A Method For Optimal Voltage Sag Monitor Placement Considering Comprehensive Economic Loss And Multidimensional Uncertainty

In recent years,the economic impact of voltage sags has become more serious,which has led to an increasing demand for monitoring by the power supply and consumption sides.Because of its significance in balancing monitoring requirements and investment costs,the research on optimization of voltage sag monitoring has received extensive attention from scholars at home and abroad.Its classic method,the monitor reach area method,still needs further improvement in terms of economic discussion and consideration of multi-dimensional uncertain factors.This article has carried out corresponding research for this.First,this paper designs a comprehensive evaluation index system and evaluation method for voltage sag economic loss,aiming to evaluate the voltage sag loss of system nodes through the comprehensive economic loss evaluation value weight,and provide an economic priority scheme for monitoring optimization.The indicator system is constructed from three dimensions of loss type,market entity,and indicator type.Compared with the existing indicator system,it clarifies the composition of the voltage sag economic loss in detail;the evaluation method is an improved entropy TOPSIS.It is used to objectively evaluate the above-mentioned index system,which is helpful to solving information amplification on traditional entropy boundary and distinguish object differences.Then,this paper proposes a method for optimal voltage sag monitor placement considering fault uncertainty,which is used to solve the situation that the existing MRA method does not take into account the uncertain factors of the fault such as the fault type,the fault location and the ground impedance,which is easy to produce the monitoring blind zone.First,based on the Monte Carlo method,a typical fault set,an MRA matrix considering the uncertainty of the fault,and economic loss estimation weights are generated.Then,with the classic MRA matrix and the MRA matrix considering the uncertainty of the fault as constraints,the combined weight of the comprehensive economic loss evaluation value and the economic loss estimate value as the priority,this program completes the optimal configuration of voltage sag monitor placement that minimized the number of monitoring points and maximized the priority weight of monitoring.Finally,this paper proposes a method for optimal voltage sag monitor placement considering multi-dimensional uncertainty.Based on the uncertainty of the fault,this method is used to further solve the problem that the existing MRA method does not consider the multi-dimensional uncertainty factors such as operating topology,power output,and load fluctuations,which may easily cause the lack of sag information monitoring.First,the method generates a set of typical operating states that can characterize the operating uncertainty,and generates a high-dimensional MRA matrix based on the typical fault set;then,the reduced-dimensional MRA matrix and sag information column vector generated by matrix compression technology are taken into the optimization model,the optimal configuration for maximizing the acquisition of monitoring information is completed.This paper takes the IEEE39-bus and IEEE33-bus system as an example to perform simulation calculations in Matlab simulation environment to verify the effectiveness and speed of the above-mentioned voltage sag monitoring optimal configuration model and method.