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中文摘要：
构建基于钒流电池储能的虚拟同步发电机（VSG），使微电网具有同步发电机惯量大、输出阻抗大等特性。采用同步发电机5阶方程作为VSG本体模型，双向Buck-Boost变换器作为连接钒流电池储能装置与VSG的桥梁，在调频单元中加入2次调频及对转动惯量和阻尼值的合理设置，可以省去传统的预同步单元，在4象限内准确地跟踪有功和无功功率，实现VSG离网到并网平滑切换。
英文摘要：
Virtual synchronous generator(VSG)based on vanadium redox flow battery energy storage isconstructed and it has the characteristics of large inertia and high impedance. Using five-order equation ofsynchronous generator as the ontology model of VSG and Buck-Boost converter as the connection bridge betweenVRB and VSG. Through improving the frequency unit and choosing reasonable moment of inertia and dampingcoefficient,it omits traditional pre-synchronization unit and can switch smoothly from island mode to grid-connectedmode,then it accurately tracks the active power and reactive power under the four quadrants and realizes thebi-directional flow of power.
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