituent equipment into a plurality of groups (We call it grouping), the operation plan is optimized dispersedly. In this case, it has been shown that WPBHS has fault tolerance by overlapping storage batteries in plural groups. Also, enumerating the grouping in advance allows us to switch the grouping and recover the system immediately when a system failure occurs. Motivated by this, we consider an overlapped grouping optimization problem focused on the performance deterioration and fault tolerance of the distributed management system. Enumerating the group, especially, the overlapped group requires large computational load with the more devices added. First, this paper formulates overlapped grouping optimization for WPBHS. Second, this paper proposes a graph representation method of the overlapped grouping and a near-optimal enumeration method.

著者

山口 雅英 伊賀 淳 石原 薫 和田 大志郎 吉井 清明 末田 統

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.123, no.3, pp.402-411, 2003 (Released:2004-03-31)

参考文献数

21

被引用文献数

11 14

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In this paper we examine the merits that a practical photovoltaic system combining photovoltaic generation with storage batteries would provide if used in ordinary residences. Various configurations and operation methods could be envisaged for such a system. In this research we examined the optimal battery capacity, operation methods, and economic effects for a system emphasizing economical merits for the user. We first calculated the hourly amount of photovoltaic generated electricity each month, and used data on average load patterns from actual measurements to calculate battery capacity. Next, taking battery capacity and photovoltaic module capacity/price as parameters, we calculated and evaluated the economic merits for ordinary residences. The results showed that the optimal battery capacity for combination with 3 or 5 kW photovoltaic generation is around 10 kWh, and that a combined system provides merits even though it entails higher photovoltaic module costs than the use of photovoltaic generation alone.

著者

齊藤 哲 光國 光七郎

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.139, no.8, pp.944-951, 2019-08-01 (Released:2019-08-01)

参考文献数

19

被引用文献数

1

---

Business processes are defined as functions and information relationships between functions in the phase of business requirement definition when enterprise information systems are developed. The function which is defined in the phase of business requirement definition is decomposed into the unit called a program or a module in the lower phase. The description method of the flow chart type such as DFD has been used for the visualization of the decomposition of function conventionally. In recent years, many enterprise information systems are improved by executing Business Process Re-engineering (BPR) or introducing Enterprise Resource Planning (ERP). In this case, the definition of the information relationships between functions is important. The examples utilizing the description method of the matrix type called G-RD are seen to visualize information relationships. Therefore, the comparative experiment is performed by system engineers to visualize the same business processes utilizing DFD and G-RD. In this experiment, system engineers decompose functions and visualize functions and information relationships between functions. And information relationships which are added or changed by the decomposition of functions are measured. As the result, it is proved that G-RD is able to have prevent omissions or errors of information relationships.

著者

本間 達 若松 秀俊

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. C (ISSN:03854221)

巻号頁・発行日

vol.137, no.10, pp.1329-1339, 2017

---

<p>Mathematical simulation is utilized to visualize the invisible phenomena, such as distribution of temperature and/or stress in a concerning object, by using properly structuralized nodes on each grid point of the orthogonal coordinate system. Here, the close-packed nodes with same effective radius are set on the vertex of regular tetrahedrons. Thus, the mathematical simulation calculating the interactions among nodes can be appropriately performed on the newly proposed coordinate system, which consists of continuous connection of regular tetrahedrons with six basic lattices. Then, the regular tetrahedron lattice coordinate system is well confirmed for the description of definite nodes having interaction with their neighboring ones.</p>

著者

芝 浩二郎 古屋 保 西 省吾 森 邦彦

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society (ISSN:03854221)

巻号頁・発行日

vol.126, no.8, pp.980-989, 2006-08-01

参考文献数

10

被引用文献数

1

---

We developed a prototype of the automatic go-record system using some image processing techniques. This system is composed of three units. Their units are a 1.10GHz laptop PC, a TV camera, and a pair of switches which tell the system to set a go-stone on the go-board. In this paper, we describe our implemented image processing techniques which are the method to generate a go-coordinates, the method to detect a location of a go-stone, and so on. As a result of the experiment on the prototype system, we confirmed that the correct go-record was generated in a stable indoor lighting condition.

著者

関口 貴哉 清水 敏久

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.139, no.8, pp.761-762, 2019-08-01 (Released:2019-08-01)

参考文献数

3

---

Various studies have been conducted on photovoltaic (PV) power generation systems that focus either on a generation control circuit (GCC) to prevent power reduction due to a partial shade or on an active power decoupling method (APD) to reduce the power pulsation with twice the utility frequency. However, to the best of the authors' knowledge, only few studies have examined the PV power generation systems in which both the GCC and the APD functions are installed. In this paper, a novel PV power generation system equipped with both the GCC and the APD functions is proposed, and its fundamental operation is verified.

著者

和田 圭二 平尾 高志

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.139, no.8, pp.765-766, 2019-08-01 (Released:2019-08-01)

参考文献数

4

---

This letter proposes a single-phase full-bridge inverter with a capacitor embedded in a bus bar. In order to reduce the switching ripple flowing in the electrolytic capacitor, the proposed structure embeds a barium titanate (BaTiO3) ceramic capacitor in the bus bar. The experimental results verified the operation of the inverter circuit, rated 300V, 4.1A with a switching frequency of 100kHz.

著者

萩原 善泰

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.121, no.7, pp.436-440, 2001-07-01 (Released:2008-04-17)

参考文献数

7

著者

大地 昭生

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.121, no.4, pp.262-265, 2001-04-01 (Released:2008-04-17)

参考文献数

5

著者

本田 幸夫 佐野 潔

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.119, no.8-9, pp.512-515, 1999-08-01 (Released:2008-04-17)

参考文献数

9

被引用文献数

1 2

著者

赤津 観 御供 頌弘 涌井 伸二

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)

巻号頁・発行日

vol.128, no.2, pp.125-130, 2008-02-01

参考文献数

11

---

This paper proposes a speed and position estimation methods by using a Hall effect sensor. The speed is estimated from the fluctuated current which can be observed on the control axis. The position is estimated from the estimated speed and is corrected from the pulse which is generated by the Hall effect sensor mounted on the machine. Although the speed control range is limitted since this method is based on the back EMF, the speed and the position can be estimated without any motor parameter is used. The prposed method is verified by the experiments which 120W SPMSM is used for the tested machine, the currnet control and the speed control results including the controlable speed range are breifly explained.

著者

渡部 泰明 小峰 清香 五箇 繁善 佐藤 隆幸 関本 仁 内田 剛

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.125, no.8, pp.1179-1184, 2005 (Released:2005-11-01)

参考文献数

8

被引用文献数

2 2

---

This paper describes an analysis of the close to carrier phase-noise characteristics of the narrow-band Colpitts oscillators. The open-loop impedance, that is, series of the SC-cut resonator and the oscillator active circuit, is calculated using a linear circuit model with a non-linear transistor model. It is shown that the loaded Q can be improved by introducing the resonator filter in the oscillation circuit. Based on the Leeson's model, the near carrier phase-noise is estimated using the calculated Q values. The results corresponded well with the previous experiments. It is also shown that the phase-noise can be exceedingly improved, that is, under -148 dBc/Hz at 10Hz offset, by using resonator filter with high Q.

著者

佐藤 貴彦 新明 脩平 仲里 三希 見上 慧 佐藤 智矢 境野 翔 大西 公平

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.131, no.3, pp.283-290, 2011-03-01 (Released:2011-03-01)

参考文献数

19

---

This paper proposes a knee stretch walking method for biped robots; the method involves the use of the toes and heel joints to increase walking strides. A knee can be stretched by switching control variables. By a knee stretch walking with heel contacts to the ground and toe takeoffs from the ground, biped robots can increase their walking stride and speed. The validity of the proposed method is confirmed by simulation and experimental results.

著者

原島 博

出版者

一般社団法人 電気学会

雑誌

電氣學會雜誌 (ISSN:00202878)

巻号頁・発行日

vol.101, no.8, pp.782-786, 1981-08-20 (Released:2008-04-17)

参考文献数

21

著者

土居 元紀 井上 博司 青木 優太郎 大城 理

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌E(センサ・マイクロマシン部門誌) (ISSN:13418939)

巻号頁・発行日

vol.126, no.8, pp.457-463, 2006 (Released:2006-11-01)

参考文献数

8

被引用文献数

6 8

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The detection of accidents on elderly person living alone and the communication between the elderly person and his/her family are very important. This paper describes a new method for tracking and fall detection of elderly person using omni-directional image sensor, and the Itawari-kan communication system that supports their communications and gives alarms for detected accidents on the elderly person. This system tracks the person's head position in real-time by image processing on images captured by some omni-directional image sensor. Then, the system transmits the information of the detected head position to another site. The computer of recipient site generates the computer graphics animation of the tracked person and displays the animation on a monitor. When the system detects an accident from the head position, the system gives an alarm. This method reduces traffic on network and keeps the privacy for the tracked person. We made a prototype system of the Itawari-kan communication system. Experiments on the system showed good feasibility of the proposed system.