电工技术学报  2018, Vol. 33 Issue (16): 3686-3696    DOI: 10.19595/j.cnki.1000-6753.tces.171426
模块化多电平换流技术及其应用专题 |
基于RTDS的模块化多电平换流器闭锁状态仿真建模方法
王洁聪1, 刘崇茹1, 徐东旭1, 谢国超1, 朱毅2
1. 新能源电力系统国家重点实验室(华北电力大学) 北京 102206;
2. 国网山东省电力公司经济技术研究院 济南 250021
Simulation Method of Modular Multilevel Converter Blocking State Based on RTDS
Wang Jiecong1, Liu Chongru1, Xu Dongxu1, Xie Guochao1, Zhu Yi2
1. State Key Lab for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China;
2. State Grid Shandong Economics Research Institute Jinan 250021 China
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摘要 模块化多电平换流器(MMC)因其模块化的结构特点在高压直流(HVDC)输电领域得到广泛应用。对于MMC闭锁状态的仿真涉及对二极管这种自然开断器件的仿真。由于实时数字仿真(RTDS)平台不能使用插值和变步长算法,在RTDS中仿真时会存在数值振荡和二极管开关动作延迟的问题,RTDS是通过小步长来实现误差降低。但CBuilder工具不具备小步长仿真能力,需采用接口变压器连接,其漏抗等参数会降低仿真精度。提出一种适于RTDS平台的MMC闭锁状态仿真方法,将桥臂电抗的积分方法改为能有效抑制数值振荡的后退欧拉法,同时采用双值电阻并联RC阻尼电路的模型对二极管进行等效。通过对模型的稳态误差、暂态误差以及二极管动作延迟造成的误差进行计算分析,提出模型的参数选择方法,提高了模型的计算精度和数值稳定性。
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王洁聪
刘崇茹
徐东旭
谢国超
朱毅
关键词 模块化多电平换流器实时数字仿真数值振荡后退欧拉法二极管等效电路    
Abstract:Modular multilevel converter (MMC) has been widely used in the area of high-voltage direct current (HVDC) transmission due to its modular structure. The simulation of the MMC blocking state involves the simulation of the diode, which is a kind of uncontrolled power electronic device. However, without interpolation algorithm and flexible time-step in real-time digital simulation (RTDS), there are the problems of the numerical oscillations and the diode switching delay. Therefore, RTDS reduces the error through using small time-step solving power electronic circuit. However, the user-defined model in CBuilder does not provide small time-step simulation environment. An alternating way is to use the interface transformer connecting the small time-step model of diode, but the leakage reactance and other parameters of which will reduce the simulation accuracy. An MMC blocking model suitable for RTDS is proposed, in which the backward Euler method is adopted for arm reactor calculation to eliminate the numerical oscillation, and the diode is equivalent to a two-value resistor paralleled with an RC snubber circuit. The errors of the proposed model under steady-state and transient state as well as the error caused by the diode switching delay are analyzed and calculated. Furthermore, the method of the parameter setting to the proposed model is provided, which can improve the calculation precision and numerical stability.
Key wordsModular multilevel converter (MMC)    real-time digital simulation (RTDS)    numerical oscillation    backward-euler method    diode equivalent circuit   
收稿日期: 2017-10-11      出版日期: 2018-09-03
PACS: TM743  
基金资助:国家电网公司科学技术项目(张北柔性直流电网系统构建方案研究)(SGSDJY00JHJS1600141)资助
通讯作者: 刘崇茹 女,1977年生,博士,教授,从事交直流混合系统分析与仿真、运行与控制的科研和教学工作。E-mail: chongru.liu@ncepu.edu.cn   
作者简介: 王洁聪 女,1992年生,博士研究生,研究方向为柔性直流输电。E-mail: wangjiecong@ncepu.edu.cn
引用本文:   
王洁聪, 刘崇茹, 徐东旭, 谢国超, 朱毅. 基于RTDS的模块化多电平换流器闭锁状态仿真建模方法[J]. 电工技术学报, 2018, 33(16): 3686-3696. Wang Jiecong, Liu Chongru, Xu Dongxu, Xie Guochao, Zhu Yi. Simulation Method of Modular Multilevel Converter Blocking State Based on RTDS. Transactions of China Electrotechnical Society, 2018, 33(16): 3686-3696.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.171426          https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I16/3686