非正交解耦理论与集成于整流变压器的线性电抗器

文中将空间非正交布置的两绕组间,有磁场耦合但没有功率耦合的一类电磁现象定义为非正交解耦。电力工程中的空心电抗器具有线性特性和低噪音的优点,也具有空间占用大的缺点。在舰船、城市配网等需要滤波的变电站中,特别既希望采用空心电抗器,又不希望有太多的空间占用。基于上述非正交解耦理论构造的集成于变压器的线性电抗器,可以满足此要求。制造了由6脉波二极管整流,300 k VA、6 300 V/720 V集成线性电抗器的整流变压器,滤波侧5、7、11次单调谐滤波器,构成的样机系统。样机系统实验表明非正交解耦理论正确,基于非正交解耦理论构造的集成于整流变压器的线性电抗器具有与变压器其他绕组解耦、线性、不占用额外空间、不增加噪音等显著特点。

非线性电抗器的数学模型与等效电路

提出了用幂函数和指数函数构造给定磁化曲线的拟合函数，详述了基子广义最小二乘法求拟合函数待定系数的方法，导出了可饱和电抗器的数学模型和等效电路。其计算过程简单、物理概念清晰、易于实现且拟合效果好，仿真结果证明了它的可行性。

电抗移相相复励励磁系统原理及设计

图1是常用的电抗移相相复励励磁系统(下简称相复励)线路图。电流互感器(4)付边提供的电压,与负载电流相对应,线性电抗器(3)把电枢绕组抽头电压或端电压移相约90°,和(4)提供的电压几何相加,经过桥式整流器(5)整流。给发电机的励磁绕组(2)供电。当发电机空载时,通过线性电抗器(3)提供励磁电源,建立空载电压;负载时,由(4)供给所需要的复励电流,进行电流补偿,由(3)移相,进行相位补偿,从而抵销负载电流电枢反应的去磁作用,保持电机端电压恒定。

一种软开关式功率变换器的研究

介绍一种采用非线性电抗器作为谐振元件的软开关式功率变换器电路，对其工作原理进行了详细分析，给出了非线性电抗器的设计方法，并且通过实验对理论分析加以验证。

Accurate Reactive Power Controller and Power Factor Correction Using Fuzzy Logic

This paper presents the use of fuzzy logic technique to control the reactive power of load and hence improve the source power factor. A shunt compensator is proposed, which consists of a voltage controlled reactor by full-wave thyristor bridge in parallel with a capacitor. The proposed voltage control technique composed of two independent fuzzy controllers, primary and secondary. The PFC （primary fuzzy controller） is designed based on linearization method to introduce to the network the nearest value of reactive power （VAR） required to correct the power factor. The SFC （secondary fuzzy controller） is designed to achieve accurate compensation for the required VAR to achieve the pre-set power factor value. Simulations for 15 different practical study cases are presented to evaluate the performance of the controller, and the results show how the designed controller is fast and accurate. Harmonics analyses are carried out up to the 13th harmonic to determine the requirement of harmonics filter.