{'fraction_non_alphanumeric': 0.018641810918774968, 'fraction_numerical': 0.0, 'mean_word_length': 5.214876033057851, '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}}
Stability analysis for grid-connected three-phase inverter with LCL filters

A grid-connected inverter is indispensable, for example, for photovoltaic power generation and smart grid systems, and it must be designed and operated stably. This paper proposes a new simple stability analysis method based on a z-domain impedance method for three-phase inverter with a digital control. Then it also proposes a new stability analysis method which considers parameter tolerances. It is a sort of the tolerance analysis based on the Monte Carlo method. The frequency characteristics are computed numerically by a discrete transfer function with Matlab. The computed impedances and stability analysis results are verified both by simulation and by experiment.