一种矿用变频器传导干扰测试用高压电源电磁干扰滤波器

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中图分类号：TD61 文献标志码：A

Abstract： Conducted interference is widely regarded as the main source of current noise in Electromagnetic Interference（EMI） testingofhigh-voltagefrequencyconverters，whileEMIfiltersareconsideredoneof the most effective techniques to suppress such interference.To addressthe 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 theoutput side during Electromagnetic Compatibility （EMC） testing of mining highvoltage frequency converters， a single-phase 10kV high-voltage power supply EMI filter with a π -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 interferenceof 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， a π -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 20nF ；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，temperaturerise，insertionlos，andconducted interference tests were carredout.The results showed that the filter effectively suppressed conducted interference in the 0.15-2MHz frequency band， with a maximum attenuation of up to 62.3dB ，demonstrating excellent conducted interference suppression capability and thermal stability.

Key words： high-voltage frequency converter; SPWM modulation; conducted interference; common-mode interference; differential-mode interference; EMI filter; insertion loss

0引言

随着煤矿电网容量不断提升，矿用高压变频器向高电压、大容量（高功率）方向发展，目前单机最大额定电压已达到交流 10kV 。（剩余13372字）