Modeling and Analysis of Transient Stability of UHV Half-wavelength and DC Hybrid Transmission System

ZHAO Qianyu; WANG Shouxiang; QIN Xiaohui; ZHANG Yantao; JIANG Yilang

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Modeling and Analysis of Transient Stability of UHV Half-wavelength and DC Hybrid Transmission System

更新时间：2025-12-08

- Modeling and Analysis of Transient Stability of UHV Half-wavelength and DC Hybrid Transmission System
- Vol. 44, Issue 1, Pages: 75-82(2018)
- 作者机构：
  
  1. 天津大学智能电网教育部重点实验室
  2. 中国电力科学研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 January 2018，
  
  Published：2018
- 稿件说明：
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ZHAO Qianyu, WANG Shouxiang, QIN Xiaohui, et al. Modeling and Analysis of Transient Stability of UHV Half-wavelength and DC Hybrid Transmission System[J]. 2018, 44(1): 75-82.
DOI：

ZHAO Qianyu, WANG Shouxiang, QIN Xiaohui, et al. Modeling and Analysis of Transient Stability of UHV Half-wavelength and DC Hybrid Transmission System[J]. 2018, 44(1): 75-82. DOI：

摘要

为研究特高压半波长与直流混联系统的暂态稳定性

根据半波长输电系统准稳态模型建立的特高压半波长与直流混联系统的稳定分析模型

分析了半波长输电线路的稳定运行区域

讨论了直流换相失败和直流闭锁时混联系统的功角稳定性;分别基于二阶系统的冲击响应模型和阶跃响应模型

揭示了直流换相失败和直流闭锁故障后的功率变化对半波长输电系统功率波动的影响机理;研究了利用直流输电系统传输功率的快速响应特性

采用直流功率调制对系统提供紧急功率支援

以提高含半波长互联系统的暂态稳定性的可行性。混联系统的机电暂态仿真验证了直流换相失败和直流闭锁故障对系统功率波动影响的分析方法的正确性以及直流输电系统对半波长线路提供紧急功率支援的有效性。研究表明:半波长线路功率波动峰值在系统直流换相失败时与振荡频率有关

而在闭锁故障时闭锁功率越少

阻尼越大

波动峰值越小;直流功率调制可提高异步联网系统的暂态稳定性。

Abstract

We established a model for the stability analysis of hybrid UHV half-wavelength and DC transmission system based on the quasi-steady model of half-wavelength transmission system.Moreover

we studied the stable operation range of the half wavelength transmission line

and discussed the power angle stability of the hybrid system during DC commutation failure and DC blocking.Meanwhile

we studied the power fluctuation mechanism of half-wavelength system caused by DC commutation failure and DC blocking based on shock response model and step response model of the two-order system

respectively

and studied the feasibility of emergency power support for the system to improve the transient stability of the half wavelength interconnected system by taking the advantage of fast power response of DC transmission system.The electromechanical transient simulation of UHV half wavelength and DC hybrid system proves the correctness of the methodology for the analysis of system power fluctuation caused by DC commutation failure and DC blocking

and also verifies the effectiveness of emergency power support of DC to half-wavelength transmission lines.The study shows that the peak of the power fluctuation of the half-wavelength line is related to the oscillation frequency during DC commutation failure.It also comes to the conclusion that the less the DC locking power is

the greater the damping and the smaller the peak value of the wave.And the DC power modulation can improve the transient stability of the asynchronous network system.

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