Peak Regulating Plan Of Receiving-end Grid Located UHV Transmission Corridor

Sufficient load capacity is one of the important conditions to ensure the security and stability of power grid. From the perspective of operation, the access of large-scale UHV will change the properties of the original grid and show the end features, which largely weakens the load capacity of the system, increases the difficulty of peak load and peak pressure. In this context, selecting UHV and receiving-end grids as objects to research peaking theory and method is not only conducive to the safe and economic operation of receiving system, but also of important theoretical significance and practical value for a wide range of optimal allocation of resources.The paper defines the adjustable capacity suitable for the access of UHV and presents a real-time load forecasting model based on improved time sequence and grey, which shows that the combination forecast method is better than single model in mathematical analysis perspective. For thermal power, hydropower and pumping storage units, this paper establishes their daily peak load model and discusses the operation costs involved in peaking. For a single receiving-end grid, with the lowest operation cost for the target, it sets up a mixed-integer programming mode about multi-joint peaking power. For multi-terminal power, because UHV range distribution plan will directly affect its peak output, it explores a new scheduling ways of UHV to seek the minimum operation costs with the demand on each power peaking.This article aims at decision optimal peaking scheme under the premise of end-system’s security and stability and the different costs and constraints of various types of peak power, so that operation costs of single receiver system or total receiver system to a minimum within a given period. Respectively linearize model and select the typical day to solve the simulation based on CPLEX. Results show that the access of UHV will affect the daily load parameters, in particular increasing the system’s peak difference. For combined with peak, thermal power serves as principal of peaking power because of its proportion. Peak-valley ratio may affect the pumped storage power’s station. For multiple receiving systems, the UHV network output distribution method newly proposed breaks the existing distribution at same proportion in each period, reducing the operation costs of the system.