摘要
传导干扰被广泛视为高压变频器电磁干扰(EMI)测试中主要的电流噪声来源,而EMI滤波器则被认为是抑制此类干扰最有效的技术手段之一。针对现有高压电源EMI滤波器未覆盖输出端传导干扰路径、难以满足矿用高压变频器电磁兼容(EMC)测试时输出端EMI抑制实际需求的问题,根据正弦脉宽调制(SPWM)方式下的高压变频器输出特性,设计了一种π型结构的单相10kV高压电源EMI滤波器。分析了电动机及其高压电缆对变频器共模与差模干扰的影响机制,构建了驱动系统的干扰传导路径模型。结合高频谐波特性,考虑插入损耗、漏电流、阻抗匹配、耐压安全裕度及结构尺寸约束等,选择π型(CLC)EMI滤波器作为高压电源输出端的滤波方案,确定了EMI滤波器关键器件及其参数:采用陶瓷电容,电容器的对地电容为20 nF;选用磁芯电感器及低损耗磁性材料——非晶纳米晶合金磁环,滤波电感为20μH。开展工频耐压、局部放电、温升、插入损耗及传导干扰实测验证,结果表明,该滤波器在0.15~2 MHz频段内可有效抑制传导干扰,最大衰减达62.3 dB,具备优良的传导干扰抑制能力与热稳定性。
Conducted interference is widely regarded as the main source of current noise in Electromagnetic Interference(EMI)testing of high-voltage frequency converters,while EMI filters are considered one of the most effective techniques to suppress such interference.To address the problem that existing high-voltage power supply EMI filters do not cover the conducted interference path at the output side and cannot meet the actual EMI suppression requirements at the output side during Electromagnetic Compatibility(EMC)testing of mining high-voltage frequency converters,a single-phase 10 kV high-voltage power supply EMI filter with aπ-type structure was designed based on the output characteristics of high-voltage frequency converters under Sinusoidal Pulse Width Modulation(SPWM).The influence mechanisms of motors and their high-voltage cables on the common mode and differential mode interference of the converters were analyzed,and a model of the conducted interference path of the drive system was constructed.Considering high-frequency harmonic characteristics,insertion loss,leakage current,impedance matching,dielectric withstand safety margin,and structural size constraints,aπ-type(CLC)EMI filter was selected as the filtering scheme at the high-voltage power supply output side,and the key components and parameters of the EMI filter were determined.Ceramic capacitors were used,with a capacitance to ground of 20 nF;magnetic core inductors with low-loss magnetic material—amorphous nanocrystalline alloy toroidal cores,with a filter inductance of 20μH.Power-frequency dielectric withstand,partial discharge,temperature rise,insertion loss,and conducted interference tests were carried out.The results showed that the filter effectively suppressed conducted interference in the 0.15-2 MHz frequency band,with a maximum attenuation of up to 62.3 dB,demonstrating excellent conducted interference suppression capability and thermal stability.
作者
杨庭发
邹银辉
陈钊
贺国东旭
王先全
谭垒
袁跃中
YANG Tingfa;ZOU Yinhui;CHEN Zhao;HE Guodongxu;WANG Xianquan;TAN Lei;YUAN Yuezhong(China Coal Research Institute,Beijing 100013,China;CCTEG Chongqing Research Institute,Chongqing 400037,China;Chongqing Anbiao Testing and Research Institute Co.,Ltd.,Chongqing 400037,China;College of Mechanical Engineering,Chongqing University of Technology,Chongqing 400050,China;Jiangsu REMC Electronic Technology Co.,Ltd.,Liyang 213300,China)
出处
《工矿自动化》
北大核心
2025年第9期25-32,共8页
Journal of Mine Automation
基金
重庆市自然科学基金面上项目(CSTB2024NSCQ-MSX0086)
矿用新装备新材料安全准入分析验证实验室建设项目(发改投资[2018]1371号)。
关键词
高压变频器
SPWM调制
传导干扰
共模干扰
差模干扰
EMI滤波器
插入损耗
high-voltage frequency converter
SPWM modulation
conducted interference
common-mode interference
differential-mode interference
EMI filter
insertion loss
