Consultation system with contact person through on‐demand calling of a proper expert for a problem

Local branches of financial institutions offer to their customers a wide spectrum of advisory services which must be upgraded from time to time to keep up with changes in the mix of financial products offered and with the growing sophistication of the customers' inquiries. However, keeping the full staff of experts trained in various aspects of banking business is not practical from the standpoint of cost‐effectiveness, while without them it is difficult to provide high‐quality services. In this paper we propose a window consultation system for customers at the branch office using the on‐demand calling of an expert specializing in the subject related to the inquiry. The proposed system is based on the multimedia network technology and it has two main functions: selection of an on‐line expert and tele‐consultation providing the replies or expert advises to the inquiries. A customer visiting his branch office is interviewed by a clerk who determines the contents of the request and, if he is unable to give the customer satisfactory advice, contacts through the proposed system an appropriate expert. This system makes it possible to provide high‐quality services and to avoid mistakes, which can be made by customers if they operate the consultation systems on their own. The proposed system has a three‐layered structure: application component layer, middleware component layer, and fundamental component layer. This structure allows for an easy installation and modifications depending on the scale of specific branch offices of financial institutions and the mix of financial products offered by them. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 163(2): 57–66, 2008; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20518     

异步传输的分布式铁路10 kV电力监控系统

为解决提速铁路10 kV电力系统运行参数变化快、海量实时数据传输和处理困难的问题,设计研发了实时异步传输的电力远动监控系统.对铁路10 kV电力系统的运行、录波数据的远程传输和海量实时数据的处理进行了分析设计.提出了利用发布/订阅原理进行异步数据传输的模式,考虑到实时数据点多、变化快的特点.建立了实时数据交换的二级缓存...     

Determination of the optimal DR capacity for a commercial building with chiller system and energy storage system

Demand response (DR ), which is used to shave the peak demand for securing supply reliability in a power system, is one of the promising constitutions for the end users. In a commercial building (COB ), the most popular adjustable DR resource (DRR ) is the chiller system. More specifically, its power consumption can be reduced by thermal mass control (precooling) in a specified DR duration. On the other hand, installation of energy storage systems (ESSs ) is going on at an accelerated pace because of its high economic efficiency. ESSs have been used for peak‐shift operation under the time‐of‐use (TOU ) tariff. However, ESS can be also used as an attractive DRR because it can reduce the net load by discharging the ESS for a specified DR duration. Based on this background, this paper presents a method for determining the optimal DR capacity in a COB with a chiller system and ESS . In the proposed scheme, the optimal DR capacity (kW ) can be determined so that the total expected cost of a COB becomes minimum by using the chiller system and ESS while avoiding the DR penalty threat adopted in the Korean DR market. Uncertainty in the ambient temperature, the amount of reduction, and DR durations are considered as the scenarios. The estimation and economic evaluation of the proposed scheme is ascertained through case studies. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

On power tracking and alleviation by a new controller for fulfilment of the damping and performance requisites for a variable speed wind system: An optimal approach

This paper addresses a new control strategy for a variable wind energy conversion system. The proposed controller aims to regulate the output power tightly in response to the desired value changes and alleviate power oscillations against the disturbances, including wind speed variation and fluctuation of the voltage magnitude, as voltage sag and swell. For the sake of straightforward analysis, an effective and reduced representation for the wind system is developed. In addition to the proper performance, the controller seeks to adequately fulfilment the damping requirements, as though both damping and performance requisites are taken into account control policy. Consequently, the proposed approach focuses on optimal tuning based upon a performance index incorporated into linear quadratic (LQ) cost function, which is subjected to the performance constraints. To validate the controller role, multiple simulation tests are carried out including set point tracking, disturbance rejection against wind speed, voltage sag and swell. Simulation results verify the proposed method features a satisfactory performance and sufficient damping, meeting both aspirations of the power regulation and disturbance suppression.