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本文介绍了国产多电平高压变频器在浙江荣胜纸业股份有限公司热电厂中的应用情况。变频器现场运行情况表明,电力行业采用国产高压变频器对锅炉风机进行调速节能,效果非常明显。 相似文献
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针对目前高压变频器在国内外所面临的专用控制电路滞后的现状,本文研究开发了一种适用于单元组合式高压变频器拓扑的新型控制专用电路。该电路采用了多相分时检索算法,具有方案新颖、控制可靠等优点,为开发大功率高压变频器奠定了基础。 相似文献
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介绍了刚刚承担的两个项目的设计中,其锅炉引风机均采用了高压变频器。通过收集整理有关高压电机调速、高压变频器选择及设计的许多资料,分析了高压变频装置在热电厂应用中需考虑的问题。 相似文献
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分析了大功率异步电机调速装置,谈了异步电机调速装置分类的认识.在工程中大功率电机用高压变频器和低压变频器方案进行对比分析,进一步提出高压斩波内馈调速装置并与高压变频器的性能比较,运用大功率异步电机调速装置具有较好的节能效益. 相似文献
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叙述了高压变频器系统的功能与节能效益,指出高压变频器应用于除尘系统的技术改造可提高设备的自动控制水平,还能达到节能降耗的目的。 相似文献
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介绍了高压变频器的特点及结构原理并对实际运行情况进行了节能分析,更进一步认识高压变频器的节能效果以及典型水泵的节能利用。 相似文献
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通过分析6 kV烧结高压变频器室的特点,提出了更适合高压变频器室的空调降温方案,并对改造后的空调降温方案进行了总结。 相似文献
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提出了采用矢量法进行轮廓基点求解的基本算法,该算法不受基点在坐标系中相限或方位变化的影响,方法简单,计算规律性强,易于编程实现;利用Microsoft Visual C 6.0,开发了相应的轮廓基点计算器,编程人员只要根据参数输入对话框输入相应的参数,即可自动计算出轮廓基点坐标。 相似文献
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《Energy Policy》2013
This paper describes initial analysis of branching points on a set of transition pathways to a UK low carbon electricity future by 2050. As described in other papers in this special issue, we are exploring and analysing a set of core transition pathways, based on alternative governance patterns in which the ‘logics’ of market actors, government actors and civil society actors, respectively dominate. This core pathway analysis is enhanced by analyses of branching points within and across the pathways, which informs how competition between different logics plays out at key decision points. Branching points are defined as key decision points at which choices made by actors, in response to internal or external stresses or triggers, determine whether and in what ways the pathway is followed. A set of initial branching points for our three core transition pathways is identified through project and stakeholder workshops, and drawing on analysis of actors’ choices and responses at past branching points in energy system transitions. The potential responses of the actors are identified at these branching points, and risk mitigation strategies are formulated for the dominant actors to reinforce that pathway, as well as opportunities for actors to move away from the pathway. 相似文献
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针对不规则三角网法在绘制等高线时仅在三边提取等高线控制点而出现控制点不足,从而导致绘制线形差的问题,提出了一种基于数据点高程云图对整个云图区域提取控制点的等高线绘制方法,首先利用OpenGL图形库提供的丰富的图形程序接口,根据距离最短和角度最大原理,建立数据点不规则三角网(TIN)模型;然后将数据点高程和颜色RGB值一一对应,实现数据点高程云图的生成;最后遍历数据点高程云图,按高程对应的颜色值提取等高线控制点,连接具有同一颜色值的控制点完成等高线图的绘制。实例应用结果表明,运用该法绘制等高线扩大了控制点的搜索范围,增加了等高线控制点的数量,使绘制的等高线图的线性较好,且与实际地形较符合。 相似文献
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超临界锅炉中间点温度为控制主蒸汽温度的超前信号,同时也是水冷壁超温保护的重要参数,所以对于中间点温度的仿真与预测具有重要意义。为了能够对中间点温度做出超前预测,提出了基于BP神经网络的中间点温度预测新方法。通过对某600MW超临界锅炉生产数据进行仿真,验证了该方法的有效性。 相似文献
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A shadowable point for a flow is a point where the shadowing lemma holds for pseudo-orbits passing through it. We prove that this concept satisfies the following properties: the set of shadowable points is invariant and a G δ set. A flow has the pseudo-orbit tracing property if and only if every point is shadowable. The chain recurrent and nonwandering sets coincide when every chain recurrent point is shadowable. The chain recurrent points which are shadowable are exactly those that can be are approximated by periodic points when the flow is expansive. These results extends those presented in Morales (Dyn Syst. 2016;31(3):347–356). We study the relations between shadowable points of a homeomorphism and the shadowable points of its suspension flow. We characterize the set of forward shadowable points for transitive flows and chain transitive flows. We prove that the geometric Lorenz attractor does not have shadowable points. We show that in the presence of shadowable points chain transitive flows are transitive and that transitivity is a necessary condition for chain recurrent flows with shadowable points whenever the phase space is connected. Finally, as an application, these results we give concise proofs of some well known theorems establishing that flows with POTP admitting some kind of recurrence are minimal. 相似文献
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就CAD二次开发工程中遇到的叶片截型数据点重构样条的问题进行了分析,提出了一个基于德布尔(de Boor)样条值点计算递推法的反求样条控制顶点的方法,推导了具体计算的公式,给出了计算方程组。在实践中应用该方法得到了过型值点的光顺的样条曲线,获得了满意的效果。最后就多种CAD软件实现的反求控制顶点进行了比较。 相似文献