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基于时频坐标变换的大规模交直流系统多模态仿真方法
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上海交通大学

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国网上海市电力公司科技项目(52097018000D),上海市扬帆计划(19YF1423500)


Multi-domain Simulation Method for Large-scale AC/DC Grids Based on Time-Frequency Coordination Transform
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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。为解决该问题,本文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。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。该方法可以在保证精度的前提下采用更大的步长进行仿真,仿真效率明显改善。进一步,本文优化设计了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。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,采用国内实际某含有四端柔直系统的大规模交直流的案例测试证实了方法在仿真效率和精度上的优势。

    Abstract:

    In order to accurately simulate dynamics of large-scale AC/DC grids and interactions between individual components, a simulation method with high precision and efficiency is highly required. To revolve these issues, a multi-domain simulation method combining phasor- and time-domain models is proposed. In this method, the DC grids are partitioned into the phasor subsystem, which are presented by their phasor models. This method can adopt large time-step to improve the efficiency while the accuracy is guaranteed. Further, a multi-domain interface model between different subsystems is proposed. The interface model can reflect both instantaneous and wide-band phasor waveforms simultaneously. Finally, a practical AC/DC system integrating four terminal VSCs in China has validated the effectiveness of the proposed method.

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宋钊,舒德兀,严正,等.基于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. DOI:10.7500/AEPS20190805005.

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历史
  • 收稿日期:2019-08-05
  • 最后修改日期:2019-11-13
  • 录用日期:2019-11-07
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