查询词典 harmonic component

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。

Formula of the first order component of the harmonic current at saturation is obtained.

这个公式表明：考虑空间电荷波时，在小信号和辐射波与空间电荷波同相的条件下，它将增强谐波电流。

The relationship between barotropic tidal currents and sea level were established for the first 45-day period using the transfer functions and harmonic analysis, and then carry the prediction for the second 45-day period. There is very good agreement between the observed and predicted semidiurnal tidal current, the rms error is less than 3 cm s-1. However, prediction on diurnal tidal current is rather disappointing, the rms error is about 19 cm s-1, suggesting strong baroclinic tidal component may have a significant contribution to the tidal current, which is not registered in the sea level records.

利用转换函数与调和分析两种方法，验证水位预报正压潮流的可行性，将观测资料分为等长的两段时期，藉由第一段时期约45天的正压潮流与水位的关系，预报下一段时期约45天的正压潮流，结果显示半日潮流的观测值与预报值大致符合，其均方根约在3公分/秒以下；但是全日潮流的观测值与预报值的差异大，其均方根最大可达到约19公分/秒，推测其原因为斜压潮分量大而影响潮流，但是不会对水位资料造成影响。

In SHET, equations which represent relation of fundamental component and preparatory eliminated harmonic components are a system of nonlinear, transcendental equations that require the interative Newton-Raphson matrix method for its solution, and convergence in solution depends on whether or not starting value given is right.

特定消谐技术中，表征基波及各次谐波幅值与开关角关系的方程组为非线性超越方程组，一般只能采用牛顿迭代法等数值方法求解，而解的收敛性取决于所给初值的正确与否。

The frequency spectrum is composed by not the continual spectral line,each spectral line represents a harmonic component.

频谱是由不连续的谱线组成，每条谱线代表一个谐波分量。

According to the three component absolute survey data of 118 geomagnetic stations observed during 1998~2000 and 39 geomagnetic observatories and IGRF 2000, the spherical cap harmonic models of the geomagnetic field for 2000 (the truncation order is 8), and the geomagnetic secular variation for 2000~2005 (the truncation oder is 6) are calculated.

根据1998～2000年完成的118个地磁测点和39个地磁台的三分量绝对测量资料以及IGRF2000，计算2000年中国地磁场冠谐模型（截断阶数为8），以及2000～2005年中国地磁长期变化冠谐模型（截断阶数为6）。

The relation of trapezoidal wave slope angle to amplitude of output fundamental component and harmonic content is deduced.

推导了梯形波边坡角与输出基波幅值和谐波含量的关系。

The composition theorem based on the nonsymmetrical interfaces was proved, in terms of which any two components interacting by harmonic interfaces could be combined into a single component.

第二，系统地建立了构件与接口、接口与接口的关系理论，明确了接口&和谐&交互的条件及构件&提供&接口的含义。

If the frequency of a laser is modulated sinusoidally, the first harmonic component of saturated absorption signal can be used as error signal to stabilize the frequency of the laser.

对激光器进行频率调制，检测原子分子饱和吸收信号中的一次谐波成分得到频率误差信号，反馈控制可以实现激光频率的稳定。

The theory is analyzed of restraining harmonic component and saving energy by means of using △-Y mixed winding on the three phase asynchronous motor .

分析了三相异步电动机采用△-Y混合绕组型式抑制高次谐波和降低电机损耗的原理。

Use nationalization degree and the relationship that commercialize degree, condition of calculable market economy plays scope of optimal and state-owned economy.

利用国有化程度与市场化程度的关系，可计算市场经济条件下最佳国有经济规模。

The kinds of extractant also effected desulfurization rate .

萃取剂对脱硫率的影响也很大，乙二胺的萃取效果优于甲醇的。