{'fraction_non_alphanumeric': 0.02763819095477387, 'fraction_numerical': 0.0016750418760469012, 'mean_word_length': 5.2894736842105265, '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}}
Enhancement of Grid Connected PV Arrays Fault Ride Through and Post Fault Recovery Performance

In this paper, a novel nonlinear control system for enhancing the low-voltage ride through capability and post-fault recovery performance of two-stage grid connected PV arrays (GCPAs) is proposed. The proposed control scheme is composed of two controllers: 1) finite-time sliding mode control (FTSMC) and 2) proxy-based sliding mode control (PBSMC). The FTSMC, which assures the finite time convergence of the tracking error, controls the dc/dc converter of GCPA during voltage sags to assure the dc-link capacitor voltage does not exceed its limits. PBSMC controls the dc/ac inverter. PBSMC provides accurate and fast tracking feature during normal condition (similar to PID controller) and is capable of very smooth resuming to the desired reference value/trajectory after large disturbances that may lead the control signal to exceed the limits. Therefore, during post-fault voltage recovery period, PBSMC exits saturation faster and smoother which significantly enhances the recovery performance of GCPA. The advantages of the proposed control schemes are demonstrated using simulation results.