瞬时电流

By the means of theory, simulation and experiment, the second part of this paper is then analyzed which is on the equivalent output resistance and inductance of the selected inverter and the effect to the output voltage"s amplitude and phase caused by the different values of the inverter"s component. It is concluded that by selecting certain precision level components, the difference of the output voltage amplitude is much greater than that of the output voltage phase.

其次通过理论、仿真和实验分析了本文所采用的电压电流双闭环瞬时控制方式逆变器的等效输出阻抗和两台逆变器器件差异对输出电压的幅值差和相位差的影响，从而得出选用一定精度的器件，两台逆变器输出电压的幅值差比相位差大得多的结论。

According to the mechanism of producing transformer excitation surge current caused by saturation of transformer core, the paper put forward a kind of method to discriminate excitation surge current and short-circuit current adopting calculation of equivalent instant excitation inductance average value.

从变压器励磁涌流的产生是由于变压器铁心饱和这一原理出发，提出了一种利用计算等效瞬时励磁电感平均值来区分励磁涌流与短路电流的方法。

P-q, d-q, unify power factor and instantaneous active current methods are analyzed and compared with each other.

并对p-q法，d-q法，UPF法和瞬时有功电流法进行了分析和比较。

Active power filter; harmonic current; instantaneous reactive power theory; low pass filter

有源电力滤波器；谐波电流；瞬时无功功率理论；低通滤波器

Active power filter ; instantaneous harmonic current detection ; harmonic measuring ; virtual instrument ; LabVIEW

有源滤波器；瞬时谐波电流检测；谐波测量；虚拟仪器； LabVIEW

Based on the compensate admittance model of Steinmetz theory a method is put forward which use instantaneous values of load current and voltage to denote it. The simulations and practical application in the design of SVC model have shown that the proposed method is very effective, accurate, and with fast response performance.

本文基于不平衡负荷的平衡化原理(即Steinmetz原理)的补偿导纳模型，采用负荷电流电压瞬时值采样的方法补偿无功功率，并将该方法应用于SVC样机的设计，结果表明，它们是快速有效和准确的，具有实际的工程应用价值。

By use of prediction of adaptive model and instantaneous increment of current amplitude, fault pre-triggering and triggering mechanism for bus protection are realized in this paper, and sensitivity and reliability are improved consequently.

本文还利用自适应模型的预测和电流瞬时幅值的增量实现了母线保护的故障预启动和故障启动，灵敏故障预启动是实现抗TA饱和母线保护方法的基础，可靠故障启动是母线保护出口的必要条件。

A closed-loop detecting circuit of harmonic and reactive current based on instantaneous reactive power theory has been analyzed and used in this APF system. It can achieve the accurate and real-time detection, and make the system stable.

本文将基于瞬时无功功率理论的自适应闭环检测方法应用于有源电力滤波器，使系统在快速、准确检测谐波及无功电流的同时，具有良好的鲁棒性。

Instantaneous reactive power theory applied on harmonic and reactive current real-time detection is presented in this paper.

介绍了瞬时无功功率理论在谐波和无功电流实时检测方面的应用。

The results indicate that it is feasible to test real time harmonic current using the method based on instantaneous reactive power theory.

结果表明，利用基于瞬时无功功率理论的方法实时检测弧焊电源的谐波电流是可行的。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。