无功的

By building the low frequency model of the system, in the rectifying mode and regenerating mode, the dynamic adjusting procedure of realization for unity power factor, absorbing or regenerating capacitive reactive power, inductive reactive power from or to power grid are investigated.

通过建立系统低频数学模型，分别在顺变和逆变状态下，探讨系统实现单位功率因数、从电网吸收或回馈容性、感性无功功率的动态调节过程。

C. exciting generator operating deeply at phase lead as an advancer is correct, which open a new route to solve the problem of sustained over-voltage on supertension line since its reactive power excesses.

从而为解决电力系统超高压输电线路无功过剩引起线路持续过电压问题提供一条新的途径。

This paper emphasizes on two matters in reactive power optimization: objective function and arithmetic of finding the best global individual.

本文着重研究无功优化中的两大问题：目标函数和寻优算法。

A new cophase power supply system is designed by combining the active filter,V/x connection and autotransformer.

通过以检测并得到的同相综合补偿电流为参考，控制有源滤波器消除三相不平衡，并滤除谐波和无功。

The simulation results show that the vector control system based on this improved scheme has better dynamic and static performance. It solves a lot of problems such as larger error in the MRAS based on the back electromotive force when the motor runs across the zero speed and the instability based on the instantaneous reactive power in the regenerating mode and has high estimating precision.

仿真表明基于该方法的矢量控制系统动静态性能好，能有效解决反电动势模型参考自适应方法在速度过零点辨识误差大以及瞬时无功功率模型参考自适应方法在转速给定为负阶跃时转速不稳定问题，转速估计精度高。

In order to overcome the shortcoming of the passive power filter and parallel active power filter, a new parallel hybrid active power filter on base of the conventional parallel active power filter is proposed in this thesis.

本文针对无源滤波器和单独使用的有源滤波器的缺点，对传统的并联混合有源电力滤波器进行创新性改造，提出一种适用于大功率场合的谐波和无功综合治理的新型并联混合有源电力滤波器。

This paper introduces the principles of comprehensive substation voltage and reactive power control, and proposes the hardware structure and characteristics of the high performance MVR-Ⅲ series of this type of systems. It is emphasized that the special harmonic analysis and monitoring function of this system plays a very important role on safety of the reactive power compensa- tion equipment.

简要介绍了变电站电压、无功综合控制的原理，介绍了高性能的MVR-Ⅲ型系列装置的硬件结构及其性能、特点，强调了该系列装置特有的谐波分析和监视功能对无动补偿设备的安全有着极为重要的作用。

The pollution problem caused by harmonic sources to power system has become more and more serious. As traditional filter devices , passive filters can not only suppress the harmonic but also compensate the reactive power and are still a widely used measure for harmonic suppression.

摘 要 谐波源对电网的污染问题已经日益引起人们的关注，而无源滤波器作为传统的滤波装置，既可以滤除谐波，同时可以兼顾无功补偿的需要，目前仍是应用较为广泛的抑制谐波污染的措施。

According to the textual research of such scholars as Qigong,"lijia" means the person who is laic, non-professional and unskillful. Thereby,"lijiahua" can be regarded as this kind of painting. Qian Xuan and Zhao Mengfu compared the "lijiahua" with "intellectuals painting", and the intellectuals refer to the officials in the government.

按照启功等前辈的考证，&戾家&意指外行的、无师承的、非专门的、不精通的人，&戾家画&可指为脱略常法、无师承、有违绘画法则的画作，是一种业余水平的绘画；钱选和赵孟頫将&戾家画&与&士夫画&想对应，&士夫&应指在位的文人官僚。

To solve the above problems, a novel resonance injection type hybrid active power filter is presented, it allows the energy exchange between the DC-side capacitor and grid, DC-side voltage will be stabilized after the proposed control method base on the regulation of reactive current is adapted. On the other hand, a new current control method is proposed which is based on the control of error between injection current and harmonic current compensated by passive power filter using recursive PI.

在此基础上结合提出的基于基波无功电流闭环调节的直流侧电压控制方法，保证了直流侧电压的稳定；提出了采用递推积分将无源滤波器作用后电网谐波电流与注入支路补偿电流进行闭环比较控制以获得参考电流的方法，减小了误差，提高了系统的控制精度。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。