Research On Fast Static Security Analysis Algorithm Of Power Grid Interactive Course

With the high penetration of intermittent renewable new energy sources and rapid development of flexible load represented by electric vehicle, energy storage and demand response, there are many kinds of coupling relations and complex interactive forms between the source, the network and the load in power grid, so that the complexity of the steady operation in power grid is increasing and the basic theory and method of the grid security analysis in the interactive environment is needed to study and develop. Traditional static security analysis of single section based on deterministic power flow calculation did not consider randomness of the output of the distributed generation, the random nature of the response of the flexible load and the change of the network structure and parameters, and cannot meet the needs of the new power system. The discrete, one by one section of the static security analysis method because of the huge computational intensity and tedious steps, has been unable to meet the requirement of power system analysis in interactive process.Therefore, in the static security analysis of the interactive process of power network, the concept of probabilistic power flow and time oriented process is used to improve the efficiency and effectiveness of analysis, with important theoretical significance and engineering value.Firstly, the probability distribution model of each component in power system is studied, and with consideration of interaction between the power grid and its stochastic nature, a probabilistic power flow based on the semi invariant method Monte Carlo simulation method are proposed.Secondly, based on the probabilistic power flow with consideration of interaction, probabilistic static security analysis considering interaction is realized by probabilistic method of automatic contingency selection.Thirdly, through the time-process oriented adaptive state division method, using the time-process oriented probabilistic static security methods to rapid assess the security situatfon of the different interactive time scale, all the time course of contingency results are obtained.Finally, combined with the use of reverse equivalent match method and interior point method, a mathematical model and solution algorithm for power security correction control considering with stochastic factors of power grid is established.Through a number of examples in Ningxia and Jiangsu power grid system, the accuracy and efficiency of the proposed method are verified.