New mulberry trees wereplanted, silkworms and looms brought in.

The mulberry trees bare and the fields were brown.

桑树光秃秃的,田野也是片荒凉.

互联网摘选

Harmonic control and reactive power compensation is the important problem which need to solve urgently. Currently, method generally choose hybrid electric power filter system which combinate static reactive compensation ( SVC) and active filter ( APF).

谐波抑制和无功补偿是当前电力系统中迫切需要解决的问题，目前一般是采用静止无功补偿（SVC）和有源滤波（APF）相结合的混合型电力滤波系统。

互联网摘选

The characteris-tics and the basic principles of active power filtering technology are introduced in brief, and then the main control strategy of APF is introduced as well as some considerations for the application of APF at last.

首先简要介绍电力有源滤波技术的特点、基本原理，然后介绍APF的主要控制策略，最后对APF技术应用中应考虑的一些问题作简单介绍。

互联网摘选

Increase signal to noise ratio and so increase anti interference capability and appreciation accuracy of the G N Line Determination Meter.

在采用有源滤波的基础上，进一步利用数字滤波和对输入信号线性累加的软件处理，提高了信噪比，从而提高了G-N线检测仪的抗干扰能力和判断的准确度。

互联网摘选

This paper presents a kind of voltage-mode single-phase active power filter based on DSP technology. The structure of main loop and the computation method of reactive power and harmonics current as well as the stably controlling method of the capacitor voltage are illustrated.

介绍一种基于DSP技术的单相电压型有源滤波装置（APF），阐述了该装置的主电路结构、需要补偿的无功及谐波电流计算方法及电容电压稳定控制方法。

互联网摘选

The active filtering circuit by this design enjoys low sensitivities character of the passive ladder network prototype. Design example of five-order elliptic high-pass filter and its PSPICE simulation result are also given.

用该方法设计的有源滤波电路具有无源梯形网络原型的低灵敏度特性，给出了五阶椭圆高通滤波器的设计例子和PSPICE仿真结果。

互联网摘选

As a result, this sort of antenna can be used to focus HPM operating waves or reflect transgressive HPM waves on the bass of forming passive filter device.

该天线根据需要可聚束HPM工作波，也可将外来入侵的HPM波聚束后发送回原处，可形成空间有源滤波等器件。

互联网摘选

The Unified Power Quality Conditioner ( UPQC) is an important represent in the active power filter family.

统一电能质量调节器（UPQC）是有源滤波家族中的重要代表。

互联网摘选

On the basis of control system CAD and engineering experiences of circuit design, the paper presents a kind of practical optimum CAD method to design active filter and correction network circuits, which have been widely used in continuous minimum phase control systems.

在控制系统CAD和实际电路设计经验基础上，针对广泛使用的连续控制系统中有源滤波和校正网络电路的工程设计，提出了一种实用的优化设计CAD方法。

互联网摘选

The simulation results through MATLAB confirm the control methods under different compensating functions, and rapid response and validity of the control system, and also good compensating performance of medium-voltage SVG with active filter function.

通过MATLAB仿真研究验证了所提出的各种补偿功能下的控制方法，并证实了该控制系统的快速性和有效性，以及有源滤波型中压SVG的良好补偿性能。

互联网摘选

Integrated Parameter Optimization Design of Series Hybrid Active Power Filter The design method of output filter ( OF) mainly depend on engineering experience, that does not include the influence of OF to the compensating ability and property of the whole system.

串联混合型有源滤波系统的整体优化设计现有的输出滤波器（Output Filter，OF）参数设计大多以工程经验选取为主，没有考虑输出滤波对有源滤波系统的补偿能力和补偿性能的影响。

互联网摘选

This dissertation put forward a preliminary plan that an online uninterruptible power system has active-filter function with DSP control. The system has active-filter and UPS functions.

本文提出一种将电力有源滤波技术APF与不间断电源相结合的UPS电源系统解决方案，此系统兼有APF和UPS功能。

互联网摘选

Passive way, which means to add compensation equipment outside, for example, to introduce LC filters or active power filters ( APF) in power system.

被动型，即外加补偿装置，比如在电力系统中加LC滤波器，或加有源滤波装置等。

互联网摘选

Experimental results demonstrate that the id 、 iq method based on instantaneous reactive theory can both detect the harmonic current of nonlinear load, and obtain the reactive current rapidly.

实验结果表明，采用i d、i q法能够实时、准确地检测出非线性负载的谐波电流和无功电流，为有源滤波技术的实现奠定了基础。

互联网摘选

A new active power filter and static var compensator is investigated, the digital control algorithm and its software flow chart are given in view of digital signal processor ( DSP).

研制出一种新型电力有源滤波及无功补偿装置，给出了基于DSP微处理器的数字控制算法。

互联网摘选

Using the MATLAB, this paper introduces an application in harmonics and reactive-current compensation for an active filter system, which based on the adaptive simulink in signal prediction.

本设计运用MATLAB语言实现信号预测模型的自适应仿真在有源滤波系统的谐波和无功电流补偿中的应用。

互联网摘选

A new restraining network method for analysing the network with operational amplifier is investigated in detail, taking RC active filter as a sample.

以RC有源滤波电路为例，介绍了一种对含有运算放大器网络进行分析的新的约束网络法，并对其进行了较细致的研究。

互联网摘选

The design method of an active SAW filter module with low frequency and high stopband rejection is introduced in this paper. The performances of the module developed recently are also given.

介绍了一种低频高阻带抑制SAW有源滤波组件的设计方法，并介绍了最新研制的滤波组件的性能。

互联网摘选

EWB simulation design of active filter circuit with frequency division multiplex

频分复用有源滤波电路的EWB仿真设计

互联网摘选

PI controller is usually the core of control, but there is the limitation of pure PI controller in active filtering.

电流环数字控制器通常以PI调节器为控制核心，但纯PI调节器在有源滤波中存在一定的局限性。

互联网摘选