含虚拟同步发电机的多端柔性直流系统稳定性分析

FU Qiang

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含虚拟同步发电机的多端柔性直流系统稳定性分析

更新时间：2025-08-13

- 含虚拟同步发电机的多端柔性直流系统稳定性分析
- Automation of Electric Power Systems Vol. 42, Issue 9, Pages: 164-170(2018)
- 作者机构：
  
  新能源电力系统国家重点实验室(华北电力大学),北京市,102206
- 作者简介：
- 基金信息：
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- Published：2018
- 稿件说明：
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FU Qiang. [J]. Automation of electric power systems, 2018, 42(9): 164-170.
DOI：

FU Qiang. [J]. Automation of electric power systems, 2018, 42(9): 164-170. DOI：

摘要

以含虚拟同步发电机(VSG)的多端柔性直流系统稳定性为研究对象，分别建立了VSG控制和矢量控制下电压源型换流器的传递函数模型，采用阻尼转矩分析法研究了VSG接入对直流系统自身稳定性的影响，得出如下结论:(1)“直流系统注入VSG的功率恒定”这一假设忽略了多端直流系统中VSG与剩余直流系统间的动态交互过程，导致其分析结果具有一定的局限性；(2)含VSG的多端直流系统自身会产生稳定性问题，受到VSG自身控制参数和VSG与剩余直流系统间动态交互过程的影响；(3)当VSG的开环模式与剩余直流系统中的开环模式接近时，直流系统可能产生振荡现象，文中给出了有效的参数调节方法。最后，对一个含VSG的三端柔性直流系统进行了时域仿真分析，验证了上述研究结果。

Abstract

The stability of multi-terminal flexible DC systems with virtual synchronous generators(VSG)is studied. Firstly

the transfer function models of voltage source converter(VSC)controlled by VSG or vector are developed respectively. Secondly

the influence of VSG access on the stability of multi-terminal DC(MTDC)system is analyzed by the damping torque method. Then the following conclusions are drew: 1)the assumption that “the power injected into VSG from the DC side is constant” ignores the dynamic interaction between the VSG and remaining DC system

which leads its results not to be general; 2)there are stability risks in MTDC system with VSGs

and the system is affected by the control parameters of VSG and the dynamic interaction between the VSG and remaining DC system; 3)the oscillations may happen in the MTDC system when the open-loop mode of VSG is close to the open-loop mode of the remaining DC system

thus this paper proposes an effective parameter adjustment method. Finally

the time-domain simulation analysis of a three-terminal flexible DC system with VSGs is carried out and the above results are verified.

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