摘要
当前电力系统中的电力电子装置越来越多,电力系统的电力电子化趋势日益增强。针对电力电子开关二值电阻模型导纳矩阵时变以及传统L/C模型暂态过程精度低、虚拟功率损耗大的问题,提出了一种基于指数积分的电力电子开关恒导纳模型。该模型综合二值电阻模型和传统L/C恒导纳模型的特点,考虑了开关实际工作过程中存在的稳态损耗及切换时的暂态过程,并能够保证导纳矩阵不变从而提高仿真效率。即通过在传统L/C恒导纳模型导通和关断等效支路中分别引入电阻R_(on)、R_(off),形成具有阻尼作用的一阶动态电路形式。通过终值定理证明所提模型稳态情况下与二值电阻模型一致,然后通过谱半径分析确定模型的L/C参数,使所提模型开关切换时的暂态过程相比于传统L/C模型更短,从而虚拟功率损耗也更低,并从数学上分析了采用指数积分法的精度高于基于时域逼近的仿真方法。最后,通过算例验证了该模型的有效性与可行性。
At present,there are more and more power electronic devices in the power system,and the power electronic trend of the power system is increasing.Aiming at the time-varying admittance matrix of binary resistance model of power electronic switch and the low accuracy and high power loss of traditional L/C model in transient process,a constant admittance model of power electronic switch based on exponential integration is proposed in this paper.This model combines the characteristics of binary resistance model and traditional L/C constant admittance model,takes into account the power loss and transient process in the actual working process of the switch,and ensures that the admittance matrix remains unchanged,so as to improve the simulation efficiency.In other words,resistance R_(on)and R_(off)are introduced into the on and off equivalent branches of the traditional L/C constant admittance model to form a first-order dynamic circuit with damping effect.It is proved by the terminal value theorem that the proposed model is consistent with the binary resistance model in steady state.Then,the L/C parameters of the proposed model are determined by spectral radius analysis,so that the convergence process of the proposed model is shorter and the power loss is lower than that of the traditional L/C model.Finally,the effectiveness and feasibility of the model are verified by an example.
作者
许明旺
姚逸凡
宋文达
姚蜀军
韩民晓
XU Mingwang;YAO Yifan;SONG Wenda;YAO Shujun;HAN Minxiao(School of Electrical and Electronic Engineering,North China Electric Power University,Changping District,Beijing 102206,China;Sichuan Branch,China Three Gorges Corporation,Chengdu 610041,Sichuan Province,China)
出处
《电网技术》
EI
CSCD
北大核心
2022年第4期1519-1528,共10页
Power System Technology
基金
国家自然科学基金项目(52077077)
国家重点研发计划项目(2021YFB2400500)。
关键词
电磁暂态仿真
恒导纳建模
指数积分
虚拟功率损耗
electromagnetic transient simulation
constant admittance modeling
exponential integrators
virtual power loss
