| At present,the main problem of the power transmission network is the insufficient transmission capacity.The main problem of the distribution network is that the network loss is too large.In order to solve the above two problems,this paper integrates the transmission-distribution network redundancy topology as the decision amount into the grid.A collaborative scheduling model based on DC power flow and AC power flow model is proposed to make the power flow distribution more reasonable,thereby reducing the load balance of the transmission line,and reducing the network loss in the operation of the power system,effectively improving the economic and safety of the power grid operation.Firstly,it briefly introduces the research background and significance of power system economic dispatching.The large-scale grid-connecting of new energy sources and the widespread promotion of flexible and controllable loads such as electric vehicles make power system dispatching face a new situation,and research methods at home and abroad.After a certain summary of the research results,it points out the problems that need to be solved in the field of power system economic dispatching research,and proposes to incorporate the transmission-distribution network association topology collaborative decision into the power system economic dispatch.Secondly,due to the large-scale grid connection of new energy generation with random,volatility and intermittent power such as wind power and photovoltaic,the traditional power system economic dispatch based on source-load balance is facing new challenges,and the transmission and distribution network topology has some redundancy.I have the basic conditions for topology optimization.Only by making full use of the flexible and controllable power electronic equipment in the power grid to realize the overall coordination of source-network-load,is the fundamental of the future optimal operation of the power grid,that is,the traditional source-load coordinated scheduling expansion Coordinated scheduling for source-network-load.Thirdly,the load balance of the power transmission and distribution lines directly affects the safety of the grid operation.Reducing the grid load balance is the level of indirectly improving the safe operation of the grid.Based on the topology optimization of the transmission-distribution network,a grid is constructed.The cooperative scheduling model of load balance,which is a typical quadratic convex optimization problem,needs to introduce the Lagrangian function to obtain the optimality condition.When the problem scale is large,it can be solved quickly by using the interior point method and other algorithms.Subsequently,the correctness of the model was verified by using the IEEE six-node system and a regional power grid.Finally,power system network loss is an important indicator of grid economic operation.At present,the network loss of power system is about 4%-6%.The network loss is often converted into heat energy on the grid equipment.Excessive network loss not only affects the grid equipment.Safe operation,and will degrade the operation of power system equipment,reducing network loss is a factor that must be considered in system scheduling.Based on the optimization of transmission-distribution network topology architecture,a collaborative scheduling model for reducing power system network loss is constructed and utilized.The IEEE six-node system and a regional grid verified the correctness of the model. |
