作　　者： ; ; ; ;

机构地区： 华北电力大学电气与电子工程学院电力工程系

出　　处： 《电力自动化设备》 2006年第8期33-35,共3页

摘　　要： 目前,广泛应用于无功补偿的电容器不能连续地进行无功补偿,当无功负荷经常变化时,电容器的频繁投切会给电网及其自身带来一系列问题。阐述了一种基于负阻抗变换器NIC(NegativeImpedance Converter)特性的新型无功补偿器的工作原理及电路结构,在此基础上提出一种通过NIC将电感转换为可连续调节的电容的方法。该方法补偿的关键在于NIC可以将电感转变成电容。在NIC的输出端口连接电感,在NIC的输入端口变成等效电容,通过连续改变NIC同相输入端电阻的阻值实现对等效电容的电容值的连续调节。通过具体的电路模型验证了预期补偿效果,并用Workbench对其进行仿真。结果表明,该无功补偿器可以连续调节无功大小,使功率因数稳定在0.93～0.96。 Because capacitors used in var compensation can not change continuously,when load fluctuates,frequent switching of capacitor may result in troubles to power system and itself. The working principle and structure of the reactive power compensator based on NIC （Negative Impedance Converter） are introduced. A method to convert inductance into continuously adjustable capacitance via NIC is put forward,which is the key technique of NIC-based reactive power compensator. The inductor connected to the output port of NIC is equivalent to a capacitor at the input port,and its value changes continuously according to the continuously changeable resistance connected to the input port at the same phase. Detail circuit model is built up and simulated with Workbench to validate the expected compensation effect. Results show that the reactive power can be adjusted continuously and the power factor can be controlled between 0.93 and 0.96.

关 键 词： 负阻抗变换器 无功补偿 可调电容器

领　　域： [电气工程]