半隐式延迟解耦的开关动作高效处理方法  

Efficient Processing Method of Switching Actions with Semi-Implicit Delay Decoupling

作　　者：吴小珊 赵利刚 苏寅生[2] 姚海成[2] 范昕冉 WU Xiaoshan;ZHAO Ligang;SU Yinsheng;YAO Haicheng;FAN Xinran(State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China;Power Dispatching and Control Center,CSG,Guangzhou 510663,China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]直流输电技术全国重点实验室(南方电网科学研究院),广州510663 [2]中国南方电网电力调度控制中心,广州510663 [3]华北电力大学电气与电子工程学院,北京102206

出　　处：《南方电网技术》2024年第7期46-54,共9页Southern Power System Technology

基　　金：国家重点研发计划资助项目(2021YFB2400500);中国南方电网有限责任公司科技项目(ZBKJXM20232431)。

摘　　要：传统电磁暂态仿真采用详细模型建模电压源型换流器(voltage source converter,VSC)并采用双插值法(double interpolation method,DIM)处理步长内的开关事件,由于详细模型的导纳阵时变,DIM算法流程复杂,在进行大电网仿真时严重影响计算效率。针对这一问题,应用半隐式延时解耦原理建模VSC,并对步长内开关事件的处理方法进行研究,通过对开关函数在步长内的占空比进行等值代替DIM,提高仿真效率。首先,从VSC状态方程出发,得到VSC解耦模型,实现换流器的并行计算,提高计算效率;其次,分析了不处理开关事件时累计误差的产生机理,并给出了计算时序和开关函数等值占空比的计算方法,保证仿真精度;最后,以PSCAD的仿真波形为基准,验证了所提方法的精度和有效性,讨论了所提方法的方法特点。Traditional electromagnetic transient simulations use a detailed model to model the voltage source converter(VSC)and use the double interpolation method(DIM)to handle switching events within a step.Due to the time-varying conductor array of the detailed model and the complex DIM algorithm process,the computational efficiency is seriously affected when performing large grid simulations.To address this issue,the semi-implicit delay decoupling principle is applied to model VSC and the handling of switch⁃ing events within a step is investigated to improve the simulation efficiency by equating the duty cycle of the switching function within a step instead of DIM.Firstly,starting from the state equation of VSC,the decoupling model of VSC is obtained to realise the parallel computation of the converter and improve the computational efficiency.Secondly,the mechanism for generating the accumulated error when switching events are not processed is analyzed,and the computational time scale and the calculation of the equivalent duty cycle of the switching function is also given to ensure the simulation accuracy.Finally,the accuracy and effectiveness of the proposed method are verified by the simulation waveforms of PSCAD as a benchmark,and the methodological features of the proposed method are discussed.

关 键 词：电压源型换流器 半隐式延时解耦 电磁暂态仿真 开关动作处理 并行计算 

分 类 号：TM74[电气工程—电力系统及自动化]