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高压大容量直流变压器模块化离散解耦等效建模方法
作者:
作者单位:

1.清华大学电机工程与应用电子技术系;2.新能源电力系统国家重点实验室华北电力大学

摘要:

随着直流电网的快速发展,高压大容量直流变压器在可再生能源汇集与直流系统互联等能量变换环节中具有关键作用。为了在保持较低建模复杂度的同时保留详细模型的所有电气特性,本文提出了一种模块化离散解耦等效建模方法以实现高压大容量直流变压器的快速电磁暂态仿真分析。该方法通过引入受控源来传递二次信息以实现直流变压器子模块外部端口与内部端口的离散解耦,从而将系统中的高维度节点导纳矩阵转换为多个低维度的子系统进行同时求解以实现仿真提速。所提出的等效模型不仅建模方法简单且保留了详细模型所有电气特性,同时可以准确地仿真直流变压器系统的暂/稳态特性及一些特殊的运行工况,包括:预充电特性、直流短路故障及传输功率反转等,并显著地减小了仿真时间、提高了仿真效率。最后,通过PSCAD/EMTDC仿真分析验证了所提出的建模方法的正确性与有效性。

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基金项目:

xxx基金资助项目(基金编号); 国家电网公司科技项目(项目编号);已申请国家发明专利:申请号。

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作者简介:


Modular Discrete Decoupling Equivalent Modeling of High Voltage and Large Capacity DC Transformers
Author:
Affiliation:

1.Department of Electrical Engineering,Tsinghua University,Haidian District;2.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University,Changping District

Abstract:

With the rapid development of dc grid, high voltage and large capacity dc transformer (DCT) plays a key role in renewable energy collection and dc system interconnection. In order to realize fast electromagnetic transient equivalent modeling of DCTs including a large number of submodules (SMs) under the premise of low complexity and keeping all electrical characteristics of the detailed model, a modular discrete decoupling equivalent modeling method is proposed in this paper. In this method, the controlled source is introduced to transfer the secondary information and realize the discrete decoupling between the external port and internal port in the sub module of DCT. Thus, the high-dimensional admittance matrix of the system is divided into the low dimensional matrix and solved at the same time to realize the simulation speed-up. The proposed equivalent model not only has a simple modeling process, but also retains all the electrical characteristics of the detailed model. At the same time, it can accurately simulate the transient/steady-state characteristics of DCT system and some special operating conditions, including pre-charging characteristics, dc short-circuit fault and power reversal, and significantly reduces the simulation time and improves the simulation efficiency. Finally, the correctness and effectiveness of the proposed method are verified by PSCAD/EMTDC simulation analysis.

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Foundation:
引用本文
[1]安峰,崔彬,白睿航,等.高压大容量直流变压器模块化离散解耦等效建模方法[J/OL].电力系统自动化,http://doi. org/10.7500/AEPS20200708004.
AN Feng, CUI Bin, BAI Ruihang, et al. Modular Discrete Decoupling Equivalent Modeling of High Voltage and Large Capacity DC Transformers[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20200708004.
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  • 收稿日期:2020-07-08
  • 最后修改日期:2021-01-08
  • 录用日期:2020-12-08
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