A Voltage Coordination Control Strategy Based On The Reactive Power-active Network Loss Partitioned Aggregation Domain

With the shortage of traditional energy and the continuous growth of electricity demand,the energy development structure is becoming increasingly diversified.Distributed new energy generation,as a clean and renewable energy source,has become one of the main energy development directions.After the large-scale integration of new energy into the power system,it will change the flow characteristics of the traditional single power grid.In addition,the increase in load in the power grid greatly increases the uncertainty of load.The above reasons make the overvoltage problem in the power system more serious,affecting the safety,stability,and economic operation of the power grid.This article conducts corresponding research on voltage control and optimization scheduling to address the above issues:According to the modularity function theory in the zoning strategy,a voltage coordination control method based on the reactive power voltage sensitivity weight zoning and the active power loss voltage sensitivity weight zoning field of sets is proposed.This control method comprehensively considers the control ability of reactive power compensation devices on node voltage and the active power network losses generated during voltage control.The goal of not only quickly adjusting the voltage to the allowable range,but also maximizing the reduction of active network losses caused by voltage adjustment has been achieved.Firstly,a power flow calculation model was established to derive reactive power voltage sensitivity and active power network loss voltage sensitivity.We studied sensitivity based weight improvement methods and characterized the degree of node coupling under different weights.We have established a modular degree function model and improved it based on sensitivity weights,providing important theoretical support for subsequent partition control.Secondly,the basic theory of power system zoning was analyzed,and the reactive power support capacity within the zoning was studied,and an indicator of reactive power support capacity was proposed.Studied the steps of improving module degree function partitioning based on sensitivity weight,divided reactive power voltage sensitivity weight partitioning and active power network loss voltage sensitivity weight partitioning.On the basis of zoning,the concept of field of sets is proposed and field of sets is divided,which lays the foundation for voltage control.The proposed field of sets partition strategy is applied to an improved IEEE39 node example to verify the feasibility of the partition method.Finally,the necessity of voltage adjustment in the field of sets is analyzed.According to the critical degree of control nodes in the field of sets,the coordinated control strategy of reactive active power loss and the selection strategy of control nodes in the field of sets are proposed.And it is applied to the improved IEEE39 node example of field of sets partition to verify the effectiveness of the control method.