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As a new type of microgrid structure, AC-DC hybrid microgrid can efficientlyconsume new energy distributed generator based on photovoltaics, which is verysuitable for microgrid systems with electric vehicles as the main load. Unlikethe AC microgrid, the DC bus of the AC-DC hybrid microgrid is a low-inertiasystem. How to improve the DC bus inertia of the AC-DC hybrid microgrid systemand the stability of the DC bus voltage become particularly important. Based onthis, this paper presents a method for flexible control strategy of microgridbus voltage based on multi-node droop. By considering the P / U droopcharacteristics of DC ports of power electronic equipment such as energystorage and electric vehicle charging-discharging equipment, different types ofdistributed generator are comprehensively considered. The power reserve rateand energy reserve rate, through curve shift and other adjustment methods,improve the DC bus inertia, which effectively guarantees the stability of themicrogrid system voltage. The validity of the proposed method is verified bybuilding a matlab / simulik simulation system.

Flexible Control Strategy of DC Bus for AC-DC Hybrid Microgrid with Electric Vehicle