基于梯形积分的储能型模块化多电平变流器等值建模OA

Energy storage systems have a huge market prospect in the new power system,which can greatly improve the power quality and stability of the grid,and the reliability of the power supply.In recent years,energy storage converters,integral to energy storage systems,have undergone rapid development.Among these,the modular multilevel converter with energy storage systems(MMC-ESS)has emerged as a prominent choice for energy storage power stations.MMC-ESS contain a large number of switching elements,which puts a great burden on electromagnetic simulation,and the utilization of MMC-ESS increases the number of electrical nodes,so how to equate MMC-ESS to improve the system computation speed is an urgent problem that needs to be solved nowadays.Addressing this pressing issue,this study proposes an innovative MMC-ESS submodule equivalence scheme based on trapezoidal integration and Thevenin equivalence methods.This article proceeds by initially outlining the topology of MMC-ESS.Secondly,considering that the energy storage system is connected to the sub-module through the DC/DC converter,MMC-ESS equivalent method is given in detail.Finally,the MMC-ESS equivalent model is built on the PSCAD/EMTDC platform to verify its feasibility and accuracy.Compared with the existing methods,the proposed scheme retains the simulation speed and accuracy while considering the practical application of MMC-ESS.