{'fraction_non_alphanumeric': 0.021839080459770115, 'fraction_numerical': 0.0, 'mean_word_length': 4.925170068027211, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A novel non-zero sequence choke and its application in output EMI filters for PWM inverters

This paper proposes a novel non-zero sequence choke and analysis of its characteristics when applied as an EMI filter to reduce the common-mode voltage in the PWM inverter. The non-zero sequence choke behaves like an inductor only in the differential-mode circuit, but it has zero impedance in the common-mode circuit. When it is used in series with the capacitors as the EMI filter, the differential-mode currents flowing through capacitors are blocked without any effect on the common-mode voltage reduction. Furthermore, since the zero sequence-choke is very small, the proposed common-mode EMI filter is smaller than the conventional filter. Experimental results on a real drive system confirm the theoretical concepts and verify the feasibility of industrial applications.