Abstract
The present work is aimed at improving the performance of the multiobjective energy parallel step-by-step power generation system and enhancing the reliability and stability of the energy supply. Firstly, the difficulties of the ring current control method of the inverter power supply are summarized. Secondly, the causes of ring current in the circuit are analyzed. On this basis, the topology structure of the primary circuit of the inverter unit is designed, and the simulation model of the droop control is proposed for the inverter power supply. Finally, experiments are implemented to test the performance of the model. The results demonstrate that the waveform quality of the output voltage of the parallel system controlled by the virtual impedance technology is significantly improved. Specifically, the harmonic content near the fundamental wave significantly decreases compared with the original, from 6% to about 2%. Besides, the interference of the ring current to the parallel control inverter of the power supply system is weakened, and the output stability of the inverter power supply is improved. This study designs the structure of the inverter converter based on multiobjective decision-making and discusses the droop parallel control strategy. It provides a specific reference for controlling the circuit parallel system and has positive promotion significance for sustainable energy management and the rational utilization of electric energy.
Highlights
As the basis for the survival and development of human society, energy has always been the focus of research in related fields in various countries
The results show that the droop theory can be applied to parallel inverter systems and achieve a good control effect under ideal conditions
The rational utilization and sustainable development of energy are the hotspots of current research
Summary
As the basis for the survival and development of human society, energy has always been the focus of research in related fields in various countries. Distributed power generation has the advantages of saving energy, environmental protection, high efficiency, and flexibility, becoming the focus of relevant research fields worldwide. The distributed generation system with multiple power sources in parallel plays a vital role in promoting the development and utilization of renewable energy, expanding the capacity. The inverter power supply is the heart of the distributed generation system [11, 12] It converts distributed energy sources into electricity through inversion, current sharing, and other techniques that enable the system to operate parallel with the grid. Removing the interconnection between inverters in a parallel system can eliminate the above defects and improve the system’s reliability This operation will cut off the information exchange between parallel modules, dramatically increasing the difficulty of control. In addition to the digital simulation of the parallel control strategy of the inverter power supply, an experiment is designed to test its performance, hoping to achieve satisfying research results
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