Research On Reactive Power Optimization Configuration Of 110kV Substation Considering Regulation Complexity

Reasonable substation reactive power optimization configuration can effectively improve the power system power quality and reduce system network loss on the premise of minimal reactive power compensation input.Aiming at the problems of reactive power compensation capacity and capacitor optimization grouping in the reactive power optimization configuration of substations,this paper conducts an in-depth study on the reactive power configuration method of 110 k V substations considering the regulation complexity.Firstly,Analyze the reactive power flow of the 110 k V substation,and obtain the characteristic parameters that affect the reactive power configuration of the 110 k V substation.The enumeration method is used to perform the reactive power optimization calculation under different characteristic parameter combinations,and the sensitivity analysis of each characteristic parameter is classified and classified into main characteristic parameters and secondary characteristic parameters.This paper presents a recommendation table and additional suggestions for the reactive power allocation ratio of a substation that takes both the general characteristics and the differences into consideration,guided by the main characteristic parameters.Secondly,Define the reactive overshoot rate index to coordinate the contradiction between the number of reactive configuration groups and the capacity of a single group.Establish a reactive power planning grid model and mathematical model,and use the improved genetic algorithm to calculate the optimal reactive power allocation capacity.The voltage and reactive power sensitivity analysis is performed on the compensation point,and the size of the reactive overshoot rate index is obtained.Guided by the reactive overshoot rate,the capacitors are roughly grouped into unequal volumes.Thirdly,Establish a capacitor bank regulation complexity index system,including investment cost-effectiveness ratio,adjustment gear stage number ratio,and single group maximum capacity ratio.Set the number of capacitor groups,the optimal coverage is calculated on the reactive power demand distribution curve of the substation to obtain the reactive power mismatch area.Taking the minimum reactive mismatch area,minimum equipment investment cost,and optimal control complexity as the objective functions,an unequal-capacity grouping model for substation reactive power optimization configuration is established.Lastly,The gear coefficient index is defined to coordinate the contradiction between the reactive power adjustment capacity of the capacitor bank and the complexity of the control strategy,and it is added to the investment cost.To circumvent the shortcomings of the existing typical daily reactive power curve method,a method for obtaining the probabilistic daily reactive power demand curve is proposed,and the optimal coverage is performed on it.Taking the capacity of each type of capacitors and their corresponding groups as optimization variables,a reactive power allocation model capable of determining the number of groups is established.The simulation case shows the effectiveness and practicability of the method in this paper,and it has certain guiding significance for the reactive power optimization configuration of the substation.