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采用时频坐标变换的大规模交直流系统多模态仿真方法
作者:
作者单位:

1.电力传输与功率变换控制教育部重点实验室(上海交通大学),上海市 200240;2.国网上海市电力公司,上海市 200122

作者简介:

宋钊(1998—),男,本科生,主要研究方向:电力电子化电力系统实时仿真。E-mail: szh-98@sjtu.edu.cn
舒德兀(1991—),男,通信作者,长聘教轨助理教授,主要研究方向:电力电子化电力系统、多速率仿真。E-mail: shudewu@sjtu.edu.cn
严正(1964—),男,教授,博士生导师,主要研究方向:电力系统优化运行、电力系统稳定分析。

通讯作者:

基金项目:

国网上海市电力公司科技项目(52097018000D);上海市扬帆计划资助项目(19YF1423500)。


Multi-domain Simulation Method for Large-scale AC/DC Systems Based on Time-Frequency Coordination Transform
Author:
Affiliation:

1.Key Laboratory of Control of Power Transmission and Conversion, Ministry of Education;(Shanghai Jiao Tong University), Shanghai 200240, China;2.State Grid Shanghai Municipal Electric Power Company, Shanghai 200122, China

Fund Project:

This work is supported by Science and Technology Project of State Grid Shanghai Municipal Electric Power Company (No. 52097018000D) and Shanghai Sailing Program (No. 19YF1423500).

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    摘要:

    为了准确地仿真大规模交直流系统的动态特性和各个元件之间的相互影响,亟需一种高精度、高效率的仿真方法。为此,文中提出了基于时频坐标变换的大规模交直流系统多模态仿真方法。在该方法中,直流系统采用时频变换模型进行建模并划分到频移子系统,可以在保证精度的前提下采用更大的步长进行仿真,使仿真效率明显改善。同时还对频移子系统与电磁子系统之间的接口模型,即多模态接口传输线模型进行了优化设计。该接口模型可同时反映动态过程的瞬时值波形和相量值波形。最后,采用国内某实际含有四端柔性直流系统的大规模交直流系统作为案例进行测试,证实了所提方法的有效性。

    Abstract:

    In order to accurately simulate the dynamics of large-scale AC/DC systems and interactions between individual components, a simulation method with high precision and efficiency is highly required. A multi-domain simulation method for large-scale AC/DC systems based on time-frequency coordination transform is proposed. In this method, DC systems are partitioned into the phasor-shift sub-systems, which are presented by their phasor-shift models based on the time-frequency coordination transform. This method can adopt large time-step to improve the efficiency while the accuracy is guaranteed. Further, a multi-domain interface model between phasor-shift sub-systems and electromagnetic sub-systems,which is also called interface transmission line model, is optimally designed. The interface model can reflect both instantaneous and wide-band phasor waveforms simultaneously. Finally, an actual AC/DC system integrating four-terminal flexible DC system in China has validated the effectiveness of the proposed method.

    图1 变压器的时频变换模型Fig.1 Time-frequency transform model of transformer
    图2 考虑正常/闭锁状态下的MMCFig.2 MMC during the normal/blocking states
    图3 基于时频变换理论多模态接口传输线模型Fig.3 Multi-domain transmission line model based on time-frequency transform theory
    图4 交流故障下的母线SJ交流母线电压曲线Fig.4 AC voltage of bus SJ with AC fault
    图5 直流双极短路故障下的不同状态量在不同仿真步长下的曲线Fig.5 Curves of different state variables with different simulation time-steps during DC bipolar short-circuit fault
    图 国内含有四端柔性直流系统的交直流混联系统Fig. AC/DC system integrating four-terminal flexible DC system in China
    图 交流故障下的母线SJ交流母线电流曲线Fig. AC current of bus SJ under AC fault
    图 交流故障下不同状态量在不同仿真步长下的曲线Fig. Curves of different state variables with different time-steps under AC fault
    图 直流双极短路故障下的电容电压曲线Fig. Curves of capacitor voltages under DC pole-to-pole fault
    图 不同换流站数量下不同方法的效率比较Fig. Efficiency comparisons of different methods with different number of converter stations
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引用本文

宋钊,舒德兀,严正,等.采用时频坐标变换的大规模交直流系统多模态仿真方法[J].电力系统自动化,2020,44(5):130-137. DOI:10.7500/AEPS20190805005.
SONG Zhao,SHU Dewu,YAN Zheng,et al.Multi-domain Simulation Method for Large-scale AC/DC Systems Based on Time-Frequency Coordination Transform[J].Automation of Electric Power Systems,2020,44(5):130-137. DOI:10.7500/AEPS20190805005.

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历史
  • 收稿日期:2019-08-05
  • 最后修改日期:2019-11-05
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  • 在线发布日期: 2020-03-08
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