Optimal Control Of Power Flow In Electromagnetic Loop Network Considering Short-circuit Current Suppression

In today’s society,the development speed of the power grid is getting faster and faster.As more and more large-capacity units are connected to the 220 k V power grid in the area,the phenomenon of short-circuit inrush current exceeding the limit is becoming more and more obvious.At present,common short-circuit current control methods include: grid sub-regional operation,line or bus-connect series reactance,change of switchgear,and installation of small reactance at the neutral point of high transformer.In the control process,multiple methods or a single combination are used to achieve the purpose of limiting the effect of short-circuit current.At the same time,the problems caused by the electromagnetic loop network are becoming more prominent.Under normal circumstances,the closed loop operation will bring the risk of excessive short-circuit current,and the unlooped operation will have the disadvantages of reduced power supply capacity and reliability.With the vigorous development of domestic flexible DC technology,flexible DC technology has proposed new solutions to a series of problems in the power grid.In this context,this subject has included the installation of the flexible ring network controller in the high and low voltage electromagnetic ring network after analysis,and solved the short circuit of the power grid and the steady state operation of the power system in this way.This paper first studies the reasons for the formation of the electromagnetic ring network and the traditional short-circuit current suppression methods,and then fully studies the structure and operating principle of the flexible ring network controller,and builds the flexible ring network controller model on the Matlab\Simulink platform.It has verified its ability to control the power flow of the system,and designed a short-circuit current limit mode.The NewtonRaphson method,which is commonly used in AC and DC systems,is used for power flow calculation.At the same time,the influence of the flexible ring network controller is determined based on relevant data.Exploring the trend of the ring network,the main analysis direction is the power situation,and specific research is carried out in the calculation example.When analyzing and judging the ring network controller with flexible characteristics,the genetic catastrophe algorithm is used to construct the optimal power flow model,aiming at the lowest active power loss of the system as the objective function,taking into account the equality and inequality constraints of the AC and DC system,and Optimized.Finally,in the simulation software,IEEE14 and other examples are used to connect two of the nodes with a flexible ring network controller,which verifies its control effect on system power flow and short-circuit current control.The power flow optimization control proposed in this paper using flexible DC technology can also solve or alleviate the problems caused by short-circuit current to a certain extent.This method improves the safety and stability of the system and improves the reliability of the power grid.Performance and safety,which have important guiding significance for solving problems such as electromagnetic ring network.