摘要
L/C恒导纳开关模型具备导纳矩阵恒定、实时仿真效率高的优势,是电磁暂态仿真中主要的开关模型之一,但虚拟功率损耗问题严重影响仿真精度。为消除虚拟功率损耗,提出一种基于零极点匹配技术的L/C恒导纳开关模型。首先,根据Z变换下极点分布规律比较结构稳定性,选择最优开关结构。其次,以零极点匹配技术离散开关模型,同时根据稳态特性与暂态特性确定模型参数。最后,通过分析虚拟损耗产生机理,提出一种恒定初始化技术,计算不同开关状态下的历史电流源。以两电平电压源型换流器为实验对象,搭建实时仿真硬件平台验证所提模型的可行性。仿真结果表明,与传统L/C恒导纳模型相比,所提开关模型的虚拟功率损耗减小92%,模型振荡时间减少20%~30%,恒定初始化技术可彻底消除虚拟功率损耗。
An L/C constant admittance switch model has the advantages of a constant admittance matrix and high real-time simulation efficiency.This is one of the main switch models in electromagnetic transient simulation.However,virtual power loss significantly affects the simulation accuracy.To eliminate the virtual power loss,a L/C constant admittance switch model based on pole-zero matching technique is proposed.First,the switch structure is selected according to the Z-transform pole distribution law on the basis of stability.Then,the switch model is discretized with a pole-zero matching technique,while the model parameters are determined based on the steady-state and transient characteristics.Finally,by analyzing the mechanism of virtual power loss,a constant initialization technique is proposed to calculate the historical current sources in different switching states.Taking a two-level voltage source converter as the experimental object,a real-time simulation hardware platform is built to verify the feasibility of the proposed model.Simulation results show that,compared with the traditional L/C constant admittance switch model,the virtual power loss of the proposed switch model is reduced by 92%,the oscillation time of the model is reduced by 20%~30%,and the constant initialization technique can completely eliminate the virtual power loss.
作者
杜金鹏
王康
汪光森
刘著
DU Jinpeng;WANG Kang;WANG Guangsen;LIU Zhu(National Key Laboratory of Electromagnetic Energy,Naval University of Engineering,Wuhan 430033,China)
出处
《电力系统保护与控制》
北大核心
2025年第5期93-103,共11页
Power System Protection and Control
基金
国家自然科学基金面上项目资助(51477179)。
关键词
电力电子开关
恒导纳模型
虚拟功率损耗
零极点匹配技术
恒定初始化
power electronic switch
constant admittance model
virtual power loss
pole-zero matching technique
constant initialization
作者简介
杜金鹏(1995-),男,博士研究生,研究方向为数值积分、电力电子系统建模与仿真,E-mail:jpdu_1409@163.com;通信作者:王康(1991-),男,博士,助理研究员,研究方向为电力电子系统实时仿真,E-mail:25729819@qq.com;汪光森(1969-),男,博士,教授,博士生导师,研究方向为大功率电能变换装置、电机控制、复杂机电系统实时仿真。E-mail:21001402@nue.edu.cn。
