500kV罐式断路器交流耐压试验

介绍了串联谐振法和并联谐振法进行交流耐压试验的原理，并对1例串联谐振进行500kV罐式断路器交流耐压试验出现的问题，提出了相应的解决方法。     

特高压交流试验电源特点探讨及比较

特高压输电技术的试验研究以及特高压设备的绝缘考核对交流试验电源提出了更高的要求。通过对试验变压器、串联谐振设备以及电力变压器等三种可供选择的交流试验电源各自的技术经济特点进行分析比较，指出其不同的适用范围。试验变压器适用于相对较小容量试品的短时高电压试验；串联谐振设备适用于容性试品的单相高电压试验，并能满足相对较大容量要求；电力变压器作为高电压试验设备，在结构和容量上并不经济，但作为交流试验电源，却具有较强的适应能力。因此，当试验变压器和串联谐振设备这两种常规方案不能满足特高压交流试验电源的基本要求时，应考虑电力变压器方案。     

变频谐振交流耐压试验在GIS故障检测中应用

主要介绍了GIS系统结构特点及变频串联谐振交流耐压的可行性,并对GIS系统进行交流耐压试验方法及现场利用变频串联谐振交流耐压试验方法对GIS故障进行查找进行了详细阐述。     

发电机定子交流耐压及tgδ测量中的几个问题及解决技术

通过发电机试验中的几个实例，介绍了发电机交流耐压中的谐振现象，解决技术以及如何利用现有电抗器组合进行谐振交流耐压试验。并介绍了１００ＭＷ双水内冷汽轮发电机如何在通水的情况下分相测量定子绝缘的介质损耗因数和电容量以及如何扩展电桥的电压，电流测量范围，以完成１００ＭＷ低转速水轮发电机定子绝缘介质损耗因数和电容量的测量。     

发电机定子交流耐压及tgδ测量中的几个问题及解决技术

通过发电机试验中的几个实例，介绍了发电机交流耐压中的谐振现象、解决技术以及如何利用现有电抗器组合进行谐振交流耐压试验。并介绍了１００ＭＷ双水内冷汽轮发电机如何在通水的情况下分相测量定子绝缘的介质损耗因数和电容量以及如何扩展电桥的电压、电流测量范围，以完成１００ＭＷ低转速水轮发电机定子绝缘介质损耗因数和电容量的测量     

柔性直流与极端交流系统间的谐波谐振

柔性直流输电技术正逐步应用于电网500kV主网架中。电网对送电设备高可靠性的要求,使柔性直流与交流系统的交互影响受到更多的重视。分析了柔性直流接入极端交流系统的高频谐振、低频谐振两种典型振荡模式。分析了柔性直流与交流系统高频谐振机理,高频振荡对控制参数变化不敏感,与控制链路延时、前馈策略相关性高,提出了可行的高频谐振抑制策略。此外,给出了典型的低频振荡仿真案例,仿真验证了低频谐振与控制参数的敏感性。     

谐振交流型同步电机励磁电源

谐振交流型同步电机励磁电源四川联合大学黄念慈，高心（成都６１００６５）摘要介绍了一种采用准谐振交流技术的同步电机励磁电源的工作原理和设计要点。该电源成功地．实现了功率管在零电压条件下的开通和关研，其开关功率管上的电压应力仅等于输入直流电源电压，输出调...     

电缆线路交接与预防性试验技术综述

总结了各种交直流耐压试验手段的原理、优缺点及与工频试验的等效性,认为串联谐振试验是取代工频试验的最佳选择。介绍了电缆介损与局部放电诊断技术的发展现状以及与超低频、振荡波和串联谐振三种典型交流电压试验的融合情况。通过对三种交流诊断性试验等效性的比较分析,提出了相关建议。     

大功率谐振式开关电源主回路的设计

本文以２２０Ｖ交流输入，５Ｖ×１００Ａ直流输出，谐振频率为１００ｋＨｚ的开关半桥式谐振电源的谐振回路和功率变压器的设计为例，给出了谐振电源主回路的设计方法。这种方法可用于不同输出功率和电压或以全桥方式工作的谐振电源的谐振回路和功率变压器的设计。     

基于高频交流链接技术电容充电电源研究

提出一种新型的应用于脉冲功率技术的串联谐振高压充电电源,它采用了高频交流链接技术(HF AC-link),具有内部低储能、高功率密度和高功率因数等优点。电源工作在电流断续模式及零电流零电压开关条件下,分析了电源的工作过程,推出了各个模式下的电流特性及输出电压和三相交流电压变化对电流特性的影响,应用了一种新颖的电荷控制方式,并进行了初步的实验验证。实验的结果表明,所提出的控制方式相比传统技术显著地提高了输入的功率因数,使功率因数达到0.99,且切换角度和电流谐振周期随三相交流电压和输出电压发生变化。     

并联谐振倍压变换器的三种工作模式

并联谐振变换器与倍压整流电路的结合组成一种性能良好的高压电源电路拓扑—并联谐振倍压变换器(PRDVCS)，本文对该电路进行详细分析，指出电路的三种工作模式及模式之间的转换条件，并且从中得出一些有价值的结论。通过计算机仿真，证实了这些结论的正确性。     

750kV变压器长时感应耐压试验关键参数计算

受试验装置容量的限制,750kV变压器现场长时感应耐压试验均采用变频谐振升压装置。由于试验前试验谐振频率不确定,变压器绕组集中参数（电容）难于通过测量得到,导致所需补偿的感性无功功率雄于确定：若试验谐振频率估算不准确,会造成所需试验电源容量的估算值与实际值有很大偏差。通过2例750kV变压器现场失败的变频法长时感应耐压试验．就现场试验频率和试验电源容量难于准确计算的问题,提出了一种较为准确计算试验频率和试验电源容量的方法．并在750kV等级变压器现场试验中测量试验谐振频率和试验电源电流加以验证,证实了所述计算方法是有效和准确的。     

Soft‐switching converter with low circulating current and wide range of ZVS turn‐on

In this paper, a new hybrid dc–dc converter with low circulating current within the freewheeling interval, wide range of zero‐voltage switching and reduced output current ripple is presented. The proposed hybrid circuit includes two three‐level pulse‐width modulation converters and a series resonant converter with the shard lagging‐leg switches. Series resonant converter is operated at fixed switching frequency (close to series resonant frequency) to extend the zero‐voltage switching range of lagging‐leg switches. The output of series resonant converter is connected to the secondary sides of three‐level converters to produce a positive rectified voltage instead of zero voltage. Hence, the output inductances can be reduced. The reflected positive voltage is used to decrease the circulating current to zero during the freewheeling interval. Therefore, the circulating current losses in three‐level converters are improved. Finally, experiments are presented for a 1.44 kW prototype circuit converting 800 V input to an output voltage 24 V/60A. Copyright © 2015 John Wiley & Sons, Ltd.     

小功率气体激光器软开关电源的研究

介绍了全金属结构小功率气体激光器的电源系统,电源采用高频变流技术设计,主回路为串联谐振负载并联输出的方式.为了实现激光器工作方式的多样化及激光器功率的精确控制,设计了有效的调制电路;同时为了适应气体激光器的工作特性,设计了可靠的预燃电路.实验结果表明:电源工作在谐振状态,实现了过零开关,减少了开关损耗,提高了电源效率;实现了对激光器工作方式和功率的调节,满足了激光器工作的要求.     

基于残流增量法的谐振接地系统故障定位方法

根据谐振接地系统单相接地故障的特点,提出了基于残流增量法谐振接地系统故障定位的新方法.该方法通过改变消弧线圈的电抗值,从而引起线路上各点的零序电流模值发生变化,根据零序电流模值的变化特性来判断故障位置.通过将零序电流模值折算到同一电压水平下相减,克服了接地电阻的影响.采用移动式零序电流互感器法,有效地解决了零序电流测量...     

PSM高频逆变电源在金属针布热处理中的应用

根据金属针布热处理工艺的要求,采用脉冲均匀密度调制(Pulse-SymmetricalModulated,PSM)功率控制串联谐振式DC/AC逆变器,设计了100kHz/5kW金属针布高频感应热处理电源。逆变器采用全桥串联谐振式电路,具有变频和功率调节两个功能。逆变器的开关管按照PSM的控制策略实现功率控制;逆变器跟踪负载谐振频率,控制开关管在零电流下开通和关断,实现零电流和零电压软开关。将本文设计的金属针布高频感应热处理电源应用于实际系统,改变了传统的热处理工艺,具有节能、加热温度均匀等优点。     

基于CPDM功率控制高频谐振电源的研究

提出一种基于复合脉冲密度(Composite Pulse—Density—Modulation)功率控制的新型高频谐振电源．对逆变器进行复合脉冲密度控制，逆变器具有逆变和功率调节两个功能，并且始终工作在串联谐振状态，功率开关器件零电压(ZVS)开通，零电流(ZCS)关断。比单纯的PDM功率控制方式具有更高的功率控制精度，轻载情况下电流可保持连续，且正弦波形畸变小，谐波分量小。     

Hybrid DC–DC converter with high efficiency,wide ZVS range,and less output inductance

In this paper, a new soft switching direct current (DC)–DC converter with low circulating current, wide zero voltage switching range, and reduced output inductor is presented for electric vehicle or plug‐in hybrid electric vehicle battery charger application. The proposed high‐frequency link DC–DC converter includes two resonant circuits and one full‐bridge phase‐shift pulse‐width modulation circuit with shared power switches in leading and lagging legs. Series resonant converters are operated at fixed switching frequency to extend the zero voltage switching range of power switches. Passive snubber circuit using one clamp capacitor and two rectifier diodes at the secondary side is adopted to reduce the primary current of full‐bridge converter to zero during the freewheeling interval. Hence, the circulating current on the primary side is eliminated in the proposed converter. In the same time, the voltage across the output inductor is also decreased so that the output inductance can be reduced compared with the output inductance in conventional full‐bridge converter. Finally, experiments are presented for a 1.33‐kW prototype circuit converting 380 V input to an output voltage of 300–420 V/3.5 A for battery charger applications. Copyright © 2015 John Wiley & Sons, Ltd.     

Development and experimental validation of automatic conversion procedure from mechanical to electrical connection for MEMS equivalent circuit

This paper describes equivalent circuit for micro electromechanical system (MEMS) using a type of behavior model for expressing mechanical and electromechanical element within circuit simulation, in order to simulate their dynamic behaviors easily. To fully treat the equivalent circuit as the behavior model, the equivalent interconnection expression for mechanical splice is required. In this work, a new approach has been proposed for converting the system composed of mechanical and electromechanical elements to equivalent circuit expression. This approach consists of substitution of unit equivalent elements and conversion of each equivalent interconnection for mechanical splices. We applied graph theory for equivalent interconnection. With this approach, complex MEMS consisting of a number of transducers and mechanical elements can be easily converted into equivalent circuits. In order to validate this approach, the resonant property of electrostatic comb-drive actuator was simulated using the equivalent circuit generated and measured experimentally. The simulated resonant frequency was in good agreement with the measurement and the admittance characteristics were well described using this circuit with a consideration of coupling capacitances at the comb electrodes. Copyright © 2009 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Power factor-corrected DCM-based electronic ballast

This paper deals with the design, modeling, analysis and simulation of power factor-corrected and low crest factor-based electronic ballast for a compact fluorescent lamp. The proposed electronic ballast is a combination of a buck–boost ac–dc converter as power factor regulator operating in discontinuous conduction mode and a half bridge series resonant inverter, which is used for converting constant dc link voltage into high-frequency ac voltage to drive the fluorescent lamp. The design, modeling and simulation of this topology are performed using MATLAB-Simulink for an 18 W, 220 V, 50 Hz compact fluorescent lamp. With the utilization of proper commutation techniques like zero voltage switching, the overall switching losses are reduced at high operating frequency of 60 kHz. The power quality indices such as displacement power factor, distortion factor, total harmonic distortion of ac mains current, power factor and crest factor are evaluated for proposed electronic ballast, which is found as per IEC-61000-3-2 class C requirements.