On the basis of various modeling methods and improved thought of electric arc furnace V-I characteristic curve fitting method,a detailed modeling project for the practical DC electric arc furnace system is advanced.In the light of field situation,a DC electric arc furnace model has been established.To verify the model precision,the simulation analysis of this arc furnace system is carried out.The results show that the established model simulates well operation of the actual arc furnace system.And the model error rate can be kept 5% or so.Thus the modeling project is effective.

The concept that Smart grid is the future direction of power grid has been a broad consensus around the world.It is of great significance for building the smart power supply and distribution network in iron steel enterprise based on the research of smart grid.This paper describes the development of smart power network and its characteristics,and according to the specific characteristics and needs of steel companies on the smart grid,a preliminary discussion and analysis is provided.

Power quality has important significance on stable running of iron and steel enterprises.As a key issue in power quality,voltage dropping issue is increasingly to be concerned.Since 2005,there are many voltage dropping accidents caused by external power grid failures in Baoshan Iron & Steel Co.,Ltd.From the practice of Baoshan Iron & Steel Co.,Ltd,the related issues about the voltage dropping are analyzed and discussed and some measures to prevent the voltage dropping are given.

In the light of fitting process of electric arc V-I characteristic curve, an improved thought was raised.A modeling scheme and modeling methods for the practical AC arc furnace system were put forward.Simulating analysis of the AC arc furnace system was carried out.The simulation results demonstrated the validity of this modeling scheme.Error rate of the model was about 4%.Moreover, a simulating analysis is carried out using MATLAB software.

Reactive power compensation is an important general power saving application to improve the power factor and reduce electricity load power loss. Reactive power compensation technology applied in Baosteel second material substation is mainly discussed and analyzed, and energy-saving benefits are calculated, which have important reference meanings for power substation reactive power compensation problems in the similar industrial enterprises.

The stability state of the distribution system in operation alone (After it was separated from Shanghai electric grid) in the first phase distribution system or in the third phase distribution system,and the stability state of system in operation alone were presented as the first phase distribution system was connected with the third phase distribution system. The stability of the distribution system of Baoshan Iron Steel Co.,Ltd in operation alone was studied.

Although the distribution transformer has high energy conversion efficiency, the number of the transformer is large in power supply and distribution network with a larger energy conservation space. This paper analyzes the eliminating and updating of distribution transformers in Baosteel and the status quo distribution transformers. The specific issues were discussed about the eliminating and updating of distribution transformers in the company. The analysis has important reference value for similar high consumption transformer business.

Electricity utilization characteristics of large heavy industry enterprises were analyzed.It found out that the longer the troubleshooting time was,the less the daily electricity consumption was;the larger the output was,the more the daily electricity consumption was.Taking the above as the structure information of problems,a forecasting method based on non-negative least square was set forward.Taking troubleshooting scheme and output scheme of the enterprises as input information,this method structured regression function and introduced the structure information of problems into construction of a model.It greatly increased precision of prediction and generalization capacity of the model.

In China, large-scale industrial enterprises as well as its power supply and distribution networks usually are constructed by stages in several years. For this reason, there are many types of transformers with different energy consumption, and some of them need to be renovated combining the situation of energy and environmental protection at present. In this paper, discussion is done for the replacement of transforms based on the introduction and analysis of the development of transformer and its status in big industrial enterprises are introduced.

The situation of electric power shortage and tariff rise makes iron and steel industries face greater challenges. This paper introduces the electricity consumption situation of iron and steel industries. Power saving and efficiency improvement can be realized by adjusting production structure and demand control technology, improving the process, optimizing the power grid structure, and using green illumination.

The modeling method of dc & ac arc furnaces are proposed.Basic princibles the method of modeling in dc & ac are furnaces for metallurgy corporation,gived a special modeling be response to the demand for running and modeling of arc furnaces.

The detailed investigation and classification were carried out on the current arc furnace models.And various kinds of typical model plans were analyzed and estimated fully and accurately.It pointed out that the time domain voltage source model was an effective one in the numerous models.Furthermore,it put forward some practical measures for the follow-up research of the model in future.

介绍了现代化企业能源管理的特点,开发了包括企业生产流程、技术特点、创新点、主要节能措施和环保技术为主要内容的多媒体能源生产管理综合信息系统.该系统包括能源中心综述篇和以详尽技术资料为主的能源中心专业篇两部分,其中前者有中、英文两种版本.系统采用Authorware作为主要开发平台,使用Access作为数据信息库开发工具,数据信息库与Authorware之间的接口通过ODBC技术来实现,极大地方便了用户对数据系统的更新.此外,本文还对系统开发的设计思想、开发特点和实施方法、应用领域等进行了详尽介绍.

2003年8月美加的重大停电事故反映了北美电网的规划、建设、管理和调度等方面存在突出问题.对照宝钢电网用电负荷的不断增长,原来较为稳定可靠的电网也出现一些薄弱环节,存在大面积停电的隐患.为此,对有关的安全可靠问题作了进一步探讨,提出了调整完善其供电系统的对策.

概略介绍了宝钢供配电系统继电保护装置的配置和整定情况,着重分析了供配电系统中不同结线方式的过电流保护动作值整定和上下级配合的关系,指出了存在的问题,提出了改进建议.