As for the electric wire, the cable for the power supply of our country, it is provided equipment under the a great variety of environment, and, as for the insulation electric wire, the cable for the supply of electric power, it is enormous facilities quantity, and various malfunction phenomena occur among other things in the late years. In Institute of Electrical Engineers of Japan “committee (from January, 2015 to December, 2016) for the supply of electric power specialized in the actual situation and a problem investigation into diagnosis, evaluation technique in an insulation electric wire, the cable”, I investigate a diagnosis, an evaluation method and the technique trend in each process before the production of an insulation electric wire, the cable reaching the recycling and explain it about the contents of the technical report to gather in this investigation specialty committee.

Numerical analyses for beam dynamics in a compact simulator constructed by an electron beam device are carried out in space-charge-dominated regime for heavy-ion beam driven inertial confinement fusion. In strong space-charge-dominated regime, it is expected that fine structures of the charge distribution of the beam bunch are canceled, and the beam current waveform becomes smooth, because of the repulsion force due to the space charge effect. However, the numerical simulation results indicated that the fine noisy error of the voltage applied at the gap is obstinate in the phase space for this study.

This paper proposes a study of the distribution line feeder voltage control method by the combination of power factor control method by the combination of the power factor control and the interconnection between the feeders. The proposed system is composed of two layers and consists of three types of agent: single feeder agent (F_AG) and feeder-group agent (FG_AG), and bus agent (B_AG). At first, F_AG carries out a self-contained voltage control in the feeder, then FG_AG tries to interconnect between the feeders. The voltage control strategies are implemented as the class definition of Java into the system. In order to verify the performance of the proposed method, it has been applied to a distribution model system. The simulation results show that the system is able to control the voltage to make effective use of the distributed generations. In addition, by changing the system configuration, it shows a possibility of reducing the amount of the power factor control.

In resent years, because of increasing residential photovoltaic systems, voltage unbalance is being caused in distribution systems. It might be difficult to control voltage with allowable range using equipment such as Step Voltage Regulators and Load Ratio control Transformers. Therefore, it is important to suppress voltage unbalance. The method of voltage unbalance suppression using single-phase static capacitors (SCs) was proposed, and the effectiveness of the method was confirmed through experiments carried out on low voltage systems.

In this study, the authors propose the method of distribution line impedance estimation to prevent wrong control when distribution line impedance is changed. And we verify effect of the method by experiments with real-time simulator.

High penetration of renewable generation systems will lead to supply-demand imbalances, and will also require output curtailment of renewable power plants. We focused on management of electric vehicle fleet charging which can promote charging during specific time zone for reducing this curtailment. In this study, we evaluated the Charging Promoting Potential (CPP) of passenger EVs using optimization model based on the mixed integer linear programming. In addition, we also evaluated the CPP of other EVs, such as electric buses and electric trucks. We found that wider zone of the charging promoting time led effective concentration of charging load. Further, we found that the CPP of the electric buses is higher than those of the passenger EVs and electric trucks.

Demand response (DR) is a key technology for the smart grid, and to manage and optimize DR of energy consumers, accurate prediction of DR potential in each energy consumers is required. In this paper we focus on building and its facilities as the target of DR, and propose a general physical energy modeling procedure to estimate the DR potentials. First an energy model based on the thermal load model is estimated from restricted basic information of the target building. Then the model parameter, especially performance of HVAC facilities, is adjusted by decomposition of modeling error caused by operation and structure of the building. The modeling procedure is applied to an actual building, and the estimation of DR potential is compared with actual DR experiment.

This paper presents the application of multi-objective optimization methods for Network expansion planning. According to the electricity liberalization in fiscal year 2016, a suitable distribution method for both supply and demand selection is desired. Therefore, the distribution network expansion planning was studied in this research. In recent research, Controlled NSGA-Ⅱmethod regarding to the linkage distinction method using count box was being considered. This study proposes the same idea with an improvement to the method. It is also expected for an outcome which preserves the individual that supposed to be destroyed along the calculation process and also, necessary for wide solution.

In many countries, past large-scale blackouts were caused by voltage instability phenomenon and it is of prime importance to enhance the voltage stability in order to realize stable power supply. This paper presents a methodology to increase loading margin (LM) in terms of voltage stability by using reactive power support of distributed generation (DG), in particular photovoltaic, considering the operating limits of power system components such as generators. The proposed method is based on optimal active and reactive power dispatch from DGs under normal and contingency conditions. Here, a trade-off relationship between reactive power injection and active power curtailment was carefully considered in optimizing the DG's contributions. The proposed method is based on Particle Swarm Optimization and its effectiveness was verified in Malaysian Electric Power System model along with constant power loads. It was observed through simulation results that optimal reactive power injection from DGs improved the maximum loading under the voltage stability constraint.

In recent years, the breakdown accidents of Oil filled cables (OF cables) are occurring across the country. In TEPCO breakdown accidents occurred in a 275kV terminal joint and in a 154kV cable. OF cables have high reliability, so it has been thought that it is not deteriorated unless it is used in operation voltages and over atmospheric pressure. The cause of two breakdown accidents was estimated electric charging degradation with the copper compound by the findings of the breakdown removal product. We devised electric charging degradation mechanism under the operation electric field from these phenomena. By this mechanism, copper of the conductor is eluted into insulating oil as a compound and is deposited in the specific place. Then the copper compound occurs a partial electric discharge and wakes up destruction before long. Even if OF cables are used under the operation electric field, there is a possibility that degradation is progressed by this mechanism.