著者

田村 滋

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.135, no.1, pp.2-8, 2015 (Released:2015-01-01)

参考文献数

21

被引用文献数

1

---

Battery Energy Storage system (BESS) is prospective energy storage in Smart Grid and Hybrid Energy Storage System (HESS) composed of two different kinds of battery is also studied to achieve better performance and lower cost than single kind of BESS. The cost issue, however, has not been evaluated explicitly so far. On the other hand, BESS is studied and expected for ancillary service although HESS has not been applied to frequency control in power system. This paper focuses on HESS application to frequency control and its economic analysis. In this paper, the important battery characteristics in the application to power system are introduced and two kinds of HESS are evaluated in terms of their cost when they are applied to frequency control. In addition, the cost is analyzed for when HESS is used for Peak Shift as well as frequency control.

著者

大下 陽一 加藤 達郎 杉山 修一 鈴木 克巳

出版者

The Institute of Electrical Engineers of Japan

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.121, no.7, pp.818-821, 2001-07-01 (Released:2008-12-19)

参考文献数

14

著者

野田 慎一郎

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.134, no.3, pp.NL3_6-NL3_8, 2014-03-01 (Released:2014-03-01)

参考文献数

1

著者

笹森 崇行 澤谷 邦男 安達 三郎 朝日 道成 有田 高治 岡村 信男

出版者

The Institute of Electrical Engineers of Japan

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.122, no.3, pp.424-428, 2002-03-01 (Released:2008-12-19)

参考文献数

11

---

It has been pointed out that a very strong electromagnetic field is induced occasionally along aerial power lines located near a medium wave (MW) broadcasting station, and the construction and the maintenance of power lines are sometimes endangered. We have presented a method to predict a dangerous span before the construction and the maintenance, and a use of a loading of appropriate inductor to decrease the induced field the case where the resonant loop is composed of three power lines, i.e., a top conductor, a middle conductor and a bottom conductor and part of towers. In this paper, the effect of loading inductor for the case that the resonant loop includes a ground wire is presented. Since the ground wire is connected directly to the tower, the inductor can not be loaded into the ground wire. It is shown that the field strength in the vicinity of three power lines can be suppressed by loading the inductor to three power cables each. However, the field in the vicinity of the ground wire can not be suppressed significantly. Measured values of the field strength in the vicinity of the bottom conductor is presented to confirm the suppression effect.

著者

兌 瀟偉 伊藤 雅一 藤本 悠 林 泰弘 朱 桂萍 姚 良忠

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.3, pp.212-224, 2019-03-01 (Released:2019-03-01)

参考文献数

34

被引用文献数

3

---

With the increase of wind power penetration in power system, the uncertainty caused by wind farm forecast error is enlarged which results in deterioration of wind power curtailment. In order to optimize the capacity of battery storage for mitigating forecast error, firstly it is necessary to improve the accuracy of forecast error model. This paper proposed a modeling method of forecast error time series in usage of beta distribution. Varying with forecast output, parameters of the beta distribution are estimated by maximum likelihood estimation. Autocorrelated forecast error obeying beta distribution is generated by correlated Monto-Carlo simulation. Based on the forecast error model, an optimization method is proposed to determine the optimum size of battery storage for mitigating forecast error. Through maximizing the total profit composed of electricity sales revenue, penalty and battery cost, the optimum size of battery storage is calculated. The results show that the forecast error model proposed in this paper is able to simulate both probability density function and autocorrelation correctly, which is beneficial to improving the accuracy and economy of battery storage sizing.

著者

匹田 政幸

出版者

The Institute of Electrical Engineers of Japan

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.122, no.4, pp.482-485, 2002-04-01 (Released:2008-12-19)

参考文献数

42

---

This article deals with trend of sensing, monitoring, diagnostics and maintenance technology in electric power apparatus, especially, gas insulated switchgear (GIS). Partial discharge measurement is one of key technology and the most promising method for developing highly reliable diagnostics for insulation performance of the high voltage apparatus. The review is made by focusing UHF sensors and acoustic method for detecting electromagnetic and ultrasonic waves caused by partial discharges in GIS, respectively.

著者

宮嵜 悟

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.12, pp.NL12_8, 2018-12-01 (Released:2018-12-01)

著者

鈴木 守 石井 隆裕 神尾 光一 鈴木 浩 伊庭 健二

出版者

The Institute of Electrical Engineers of Japan

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.112, no.10, pp.937-944, 1992-10-20 (Released:2008-12-19)

参考文献数

9

被引用文献数

3

---

The idea of unbalanced load flow calculation was proposed many years ago. At that time, however, the needs for such techniques was not an urgent one. Modern power system networks are comprised of long untransposed transmission lines. Therefore, for some kinds of analysis, it is now almost impossible to treat a system as though it were a symmetrical network. The aims of most previous studies were oriented to solve voltage/current imbalance in local or small systems, as local imbalance was a serious concern. This is still an important issue, but more recently our needs have become concentrated on practical bulk power systems, since principal EHV lines are entirely untransposed. In this paper, the development of practical unbalanced load program and practical experience with it are reported. This program was developed for steady state analysis of large-scale practical networks under many possible unbalanced condition. The Newton-Raphson method in polar coordinates is used, since fast and moderate convergent characteristics are suitable for solving solutions. The program was applied to practical case studies. The models contain all of the 500 kV and most of the 275 kV overhead transmission lines in TEPCO. Since the density of the Jacobian matrix is higher than in single phase load flows, the number of non zero elements is extremely large. Convergent characteristics are excellent in all cases. The fear of numerical instability has been allayed.

著者

林 重雄 川田 明 長澤 隆士 横山 尚登

出版者

The Institute of Electrical Engineers of Japan

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.112, no.11, pp.969-976, 1992-11-20 (Released:2008-12-19)

参考文献数

8

被引用文献数

1 3

---

The paper demonstrates that normal power system operating data may be used to determine the power-frequency characteristics in power system. Data are processed as random signals using spectral analysis techniques and the results estimate the generator and load power-frequency characteristics as transfer functions. The generator characteristics Kg is determined as a transfer function of the system in which input signals are frequency fluctuation ΔF and generator power setting signal ΔPg and output signal is generator power output ΔPe. For estimating the load characteristics Kl, there is a difficulty. There is a relation of ΔPl=ΔLo+KlΔF, between actual load ΔPl, ideal load under the state of nominal frequency ΔLo and fluctuation of system frequency ΔF. While, because it is impossible to measure ΔLo directly, ΔLo and KlΔF can not be separated. As to a partial system, when its capacity is small enough compared with the total system capacity, the contribution of ΔLo in a partial system to ΔF of the total system may be ignored, that is, ΔF and ΔLo are considered as independent phenomena. So, the cross-spectrum of ΔF and ΔLo decreases to zero according to the increase of data in number and Kl of the partial system can be estimated.

著者

斎藤 浩海

出版者

The Institute of Electrical Engineers of Japan

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.119, no.8-9, pp.897-900, 1999-08-01 (Released:2008-12-19)

参考文献数

28

被引用文献数

1 1

著者

林 重雄 米田 孝史 川田 明 長沢 隆士 森田 恵

出版者

The Institute of Electrical Engineers of Japan

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.113, no.11, pp.1231-1238, 1993-11-20 (Released:2008-12-19)

参考文献数

12

被引用文献数

1 1

---

It is important to include the behavior of load in studies of loss of generation and consequent load shedding and also in studies of long-term dynamics of a power system. This paper proposes a method which estimates load-frequency and load-voltage characteristic constants separately at the same time, by using normal operating data.The power system can be represented as an equivalent model which is composed of a major bus load, an equivalent impedance and a voltage source behind it. When the load capacity is small enough compared with the total system capacity, variations of active power of the load have little effect on frequency changes in the total system. Voltage changes behind the equivalent impedance are caused by variations of the operating condition in the external system, so voltage changes are independent to variations of active and reactive power of the major bus load under the state of nominal frequency and voltage. So coherences between them decreases to zero according to the increase of data in number and it is possible to estimate the load-frequency and load-voltage characteristic constants. Necessary measuring periods and accuracies of estimation are clarified and the effectiveness of the proposed method is verified by simulation results.

著者

西川 尚男 菅原 俊一 栗原 塁 青木 努 小上 泰司

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.125, no.7, pp.680-686, 2005 (Released:2005-10-01)

参考文献数

20

被引用文献数

4 3

---

It is well known that the operation with low humidified reactants accelerates cell voltage loss of PEFC. On the other hand, the mechanism of the voltage loss is not clear. On this study, two kinds of cells which have different thickness membrane (15 and 30μm) were evaluated under operation with low humidified reactants to clarify the voltage loss mode. The study indicates that there are two different cell voltage loss modes. For 15μm cell (a thin membrane cell), the cell voltage decayed along with open circuit voltage decrease with H2 crossover increase. It is the case that H2 crossover depresses cell voltage. For 30μm cell (a thick membrane cell), the cell voltage decayed along with open circuit voltage decrease without H2 crossover increase. This decay mechanism of voltage loss without H2 crossover was focused to study. New methods for measuring humidity distribution and current distribution in a cell were introduced for further analyze. It is found that effective catalyst area loss in cathode catalyst layer could depress cell voltage.

著者

一ノ瀬 貴士 浅見 隆 木村 隆幸

出版者

The Institute of Electrical Engineers of Japan

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.114, no.7-8, pp.715-722, 1994-07-20 (Released:2008-12-19)

参考文献数

2

被引用文献数

1 2

---

When a grid fails to be supplied with electric power, a photovoltaic generation system connected to the grid may possibly start islanding. Therefore, the photovoltaic generation system needs to have a protective equipment for detecting not only fault of the grid and the system but also islanding of the system. This paper describes the protective equipment that prevents the photovoltaic generation system connected to the grid from starting islanding. It does so by detecting (1) a periodical frequency variation of voltage caused at the connection by output of a reactive power variation of a photovoltaic inverter and (2) a rapid change of harmonic voltage caused by exciting characteristics of a pole transformer.

著者

垣本 直人 林 文杉 林 宗明

出版者

The Institute of Electrical Engineers of Japan

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.110, no.6, pp.495-503, 1990-06-20 (Released:2008-12-19)

参考文献数

8

---

In this paper, an expert system was developed for initial stage restoration of EHV power system from system blackout. The operations to be done in case of blackout, are usually determined at every electric station by operation rules, and the power system is restored to the prefault state by carrying out the determined operations at each electric station. In case a regular operation should not work well, several supplementary operations are prepared. This method has some merits that it can restore along normal operation state, that its logic is simple, etc. Because of these merits, a part of the operation rules have been automated by automatic restoration equipments, but in case of system blackout, such human judgements as to secure initial power source are required, and operations by commands from a load-dispatching office become dominant. In this paper, an outline of restoration process was firstly clarified through analysis of the operation rules. Next, the operation rules were transformed into production rules, and were put in order at every electric station. An individual knowledge base was prepared for each group of electric stations in construction of the expert system, and a proper order was introduced in choosing a station to be restored, by which vain search of rules was eliminated. The expert system was applied to a model power system, and it was shown that the computation time for generating all restoration operations is about 0.5s, and that the system can deal with cases where there are some damaged equipments.

著者

佐々木 鉄於 小山 泰史

出版者

The Institute of Electrical Engineers of Japan

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.121, no.4, pp.559-569, 2001-04-01 (Released:2008-12-19)

参考文献数

4

---

We study the voltage stiffness effect for cascading tripping and its protection in power systems. This paper describes a new selective method of proper system separating point to prevent from system failure extension to wide area. We define “the voltage stiffness” by short circuit capacity and line impedance, and explain an operation to select proper separation point. In addition, we consider the security after system separations. It is dominated by both increase of reactive power transmission losses and margin of reactive power supply of generator. The basic 4 power system structures are also considered in this paper. The topological analysis of power system can show the best system structure in both power interchange and cascading trip protection. We apply the proposed method to practical power systems and simulate power system faults. Simulation results show that separating system at the selected point can defend cascading tripping.

著者

大槻 博司 横山 明彦 関根 泰次

出版者

The Institute of Electrical Engineers of Japan

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.112, no.7, pp.615-621, 1992-07-20 (Released:2008-12-19)

参考文献数

9

被引用文献数

1

---

Voltage instability is now under intensive study in Japan. It is very important to make clear the mechanisms of voltage collapse for the purpose of establishing the countermeasures.Voltage instability depends greatly on the dynamic characteristics of load and dynamic digital simulations are mainly adopted to analyze the dynamic phenomena of voltage collapse. In order to analyze the dynamic voltage stability, however, eigenvalue method has been already proposed by the authors, which requires a long computing time. In this paper, a simple method using “short-term P-Vcurves” is presented. It make it possible to show the power supply capability at any load nodes.A radial power system with 3 induction motors is analyzed and stability transition during voltage collapse is made clear. This phenomenon is useful for explaining the cascaded voltage collapse well.

著者

道上 勉 鬼塚 長徳 北村 哲

出版者

The Institute of Electrical Engineers of Japan

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.110, no.11, pp.887-894, 1990-11-20 (Released:2008-12-19)

参考文献数

5

---

The previous generator excitation control system is based on AVR control of generator terminal voltage. This system can't accommodate reactive power up to the facility limit even when the power system voltage decreases to the limit for stable operation. We attempted to develop advanced excitation control system (PSVR) to achieve higher constant sending end voltage of power station. We intended to apply the system to the generator connected to a 500kV system which contributes most effectively to the voltage stability of a bulk power transmission system. This PSVR produces higher control gains than the AVR, the following functions were adopted: (1) AVR gain reduction circuit, (2) phase compensation circuit, and (3) damping improvement by enlarging the limiter of the PSS. In addition, various functions were provided. These include voltage slope characteristics to balance the reactive power of adjacent generators and PSVR output and terminal voltage limiter to stabilize the generator operation. Previously to an application to a real system, a transient response test was performed by combining PSVR and generator simulator to verify the damping improvement and stability of the voltage control.

著者

田村 淳二 上野 昌裕 米岡 智 上田 善之

出版者

The Institute of Electrical Engineers of Japan

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.120, no.12, pp.1636-1645, 2000-12-01 (Released:2008-12-19)

参考文献数

16

被引用文献数

2 5

---

Recently the wind power generation has attracted special interest and many wind power stations are being in service in world. In the wind power stations, induction machines are mostly used as a generator. Since induction machines also have a stabi problem like the transient stability of synchronous machines, it is important to analyze the transient stability of power system includ wind power stations. This paper presents a model of induction generators, develops methods of power flow calculation and transi stability simulation of power system including induction generators, and presents considerations on the characteristics of transi stability of induction generators on the basis of numerical simulations.

著者

松尾 豊 横山 明彦

出版者

The Institute of Electrical Engineers of Japan

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.120, no.8-9, pp.1061-1070, 2000-08-01 (Released:2008-12-19)

参考文献数

6

被引用文献数

2

---

FACTS devices such as high-speed phase shifter and variable series capacitor enable us to control active power flow in order to avoid thermal constraints on transmission lines, resulting in an increase of the network loadability and a reduction of production cost. However where to place these devices is an essential matter because their effects considerably depend on the locations. From an economic point of view, the investment cost must be taken into account as well as the reduction of the production cost. Therefore we propose to maximize return on investment (ROI) by searching not only the best location of FACTS devices but also the rating of each device. This problem is expressed as combinatorial optimization problem nested by nonlinear optimization problem. To solve this problem, tabu search incorporated with nonlinear programming method is used. And we discuss the remedial control of FACTS devices and simultaneous consideration of multiple load conditions. By considering remedial control, we can make better use of FACTS devices. Multiple load conditions bring us more appropriate solutions. Because the consideration makes our problem more difficult to solve, some efforts are necessary to be made. Numerical results are shown for a 3-generater 41-line model system and a 5-generator 42-line model sysytem.

著者

本橋 準 一ノ瀬 貴士 石川 忠夫 甲斐 隆章 金田 裕敏 石塚 隆司

出版者

The Institute of Electrical Engineers of Japan

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.119, no.1, pp.14-23, 1999-01-01 (Released:2008-12-19)

参考文献数

10

---

In recent years, enhancement of consciousness for energy saving and problem of environment are widely encouraging the installation of dispersed storage and generation (DSG) units such as co-generation and photo-voltaic generation. When a distribution line with the DSG is disconnected from the main source of utility, the DSG supplies power to the distribution line. The situation, namely islanding, creates various problems for the reliable and safe operation of the distribution line. Thus, the islanding must be immediately prevented by islanding protection equipment. This paper describes an islanding protection scheme and the digital protection equipment for a synchronous generator. The proposed scheme detects an islanding of a synchronous generator from frequency fluctuation occurred by feeding a sinusoidal small reference voltage signal into the auto voltage regulator circuit of the generator. The authors have manufactured the digital protection equipment applying the scheme, confirmed the excellent performance by testing in an artificial distribution line. In the paper, a determining proceeding of the setting value of the equipment is described.