基于交叉初始化的换流器参数化恒导纳模型  

A Parameterized Fixed-admittance Model of Converters Based on Cross Initialization

作　　者：曹阳 顾伟[1] 柳伟 曹戈[1] 楼冠男 邹德虎 CAO Yang;GU Wei;LIU Wei;CAO Ge;LOU Guannan;ZOU Dehu(School of Electrical Engineering,Southeast University,Nanjing 210096,Jiangsu Province,China;School of Automation,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu Province,China)

机构地区：[1]东南大学电气工程学院,江苏省南京市210096 [2]南京理工大学自动化学院,江苏省南京市210094

出　　处：《中国电机工程学报》2021年第10期3518-3527,共10页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0900404)。

摘　　要：电力系统小步长仿真中,电力电子换流器常采用基于电感电容等效的恒导纳模型,存在参数不易设置、虚拟功率损耗高、模型特性与理想模型差距大等问题。鉴于此,文中提出一种基于交叉初始化的换流器参数化恒导纳模型。在换流器两种不同运行状态下,开关采用含参数历史电流源的恒导纳模型,模型的稳态特性和暂态收敛特性由历史电流源参数决定,实现了参数设置与外电路解耦。同时通过交叉初始化方法,即状态切换时同桥臂开关相互初始化,减小了状态切换误差初值,解决了模型的虚拟功率损耗问题。仿真结果表明,本模型具有与传统恒导纳模型相同的计算效率和更高的精度,其运行特性更接近理想开关模型。In small step simulation,power electronic converters often use the L/C-based fixed-admittance model,which has shortcomings such as complicated parameter setting,high virtual power loss,and the large gap of characteristics between the model and the ideal model.In view of this situation,this paper proposed a parameterized fixed-admittance model for power electronic converters based on cross initialization.In different operating states of converters,switches adopted the fixed-admittance model with the parameterized history current source.The steady-state characteristics and transient convergence characteristics were determined by the parameters of the historical current source,and the parameter setting was decoupled from external circuits.Besides,the initial error of state switching was reduced by cross initialization,which is the mutual-initialization method of switches in the same bridge arm during state switching,and virtual power loss of the model was eliminated.The simulation results demonstrate that this model has the same efficiency and higher accuracy compared with the traditional constant admittance model.Furthermore,its operating characteristics are closer to the ideal model.

关 键 词：换流器 小步长仿真 恒导纳模型 电力电子开关 虚拟功率损耗 

分 类 号：TM46[电气工程—电器]