考虑一致性二阶项的含多VSG微电网功频振荡抑制策略OA

Distributed generation(DG)in microgrid is generally connected through power electronic converter interface,which reduces the inertia of microgrid.The virtual synchronous generator(VSG)can provide inertia support for the microgrid.However,due to the incon-sistent response speed to load changes,power frequency oscillation will occur between multiple DGs using VSG,and even cause the insta-bility of the microgrid.To solve the above problems,a power frequency oscillation suppression strategy for microgrid with multiple VSGs is proposed considering the consistent second-order term.Firstly,the secondary control strategy of microgrid with multiple VSGs based on first-order consistency is established,and the mechanism of power oscillation between multiple VSGs is studied by using small signal anal-ysis method.Then,the second-order term of consistency is introduced to provide damping for power frequency oscillation,and the adaptive gradient algorithm is used to optimize the second-order control coefficient to improve the suppression effect.Finally,the feasibility of the strategy is verified by a simulation example.