逆电流

Requirement of normal operation for series hybrid APF with fundamental bypass channel, which is one of the topologies with high ratio between the VA ratings of the load and inverter, is specified.

带基波电流旁路通道的串联混合有源电力滤波器是高负载／逆变器容量比的的拓扑之一，本文详细分析了该拓扑正常工作需满足的条件。

Experiment results prove such method can effectively improve output current waveform of inverter.

实验证明了该方法能有效地改善逆变器的输出电流波形。

This equipment applies some advanced techniques, including short net identical phase anti-parallel link rectification, resistor split resolving rectiformer, 3 inch thyristor parallel link, on-line current automatic periodic anti-direction, and automatic voltage regulating and current stabilizing.

该装置采用了短网同相逆并联整流，阻抗裂解式整流变压器，3in(7.62cm)晶闸管并联技术，在线电流自动周期反向和自动调压、稳流技术。

In the thesis, the space vector modulation of MC can be synthesized by fictitious rectifier and fictitious inverter. Two space vector control strategies of MC, which combines output line voltage space vector modulation and input phase current space vector modulation, is adopted.

本文采用输出线电压空间矢量调制和输入相电流空间矢量调制相结合的双空间矢量调制策略，对虚拟整流器和虚拟逆变器的空间矢量分别进行了分析，然后将二者综合得到矩阵变换器的调制方法。

The proposed control strategy can predict the system variables one beat advanced and solve the delay problem of digital control primely, which greatly improves the dynamic performance and stability of system.

在电流源逆变器系统离散状态空间方程的基础上，利用状态反馈极点配置理论，文中详细给出了状态预测观测器系数矩阵的设计过程。

The principle of the main circuit, choice of the control parameters, choice of the control algorithm and the principle of point-by-point integration method are first introduced in this paper.

论文首先介绍了逆变主电路的原理、控制参量的选择、控制算法的选择，以及焊接电流、电压的逐点积分检测原理。

In the fourth part the algorithm of SVPWM that is adopted by the system implements the motor speed regulation.

第四部分系统采用SVPWM算法减少了逆变器输出电流的谐波，降低了脉动转矩，提高了电压的利用率。

Thanks to this scheme, the phase, root-mean-square value, frequency, and waveform of the output sinewave voltage can be controlled precisely and the system has excellent steady-state performance, fast dynamic response performance, fast and reliable current cut-off protection function.

提出了一种新的适应"模块化"要求的高性能逆变电源控制方案，该方案是一种带有输出电压相位控制及负载电流前馈控制的多环反馈控制方案，能对输出正弦波电压的相位、有效值、频率、波形进行精确控制，使系统具有良好的稳态、动态特性以及快速可靠的截流保护功能。

However, there are several common problems existing in the current inverter spot welding machine, which are unideal current wave, unsatisfied work stability and relatively big power consumption, etc.

但是，现有的逆变式点焊机普遍存在电流波形的工艺性较差、工作稳定性差及功率较大等问题。

The dynamic and ouput performance of the inverter system is also analysed by simulation with Saber software, and the main reasons is enduced. As the calculate speed of the DSP core is consided, digitally and analogically hybrid control scheme is adopted in this paper.

分析了两态滞环电流控制DBI的控制原理，利用Saber电路仿真软件对逆变器系统进行了仿真，并对系统的动态性能以及外特性进行了研究，得出影响系统动态性能及外特性的主要因素。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。