{'fraction_non_alphanumeric': 0.027635619242579325, 'fraction_numerical': 0.0, 'mean_word_length': 4.6531791907514455, '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}}
Control and simulation of grid-connected micro-grid

Grid-connected control method and simulations of the micro-grid are presented in the paper. The typical configuration of the micro-grid is presented. In order to ameliorate the effect of power quality during the grid- connected process, the power flow in the micro-grid is analyzed based on the characteristic of frequency and active power, and the time when the difference value of the voltage between the main grid and the micro-grid become zero is chosen as the best chance to connect. In the grid-connected mode, P/Q control is adopted. By the simulation tool Matlab/Simulink, different grid-connected processes are simulated and compared. The frequency and active power fluctuations are analyzed. The results indicate that the control method is effective in dominating the micro-grid during the grid-connected mode, and the choice of the best chance to connect has a great effect on the power quality in the micro-grid.