Research On Online Check Of Power System Stability Control Strategy Table Based On DSA

With the increasing complexity of supply and demand in smart grid,the problems left over from the formulation of strategy tables and unreasonable strategies caused by the real-time changes in the grid gradually emerge,and the formulation of security and stability control strategy tables becomes more and more complex.How to make security and control strategy more reasonable,accurate and adaptable has also become more and more serious,and the verification of the power system security control strategy needs to be solved urgently.This paper proposes a solution for online verification of security and stability control strategy based on DSA system.Firstly,it is pointed out that in the execution process of the traditional strategy table,there exists the problem that the strategy does not match the actual controllable objects and constraints.Based on this,an online verification scheme of security control strategy based on constraints and controllable objects is proposed.Considering whether the existing strategies have optimization space and bad strategies,this paper improves the above schemes,and proposes an online security control strategy verification scheme based on DSA,which includes strategy optimization scheme and expert system processing scheme for bad strategies.This paper also studies several problems in the process of online verification of security control strategy.It includes the identification and strategy matching of power grid operation mode,screening and sequencing of anticipated faults,optimization scheme of security control strategy and discussion of unified compilation of strategy table.For the identification and strategy matching of power grid operation modes,two schemes of mean sensitivity and single strategy sensitivity under each operation mode are put forward.Through a slight improvement on the comparison scheme,i.e.adding weight factor,the result is more objective.In addition,an error-proof measure is given to prevent the system from changing its operation mode in the process of calculation,and the concept of discriminant domain is introduced.Aiming at the sequencing of anticipated faults,this paper compares the three methods of "risk-based sequencing","sensitivity-based sequencing" and "line weakness-based sequencing".Combining with the reality of strategy checking,the probability of fault occurrence is added to the three methods to make the results more objective and reasonable.The optimization scheme of security control strategy,this paper mainly on how to make the existing strategy more economical and effective,put forward two kinds of optimal cutting scheme,one is successive trial method and the other is dichotomy method.By comparing with the actual situation,the dichotomy method is also improved to avoid misunderstanding and misunderstanding.The expert system for dealing with bad strategies is also briefly studied in this paper.The rule table,exception description table,strategy and influence table of the knowledge base are established,which can preliminarily realize dealing with abnormal strategies.It is also necessary to discuss the unified compilation of policy tables.It is necessary to take into account the formulation of policy composition,structure storage,strategy search and its implementation procedures in order to realize the online real-time updating,portability,extensibility and compatibility of policies.