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The definition of instantaneous reactive power in sinusoidal circuit is still a pending problem and should be studied further. The authors consider that the theory of instantaneous power should be studied on the basis of the original definitions of instantaneous active and reactive power.

针对研究近一个世纪还没有解决的瞬时无功功率界定与定义的问题，该文认为应从原始瞬时有功功率、瞬时无功功率界定来研究瞬时功率理论。

In order to ensure that self-compensating devices for reactive power work stably and reliably in low-voltage electric power system, this paper introduces a new method and steps of selecting compensating devices by comparing their types, based on the theory of reactive power in non-sinusoidal alternating circuit.

产生谐波的根本原因是电力系统中器件、设备的非线性，即使供给这些器件、设备的电源是理想的正弦波形电压，电网供给它们的电流也是非正弦波形，即产生了谐波电流，当谐波电流流过线路后，产生谐波压降，使电网电压失真。

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。

When a power failure has occurred, the recording head is demagnetized with power in case of a power failure.

当电源故障已经发生时，用在电源故障情况下的电力去磁记录磁头。

Solution: For regular power supply instability, we can purchase UPS or 130-260V power supply for wide computer switching power supply to ensure stability.

解决方法：对于经常性供电不稳的地区，我们可以购置UPS电源或130－260V的宽幅开关电源来保证计算机稳定工作。

With the development of electric power industry and the increase of large-scale substation, the requirement of protection and control of power system is getting higher, and the computer relay protection of power system is also developed with the techniques of intelligent computer, networking and integration.

随着电力工业的发展和大面积多变电所用户的急剧增加，对电力系统的保护及监控提出了更高的要求，电力系统微机继电保护向智能化、网络化和集成化方向发展。

So the legality of executive power 、the respect to executive power by the society and the relief control of executive power constitute the basic theory of the determination of executive act.

由此可见，行政行为具有一些不同于民事行为的特权，即使其有瑕疵，但在被有权机关撤销以前，也仍然被推定为合法有效。

Globalization poses a serious challenge to the state sovereignty, power rightfulness, and power efficiency of those countries whose civil politics are still underdeveloped. It weakens the many aspects of the legitimacy of the state power of these countries, including its scope, intensity, forms, institutional foundation, and ideology.

全球化的发展对公民政治尚不健全的国家的主权、权力正当性和权力效能提出了严峻的挑战，影响甚至削弱了这些国家权力合法性的许多方面，如权力的范围、强度、形式、制度基础和意识形态观念。

For spectral analysis of high-voltage power supply (for example, photomultiplier tube power supply), low ripple is especially important, the indicator will directly affect the accuracy of measurement, the low ripple, the production of micro-East cultural pressure high voltage power supply, the ripple can be control 0.005%.

用于光谱分析的高压电源，低纹波尤其重要，该指标会直接影响分析测量的精度，就低纹波而言，东文高压生产的微型高压电源，纹波可控制在0.005%。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。