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Small-signal Modeling and Analysis of Grid-connected Photovoltaic Generation Systems 被引量:29
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作者 HUANG Hanqi MAO Chengxiong +1 位作者 LU Jiming WANG Dan 《中国电机工程学报》 EI CSCD 北大核心 2012年第22期7-14,24,共8页
The small-signal model of the photovoltaic generation system was built in a few references,and the sensitivity study of the dynamics process was performed.However,the dynamic model of the photovoltaic(PV)cells was not... The small-signal model of the photovoltaic generation system was built in a few references,and the sensitivity study of the dynamics process was performed.However,the dynamic model of the photovoltaic(PV)cells was not considered in these references,and the small-signal stability analysis and controllers'parameters design were not carried out using the proposed small-signal model.Therefore,a complete small-signal model of the photovoltaic generation system containing PV panels,inverters,controllers and power grid was built.The stability of the system after suffering a small disturbance was analyzed according to the eigenvalues.By means of eigenvalues participation factors analysis,the sensitivity of each mode to state variables was learnt,thereby the origin and characteristics of each mode was disclosed.Then,the eigenvalues traces were calculated,according to which controller's parameters were designed.A simulation model of the system based on Matlab/Simulink was presented.The simulation results show that the system is stable after suffering small disturbance of solar radiation intensity step,the design of the controller's parameters is proper,and the system dynamic responses are consistent with the result of small-signal analysis,which proved that the small-signal modeling and analysis in this paper are correct. 展开更多
关键词 PHOTOVOLTAIC EIGENVALUES MODELING small-signal
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Design and Construction of Compact Repetitive Nanosecond Pulse Generator Based on Tesla Transformer
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作者 LIU Yunlong LI Lee HUANG Jiajia YU Bing GE Yafeng LIN Fuchan 《高电压技术》 EI CAS CSCD 北大核心 2013年第9期2294-2300,共7页
A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetit... A compact high-voltage repetitive nanosecond pulse generator(HRNPG)was developed for studying the technology of repetitive nanosecond pulse technology and its related application.The HRNPG mainly consists of a repetitive charging module,a Tesla transformer and a sharpening switch.With its voltage lower than 1 kV,the primary repetitive charging circuit comprises two fast thyristors as its low-voltage switches.The spiral Tesla transformer acts as the main step-up component,and its peak transformation ratio is designed to be more than 100.A self-breakdown spark switch,i.e.the sharpening switch,is used to sharpen the output of the transformer and to generate nanosecond pulses.The HRNPG prototype is capable of generating pulses of 100 kV in peak with rise time 30 ns and the maximum repetition rate of 500 Hz on a 6 k load.Experimental results show,without any magnetic core,the developed Tesla transformer prototype can easily output high voltage while keeping itself small in size and light in weight,which is of significance for the compactness and portability of the pulse generator.The N2-insulated spark switch operated well at voltage close to 100 kV and the repetition rate within several hundreds of hertz. 展开更多
关键词 纳秒脉冲发生器 TESLA变压器 设计 紧凑 特斯拉变压器 施工 低压开关 火花开关
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Effects of Macroparticle Sizes on Two-phase Mixture Discharge Under DC Voltage 被引量:1
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作者 YAO Wenjun HE Zhenghao +6 位作者 DENG Heming WANG Guoli ZHANG Man MA Jun LI Jin YE Qizheng HU Hui 《中国电机工程学报》 EI CSCD 北大核心 2012年第13期I0020-I0020,203,共1页
随着放电等离子体在各个领域应用的不断扩大,两相体放电问题越来越重要,需要解决的基础问题之一即是两相体中放电发生、发展的特点和规律及影响因素。采用21种不同的介质材料研究直流电压下两相体放电的效应,由实验结果可知介质的介... 随着放电等离子体在各个领域应用的不断扩大,两相体放电问题越来越重要,需要解决的基础问题之一即是两相体中放电发生、发展的特点和规律及影响因素。采用21种不同的介质材料研究直流电压下两相体放电的效应,由实验结果可知介质的介电常数对放电路径基本无影响,而介质颗粒的粒径大小对两相体放电路径的选择起决定作用,即粒径效应。此外,对颗粒介电常数、电场畸变、光电离作用和颗粒荷电等几个方面进行研究,可知两相体放电的粒径效应与颗粒粒径大小紧密相关。 展开更多
关键词 两相混合物 粒子大小 直流电压 宏观 放电 高压输电线路 排放法规 外部绝缘
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Effect of High Electric Field on Lifetime Performance of Metalized Film Capacitor in Pulsed-power Applications 被引量:1
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作者 LI Hua CHEN Yaohong +4 位作者 WANG Bowen LI Zhiwei ZHANG Qin LIN Fuchang HE Wei 《高电压技术》 EI CAS CSCD 北大核心 2013年第8期2000-2005,共6页
High energy density capacitor is a key device to power supply source for electromagnetic gun (EMG) system, and extending its lifetime is important for increasing the reliability of the power source. Working in high el... High energy density capacitor is a key device to power supply source for electromagnetic gun (EMG) system, and extending its lifetime is important for increasing the reliability of the power source. Working in high electric field could affect the capacitor lifetime, and this effect on metallized polypropylene film capacitors (MPPFCs) in pulsed-power applications is studied and presented. Experimental re- sults show that the lifetime of MPPFCs decreases with the increasing peak value of charged electric field, and this decrease could be described by function (L/L0) ∝ (E/E0)–m, where, m=7.32. The lifetime of MPPFCs also decreases with the increase of the reversal coeffi- cients in underdamped circuits, which could be described by (L/L0) ∝ (ln(1/K0)/(ln(1/K))–b, where, b=0.7. These results provide a basis for the lifetime prediction of MPPFCs in pulsed-power applications. 展开更多
关键词 金属化薄膜电容器 寿命预测 脉冲功率 高电场 应用 性能 高能量密度 电力供给
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Minimum Load-curtailment in Transmission Network Planning Considering Integrated Wind Farms 被引量:14
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作者 CHEN Yan WEN Jinyu CHENG Shijie 《中国电机工程学报》 EI CSCD 北大核心 2011年第34期I0003-I0003,5,共1页
提出应用鲁棒线性优化理论来研究电网规划中含多个风电场的最小切负荷量计算问题,为含多个风电场的系统安全性研究提供了一条新的思路。根据Seng-Cheol Kang提出的鲁棒线性优化理论,建立电网规划中考虑风电场影响的最小切负荷量模型。... 提出应用鲁棒线性优化理论来研究电网规划中含多个风电场的最小切负荷量计算问题,为含多个风电场的系统安全性研究提供了一条新的思路。根据Seng-Cheol Kang提出的鲁棒线性优化理论,建立电网规划中考虑风电场影响的最小切负荷量模型。该模型以出力上下限和出力期望值来描述风电场的出力,最终转化为一确定性的线性规划问题并进行求解。在计及或不计及发电机调整的情况下,该模型均能够给出最安全的切负荷方案,除此以外还能给出更多介于最可靠与最经济之间的切负荷方案,实现灵活决策;在计及发电机出力可调的情况下,该模型能够给出相应的发电机出力方案;该模型能够初步给出各种切负荷方案下电网规划方案的可靠程度。基于修正的Garver’s 6节点系统和修正的巴西南部46节点系统算例测试结果验证了该方法的有效性。 展开更多
关键词 英文摘要 内容介绍 编辑工作 期刊
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