用于新能源送出的M3C工频电网故障穿越方法研究  

Research of the Power Frequency Grid Fault Ride⁃through Strategy of Modular Multi⁃level Matrix Converter for New Energy Transmission

作　　者：董钺 何迎飞 杜路路 汤明杰 靳广超 赵儆 DONG Yue;HE Yingfei;DU Lulu;TANG Mingjie;JIN Guangchao;ZHAO Jing(TBEA Science&Technology Investment Co.,Ltd.,Tianjin 301700,China;TBEA Xi’an Flexible Power T&D Co.,Ltd.,Xi’an 710119,Shaanxi,China)

机构地区：[1]特变电工科技投资有限公司,天津301700 [2]特变电工西安柔性输配电有限公司,陕西西安710119

出　　处：《电气传动》2024年第9期71-82,共12页Electric Drive

基　　金：国家电网公司科技项目(4000-202155368A-0-0-00)。

摘　　要：模块化多电平矩阵式变换器(M3C)是一种可实现不同频率电能直接交-交变换的新型拓扑,适用于高压大容量场合。在分频输电系统中,为实现M3C工频故障可靠穿越,提出完整的故障穿越流程。首先对工频侧和分频侧电压不对称时M3C在双α-β坐标系下的桥臂功率状态方程进行推导,然后提出根据各子模块电压平均值在分频侧投入卸荷电阻的策略来消耗低频侧的过剩功率,并根据电网电压正序分量的跌落程度和负序分量输出对应的正序和负序无功电流。此外,当电网电压正序分量过低时,将对角均压从工频侧切换至分频侧,在故障穿越过程中保证各桥臂子模块电压之间的均衡。最后,在Matlab/Simulink仿真平台上,对3.3 kV/3.3 kV/3 MV·A M3C工程样机工频故障穿越方法的有效性进行了验证。Modular multi-level matrix converter(M3C)is a kind of new topology which can convert one specified electric frequency to another directly,it is applicable to high voltage and large capacity scene.In the fractional transmission system,the complete flow was introduced to achieve power frequency grid fault ridethrough.The arm power state equation of M3C in doubleα-βframe was introduced when power frequency voltage and fractional frequency voltage is unsymmetrical.The control strategy of switching on braking resistor in the fractional frequency side based on the average voltage of all sub-module capacitor was introduced,in order to consume redundant power in the fractional frequency side.Positive and negative sequence reactive current based on the power frequency positive voltage dips and negative voltage component were output.In addition,when power frequency positive sequence voltage is too low,diagonal balancing control was converted to the fractional frequency side from the power frequency side,which can realize the balance of all arm sub-module capacitor voltage in the process of power frequency grid fault ride-though.At last,a 3.3 kV/3.3 kV/3 MV·A M3C model was built in Matlab/Simulink,the effectiveness of power frequency grid fault ride-through strategy was validated.

关 键 词：模块化多电平矩阵式变换器 工频电网故障穿越 卸荷电阻 均衡控制 

分 类 号：TM28[一般工业技术—材料科学与工程]