共查询到19条相似文献,搜索用时 78 毫秒
1.
并网光伏电站汇流箱组串电流节能控制过程中,采样和计算存在一定的误差,传统的节能控制过程,汇流箱输出电压不准确,实际输出汇流箱组串电流无法准确跟踪指令电流的变化,不能有效实现节能控制。提出一适用于并网光伏电站汇流箱组串电流节能控制方法,将并网光伏电站汇流箱组串指令电流转换成指令电压,并将其当成SPWM的调制波。在输出指令电压中加入一个前馈电压,使得并网光伏电站汇流箱电感两端的电压差含有一个基波分量,依据并网光伏电站汇流箱组串电流控制结果获得隐含层全部节点的正定矩阵,通过cholesky对隐含层的输出矩阵进行分解,基于分解结果获取并网光伏电站汇流箱组串电流节能控制效果最优解。仿真实验结果表明,所提方法在组串电流控制精度和节能方面均具有较好的工作性能。 相似文献
2.
3.
4.
5.
6.
7.
8.
某山地光伏电站地处强雷阵雨多发地区,2016~2018年该电站大量光伏组件因遭受雷击而损坏。结合现场回路接线、设备参数及设计图纸资料进行分析,查明光伏组件大量损坏的原因为发电光伏方阵的防雷保护设计存在缺陷。对该电站光伏区防雷保护进行优化改造后,截至2019年8月该电站再未发生过光伏板损坏事件。 相似文献
9.
10.
11.
12.
雷击严重威胁着电力系统中弱电设备的安全运行.针对弱电设备的雷害情况进行分析,介绍弱电设备的防雷保护措施. 相似文献
13.
在国内外.雷击事故严重威胁到电网的安全。对输电线路上雷电流和雷电压波形的测量系统进行研究,对电网防雷具有重要意义。研究了直接测量高压输电线路上雷电流和雷电压波形的组合测量传感器。其电流传感器采用自积分Rogowski圈;电压传感器采用自积分式电容分压器的原理,使用Rogowski圈的铝屏蔽壳作为高压臂电容的极板。8/20μs的标准雷电流和上升时间250rls的冲击电流试验表明,本文研制Rogowski线圈具有较好的频率响应特性和稳定的较小的灵敏度。冲击电压试验表明,所研制的电压传感器可较为准确地测量0.5/49μs和1.2/66μs冲击电压波形。该组合测量技术符合雷电测量要求。 相似文献
14.
Overvoltages on DC Side of Power Conditioning System Caused by Lightning Stroke to Structure Anchoring Photovoltaic Panels 下载免费PDF全文
Photovoltaic (PV) power plants and wind turbines are eco‐friendly power generators that utilize solar energy and wind energy, respectively. Many large‐scale PV power plants have been constructed using government subsidies. Large‐scale PV power plants are usually constructed in large open spaces that contain some tall structures. Therefore, such large‐scale PV power plants are likely to attract lightning, which may result in the malfunction or breakdown of electrical and electronic equipment. In this investigation, overvoltages generated when a lightning strikes a structure anchoring PV panels were measured using a 1:10 scale model. The measurements were also verified using the finite‐difference time‐domain method. The mechanisms of overvoltage generation on an actual‐scale PV power plant were also clarified. 相似文献
15.
16.
17.
G.Maslowski V.A.Rakov S.Wyderka J.Bajorek B.A.DeCarlo J.Jerauld G.H.Schnetzer J.Schoene M.A.Uman K.J.Rambo D.M.Jordan W.Krata 《高电压技术》2008,34(12):2575-2582
We present a comparison of data obtained during testing of lightning protective system of a residential structure in rocket-triggered lightning experiment at the International Center for Lightning Research and Testing(ICLRT)at Camp Blanding,Florida,and current surge generator experiment at Rzeszow University of Technology in Poland.Three different configurations of LPS were tested in Poland with the dc grounding resistances of the entire system 4.09 Ω(LPS 1a),1.65 Ω(LPS 1b),and 2.88 Ω(LPS 2).For LPS 1a with three ground rods the value of the peak current entering the electrical circuit neutral was about 56% of the injected current peak,and for LPS 1b with two additional ground rods and two 5 m long buried horizontal conductors it was about 16%.For LPS 2 with five ground rods interconnected by a buried loop conductor this ratio was 21%.The current waveshapes in the ground rods differed from the injected current waveshapes and the current waveshapes in other parts of the test system,especially,for poorer-grounding LPS 1a.The surge-generator results are consistent with those of triggered-lightning experiments at Camp Blanding,Florida(DeCarlo et al.,2008 [2]). 相似文献
18.
广西架空输电线路防雷现状与对策 总被引:1,自引:0,他引:1
通过对广西架空输电线路雷击跳闸率和事故率高的突出问题进行调查与统计分析,指出目前存在的主要问题是:在采取措施上存在着一定的盲目性,措施不当而起不到应有的保护效果,导致线路雷击跳闸率和事故率历年居高不下。为了解决上述问题,对现有线路防雷技术措施进行理论分析,并提出有针对性的保护措施,供线路防雷改造时参考。 相似文献
19.
计及旁路二极管效应的太阳能模组性能评估 总被引:3,自引:1,他引:3
为避免功率失配损失,太阳能模组一般都配置旁路二极管,提供一个能量散逸的途径。基于这种配置提出一种新的太阳能模组性能评估算法。依据实际旁路区段配置建立网络方程,通过牛顿–拉夫逊非线性迭代方法实现拓扑求解,继而获得模组的整体性能。在用制造商标准测试数据验证了该评估算法的有效性后,进一步考察各种阴影场景下的模组整体性能,并给出全局最大功率点(maximal power point,MPP)位置随辐射强度变化时的定性结论。理论分析和仿真结果表明,由于多辐射强度导致功率多峰值的存在,常规最大功率点跟踪(maximal power point track,MPPT)算法可能会因为只能检测到MPPT伪极大值点而失效;而且,旁路二极管的合理配置对太阳能模组性能有很大影响。 相似文献