高压大功率整流电路.docVIP

高压大功率整流电路 输入电流偕波抑制技术与发展趋势 摘　要：当电动机容量较大时，大功率变频器的输入谐波对电网的影响以及输出谐波对电动机的影响成为了交流变频系统中突出的问题。为了减小大功率变频器的谐波，普遍采用多脉动整流、变压器耦合输出、多电平和单元级联技术，形成了以多脉动整流拓扑或多电平拓扑为输入级、以变压器耦合输出或多电平输出拓扑为输出级的大功率变频器主电路，以及多重化结构的大功率变频器主电路。本文对目前几种有代表性的高压变频器主电路拓扑及输入输出谐波进行了分析，并与IEEE-519标准进行比较，研究了变频器的谐波特性The high-pressured high efficiency leveling circuit input current accompanies the wave to suppress the technology and the trend of development Shandong industry and commerce institute letter electricity instituteAbstract: When the electric motor capacity is big, high efficiency frequency changers input overtone to electrical network influence as well as output overtone to electric motor in influence into exchange frequency conversion system prominent question. In order to reduce the high efficiency frequency changers overtone, uses the multi-pulsation rectification, the transformer coupling output, the multi-levels and the unit cascade technology generally, has formed take the multi-pulsation rectification analysis situs either the multi-level analysis situs as the input level, outputs the analysis situs take the transformer coupling output or the multi-levels as the output stage high efficiency frequency changer main circuit, as well as multi-densified structure high efficiency frequency changer main circuit. This article had the representative high-pressured frequency changer main circuit analysis situs and the input output overtone to the present several kinds has carried on the analysis, and carried on the comparison with the IEEE-519 standard, has studied frequency changers overtone characteristic. And has pointed out the harmonic suppression technology trend of development. key words: Multi-densification Multi-levels Unit cascade Transformer coupling output 引言,具有重大的经济效益,因此,高压大功率变频调速技术的研究已发展成为各国节能事业的主导方向之一。电力电子变流电路仍然是变频技术的核心,由于电力电子器件都工作于开关状态,由这些电路构成的装置已成为电力系统中的主要谐波源,变频器输出的谐波电流会引起谐振和谐波电流放大,危害旋转电机和变压器,影响继电保护和电力测量准确性。近年来,围绕抑制谐波电流,研究人员在电路结构和控制技术等方面提出了不同的整流和逆变方案,形成了多样化的大功率变频技术。IEEE-5