Taking the 3#microgrid in the demoretration project of multi-energy,complementary active distribution network of national energy adminsitration as the object of study,the technology of VSG in photovoltaic and energy storage microgrid systems was studied. The principle,topology and control scheme of the VSG were introduced. The power control method of the virtual power was designed,and the voltage outer loop characteristic of the stator electric equation was analyzed. In order to meet the needs of two aspects of VSG frequency modulation and dynamic performance,a parameter design constraint was proposed to ensure that VSG has good dynamic characteristics while satisfying frequency modulation performance requirements;aiming at the microgrid composed of 150 kW photovoltaic and 400 kW energy storage,100 kW VSG,experiments such as black start,planned off/grid switching,unplanned off/grid switching were carried out to verify the reliability of the VSG scheme adopted.

针对虚拟同步发电机(VSG)控制策略在微网应用中实现并离网无缝切换的控制策略进行研究,首先阐述了微网系统中引入VSG控制策略有利于实现微网的并离网无缝切换;其次,基于VSG控制策略,分析了微网系统在并离网切换暂态过程中存在的问题,并研究相应的控制策略,使微网系统可以实现并离网的无缝切换;最后,通过实验验证表明该控制策略具有良好的可行性,可实现并离网的无缝切换,保证负荷在切换过程中不断电.