Research On Safety Check Of Large Power Grid Based On Future Flow

In recent years,with the rapid development of the power system,China has basically realized the interconnection of large-scale power grids,which has also put forward higher requirements for the safety and stability during the operation of the power system.At the same time,dispatchers are required to have stronger capabilities and be able to use a more powerful dispatching system to navigate a large power grid.As the core link of the power grid dispatching system,the safety check module plays an indispensable key role in the entire dispatching process.In order to cope with the daily operation of the interconnected large power grid,it is urgent to improve the original operation mechanism and traditional technical methods of the dispatching system.Therefore,this paper constructs a security check and optimization model for future trends and designs corresponding parallel solutions.Firstly,This article is based on the theory of future trends,this paper discusses the future state power flow safety check evaluation index system based on single and comprehensive characteristic indicators,and gives a mathematical description of the security check model.For the solution of future state power flow,this paper focuses on the algorithm and mathematical model of future state power flow,and studies the parallel and general solution of security check model.Secondly,according to the key requirements and difficulties of safety verification,based on Analytic Hierarchy Process theory(AHP),a fusion modeling scheme for deterministic future state security check is proposed,and a security check and optimization model with the aim of achieving the highest score in the comprehensive startup scheme is constructed.At the same time,considering the characteristics of the model built in this paper,considering the "three public" scheduling principle and the parallel solution theory,a deterministic future power flow security check and optimization model parallel solution based on the single-layer analytic hierarchy process was designed.Thirdly,in view of the uncertainty of the load,this paper draws on the research results of the deterministic transformation of the random output of wind power,and proposes an equivalent deterministic modeling scheme for uncertain loads based on the principle of probability distribution of vertical time.Using the results of this scheme,the uncertain load is divided into four typical load scenarios,and then each load scenario is integrated into the evaluation layer of the multi-layer Analytic Hierarchy Process theory model,and the multidimensional expansion of the evaluation model system is realized.Based on this,a safety check optimization model that takes into account the uncertainty of power flow is constructed,and a corresponding two-layer parallel computing method is proposed.Finally,the improved IEEE30 node numerical example is used to simulate the scheduling of the model constructed in this paper.Simulation results show that the model and solution proposed in this paper are obviously feasible.Compared with the deterministic future state security check and optimization model,the overall score of the security check and optimization model that takes into account the uncertainty of the future trend is slightly higher.Scheduling plan security check provides a new idea.