共查询到17条相似文献,搜索用时 234 毫秒
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针对现有变压器经济运行分析软件和在线自动投切装置存在的问题,提出了基于动态规划法的变压器经济运行在线决策算法,进而结合实际需求开发了变压器经济运行在线决策系统,通过对某220kV变电站进行变压器经济运行在线决策分析,验证了所开发系统的实用性和有效性。 相似文献
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本文通过计算分析举例说明 ,寻求在装有备用变压器的配电网中 ,如何合理地投切配电变压器 ,实现变压器的经济运行 相似文献
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配电变压器节能运行方式的探讨 总被引:1,自引:0,他引:1
李红生 《福建能源开发与节约》2002,(3):21-22
本文通过计算分析举例说明,寻求在装有备用变压器的配电网中,如何合理地投切配电变压器,实现变压器的经济运行。 相似文献
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针对变电站电压无功控制中,存在的变压器分接头和电容器组投切频繁以及电容器投切对系统电压造成一定的冲击问题,将静止同步补偿器(STATCOM)用于变电站电压/无功调节控制中,提出了离散设备优先动作,连续设备精细调节的控制策略,协调有载调压变压器分接头、电容器组与STATCOM之间的运行,在电压发生波动时,投入STATCOM实现对电压快速和平滑的调节;在正常运行时,STATCOM有足够的裕量。在修正后的IEEE-9系统中对提出的的控制策略进行仿真分析,结果表明,提出的协调控制策略能够有效地减少变压器分接头和电容器的投切次数,减小电容器投切时对系统电压造成的冲击。 相似文献
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水电站的开停机速度直接关系到电站的经济运行并体现其自动化水平,主变压器中性点刀闸是机组开停机操作的一部分,原电站开停机时主变压器中性点刀闸需现地手动分合闸并进行发变组保护装置的主变压器接地与不接地保护压板的投退操作,影响了机组开停机时间,增加了人员劳动强度,而电网对机组开停机有严格的时间规定,通过原因分析,制定了对主变压器中性点刀闸及保护压板控制的技术改造方案并实施,改造后主变压器中性点刀闸及保护压板的动作可靠、正确,极大的减少了开停机时间,提高了工作效率,减轻了人员劳动强度,取得了很好的效果。 相似文献
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油浸式变压器的绝缘是由绝缘材料组成的,它是变压器正常工作和运行的基本条件,变压器的使用寿命由绝缘材料的寿命所决定,预防性维护是提高变压器使用寿命和提高供电可靠性的关键,分析了变压器固体、液体绝缘材料的各种性能,以及产生绝缘故障的原因,从而给出合理维护绝缘系统的措施。 相似文献
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Alagarsamy KRISHNAVEL Dusmata Kumar MOHANTA M. Jaya Bharata REDDY 《Frontiers in Energy》2013,7(3):288
With the prevailing power scenario, every watt-second of electrical energy has its own merit in satisfying the consumer demand. At the state of such a stringent energy demanding era, failure of a power generation equipment compounds the energy constraints which will not only result in a huge loss of generation but also have an impact on capital revenue. The unexpected failure of generator step-up (GSU) transformer is especially a major disturbance in the power system operation and leads to unscheduled outages with power delivery problems. The time lag in bringing back the equipment in service after rectification or replacement may increase the criticality as the process involves mobilization of spares and maintenance professionals. Hot atmosphere existing in the vicinity of thermal power stations running round-the-clock with more than 100% plant load factor (PLF) increases the thermal stress of the electrical insulation which leads to premature failure of windings, bushings, core laminations, etc. The healthy state of the GSU transformer has to be ensured to minimize the loss of power generation. As the predication related to failure of a GSU transformer is associated with some uncertainties, a fuzzy approach is employed in this paper along with actual field data and case studies for the well-being analysis of GSU transformer. 相似文献
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In this study, an interval‐parameter superiority–inferiority‐based regional energy management model has been developed for supporting regional energy management (REM) systems planning under uncertainty. This method is based on an integration of the existing interval mathematical programming, superiority–inferiority‐based fuzzy–stochastic programming and mixed integer linear programming techniques. It can explicitly address the system uncertainties that can be expressed as fuzzy‐random variables and/or interval numbers. In addition, dynamic interrelationships among system parameters can be successfully reflected through the introduction of fuzzy‐random variables and the associated transition probabilities. The developed method has then been applied to a case of long‐term REM planning. Useful solutions for the planning of energy management systems have been generated, which can be used for generating decision alternatives and thus help resource managers identify desired policies under various economic and system‐reliability constraints. The generated solutions can also provide desired plans for energy resource/service allocation and facility capacity expansion with a minimized system cost, maximized system reliability and maximized energy security. Tradeoffs between system costs and constraint‐violation risk levels can also be tackled. Higher costs will increase system stability, while a desire for lower system costs will run into a risk of potential instability of the management system. The results also suggest that the proposed methodology is applicable to practical problems that are associated with uncertain information. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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暂态过电压威胁着电网运行的稳定性、可靠性和电气设备绝缘安全,尤其是在交直流混联电网中交流电网产生的暂态过电压会对直流电网造成严重影响,监测暂态过电压有重要意义。针对带高频分量的暂态过电压难以监测的现状,介绍了一种基于常规电容式电压互感器(CVT)加装大电容单元,设计了500kV暂态电压监测装置,通过冲击电压试验验证了装置的响应性能及测量准确度,在将该装置实际挂网运行后,成功监测到电网中的暂态过电压波形;进而基于离散频谱的能量重心校正法提出了一种改进的暂态电压分量提取方法,通过雷电过电压波形仿真试验,对采集到的波形数据进行暂态分量提取,并对结果进行比较和分析,验证了改进后的方法更具实用性。 相似文献