Research On The Open-loop Of Regional Electromagnetic Loop Network

HV and LV electromagnetic loop network is an inevitable product in the process of power grid development.In the early stage of high-voltage power grid development,its existence has important positive significance to promote the development of power grid.However,with the development of the power grid,its disadvantages are increasingly prominent,hindering the development of power grid,such as system stability damaged by power flow shift during high voltage line failure,the difficulty to control short circuit current,etc.According to the development situation and operation needs of the power grid,opening the electromagnetic loop network in a timely manner in some areas or at an appropriate stage of development can eliminate hidden dangers to the security of the power grid and enhance the stability of the power grid's operation.Based on the actual power grid development plan,this paper conducts a research on the decoupling of an electromagnetic loop network in a certain area.Through electrical calculation and analysis,the scheme for decoupling the electromagnetic loop network and realizing power grid division is formulated.Through the comprehensive evaluation of the alternative schemes,the best scheme is determined for the reference of planners and operators to guide the regional power grid construction.Firstly,this paper summarizes the research status of electromagnetic loop network decoupling,analyzes the advantages and disadvantages of electromagnetic loop network decoupling by combining the development process of electromagnetic loop network,introduces the principles and general steps of electromagnetic loop network decoupling.Then,taking the actual power grid as a case,combined with the development plan of the power grid in the next few years,this paper studies the open-loop of the electromagnetic loop network in a certain region in which the load,power supply and network change in the next few years.Firstly,according to the current situation of the power grid and the trend of historical load change,this paper forecasts the load,builds the power grid simulation model by using PSD software,and then analyzes theproblems of the power grid before the electromagnetic loop network was decoupled.For the inter-regional electromagnetic loop network,this paper makes an open-loop scheme,and analyzes the feasibility by electrical calculation.For the regional power grid,this paper applies the improved automotive relay model to divides the power grid,builds the division scheme and proposes a variety of open-loop schemes and verifies the feasibility from the aspects of power flow,N-1,network loss,short-circuit current and voltage level,etc.After that,according to the research content,this paper establishes an evaluation index system for electromagnetic loop network decoupling,and determines the optimal open-loop solution by using AHP to comprehensively evaluate the three decoupling schemes of the regional electromagnetic loop network.In the end,the work of the full text is summarized and the next step is prospected.The research in this paper eliminates the potential safety risks brought by the operation of the electromagnetic loop network to the actual regional power grid,and improves the economy of the power grid operation which provides an effective solution for the planning and construction of the power grid and the safe operation of the system.