无功的

The impact of parallel operation of wind turbines on power flow is analyzed, in which the squirrel cage induction motors are used as the constant speed wind turbine and the double fed induction motors are used as variable speed wind turbine.

分析了以鼠笼感应电机作为发电机的定速风电机组和以双馈感应电机作为发电机的变速风电机组并网运行对系统潮流的影响，并对不同控制模式下使用双馈感应电机的变速风电机组的电压和无功控制特性进行了比较。

Based on the compensate admittance model of Steinmetz theory a method is put forward which use instantaneous values of load current and voltage to denote it. The simulations and practical application in the design of SVC model have shown that the proposed method is very effective, accurate, and with fast response performance.

本文基于不平衡负荷的平衡化原理(即Steinmetz原理)的补偿导纳模型，采用负荷电流电压瞬时值采样的方法补偿无功功率，并将该方法应用于SVC样机的设计，结果表明，它们是快速有效和准确的，具有实际的工程应用价值。

The MATLAB simulation software is used to model the harmonics detection circuit, which is based on the instantaneous reactive power theory.

通过对基于瞬时无功功率理论的一种谐波电流检测方法的研究，利用MATLAB仿真软件建立了相应的仿真电路，就其中的低通滤波器对谐波电流检测效果的影响进行了仿真研究。

After a short-term load forecasting method based analogous and linear extrapolation is proposed, the load forecast and the priority of equipment action are led into static reactive power optimization. The aim function is constructed for the practical situation of power system. On the basis of traditional genetic algorithm the fitness function and the holding of population diversity are improved. The adjacent search operator is applied to improve ability of local search.

在提出基于相似日和线性外推的短期负荷预测新方法的基础上，将负荷预测和设备动作优先级引入静态无功优化中，并结合电网实际情况，构造了实用的目标函数，对遗传算法的适应度函数和群体多样性的保持进行了改进，采用邻域搜索算子增加遗传算法的局部寻优能力。

The main body of a book have analysed a generator losing the magnetism physics process , have given a generator out the fundamental equation losing the magnetism queen; By using simulated module of electric system in Matlab/Simulink,build a single infinity system emulation model , have included module such as generator , excitation system , transformer , idle work power source , circuit loads , infinity system , transmission line; Lose magnetism condition two kinds specifically for the excitation winding loses magnetism and the part completely losing magnetism, lower emulation having carried out different working condition, have gained machine holding stater voltage , have encouraged the magnetoelectricity stream , excitation voltage and output having performed meritorious service power wave form change condition; By simulated wave form of contrast , to every electricity amounts, change law has carried out theoretical analysis.

本文分析了发电机失磁的物理过程，给出了发电机失磁后的基本方程；通过使用Matlab/Simulink中的电力系统仿真模块，建立一个单机无穷大系统仿真模型，包括了发电机、励磁系统、变压器、无功电源、线路负载、无穷大系统、输电线路等模块；针对励磁绕组完全失磁和部分失磁两种失磁情况，进行了不同工况下的仿真，获得了机端定子电压、励磁电流、励磁电压和输出有功功率波形的变化情况；通过对比仿真波形，对各电气量变化规律进行了理论分析。

The improved algorithm supplied the exact reference phase for current d-q transformation,then detection accuracy of the algorithm wasn t influenced by voltage distortion,so it can detect the harmonic and reactive component of load current effectively.

该改进算法为电流的d-q变换提供精确的参考相位。采用改进的检测算法，电压畸变不会影响该算法检测的精确度，并能有效地检测负载电流的谐波与无功分量。

Sometimes the series and shunt syntony with main system would enlarge harmonics and make things worse. Active Power Filter, as another kind of filter equipment, begin to make use following the advancement of GTR,GTO, IGBT and etc. Theunique advantage of this new setting is dynamic harmonics canceling. Now, the shunt APF is the most widely used one.

进入80年代以后，随着有源滤波技术的不断深入和用户对谐波问题的重视，以及电力电子技术的飞速发展，大功率可关断器件(GTR，GTO，IGBT等)的不断进步，有源电力滤波器(Active Power Filter， APF)作为抑制电网谐波、补偿供电系统无功功率的新型电力电子装置得到迅速发展，其中又以并联型有源电力滤波器的使用最为广泛。

Then the voltage source type matrix converter mathematics model is established each in 3-phase static and circumrotate coordinate system, moreover by open-loop simulation, the simulation results show that the voltage source type matrix converter can realize the frequency range very broad sine wave input-output, moreover by regulating circuit parameter, the power factor in input side reaches 1 approximately, realization static VAR compensator function.

然后分别建立了电压源型矩阵变换器在三相坐标系和旋转坐标系下的数学模型，并且对电压源型矩阵变换器进行开环仿真，仿真的结果表明电压源型矩阵变换器能够实现频率范围很广的正弦波输入输出，而且通过调整电路参数使得输入侧的功率因数约为1，实现静止无功补偿器的功能。

Its thermodynamic characteristic is gimilar to R410A. Contrast experiments by air enthalpy difference method are performed. Experimental results indicate that without modification to system components, cycle performances of M3 are close to R410A. Its cooling capacity is slightly smaller than R410A. It has a greater COP and low power consumpt...

在标准的空气焓差实验台上对M3、R410A进行了对比实验，实验结果表明，在不改动系统部件的情况下，新工质M3可保证R410A系统的循环性能基本无大的变化，其循环性能接近R410A，制冷量稍小，但COP值大，耗功少，具有替代新系统中R410A的潜力。

The invention ensures that the SVC can not only complete the unbalanced load equalization compensation but also control the stabilization, thereby raising the precision of the susceptance computation of the SVC, guaranteeing the balance compensation of the charge, improving the performance in the stabilization control of the SVC voltage and maintaining the voltage stabilization of a common connection joint.

本发明能让其中SVC既能进行不平衡负荷平衡化补偿，又能对稳定控制，提高了静止无功补偿器电纳计算的精度，确保负荷的平衡补偿，改善了SVC电压稳定控制时的性能，维持公共连接点的电压稳定，具有较高的鲁棒性和响应速度。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷