有功功率

From the perspective of minimum transmission losses, an instantaneous reactive power theory for systems with any number of phases and with or without neutral line is developed. Under the new definition, each quantity has its own physical meaning, and the zero sequence current can be decomposed into active and reactive components. Furthermore, a generalized compensation method for zero sequence current is developed.

从输电损耗最小的角度出发，提出了任意相无中性线或有中性线系统的瞬时无功功率理论，在新的理论下，每个量都有清晰的物理意义，且能分解出零序电流的有功分量和无功分量，并给出了通用的零序电流补偿方法，揭示了瞬时无功功率理论与传统平均意义下的无功功率理论的联系及本质区别，从而为研究HVDC-VSC及各种FACTS装置的无功功率控制奠定了理论基础。

It calculates the active power and reactive power of the net side of the rectification system on-line, which based on the three-phase circuit instantaneous reactive power theory. To provide fast and accurate real-time measurements of active and reactive for new type static var compensators, this paper designs a optimization digital low-pass filter with the approach by combining the Butterworth filters with mean filter.

基于改进的瞬时无功功率理论，在线计算整流系统网侧有功和无功功率，将Butterworth滤波器和均值滤波器相结合，优化设计高性能的数字低通滤波器，为新型SVC提供快速而准确的有功与无功在线测量值。

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。

To realize better performance of share current, a method is present to restrain the circumfluence.

采用有功和无功的并联控制理论，对各并联单元输出有功、无功功率进行分别控制。

Based on digital signal processing chip energy metering, and measurement of positive and negative functions of active power.

详细说明：基于数字信号处理的电能计量芯片，有测量正向和负向有功功率的功能。

UPM303 replaces multiple analog meters as well as single function meters such as voltmeters, ammeters, wattmeters, etc.

UPM304可替代许多指针表，如电压表，电流表，有功功率表等单一功能仪表。

The problem of phase order in transformer substation s erection;2. The wire linking is completely checked by active power value,reactive power value,mutual inductor polarity, phase order and the link of detecting instruments.

分析了功率测量的基本原理、判断错接线的方法，提出用有功测量值来判断接线的正确性是不全面的，应从有功测量值、无功测量值、互感器极性和相序以及测量仪器的接线判断接线的正误。

And also,the method to reliability coefficient calculation is put forward.

近几年，随着河南电网结构的发展以及负荷的迅速增长，根据计算，一些220kV线路的最大有功功率可能达到650MW。

The application of hydropower plant's AGC is the key to power system's AGC.

水电厂易于改变有功功率的输出值，是电力系统自动发电控制的主要执行者。

The active power increase allows a faster melt in the electric arc furnace, thereby saving energy consumption.

有功功率的增加，使电弧炉中的物料熔化更快，从而节约能耗。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。