Research On Power System Transient Stability Control Strategy Based On Multi-source Energy Storage Optimization

Large power networks and multiple units are the development trendency of modern power grids.The operation environment of the power system is becoming increasingly complex as the interconnectedness of power grids continues to expand.However,due to the power grid’s tight coupling,the power system still has the risk of voltage,power angle,and frequency instability in the face of large disruptions,as well as the possibility of grid disconnection or collapse in extreme circumstances.China’s power grid has set up three lines of defense to avoid large-scale power outages and even system collapse in order to ensure the stable and safe operation of the grid.Among them,emergency control for transient instability is a vital aspect of the three lines of defense,and it is crucial to the development of a power outage defense system.The problems of disturbed trajectory prediction,transient stability discrimination,and emergency control measures in unstable situations are addressed in this paper,which are all closely related to the safe and stable operation of the power system in emergency situations,taking into account the flexible operation mode of multi-source energy storage systems,multisource coupling,and other issues.The emergency control method of power system transient stability under the multi-source energy storage access scenario is investigated based on the features of the power system.The following are the contents of the research:（1）Construct a multi-source energy storage system including three energy storage methods:electricity storage,heat storage,and hydrogen storage.The energy characteristics and mathematical models of the three energy storage methods are respectively studied,and their respective energy models and models are constructed.circuit model.On this basis,an energy management and power distribution model of a multi-source energy storage system is proposed and constructed,considering factors such as dynamic response time,power limitation,capacity limitation,charge/heat/hydrogen charge state,cost,etc.,to realize the energy allocation and reasonable operation of multi-source energy storage system.（2）Based on the power angle prediction data,create the power system disrupted power angle prediction model and the transient stability discrimination model.To increase the accuracy of power angle trajectory prediction,a least square method based on support vector machine is proposed to estimate the parameters of the classic gray Verhulst prediction model.On this foundation,a power system transient stability discriminating approach based on phase space reconstruction is proposed,with the stability criterion being the standard deviation of the subsequence.（3）A multi-source energy storage-based emergency control technique for power system transient stability is provided.Construct a complementary cluster center of inertia relative motion（CCCOI-RM）transformation model with virtual inertia for multi-source energy storage systems,and investigate emergency control strategies for multi-source energy storage-based power system transient stability using the transient energy method.A model is built in MATLAB/Simulink to verify the feasibility of the proposed stategy.