Research On Optimal Power Flow Of AC/DC Distribution Network Based On Multi-port Energy Router

The Multi-port Energy Router based on modern power electronic technology is a flexible device with energy transformation,transmission and routing functions of multiple ports.The device can realize the functions of power flow distribution,voltage improvement,power grid monitoring and fault isolation.Therefore,Multi-port Energy Router is regarded as the next generation of intelligent substation equipment.It is of great significance to study the optimal power flow of AC/DC distribution network with Multi-port Energy Router as the hub.Firstly,an external characteristic equivalent model based on the equivalent impedance is proposed for the Multi-port Energy Router.The functional characteristics of the Multi-port Energy Router are extracted,that is,the modular modeling of each component of the multi port quantity router is carried out,and the internal and external control strategies of the Multi-port Energy Router are fully considered to establish a general steady-state model.The simulation test proves the correctness and reliability of the steady-state model.Secondly,an AC/DC distribution network model based on the external characteristic equivalent model of Multi-port Energy Router is established.This paper analyzes the common power flow calculation methods of distribution network,and introduces the concept of virtual node to solve the integrity problem of power flow calculation of AC/DC distribution network model based on Multi-port Energy Router.At the same time,the Multi-port Energy Router is used to adjust and control the power and voltage of the port,so that the actual value of the connected distribution network nodes is replaced by the expected value,which simplifies the Jacobian matrix in the iteration,and then introduces the fuzzy multiplier of the improved step size optimization to avoid the divergence of the calculation results due to the influence of the line parameters and the initial value of the voltage.Finally,the influence of the intelligent optimization algorithm on the power flow calculation of the AC/DC distribution network model based on the Multi-port Energy Router is analyzed.At the same time,combined with the characteristics of the adjustablepower of the Multi-port Energy Router,the improved quantum particle swarm optimization algorithm is proposed to optimize the power flow results of the AC/ DC distribution network model based on the Multi-port Energy Router,and the optimal power flow is obtained.Through the improved ieee33 node calculation example,the paper compares the power flow results of different structures of AC and DC distribution network model based on Multi-port Energy Router,and verifies the feasibility and simplicity of using intelligent algorithm to calculate the power flow of AC and DC distribution network model based on Multi-port Energy Router.