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Multi-domain Simulation Method for Large-scale AC/DC Systems Based on Time-Frequency Coordination Transform
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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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    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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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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History
  • Received:August 05,2019
  • Revised:November 05,2019
  • Adopted:
  • Online: March 08,2020
  • Published: