共查询到18条相似文献,搜索用时 140 毫秒
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目前国内风电场内集电线路多为10kV或35kV系统,针对风电场集电线路经常出现的单相接地故障,本文在风电场工作实践的基础上对10kV系统单相接地故障进行分析,并结合风电场的实际情况提出了解决措施,提高供电可靠性,保证设备安全稳定运行。 相似文献
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当集电线路发生故障跳闸时,由于风电场环境特殊,线路中存在较多T接风机和电缆架空混架情况,传统的阻抗法测距在风电场集电线路中难以实现故障精确定位,风电场运维人员需要花费大量的人力物力进行故障清除,因此一种在线式的故障定位手段显得极为重要.由于行波法故障测距只与监测设备采集波头的时间差和波速有关,且在风电场发生故障时无需解列电缆即可进行故障定位.文中从行波法故障测距入手,基于风电场特殊的运行模式,系统地介绍了行波法在风电场集电线路中测距优势.通过现场风电场集电线路监测终端的试挂网运行故障定位案例,证明了此系统具有较高的稳定性和定位的精确性. 相似文献
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维护水平是影响风电机组维护成本的重要因素之一。故障模式、影响及危害性分析根据危害度对故障模式进行分级,找出危害度较高的故障模式并给予较多的维护资源,有助于提升风电机组的维护水平。然而,在目前的风电机组FMECA中,监测控制与数据采集系统的存在、处理故障的过程以及故障发生及其影响的真实情况等特征未被充分利用。文中结合传统FMECA与以上特征,提出了一种面向风电机组维护的改进FMECA。为更接近故障处理过程,将风电机组分为机组层,SCADA层及部件层。分别将SCADA系统的报警内容、部件的故障模式及机组停机视为SCADA层的故障模式、原因及对高层级的影响。同时,根据机组各故障的发生概率及影响的真实情况重新定义其等级。最后给出了改进FMECA在某型号风电机组中的应用实例。 相似文献
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摘要: 近几年风力发电快速发展,然而由于风力发电设备技术不过硬,以及地区消纳和电力送出建设不配套,导致风电场出现设备故障率高,出现大面积弃风和窝电现象。首先对风电场“运检维”管理现状进行了详细的介绍;其次,针对电力市场对风电场“运检维”管理的影响,从风力发电行业、风电场运行管理、风电场检修管理与风电场维护管理4个方面进行了详细的阐述;再次,详细讨论了电力市场环境下 “运检维”管理遇到的问题;最后,针对电力市场环境下风电场“运检维”管理方法,进行了分析与展望。 相似文献
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随着风电场并网容量的不断增加,分析风电场短路电流特性也愈加重要。电网发生不对称故障时,双馈风力发电机的短路电流与电网发生对称故障时的短路电流有差异。另外,受Crowbar动作特性的影响,加装Crowbar保护的双馈风力发电机在不同机端电压跌落程度中的短路电流也不同。为全面分析风电场的短路电流特性,首先推导了双馈风力发电机适用于对称故障及不对称故障下,计及Crowbar动作特性的短路电流解析式;然后基于Crowbar动作区域曲线,判断风电场中各双馈风力发电机Crowbar的动作情况;以Crowbar是否动作作为分群准则,将风电场分群等值为两机模型,在此基础上进行风电场的短路电流计算。文章利用Matlab/Simulink仿真软件,验证了对称故障及不对称故障下计及Crowbar动作特性的风电场短路电流计算方法的正确性。 相似文献
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本文通过对变频供水设备建立故障树,并对其进行定性、定量分析,揭示了故障树分析(FTA)对提高产品性价比的重要意义。 相似文献
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Fault ride through of fully rated converter wind turbines with AC and DC transmission 总被引:1,自引:0,他引:1
Ramtharan G. Arulampalam A. Ekanayake J.B. Hughes F.M. Jenkins N. 《Renewable Power Generation, IET》2009,3(4):426-438
Fault ride through of fully rated converter wind turbines in an offshore wind farm connected to onshore network via either high voltage AC (HVAC) or high voltage DC (HVDC) transmission is described. Control of the generators and the grid side converters is shown using vector control techniques. A de-loading scheme was used to protect the wind turbine DC link capacitors from over voltage. How de-loading of each generator aids the fault ride through of the wind farm connected through HVAC transmission is demonstrated. The voltage recovery of the AC network during the fault was enhanced by increasing the reactive power current of the wind turbine grid side converter. A practical fault ride through protection scheme for a wind farm connected through an HVDC link is to employ a chopper circuit on the HVDC link. Two alternatives to this approach are also discussed. The first involves de-loading the wind farm on detection of the fault, which requires communication of the fault condition to each wind turbine of the wind farm. The second scheme avoids this complex communication requirement by transferring the fault condition via control of the HVDC link to the offshore converter. The fault performances of the three schemes are simulated and the results were used to assess their respective capabilities. 相似文献
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Multi-pole permanent magnet synchronous generator wind turbines' grid support capability in uninterrupted operation during grid faults 总被引:1,自引:0,他引:1
Emphasis in this paper is on the fault ride-through and grid support capabilities of multi-pole permanent magnet synchronous generator (PMSG) wind turbines with a full-scale frequency converter. These wind turbines are announced to be very attractive, especially for large offshore wind farms. A control strategy is presented, which enhances the fault ride-through and voltage support capability of such wind turbines during grid faults. Its design has special focus on power converters' protection and voltage control aspects. The performance of the presented control strategy is assessed and discussed by means of simulations with the use of a transmission power system generic model developed and delivered by the Danish Transmission System Operator Energinet.dk. The simulation results show how a PMSG wind farm equipped with an additional voltage control can help a nearby active stall wind farm to ride through a grid fault, without implementation of any additional ride-through control strategy in the active stall wind farm. 相似文献
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Safe operation of a wind farm (W/F), under fault conditions, requires a grounding study to ensure protection against developed voltages (step and touch). A key stage in the design of a wind farm's grounding system is to determine the maximum ground fault current. The aim of this work is to examine how different short-circuit calculation (SCC) procedures affect the calculation of developed voltages (step and touch) at a wind farm and therefore the provided level of safety. For this purpose, the response of the interconnected grounding system of an actual wind farm is calculated, under fault conditions, using three alternative SCC methods and the results obtained concerning violation or not of safety criteria are presented. 相似文献
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针对小波包分解振动信号时会产生频谱混叠从而导致齿轮箱复合故障特征能量谱提取困难的问题,提出基于旁路滤波改进小波包的方法对双馈风电机组齿轮箱复合故障振动信号进行研究,并以风电场的大量齿轮箱振动信号为基础,运用传统小波包及旁路滤波改进小波包分别对齿轮箱振动信号提取特征能量谱。实验结果表明:运用旁路滤波改进小波包对双馈风电机组齿轮箱复合故障振动信号进行分析,可有效避免传统小波包分析振动信号的频谱混叠现象,准确提取每种故障状态的特征能量谱。 相似文献