Research On Power System Forced Oscillation Suppression Method Based On Kuramoto-like Model

With the development of wide-area time measurement technology and power system real-time monitoring methods,more and more forced oscillations are detected,threatening the stable operation of the power grid.Different from "negative damping" induced oscillations,forced oscillations are system resonances caused by periodic disturbances.When the disturbance frequency is close to the natural frequency of the power grid,these small disturbances are rapidly amplified and diffused,and the power system stabilizer cannot be used to control the system.It suppresses.At present,most of the researches on suppression methods of forced oscillations focus on the location and control of the disturbance source,but there is a lack of effe ctive suppression methods in terms of macroscopic overall.To this end,this paper stu dies the suppression methods of the forced oscillation of the power grid,establishes the Kuramoto-like model of the power grid under the forced oscillation,uses the com plex network theory,adjusts the power flow path of the power grid to change the natural frequency,and reduces the damage of the forced oscill ation to the power grid.To propose suppression methods from the overall aspect of the grid.The mechanism of forced oscillation is studied,and it is found that changing the natural frequency of the system can effectively su ppress the forced oscillation.In order to simplify the analysis of the various components of the power grid,the complex network theory is used to study the influence of the grid connection structure on the natural frequency,and a Kuramoto model of the p ower grid that can induce forced oscillations is established.The transmission line switching strategy in the optimized operation of the grid ec onomy is used to realize the change of the natural frequency,and the optimal switching strategy is obtained through the enumeration method,and the method of suppressing the forced oscillation is proposed.To analyze the suppression method from the overal l perspective of the power grid and simplify the analysis of the various components of the p ower grid,a Kuramoto model of the power grid that can induce forced oscillation is established,and the simulation results in the BPA are compared to illustrate th e effectiveness of the modeling.Through the simulation analysis of the factors that affect the oscillation amplitude,it is found that changin g the natural frequency of the system can effectively suppress the forced oscillation.For this reason,the transmission line switching strategy in the economic optimization operation of the power grid is used to realize the change of the natural frequency,and the optimal switching strategy is obtained through the enumeration method,and the method of suppressing th e forced oscillation is proposed.To make the proposed suppression method more suit able for the actual operation of the power grid,the applicable power grid range is expanded.Considering the constraints of the actual operation of the power grid,the proposed suppression method is restricted,and the constraints of full grid connection and no transmission resistance are added in the calculation process,and the switching strategy that makes the power grid unab le to operate stably is eliminated.In addition,genetic algorithms based on elite retention strategies are used to formulate transmission line switching strategies to reduce the amount of calculation required.To verify the proposed method of suppressing the forced oscillation,the power grid of a certain area in China is used for simulation calculation.According to the grid situation in the area,the possibility of forced oscillation caused by wind power in the area was analyzed,and the location of the disturbance source was determined.A Kuramoto-like model is established according to the parameters of the actual power g rid,and a genetic algorithm is used to formulate a transmission line switching strategy to achieve the suppression of forced oscillation.The comparison of the oscillations before a nd after the switching strategy in BPA shows the effectiveness of the forc ed oscillation suppression method.