Open AccessResearch On VSG Comprehensive Control Strategy For Power Grid Voltage Sag
Author(s) -
Xiangyang Yu,
Zekai Lu,
Yan Ding,
Chunyang Gao,
Shiyan Liu,
Lu Dong
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/512/1/012139
Subject(s) - control theory (sociology) , voltage , maximum power point tracking , computer science , photovoltaic system , capacitor , electrical impedance , voltage drop , limit (mathematics) , ac power , power (physics) , inverter , engineering , electrical engineering , control (management) , physics , mathematics , mathematical analysis , quantum mechanics , artificial intelligence
Virtual Synchronous Generator (VSG) photovoltaic inverter still has the problems of surge current and voltage overcharge when the grid voltage drops. Aiming at the problems mentioned above, the comprehensive control strategy for AC/DC is proposed. The direct current (DC) side adopts the strategy of super-capacitor energy storing and switching Maximum Power Point Tracking (MPPT) derating, the alternating current (AC) side adopts the control strategy of virtual impedance and the vector difference of limited voltage, which are based on the quasi-proportional resonance. Particle swarm optimization (PSO) is used to optimize its parameters because of the difficulties in adjusting parameters of quasi-proportional resonance control by experience. This strategy can track on the voltage with no difference when the voltage is normal, it can also limit the overcharging voltage and the surge current into the demanded range when the voltage drops. Finally, the effectiveness of the strategy proposed in the paper is verified by simulation.