Researsh On Allocation And Regulation Technology Of Generalized Interline Power Flow Controler

In order to enhance the support for new energy and the regulation with flexibility of receiving-end grid with intensive load under the background of "achieve carbon peaking and carbon neutrality",a series of transmission problems such as scarce transmission corridors and maldistribution of power flow,which cause the shortage of transfer capability,need to be solved by effective means.Flexible alternating current transmission systems(FACTS)is greatly capable of power flow control.However,due to the limitation of topology,typical FACTS devices such as unified power flow controller(UPFC)and interline power flow controller(IPFC)have their respective defects.With the combination of the technical advantages belonging to UPFC and IPFC,generalized interline power flow controller(GIPFC)can achieve multi-topology and multi-functional control of the power system.In this paper,the research on the steady-state modeling,the planning and allocation,and the regulation of GIPFC is carried out as follows.In this paper,a power flow calculation model considering the combined control modes of GIPFC and a novel five-terminal power injection model of GPFC based on power injection variables are proposed.Firstly,the steady-state model of GIPFC is constructed with the power injection method and the introduced concept of additional virtual bus.Then,the iterative formulas for the injected voltage in various control modes are derived,and the power flow calculation model considering the combined control modes of GIPFC is proposed.The accuracy and effectiveness of which are verified in Matlab.Finally,the GPFC model is reconfigured to eliminate the voltage source variables based on power injection variables,which is appropriate for the operation optimization research.In this paper,a multi-objective GIPFC allocation optimization model to improve the static voltage stability considering the wind-load uncertainties and its solution framework are proposed.Firstly,to strike the balance of the safety and economy,the multi-objective GIPFC allocation optimization model is constructed with the objectives of static voltage stability,available transmission capacity and GIPFC investment cost.Then,the solution framework for the proposed model is designed,in which the reduction of wind-load scenarios is realized by K-means clustering algorithm,the Pareto solution is solved by the multiobjective particle swarm optimizer(MOPSO)algorithm,and the compromise solution is obtained by the the multi-attribute decision considering the combination of the fuzzy entropy weight method and the fuzzy affiliation.Finally,the effectiveness of proposed model and its solution framework is verified in simulation example.In this paper,a security-constrained economic dispatch(SCED)model considering the actual control characteristic of GIPFC and its solution methodology are proposed.Firstly,the mathematical equations of GIPFC switching to UPFC after N-1 contingency are derived,and the constraints of the actual GIPFC control characteristics after N-1 contingency are constructed,especially for the GIPFC-controlled line contingency.Then,the further convex processing is realized by the mathematical deformation,approximation and binary expansion,which transforms the SCED model incorporating GIPFC,a highly non-convex optimization problem,into mixed integer second-order cone programming(MISOCP)which is easier to solve.Finally,the accuracy and effectiveness of proposed model and methodology are verified by Matlab/Gurobi in simulation example.