By using several sets of are characteristics and commutating circuit parameters in HVDC circuit breakers, the processes of self-excited oscillation in current commutation have been analysed and simulated.
本文利用几组高压直流断路器开断装置电弧特性和转移回路参数，对自激振荡过程作了较为详细的分析和计算。
The effects of arc unstable, arc characteristics and commutating circuit parameters on the process of self-excited oscillation in current commutation are discussed in detail.
理论分析和模拟计算的结果说明了不同的开断装置电弧特性和转移回路参数对自激振荡过程的作用，为高压直流断路器转移回路的参数设计提供了有效的分析和计算工具。
In this topology, the main switches are operated under ZVS due to commutation of the transformer magnetizing current and the parasitic drain-source capacitance.
在此转换器，其主要开关主要是利用变压器的激磁电流和开关本身内部的寄生电容的换向，使得主开关操作於零电压的模式底下。
The analytical expression of the phase current including rotor position detection error was given under these commutation instances.
以BLDC工作在三相星型六状态模式为基础，详细讨论了驱动系统的三种换向情况，即换向正常、换向超前和换向滞后，并分别给出了几种换向情况下包含转子位置检测误差的相电流的解析表达式。
The influence of local load on commutation capacity in inverters side is investigated, and the commutation current under load variation with different power factors is analyzed. It is mentioned that capacitor and static var compensator can increase short circuit current at converting branch.
该文探讨了地区负荷对逆变器换流容量的影响情况，在负荷幅值和功率因数变化的情况下，短路电流受到的影响，考虑了线间不对称短路的换相电流状态，提出电容补偿和静止无功补偿器可以改善系统短路容量的见解。
By using commutation overlap of the output cycloconverter and polarity selection of the input voltage and output filtering inductance current, the leakage inductance energy and the output filtering inductance current are naturally commutated, and the surge voltage and surge current of the cycloconverters are overcome, and ZVS switching of power devices in the input cycloconverter and ZCS switching of power devices in the output cycloconverter are realized. The converters lay the key technical foundation on new-type regulated sinusoidal ac power supply and electronic transformer.
借助输出周波变换器换流重叠、输入电压极性选择和输出滤波电感电流极性选择，实现了变压器漏感能量和输出滤波电感电流的自然换流，解决了周波变换器固有的电压过冲和环流问题，实现了输入周波变换器功率器件的零电压ZVS开关和输出周波变换器功率器件的零电流ZCS开关，为获得新型正弦交流稳压器和电子变压器奠定了关键技术基础。
By using the bi-polarity phase-shifted control strategy with phase-shifted control between the output cycloconveter and the input cycloconverter, commutation overlap period of the output cycloconverter, and polarity selection of the output filtering inductance current and the input voltage, the leakage inductance energy and the output filtering inductance current are naturally commutated, and surge voltage and surge current of the cycloconverters are overcome.
采用具有输出周波变换器与输入周波变换器之间移相、输出周波变换器换流重叠、输出滤波电感电流和输入电压极性选择的双极性移相控制策略，这类交-交变换器的周波变换器上的尖峰电压和环流得到抑制。
A new type of topology is made to improve the current commutation performance by mutual inductance.
提出了一种可以改善SR电机换相性能的新型互感换相型拓扑结构。
This articleaccording to not brushes direct current motor's most majorcharacteristic--Has substituted the mechanical commutationstructure which by the electronic commutation line is composed ofthe commutator and the electronics brush, has studied one kind ofnon-position transducer with emphasis, but with the aid of gainsthe rotor position signal method -- counter electromotive forcezero crossing detection law as well as with its relatedpre-localization split-ring phase change method of starting in theDSP formidable function with the software design, thus has replacedthe mechanical position transducer's function, overcame themechanical position transducer's existence for not to brush manyadverse effects which the direct current machine brought, simplified the entire control system's structural design, not onlyreduced the cost, moreover enhanced system's reliability.
本文根据无刷直流电动机的最大特点--以电子换向线路替代了由换向器和电刷组成的机械式换向结构，重点研究了一种无位置传感器而借助于DSP的强大功能用软件设计来获取转子位置信号的方法——反电动势过零检测法以及和其相关的预定位开环换相起动法，从而代替了机械位置传感器的作用，克服了机械位置传感器的存在给无刷直流电机所带来的诸多不利影响，简化了整个控制系统的结构设计，不仅降低了成本，而且提高了系统的可靠性。
The current are outputted to the electric engine after capacitance commutation, N pairs of electric engine coils are connected in series by two, 2N coil diodes are connected together with reversal direction; N PNP type triodes are connected together on the N pairs of electric engine coils in series; 2N switcher are connected at the lower part of the N pairs of electric engine coil in series; 2N the first one-way diode are connected between the PNP type transmitting pole and the drain electrode of the switchers; N the second one-way diodes are connected together between the collecting electrode of PNP type triode and the source electrode of 2N switcher.
电流经串联电容整流后输给电机，N双的电机线圈二二并联，2N个线圈二极管相互反方向连接；N个PNP型三极管串联在N双的电机线圈的上部；2N个开关器件串联在N双的各个电机线圈的下部；2N个第一单向二极管接在各PNP型三极管的发射极和各开关器件的漏极之间；N个第二单向二极管接在N个PNP型三极管的集电极和2N个开关器件的源极之间。
From the viewpoint of the inverter as a whole, considering the existence of the magnetic current and the actul situation of commutation inductance coupling coefficien K, the paper analyse the com...
此外，本文从逆变器的整体出发，并考虑到磁化电流的存在，以及换相电感间耦合系数K的实际情况，分析逆变器的换相过程，从而导出一组最优化换相参数计算公式。
Double space vector modulation can realize zero current commutation of the rectifier side, greatly reduce the switch loss, and improve the efficiency of the converter.
双空间矢量调制两级协调控制能实现整流级零电流换流，极大地减少了开关损耗，提高了变换器的效率。
This paper discusses the problem of electric power quality in the high-power thyristor-commutation system of aluminumelectroanalysis and analyses the connection between the capacity s selection of reactive power compensation equipment and restraint ofharmonic current resonance.
论述了铝电解大功率晶闸管整流系统电能质量问题，分析了该系统的无功补偿装置容量的选取与抑制谐波电流谐振的关系。
This process guarantees that no wearing of contact material limiting the let-through current reducing the values of the commutation circuit parameters, decreasing the recovery and the capacitor charging voltages.
这一进程的保障，没有佩戴触头材料限制允许通过电流减少的价值折算电路参数，减少复苏和电容器充电电压。
The proposed MLCR-CSC implements the zero-current switching, which can not only eliminate the switching losses, but also simplify the requirement of the absorbing circuit and the connection of the converter with AC system is simplified and high-capacity AC capacitor at network side during the commutation isn't needed.
介绍一种新型的多级注入式电流源变换器，这种变换器主桥实现了零电流切换，消除开关损耗的同时降低了对吸收回路的要求，简化了变换器与交流系统的连接，在换向期间网侧不需要大容量的交流电容。
High-power high-speed semiconductor switches RSD (Reversely Switched Dynistor) is a new solid converter switches based on the principle of controlled plasma layer commutation, can realize the perfect uniform among hundreds of one thousand amperes current, tens of kilovolt high voltage, microsecond nanosecond opening.
超大功率半导体开关RSD（ReverselySwitchedDynistor）是一种基于可控等离子层换流原理的新型固体开关，它能够将数十千伏电压、数百千安电流、微秒甚至纳秒级开通速度三者进行完美结合。
It is also demonstrated that there are several factors causing HVDC converter commutation failure, the most important factors include the advance firing angle, the voltage drop of the converter AC bus, the direct current increment and the short circuit impedance of the converter transformer.
论证了影响逆变器换相失败的因素有多个，重点研究了触发越前角、换流站交流母线电压跌落，直流电流增大以及换流变压器短路阻抗等因素对换相失败的影响。
The proposed auxiliary commutation circuit consists of one resonant inductor and two bidirectional switch, which provides the ZVS condition to the main switch without increasing voltage or current stresses.
提出的辅助变换电路由一个谐振电感和两个双向开关组成，此电路没有增加主开关的电压和电流应力，却给主开关提供了ZVS的条件。
Commutation failure is one of the most common failures for the high voltage direct current transmission system.
在特高压直流输电中换相失败也是主要的故障。
As to current crime theories, the width and depth of the researches about the commutation of punishment were unsatisfied, the articles about commutation of punishment only summarized the experiences in magazines and newspapers.
而在刑法理论上，关于减刑制度的研究的广度与深度尚不令人满意，散见于各类报刊杂志上的有关文章多为经验性的总结。