一种新的模糊控制方法在感应加热电源中的仿真分析

常规感应加热电源的设计是基于形状和密度规则的金属加热,由于不规则加热金属在感应线圈行走速度相同,造成在同样的功率下加热金属出现温度不均匀的现象。提出了一种新的模糊控制方法,改变常规的模糊控制输入量,根据加热金属形状和密度的不同,实时调整功率的大小。在MATLAB中进行仿真,仿真证明该方法改善了常规模糊PID控制方法和以往感应加热电源设计的不足,具有有效性和广泛应用性。     

高频感应加热电源PLL—PSM复合控制电路研究

以移相脉宽调制电路和锁相环电路为基础,设计了一种新的电压源供电的串联感应加热负载的PLL—PSM混合控制电路。实验显示其能让逆变器工作在负载固有谐振频率处,同时逆变器能实现输出功率桥内调节。该电路简化了感应加热电源的拓扑结构,对负载具有好的自适应性。     

单闭环控制系统在IGBT中频感应加热电源中的应用

设计一种以CD4046与SG3525A构成的单闭环控制系统,采用PI调节方式对中频感应加热电源进行无相差频率跟踪,并就频率跟踪瞬态性能进行分析,利用闭环调节自动跟踪负载频率。将该系统用于100kW IGBT中频感应加热电源样机中,对电源效率进行数据统计分析,并且与同等级可控硅中频感应加热电源相比较,电效率得到大幅度提高。     

提高感应加热电源加热效率的一种方法

提出了在中频感应加热电源整流控制电路中采用功率，电压双闭环控制策略，实现感应加热过程的恒功率调节，可有效地提高感应加热电源的加热效率。     

大功率电磁热储能系统感应加热仿真研究

本文以24k Hz/100k W的电磁热储能系统为研究对象,系统采用电磁感应加热的方式,将由新能源发电系统产生的清洁电能转化成为热能,并将这些热能加以利用或者存储在水中。首先应用Ansoft-Maxwell对感应加热模型进行涡流场仿真分析得到磁场分布,利用得到的磁感应强度计算流体场热源。然后应用Ansys/Fluent对感应加热模型进行三维流体温度场仿真分析。感应加热系统的电源设计在电磁热储能系统中有着至关重要的地位,应用Matlab/Simulink对感应加热电源串联谐振电路进行建模仿真分析,得到谐振状态下的电路特性曲线,给出了PLL锁相环信号、PWM全桥逆变触发信号等波形,为电磁热储能系统的感应加热电源的研究和开发提供了一定理论依据。     

电力电子技术的发展给感应加热电源带来的机遇和挑战

结合电力电子技术和感应加热电源的发展现状,分析了电力电子技术的发展给感应加热电源研究带来的机遇,总结了目前感应加热电源发展中所面临的巨大挑战,进而提出感应加热电源伴随着电力电子技术发展的趋势。     

感应加热装置的发展动向

感应加热在工业上的应用已有80年的历史。近年来,以IGBT,MOS—FET为代表的电力电子半导体元器件的迅猛发展大大促进了感应加热电源设备的更新换代与技术进步,感应加热电源装置日趋大功率、高频化。热处理用感应加热装置正在向小型、低成本化和复数分散配置的方向发展。围绕感应加热装置的大功率、高效率、长寿命、小型化、低成本、区域加热控制、双频加热、低能耗、少无公害等新技术的研究开发,概述了感应加热设备的发展动向。     

变频电源扩大了感应加热淬火的应用范围

文章首先一般介绍了感应加热的特点以及频率、功率密度和淬火前工件的状态对感应淬火的影响,接着详细介绍了变频电源在为轴颈轴承、卡车车轴、齿轮、工具钢工件、不规则形状工件淬火和石油及天然气井管的淬火应用     

感应加热电源在注塑机料筒加热上的应用研究

介绍感应加热电源在注塑机料筒加热上的应用,设计一种半桥式串联谐振电路拓扑结构的电磁感应加热电源,通过在一个内直径40mm、外直径100mm的注塑机料筒上实验,得出谐振电容和谐振电感参数的变化与电源输出功率之间的关系。设计1台样机,实验结果表明该电源工作稳定可靠,对进一步研究具有一定的参考价值。     

高频感应加热电源的数字化研究

为了使功率器件工作在零电压开关(ZVS)状态下,以提高串联谐振式逆变器的输出效率,需要使逆变器的工作频率始终与负载的谐振频率保持同步.介绍了一种基于DSP的数字化高频感应加热电源的设计方案,该电源采用TMS320L F2407A作为控制芯片,通过一种改进的数字锁相环控制策略,采用频率校正和相位校正以实现对电源的输出频率进行实时控制,实验证明此方法设计的逆变电源具有良好的频率跟踪特性,具有一定的应用前景.     

电热膜加热技术在集油系统中的应用研究

对电热膜发热机理及发热特性进行了理论及试验研究,筛选出了适合于油田集油工艺特点要求的金属箔电热膜,并据此研制成功了电热膜井口加热装置。根据对电热膜加热集油流程进行的可行性分析,确定了改造方案,并在一个计量间所属的10口油井进行了试验。实际应用表明,以电热膜加热流程取代双管伴热流程,节能及经济效益显著。     

Erratum to “Metal hydride based heating and cooling systems: A review” [International Journal of Hydrogen Energy (2010) 35: 3817–3831]

Dry (solid) sorption systems are attractive competitors to wet (liquid) sorption systems in providing useful cold and/or useful heat. Among the dry sorption systems, those based on the absorption/desorption of hydrogen in/from metal alloys reveal advantageous features, and this has stirred up the interest of researchers already since the 1970s. In recent years, many attempts have been made to develop metal hydride based heating and cooling systems. Of special interest was and is the possibility to utilize low temperature heat (waste heat, solar heat) to drive those systems. Major applications are seen in air-conditioning and heat supply for buildings and in air-conditioning of automobiles. In this paper, the research and development work on metal hydride based heating and cooling systems is reviewed which has been published in the last three decades. Emphasis is given primarily to cooling/air-conditioning. The objectives are to provide the fundamental understanding of metal hydride based heating and cooling systems and to give useful guidelines regarding various design parameters. The operating principles of various types of systems are explained and the importance of the metal hydride reaction bed heat and mass transfer characteristics is stressed. Possible ways for improving the coefficient of performance and specific cooling capacity are discussed. Besides a brief characterization of many experimental and theoretical investigations, the worldwide status of the development of metal hydride based heating and cooling systems is summarized in a tabular form.     

Metal hydride based heating and cooling systems: A review

Dry (solid) sorption systems are attractive competitors to wet (liquid) sorption systems in providing useful cold and/or useful heat. Among the dry sorption systems, those based on the absorption/desorption of hydrogen in/from metal alloys reveal advantageous features, and this has stirred up the interest of researchers already since the 1970s. In recent years, many attempts have been made to develop metal hydride based heating and cooling systems. Of special interest was and is the possibility to utilize low temperature heat (waste heat, solar heat) to drive those systems. Major applications are seen in air-conditioning and heat supply for buildings and in air-conditioning of automobiles. In this paper, the research and development work on metal hydride based heating and cooling systems is reviewed which has been published in the last three decades. Emphasis is given primarily to cooling/air-conditioning. The objectives are to provide the fundamental understanding of metal hydride based heating and cooling systems and to give useful guidelines regarding various design parameters. The operation principles of various types of systems are explained and the importance of the metal hydride reaction bed heat and mass transfer characteristics is stressed. Possible ways for improving the coefficient of performance and specific cooling capacity are discussed. Besides a brief characterization of many experimental and theoretical investigations, the worldwide status of the development of metal hydride based heating and cooling systems is summarized in a tabular form.     

一种基于T-S模型的模糊PID控制器的设计及应用研究

基于Tзkзgi和Sugeno的模糊控制模型，设计了一种基于T-S模型的模糊PID控制器，这种设计方法可以充分借鉴常规PID控制器参数调整的各种成熟经验，使模糊控制规则的制定和参数的调整更简单易行，且物理意义明确。通过对电加热炉的仿真和实时控制表明，该控制器有着很强的适应性和鲁棒性，改善了系统的动静态性能。     

邻炉高温风加热技术的应用

在调峰锅炉起动前，提高炉内各设备部件金属的温度，对点火初期煤粉的迅速稳定着火燃烧具有非常特殊的作用。加装邻炉高温风现循环管，完善了邻炉高温风加热系统，从而保证了在起动过程中能连续使用邻炉高温风，使加燃系统更完善合理。     

风力机直驱蒸汽压缩式热泵系统实验研究

从现有风能直驱式热泵系统存在的突出问题入手,利用软连接管路突破了风能直驱热泵系统硬连接的瓶颈问题,提出新型风力机直驱蒸汽压缩式热泵系统,并对该系统进行了实验研究。实验结果表明,热泵机组制热量随压缩机转速呈近似线性规律,热泵机组COP随转速呈近似指数变化规律,机组存在最佳转速;金属软管阻力损失对制冷剂焓值影响可以忽略,但是对冷凝温度有较显著影响,如需要保证热水温度,则需要提高冷凝压力,相应COP会降低,机组运行稳定,初步证明系统可行。     

Unglazed solar wall air heaters

The new unglazed wall mounted solar air heating panels have become the preferred method of heating air using solar energy in cold climates. Since 1989 numerous systems have been installed on a wide range of applications and in several countries. Monitoring work under IEA Task 14 on a few of the solar wall heating systems has revealed interesting results and that the unglazed panels outperform the traditional glazed solar panels and at lower capital costs. The panels which have the trade name SOLARWALL® are built from conventional building cladding material, look like a typical metal wall and can be any dark colour. This paper will summarize some of the work to date, examples of applications, monitoring results, new developments and provide insight as to why this technology has the potential to revolutionize building construction in the future.     

Research and development by British Gas into the effective use of gas in industry

The work of the British Gas, Midlands Research Station in promoting the efficient, safe and environmentally beneficient use of gas in industry is reviewed.Because natural gas flames are essentially non-luminous special consideration has been given to the design of injectors and burners which promote high convective heat transfer. The way in which these burners can be utilized to achieve even and efficient heating in existing and new furnaces is described. Particular attention is paid to the evolution of compact rapid heating furnaces suitable for metal reheating prior to rolling, pressing, forging or extrusion.While the work of the Gas Industry has long been directed towards an examination of those factors that lead to higher efficiency in use, the present exhortations to use gas wisely have intensified this approach. As a result a variety of new developments including recuperative burners, rapid heating furnaces, high intensity small bore immersion tubes for heating aqueous liquids in vats and tanks, and gas fuelled prime movers, have emerged as effective ways of reducing fuel consumption and in some cases making other resource savings. The design, operation and savings achieved by these devices are reported.The remarkably good record of the Gas Industry in respect of safety has been obtained as a result of close liaison between the supply industry, equipment and component manufacturers and customers. The contribution made by the Midlands Research Station is outlined in this paper. In this context the progres made in designing explosion reliefs, devising standards and codes of practice for automatic burners, and in determining the most suitable criteria for achieving safe energy releases during ignition is discussed.The work on environmental protection described, shows that there are very few problems either in respect of atmospheric pollution by combustion products or by noise. In considering the environmental effects of combustion products attention has been paid both to indoor and outdoor atmospheres. The work on noise includes both fundamental studies of resonance and broadband noise and the more practical aspects of technical service activities.The work described in this paper highlights the important milestones in British Gas Research over the past two decades.     

新型低温辐射金属电热膜的开发和应用

低温辐射电热膜是一种新型的环保采暖材料,针对目前低温辐射金属电热膜产品复合不牢、性能不稳定、安装性差的缺点,对其制造的关键技术进行了研究和试验,提出了各生产工序的技术要点,完善了生产工艺流程.通过对研制的新型低温辐射金属电热膜进行现场测试,各项指标符合技术要求,室内温度达到暖通规范要求.