水轮发电机增容改造

为更好地利用水力资源,提高发电厂的经济效益,水轮发电机增容改造事宜提上日程。本文介绍了水轮发电机增容改造原因、途径以及增容改造的优点。通过增容改造,可降低水轮发电机事故率,提升电机经济效益。     

国产300MWe双水内冷发电机增容技术研究与应用

通过分析早期国产300MWe双水内冷发电机的设备状况,阐述了发电机进行增容改造的必要性,介绍了发电机增容改造的范围和实施方案,同时总结了发电机改造后发生的问题及处理方法,提出了具体的对策和建议,对今后汽轮发电机技术改造具有借鉴意义.     

600MW汽轮发电机氢气冷却器增容技术改造

针对一台600MW发电机在运行中出现的问题进行了分析,提出对该发电机氢气冷却器增容改造的必要性和可行性,比较了改造前后发电机及其氢气冷却器的各项性能参数。实际结果表明:增容改造后发电机能安全稳定运行。     

水轮发电机的增容改造分析

本文介绍了水轮发电机增容改造的几项常见技术措施,并以实例进行了水轮发电机的增容改造分析。     

660MW汽轮发电机增容改造方案

以某电厂660MW汽轮发电机为例,介绍了对大型水氢冷汽轮发电机增容前进行的状态分析,研究了增容的限制因素,给出了不同的增容改造方案,为大型水氢冷汽轮发电机的增容改造提供一定的参考。     

汽轮发电机定子增容改造的分析

文章简要介绍了发电机增容改造工程的概况.基于对限制发电机容量因素的讨论,主要对发电机定子部分在增容改造过程中所需解决的问题和采用的相应技术措施进行分析.     

水轮发电机的增容改造分析

介绍了水轮发电机增容改造的几项常见技术措施，并以实例进行了水轮发电机的增容改造分析。     

国产200MW发电机增容技术改造

在对徐州发电厂200MW发电机增容改造方案的可行性进行评估的基础上,介绍增容改造采取的主要措施.改造后所进行的温升试验表明,温升正常,发电机额定有功功率由200MW增容到220MW,发电机运行稳定,改造是成功的.     

某发电公司1号水轮发电机增容改造设计

广东粤电枫树坝发电有限责任公司1号水轮发电机由于运行时间长,出现了铁心老化过热的现象,已不能满足水轮机增容改造后的出力要求,故决定对1号水轮发电机进行增容改造,将容量由80 MW增至100 MW.为此,对增容改造设计中几个关键点进行了阐述,改造后运行测试数据表明,发电机的改造是成功的.     

张家口发电厂2号发电机增容改造技术

对300 MW汽轮发电机的增容改造的过程、发电机增容前后试验进行了介绍.     

风电机组的雷击机理与防雷技术

随着风电机组单机容量和风电场规模的增大，风电场的安全运行问题日益受到重视。在影响风电场安全运行的诸多因素中，遭受雷击是一个重要方面。本文结合风电机组防雷的研究成果，对风电机组的雷击过程、雷击损坏机理以及防雷措施进行了较全面的阐述。     

市场环境下评估AGC机组参与辅助服务方法研究

我国电力市场初期,AGC机组的选择和考核补偿两大问题亟待解决。基于层次分析法(AHP-AnalyticHierarchyProcess)提出一种综合评估AGC机组的方法。讨论了AGC机组提供辅助服务的特点,并以AGC机组容量价格、电量价格、调节容量、调节速度4个指标为例说明了利用AHP综合评估AGC算法的实施方法。该方法用于在市场环境下选择性价比高的AGC机组运行,根据考核评估结果补偿AGC机组,提出2种补偿算法,构造出一套完整的评估补偿机制。算例说明该机制能鼓励发电商报低成本,积极提供性能优良的AGC机组,促进调节性能差的AGC机组进行技术改造。该算法灵活、简便,具有实用价值。     

水轮发电机通风系统的相似方法与通风改造

以实测数据为基础，通过系统归纳，总结出水轮发电机通风系统的各种规律性系数，以及相似电机之间的内丰联系。通过对水轮发电机通风系统进行综合分析，研究不同通风结构所产生的不同效果，根据不同电机存在的不同问题，提出具体的通风改造方案，同时为大型水轮发电机的通风设计提供依据。     

丹江水电厂3号发电机通风系统改造

温度是发电机安全运行最主要的技术指标之一，它的高低将直接影响发电机绝缘及其考命，现在许多电厂都普遍存在发电机温度过高(特别在夏季)的问题。为了保证发电机安全运行，发挥最大效益，对发电机通风系统进行改造势在必行。丹江电厂对其3号发电机原有通风系统进行的改造，从改造后的效果看，降温十分明显。     

放大气隙(δ)等解决电机振动一例

验算并分析了电机振动产生的原因，通过电机的改造和试验，得出采用放大气隙等措施是解决电机振动的可行方案。     

UPS与其前级电源之间容量关系的探讨

文章推导了UPS与其前级电源之间的容量关系公式,并对柴油发电机,变压器和断路器等状态的容量进行了计算。对于合理选择这些设备给出了简洁的方案,很值得借鉴。     

A study of autonomous reactive power control method for distributed power generators to maintain power quality of the grid

Distributed power generators, such as cogenerators and renewable energy systems, have continued to advance and their penetration capacity is increasing. However, they may cause power quality problems in voltage regulation because of the reverse power flow. At present, when the distribution line voltage exceeds the limit value, distributed generators control reactive power to reduce the voltage, and if the reactive power output is not enough, they reduce the active power output. Therefore, an imbalance of active power output between distributed generators may occur because the voltage of generators varies by location and generators at lower voltage locations do not control the reactive power. A power control method for distributed generators needs to be established to solve these problems. In this study, an autonomous reactive power control method of sharing reactive power between distributed generators is proposed. The availability of this method is discussed experimentally and its applicability area is considered analytically by use of a model distribution system. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Influence of quadrature‐axis reactance of large turbine generator on operation

Two‐pole large generators are extensively used in power utilities. Growing demand for electric power in recent years has led to substantial increases in the capacity of generators. In line with this trend, our company has manufactured two‐pole turbine generators in the 900,000‐kVA to 1,200,000‐kVA classes. As the capacity of generators becomes larger, equivalent circuits are increasingly expected to improve their precision in estimating operation characteristics. The Park model has been widely used as an equivalent circuit model. The Park model with quadrature axis transient reactance $x_{q}^{\prime}$ is claimed to be useful for accurately estimating the load rejection characteristics of turbine generators. However, it is difficult to measure $x_{q}^{\prime}$, few studies based on measured data have appeared. As one of the few examples, we have conducted a measured data on a 500,000‐kVA‐class generator. Recently, the authors obtained test data on $x_{q}^{\prime}$ of a 900,000‐kVA‐class generator. In this study, based on these data, we studied the effect of $x_{q}^{\prime}$ using the finite element method and a transient analysis program (EMTP‐ATP). © 2011 Wiley Periodicals, Inc. Electr Eng Jpn, 177(3): 17–27, 2011; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.21099     

Interconnection protection of IPP generators atcommercial/industrial facilities

Much of the new generation capacity installed during the next millennium will be accomplished through the construction of independent power producer (IPP) generating facilities. These facilities can take the form of small dispersed generating units, or large-capacity plants owned and even operated by nonutility personnel. It is forecasted that many of these dispersed generating units will be at smaller industrial and commercial facilities and operating in parallel with the utility system to reduce energy cost through load sharing or “peak shaving.” This paper discusses the protection requirements to interconnect these generators to utility systems, as well as methods to reconnect these generators after interconnect protection tripping     

国产QFS型300 MW汽轮发电机增容改造的工程实践

为使发电机与改造后的汽轮机容量相匹配，华电国际邹县发电厂对300MW双水内冷(QFS)发电机进行了增容改造，进行了定子绕组端部模态试验、发电机最大负荷温升试验、发电机进相运行试验、发电机损耗及效率试验等性能试验。解决了QFS型发电机原有的一些问题，如因结构原因端部漏磁较大、定子端部压圈局部温度较高、不具备进相运行能力和发电机效率低等。改造后发电机运行可靠，功率由300MW提高到335MW，提高了11．67％，经济性和调峰性能均有显提高，为类似发电机的改造提供了经验。