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For accurate measurement of reactive power in non-sinusoidal circuit, this article introduces a method integrating quasi-synchronous sampling theory with digital-phase-shift network..

在给定定义下,为了准确测量全无功电能,本文介绍了一种结合准同步算法和离散Hilbert的无功测量方法。

College of Electrical Engineering, Zhengzhou University摘要: In order to understand and calculate the reactive power of the nonsinusoidal electric circuit accurately and analyses the the influence of the reactive power in the nonsinusoidal electric circuit on reactive energy measurement .the calculation formula of the reactive power is concluded by means of the Fourier analysis method.

为了能够准确地理解和计算非正弦电路的无功功率,分析非正弦无功对无功电能计量的影响,本文采用傅立叶分析方法,导出非正弦电路的无功功率的计算公式,分析了公式中每一项的物理意义。

The technique made full use of the characteristic of PR controller which can realize zero steady-state error in AC input signal in stationary frame. In the method, the active and reactive current component in the vector control strategy were transformed in the stationary frame to achieve the objective of keeping the DC-link voltage constant, adjusting the power factor and decoupling the active and reactive power. Compared with conventional double close-loop proportional integral controller, the PR technique is better in harmonic compensation without the complex rotating frame transformation and the couple or feedback voltage which is easily influenced by temperature and circuit parameters. The control algorithm is easy to be realized while the robustness and power quality is improved.

该方法充分利用了PR控制器能够在静止坐标系下对交流输入信号无静差控制的优势,将矢量控制策略下的有功电流和无功电流分量转换到静止坐标系下进行调节,实现网侧变换器维持直流电压稳定和调节功率因数的控制任务和双馈电机有功、无功功率的解耦控制,与传统的双闭环PI控制相比,该策略无需繁琐的坐标旋转变换,不存在受温度及电路参数影响的耦合项和前馈补偿项,且易于实现对系统低次谐波电流的补偿,减小了控制算法实现难度,提高了控制系统的鲁棒性和电网电能质量。

Itsmeasurement accuracywas verified by the three phase p recision test power equipment, and the result shows that themeasuring instrument has highermeasuring accuracy.

实验结果表明:该仪表具有较高的测量精度,可以满足电能测量的精度要求以及电力设备实时监控方面的要求。

In this paper, a new design of the triggercircuits of the Silicon Controlled Rectifier is Presented.

一、概述可控硅是大功率电能转换与控制领域中的常用元件之一。

The invention concerns a vibration damping device comprising an element converting mechanical energy into electrical power mounted on a base designed to be fixed on a structure to be damped. Said converting element comprises an electrodynamic motor including a coil (20) mechanically connected to the base (1) and a magnetic circuit suspended by at least a spring (22), and the coil (20) is coupled with an electric charge having a resistive component and it includes a control device for varying the value of said resistive component based on at least two values.

本发明涉及一减震装置,所述装置包括一种把机械能转换为电能的能量转换装置,所述装置可安装在待减震结构的底座上,其特征在于,所述转换装置包括一电动机,所述电动机有一线圈(20)及一磁路,所述线圈采用机械方式连接底座(1),所述磁路通过至少一根弹簧(22)悬置着,线圈(20)耦合着一具有一电阻元件的电载荷,并具有一控制装置,用于按至少两个值来改变所述电阻元件的阻值。

In the system setup,a tapered resonance tube is used to meet the coupling requirements on the volume flow rate and phase between the engine and the alternator.

热声发动机将热能转化为声功,再利用直线发电机将声功转化成电能,从而完成热到电的转化。

Electrical energy is not required for this resonator since it is powered by the energy of the person wearing it.

电能是不需要这种共鸣,因为它是由能源的人穿着。

It has been proved that using interharmonics analysis method to treat electric energy quality in rolling mill is an ...

从而证明,利用中间谐波分析方法,治理轧钢厂电能质量,是一种国内先进的方法。

Imp roving the power quality for customers is one of the main purposes of research on smartgrid.

提高用户电能质量是当前智能电网研究的主要目标之一。

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