Based on this study, this paper gives a formulator of epitaxy delta connection, draws the diagram of every voltage vector of the24-pulse system. 分析了24脉波整流各相序的电压矢量图,画出了24脉波的输出波形图。
Application of Delta AE Touch Screen in High Voltage Inverter 台达AE触摸屏在高压变频器上的应用
New Calculation Method of the Circulating Current in Delta Side Based on Voltage Loop Equation of Transformer 基于变压器回路方程的三角形侧绕组中环流求取新方法
Based on principles of the voltage compensation and the power factor correction, the working states of the series Delta converter and the parallel main converter and their importance in the whole UPS are analyzed. 依据UPS系统的电压补偿工作原理和功率因数校正工作原理,详细分析了串联Delta变换器和并联主变换器的工作状态及其在UPS系统中的重要作用。
( B) the load margins of the Pearl River Delta in GDPG with heavy load and eastern GDPG are small, therefore they are the weak region of voltage security; 珠江三角洲重负荷区域和粤东地区负荷裕度小,是静态电压安全的薄弱区域;
The formation of the severe imbalance of contact resistance between the end of unclose delta on secondary discharge winding and connecting wire is analysed. Consequently the paper draws a conclusion that the severe imbalance of contact imbalance caused the maloperation of zero-sequence voltage protection. 分析了放电线圈开口三角二次绕组的末端与连线的接触电阻严重不平衡的形成,得出了接触电阻严重不平衡是导致零序电压保护动作的原因。
This paper introduces a circuit model for analysing delta I noise in package, from whick the output voltage equations are derived. 介绍了一种分析封装中△I噪声的电路模型,根据此模型推导出输出电压方程。
The power supply based on Delta inverter can stabilize voltage and improve the power factor of the input to reduce harmonics. Therefore it has important actual meaning and research value. 基于Delta逆变技术的交流稳压电源既能进行瞬时的交流电压稳定补偿,又能提高整流输入端的功率因数,减少谐波对电网的污染,因而具有重要的实际意义和研究价值。
This paper develops a low voltage low power fully differential operational trans-conductance amplifier which suitable for bandpass sigma delta modulator. 设计了一种适合于带通sigmadelta调制器的低电压低功耗全差分跨导放大器。
Experiment results validate that the proposed voltage-controlled delta modulated control scheme has the merits of powerful ability to reject disturbances, slight inverter output: voltage waveform distortion, and very simple implementation. 实验结果证明,电压控制的Delta调制逆变器控制策略具有抗扰动能力强、输出电胜波形畸变小、实现简单等优点,适合应用于UPS逆变器。
A traction rectifier transformer with axial double split structure and 12 phase-24 impulse which is formed owing to the connection of delta with extended lines and phase displacement is introduced in this paper. Its short-circuit impedance calculation is discussed on the relation between voltage and magnetic potential. 介绍了采用延边三角形接线移相方式组成的12相24脉波轴向双分裂式结构牵引整流变压器,并从电压和磁势关系出发讨论其短路阻抗的计算。
To the offset voltage caused by thermoelectric effect, a new low-voltage measurement was introduced, namely three-point delta method. 针对低电压测量中热电势产生的偏移电压,介绍了一种新的低电压测量方法:三点式Delta测量法。
The Y connection and delta connection of transformer in DVR is simulated with Matlab and the three-phase four-wire structure with Y connection is used in the experiment, which can compensate zero voltage component of source voltage by approved SVPWM algorithm. 分别对变压器不同的连接方法进行了Matlab系统仿真,并对变压器星形连接的三相四线结构和改进的SVPWM控制方法作了实验,解决了系统中存在电压零序分量问题。
When current-controlled delta modulated control scheme is applied to UPS inverter, the output voltage amplitude is unstable in case of load variation and the output voltage waveform is heavily distorted by nonlinear load. To overcome the. 当电流控制的delta调制控制策略应用于UPS逆变器控制时,存在负载变动引起逆变器输出电压幅值不稳定、负载为非线性时逆变器输出电压波形畸变严重等问题。
The zero sequence components required by the relay are easily acquired and available for a long time when abnormality occurs in voltage circuits, the relay can automatically use the voltage of the open delta in stead of the voltage self produced to correct the function. 对于现场较易出现的电压回路异常、零序电压量自动由自产转为开口三角(3U0)电压后,继电器仍能正常工作;
The Design of Low Voltage Low Power Bandpass Sigma Delta Modulator 低电压低功耗带通sigmadelta调制器的设计
Analysis are centered on how to control the Delta converter as a sinusoidal current source and to control the main converter as a sinusoidal voltage source and the introduce of repetitive control into main converter. 在数学模型的基础上,围绕怎样将Delta变换器控制成正弦电流源,将主变换器控制成正弦电压源,以及在主变换器中引入重复控制等问题进行了分析。
Delta converter takes direct current SPWM control programs. The main converter takes hybrid control strategy which introduces the repetitive control in the base of the voltage and current double closed loop control. 讨论了串并联补偿式UPS的控制策略,对于Delta变换器采取直接电流SPWM控制方案;对于主变换器,在采用电压电流双闭环控制的基础上引入了重复控制的复合控制策略。
For the Delta converter, direct current control scheme are selected; while for the main converter, based on the multiple-loop of voltage and current control scheme, the repetitive control scheme are introduced. 对Delta变换器,采用了直接电流控制方案;对主变换器,在采用电压电流双闭环控制的基础上引入重复控制的复合控制方式。
Simulation and experimental results verify basically that Delta transform type UPS has voltage and current adjustment and compensation for power grid. 仿真和实验的结果基本验证了Delta变换型UPS对市电电压、电流的调节和补偿功能。