基于SVPWM扇区号的三相变流器开路故障诊断  

Open-circuit fault diagnosis of three phase converter based on SVPWM sector number

作　　者：孙超 邱颖宁[1] 冯延晖[1] SUN Chao;QIU Yingning;FENG Yanhui(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《电力工程技术》2020年第2期178-185,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51505225);江苏省自然科学基金资助项目(BK20131350);江苏省绿色船舶技术重点实验室基金项目(2019Z05)。

摘　　要：功率变流器是风力发电系统中电能变换传输的重要部件,其开路故障会造成风力发电系统非计划停机,因此对功率变流器开路故障的及时诊断尤为重要。文中分析了空间矢量脉冲宽度调制(SVPWM)在功率开关管发生开路故障前后其扇区受影响状况,以及基本电压空间矢量的变化。根据功率开关管故障前后SVPWM调制时扇区号的对比,提出一种能够对功率开关管开路故障进行判断以及定位的方法。相比于已有的诊断方法,该方法能够实现单管以及双管开路故障诊断,只需采集SVPWM调制时的扇区号单一变量,不需要增加额外的硬件设备,数据存储要求低,计算量小,易于实现。最后通过仿真及实验验证了该开路故障诊断方法的有效性与可行性。Power converters are important components of power conversion transmission in wind power generation systems,and open circuit failures can cause unplanned downtime of wind power generation systems,so it is especially important to diagnose the open fault of the power converter.In this paper,the influence of space vector pulse width modulation(SVPWM)on the sector affected by the open circuit fault of the power switch and the change of the basic voltage space vector are analyzed.In this paper,according to the comparison of the sector numbers of SVPWM modulation before and after the failure of the power switch,a method for judging and locating the open circuit fault of the power switch is proposed.Compared with the existing diagnostic methods,the method can realize single-switch and double-switch open-circuit fault diagnosis,and only needs to collect a single variable of the sector number in SVPWM modulation,without adding additional hardware equipment,low data storage requirements,simple calculation and easy to implement.Finally,the effectiveness and feasibility of the proposed open circuit fault diagnosis method are verified by simulation and experiment.

关 键 词：功率变流器 风力发电 空间矢量脉冲宽度调制 扇区号 开路故障诊断 

分 类 号：TM46[电气工程—电器]