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变电站的变压器因故障退出运行,需使用备用变压器进行替换运行.为了确定备用变压器能否代替故障变压器与运行变压器并列运行,需对备用变压器与运行变压器的技术参数进行分析.根据变压器并列运行条件分别计算备用变压器与运行变压器的参数匹配情况,为不同参数变压器并列运行可行性研究提供依据. 相似文献
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随着新增发电装机的不断增长,我国对各类变压器的需求也持续增长。近年来,国内变压器行业通过引进国外先进技术,使变压器产品品种、水平及高压变压器容量都有了大幅提高。国内企业生产的变压器品种包括超高压变压器、换流变压器、全密封式变压器、环氧树脂干式变压器、卷铁心变压器和组合式变压器等。此外,随着新材料、新工艺的不断应用,国内各变压器制造企业还不断研制和开发出各种结构形式的变压器,以适应市场发展。 相似文献
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本文简要说明了低损耗节能型变压器的发展情况,各系列配电变压器的特点和节能效果,给出了按负荷率选择变压器容量的计算公式,分析了按变压器的最佳负荷率来选择变压器容量不合理的原因,给出了按变压器年有功电能损耗率最小的节能负荷率来选择变压器的容量和按变压器的经济负荷率来选择变压器容量的方法。 相似文献
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以一种新型平衡变压器为研究对象,依据变压器绕组接线方程、变压器端口输出电压方程、变压器磁势平衡方程和变压器电压传递方程等理论,分析了新型平衡变压器的绕组接线方案和铁芯绕组结构,建立了新型平衡变压器的绕组基本方程,推导了新型平衡变压器的平衡条件,研究了新型平衡变压器的平衡特性. 相似文献
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本文介绍了电力变压器、配电变压器、SF_6变压器、非晶合金变压器、难燃油变压器、密封式变压器、干式变压器、预装式变电站、卷铁心变压器的现状。描述了行业现状、“十五”市场需求、合资企业情况,并列出发展展望。 相似文献
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正1前言电力变压器是电力网中的主要电气设备。它分为发电机变压器、输电变压器、联络变压器和配电变压器四大类。工业变压器是在电力变压器的基础上发展起来的特殊用途的变压器。因此,它也称为特种 相似文献
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变压器外部故障时,变压器内部绕组的匝数及漏磁通所经磁路均未变化,变压器绕组发生故障时,变压器漏电感肯定会发生变化。通过测量变压器的短路电抗并计算分析,可以判断变压器的绕组故障。参数辨识法诊断变压器绕组故障,即是通过测量变压器三相电压和电流量,采用递推最小二乘法,辨识变压器绕组漏抗,从而判断变压器绕组是否故障。 相似文献
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风电接入系统暂态电能质量扰动小波检测方法 总被引:6,自引:0,他引:6
随着风能发电的大规模发展,风能电并网运行是一种必然的发展趋势.风能的波动性、间歇性和随机性等特性使接入风电的电力系统的运行特性和电能质量受到复杂的影响.为此,针对风电并网运行中的电能质量问题,重点研究风电接人系统的暂态电能质量扰动的小波检测方法,详细分析暂态电能质量扰动小波检测的基本原理和实现策略,并给出仿真结果.理论... 相似文献
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The ever-increasing penetration of wind power integration into a power system can produce significant impacts on the operation of an interconnected power system. As the major energy conversion technology for large wind turbines, the doubly fed induction generator (DFIG) will play an important role in future power systems. Hence, the impacts of the DFIG on the low-frequency oscillations of interconnected power systems have become an important issue with extensive concerns. This paper examines the impacts of several factors, including the DFIG transmission distance, tie-line power of the interconnected system, DFIG capacity, with/without a power system stabilizer (PSS), on the low frequency oscillation characteristic of an interconnected power system using both eigenvalue analysis and dynamic simulations. To investigate the effects of these factors on the interarea oscillation mode, case studies are carried out on two two-area interconnected power systems, and some conclusions are obtained. 相似文献
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There are various methods for procurement of reactive power as an ancillary service in deregulated market environment. Reactive power market model based on voltage control zones and two-step optimal power flow algorithm is proposed in this paper. Zones are formed by splitting the power system or a control area of an interconnected power system into autonomous voltage sub-areas with sufficient reactive power reserves using the electrical distance method. Every zone formes a single reactive power market. First step of an optimization algorithm determines zonal reactive power prices based on generator's cost functions for reactive power production. Total cost minimization is the goal of the second optimization step where the final dispatching decision is made according to transmission losses and zonal reactive power prices respecting power system planned conditions and security constraints. Proposed algorithm is tested on IEEE 39 bus test system ensuring the system operator's minimal payment for reactive power and transmission losses, without jeopardizing power system security. 相似文献
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在节能减排的背景下,工业企业电网自备电厂机组和用能设备呈现单机容量不断增大的趋势,在提升企业能效水平的同时,也给企业电网的安全稳定运行带来新的挑战。针对工业企业电网面临的功率平衡控制难题,提出工业负荷参与系统有功平衡的调节方法。并引入快关汽门作为安稳控制的一种手段,提出有功协调控制系统总体方案和实现路径。通过提升负荷和电源的快速响应能力,实现工业企业电网正常生产和事故紧急状态下的精细化控制,为提高企业电网安全稳定运行水平和企业经济效益提供技术支撑。在某电解铝企业电网的工程实践表明,该方法是切实可行的。 相似文献
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The paper proposes a method to select a power factor for an inverter of distributed power generation systems to keep appropriate voltage of a power system with the high penetration of inverter-interfaced generation. The increase of inverter-interfaced power sources, such as wind and photovoltaic power generation, arouses concerns on the voltage fluctuations in a power system. While constant power factor control of an inverter has been studied as a means to stabilize the voltage of a power system, there still remains room to improve the control. The proposed method in the paper selects the power factor based on the R/X ratio of the looking-back impedance into the interconnected power system. By normalizing the related variables, a general formula is derived for the power factor, and the resultant relationship between the apparent power and voltage of an inverter becomes identical irrespective of the R/X ratio with the control. Sample studies show that, by operating an inverter with the power factor, voltage fluctuations are effectively suppressed even for a power system with the high penetration of inverter-interfaced generation. 相似文献
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在平滑海上风电出力波动的应用需求下,提出一种储能优化配置方法。利用小波包分解算法对海上风电出力曲线进行分解,得到储能系统全年功率响应曲线。采用基于云模型和模糊C均值聚类算法相结合的改进场景聚类算法,对储能全年功率响应曲线进行聚合,生成储能功率响应典型场景。以储能年综合成本最低为目标,构建储能优化配置模型。采用粒子群算法对海上风电储能优化配置模型进行求解,最后通过算例仿真对所提方法和模型进行分析验证。结果表明:所提模型和方法能综合考虑海上风电场侧储能的实际运行特性,可有效指导海上风电场的储能配置和建设规划。 相似文献