查询词典 phase inverter

The ship electric propulsion system that we are going to discuss consists of the following parts: six-phase double Y winding shifted by 30°synchronous motor, diode clamped three-level inverter, fixed pitch propeller and control installment of electric propulsion systems based on air-gap-field orientation vector control.

本论文所研究的船舶电力推进系统各个组成部分分别是：双Y移30°六相电励磁同步电动机、二极管嵌位式三电平逆变器、定距螺旋桨船舶推进器和采用基于气隙磁场定向矢量控制策略的电力推进系统控制装置。

Since the input and output current of the coupling transformer are in phase, the tank's current is lagging the inverter driving voltage.

下图，感抗高的结果是逆变器电流差不多滞后逆变器电压90度角。

The principle of the novel single-phase hybrid active power filter is described in detail. Based on the above analysis, Kalman filtering approach for estimation of harmonics is presented to improve the speed and precision of harmonic detection, and it also can avoid the influence made by voltage distortion on harmonic detection. A new current control strategy based on energy balance is presented to regulate the active part absorbing or releasing active power and control the inverter to produce current opposite to the harmonic current reflowing in injection branch, the above method combined with harmonic current tracking control that keeps the stabilization of dc-side voltage and improve the reliability of the system.

并详细分析了系统的滤波原理，提出了基于卡尔曼增益自调整的改进型动态谐波含量估计方法，能够快速准确的跟踪检测电网谐波电流，并且克服了电力机车等冲击性负荷引起的电网电压畸变对谐波检测精度的影响；提出了基于逆变器两侧能量平衡的电流控制方法使有源部分吸收或释放一定有功或无功功率及产生与注入支路回灌谐波电流相反的抑制电流，然后联合电网谐波电流跟踪控制以获得系统参考信号，保证了直流侧电压的稳定，提高了装置可靠性，增强了系统滤波性能。

Developing a high performance control strategy is a significant point in three-phase PWM inverter, which is an important part of wind power generation.

三相PWM逆变器是风力发电并网系统的主要部分，开发一种高性能的逆变器控制策略已经成为研究的重点。

Based on the DM model of the three-phase four-leg inverter, the DM performance of SPWM jump-edge delay strategy is analyzed. Its DM performance becomes worse because of the alteration to the local volt-second equivalent between the pulse and sine wave.

虽然SPWM跳变后移策略会使三相四桥臂逆变器获得最佳的共模输出特性，但因它改变了脉冲局部与正弦波的伏秒等效关系，导致逆变器差模特性变差。

Then a 690V/200kW three-level inverter of six-phase SM is developed, and experimental results verify the techniques presented in the paper.

作者利用这些技术设计开发了&690V/ 200kW三电平六相同步电机变频调速装置&，并在该装置上进行大量动态和稳态实验研究，取得良好的运行效果。

This thesis proposed the design and implementation of an ASIC for the motor control with DTC technology. Note that this ASIC is implemented by cell-based Design style with Verilog language.The basic principle of the Direct Torque Control is to select the switch sequence of the inverter. Those switches will control the magnetism and torque of the stator, to induce a fast response of the induction motor. Furthermore, the d-q axle's static coordinate, which is transferred from both the three-phase current and voltage, is used to compute the stator's magnetism and torque. By comparing with original values, those magnetism and torque will be calculated and set to new data. Then the switching table and the hysteresis controller are decided with the new data to generate a voltage vector and to control the stator magnetism and torque.

直接转矩控制的基本原理为经由侦测马达定子磁通与转子转速，来适当的选择变频器功率电晶体的切换状态，以获得快速且不易受外在环境影响的马达控制响应；首先，根据量测三相电流与利用变频器的切换状态取得马达的三相电压，将其转换至d-q轴静止座标，然后藉此估测马达的磁通量与转矩量，再分别与侦测的定子磁通量和转矩量比较后，得到定子磁通量与转矩量比较的结果，再利用DTC电压向量切换表(DTC Voltage Vector Switching table)，依定子磁通与转矩的比较值及马达所在的角度位置，来选择一个适当的电压向量，进而依切换顺序来激发功率电晶体，达到控制感应马达的目的。

And then the output voltage harmonic for the single-phase three-level SPWM inverter under the half triangular and half saw-tooth carrier wave is studied. It also discusses how to select the carrier ratio N and the effects to the output wave by modulation ratio M.

着重对载波为半波、三角波、半波、锯齿波的单相三阶 SPWM逆变器的输出电压的谐波处理、载波比N的数值选择、调制比M对输出波形的影响等进行了研究。

In chapter 2, the soft switched inverter topologies for high power multi-phase applications are studied.

在第二章中，对适用于VSCF电源的软开关变换器拓朴进行了研究。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。