无功就地补偿城工矿企业的应用

本文从工矿企业节电效果出发，论述了无功地补偿在工矿企业应用前景，结合工矿企业供配电的具体情况，提出以集中补偿和就地补偿霜结合的补偿方案，以提高供配电系统的供电质量，改善电动机的运行状态，节约电能和运转费用等。     

浅论工矿企业供配电系统的无功补偿

编者的话 :节能监测工作是节能工作的重要组成部分。多年来通过节能监测为各级节能主管部门提供了企业用能的科学数据和依法行政的根据 ;为企业的节能潜力挖掘指明了方向 ;为用能单位改进能源管理和节能措施的实施提供了科学依据 ,推动了全省的节能降耗工作的深入开展。为了使节能监测工作更好地展开 ,鼓励广大科技人员更加努力地学习钻研业务知识 ,江苏省计划与经济委员会开展了全省“节能监测优秀论文评选活动”,本刊为此开辟“节能监测”专栏 ,将陆续刊登入选的优秀论文 ,以飨读者     

浅谈无功补偿技术

本文通过对无功的产生,无功对设备的危害,无功补偿量的计算分析,进行合理经济的配置补偿设备,并阐述了不同的补偿方案,投资分析。     

无功补偿的分类及其应用

本文简要介绍无功补偿的分类与作用，就常用的无功就地补偿作了较深层次的分析，且以实例应用为背景。     

异步电动机无功就地补偿技术

推广无功率就地补偿，国外早在70年代就开始采用，目前美国，主西欧等工业发达国家普遍采用，本文就算其节电原理，如何计算就地补偿电容容量以及应注意的几个问题，提出了探讨性意见并举实例加以说明。     

工业企业无功补偿与节电

改善工业企业用电的功率因数是提高用电效率、节约电能的重要手段。本文通过理论分析和应用实例说明了工业企业无功补偿的意义和作用,并针对目前工业企业供用电系统存在的问题,提出了改进意见和措施。     

楼宇配电系统分相无功补偿与谐波抑制技术研究

通过对智能建筑电力、电子负荷的研究与分析,指出其负荷的主要特征及常见问题的解决办法。采用传统的单相采样、三相共补的无功集中补偿方式,因三相负荷的不平衡,易导致无功欠补偿或过补偿。为了避免这个问题,文中给出了无源滤波器与有源电力滤波器相结合的分相无功补偿方式,并通过计算机仿真结果验证其可行性。     

配电变压器无功功率的分析与节能措施

本文主要对配电变压器无功功率进行介绍和分析,然后通过具体实践中的应用,举例做定量分析来说明取得的节能效果,最后调整负载功率或电压等因素来达到节能省电的效果。     

Reactive power management and control of distant large-scale grid-connected offshore wind power farms

Reactive power management and control of distant large-scale offshore wind power farms connected to the grid through high-voltage alternating current (HVAC) transmission cable are presented in this paper. The choice of the transmission option is based on the capacity of the considered wind farm (WF) and the distance to the onshore grid connection point. The WF is made up of identical doubly-fed induction generators (DFIGs). Modelling and improved analysis of the effective reactive power capability of DFIGs as affected by various operational constraints are provided. In addition, modelling and analysis of the reactive power demands, balance, and control are presented. The minimum capacity and reactive power settings for reactive power compensation required for the system are determined. Possibility of unity power factor operation suggested by the German electricity association (VDEW) is investigated. A summary of the main outcomes of the work presented in this paper is provided in the conclusions section.     

Reactive power compensation and active filtering capability of WECS with DFIG without any over‐rating

This paper presents a novel approach for reactive power compensation and active filtering capability of a variable speed wind energy conversion system (WECS) with doubly fed induction generator (DFIG), without any over‐rating. First, the WECS is capable of capturing maximum wind power under fluctuating wind speed. Second, depending on the available wind power value versus nominal WECS power, power quality can be improved by compensating the reactive power and the grid harmonic currents, without any system over‐rating. The proposed rotor side converter (RSC) control manages the WECS function's priorities, between main active power generation and power quality management. To ensure high filtering performances, we used an improved harmonic isolator in the time domain, based on a selective pass band filter (SPBF) developed in our laboratory. Moreover, we took advantage of the high amplification effect of the rotor side‐controlled DFIG to compensate harmonic currents. Consequently, no over‐rating is necessary for the proposed additional active filtering capability. Simulation results for a 2 MW WECS with DFIG confirm the effectiveness and the performances of the proposed approach. Copyright © 2009 John Wiley & Sons, Ltd.     

Review and clustering of optimal energy management problem studies for industrial microgrids

The optimal energy management problem of microgrids is an agenda item for the energy field. Especially industrial microgrids, whose energy demand is high and uninterruptible, need to be managed by a holistic view of optimization. Technical researches in this field are to be enriched with the literature review that looks through various angles. In the scope of this paper, the research literature is reviewed deeply and analyzed with the aim of presenting the gaps. Articles written in English, in the period of 2010 to 2019 have been revised thoroughly. By eliminating the search results, 105 relevant articles have been determined. Objective(s), criteria for analysis, processes included, power source(s), storage system, other system components and methodology of each article have been studied. The literature has been summarized, it has been seen that solar, wind, and diesel sources are used in about 82%, 55%, and 16% of articles, respectively. Then, they have been clustered using self‐organizing maps. Nine clusters have been obtained which separate the articles clearly. Especially, three of them which have fewer data have been analyzed. Clustering results have been interpreted and utilized to show the research openings. Achievements of this study will lead the scientific research that will fill in the gaps.     

无功补偿及消谐装置在煤矿供电系统中的应用

就矿井供电系统方面的问题,从高次谐波对煤矿供电系统的危害入手,分析有源滤波治理无功补偿的有效作用,进而阐述无功补偿及消谐装置的应用效果,以期对矿井的供电系统工作做出有益思考。     

工业炉窑燃烧过程中节能减排问题的研究进展与发展方向

工业炉窑是建材、冶金、化工等流程工业中至关重要的用能装备,也是化石能源消耗和环境污染的主要源头之一.工业炉窑燃料中煤炭占70％,存在着能耗高排放大的问题,需要研发高能效低排放的新技术.对于典型的工业炉窑,其生产过程具有多工艺目标、多品种交叉生产,以及大负荷调节比、宽阈度负荷变化的复杂工艺特点.通过综述在节能管控、富氧燃...     

天然气与煤粉混烧技术在工业锅炉上的应用

介绍了在链条炉的基础上,以煤粉、天然气的悬浮燃烧方式配合火床燃烧的节能改造技术,对一台20t/h快装链条炉改造后,锅炉启动时升温速度提高,负荷调节的响应时间缩短,锅炉灰渣含碳量由原来的20％降低到5％以下,机械不完全燃烧损失大为降低.过量空气系数由改造前的2.5 ～3降低至1.2 ～1.3,大幅减少了锅炉排烟量,降低了锅炉排烟热损失.锅炉热效率由改造前的62％提高至改造后的77％ ～ 80％.     

Potential evaluation of power-to-hydrogen-to methane conversion technology in robust optimal energy management of a multi-energy industrial park

Multi-energy industrial parks are required to render a huge variety of services in an eco-friendly, secure, reliable, and affordable way. The industrial energy park is a separate area consisting of multiple distributed generations, energy storage systems, etc., which supply local gas, heating, and electrical consumers. Meanwhile, the integration of power-to-X technologies such as power-to-gas and power-to-heat, which convert the electricity into other forms of energies while facilitating the integration of renewable energy in the industrial park, can enhance the flexibility and efficiency of energy supply. Therefore, this paper proposes novel robust energy management of multi-energy industrial parks integrated with wind power resources, cogeneration units, power-to-X technologies, and demand response programs to total operation cost minimization. The industrial park can simultaneously participate in a multi-energy market, including power, thermal, and gas markets, to meet local heating, gas, and electrical load. The robust optimization framework is extended to address the power price uncertainty and manage the conservatism level of the operator against price variability. The proposed model is examined on the industrial park test system, and numerical results will be presented for the different cases. Under the robust energy management, the total operation cost of the multi-energy industrial park reduces up to 53 %.