The formation and regulation of magnetism dependent on introduced defects in the Janus MoSSe monolayer has attracted much attention because of its potential application in spintronics. Here, we present a theoretical study of defect formation in the MoSSe monolayer and its introduced magnetism under external strain. The tensile deformation induced by external strain not only leads to decreases in defect formation energy, but also enhances magnetic characteristics. However, as compressed deformation increases, the magnetism in the structure induced by Se or S defects remains unchanged because this microstructural deformation adequately spin polarizes unpaired electrons of neighboring Mo atoms. Our results suggest the use of point defect and strain engineering in the Janus MoSSe monolayer for spintronics applications.

Recently, the Janus monolayer with structural symmetry-breaking has been synthesized, which displays many special physical and chemical properties. However, the regulation about its electronic structure as an important application in hydrogen evolution reaction (HER) has not been explored so far. Herein, the H and T phased MoSSe monolayer is considered as model to discuss the contribution of structural deformation to electronic structure and Gibbs free energies, searching for a potential application in HER. The calculations disclose that tensile strain not only efficiently reduces the band gap of MoSSe but also makes the Gibbs free energy of adsorbed hydrogen close to zero. Our calculations provide a new insight into regulating material’s electronic structure and HER performance.

In order to realize multi energy complementary power generation, micro-grid needs to integrate islanding operation mode and grid-connected operation mode together. In the grid-connected mode, all distributed generation(DG) units run the constant-power(PQ) control, the voltage and frequency are provided by the utility grid. In the islanding mode, the main DG unit runs the constant-voltage/frequency(v/f) control, which is equivalent to the voltage source providing reference voltage and frequency to the stable operation of the micro-grid. Smooth switching between islanding operation mode and grid-connected operation mode is the key to ensure stable operation of micro-grid. In order to solve the problem of transient electrical quantity mutation in the process of dual mode switching in microgrid, a dual-mode combined seamless switching control strategy based on current tracking is proposed for the battery inverter of the main control unit in this paper, to make the reference current of the input current inner loop controller can follow the current state at the moment before the switching moment, and maintain the correct initial value, so that the microgrid can switch smoothly and stably between grid-connected state and islanding state. In addition, simulation results are provided to verify the effectiveness of proposed control strategy, by Power Systems Computer Aided Design/Electro Magnetic Transient in DC System(PSCAD/EMTDC) simulation software. The research results of this paper have a good guiding significance for the design of multiple complementary power generation system of hydropower, wind energy and photovoltaic(PV).