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基于独立电压控制的多电平光伏逆变MPPT研究 被引量:1
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作者 易灵芝 李卫平 +2 位作者 刘江永 姚哲之 何东 《电源技术》 CAS CSCD 北大核心 2012年第10期1508-1511,1523,共5页
针对太阳能光伏发电系统中由于光伏阵列局部阴影和不匹配导致输出功率降低的问题,采用二极管钳位多电平逆变器方案,提出等效变换脉宽调制控制策略,通过独立控制每一个光伏阵列的工作电压,允许通过不同的电流,保证每个光伏阵列输出最大功... 针对太阳能光伏发电系统中由于光伏阵列局部阴影和不匹配导致输出功率降低的问题,采用二极管钳位多电平逆变器方案,提出等效变换脉宽调制控制策略,通过独立控制每一个光伏阵列的工作电压,允许通过不同的电流,保证每个光伏阵列输出最大功率,使整个系统输出功率最大。采用多电平逆变器,降低设备的额定电压,减少输出电压失真,降低输出电流谐波含量,提高转换效率。MATLAB仿真实验验证了该控制策略的可行性和有效性。 展开更多
关键词 二极管钳位多电平逆变器 独立电压控制 最大功率跟踪 空间矢量脉宽调制
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110kV变电站运行及保护措施分析探讨 被引量:1
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作者 张伟杰 《四川建材》 2009年第3期317-318,共2页
本文结合工程项目实例,详细介绍了独立式电压无功综合控制系统的工作原理,对其在110kV变电站运行中应注意的问题、保护措施技术及改进建议进行了详细阐述,分析总结出了电压无功综合控制系统在110kV变电站的运行效果。
关键词 110KV变电站 独立电压无功综合控制系统 电压无功调节 保护措施
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Control of Grid Side Converter under Unbalance Voltage Conditions for Variable Speed Wind Turbine
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作者 Watthana Suebkinom Bunlung Neammanee 《Journal of Energy and Power Engineering》 2014年第8期1475-1481,共7页
This paper proposes the control of a grid side converter under unbalance voltage conditions for wind turbine system. The control technique is designed to operate under unbalance voltage by independent control between ... This paper proposes the control of a grid side converter under unbalance voltage conditions for wind turbine system. The control technique is designed to operate under unbalance voltage by independent control between positive and negative components. The converter will regulate the DC link voltage at the specific value (650 V). To verify an operation of the proposed control, the simulation is conducted by MATLAB/SIMULINK program. The experiments are conducted on a 5 kW system composed of wind turbine simulator, machine side converter and the propose grid side converter for operation under unbalance voltage. By comparing the simulation experimentation results, it can be shown that the proposed control can be continuously operating through an extremely sag voltage without damage. Moreover the proposed control can deliver power to the grid and regulate DC link voltage under unbalance voltage. 展开更多
关键词 Grid side converter unbalance voltage positive component negative component
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On Trees with Double Domination Number Equal to the 2-Outer-Independent Domination Number Plus One
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作者 Marcin KRZYWKOWSKI 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2012年第1期113-126,共14页
A vertex of a graph is said to dominate itself and all of its neighbors. A double dominating set of a graph G is a set D of vertices of G, such that every vertex of G is dominated by at least two vertices of D. The do... A vertex of a graph is said to dominate itself and all of its neighbors. A double dominating set of a graph G is a set D of vertices of G, such that every vertex of G is dominated by at least two vertices of D. The double domination number of a graph G is the minimum cardinality of a double dominating set of G. For a graph G = (V, E), a subset D C V(G) is a 2-dominating set if every vertex of V(G) / D has at least two neighbors in D, while it is a 2-outer-independent dominating set of G if additionally the set V(G)/D is independent. The 2-outer-independent domination number of G is the minimum cardinality of a 2-outer-independent dominating set of G. This paper characterizes all trees with the double domination number equal to the 2-outer-independent domination number plus one. 展开更多
关键词 Double domination 2-Outer-independent domination 2-Domination TREE
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