具有低谐波的新型三相磁阀式可控电抗器

New Three-Phase Magnetically Controlled Reactor with Low Harmonic

针对目前三相磁控电抗器(magnetically controlled reactor,MCR)谐波含量偏高的问题,提出了一种采用分离式双级铁心磁阀结构的新型三相MCR,由2个具有不同截面积和不同长度的两级铁心构成,利用两级磁阀在动态工作调节过程中,因磁饱和度不同而产生不同相位的谐波电流实现相互补偿的原理,达到减小MCR输出电流中所含谐波的目的。以三相MCR中5次和7次谐波抑制研究为目标,建立了以2个截面面积和长度为主要参数的谐波特性数学模型,对参数进行了优化设计。结果表明新型三相MCR可使得5次和7次谐波含量峰值理论上不超过额定输出电流的0.77%和0.6%。建立了仿真模型,仿真波形和理论波形相一致,验证了抑制谐波的有效性。

Aiming at the problem of high harmonic content of three-phase magnetically controlled reactor （ MCR）, a novel three-phase MCR with separating two-stage magnetic valve structure was proposed, which was composed of two-stage iron cores with different area and length. In the dynamic process of adjustment, due to different magnetic saturation of the two-stage magnetic valve, it could produce different phase harmonic current, which could be mutual compensated, so the output harmonic current of MCR could be reduced. Taking the suppression of the 5 and 7 harmonics of three-phase MCR as study target, a mathematical model of the harmonic characteristics was established, which used two section areas and lengths as main parameters, and the parameters were designed and optimized. The results show that： the 5 and 7 harmonics peak in new three-phase MCR can do not exceed the rated output current of 0. 77% and 0. 6% in theory. Finally, the simulation model was established, and the simulation waveform was the same as the theoretical waveform, which could verify the effectiveness of harmonic suppression.